Abstract: Device comprising: a rear panel comprising a network of backlighting elements, a front panel comprising a network of optical valves which are each capable of modulating the brightness of a single primary colour. By the modulation of chrominance which is added to the modulation of luminance for the backlighting elements of the rear panel, the device according to the invention makes it possible to display the images with even more contrast and better quality. A specific control mode makes it possible to avoid the colour “interferences”.

Abstract: A space propulsion module for fitting to spacecraft is provided. The space propulsion module includes a solid propellant chemical thruster including a main body, and at least one electric thruster. The at least one electric thruster is mounted on main body of the solid propellant chemical thruster.

Abstract: An ocular vision system with a display module, which includes a transparent optical guide, is adapted for propagating, by total internal reflections, a light beam transporting an image as far as an extraction section of the optical guide. The system may include: means for positioning the optical guide in a first position in which the extraction zone is placed along a first axis corresponding to a nominal axis of sight of the user's eye; means for positioning the optical guide in a second position in which the extraction zone is placed along a second axis offset with respect to the nominal axis of sight of the user's eye; and means for rotating the optical guide about an axis intended to pass substantially through the center of rotation of the user's eye, enabling the optical guide to pass from the first position to the second position and vice versa.

Abstract: A method for controlling an electronic circuit by means of the first, second and third operating parameters, comprises: determining a range of variation of the third parameter for each value of the first parameter by varying the second parameter, said ranges being different; determining a target value of the third parameter; if the target value is within one of the ranges, operating the electronic circuit by setting the third parameter to the target value; and in the opposite case, selecting the two ranges framing the target value and operating the electronic circuit by consecutively bringing the third parameter into each one of the selected ranges.

Abstract: An optical device includes an optical guide adapted for propagating a light beam by successive total internal reflections and an injection device adapted for injecting the light beam into the optical guide via an injection section. A polarizing material is present between the optical guide and the injection device at the injection section. The injection device includes a prism and an assembly formed by a quarter-wave plate and curved mirror, the injection device being arranged so that a light beam reflected by the polarizing material in the direction of the curved mirror passes through the quarter-wave plate and is then reflected by the curved mirror in the direction of the polarizing material and passes through the quarter-wave plate again.

Abstract: An optical guide comprises at least one guiding element adapted for enabling, by total internal reflections, transporting an image taking the form of a collimated light beam from an injection zone to an extraction zone where an extracting device for extracting the image is mounted. The optical guide comprises a retardation plate and a polarization beam splitter, the polarization beam splitter being placed between the guiding element and the extracting device. The optical guide is such that each ray of said collimated light beam striking the polarization beam splitter for the first time separates into two portions, a first portion being transmitted to the extracting device so as to define a first light imprint and a second portion being reflected by the polarization beam splitter, said second portion continuing to be guided by the guiding element and thus passing twice through the retardation plate before striking the polarization beam splitter so as to define a second light imprint.

Abstract: An optical guide comprises at least one guiding element adapted for enabling, by total internal reflections, transporting an image taking the form of a collimated light beam from an injection zone to an extraction zone where an extracting device for extracting the image is mounted. The optical guide comprises a retardation plate and a polarisation beam splitter, the polarisation beam splitter being placed between the guiding element and the extracting device. The optical guide is such that each ray of said collimated light beam striking the polarisation beam splitter for the first time separates into two portions, a first portion being transmitted to the extracting device so as to define a first light imprint and a second portion being reflected by the polarisation beam splitter, said second portion continuing to be guided by the guiding element and thus passing twice through the retardation plate before striking the polarisation beam splitter so as to define a second light imprint.

Abstract: An optical guide comprises an injection zone intended to inject into the optical guide a light signal and an extraction zone intended to provide the light signal after transport by the optical guide. The optical guide comprises, in a superposed manner, at least two guidance elements. In a zone situated between the injection zone and the extraction zone, the guidance elements are partially separated from one another by a semi-reflective coating of length, in the direction or propagation of the light signal in the optical guide, dependent on a minimum angle of incidence of the light signal and on the thickness of at least one of the guidance elements that the semi-reflective coating separates.

Abstract: An ocular vision system with a display module, which includes a transparent optical guide, is adapted for propagating, by total internal reflections, a light beam transporting an image as far as an extraction section of the optical guide. The system may include: means for positioning the optical guide in a first position in which the extraction zone is placed along a first axis corresponding to a nominal axis of sight of the user's eye; means for positioning the optical guide in a second position in which the extraction zone is placed along a second axis offset with respect to the nominal axis of sight of the user's eye; and means for rotating the optical guide about an axis intended to pass substantially through the center of rotation of the user's eye, enabling the optical guide to pass from the first position to the second position and vice versa.

Abstract: An optical guidance device for optical guidance of a light beam has a first part, in a transparent material, adapted for propagating the light beam by successive reflections. This first part comprises an extraction section comprising at least one microstructure comprising a plane surface adapted to enable the rays of the light beam striking the plane surface to emerge from the guidance device. The device also comprises a second part, in a material substantially identical to that of the first part, comprising a section comprising at least one microstructure with a shape complementary to that or those of the extraction section. The device also has a layer of adhesive assembling the first and second parts in such a way that any microstructure of the extraction section is separated from its complementary microstructure by a transparent medium of substantially constant thickness.

Abstract: A space propulsion module in particular for fitting to spacecraft such as satellites, probes, or indeed the upper stages of rockets. According to the invention, the space propulsion module comprises a solid propellant chemical thruster (10) having a main body (11), and at least one electric thruster (30), said at least one electric thruster (30) being mounted on said main body (11) of the solid propellant chemical thruster (10).

Abstract: An optical device includes an optical guide adapted for propagating a light beam by successive total internal reflections and an injection device adapted for injecting the light beam into the optical guide via an injection section. A polarising material is present between the optical guide and the injection device at the injection section. The injection device includes a prism and an assembly formed by a quarter-wave plate and curved mirror, the injection device being arranged so that a light beam reflected by the polarising material in the direction of the curved mirror passes through the quarter-wave plate and is then reflected by the curved mirror in the direction of the polarising material and passes through the quarter-wave plate again.

Abstract: The invention proposes a short-distance front projection system, that is to say with a wide angle, occupying a small volume and offering a possibility of focusing as well a zoom function. It makes it possible to obtain images with a diagonal greater than 2 meters, the whole of the optical system being at least 50 cm from the plane of the image. This projector is constructed on the basis of three optical elements: an ocular, an afocal lens system and a final group forming an objective intended to form the intermediate image in front of the mirror.

Abstract: A method for optimizing operation which is applicable to a multiprocessor integrated circuit chip. Each processor runs with a variable parameter, for example its clock frequency, and the optimization includes determination, in real time, of a characteristic data value associated with the processor (temperature, consumption, latency), transfer of the characteristic data to the other processors, calculation by each processor of various values of an optimization function depending on the characteristic data value of the block, on the characteristic data values of the other blocks, and on the variable parameter, the function being calculated for the current value of this parameter and for other possible values, selection, from among the various parameter values, of that which yields the best value for the optimization function, and application of this variable parameter to the processor for the remainder of the execution of the task.

Abstract: A system for designing a digital circuit including: a digital circuit simulator based on a file containing a functional description of the digital circuit; a mechanism estimating an output variable from the digital circuit when executing a test bench supplied to the simulator; event counters, events being detected using control signals provided by the simulator when executing the test bench; and a mechanism building at least one calculation model of the digital circuit output variable based on a sequence of estimation data of the output variable and output data of the event counters. The building mechanism can assign a plurality of possible modes to the output variable and build a different output variable calculation model for each possible mode.

Abstract: An optical guide comprises an injection zone intended to inject into the optical guide a light signal and an extraction zone intended to provide the light signal after transport by the optical guide. The optical guide comprises, in a superposed manner, at least two guidance elements. In a zone situated between the injection zone and the extraction zone, the guidance elements are partially separated from one another by a semi-reflective coating of length, in the direction or propagation of the light signal in the optical guide, dependent on a minimum angle of incidence of the light signal and on the thickness of at least one of the guidance elements that the semi-reflective coating separates.

Abstract: A system for designing digital circuitry comprising: a digital circuit simulator based on a file containing a functional description of this digital circuit; means for estimating an output variable from the digital circuit when executing a test bench supplied to the simulator; event counters, the events being detected using control signals provided by the simulator when executing the test bench. Said system further comprises means for selecting a portion of the event counters by iteratively optimizing a model for calculating the output variable of the digital circuit using output data from the event counters and means for registering the selected portion of event counters and the optimized calculation model.

Abstract: An optical guidance device for optical guidance of a light beam has a first part, in a transparent material, adapted for propagating the light beam by successive reflections. This first part comprises an extraction section comprising at least one microstructure comprising a plane surface adapted to enable the rays of the light beam striking the plane surface to emerge from the guidance device. The device also comprises a second part, in a material substantially identical to that of the first part, comprising a section comprising at least one microstructure with a shape complementary to that or those of the extraction section. The device also has a layer of adhesive assembling the first and second parts in such a way that any microstructure of the extraction section is separated from its complementary microstructure by a transparent medium of substantially constant thickness.

Abstract: The invention proposes a short-distance front projection system, that is to say with a wide angle, occupying a small volume and offering a possibility of focusing as well a zoom function. It makes it possible to obtain images with a diagonal greater than 2 metres, the whole of the optical system being at least 50 cm from the plane of the image. This projector is constructed on the basis of three optical elements: an ocular, an afocal lens system and a final group forming an objective intended to form the intermediate image in front of the mirror.

Abstract: The invention relates to informative eyeglasses (500) comprising: —an optical guide (514) forming an eyeglass lens (500) and exhibiting an injection section (504) and an extraction section (508), —a catadioptric collimator (150) comprising: —a refractive entrance surface (202), a first reflecting surface (204), a second reflecting surface (206) and a refractive exit surface (208), each surface (202, 204, 206, 208) constituting a surface of revolution with the same axis of revolution, said axis of revolution constituting the optical axis (102) of the collimator (150), —an illumination source (104) generating an incident light beam (108) illuminating the refractive entrance surface (202), and the axis of which is shifted with respect to said optical axis (102) and which is substantially in the focal plane of said catadioptric collimator (150).