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:
Dec. 14, 2021
Filed:
Mar. 04, 2020
Canon Kabushiki Kaisha, Tokyo, JP;
Yasushi Nakata, Yokohama, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
A photodetector device and an optical encoder device that can suppress level variation of a detection signal are provided. A photodetector device of one embodiment includes: a light receiving unit including a plurality of photoelectric conversion elements; a selector circuit that selects a first photoelectric conversion element group and a second photoelectric conversion element group, in the light receiving unit; a differential amplifier that outputs a detection signal in accordance with a difference between a first output signal of the first photoelectric conversion element group and a second output signal of the second photoelectric conversion element group; and a correction unit that corrects the detection signal based on the first output signal and the second output signal.