US 11,927,794 B2
Waveguide with 2-layer stack-up
David Fliszar, Manhattan Beach, CA (US); and Amit Singh, Los Angeles, CA (US)
Assigned to SNAP INC., Santa Monica, CA (US)
Filed by Snap Inc., Santa Monica, CA (US)
Filed on Feb. 9, 2023, as Appl. No. 18/107,584.
Application 18/107,584 is a continuation of application No. 17/411,269, filed on Aug. 25, 2021, granted, now 11,598,914.
Claims priority of provisional application 63/076,583, filed on Sep. 10, 2020.
Prior Publication US 2023/0185016 A1, Jun. 15, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. F21V 8/00 (2006.01); G02B 6/02 (2006.01)
CPC G02B 6/0076 (2013.01) [G02B 6/02395 (2013.01); G02B 6/02209 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A stacked optical waveguide, comprising:
a glass substrate;
a plastic substrate having an optical structure, the plastic substrate secured to and spaced from the glass substrate;
another plastic substrate having another optical structure, the other plastic substrate secured to and spaced from the glass substrate such that the glass substrate is interposed between the plastic substrates;
an air gap disposed between the plastic substrate and the glass substrate; and
another air gap disposed between the other plastic substrate and the glass substrate, wherein the optical structures are encompassed by the respective air gap, and wherein the optical structures face the glass substrate.