US 12,345,893 B2
Hot mirror optical cavity and infield illumination
Matthew Thomas Hunwardsen, Moorpark, CA (US)
Assigned to Meta Platforms Technologies, LLC, Menlo Park, CA (US)
Filed by Meta Platforms Technologies, LLC, Menlo Park, CA (US)
Filed on Oct. 25, 2023, as Appl. No. 18/383,717.
Claims priority of provisional application 63/435,675, filed on Dec. 28, 2022.
Prior Publication US 2024/0219721 A1, Jul. 4, 2024
Int. Cl. G02B 27/01 (2006.01); G02B 1/118 (2015.01); G02B 5/20 (2006.01); G02B 5/26 (2006.01); G02B 27/00 (2006.01)
CPC G02B 27/0172 (2013.01) [G02B 1/118 (2013.01); G02B 5/208 (2013.01); G02B 5/26 (2013.01); G02B 27/0093 (2013.01); G02B 2027/0178 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An illumination optical component comprising:
an input aperture to accept near-infrared light from a light source;
an optical substrate having a refractive index;
a hot mirror layer disposed on the optical substrate, wherein the hot mirror layer is configured to confine the near-infrared light to be recycled within the optical substrate and configured to pass visible light; and
exit feature voids patterned into the hot mirror layer on an eye-side of the hot mirror layer, wherein the exit feature voids are configured to illuminate an eyebox region with near-infrared illumination light.