US 11,892,572 B1
Spatial light modulator retroreflector mitigation
James Dunphy, San Jose, CA (US); David Schleuning, Piedmont, CA (US); and Ralph Shepard, Menlo Park, CA (US)
Assigned to Waymo LLC, Mountain View, CA (US)
Filed by Waymo LLC, Mountain View, CA (US)
Filed on Dec. 30, 2020, as Appl. No. 17/138,079.
Int. Cl. G02B 26/08 (2006.01); G01S 7/497 (2006.01)
CPC G01S 7/497 (2013.01) [G02B 26/0833 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An optical transmitter module, comprising:
at least one light-emitter device, wherein the at least one light-emitter device comprises light-emitter devices arranged in a 1-dimensional array, and wherein the light-emitter devices are disposed along a shared light-emitter axis;
a plurality of micromirror devices optically-coupled to the light-emitter device, wherein the micromirror devices are arranged in a 1-dimensional array, wherein the micromirror devices are disposed along a shared micromirror axis, wherein the shared light-emitter axis and the shared micromirror axis are parallel, and wherein the light-emitter device is configured to emit respective light beams toward an environment via the micromirror devices, wherein the micromirror devices are configured to deflect the light beams; and
a controller having at least one processor and a memory, wherein the controller executes program instructions stored in the memory so as to carry out operations, wherein the operations comprise:
receiving information indicative of a retroreflector object in the environment; and
based on the received information, causing at least one micromirror device of the plurality of micromirror devices to deflect at least a portion of at least one light beam so that the portion of the at least one light beam does not interact with the retroreflector object.