Abstract:
Optical MEMS scanning micro-mirror comprising: -a movable scanning micro-mirror (101), being pivotally connected to a MEMS body (102) substantially surrounding the lateral sides of the micro-mirror, -a transparent window (202) substantially covering the reflection side of the micro-mirror; -wherein a piezo-actuator assembly (500) and a layer of deformable transparent material (501) are provided on the outer portion of said window (202); -the piezo-actuator assembly (500) being arranged at the periphery of the layer of transparent material (501); -said piezo-actuator assembly (500) and transparent material (501) cooperating so that when actuated, the piezo-actuator assembly (500) causes micro-deformation of the transparent material (501), thereby providing an anti-speckle effect. The invention also provides the corresponding micro-projection system and method for reducing speckle.
Abstract:
L'invention concerne un micro-volet à actionnement électromagnétique comportant une plaquette mobile (1) en rotation autour d'un axe (11), reliée à un cadre fixe (3) par deux bras (7, 9) alignés de part et d'autre de la plaquette selon ledit axe (11), et comportant à sa périphérie une boucle conductrice (13); et sous l'ensemble formé par le cadre fixe et la plaquette mobile, un ensemble d'aimants (51, 53, 55) d'orientations magnétiques distinctes, disposés de façon à créer, au niveau de la plaquette mobile, un champ magnétique latéral (57), dans le plan du cadre, oblique par rapport à l'axe de rotation.
Abstract:
L'invention concerne un micromiroir comportant une plaquette réfléchissante (21) mobile en rotation autour d'un axe (32) et fixée à un cadre (23) par deux bras parallèles (27, 29) alignés de part et d'autre de la plaquette de façon à former l'axe, l'ensemble du cadre et de la plaquette étant fixé sur un support, le micromiroir comportant au moins une couche aimantée (39, 40).
Abstract:
An image projector (2, 2b, 2c) comprising, a light source (4) for providing a light beam (5); a MEMS mirror (6) which is arranged such that it can receive the light beam (5), and which can oscillate about at least one oscillation axis (7a, b) to scan said light beam (5); one or more multiple-beam-generators (8, 80, 41, 61, 62) each of the one or more multiple-beam-generators comprising, a planar beam splitter (9) which is arranged to receive the light beam (5) reflected by the MEMS mirror (6), and a planar reflector (10) which can receive the part of the light beam (5) which is transmitted through the planar beam splitter (9), so that each of the one or more multiple-beam-generators (8, 80, 41 ) can generated multiple beams (15a-c), and wherein the planar beam splitter (9) and planar reflector (10) are arranged to be in parallel; and a focusing lens (11) which is arranged to receive multiple beams (15a-c) which are generated by the one or more multiple-beam-generators (8, 80, 41, 61,62); wherein, in each of the one or more multiple-beam-generators (8, 80, 41, 61,62), the distance (h) between the planar beam splitter (9) and planar reflector (10) is such that the optical distance (OD) between the planar beam splitter (9) and planar reflector (10) is greater than, or equal to, half the coherent length of the light beam (5). There is further provided an optical assembly (1, 20, 30, 40, 60) comprising such an image projector.
Abstract:
A MEMS micro-mirror device comprising, a MEMS micro-mirror, a support structure and, a first and second torsional arm which each connect the MEMS micro-mirror to the support structure, wherein the first and second torsional arms are arranged to define a first oscillation axis about which the MEMS micro-mirror can oscillate; a single actuation coil for oscillating the MEMS micro mirror about the first oscillation axis, at least a portion of the single actuation coil being arranged to cooperate with the MEMS micro mirror; a magnet which is arranged such that a magnetic field generated by the magnet submerges at least the portion of the single actuation coil which cooperates with the MEMS micro mirror; wherein the single actuation coil is configured to extend along the first and second torsional arms.
Abstract:
The present invention provides a projection system (10), preferably for a head-up display e.g. on board a vehicle, comprising a laser source (1), a diffuser (3) and telecentric optics (2) disposed between the laser and the diffuser so that the telecentric optics outputs parallel rays to the diffuser, the diffused light being thus independent from the incidence angle; each pixel of the projected image has the same brightness, regardless of the angle or of the position from which it is viewed.
Abstract:
According to the present invention there is provided a method for projecting a 3-D viewable image onto a display surface, comprising the steps of, providing two or more projection systems; arranging the two or more projection systems into a first group and second group, wherein the first group and second group each comprise one or more projection systems; arranging the first and second group of projection systems such that each group of project systems can project an image on a display surface, wherein the first group of projection systems is arranged such that the first group of projection systems can project an image to a first position on the display surface and the second group of projection systems is arranged such that the second group of projection systems can project an image to a second position on the display surface, wherein the first and second positions are off -set from one another; configuring the first and second group of projection systems such that the first and second group of projection systems alternately project onto the display surface. There is further provided a corresponding projection system.
Abstract:
A projection apparatus, comprising one or more light sources, wherein the one or more light sources are arranged to collectively provide a light signal which comprises multiple wavelengths, wherein the projection apparatus further comprises an optical filter configured to filter the light signal provided by the one or more light sources, so that two or more images may be projected simultaneously by the projection apparatus, each image being projected to a different position. There is further provided a scanning device which uses the afore-mentioned projection apparatus.
Abstract:
A micro-projection system for projecting light on a projection surface (104), comprising: -at least one coherent light source (101); -optical elements (102, 108, 109) in the optical path between said coherent light source and said projection surface; -said optical elements including at least one reflective member (102) actuated by a drive signal for deviating light from said light source so as to scan a projected image onto said projecting surface; -said optical elements including at least one pixel displacement unit (106) for providing a displacement signal synchronized with the image scanning signal so as to reduce speckle onto said projecting surface. The corresponding method for reducing speckle is also provided.
Abstract:
A method of projecting an image with improved safety, using a projection device which comprises a MEMS mirror which oscillates about one or more oscillation axes to scan light from one or more lasers, across a display screen, to project pixels which define an image onto a display screen, the method comprising the steps of, (a) selecting a laser class for the projection device; (b) calculating relationship between maximum accessible emission limit and distance, for the selected laser class, for a predetermined number of black pixels in an image; (c) repeating step (b) a plurality of times, each for a different predetermined number of black pixels in the image, so as to provide a plurality of relationships between maximum accessible emission limit and distance, for the selected laser class, wherein each relationship is for different predetermined number of black pixels in the image; (d) determining the distance between a display screen and the projection device; (e) selecting a desired maximum accessible emission limit for an image which is to be projected by the projection device onto said display screen; (f) selecting a relationship, from the plurality of relationships between maximum accessible emission limit and distance, which contains a maximum accessible emission limit which is equal to the desired maximum accessible emission limit selected in step (e), at the distance determined in step (d) and; (g) identifying the predetermined number of black pixels in the image for that selected relationship; (h) modifying a pixel stream which defines said image which is to be projected by the projection device, so that the pixel stream is provided with said predetermined number of black pixels identified in step (g). There is further provided a corresponding projection device.