US 11,994,674 B2
Apparatus for eye tracking
Milan Momcilo Popovich, Leicester (GB); Jonathan David Waldern, Los Altos Hills, CA (US); and Alastair John Grant, San Jose, CA (US)
Assigned to DigiLens Inc., Sunnyvale, CA (US)
Filed by DigiLens Inc., Sunnyvale, CA (US)
Filed on May 17, 2021, as Appl. No. 17/322,387.
Application 17/322,387 is a continuation of application No. 16/593,546, filed on Oct. 4, 2019, granted, now 11,009,699.
Application 16/593,546 is a continuation of application No. 15/796,169, filed on Oct. 27, 2017, granted, now 10,437,051, issued on Oct. 8, 2019.
Application 15/796,169 is a continuation of application No. 15/274,049, filed on Sep. 23, 2016, granted, now 9,804,389, issued on Oct. 31, 2017.
Application 15/274,049 is a continuation of application No. 14/409,875, granted, now 9,456,744, issued on Oct. 4, 2016, previously published as PCT/GB2013/000210, filed on May 10, 2013.
Claims priority of provisional application 61/688,300, filed on May 11, 2012.
Prior Publication US 2022/0066206 A1, Mar. 3, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. G02B 27/00 (2006.01); A61B 3/113 (2006.01); F21V 8/00 (2006.01); G02B 6/34 (2006.01); G02B 27/01 (2006.01); G02F 1/29 (2006.01); G02F 1/295 (2006.01); G02F 1/313 (2006.01); G02B 5/18 (2006.01); G02B 6/42 (2006.01); G02F 1/1334 (2006.01); G06V 40/18 (2022.01); H04N 5/33 (2023.01)
CPC G02B 27/0093 (2013.01) [A61B 3/113 (2013.01); G02B 6/0016 (2013.01); G02B 6/34 (2013.01); G02B 27/017 (2013.01); G02B 27/0172 (2013.01); G02F 1/292 (2013.01); G02F 1/2955 (2013.01); G02F 1/3132 (2013.01); G02B 5/18 (2013.01); G02B 6/4287 (2013.01); G02B 2027/0138 (2013.01); G02B 2027/014 (2013.01); G02B 2027/0174 (2013.01); G02B 2027/0187 (2013.01); G02F 1/13342 (2013.01); G02F 1/294 (2021.01); G02F 2201/16 (2013.01); G02F 2201/30 (2013.01); G02F 2201/302 (2013.01); G02F 2201/305 (2013.01); G02F 2201/307 (2013.01); G02F 2203/24 (2013.01); G02F 2203/28 (2013.01); G02F 2203/62 (2013.01); G06V 40/193 (2022.01); H04N 5/33 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An eye tracker comprising:
a light source;
a detector;
a waveguide, wherein the waveguide comprises:
an input coupler configured to in-couple light from the light source into a first optical path inside the waveguide;
an illumination grating configured to output light from the light source onto an eye;
an imaging grating configured to input light reflected off the eye into a second optical path inside the waveguide;
an output coupler configured to output the reflected light into the detector.