The invention relates to a Bluetooth communication method implemented between a first electronic device (101) and a second electronic device (102), this second electronic device (102) being capable of sending a secure message comprising data to be processed by the first electronic device (101), the method comprising: obtaining (20) at least one security key by each of the first and second electronic devices (101, 102) the said at least one security key participating in a design of a secure tag; generating (36) a specific singular element for the secure message; transmitting (38) the secure message including its specific singular element and this secure tag by the second electronic device (102) to the first electronic device (101), the transmitting comprising establishing (44) a communication link in a Bluetooth advertising mode between these first and second devices (101, 102).
G06F 21/35 - Authentification de l’utilisateur impliquant l’utilisation de dispositifs externes supplémentaires, p.ex. clés électroniques ou cartes à puce intelligentes communiquant sans fils
H04W 4/80 - Services utilisant la communication de courte portée, p.ex. la communication en champ proche, l'identification par radiofréquence ou la communication à faible consommation d’énergie
H04W 12/03 - Protection de la confidentialité, p.ex. par chiffrement
The method concerns a Bluetooth communication method implemented between a first electronic device (101) and a second electronic device (102), this second electronic device (102) being capable of sending a secure message comprising data to be processed by the first electronic device (101), the method comprising: obtaining (20) at least one security key by each of the first and second electronic devices (101, 102); transmitting (38) the secure message by the second electronic device (102) to the first electronic device (101) comprising establishing (44) a communication link in a Bluetooth advertising mode between these first and second devices (101, 102).
G06F 21/35 - Authentification de l’utilisateur impliquant l’utilisation de dispositifs externes supplémentaires, p.ex. clés électroniques ou cartes à puce intelligentes communiquant sans fils
H04W 4/80 - Services utilisant la communication de courte portée, p.ex. la communication en champ proche, l'identification par radiofréquence ou la communication à faible consommation d’énergie
H04W 12/03 - Protection de la confidentialité, p.ex. par chiffrement
The present invention relates to a method (500) for sensing a displacement of a pointing device (100), like a mouse. Said pointing device (100) comprises least one light source (110) configured to illuminate a surface (900), at least one first secondary photodetector (121), at least one second secondary photodetector (122) and at least one primary photodetector (123). Each individual value of photodetectors are weighted (530) and compared (550) such as to sense said displacement of a pointing device (100).
The present invention relates to a sensing device (100) of a pointing device (200), like a mouse. Said pointing device (200) comprises least one light source (110) configured to illuminate a surface (900), at least one first secondary photodetector (121), at least one second secondary photodetector (122) and at least one primary photodetector (123). Each individual storage element of photodetectors are weighted (530) and compared (550) such as to sense said displacement of a pointing device (200).
The present invention relates to a method (500) for sensing a displacement of a pointing device (200), like a mouse. Said pointing device (200) comprises least one light source configured to illuminate a surface, at least one first secondary photodetector, at least one second secondary photodetector and at least one primary photodetector. Each individual value of photodetectors are weighted and compared such as to sense said displacement of a pointing device (200) by comparing a plurality of storage elements (100).
The present invention regards a test logic method (500) for an Integrated Circuit Device (100) comprising at least one main Integrated Circuit device (200) and at least one auxiliary Integrated Circuit device (300) having at least one auxiliary logical internal state (340). Said at least one main Integrated Circuit device (200) comprises at least one main configuration register (210) and said at least one auxiliary Integrated Circuit device (300) comprises at least one auxiliary configuration register (310), at least one auxiliary logic circuit (330) and at least one auxiliary test logic circuit (350) configured to cooperate with said at least one auxiliary logic circuit (330). Said main configuration register (210) is configured to be connected to said at least one auxiliary test logic circuit (350). Said main test logic method (500) comprises at least one request (610), wherein said at least one main configuration register (210) requests (610) at least one testing (740) of said at least one auxiliary logic circuit (330) via said at least one auxiliary test logic circuit (350), at least one testing (740), wherein said at least one auxiliary test logic circuit (350) tests (740) said at least one auxiliary logic circuit (330), at least on displaying (750), wherein said at least one auxiliary logic circuit (330) displays (750) said at least one auxiliary logical internal state (340), and at least one reading (670), wherein said at least one main configuration register (210) reads (670) said at least one auxiliary logical internal state (340).
The present invention concerns an RFID assembly (100) and an assembly method (500) thereof. The assembly method (500) for an RFID assembly (100) comprises a step of providing (510) at least one integrated circuit (110) which includes at least one IC contact (111) and at least one dielectric layer (112) and a deposition of at least one electrical contact (120) and of at least one re-passivation layer (130). Said at least one electrical contact (120) is deposited (530) on at least one first portion (129) and said at least one re-passivation layer (130) is deposited (550) one at least on second portion (139) which is distinct of said at least one first portion (129).
G06K 19/077 - Supports d'enregistrement avec des marques conductrices, des circuits imprimés ou des éléments de circuit à semi-conducteurs, p.ex. cartes d'identité ou cartes de crédit avec des puces à circuit intégré - Détails de structure, p.ex. montage de circuits dans le support
The present invention relates to a gate controller (100) having a primary signal input (230) which is AC coupled to the gate 113 through a capacitor (210), one or more bias input (220) each connected to the gate (113) through a resistor (131) such as to control the DC voltage bias of the gate and therefore the conductivity o the switching element. Said bias inputs can be properly connected to internal nodes of the charge pump, or charge pump stages, such that the gate controller is self- biased, without using bias-reference external to the charge pump. Said gate controller can be made programmable by using potentiometers in place of the bias resistors. Said programmable gate controller stages can be connected to form a programmable gate controlled charge pump.
H02M 3/07 - Transformation d'une puissance d'entrée en courant continu en une puissance de sortie en courant continu sans transformation intermédiaire en courant alternatif par convertisseurs statiques utilisant des résistances ou des capacités, p.ex. diviseur de tension utilisant des capacités chargées et déchargées alternativement par des dispositifs à semi-conducteurs avec électrode de commande
H03K 17/14 - Modifications pour compenser les variations de valeurs physiques, p.ex. de la température
The present invention relates to at least one open loop control unit (100) configured to monitor the output power of a charge pump converter (500) having an input impedance and a first input impedance controlling terminal (513) configured to be plugged to said open loop control unit (100) and to modify said input impedance. Said open loop control unit (100), according to the invention, comprises at least reference circuit (110) configured to sense said output power of said charge pump converter (500) and at least one control unit (120) configured to receive said difference value (121), to establish a trim value and to send said trim value to said impedance controlling terminal (513) such as to modify said input impedance.
H02M 3/07 - Transformation d'une puissance d'entrée en courant continu en une puissance de sortie en courant continu sans transformation intermédiaire en courant alternatif par convertisseurs statiques utilisant des résistances ou des capacités, p.ex. diviseur de tension utilisant des capacités chargées et déchargées alternativement par des dispositifs à semi-conducteurs avec électrode de commande
H03K 17/14 - Modifications pour compenser les variations de valeurs physiques, p.ex. de la température
The present invention relates to a power control unit (100) configured to monitor the output power of at least one charge pump converter (500) having an input impedance and an input impedance controlling terminal (513) configured to be plugged to said power control unit (100) and to modify said input impedance. Said power control unit (100), according to the invention, comprises at least control circuit (110) configured to sense said output power of said at least one charge pump converter (500) and at least a control unit (120) configured to receive said sensed power value, to establish a control value and to send said control value to said impedance controlling terminal (513) such as to modify said input impedance.
H02M 3/07 - Transformation d'une puissance d'entrée en courant continu en une puissance de sortie en courant continu sans transformation intermédiaire en courant alternatif par convertisseurs statiques utilisant des résistances ou des capacités, p.ex. diviseur de tension utilisant des capacités chargées et déchargées alternativement par des dispositifs à semi-conducteurs avec électrode de commande
H03K 17/14 - Modifications pour compenser les variations de valeurs physiques, p.ex. de la température
The present invention relates to a gate controller (100) having a primary signal input (120) which is AC coupled to the gate 113 through a capacitor (140), one or more bias input (130) each connected to the gate (113) through a resistor (131) such as to control the DC voltage bias of the gate and therefore the conductivity o the switching element. Said bias inputs can be properly connected to internal nodes of the charge pump, or charge pump stages, such that the gate controller is self- biased, without using bias-reference external to the charge pump. Said gate controller can be made programmable by using potentiometers in place of the bias resistors. Said programmable gate controller stages can be connected to form a programmable gate controlled charge pump
H02M 3/07 - Transformation d'une puissance d'entrée en courant continu en une puissance de sortie en courant continu sans transformation intermédiaire en courant alternatif par convertisseurs statiques utilisant des résistances ou des capacités, p.ex. diviseur de tension utilisant des capacités chargées et déchargées alternativement par des dispositifs à semi-conducteurs avec électrode de commande
H03K 17/14 - Modifications pour compenser les variations de valeurs physiques, p.ex. de la température
The present invention relates to a power control unit (100) configured to control the efficiency of a charge pump converter (500) having a first input terminal (210) and a second input terminal (310), at least one primary attenuator (410) and at least one secondary attenuator (420) between said first input terminal (210) and said second input terminal (310), a first output terminal (250), a second output terminal (350), at least one secondary attenuator controlling terminal (435) and at least one primary attenuator controlling terminal (445) configured to be plugged to said power control unit (100). Said primary attenuator controlling terminal (435) and said secondary attenuator controlling terminal (445) are configured to attenuate or amplify a signal of said first input terminal (210) and said second input terminal (310). said power control unit (100).
H02M 3/07 - Transformation d'une puissance d'entrée en courant continu en une puissance de sortie en courant continu sans transformation intermédiaire en courant alternatif par convertisseurs statiques utilisant des résistances ou des capacités, p.ex. diviseur de tension utilisant des capacités chargées et déchargées alternativement par des dispositifs à semi-conducteurs avec électrode de commande
H03K 17/14 - Modifications pour compenser les variations de valeurs physiques, p.ex. de la température
13.
PASSIVE NEAR FIELD COMMUNICATION (NFC) DEVICE, METHOD AND SYSTEM
The present disclosure relates to a NFC communication system, to a method of establishing communication between a wireless communication device and a passive NFC device and to a respective passive NFC device. The passive NFC device comprising: - a NFC controller (12), - a NFC transceiver (14) coupled with the NFC controller (12), - at least one persistent flag (20) coupled with the NFC controller (12), the persistent flag (20) being switchable between an activated state and a deactivated state, - wherein the NFC controller (12) is configured to perform a logical operation being divisible into a sequence of at least a first subtask and a second subtask and wherein the NFC controller (12) is configured to ascertain the status of the persistent flag (20) and wherein the NFC controller (12) is further configured to selectively perform at least one of the first subtask and the second subtask on the basis of the status of the persistent flag (20).
The present invention relates to an assembly (1) comprising a main terminal (T1) furnished with a communication module (14), using at least a first communication protocol (P1), able to connect said main terminal to a communication network (100) allowing the use of at least one function, said main terminal being devised so as to use at least one configuration program (PCONF), the configuration program (PCONF) making it possible to select at least one preferential function (FCTi) and to generate a code representative of the selected preferential function (CODEi), and a second communication protocol (P2), said assembly furthermore comprising at least one secondary terminal (T2) furnished with a passive communication module (20) using the second communication protocol (P2) to communicate with said main terminal so as to save the code representative of the selected preferential function (CODEi).
The present invention concerns a humidity sensor (1) comprising a base plate (10) made from silicon on which several intermetallic dielectric layers (16), each provided with a metal area (18), and a metal layer are arranged, said metal layer (20) being etched to form two electrodes (22), each comprising a reinforcement provided with a multitude of arms, said reinforcements being mounted such that the arms of each reinforcement are interleaved in such a way as to have arms positioned facing each other. The sensor can comprise a temperature or heating module.
G01N 27/22 - Recherche ou analyse des matériaux par l'emploi de moyens électriques, électrochimiques ou magnétiques en recherchant l'impédance en recherchant la capacité
The present invention relates to an electronic device (1) comprising a processing unit (5) capable of generating a signal representing a physical quantity, of a motor (4) driving a display device, said motor comprising two terminals (Mot1, Mot2), positive and negative, by which the processing unit controls same, the electronic device also comprising at least one shock-detecting circuit (7) connected between the processing unit and a terminal of the motor in order to detect an external shock applied to the motor, characterised in that the shock-detection circuit comprises a comparison portion (72) for comparing an induced voltage generated in the motor following a shock with a predetermined reference voltage (Vref) in order to determine a shock, the detection circuit also comprising a selection portion.
G04C 3/14 - Horloges ou montres électromécaniques indépendantes d'autres garde-temps et dans lesquelles le mouvement est entretenu par des moyens électriques comprenant un moteur pas à pas
H02P 8/02 - Dispositions pour la commande de moteurs dynamo-électriques tournant pas à pas spécialement adaptées pour les moteurs pas à pas monophasés ou bipolaires, p.ex. moteurs de montre, moteurs d'horloge
The present invention relates to a signal generator circuit (1) supplied with a supply voltage and comprising toggling means (2) that comprises a first input to which a DC input signal (E1) having a defined amplitude is connected, a second input (Sclk) to which a clock signal having a defined duty cycle is connected, and a third input for resetting to zero, and providing, at the output, an output signal (S1, Sout) having the same duty cycle as the clock signal and the same amplitude as the input signal. The invention is characterized in that said circuit furthermore comprises regulating means (3) designed to compare the output signal to a reference signal (E3) representative of the desired duty cycle and to provide a control signal (S4) connected to the third input of the toggling means so as to activate the reset to zero in order to modify the duty cycle of the output signal.
The invention relates to a passive half-duplex transponder comprising: a resonant circuit formed by an antenna and an input capacitor and arranged so as to allow an electrical signal (32) to oscillate in this resonant circuit when it periodically receives via the antenna an activation signal from a reader; at least one switch arranged between the input capacitor and a storage capacitor such that these two capacitors are placed in parallel when the switch is turned on; and a peak voltage detector arranged to measure the amplitude of the electrical signal oscillating in the resonant circuit. This transponder is arranged to deliver, during an emission period, "plucking" pulses to the resonant circuit so that the oscillating electrical signal maintains at least a certain amplitude. To do this, the transponder comprises a circuit for defining a variable threshold voltage used to trigger the plucking pulses, and arranged in order to trigger each plucking pulse when the voltage of the oscillating electrical signal reaches substantially the variable threshold voltage, in a respective period located before an extremum of this oscillating electrical signal and in alternation with this extremum.
G06K 19/07 - Supports d'enregistrement avec des marques conductrices, des circuits imprimés ou des éléments de circuit à semi-conducteurs, p.ex. cartes d'identité ou cartes de crédit avec des puces à circuit intégré
19.
INSTALLATION OR DEVICE WITH A HIGH-DEFINITION MULTIMEDIA INTERFACE
The Installation or device is equipped with a power supply unit (50) and a High-Definition Multimedia Interface (HDMI), this installation or device being able to be connected to a second HDMI device with which it can communicate by using a protocol defined in the HDMI Standard, this installation or device being able to be set in Standby or Power-down mode and to be removed from this Standby or Power-down mode by said second HDMI device via a Consumer Electronic Control (CEC) line. The installation or device has a Power Management Unit (PMU) arranged on the primary side (52) of said power supply unit, this PMU having its own power supply circuit directly connected to the power supply source of this installation or device and being arranged for switching OFF the electrical energy on the secondary side (54) of said power supply unit when this installation or device enters said Standby or Power-down mode. The PMU is associated with CEC means (56) on said primary side arranged for decoding and processing at least a wake-up signal of a CEC Protocol defined in the HDMI Standard. The CEC interface (58) is arranged for directly communicating with the CEC means on said primary side. In particular, the CEC interface comprises a HDMI supply domain and a PMU supply domain which have in-between a galvanic isolation, a data transfer between these HDMI and PMU domains via the CEC line being operated only through one or several non-galvanic element(s).
The invention relates to an electric device having at least one interference suppression capacitor (6, 60) which, upon interruption of the mains voltage (7), is actively discharged by connecting an electric load (69) in parallel. For this purpose, the device comprises means for monitoring the mains voltage (7) and means for connecting (68) the electric load.
G06F 1/26 - Alimentation en énergie électrique, p.ex. régulation à cet effet
G06F 1/32 - Moyens destinés à économiser de l'énergie
H02M 7/162 - Transformation d'une puissance d'entrée en courant alternatif en une puissance de sortie en courant continu sans possibilité de réversibilité par convertisseurs statiques utilisant des tubes à décharge avec électrode de commande ou des dispositifs à semi-conducteurs avec électrode de commande utilisant des dispositifs du type thyratron ou thyristor exigeant des moyens d'extinction utilisant uniquement des dispositifs à semi-conducteurs dans une configuration en pont
H02M 7/217 - Transformation d'une puissance d'entrée en courant alternatif en une puissance de sortie en courant continu sans possibilité de réversibilité par convertisseurs statiques utilisant des tubes à décharge avec électrode de commande ou des dispositifs à semi-conducteurs avec électrode de commande utilisant des dispositifs du type triode ou transistor exigeant l'application continue d'un signal de commande utilisant uniquement des dispositifs à semi-conducteurs
21.
ELECTRIC DEVICE HAVING LOW POWER CONSUMPTION IN THE STAND-BY STATE
The invention relates to an electric device, in particular having at least one illuminating system comprising LEDs, for example, a television comprising LED backlighting (57). The electric device has a stand-by state (ZPM) with very low power consumption, in which only a control unit (3) is supplied with power via a capacitive voltage divider. For this purpose, in addition to parts of the power supply system (2), according to the invention the interference suppression capacitor (6) is also switched off.
G06F 1/26 - Alimentation en énergie électrique, p.ex. régulation à cet effet
G06F 1/32 - Moyens destinés à économiser de l'énergie
H02M 7/162 - Transformation d'une puissance d'entrée en courant alternatif en une puissance de sortie en courant continu sans possibilité de réversibilité par convertisseurs statiques utilisant des tubes à décharge avec électrode de commande ou des dispositifs à semi-conducteurs avec électrode de commande utilisant des dispositifs du type thyratron ou thyristor exigeant des moyens d'extinction utilisant uniquement des dispositifs à semi-conducteurs dans une configuration en pont
H02M 7/217 - Transformation d'une puissance d'entrée en courant alternatif en une puissance de sortie en courant continu sans possibilité de réversibilité par convertisseurs statiques utilisant des tubes à décharge avec électrode de commande ou des dispositifs à semi-conducteurs avec électrode de commande utilisant des dispositifs du type triode ou transistor exigeant l'application continue d'un signal de commande utilisant uniquement des dispositifs à semi-conducteurs
The invention relates to a connection device (1) for an integrated circuit adapted for connecting an external component. The integrated circuit is powered by a supply voltage (VDD) and a portion of the circuit operates using at least one internal regulated voltage (VREG). The connection device includes two active transistors (N1, P1) having different conductivity and mounted in series between the supply voltage (VDD) and the ground (VSS). The drains of the two active transistors (N1, P1) are connected together in order to form an external contact pad (2). The gates of the active transistors are controlled by voltage signals having the same amplitude (Vesd). The connection device further includes a switching means (3) for modifying the control signals (Vesd) applied to the gates of the active transistors without exceeding the highest voltage of the supply voltage (VDD) or the internal regulated voltage (VREG). It thus possible to adapt the voltage domain of said integrated circuit to an external component connected to the external contact pad (2).
The invention relates to a processor circuit (1) with a Harvard architecture. The processor includes a computation unit (2), a first memory element (3a) for storing data and a second memory element (4a) for storing instructions. The first and second memory elements (3a, 4a) are connected to the computation unit by at least one communication bus (5, 6). The processor circuit includes a management means (8) provided between the first and second memory elements and the computation unit, capable of saving a plurality of data or instructions in order to save time in the event of consecutive reading.
The invention relates to a processor circuit (1) that comprises a computation unit (2), a first memory element (3) for storing data and a second memory element (4) for storing instructions. The first and second memory elements (3, 4) are each connected by a communication bus (5, 6) to the computation unit. The first and second memory elements define a single memory unit (7) in order to define a memory of the shared type. A blocking signal (S-block) acts on the computation unit (2) in order to block the operation thereof.
The present invention concerns an electrical installation or device equipped with a power supply unit comprising a voltage converter having primary and secondary parts respectively defining a primary side and a secondary side of this electrical installation or device. This power supply unit comprises a power management unit arranged on said primary side, the primary part of the converter being associated with a control circuit also arranged on said primary side and controlling the electrical energy flowing in the primary power path of said primary part. The control circuit receives from the power management unit at least a first control signal for switching OFF the electrical energy in said primary power path, said power supply unit entering a very low power mode ("Power-down" mode) when said first control signal is set to OFF so that the converter is not supplied anymore. The power management unit is arranged such that, in said very low power mode, it can receive or generate at least a wake-up signal and set to ON said first control signal in response to said wake-up signal for supplying again said primary and secondary parts of the converter.
Instrument for calibrating an altimeter device delivering an indication of the altitude of the place where it is located on the basis of an atmospheric pressure measurement, characterized in that it comprises means for transmitting a signal carrying information representative of the altitude at which it is located. The invention also relates to a device delivering an indication of the altitude of the place where it is located on the basis of an atmospheric pressure measurement and a calibration system comprising a calibration instrument and an altimeter device.
G01C 5/06 - Mesure des hauteurs; Mesure des distances transversales par rapport à la ligne de visée; Nivellement entre des points séparés; Niveaux à lunette en utilisant des moyens barométriques
G01C 25/00 - Fabrication, étalonnage, nettoyage ou réparation des instruments ou des dispositifs mentionnés dans les autres groupes de la présente sous-classe
27.
PROCESS FOR MANUFACTURING AN RFID-TYPE COMMUNICATION DEVICE
The invention relates to a process for manufacturing a communication device (36) formed from an electronic unit (38) placed on a support (7A) and from a coil (4) wound around a core defined by this support. To produce such a communication device automatically, provision is made to use the electronic unit as means for guiding the electrical wire serving to form the coil. The electrical wire is thus pressed against two approximately vertical surfaces of the electronic unit so as to be in contact with respective areas of this unit. In particular, these contact areas are defined by tabs (40, 42) which have a development at the top and against which the electrical wire is pressed. Once the coil has been formed, the ends (20, 22) of the latter are held under tension in the configuration resulting from the winding and are soldered to the contact tabs or areas of the electronic unit. No manual reworking of the ends is required. In addition, the electrical wire does not have to be precisely positioned relative to the electronic unit during winding, given that the wire is simply pressed against lateral parts of the electronic unit.
A device comprising an integrated circuit and an antenna coil, with or without a support for winding the coil, is produced in the following manner: firstly, an electronic module comprising the electronic circuit and two electrical connection leads or tabs is formed; then, said coil is formed by firstly surrounding a first lead; next, the winding of the coil is carried out; and, finally, the second lead is surrounded. The joining of the ends of the coil to the two leads of the electronic module is carried out in the configuration resulting from the winding.
The invention relates to a procedure for accessing a non-volatile memory for a watch, the watch including two supply terminals that can be accessed from the outside and that define a potential difference corresponding to a current supply voltage, and a non-volatile memory control circuit produced using technology supporting a predetermined maximum supply voltage, wherein the procedure comprises transmitting to the non-volatile memory control circuit, through a watch supply terminal: (a) an opening key for granting access to the non-volatile memory; (b) a command for accessing the non-volatile memory; the procedure being characterised in that the opening key is a predetermined command transmitted by modulating the current supply voltage so that the latter does not exceed the predetermined maximal supply voltage.
IPICO SOUTH AFRICA (PROPRIETARY) LIMITED (Afrique du Sud)
EM MICROELECTRONIC-MARIN SA (Suisse)
Inventeur(s)
Van Eeden, Hendrik, Lodewyk
Pretorius, Albertus, Jacobus
Preishuber-Pfluegl, Josef
Schuhai, Andreas
Roz, Thierry
Turner, Christophe
Abrégé
An electronic tag is configured to be responsive to a TTO or TTF protocol energising signal from a reader, but to suspend transmission when receiving an RTF protocol communication signal from a reader. The tag typically includes a protocol detector 120 which is operable to detect receipt of an RTF protocol communication signal and to suspend transmission when the electronic tag receives an RTF protocol communication signal from a reader.
G06K 7/00 - Méthodes ou dispositions pour la lecture de supports d'enregistrement
G06K 19/07 - Supports d'enregistrement avec des marques conductrices, des circuits imprimés ou des éléments de circuit à semi-conducteurs, p.ex. cartes d'identité ou cartes de crédit avec des puces à circuit intégré
31.
METHOD AND SENSING DEVICE FOR MOTION DETECTION IN AN OPTICAL POINTING DEVICE, SUCH AS AN OPTICAL MOUSE
There is described a method for measuring relative motion between an illuminated portion of a surface (S) and an optical sensing device comprising a photodetector array (420) including a plurality of rows and columns of pixels respectively aligned along first and second axes (X, Y) comprising essentially the steps of comparing at a first point in time light intensity between neighbouring pixels of the photodetector array and determining along each of the first and second axes, edge direction data (10, 12) from the detected first light intensity pattern, extracting edge inflection data (14, 16) from the edge direction data from the detected first light intensity pattern, comparing at a second point in time light intensity between neighbouring pixels and determining along each of said first and second axes, the edge direction data from the detected second light intensity pattern, extracting edge inflection data from the edge direction data from the detected second light intensity pattern. The method further comprises the steps of extracting inflection line data (18, 20) being descriptive of the succession of two adjacent edge inflection data of the same type transversal to at least one determined axis, counting a total number of the extracted line conditions and determining a measurement of the relative motion between the optical sensing device and the illuminated portion of the surface along the determined axis based on a ratio of a comparison of the edge inflection data previously extracted and a function of the total number of inflection conditions and the total number of line conditions.
There is described a method for detecting a lift condition from an illuminated surface portion of an optical motion sensing device. According to a first embodiment, two different 'loss-of-focus' thresholds are used. A first threshold is used when the optical pointing device is not moving, and a second threshold greater than the first one is used when the optical pointing device is moving. The optical device further requires means for detecting whether it is moving or not. According to a second embodiment, a dynamical loss-of-focus threshold depending on an average number of motion features that the surface exhibits to the sensor of the optical pointing device is used.
brevets
