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. 27, 2022
Filed:
Nov. 14, 2019
Seiko Epson Corporation, Tokyo, JP;
Shinichi Wakabayashi, Suwa, JP;
Akira Nemura, Azumino, JP;
Takao Hirakura, Matsumoto, JP;
Daisuke Yanagihara, Matsumoto, JP;
Nozomi Fujishige, Kitaazumi-gun, JP;
Kazunori Maeta, Matsumoto, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
An optical path shifting device includes: a holding frame holding a rectangular glass plate; a support part supporting the holding frame in a swingable state; an actuator causing the holding frame to swing; a magnetic sensor detecting a position of the holding frame; and a thermistor detecting a temperature of the magnetic sensor. A drive signal processing circuit includes: an amplifier amplifying a reference signal to generate a drive signal and supplying the drive signal to the actuator; and a signal processing unit inputting the reference signal and an amplifier gain to the amplifier. The signal processing unit performs gain adjustment processing to correct an amplitude value found from an output from the magnetic sensor, based on an output from the thermistor, and to adjust the amplifier gain, based on a corrected value.