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. 10, 2022
Filed:
Sep. 25, 2020
Seiko Epson Corporation, Tokyo, JP;
Abstract
A drive circuit includes a drive signal output circuit that outputs a drive signal supplied to the piezoelectric element and a first constant voltage signal that is constant at a first voltage value; a switch circuit having one end electrically coupled to an output terminal of the drive signal output circuit and the other end electrically coupled to the first terminal of the piezoelectric element, and a reference voltage signal output circuit that is electrically coupled to the second terminal of the piezoelectric element and outputs a second constant voltage signal which is constant at a second voltage value, in which before the reference voltage signal output circuit starts to output the second constant voltage signal, the one end and the other end of the switch circuit are controlled to be non-conductive, and the drive signal output circuit outputs the first constant voltage signal.