US 12,072,288 B2
Multiple light paths architecture and obscuration methods for signal and perfusion index optimization
Chin San Han, Mountain View, CA (US); Ueyn Block, Menlo Park, CA (US); Brian R. Land, Woodside, CA (US); Nevzat Akin Kestelli, San Jose, CA (US); Serhan Isikman, Sunnyvale, CA (US); Albert Wang, Sunnyvale, CA (US); and Justin Shi, Santa Clara, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Dec. 19, 2022, as Appl. No. 18/084,342.
Application 18/084,342 is a continuation of application No. 16/144,958, filed on Sep. 27, 2018, granted, now 11,536,653.
Application 16/144,958 is a continuation of application No. 14/569,235, filed on Dec. 12, 2014, granted, now 10,215,698, issued on Feb. 26, 2019.
Claims priority of provisional application 62/044,515, filed on Sep. 2, 2014.
Prior Publication US 2023/0204506 A1, Jun. 29, 2023
Int. Cl. A61B 5/00 (2006.01); A61B 5/024 (2006.01); G01N 21/47 (2006.01); G01N 21/55 (2014.01)
CPC G01N 21/4738 (2013.01) [A61B 5/0059 (2013.01); G01N 21/55 (2013.01); A61B 5/02416 (2013.01); A61B 5/681 (2013.01); A61B 5/6898 (2013.01); A61B 5/7203 (2013.01); A61B 2560/0475 (2013.01); A61B 2562/0233 (2013.01); G01N 2201/0638 (2013.01); G01N 2201/068 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A wearable electronic device comprising:
a first window;
a first light sensor positioned behind the first window;
a second window;
a second light sensor positioned behind the second window;
a third window;
a first emitter positioned behind and off-center with respect to the third window;
a second emitter positioned behind the third window; and
a first Fresnel lens positioned between the first emitter and the third window and comprising:
a first zone that is positioned above the first emitter and configured to collimate light emitted by the first emitter; and
a second zone that is positioned above the second emitter and includes ridges that act to obscure components underlying the second zone.