# US 11,028,992 B2 · Optical system for a pixelized light beam > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,028,992 B2 - Document ID: US11028992B2 - Status: Granted - Kind: B2 - Application number: 16/333,921 - Filed: 2017-09-11 - Published: 2019-08-29 - Granted: 2021-06-08 - Earliest claimed: 2016-09-15 - Assignees: Valeo Vision - Applicants: Valeo Vision - Inventors: Nicolas Lefaudeux; Antoine De Lamberterie; Guillaume Thin; Samira Mbata; Thomas Canonne; Van Thai Hoang; Vincent Dubois; Francois-Xavier Amiel - Web page: https://patentgrep.com/patent/US11028992B2 ## CPC - F21S 43/31: Optical layout thereof - B60Q 1/50: for indicating other intentions or conditions, e.g. request for waiting or overtaking - F21S 41/141: Light emitting diodes [LED] - F21S 41/153: arranged in a matrix - F21S 41/155: Surface emitters, e.g. organic light emitting diodes [OLED] - F21S 41/36: Combinations of two or more separate reflectors - F21S 41/365: successively reflecting the light - F21S 41/675: by moving reflectors - G02B 17/0642: {off-axis or unobscured systems in which not all of the mirrors share a common axis of rotational symmetry, e.g. at least one of the mirrors is warped, tilted or decentered with respect to the other elements} - G03B 21/28: Reflectors in projection beam {(in illumination beam G03B21/2066)} - G03B 29/00: Combinations of cameras, projectors or photographic printing apparatus with non-photographic non-optical apparatus, e.g. clocks or weapons; Cameras having the shape of other objects (combinations with flash apparatus G03B15/03) - B60Q 2400/50: Projected symbol or information, e.g. onto the road or car body - F21W 2103/60: Projection of signs from lighting devices, e.g. symbols or information being projected onto the road - F21Y 2115/10: Light-emitting diodes [LED] - F21S: NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS - B60Q: ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D) - F21W: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS - F21Y: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED ## Abstract A luminous device for a motor vehicle, said device including a pixelized light source and an optical system that is arranged to project a pixelized light beam emitted by the pixelized light source, the optical system comprising a first mirror arranged to collect and reflect rays of the pixelized light beam emitted by the pixelized light source, a second mirror arranged to reflect the rays reflected by the first mirror, and a third mirror arranged to receive the rays reflected by the second mirror and to reflect these received rays so as to correct field aberrations. The invention enables improved projection of a pixelized light beam by a luminous motor-vehicle device. ## Claims ### Claim 1 A motor vehicle light including a luminous device comprising: a pixelized light source comprising a plurality of individual light source units each forming a corresponding individual pixel in a pixelized light beam; an optical system that is arranged to project the pixelized light beam emitted by the pixelized light source such that the individual pixels are maintained, the optical system comprising: a first mirror arranged to collect and reflect rays of the pixelized light beam emitted by the pixelized light source, a second mirror arranged to reflect the rays reflected by the first mirror, and a third mirror arranged to reflect the rays reflected by the second mirror so as to correct field aberrations. ### Claim 2 (depends on 1) The motor vehicle light according to claim 1, wherein the third mirror is also arranged to collimate and project the pixelized light beam. ### Claim 3 (depends on 2) The motor vehicle light according to claim 2, wherein the second mirror is arranged substantially in pupil position. ### Claim 4 (depends on 2) The motor vehicle light according to claim 2, wherein at least one of the mirrors is off-axis. ### Claim 5 (depends on 2) The motor vehicle light according to claim 2, wherein the optical system has a hollow architecture. ### Claim 6 (depends on 2) The motor vehicle light according to claim 2, wherein the optical system has a monolithic architecture. ### Claim 7 (depends on 2) The motor vehicle light according to claim 2, wherein the optical system has at least one of the following features: a projection-field height larger than 10°, a projection-field width larger than 40°, a collecting power (f/D) lower than 3, a resolving power lower than 0.5°, at least in a zone at the center of the projection field, and/or a largest dimension (H) smaller than 300 millimeters. ### Claim 8 (depends on 1) The motor vehicle light according to claim 1, wherein the luminous device furthermore includes an optical means arranged to receive the rays reflected by the third mirror and to collimate and project the pixelized light beam. ### Claim 9 (depends on 1) The motor vehicle light according to claim 1, wherein the second mirror is arranged substantially in pupil position. ### Claim 10 (depends on 1) The motor vehicle light according to claim 1, wherein at least one of the mirrors is off-axis. ### Claim 11 (depends on 10) The motor vehicle light according to claim 10, wherein at least one of the mirrors is a free-form mirror. ### Claim 12 (depends on 1) The motor vehicle light according to claim 1, wherein the optical system has a hollow architecture. ### Claim 13 (depends on 1) The motor vehicle light according to claim 1, wherein the optical system has a monolithic architecture. ### Claim 14 (depends on 13) The motor vehicle light according to claim 13, wherein the optical system comprises an entrance face and an exit face. ### Claim 15 (depends on 14) The motor vehicle light according to claim 14, wherein the entrance face and/or the exit face is arranged to correct field aberrations. ### Claim 16 (depends on 1) The motor vehicle light according to claim 1, wherein the optical system has at least one of the following features: a projection-field height larger than 10°, a projection-field width larger than 40°, a collecting power (f/D) lower than 3, a resolving power lower than 0.5°, at least in a zone at the center of the projection field, and/or a largest dimension (H) smaller than 300 millimeters. ### Claim 17 A luminous device for a motor vehicle, said device including a pixelized light source and an optical system that is arranged to project a pixelized light beam emitted by the pixelized light source, the optical system comprising: a first mirror arranged to collect and reflect rays of the pixelized light beam emitted by the pixelized light source, a second mirror arranged to reflect the rays reflected by the first mirror, and a third mirror arranged to reflect the rays reflected by the second mirror so as to correct field aberrations; and a control unit including a processor associated with a memory storing a computer program comprising program-code instructions for the execution of a method comprising: provision of a setpoint for the distribution of light to be produced by the projection of the pixelized light beam; determination of a distribution of light intensities over the pixelized light source corresponding to the setpoint and compensating for a distortion of the distribution of light by the optical system; emission, by the pixelized light source, of a pixelized light beam having the determined distribution of light intensities; and projection, by the optical system, of the pixelized light beam emitted by the light source. ### Claim 18 A method for projection of a pixelized light beam by a luminous device for a motor vehicle, said device including a pixelized light source and an optical system that is arranged to project a pixelized light beam emitted by the pixelized light source, the optical system comprising a first mirror arranged to collect and reflect rays of the pixelized light beam emitted by the pixelized light source, a second mirror arranged to reflect the rays reflected by the first mirror, and a third mirror arranged to reflect the rays reflected by the second mirror so as to correct field aberrations, wherein the method comprising: provision of a setpoint for the distribution of light to be produced by the projection of the pixelized light beam; determination of a distribution of light intensities over the pixelized light source corresponding to the setpoint and compensating for a distortion of the distribution of light by the optical system; emission, by the pixelized light source, of a pixelized light beam having the determined distribution of light intensities; and projection, by the optical system, of the pixelized light beam emitted by the light source. ### Claim 19 (depends on 18) A computer program comprising program-code instructions for the execution of the method according to claim 18 when said program is executed by a control unit for controlling projection of a pixelized light beam by a luminous motor-vehicle device including a pixelized light source, the control unit coupled to the pixelized light source, and an optical system arranged to project a pixelized light beam emitted by the pixelized light source.