The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 24, 2022
Filed:
Jan. 11, 2021
Applicant:
Rohm Co., Ltd., Kyoto, JP;
Inventors:
Assignee:
ROHM CO., LTD., Kyoto, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01S 17/02 (2020.01); G01S 17/06 (2006.01); G01S 7/481 (2006.01); H01L 27/146 (2006.01); H04N 5/3745 (2011.01); G01S 17/04 (2020.01);
U.S. Cl.
CPC ...
G01S 17/04 (2020.01); G01S 7/4811 (2013.01); G01S 17/06 (2013.01); H01L 27/14623 (2013.01); H01L 27/14629 (2013.01); H01L 27/14634 (2013.01); H01L 27/14636 (2013.01); H04N 5/37455 (2013.01);
Abstract
A light emitting and receiving device includes: a light emitting element, a first light receiving element, and a second light receiving element. A reference signal generator generates a reference signal including a component of a predetermined reference frequency. A drive circuit supplies a drive signal to the light emitting element so that a feedback signal corresponding to an output of the first light receiving element matches a reference signal. A correlation detector detects an output of the second light receiving element by correlating with the component of the reference frequency.