Abstract

An optical projection assembly directs a first image to an eyebox of a user combined with light from a second source. A relay optic has a non-rotationally symmetric refractive gradient- index (GRIN) component arranged to receive the first image. A tilted, partially reflective combiner has a tilted first surface to receive and transmit the light from the second source, and an opposite second surface to receive and project the first image from the relay optic and transmit the light received from the second source to the eyebox. The GRIN component is configured to reduce a perceivable aberration of the first image introduced by the combiner.

IPC Classes  ?

• B29D 11/00 - Producing optical elements, e.g. lenses or prisms
• G02B 3/00 - Simple or compound lenses
• G02B 27/01 - Head-up displays

Abstract

An optical system providing reduced retroreflection includes an optical element with an optic aperture. A retroreflection defeat filter has a partially obstructing material configured to absorb or reflect a subset of the optical system waveband while transmitting the rest. The partially obstructing material is arranged to occupy a first portion of the optic aperture being at least half of the optic aperture, and the partially obstructing material does not occupy a second portion of the optic aperture for the remainder of the optic aperture.

IPC Classes  ?

• G02B 5/00 - Optical elements other than lenses
• G02B 5/20 - Filters
• G02B 5/22 - Absorbing filters
• G02B 23/12 - Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices with means for image conversion or intensification

Abstract

A field inverting optical waveguide is disclosed. The waveguide is configured to convey electromagnetic radiation from an ingress end to an egress end along an optical path. The waveguide includes an optically flat input surface disposed at the waveguide ingress end, and an exit surface disposed substantially opposite the input surface at the waveguide egress end. The exit surface includes an array of prisms projecting outward from or inward to the exit surface. The input surface and the exit surface are arranged substantially orthogonally to the optical path.

IPC Classes  ?

• G02B 6/34 - Optical coupling means utilising prism or grating
• G02B 27/30 - Collimators

Abstract

A method and device for a compact shock isolation apparatus are disclosed. The apparatus is adapted for mounting a sensitive component to a base. The apparatus includes a collar, a plurality of axial flexures mounted to the base to attenuate an axial shock force/acceleration. A plurality of radial flexures extend axially between the collar and the axial flexures, connecting each of the axial flexures to the collar to attenuate radial and/or circumferential shock forces/acceleration. A plurality of attachment pads disposed between adjacent radial flexures extend axially from the collar toward the axial flexures and attach to the sensitive component. The shock isolation apparatus supports the sensitive component in non- contacting proximity to the base. The apparatus optionally includes vibration dampening material disposed between the sensitive component and the axial flexures and/or the radial flexures.

IPC Classes  ?

• F41G 1/387 - Mounting telescopic sights on smallarms
• F41G 7/00 - Direction control systems for self-propelled missiles