公开(公告)号：US10667341B1

公开(公告)日：2020-05-26

申请号：US16554651

申请日：2019-08-29

Applicant: Apple Inc.

Inventor： Moshe Kriman ,  Adar Magen ,  Arun Kumar Nallani Chakravartula ,  Zhenbin Ge ,  Gregory A. Cohoon ,  Eamon H. O'Connor ,  Calvin K. Wong ,  Colleen F. Mischke ,  Christopher Hu ,  Yazan Z. Alnahhas

IPC: F21V29/90 ,  H05B33/08 ,  G02B27/42 ,  G01R31/02 ,  H01S5/022 ,  H05B37/02

Abstract: An optical module includes a diffractive optical element (DOE) with a transparent conductive trace disposed over a surface of the DOE. An emitter is configured to direct a beam of optical radiation through the DOE. Control circuitry is coupled to measure a resistance of the transparent conductive trace and to control operation of the emitter responsively to the resistance.