US 12,001,017 B1
Illumination system for object tracking
Yun-Han Lee, Redmond, WA (US); Yu Shi, Redmond, WA (US); Lu Lu, Kirkland, WA (US); and Scott Charles McEldowney, Redmond, WA (US)
Assigned to META PLATFORMS TECHNOLOGIES, LLC, Menlo Park, CA (US)
Filed by Meta Platforms Technologies, LLC, Menlo Park, CA (US)
Filed on Feb. 15, 2022, as Appl. No. 17/672,654.
Claims priority of provisional application 63/189,517, filed on May 17, 2021.
Int. Cl. G02B 27/00 (2006.01); G02B 27/01 (2006.01); G06F 3/01 (2006.01)
CPC G02B 27/0093 (2013.01) [G02B 27/0172 (2013.01); G06F 3/013 (2013.01); G02B 2027/0138 (2013.01); G02B 2027/014 (2013.01)] 15 Claims
OG exemplary drawing
 
1. An illumination system, comprising:
a light source configured to emit an infrared light;
a substrate; and
a plurality of light deflecting elements coupled with the substrate and configured to deflect the infrared light to illuminate an object,
wherein the substrate is a light guide, and the illumination system further includes an in-coupling element coupled with the light guide,
wherein the in-coupling element is configured to couple the infrared light emitted by the light source into the light guide to propagate inside the light guide,
wherein the plurality of light deflecting elements are coupled with the light guide at a plurality of portions of the light guide along a longitudinal direction of the light guide, and are configured to couple the infrared light propagating inside the light guide out of the light guide to illuminate the object, and
wherein the illumination system further includes a light splitting element coupled with the light guide, and configured to split the infrared light in-coupled by the in-coupling element into a plurality of infrared lights propagating toward the plurality of light deflecting elements.