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:
The general field of the invention is that of monochromatic stereoscopic image projectors including two light sources that illuminate two imagers, the radiation of the two light sources having a spectral distribution centred on a central wavelength, the first imager and the second imager being connected to a generator of stereoscopic image pairs. The image projector includes a dichroic separating filter that transmits the portion of the spectrum below the central wavelength and that reflects the portion of the spectrum above this central wavelength. The first light source and the second light source are arranged symmetrically on either side of the dichroic separating filter. The image projector operates cyclically, each cycle including two alternations. Each alternation consists in changing the emission source and in switching to the two displays the left and right images emitted by the generator of image pairs.
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:
Visual display systems are described having means for generating stereoscopic images, a device for visual display of said stereoscopic images having a projector and a semitransparent screen; and a pair of stereoscopic spectacles. The projector according to the invention has an imager and an interference filter, the spectral transmission of which has at least one transmission band of determined width centred around a wavelength, said wavelength being dependent on the incidence of the light on said interference filter. The projector has means allowing the angular position of the filter to be varied between two determined positions so as to transmit, according to the position, either a first spectral band or a second spectral band. The pair of stereoscopic spectacles has a first lens transmitting the first spectral band and blocking the second spectral band and a second lens providing the opposite function.
Abstract:
The general field of the invention is that of systems having a capacitive touch screen. The system according to the invention has a portable capacitive device that is intended, in operational mode, to be carried by a user. The touch screen operates at at least one first frequency. The system operates according to at least one first identification mode in which the portable device has transmission means for transmitting a first periodic analogue signal that is transmitted at a second frequency, referred to as “identification” frequency, that is different from the first frequency, said frequency being in a range of frequencies that are transmitted by the human body, said first signal being unique and associated with the user. The portable touch screen has first means for detecting and identifying said first signal and second means for authorizing or denying access to predetermined applications of the touch screen, which are dependent on the identification of the user. Other modes of operation of the system are possible.
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. The receiving means comprise a synchronous amplitude demodulation arranged in such a manner as to perform the multiplication of the received signal by a plurality of periodic functions representative of each frequency, the multiplied signals obtained being integrated over an identical period of time corresponding to the said constant product, each signal thus integrated being representative of a received signal at a single given frequency.
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:
A viewing devices includes an optical assembly comprising a display, an optical system forming of this display an image at infinity and a light guide for expanding a pupil in two spatial directions. The guide comprises three planar mirrors and two semi-reflective plates, the optical axis of the optical assembly being inclined with respect to the surface of the first planar mirror by an angle different from zero and strictly smaller than 90 degrees, the light beams output from the optical assembly propagating inside the light guide via successive reflections from the planar mirrors and the semi-reflective plates, the transmission of the light beams output from the optical assembly to outside of the light guide occurring via successive transmissions by the second semi-reflective plate.
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 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.