Abstract

A headphone is provided. The headphone includes a housing, a first speaker and a second speaker. The housing includes a sound output side, a first layer structure, a first output path, a first trench, a first recess, and a second recess. The first speaker is disposed in the first recess, wherein the first speaker includes a first speaker orientation, and the first speaker orientation corresponds to the first output path. The second speaker is disposed in the second recess. The first output path includes the first trench, which is located at the first layer structure, that extends around the first speaker, and is connected to the sound output side.

IPC Classes  ?

• H04R 3/14 - Cross-over networks
• H04R 1/26 - Spatial arrangement of separate transducers responsive to two or more frequency ranges
• H04R 1/10 - Earpieces; Attachments therefor
• H04R 1/32 - Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
• H04R 1/24 - Structural combinations of separate transducers or of parts of the same transducer and responsive respectively to two or more frequency ranges
• H04R 1/28 - Transducer mountings or enclosures designed for specific frequency response; Transducer enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
• H04R 5/033 - Headphones for stereophonic communication

Abstract

A headphone is provided. The headphone includes a housing and an speaker. The housing includes a first layer structure, a first receiving space, a first output path, a first trench and a sound output side. The speaker is located in the first receiving space, wherein the speaker includes a first speaker orientation, and the first speaker orientation corresponds to the first output path. The first output path includes the first trench, which is located at the first layer structure, extends around the speaker, and is connected to the sound output side.

IPC Classes  ?

• H04R 1/26 - Spatial arrangement of separate transducers responsive to two or more frequency ranges
• H04R 1/10 - Earpieces; Attachments therefor
• H04R 1/32 - Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
• H04R 1/28 - Transducer mountings or enclosures designed for specific frequency response; Transducer enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
• H04R 5/033 - Headphones for stereophonic communication

Abstract

A rotating cylinder device includes a cylindrical belt having an axis line, several plate-shaped parts, several link mechanisms, and a cylindrical casing. The plate-shaped parts are disposed outside the belt and arranged symmetrically across the axis line. The link mechanisms are pivotally connected to the respective plate-shaped parts and each have a moving protrusion. The moving protrusions are adapted to move along a first direction parallel to the axis line. The cylindrical casing is adapted to rotate about the axis line and is coupled to the moving protrusions. When the cylindrical casing rotates about the axis line, the moving protrusions are driven to move along the first direction, and the plate-shaped parts are driven by the link mechanisms to move along a second direction perpendicular to the axis line, to contract the belt.

IPC Classes  ?

• F16H 37/12 - Gearings comprising primarily toothed or friction gearing, links or levers, and cams, or members of at least two of these three types
• A61B 5/00 - Measuring for diagnostic purposes ; Identification of persons
• A61B 5/021 - Measuring pressure in heart or blood vessels
• A61B 5/022 - Measuring pressure in heart or blood vessels by applying pressure to close blood vessels, e.g. against the skin; Ophthaldynamometers
• F16H 19/00 - Gearings comprising essentially only toothed gears or friction members and not capable of conveying indefinitely-continuing rotary motion
• F16H 21/54 - Gearings comprising primarily only links or levers, with or without slides with movements in three dimensions for conveying or interconverting oscillating or reciprocating motions
• F16H 25/18 - Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions

Abstract

A sight capable of measuring distance comprises a telescope without any turrets, a laser transmitting module, a mount for adjusting elevation and windage and a power supply. The telescope comprises a barrel, an unadjustable reticle fixed in the barrel and a laser receiving module fixed in the barrel. The laser transmitting module is steadfastly fixed on the outer barrel of the telescope and emitting a laser beam toward the target. The mount for adjusting elevation and windage is fixed on a lower side of the outer barrel of telescope, and comprises a mounting part, an elevation adjusting part and a windage adjusting part. The power supply electrically connects to the laser transmitting module and the laser receiving module.

IPC Classes  ?

• F41G 1/35 - Night sights, e.g. luminescent combined with light source, e.g. spot light for illuminating the target
• F41G 3/06 - Aiming or laying means with rangefinder
• F41G 1/387 - Mounting telescopic sights on smallarms
• F41G 1/473 - Sighting devices for particular applications for lead-indicating or range-finding, e.g. for use with rifles or shotguns
• F41G 11/00 - WEAPON SIGHTS; AIMING - Details of sighting or aiming apparatus; Accessories

Abstract

A binoculars rangefinder includes a central shaft, two eyepieces, two objective lenses, two prism modules, an optical transmitter, and an optical receiver. The eyepieces are disposed on two sides of the central shaft, allowing a first light beam reflected by an object to pass therethrough. The objective lenses are disposed on the two sides of the central shaft. The prism modules are disposed between the eyepieces and objective lenses. The optical transmitter is configured to emit a second light beam to the object. The optical receiver is configured to receive the second beam which is reflected by the object.

IPC Classes  ?

• G01C 3/04 - Adaptation of rangefinders for combination with telescopes or binoculars
• G01S 7/481 - Constructional features, e.g. arrangements of optical elements
• G01S 17/08 - Systems determining position data of a target for measuring distance only
• G02B 23/14 - Viewfinders

Abstract

An optical mechanism includes a bracket, a first polarization beam splitter, a second polarization beam splitter, a plurality of panels and a plurality of lenses. The first polarization beam splitter and the second polarization beam splitter are joined to the bracket. Light passes through the first polarization beam splitter to reach the panels and is reflected by the panels to generate image beams. The image beams are reflected by the first polarization beam splitter to enter the second polarization beam splitter. The image beams are reflected by a splitting surface of the second polarization beam splitter to pass through the lenses and projected by the lenses.

IPC Classes  ?

• G02B 27/28 - Optical systems or apparatus not provided for by any of the groups , for polarising
• G03B 21/28 - Reflectors in projection beam
• G02B 27/01 - Head-up displays
• G03B 21/20 - Lamp housings
• G03B 35/20 - Stereoscopic photography by simultaneous viewing using two or more projectors

Abstract

r is a lateral magnification of the lenses in the rear lens group except for the lenses in front of the image correction lens when the zoom lens is at the telephoto end.

IPC Classes  ?

• G02B 27/64 - Imaging systems using optical elements for stabilisation of the lateral and angular position of the image
• G02B 15/173 - Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses arranged + – +

Abstract

A lens assembly includes a first lens group, a stop and a second lens group, all of which are arranged in sequence from an object side to an image side along an optical axis. The first lens group includes a first lens and a second lens, wherein the first lens is with negative refractive power and the second lens is with positive refractive power. The second lens group includes a third lens, a fourth lens, a fifth lens and a sixth lens, wherein the third lens and the fifth lens are with negative refractive power, and the fourth lens and the sixth lens are with positive refractive power. The lens assembly satisfies 0.23≦f/TL≦0.45, wherein f is an effective focal length of the lens assembly and TL is a distance from an object side surface of the first lens to an image plane along the optical axis.

IPC Classes  ?

• G02B 9/60 - Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or – having five components only
• G02B 13/00 - Optical objectives specially designed for the purposes specified below
• G03B 19/12 - Reflex cameras with single objective and a movable reflector or a partly-transmitting mirror
• G02B 15/14 - Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective

Abstract

5 is an Abbe number of the fifth lens.

IPC Classes  ?

• G02B 13/04 - Reversed telephoto objectives
• G02B 9/60 - Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or – having five components only

Abstract

A lens module includes a driving device, an image sensing device, a lens group frame, and an infrared filter. The driving device has a lens barrel for an optical signal passing through. The image sensing device is on a path of the optical signal to convert the optical signal into an electric signal. The lens group frame is provided in the lens barrel, and has a main body, which is driven by the driving device to be moved between a first position and a second position, and a lens holder, which is pivotally connected on the main body and is swung between a third position and a fourth position when the main body is respectively at the first and the second positions. The infrared filter is provided on the lens holder, and is precisely aligned with the image sensing device when the lens holder is at the fourth position.

IPC Classes  ?

• G02B 7/10 - Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens
• G03B 7/10 - Control effected solely on the basis of the response, to the intensity of the light received by the camera, of a built-in light-sensitive device a servo-motor providing energy to move the setting member
• G02B 7/04 - Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
• G02B 7/00 - Mountings, adjusting means, or light-tight connections, for optical elements

Abstract

A lens assembly includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens. The first lens is with positive refractive power. The second lens is with negative refractive power. The third lens is with positive refractive power. The fourth lens is a meniscus lens and includes a concave surface facing the object side and a convex surface facing the image side. The fifth lens includes a concave surface facing the image side. The first lens and the third lens are made of the same material and an Abbe number of the first lens is the same as an Abbe number of the third lens. An Abbe number of the first lens, an Abbe number of the third lens and an Abbe number of the fifth lens are greater than an Abbe number of the second lens.

IPC Classes  ?

• G02B 3/02 - Simple or compound lenses with non-spherical faces
• G02B 13/18 - Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
• G02B 13/00 - Optical objectives specially designed for the purposes specified below
• G02B 9/60 - Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or – having five components only

Abstract

A wide-angle lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, all of which are arranged in sequence from an object side to an image side along an optical axis. The first lens is with negative refractive power and includes a convex surface facing the object side. The second lens includes a convex surface facing the object side. The third lens is a biconvex lens. The fourth lens is a biconvex lens. The fifth lens is a biconcave lens. The sixth lens is a biconvex lens. The fourth lens and the fifth lens are cemented together to form a cemented lens.

IPC Classes  ?

• G02B 9/62 - Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or – having six components only
• G02B 13/00 - Optical objectives specially designed for the purposes specified below
• G02B 13/06 - Panoramic objectives; So-called "sky lenses"
• G02B 9/60 - Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or – having five components only

Abstract

A lens assembly includes a fifth lens, a first lens, a second lens, a third lens and a fourth lens, all of which are arranged in sequence from an object side to an image side along an optical axis. The second lens is a biconcave lens. The third lens is a biconvex lens and made of glass material. The fourth lens includes a concave surface facing the object side.

IPC Classes  ?

• G02B 3/02 - Simple or compound lenses with non-spherical faces
• G02B 13/18 - Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
• G02B 9/60 - Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or – having five components only
• G02B 13/00 - Optical objectives specially designed for the purposes specified below

Abstract

A zoom lens includes a driving device, a zooming frame, and a lens group, wherein the driving device has a lens barrel. The zooming frame is located in the lens barrel, and has a body, a first lens holder, and a second lens holder which are pivotally connected to the body. The body is drivable by the driving device to reciprocally move between a first position and a second position. The first lens holder is respectively pivoted between a third position and a fourth position on the body along with the body being moved between the first position and the second position. The second lens holder is pivoted between a fifth position and a sixth position on the body in the same way. The lens group has a first lens sub-group provided on the first lens holder, and a second lens sub-group provided on the second lens holder.

IPC Classes  ?

• G02B 15/14 - Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
• G02B 7/10 - Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens
• G02B 13/00 - Optical objectives specially designed for the purposes specified below

Abstract

A near infrared lens assembly includes a first lens, a second lens, a third lens and a fourth lens, all of which are arranged in sequence from an object side to an image side along an optical axis. The first lens is with positive refractive power and includes a convex surface facing the object side. The second lens is a meniscus lens and includes a convex surface facing the object side and a concave surface facing the image side. The third lens is a meniscus lens and includes a concave surface facing the object side and a convex surface facing the image side. The fourth lens is with negative refractive power and includes a concave surface facing the object side.

IPC Classes  ?

• G02B 13/00 - Optical objectives specially designed for the purposes specified below
• G02B 9/34 - Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or – having four components only

Abstract

A lens assembly includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, all of which are arranged in sequence from an object side to an image side along an optical axis. The first lens is a biconvex lens with positive refractive power. The second lens is a meniscus lens with negative refractive power. The third lens is with positive refractive power and includes a convex surface facing the image side. The fourth lens is a meniscus lens with negative refractive power. The fifth lens is a meniscus lens with negative refractive power. The sixth lens is a meniscus lens with positive refractive power.

IPC Classes  ?

• G02B 9/62 - Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or – having six components only
• G02B 13/00 - Optical objectives specially designed for the purposes specified below

Abstract

An optical device includes a base; an image sensor disposed on the base; an outer frame connected to the base and having a flat surface; an inner frame having a protrusion and movable between a first position and a second position with respect to the base; and a lens group disposed on the inner frame and having an optical axis, wherein the protrusion abuts the flat surface and the optical axis extends through the image sensor when the inner frame moves to the first position, and the inner frame is accommodated in a space when the inner frame moves to the second position.

IPC Classes  ?

• H04N 5/225 - Television cameras

Abstract

A sight and methods of operation thereof are provided. In some embodiments, an image is captured via an image capture unit, and a center position is calculated according to the positions of at least three impact points in the image, and a predefined view center of a display unit is set to the center position. In some embodiments, an angle of dip of the sight to a plane is detected via a dip angle detector. A predictive impact point is calculated according to the angle of dip and at least one calculation parameter, and an impact point indication is accordingly displayed in the display unit. When the angle of dip is changed, the predictive impact point is recalculated according to the new angle of dip, and the corresponding impact point indication is displayed.

IPC Classes  ?

• G06F 19/00 - Digital computing or data processing equipment or methods, specially adapted for specific applications (specially adapted for specific functions G06F 17/00;data processing systems or methods specially adapted for administrative, commercial, financial, managerial, supervisory or forecasting purposes G06Q;healthcare informatics G16H)
• G06G 7/80 - Analogue computers for specific processes, systems, or devices, e.g. simulators for guiding missiles
• F41G 3/06 - Aiming or laying means with rangefinder
• F41G 1/00 - Sighting devices
• F41G 1/40 - Periscopic sights specially adapted for smallarms or ordnance; Supports or mountings therefor
• F41G 1/473 - Sighting devices for particular applications for lead-indicating or range-finding, e.g. for use with rifles or shotguns
• F41G 3/08 - Aiming or laying means with means for compensating for speed, direction, temperature, pressure, or humidity of the atmosphere
• F41G 3/14 - Indirect aiming means
• F41G 3/00 - Aiming or laying means

Abstract

A prism assembly includes a first prism, a second prism, a roof prism and an optical multilayer film. The first prism includes a first, a second and a third surface. The second prism includes a fourth, a fifth and a sixth surface. The fifth surface faces the third surface. The roof prism includes a seventh, an eighth and a ridge surface. The seventh surface faces the second surface. The optical multilayer film is disposed between the fifth surface and the third surface. A first light beam and a second light beam entering the first prism are totally reflected from the second surface to the optical multilayer film which reflects the first light beam but allows the second light beam to pass through. The second light beam enters the second prism, is totally reflected on the sixth surface, and exits from the fourth surface of the second prism.

IPC Classes  ?

• G02B 5/04 - Prisms
• G01C 3/08 - Use of electric radiation detectors
• G01S 7/481 - Constructional features, e.g. arrangements of optical elements
• G01S 17/08 - Systems determining position data of a target for measuring distance only

Abstract

A sight includes a power-changed unit and a bullet impact correction unit. The power-changed unit includes an outer barrel, a rotary frame disposed around the outer barrel, a frame screw disposed in the rotary frame, and a resilient member disposed between the outer barrel and the frame screw. The bullet impact correction unit includes an elevation adjustment screw and a windage adjustment screw, both of which abut the power-changed unit.

IPC Classes  ?

• F41G 1/26 - Adjusting mechanisms therefor; Mountings therefor screw

Abstract

In an optical device, a first spring connects a first lens frame and a second lens frame for exerting a spring force thereon so that first pins of the first lens frame and second pins of the second lens frame abut a first cam groove and a second cam groove of a cam barrel respectively. A second spring connects the second lens frame and a third lens frame for exerting a spring force thereon so that the second pins of the second lens frame and third pins of the third lens frame abut the second cam groove and a third cam groove of the cam barrel respectively. The first spring may be a compression spring, and the second spring may be an extension spring.

IPC Classes  ?

• G02B 7/02 - Mountings, adjusting means, or light-tight connections, for optical elements for lenses
• G02B 7/04 - Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
• G02B 7/10 - Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens

Abstract

A sight includes a cylinder, a first lens, a first lens seat, and at least one first elastic member. The first lens is disposed in the cylinder. The first lens seat carrying the first lens is disposed in the cylinder. The first elastic member is disposed between an outer surface of the first lens seat and an inner periphery of the cylinder, wherein the first lens seat is tightly fitted with the cylinder and light enters the cylinder through the first lens.

IPC Classes  ?

• G02B 7/02 - Mountings, adjusting means, or light-tight connections, for optical elements for lenses
• G02B 23/16 - Housings; Caps; Mountings; Supports, e.g. with counterweight
• F41G 1/027 - Foresights with lens
• F41G 1/14 - Rearsights with lens
• F41G 1/38 - Telescopic sights specially adapted for smallarms or ordnance; Supports or mountings therefor

Abstract

A miniaturized lens assembly includes a first lens, a second lens and a third lens, all of which are arranged in sequence from an object side to an image side along an optical axis. The first lens is a convex-concave lens with negative refractive power and includes a convex surface facing the object side and a concave surface facing the image side. The second lens is with positive refractive power. The third lens is a convex-concave lens with negative refractive power and includes a convex surface facing the object side and a concave surface facing the image side.

IPC Classes  ?

• G02B 3/02 - Simple or compound lenses with non-spherical faces
• G02B 13/00 - Optical objectives specially designed for the purposes specified below

Abstract

An optical device includes a first lens frame bearing a first lens set and having a plurality of rods, a first cam barrel rotating to move the first lens frame along a first axis, a second lens frame bearing a second lens set and having a plurality of holes corresponding to the rods, and a second cam barrel rotatably disposed around the first cam barrel to rotate the first cam barrel and move the second lens frame along a second axis parallel to the first axis, wherein the first axis is substantially coincident with the second axis with the rods inserted into the holes.

IPC Classes  ?

• G02B 15/14 - Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
• G02B 7/10 - Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens
• H04N 5/225 - Television cameras

Abstract

A cam frame of a zoom lens is provided. The cam frame includes an end surface, a first cam groove including a first connecting portion, a second connecting portion and a zooming-collapsing operation portion connected between the first connecting portion and the second connecting portion, an introducing groove connecting the end surface and the first connecting portion, a second cam groove, and a first connecting groove connecting the second connecting portion and the second cam groove.

IPC Classes  ?

• G02B 15/14 - Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
• G02B 7/10 - Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens

Abstract

A wide-angle lens includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens, all of which are arranged in sequence from an object side to an image side along an optical axis. The first lens is with negative refractive power and includes a concave surface facing the image side. The second lens is a biconcave lens with negative refractive power. The third lens is a biconvex lens with positive refractive power. The fourth lens is a biconvex lens with positive refractive power. The fifth lens is with negative refractive power and includes a concave surface facing the object side.

IPC Classes  ?

• G02B 9/60 - Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or – having five components only
• G02B 13/18 - Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
• G02B 13/00 - Optical objectives specially designed for the purposes specified below
• G02B 13/04 - Reversed telephoto objectives

Abstract

An image reading device for reading an image of an object includes a multi-color light source which projects light rays with at least three colors onto the object, at least three monochrome image sensor rows, and at least a lens row provided between the object and the monochrome image sensor rows, wherein reflected light rays are imaged directly onto the monochrome image sensor rows through the lens row, and wherein switching between any two colors occurs only once every time the multi-color light source, the image sensor rows, and the lens row are moved for a predetermined distance. The image reading device is able to read color and monochrome images.

IPC Classes  ?

• H04N 1/46 - Colour picture communication systems
• H04N 1/04 - Scanning arrangements
• H04N 1/48 - Picture signal generators

Abstract

32 is a radius of curvature of an image side surface of the third lens.

IPC Classes  ?

• G02B 15/177 - Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a negative front lens or group of lenses
• G02B 13/00 - Optical objectives specially designed for the purposes specified below
• G02B 15/20 - Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having an additional movable lens or lens group for varying the objective focal length

Abstract

6 is an effective focal length of the sixth lens group.

IPC Classes  ?

• G02B 15/14 - Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
• G02B 15/173 - Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses arranged + – +

Abstract

A zoom lens includes an external frame, a rotary shaft, an internal frame, a lens group and a spring. The internal frame is connected to the external frame via the rotary shaft, so that the internal frame is rotatable relative to the external frame. The lens group is fixed in the internal frame. The spring comprises a deformation part and two extension parts extended from the deformation part, wherein one extension part is propped against the internal frame and inclined at an acute angle relative to the rotary shaft, and the other extension part is propped against the external frame.

IPC Classes  ?

• G02B 7/04 - Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
• G02B 15/14 - Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
• G02B 7/10 - Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens
• G02B 7/02 - Mountings, adjusting means, or light-tight connections, for optical elements for lenses

Abstract

1 is an effective focal length of the first lens.

IPC Classes  ?

• G02B 15/14 - Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
• G02B 15/173 - Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses arranged + – +

Abstract

A sight and methods of operation thereof are provided. In some embodiments, an image is captured via an image capture unit, and a center position is calculated according to the positions of at least three impact points in the image, and a predefined view center of a display unit is set to the center position. In some embodiments, an angle of dip of the sight to a plane is detected via a dip angle detector. A predictive impact point is calculated according to the angle of dip and at least one calculation parameter, and an impact point indication is accordingly displayed in the display unit. When the angle of dip is changed, the predictive impact point is recalculated according to the new angle of dip, and the corresponding impact point indication is displayed.

IPC Classes  ?

• G06F 19/00 - Digital computing or data processing equipment or methods, specially adapted for specific applications (specially adapted for specific functions G06F 17/00;data processing systems or methods specially adapted for administrative, commercial, financial, managerial, supervisory or forecasting purposes G06Q;healthcare informatics G16H)
• G06G 7/80 - Analogue computers for specific processes, systems, or devices, e.g. simulators for guiding missiles
• F41G 1/00 - Sighting devices
• F41G 1/40 - Periscopic sights specially adapted for smallarms or ordnance; Supports or mountings therefor
• F41G 1/473 - Sighting devices for particular applications for lead-indicating or range-finding, e.g. for use with rifles or shotguns

Abstract

345 is the effective focal length of the combination of the third lens, the fourth lens and the fifth lens.

IPC Classes  ?

• G02B 9/60 - Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or – having five components only
• G02B 13/00 - Optical objectives specially designed for the purposes specified below
• G02B 13/18 - Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration

Abstract

A zoom lens includes a first lens group, a second lens group, a third lens group and a fourth lens group, all of which are arranged in sequence from an object side to an image side along an optical axis. The first lens group is with positive refractive power and includes a first lens that is with negative refractive power and a second lens that is with positive refractive power. The second lens group is with negative refractive power. The third lens group is with positive refractive power and includes a third lens front group that is with positive refractive power and a third lens rear group that is with positive refractive power. The fourth lens group is with positive refractive power.

IPC Classes  ?

• G02B 15/14 - Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective

Abstract

A projection lens includes a first lens group, a second lens group and a third lens group, all of which are arranged in sequence from an projection side to an image source side along an optical axis. The first lens group is with negative refractive power and includes four lenses. The second lens group is with positive refractive power and includes two lenses. The third lens group is with positive refractive power and includes a stop and six lenses.

IPC Classes  ?

• G02B 3/02 - Simple or compound lenses with non-spherical faces
• G02B 13/04 - Reversed telephoto objectives

Abstract

An optical coupling device includes an optical coupling member, an optical-electrical converting module, and at least two optical fibers. The optical coupling member has a first under positioning portion. The optical-electrical converting module has a substrate, a base, an optical signal transmitter, and an optical signal receiver. The base is made of an insulating material and is provided on the substrate. The base has a receiving portion and a second under positioning portion to engage the first under positioning portion. The optical signal transmitter and the optical signal receiver are receiving in the receiving portion and face the first lens portion when the second under positioning portion engages the first under positioning portion. The optical fibers are beside the optical coupling member and face the second lens portion.

IPC Classes  ?

• G02B 6/36 - Mechanical coupling means
• G02B 6/32 - Optical coupling means having lens focusing means
• G02B 6/42 - Coupling light guides with opto-electronic elements

Abstract

A lens assembly includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens, all of which are arranged in sequence from an object side to an image side along an optical axis. The first lens is with positive refractive power and includes a convex surface facing the object side. The second lens is a meniscus lens with negative refractive power and includes a convex surface facing the object side. The third lens is with positive refractive power and includes a convex surface facing the image side. The fourth lens is with positive refractive power and includes a convex surface facing the image side. The fifth lens is a biconcave lens with negative refractive power.

IPC Classes  ?

• G02B 13/00 - Optical objectives specially designed for the purposes specified below

Abstract

A slim lens assembly includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens, all of which are arranged in sequence from an object side to an image side along an optical axis. The first lens is a convex-concave lens with negative refractive power and includes a convex surface facing the object side and a concave surface facing the image side. The second lens is with positive refractive power. The third lens is a biconcave lens with negative refractive power. The fourth lens is a biconvex lens with positive refractive power. The fifth lens is a convex-concave lens with negative refractive power and includes a convex surface facing the object side and a concave surface facing the image side.

IPC Classes  ?

• G02B 3/02 - Simple or compound lenses with non-spherical faces
• G02B 13/04 - Reversed telephoto objectives
• G02B 3/04 - Simple or compound lenses with non-spherical faces with continuous faces that are rotationally symmetrical but deviate from a true sphere
• G02B 3/00 - Simple or compound lenses
• G02B 9/60 - Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or – having five components only
• G02B 13/00 - Optical objectives specially designed for the purposes specified below
• G02B 13/18 - Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration

Abstract

A projector includes an illuminating system and an imaging system. The illuminating system includes a light source module, a lens array, a condenser lens and a display panel, in which light beams are generated by the light source module, uniformly dispersed by the lens array, condensed by the condenser lens, and reflected by the display panel to obtain image light, and the condenser lens has an effective focal length substantially equal to a product of an f-number of the illuminating system and a thickness of the lens array. The imaging system outwardly projects the image light.

IPC Classes  ?

• G03B 21/14 - Projectors or projection-type viewers; Accessories therefor - Details
• G02B 27/09 - Beam shaping, e.g. changing the cross-sectioned area, not otherwise provided for
• G03B 21/20 - Lamp housings
• G03B 33/12 - Simultaneous recording or projection using beam-splitting or beam-combining systems, e.g. dichroic mirrors
• H04N 9/31 - Projection devices for colour picture display

Abstract

A projector includes a polarization conversion system and a reflective polarizer. The polarization conversion system receives unpolarized light including first S-polarized light and first P-polarized light, wherein the first S-polarized light passes through the polarization conversion system, a part of the first P-polarized light is converted into second S-polarized light after passing through the polarization conversion system, and another part of the first P-polarized light remains unchanged after passing through the polarization conversion system. The reflective polarizer allows the first S-polarized light and the second S-polarized light to pass through and reflects the first P-polarized light back to the polarization conversion system.

IPC Classes  ?

• H04N 9/31 - Projection devices for colour picture display
• G03B 21/20 - Lamp housings
• G02F 1/1335 - Structural association of cells with optical devices, e.g. polarisers or reflectors
• G02F 1/13 - Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
• G02B 27/28 - Optical systems or apparatus not provided for by any of the groups , for polarising
• G03B 21/14 - Projectors or projection-type viewers; Accessories therefor - Details

Abstract

A lens device includes a first barrel surrounding an optical axis, a first frame coupled rotatably to the first barrel and surrounding a first axis, and an adjusting unit. The adjusting unit has an adjusting groove formed in one of the first barrel and the first frame, and having adjusting groove segments, one of which extends spirally. The adjusting unit further has adjusting blocks formed on the other one of the first barrel and the first frame and engaging respectively and slidably the adjusting grooves. The first frame is rotatable relative to the first barrel to adjust the first axis relative to the optical axis.

IPC Classes  ?

• G02B 15/14 - Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
• G02B 7/02 - Mountings, adjusting means, or light-tight connections, for optical elements for lenses

Abstract

An imaging lens including the first˜fifth lens arranged in sequence from an object side to an image side is provided. The first lens has at least one aspheric surface. The second lens with negative optical power has at least one aspheric surface and a convex surface facing towards the object side. The third lens with positive optical power has at least one aspheric surface and a concave surface facing towards the object side. The fourth lens with negative optical power has at least one aspheric surface and a concave surface facing towards the image side. The fifth lens with positive optical power has at least one aspheric surface and a convex surface facing towards the object side. By the above arrangement, the imaging lens has a shorter optical total length and a larger aperture for enhancing the image quality.

IPC Classes  ?

• G02B 13/18 - Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
• G02B 13/00 - Optical objectives specially designed for the purposes specified below

Abstract

A distance measurement method is provided that includes the steps of transmitting a laser signal to a target, receiving outside signals reflected by the target, converting the outside signals into an analog voltage signal, sampling the analogy voltage signal to obtain digital signals, storing the digital signals at storage addresses in a one-to-one relationship, repeating the above steps, accumulating numeral values at each storage addresses to obtain an accumulated value, outputting the accumulating value which exceeds a constant and corresponds to a time point, and calculating the distance between a laser range finding device and the target according to the time point corresponding to the output accumulated value.

IPC Classes  ?

• G01C 3/08 - Use of electric radiation detectors
• G01S 7/487 - Extracting wanted echo signals

Abstract

A positionable mechanism includes a frame unit, an OIS unit, and a positioning unit that are mounted on a base unit. The frame unit is retractable with respect to the base unit between a storage position and a working position. The positioning unit is movable with respect to the OIS unit between an abutting position and a releasing position, and is subjected to a restoring force. When the frame unit is at the storage position, a pressing part of the frame unit presses the positioning unit to the abutting position where the positioning unit abuts against a movable carrier of the OIS unit. When the frame unit is at the working position, the positioning unit is restored to the releasing position and releases the movable carrier.

IPC Classes  ?

• H04N 5/225 - Television cameras
• H04N 5/228 - Circuit details for pick-up tubes

Abstract

A lens assembly includes a base frame, an image sensor, a lens barrel, a lens and a backoff mechanism. By means of the backoff mechanism, the image sensor is mounted at the base frame and movable between an operative position and a non-operative backoff position. When the image sensor is in the operative position, the lens barrel is in a first position far frame the base frame, and the optical axis of the lens intersects the image sensor. When the lens barrel is moved to a second position close to the base frame, the image sensor is moved to the non-operative backoff position, and the optical axis of the lens is not intersected with the image sensor.

IPC Classes  ?

• H04N 5/225 - Television cameras
• G03B 17/04 - Bodies collapsible, foldable or extensible, e.g. book type

Abstract

A single piece light guide is disclosed herein. The single piece light guide may include a light rod and a lens. The single piece light guide may be formed using injection molding. The light guide may have one or more regions between the light rod and the lens. A housing may be provided for the light guide. The housing may have an opening that physically supports the light rod. Therefore, the light rod may be secured into place, which may prevent misalignment during use. The one or more regions between the light rod and the lens may assist in assembling and holding the light guide in the housing.

IPC Classes  ?

• F21V 5/00 - Refractors for light sources

Abstract

A single piece light guide is disclosed herein. The single piece light guide may include a light rod and a lens. The single piece light guide may be formed using injection molding. The light guide may have one or more regions between the light rod and the lens. A housing may be provided for the light guide. The housing may have an opening that physically supports the light rod. Therefore, the light rod may be secured into place, which may prevent misalignment during use. The one or more regions between the light rod and the lens may assist in assembling and holding the light guide in the housing.

IPC Classes  ?

• F21V 7/04 - Optical design
• G03B 21/20 - Lamp housings
• F21V 8/00 - Use of light guides, e.g. fibre optic devices, in lighting devices or systems

Abstract

A single piece light guide is disclosed herein. The single piece light guide may include a light rod and a lens. The single piece light guide may be formed using injection molding. The light guide may have one or more regions between the light rod and the lens. A housing may be provided for the light guide. The housing may have an opening that physically supports the light rod. Therefore, the light rod may be secured into place, which may prevent misalignment during use. The one or more regions between the light rod and the lens may assist in assembling and holding the light guide in the housing.

IPC Classes  ?

• F21V 5/00 - Refractors for light sources
• F21V 17/00 - Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages

Abstract

A beam combiner includes a first lens and a second lens coated with specific optical films. The first color light beam enters the first lens via a first incidence surface with an incidence angle of Brewster's angle. The second color light beam enters the first lens via the second incidence surface with an incidence angle of zero degree. The third color light beam enters the second lens via the third incidence surface with an incidence angle of zero degree. The first, the second, and the third color light beams transmit in the same path after the splitting face to form the composite light beam and come out via an exit surface.

IPC Classes  ?

• G02B 27/14 - Beam splitting or combining systems operating by reflection only

Abstract

A zoom lens includes a first lens group, a second lens group, an aperture, a third lens group, a fourth lens group, a fifth lens group, and an image surface in order along an optical axis from an object side to an image side. The first lens group has positive refractive power, and includes three lenses. The second lens group has negative refractive power, and includes fourth lenses. The third lens group has positive refractive power, and includes two lenses. The fourth lens group has positive refractive power, and includes five lenses. The fifth lens group has positive refractive power, and includes two lenses. Therefore, the zoom lens has a small size and high zoom ratio.

IPC Classes  ?

• G02B 15/14 - Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective

Abstract

An optical sight of the present invention may aim at an object via a cross. The optical sight has a focusing adjuster for focusing and a brightness adjuster for adjusting luminance on a cross. The focusing adjuster and the brightness adjuster are made at the same position that user may operate the optical sight more conveniently.

IPC Classes  ?

• F21V 33/00 - Structural combinations of lighting devices with other articles, not otherwise provided for
• G02B 23/00 - Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices

Abstract

A miniature image pickup lens includes a first lens, a second lens, a third lens, an aperture, a fourth lens, and a fifth lens in sequence along an optical axis from an object side to an image side. The first lens is a meniscus lens with negative refractive power and has a convex side facing the object side. The first lens has at least an aspheric side. The second lens is a biconvex lens with positive refractive power. The third lens is a biconcave lens with negative refractive power. The fourth lens is a biconvex lens with positive refractive power and has at least an aspheric side. The fifth lens has a negative refractive power.

IPC Classes  ?

• G02B 9/60 - Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or – having five components only
• G02B 3/02 - Simple or compound lenses with non-spherical faces
• G02B 9/34 - Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or – having four components only

Abstract

The present invention provides a projection prime lens including first lens group, a second lens group, and a third lens group arranged in sequence along an optical axis from a screen side to a light modulator side. The first lens group has negative refractive power and includes a first lens with negative refractive power and a second lens with negative refractive power. The second lens group has positive refractive power and includes a third lens with positive refractive power and a fourth lens with positive refractive power The third lens group has positive refractive power and includes a fifth lens with negative refractive power, a sixth lens with positive refractive power, and a seventh lens with positive refractive power. Therefore, the projection prime lens of the present invention has a small size and a good image quality.

IPC Classes  ?

• G02B 13/04 - Reversed telephoto objectives

Abstract

A zoom lens of the present invention includes a first lens group, a second lens group, an aperture, a third lens group, a fourth lens group, and an image surface in sequence along an optical axis from an object side to an image side. The first lens group has positive refractive power, and includes at least two lenses. The second lens group has negative refractive power, and includes three lenses. The third lens group has positive refractive power, and includes at least two lenses. The fourth lens group has positive refractive power. The zoom lens is switched to a telephoto mode from a wide-angle mode by moving the first lens group toward the object side, moving the second lens group toward the image side, and moving the third lens group toward the object side.

IPC Classes  ?

• G02B 15/14 - Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective

Abstract

The present invention provides a micro-projection lens including first lens group, a second lens group, and a third lens group arranged in sequence along an optical axis from a screen side to a light modulator side. The first lens group has positive refractive power and includes at least an aspheric lens. The second lens group has negative refractive power and includes at least a glass tablet. The third lens group has positive refractive power and includes at least an aspheric lens. Therefore, the micro-projection lens of the present invention has a small size and high optical performance.

IPC Classes  ?

• G02B 3/02 - Simple or compound lenses with non-spherical faces
• G02B 9/12 - Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or – having three components only

Abstract

A prism type of lens includes a first reflection lens, at least a first lens group, a second reflection prism, at least a second lens group, a third reflection prism, and at least a third lens group sequentially arranged from an object side to an image side. Light is reflected by the reflection prisms to form a bent light axis. Therefore, the optical axis has three sections for the lens groups to move respectively. The bent light axis has a longer distance that the lens of the present invention may have a great zoom range.

IPC Classes  ?

• G02B 15/14 - Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
• G02B 5/04 - Prisms

Abstract

A light source module of a projector includes a beam splitter, a red light source, a blue light source, and a blue light source. The beam splitter has a first reflection side, on which a first splitter film is provided, and a second reflection side, on which a second splitter film is provided. An angle between a normal line of the first reflection side, and a normal line of the second reflection side, is in a range between 165 degrees and 180 degrees. Both the first splitter film and the second splitter film permit red rays to pass therethrough. The red light source is separated from the blue and green light sources to obtain a better thermal dissipation.

IPC Classes  ?

• F21V 9/00 - Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters

Abstract

The present invention provides a laser rangefinder and a method of activating the laser rangefinder to measure distance. The laser rangefinder has a first sensing to sense whether the user is aiming the laser rangefinder at a target and a second sensing device to sense an acceleration of the laser rangefinder and the acceleration has to be smaller than a preset value. The laser rangefinder will be automatically activated to measure distance when both of the first sensing device and the second device are checked.

IPC Classes  ?

• G01C 3/08 - Use of electric radiation detectors

Abstract

A lens assembly includes a first lens and a second lens. The first lens includes a first inner end surface, a first outer end surface and slots. The slots formed on the first inner end surface extends toward the first outer end surface, and each slot includes a trough and an inner engaging side portion. The second lens includes a second inner end surface, a second outer end surface and engaging blocks. The engaging blocks formed on the second inner end surface extends toward the first inner end surface of the first lens, and each engaging block includes a crest portion disposed next to the first inner end surface of the first lens and an inner engaging protrusion. A slit is defined by the inner engaging side portion and the trough portion of the slot and the inner engaging protrusion and the crest portion of the engaging block.

IPC Classes  ?

• G02B 7/02 - Mountings, adjusting means, or light-tight connections, for optical elements for lenses

Abstract

A zoom projection lens includes a first lens set and a second lens set arranged in sequence from an object side to an image side of the zoom projection lens. The first lens set has a negative optical power. The second lens set has a positive optical power. The first lens set has a first lens. The second lens set has a second lens, a third lens, a fourth lens, and an aperture stop disposed between the second lens and the third lens. The first lens is an aspherical plastic lens. One of the third and fourth lenses is an aspherical glass lens. The zoom projection lens satisfies: 1.463<|tt/lt|<1.505, in which, tt represents an overall length of the zoom projection lens, and lt represents a length of the zoom projection lens from the object side of the first lens to an image side of the fourth lens.

IPC Classes  ?

• G02B 15/14 - Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
• G02B 15/177 - Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a negative front lens or group of lenses

Abstract

An optical sight includes an outer barrel unit, an objective lens unit, an ocular lens unit, a magnification unit, and an illumination unit. The outer barrel unit extends about an axis and has a front end and a rear end. The objective lens unit is mounted to the front end of the outer barrel unit and has a first optical axis. The ocular lens unit is mounted to the rear end of the outer barrel unit. The magnification unit is disposed in and on the outer barrel unit between the objective lens unit and the ocular lens unit, and has a second optical axis. The illumination unit is disposed on the magnification unit, and includes a light source spaced apart from the second optical axis, and a reflective element for projecting emitted light, which is emitted from the light source, onto the objective lens unit.

IPC Classes  ?

• G02B 23/00 - Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices

Abstract

W stands for the optical path length, and ID stands for the diameter of the image circle.

IPC Classes  ?

• G02B 15/14 - Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective

Abstract

An optical sight includes an outer barrel unit, an objective lens unit, an ocular lens unit, a magnification unit, amounting unit, and a range-finding module. The outer barrel unit extends about an axis and has a front end and a rear end. The objective lens unit is mounted to the front end of the outer barrel unit. The ocular lens unit is mounted to the rear end of the outer barrel unit. The magnification unit is disposed between the objective lens unit and the ocular lens unit. The mounting unit is disposed in the outer barrel unit between the objective lens unit and the magnification unit, and has an outer peripheral surface, and an inner passage extending along the axis. The range-finding module is disposed in the outer barrel unit, and includes a light emitter, a light receiver, and a circuit board unit.

IPC Classes  ?

• G01C 3/08 - Use of electric radiation detectors

Abstract

A rangefinder. A main body includes a first end and a second end opposite to the first end. The second end includes at least one guide bar. A receiving lens is connected to the first end of the main body. A first adjusting wheel and a second adjusting wheel are rotatably connected to the second end of the main body. A movable board is movably fit on the guide bar of the second end of the main body and is disposed between the first and second adjusting wheels. A receiving member is connected to the movable board, receiving light beams received by the receiving lens. The movable board is moved by rotation of the first and second adjusting wheels, driving the receiving member to move on an optical axis.

IPC Classes  ?

• G01C 3/08 - Use of electric radiation detectors

Abstract

A reflex sight is provided, including a first lens module, a first light source, and a second light source. The first light source projects a first reticle image to the first lens module, and the first lens module reflects the first reticle image to a viewer. When the first light source is inactive, the second light source projects a second reticle image to the first lens module, and the first lens module reflects the second reticle image to the viewer.

IPC Classes  ?

• G02B 27/10 - Beam splitting or combining systems
• G02B 23/10 - Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices involving prisms or mirrors reflecting into the field of view additional indications, e.g. from collimator

Abstract

An optical sight includes a main barrel unit, an objective lens unit, an ocular lens unit, and a magnification unit. The main barrel unit extends about an axis. The objective lens unit is mounted to a front end of the main barrel unit. The ocular lens unit is mounted to a rear end of the main barrel unit, and includes an outer barrel securely connected to the main barrel unit, an inner barrel coupled threadedly with the outer barrel, a lens disposed in the inner barrel, an adjusting barrel disposed on the inner barrel and movable in a direction along the axis, and a release device disposed between the inner barrel and the adjusting barrel. The magnification unit is rotatably disposed in the main barrel unit between the objective lens unit and the ocular lens unit.

IPC Classes  ?

• G02B 27/10 - Beam splitting or combining systems
• G02B 23/00 - Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
• G02B 7/02 - Mountings, adjusting means, or light-tight connections, for optical elements for lenses
• F41G 1/38 - Telescopic sights specially adapted for smallarms or ordnance; Supports or mountings therefor

Abstract

A lens device includes a base, a lens unit, a dividing plate, a cover plate, a shutter unit, and an actuator unit. The base has a front section with a front surface, a rear section with a rear surface, a lens hole, and a mounting space. The lens unit is disposed in the lens hole, and includes a lens. The dividing plate is mounted on the front section and has a first light hole. The cover plate is mounted on the front section and has a second light hole. The dividing plate and the cover plate define a working space therebetween. The shutter unit includes a first shutter piece pivotally disposed in the working space. The actuator unit is mounted in the mounting space, and includes a rotation portion, and an operating portion formed on the rotation portion and extending into the working space.

IPC Classes  ?

• G02F 1/03 - Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on ceramics or electro-optical crystals, e.g. exhibiting Pockels or Kerr effect

Abstract

An optical sight includes an outer barrel unit, an objective lens unit, an ocular lens unit, a magnification unit, a range-finding module, and a display unit. The objective lens and the ocular lens unit are mounted to front and rear ends of the outer barrel unit, respectively. The magnification unit is disposed between the objective lens unit and the ocular lens unit. The range-finding module is disposed on the magnification unit, and includes a light emitter, a light receiver, and a micro processing unit. The display unit is disposed in the outer barrel unit, and includes a seat mounted adjustably between the magnification unit and the ocular lens unit, and a transparent display secured to the seat and coupled electrically to the micro processing unit. The transparent display has an aiming indicator, and a message indicator for visual indication of a range calculated by the micro processing unit.

IPC Classes  ?

• G01C 3/08 - Use of electric radiation detectors

Abstract

An optical transmission device including a driving unit having a transmitting member, a guide member, a frame, a clipping unit and a flexible member is disclosed. The clipping unit has a main clip engaging with one side of the transmitting member, and a sub-clip engaging with the other side of the transmitting member. The flexible member pushes the main clip to the sub-clip, so that the sub-clip radially and axially approaches the transmitting member.

IPC Classes  ?

• G02B 7/02 - Mountings, adjusting means, or light-tight connections, for optical elements for lenses
• G02B 7/04 - Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
• G02B 15/14 - Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective

Abstract

A zoom lens system includes, in order from an object side to an image side along an optical axis thereof, a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power and a fourth lens group having positive refractive power. When zooming from a wide-angle end to a telephoto end, both the first and third lens groups move to the object side, and the second lens group first moves to the image side and then moves to the object side, whereby a first variable distance between the first and second lens groups is increased and a second variable distance between the second and third lens groups is decreased. The fourth lens group is also movable along the optical axis, so as to change a third variable distance between the third and fourth lens groups. Each of the third and fourth lens groups includes at least one aspheric surface. The zoom lens system provides a high zoom ratio and a high image resolution, and is short in overall length and small in size.

IPC Classes  ?

• G02B 15/14 - Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective

Abstract

A compact zoom lens system includes, in order from an object side to an image side along an optical axis thereof, a first lens group having positive refractive power, a second lens group having positive refractive power and a third lens group also having positive refractive power. The first lens group is stationary and includes a reflecting element for bending the optical path. The second and third lens groups are movable along the optical axis, and each of the first, second and third lens groups has at least one aspheric lens surface. When zooming from a wide-angle end to a telephoto end, the second lens group moves toward the object side and the third lens group moves toward the image side, so as to reduce the spacing between the first and second lens groups and increase the spacing between the second and third lens groups. By this specific optical configuration, the compact zoom lens system has the advantages of small size, simple structure, low cost, good reliability and better image quality.

IPC Classes  ?

• G02B 17/00 - Systems with reflecting surfaces, with or without refracting elements

Abstract

The invention provides a distance measuring apparatus for measuring distance to a target, having: a light emitter for emitting a measuring light; a light receiving system for receiving a reflected light reflected from the target and outputting a sensing signal; a comparator having a reference signal input terminal for receiving a reference signal, a sensing signal input terminal for receiving the sensing signal, and a comparison result signal output terminal for outputting a comparison result signal according to comparison results between the reference signal and the sensing signal; and a process and control module for providing the reference signal to the reference signal input terminal of the comparator and adjusting the reference signal according to the comparison signal.

IPC Classes  ?

• G01C 3/08 - Use of electric radiation detectors

Abstract

A sight. A saddle is connected between an ocular housing and an objective housing. A crosshair is disposed in the ocular housing. A light-emitting element is disposed in the ocular housing, illuminating the crosshair. A focal adjustment member is disposed on the saddle, adjusting an objective focus for the sight. A key-type member is connected to the focal adjustment member and is electrically connected to the light-emitting element, controlling operation of the light-emitting element and adjusting luminous brightness thereof.

IPC Classes  ?

• F41G 1/32 - Night sights, e.g. luminescent

Abstract

A gain-adjusting apparatus and method thereof are described. The gain-adjusting apparatus includes an integrator, a first register, a control unit, and a second register. The integrator integrates the gyro signal data to generate the integral data. The control unit is coupled to the first register and the second register, respectively. The control unit determines whether the gyro signal data is either greater than an upper gyro threshold or less than a lower gyro threshold to detect the gyro signal data and decrease the gain value stored in the second register.

IPC Classes  ?

• H04N 5/228 - Circuit details for pick-up tubes

Abstract

A flip-up cover mechanism. An annular body includes two opposite through holes. A displacing member is disposed in the annular body and includes two opposite push portions and a first flange. The push portions respectively protrude from the annular body via the through holes. A cover is rotatably connected to the annular body and includes a second flange detachably engaged with the first flange. A torsion spring is connected between the annular body and the cover. When the second flange is engaged with the first flange, the cover is closed in relation to the annular body and the torsion spring is twisted to provide restoring resilience. When the push portions are respectively pushed through the through holes, the displacing member is elastically deformed to separate the first flange from the second flange and the cover is lifted from the annular body by the restoring resilience provided by the torsion spring.

IPC Classes  ?

• F41A 35/02 - Dust- or weather-protection caps or covers
• F41G 1/38 - Telescopic sights specially adapted for smallarms or ordnance; Supports or mountings therefor

Abstract

The electronic sight includes a base, an optical window, a point light source, a photomask and a low-reflective layer. The optical window is disposed on a first end of the base. The point light source, disposed on a second end of the base, provides a lightbeam. The photomask is disposed between the point light source and the optical window, and the low-reflective layer is formed thereon. The lightbeam passes through the photomask along a first direction, hits the optical window, and is reflected toward a second direction by the optical window. The method for manufacturing the electronic sight includes: providing a base; providing an optical window disposed on a first end of the base; providing a point light source disposed on a second end of the base; providing a photomask; forming a low-reflective layer on the photomask; and positioning the photomask between the point light source and the optical window.

IPC Classes  ?

• F41G 1/30 - Reflecting sights specially adapted for smallarms or ordnance
• F41G 1/00 - Sighting devices
• G02B 23/10 - Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices involving prisms or mirrors reflecting into the field of view additional indications, e.g. from collimator

Abstract

A miniaturized anti-vibration image pickup device is provided, including a fixing base, a moving plane disposed on the fixing base that moves along a first direction and a second direction opposite to the fixing base, an image pickup member disposed on the moving plane, and a driving member. The driving member includes a first magnet and a second magnet disposed on the fixing base. A circuit board is disposed on the fixing base, wherein a first precision coil pattern and a second precision coil pattern are printed on the circuit board. The first precision coil pattern and the second precision coil pattern are formed by a electronic signal and move opposite to the first magnet and the second magnet disposed on the fixing base, so that the anti-vibration image pickup devices moved forward to restrain and compensate for blurred images. The coil on the circuit board designed by printed, reduces thickness of the whole device effectively.

IPC Classes  ?

• H04N 5/228 - Circuit details for pick-up tubes
• G03B 17/00 - APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR - Details of cameras or camera bodies; Accessories therefor

Abstract

A control system for compensating for image shake of an image capture device is provided, including a shake compensating module, a shake compensating switch, a control unit, and a shutter control element operated between a first operating stage and a second operating stage. The shake compensating switch is switched between an active state to enable the shake compensating module and an inactive state to disable the shake compensating module. The control unit enables the shake compensating module when the shake compensating switch is in the active state. The control unit produces a reset signal to disable the shake compensating module when the shutter control element is in the second operating stage before the shake compensating switch is switched to the inactive state. The control unit enables the shake compensating module after a specific period of time from when the shake compensating module was disabled.

IPC Classes  ?

• G03B 17/00 - APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR - Details of cameras or camera bodies; Accessories therefor

Abstract

A lens assembly includes a first lens and a second lens. The first lens includes a first inner end surface, a first outer end surface and slots. The slots formed on the first inner end surface extends toward the first outer end surface, and each slot includes a trough and an inner engaging side portion. The second lens includes a second inner end surface, a second outer end surface and engaging blocks. The engaging blocks formed on the second inner end surface extends toward the first inner end surface of the first lens, and each engaging block includes a crest portion disposed next to the first inner end surface of the first lens and an inner engaging protrusion. A slit is defined by the inner engaging side portion and the trough portion of the slot and the inner engaging protrusion and the crest portion of the engaging block.

IPC Classes  ?

• G02B 7/02 - Mountings, adjusting means, or light-tight connections, for optical elements for lenses

Abstract

A camera having a shutter button, a photo sensor array, an anti-shake module controlled by an anti-shake enable signal, and a mechanical shutter. By pressing the shutter button, a first operation and a second operation are provided to trigger an auto-focus enable signal and an image exposure control signal, respectively. The anti-shake enable signal is enabled when the auto-focus enable signal has been triggered and the image exposure control signal is disabled or has just been triggered. The photo sensor array performs image exposure according to the image exposure control signal. The mechanical shutter is disabled and closed after the image exposure control signal is triggered for exposure period.

IPC Classes  ?

• G03B 17/00 - APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR - Details of cameras or camera bodies; Accessories therefor

Abstract

An image-sensing module. A base includes a plurality of sidewalls and an accommodation hole encompassed by the sidewalls. A flexible printed circuit board includes an installation portion and a through hole formed on the installation portion. A heat-dissipation board is fixed to a bottom surface of the installation portion of the flexible printed circuit board and is aligned with the through hole. An image sensor is fixed to a top surface of the installation portion of the flexible printed circuit board and is aligned with the through hole. The heat-dissipation board, flexible printed circuit board, and image sensor are accommodated in the accommodation hole of the base.

IPC Classes  ?

• H04N 5/335 - Transforming light or analogous information into electric information using solid-state image sensors [SSIS]

Abstract

The invention provides a zoom lens, including a plurality of lens groups. When the zoom lens is in operation, the plurality of lens groups are aligned on a common optic axis, and the zoom lens forms a first plane and a second plane conjugated with the first plane. To retract the zoom lens, at least one of the lens groups is rotated around an axis perpendicular to the common optical axis and toward the first plane, and at least one of the rest of the lens groups is moved toward the second plane along the common optical axis. As a result, overall length of the zoom lens is shortened when it is retracted to obtain the miniaturization.

IPC Classes  ?

• G02B 7/02 - Mountings, adjusting means, or light-tight connections, for optical elements for lenses
• G02B 15/02 - Optical objectives with means for varying the magnification by changing, adding, or subtracting a part of the objective, e.g. convertible objective

Abstract

A zoom lens system includes, in order from an object side to an image side, first to fourth lens groups respectively having positive, negative, positive, and positive refractive powers. When zooming from a wide-angle end to a telephoto end, the first and third lens groups move to the object side and the second lens group moves to the image side, whereby a spacing between the first and second lens groups and a spacing between the third and fourth lens groups are increased and a spacing between the second and third lens groups is decreased. The fourth lens group moves for focusing. The following condition is satisfied: where MG2 represents the movement range of the second lens group when zooming from the wide-angle end to the telephoto end, Y represents a maximum diagonal length of the image plane, and f2 represents the focal length of the second lens group.

IPC Classes  ?

• G02B 15/14 - Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective

Abstract

A laser sight is disclosed, including a housing which defines a first central axis, an objective module, an eyepiece, an erecting system, and an adjusting member. The objective module is fixed to a first end of the housing, and the eyepiece is fixed to a second end of the housing, opposite to the first end. The erecting system is movably disposed between the objective module and the eyepiece and comprises a laser rangefinder defining a second central axis. The adjusting member is movably disposed on the housing and connected to the erecting system. During windage and elevation adjustments, the adjusting member moves with respect to the housing and impels the laser rangefinder, such that the first and second axes form an included angle.

IPC Classes  ?

• F41G 1/00 - Sighting devices

Abstract

A pressing mechanism is adapted for use in an image shake suppressing optical device that includes a driving unit and an image capturing unit. The pressing mechanism is adapted to be disposed between the driving unit and the image capturing unit, and includes an arm body and a press head unit. The arm body has a driven end that is adapted to be connected to the driving unit, and a connecting end that is opposite to the driven end. The press head unit is adapted to be disposed between the connecting end of the arm body and the image capturing unit, and is adapted for providing a resilient pressing force on the image capturing unit when the driven end of the arm body is driven by the driving unit to move the connecting end in a pressing direction.

IPC Classes  ?

• H04N 5/225 - Television cameras
• H04N 5/228 - Circuit details for pick-up tubes

Abstract

A microscope optical system includes, in order from an object side to an image side, a first lens group, a second lens group, a stop, a third lens group, a fourth lens group and a sensor. The first to fourth lens groups all have at least one lens element and at least one of lens elements of the first to fourth lens groups has an aspheric surface. The microscope optical system satisfies several specific conditions so as to provide microscope images of high resolution and high zoom ratio. A digital microscope having the microscope optical system adopts a CCD sensor so that a observer may observe microscope images displayed on a large display screen and store the images for subsequent edition or inspection.

IPC Classes  ?

• G02B 15/14 - Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective

Abstract

A zoom lens for capturing images that enhances the image aberration correction rate to achieve high resolution and zooming ratio. The zoom lens includes, in sequence from an object side to an image side, a first lens group with positive refraction power, a second lens group with negative refraction power, a third lens group with positive refraction power, a fourth lens group with positive refraction power, a fifth lens group with positive refraction power and a sixth lens group with positive refraction power. The positions of first and sixth lens groups are fixed during photographing. When the zoom lens is made to zoom from a wide-angle end to a telephoto end thereof, the second lens group moves toward the image side while the fourth and fifth lens groups move toward the object side. In addition, the zoom lens has a reflection element so as to fold the image light entering thereof.

IPC Classes  ?

• G02B 15/14 - Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
• G02B 17/00 - Systems with reflecting surfaces, with or without refracting elements

Abstract

A slidable lens retracting device is provided for retracting a lens system that include lens group units all positioned on a common optical axis when the lens system is in an operational state. At least one lens group unit is retracted from the on-axis position on the optical axis to an off-axis space radially off the optical axis by the slidable lens retracting device when the lens system is moved to a retracted state. The slidable lens retracting device includes slides mounted to the lens group unit and fixed support members forming inclined surfaces with which the slides are engageable. The control tracks receive the slides therein and are movable along the optical axis to bring the lens system to the retracted position to cause the slides to engage and slide along the inclined surfaces and thus moving the lens group unit to the off-axis space.

IPC Classes  ?

• G02B 7/02 - Mountings, adjusting means, or light-tight connections, for optical elements for lenses
• G03B 17/00 - APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR - Details of cameras or camera bodies; Accessories therefor

Abstract

A lens device includes a seat unit having an image sensing component, a first barrel unit, a first lens module coupled to the first barrel unit, and a second lens module mounted on the seat unit. When the first barrel unit moves toward the seat unit along an optical axis, the first lens module moves in radial directions via a first guide mechanism such that a first lens unit is misaligned with the image sensing component relative to the optical axis, while the second lens module is driven to rotate via a second guide mechanism such that a second lens unit is misaligned with the image sensing component. The lens device further includes a first biasing unit for biasing the first lens module to a first shooting position, and a second biasing unit for biasing the second lens module to a second shooting position.

IPC Classes  ?

• G02B 15/14 - Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
• G02B 7/02 - Mountings, adjusting means, or light-tight connections, for optical elements for lenses
• G03B 17/00 - APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR - Details of cameras or camera bodies; Accessories therefor
• H04N 5/225 - Television cameras

Abstract

A projection zoom lens includes, from a screen side to an image source side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, a third lens group having a positive refractive power, a fourth lens group having a negative refractive power and a fifth lens group having a positive refractive power. Zooming the projection zoom lens from the wide-angle end to the telephoto end causes the second, third and fourth lens groups to move toward the screen side, and the first and fifth lens groups are kept stationary. The projection zoom lens may further include an auto iris being axially movable with the fourth lens group, a composite prism and a cover glass. The projection zoom lens satisfies several conditions so that it can effectively eliminate aberrations and improve the projection image quality.

IPC Classes  ?

• G02B 15/14 - Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective

Abstract

A zoom lens system includes a first lens group, a second lens group, a third lens group, a fourth lens group, and an aperture stop, from an object side to an image side on an optical axis. The zoom lens system satisfies the following condition: T is a focal length of the zoom lens system 100 at a telephoto status.

IPC Classes  ?

• G02B 15/14 - Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective

Abstract

A method of offset compensation for solid-state imaging devices is provided. In the method a first and second detection signal are obtained. The two signals are compared to obtain a difference value. A variable voltage is output according to the difference value to drive a magnetic element. The solid-state imaging device is moved by the magnetic element to compensate the offset of the solid-state imaging device. A system of offset compensation of the solid-state imaging device is also disclosed.

IPC Classes  ?

• H04N 5/228 - Circuit details for pick-up tubes

Abstract

A compact imaging lens system includes three lenses. The first lens is a positive meniscus lens having a convex side facing toward the image side, which has a big focusing power and is provided to capture image and for balance of aberration. The first lens serves to make the lens system a low sensitivity lens system. The second lens is a negative lens and is provided mainly for correcting chromatic aberration and off-axis aberration. An aperture is set between the first and second lenses, and this is of benefit to balance of aberration. The third lens is a negative lens and is provided for correcting off axis aberration. All the lenses can be made of plastics. This facilitates cost reduction, weight reduction, while still maintains a high resolution.

IPC Classes  ?

• G02B 15/14 - Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective

Abstract

W represents a total length of the zoom lens system at the wide-angle end which is defined as a distance from the vertex of a first surface of the first lens on the object side to the image plane.

IPC Classes  ?

• G02B 15/14 - Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective

Abstract

A micro lens, from an object side to an image side, sequentially includes a stop, a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a positive refractive power, and a fourth lens having a negative refractive power. The third and fourth lenses respectively comprise at least one aspherical surface. The negative refractive power gradually decreases from the center to the periphery of the fourth lens, and the refractive power of the periphery of the fourth lens is turned to positive. The relationship of the first lens and the focal length of the micro lens of the micro lens and the relationship of the third lens and the first lens satisfy the desired requirements, thus, to reduce the total length of the micro lens, tolerance sensitivity and cost.

IPC Classes  ?

• G02B 9/34 - Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or – having four components only

Abstract

An image capture control method and apparatus thereof is provided. The method includes capturing automatic exposure environmental data by an image capture unit, calculating initial shutter exposure period and initial sensitivity in accordance with the environmental data, and determining in accordance with the specific mode. Under the specific mode, capturing the image based on the initial shutter exposure period and initial sensitivity when the initial shutter exposure period is less than or equal to the predetermined period. Modify parameters for image capture to obtain final shutter exposure period and final sensitivity when the initial shutter exposure period exceeds the predetermined period. Capturing the image with the final shutter exposure period (t′) and processing the captured image with the final sensitivity (ISO′).

IPC Classes  ?

• H04N 5/335 - Transforming light or analogous information into electric information using solid-state image sensors [SSIS]

Abstract

A wide-angle lens includes, in order from the object side to the image side, a first lens element of negative refractive power, a second lens element of positive refractive power, a third lens element of positive refractive power and a cemented doublet element of positive refractive power consisting of a fourth lens element and a fifth lens element cemented together. The combined focal length of the second, third, fourth and fifth lens elements satisfies one specified condition, which allows the wide-angle lens to be effectively shortened and makes the construction thereof compact.

IPC Classes  ?

• G02B 9/34 - Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or – having four components only
• G02B 9/60 - Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or – having five components only