Abstract: The invention relates to a head-up display device, including a projector for generating a light beam carrying information to be displayed, a combiner having a display position for displaying the information in the field of vision of a user, and an optical system defining an optical path between the projector and the combiner when the latter is in the display position thereof, for directing the light beam onto the combiner. The optical system includes a first and a second deflecting mirror. The first mirror is arranged for receiving the light beam from the projector and for sending said light beam to the second mirror, the latter being arranged for sending the light beam over the optical path toward the combiner. An actuation system is provided for adjusting the length of the optical path between the projector and the combiner by positioning the first and second deflecting mirrors.

Abstract: A human machine interface (HMI) for an automotive vehicle comprises an instrument cluster and at least one head-up display for displaying information. The HMI includes at least one picture generation unit, each of which includes a laser for generating a modulated laser beam and a micro-electromechanical scanning minor arranged in the optical path of the laser beam for sweeping the laser beam over a diffuser in a two-dimensional Lissajous pattern. The HMI further comprises a central control unit that may be interfaced with a vehicle's on-board computer and/or another on-board device. A processor of the central control unit is configured to determine the pictures to be generated by the at least two picture generation units and to calculate, for each picture generation unit, the two-dimensional Lissajous pattern and the modulation of the at least one laser beam, the combination of which results in the respective picture to be displayed.

Abstract: The invention relates to a head-up display device that includes a retractable combiner having a display position and a storage position; and an actuating mechanism for moving the combiner from its storage position to its display position and vice versa. The mechanism comprises a lifter carriage bearing the combiner. The combiner is arranged standing on the lifter carriage. The lifter carriage executes a motion only in translation in order to reposition the combiner. A shutter element is provided in order to shut the deployment aperture. The shutter element is connected to the actuating mechanism so as to close or open the deployment aperture during at least part of the motion in translation of the lifter carriage.

Abstract: The present speckle reduction device comprises an optical element intended to be passed through by the coherent light beam to be treated. It also includes means able to cause heating of the said optical element; and a cooling element coupled to the said optical element so as to be able to cool the latter. A control module is configured to control the heating means and the cooling element so as to create thermal perturbations in the optical element, causing corresponding variations in the refractive index of the said optical element. The optical element is a piezoelectric crystal which is excited in a specific deformation mode causing its heating.

Abstract: Signaling device designed to be arranged on the reflective element forming a mirror of a rear-view device comprising at least an illumination unit and at least an optical device, characterized by the fact that the optical device includes a symbol generation unit which is provided with at least a diffraction grating designed to form an illuminated image corresponding to a first illuminated symbol, the symbol generation unit being generally transparent and the diffraction grating being formed on the surface of the symbol generation unit without affecting its transparency.

Abstract: Independent optical unit for head-up display system for motor vehicle, intended for the display in the field of view of the driver of a virtual image obtained from an object image coming from a projector, including a first optical component reflecting the incident light rays emanating from the projector towards a second optical component placed in the field of view of the driver for the positioning of a final virtual image, means being provided for the adjustment of their relative position.

Abstract: An instrument cluster, in particular for a motor vehicle comprises a display screen to display information to the driver of the vehicle, a holographic memory containing the information stored in the form of holograms, and a light source to generate one or more reading light beams to extract the information to be displayed from the holographic memory and display the information extracted from the holographic memory on the display screen. A head-up display device is integrated in the instrument cluster and comprises a combiner that projects information extracted from the holographic memory into the head-up field of view of the driver.

Abstract: A projection unit comprising a coherent light source such as a laser diode and a beam shaping element forming a light beam which is directed towards a display, characterized in that it comprises a laser speckle suppression device which is positioned between the laser source and the display and wherein the laser speckle suppression device is a diffusing element actuated randomly by a piezoelectric vibrating structure.

Abstract: The invention relates to a head-up display device, including a projector for generating a light beam carrying information to be displayed, a combiner having a display position for displaying the information in the field of vision of a user, and an optical system defining an optical path between the projector and the combiner when the latter is in the display position thereof, for directing the light beam onto the combiner. The optical system includes a first and a second deflecting mirror. The first mirror is arranged for receiving the light beam from the projector and for sending said light beam to the second mirror, the latter being arranged for sending the light beam over the optical path toward the combiner. An actuation system is provided for adjusting the length of the optical path between the projector and the combiner by positioning the first and second deflecting mirrors.

Abstract: A method for producing a single-layer diffractive combiner for a head-up display having a projection unit with n light sources of ?i wavelength(s), where i=1 to n sending light towards the combiner at an angle ?p. The method includes forming interference fringes for each ?i wavelength on a photosensitive layer with an interference of two light beams from a single laser source of wavelength ?e, where the forming step is repeated n times, and each time the forming step is repeated an angle ?i between the two beams is determined according to ?i=arcsin ((?e/?i)*sin(?p)), one of the interfering beams being divergent and having a spherical wave front and the other being a plane wave, the interference of the beams generating a diffractive network with an adjustable pitch and curved contour fringe lines.

Abstract: Independent optical unit for head-up display system for motor vehicle, intended for the display in the field of view of the driver of a virtual image obtained from an object image coming from a projector, including a first optical component reflecting the incident light rays emanating from the projector towards a second optical component placed in the field of view of the driver for the positioning of a final virtual image, means being provided for the adjustment of their relative position.

Abstract: A diffractive combiner for head-up color display device comprises a first optical diffraction grating configured to diffract, in a direction of diffraction, light of a first incident wavelength on the first grating in a direction of incidence, a second optical diffraction grating configured to diffract, in the same direction of diffraction, light of a second incident wavelength on the second grating in the direction of incidence. The first and second optical diffraction gratings are formed in relief on first and second opposed faces of the combiner. The first and/or the second grating is formed as a wavelength multiplexed optical diffraction grating and configured to diffract, in the direction of diffraction, light of a third incident wavelength on the first and/or second optical diffraction grating in the direction of incidence.

Abstract: The present speckle reduction device comprises an optical element intended to be passed through by the coherent light beam to be treated. It also includes means able to cause heating of the said optical element; and a cooling element coupled to the said optical element so as to be able to cool the latter. A control module is configured to control the heating means and the cooling element so as to create thermal perturbations in the optical element, causing corresponding variations in the refractive index of the said optical element. The optical element is a piezoelectric crystal which is excited in a specific deformation mode causing its heating.

Abstract: A diffractive head up display device that includes a projection unit that uses a display to project an image through a projection window of an image mask, and towards a diffractive combiner. The display and the mask are moveable at right angles to the axis of the projection light beam, so that the adjustment of the position of the virtual image in the field of view of the observer, for example the driver of a vehicle, is obtained by translation of the display and of the mask.

Abstract: Signaling device designed to be arranged on the reflective element forming a mirror of a rear-view device comprising at least an illumination unit and at least an optical device, characterized by the fact that the optical device includes a symbol generation unit which is provided with at least a diffraction grating designed to form an illuminated image corresponding to a first illuminated symbol, the symbol generation unit being generally transparent and the diffraction grating being formed on the surface of the symbol generation unit without affecting its transparency.

Abstract: A diffractive head up display device that includes a projection unit that uses a display to project an image through a projection window of an image mask, and towards a diffractive combiner. The display and the mask are moveable at right angles to the axis of the projection light beam, so that the adjustment of the position of the virtual image in the field of view of the observer, for example the driver of a vehicle, is obtained by translation of the display and of the mask.

Abstract: A method for producing a single-layer diffractive combiner for a head-up display having a projection unit with n light sources of ?i wavelength(s), where i=1 to n sending light towards the combiner at an angle ?p. The method includes forming interference fringes for each ?i wavelength on a photosensitive layer with an interference of two light beams from a single laser source of wavelength ?e, where the forming step is repeated n times, and each time the forming step is repeated an angle ?i between the two beams is determined according to ?i=arcsin ((?e/?i)*sin(?p)), one of the interfering beams being divergent and having a spherical wave front and the other being a plane wave, the interference of the beams generating a diffractive network with an adjustable pitch and curved contour fringe lines.

Abstract: A projection unit comprising a coherent light source such as a laser diode and a beam shaping element forming a light beam which is directed towards a display, characterized in that it comprises a laser speckle suppression device which is positioned between the laser source and the display and wherein the laser speckle suppression device is a diffusing element actuated randomly by a piezoelectric vibrating structure.