Abstract: The general field of the invention is that of display systems comprising means for generating images of a predetermined object and a display device comprising a semi-transparent projection screen. The system according to the invention is intended to be used simultaneously by at least two observers. The image generating means comprise features arranged to generate a first image of a first object and a second image of a second object, and the display system comprises two pairs of glasses worn by the first and second observer, arranged such that the first observer sees only the first image and not the second image and the second observer sees only the second image and not the first image, each pair of glasses allowing the exterior light to pass through. The first object and the second object may be identical.

Abstract: The field of the invention is that of viewing systems comprising means for generating stereoscopic images, a viewing device comprising a projector and a semitransparent screen and a pair of stereoscopic glasses. The projector according to the invention comprises means arranged so as to project alternatively a first image emitted at a first wavelength and a second image emitted at a second wavelength different from the first wavelength. The pair of glasses comprises a first filter and a second filter, the first filter transmitting the entirety of the spectrum except a first narrow spectral band centred on the first wavelength and the second filter transmitting the entirety of the spectrum except a second narrow spectral band centred on the second wavelength.

Abstract: The field of the invention is that of viewing systems comprising means for generating images of a preset object and a viewing device comprising a semitransparent projection screen on which said images are formed. The viewing system according to the invention comprises a piece of eyewear comprising two eyeglasses, the first eyeglass transmitting said images and the second not transmitting them, both eyeglasses transmitting the exterior landscape. The first eyeglass may be passively obturated via spectral selection or polarization or actively via sequential selection.

Abstract: The general field of the invention is that of touchscreen devices with projected capacitive detection comprising a touch-sensitive matrix panel comprising a plurality of conductive rows and conductive columns, said panel being connected to electronic control means. The electronic control means generate two periodic transmission voltages transmitted at two different frequencies. Analysis of the reception voltages is used to determine the positions of presses on the touch-sensitive panel, including when a row or column is cut. Pressing on a cut row or column is basically determined by calculating the barycenters of ‘virtual’ hollows in the reception voltages corresponding to this cut row or column.

Abstract: The general field of the invention is that of optical guides for collimated images comprising a first and a second image conductor functioning by total reflection, each conductor comprising a plurality of plates that are planar, semi-reflective, mutually parallel and inclined with respect to the plane of the external faces of the image conductors. The two conductors are arranged so as to deliver a collimated image to a large pupil. The optical guide according to the invention comprises an optical beam doubler element having substantially the shape of a rectangular parallelepiped. In its basic version, it comprises four external planar facets, two internal semi-reflective planar mirrors, said mirrors being mutually perpendicular, a planar entrance face intended to receive a collimated image, and an exit face adhesively bonded to the injection section of one of the image conductors. The invention also relates to the whole of the display device associated with this optical guide.

Abstract: The general field of the invention is that of touchscreen devices with projected capacitive detection comprising a matrix-form touch pad comprising conductive rows and columns, said pad being linked to control means and electronic reception and analysis means. The control means generate, for each conductive row and column, a first periodic emission voltage emitted at a first working frequency and a second periodic emission voltage emitted at a second discrimination frequency, different from the first frequency. The electronic reception and analysis means are arranged so as to determine, for each row and for each column, the impedance of a first reception voltage at the working frequency and the impedance of a second reception voltage at the discrimination frequency. According to predetermined values, the values of the two impedances are representative of a touch on the touch pad and its location on the row or on the column concerned.

Abstract: The general field of the invention is that of capacitive dongles used with visualization devices including a capacitive touch-sensitive surface comprising a matrix of conductive rows and columns, the dongle being arranged on said touch-sensitive surface in operational use, the dongle operating in send mode and in receive mode. The dongle according to the invention includes: means for sending periodic analogue signals sent at a specific frequency known as the dongle frequency; a ring-shaped flat conductive metal part connected to said sending means, said part intended to be placed on said touch-sensitive surface; means for receiving the received signals output by said conductive metal part; mean for analyzing said digitized received signals; means for storing the sent and analyzed signals; a digital communication interface.

Abstract: The general field of the invention is that of devices with touchscreen of the capacitive type comprising two matrix touch pads connected to an electronic assembly comprising emission and receiving means. The emission means generate a plurality of emission signals at various frequencies. A period equal to the inverse of the said frequency being associated with each frequency, the values of the frequencies are such that there exist a plurality of integer numbers each associated with a frequency and with a period such that the product of each integer number with the associated period is a constant product.

Abstract: The general field of the invention is that of touchscreen devices with projected capacitive detection comprising a touch-sensitive matrix panel comprising a plurality of conductive rows and conductive columns, said panel being connected to electronic control means. The electronic control means generate two periodic transmission voltages transmitted at two different frequencies. Analysis of the reception voltages is used to determine the positions of presses on the touch-sensitive panel, including when a row or column is cut. Pressing on a cut row or column is basically determined by calculating the barycentres of ‘virtual’ hollows in the reception voltages corresponding to this cut row or column.

Abstract: The general field of the invention is that of touchscreen devices with projected capacitive detection comprising a matrix touchpad comprising a plurality of conducting rows and of conducting columns, the said pad being linked to electronic control means. The electronic control means generate two periodic emission voltages emitted at two different frequencies. The analysis of the reception voltages makes it possible to determine the positions of two simultaneous presses on the touchpad, including when the two presses are done on rows or columns that are close. The determination of the presses is performed essentially by calculating the barycentres of the troughs of the reception voltages.

Abstract: The general field of the invention is that of optical guides for collimated images comprising a first and a second image conductor functioning by total reflection, each conductor comprising a plurality of plates that are planar, semi-reflective, mutually parallel and inclined with respect to the plane of the external faces of the image conductors. The two conductors are arranged so as to deliver a collimated image to a large pupil. The optical guide according to the invention comprises an optical beam doubler element having substantially the shape of a rectangular parallelepiped. In its basic version, it comprises four external planar facets, two internal semi-reflective planar mirrors, said mirrors being mutually perpendicular, a planar entrance face intended to receive a collimated image, and an exit face adhesively bonded to the injection section of one of the image conductors. The invention also relates to the whole of the display device associated with this optical guide.

Abstract: The invention relates to a power transmission device capable of transmitting electricity supplied by an electricity source to at least one powered device connected to said transmission device by means of a communication network, via at least one data transmission cable including at least one pair of conductors, the electrical current being conveyed on the at least one pair of conductors. The power transmission device according to the invention includes, for each connected powered device, a protection device capable of tripping to protect the electricity source in case of electrical malfunction of the powered device as well as balancing of the electricity conveyed on the at least one pair of conductors, said protection device including at least one shared component contributing both to performing said trip and said balancing.

Abstract: A interaction device includes a touch-sensitive surface which generates input data when the touch-sensitive surface is in contact with an actuator, a frame fixed to a periphery of the touch-sensitive surface, an actuator which generates a reaction force as a function of the input data, and a support to which the actuator is coupled. The frame and the touch-sensitive surface are arranged to form a rigid assembly which has a resonant frequency of a few hundred Hertz. The actuator is directly coupled to the frame to displace the rigid assembly relative to the support, and the resonant frequency of the actuator is substantially equal to the resonant frequency of the rigid assembly.

Abstract: The general field of the invention is that of touchscreen devices with projected capacitive detection comprising a matrix-form touch pad comprising conductive rows and columns, said pad being linked to control means and electronic reception and analysis means. The control means generate, for each conductive row and column, a first periodic emission voltage emitted at a first working frequency and a second periodic emission voltage emitted at a second discrimination frequency, different from the first frequency. The electronic reception and analysis means are arranged so as to determine, for each row and for each column, the impedance of a first reception voltage at the working frequency and the impedance of a second reception voltage at the discrimination frequency. According to predetermined values, the values of the two impedances are representative of a touch on the touch pad and its location on the row or on the column concerned.

Abstract: A force measuring method for a touchscreen device makes it possible to measure the force applied to the touchscreen. The principle of the invention consists in measuring the displacement of the two plates supporting the conduction lines and columns of the touchscreen, a displacement which is proportional to the force applied. The displacement of the plates is known by analysis of the variation of the capacitive impedance induced by the presence of an actuator to displace the plates.

Abstract: A interaction device includes a touch-sensitive surface which generates input data when the touch-sensitive surface is in contact with an actuator, a frame fixed to a periphery of the touch-sensitive surface, an actuator which generates a reaction force as a function of the input data, and a support to which the actuator is coupled. The frame and the touch-sensitive surface are arranged to form a rigid assembly which has a resonant frequency of a few hundred Hertz. The actuator is directly coupled to the frame to displace the rigid assembly relative to the support, and the resonant frequency of the actuator is substantially equal to the resonant frequency of the rigid assembly.

Abstract: Techniques relating to an interaction device including a touch-sensitive surface and a chassis and making it possible to generate haptic, sound and visual interaction effects. The sound and haptic effects are generated by common structural and electronic means arranged so that the touch-sensitive surface and the chassis behave like a loudspeaker. The techniques also relate to generating interaction effects. The techniques also relate to a visualization device and apply to computers, televisions, telephones, and touch-sensitive tablets, for example. It preferably applies to visualization devices that have a screen with a large diagonal.

Abstract: The invention provides a touchscreen device including at least one multiplexed touchscreen, control electronics and acquisition and processing electronics, the touchscreen including a first rigid substrate having a plurality of conducting rows, a second flexible substrate having a plurality of conducting columns perpendicular to the rows. The control electronics has a generator of a high-frequency voltage for supplying a first multiplexer for addressing the plurality of conducting rows. The acquisition and processing electronics includes a second multiplexer for addressing the plurality of conducting columns and a synchronous demodulator which operates at the same frequency as the high-frequency voltage generator and delivers a plurality of output voltages on each column and calculation means making it possible to calculate the impedance existing between each output voltage and the input voltage.

Abstract: A system for acquisition of logic states including sensors operable in all-or-nothing mode, each sensor including a switch linked with a pulling resistor between ground and power-supply potential, an analog multiplexer including an output and inputs linking the switches and resistors, voltage representative of the potential linked to a specific input, an analog-digital converter linked to the output, a calculating logic unit which drives the multiplexer and converter, generates input addresses of the multiplexer periodically and sequentially, reads and stores digital values at an output of the converter for each address, determines a digital value of the voltage, determines for each address corresponding to a sensor, a position of the digital value for an address with respect to a threshold, relating to an address, the position representing logic state of each sensor, and an altering device for altering the threshold as a function of the digital value of the voltage.

Abstract: A process for detecting the point of touching of a tactile surface. A high frequency signal is sequentially supplied to four corners of a plate having a capacitive surface. This is accomplished by supplying one diagonal with the others being idle. The output voltages are measured at the four corners for all the various possible positions of touching. Relations between voltages are established from these measurements obtained for each diagonal. During touching, the relations obtained are compared with those stored in order to locate the point of touching.