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:
Jul. 19, 2022
Filed:
Oct. 29, 2019
Seiko Epson Corporation, Tokyo, JP;
Ryuichi Sato, Matsumoto, JP;
SEIKO EPSON CORPORATION, Tokyo, JP;
Abstract
A control method for a piezoelectric drive device includes a piezoelectric vibrator having a vibrating portion and a distal end portion coupled to the vibrating portion, in which the distal end portion makes elliptic motion by a stretching vibration and a flexural vibration of the vibrating portion, a driven member driven by the elliptic motion of the distal end portion, and a drive signal generation circuit outputting a stretching vibration drive signal that generates the stretching vibration and a flexural vibration drive signal that generates the flexural vibration in the piezoelectric vibrator, and the method includes, when the driven member is stopped, superimposing and outputting a modulation signal for amplitude modification on the stretching vibration drive signal by the drive signal generation circuit.