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. 13, 2022
Filed:
Mar. 15, 2021
Seiko Epson Corporation, Tokyo, JP;
Makoto Murakami, Shiojiri, JP;
SEIKO EPSON CORPORATION, Tokyo, JP;
Abstract
A control unit of a piezoelectric drive device calculates a maximum deceleration α applied to a driven part by the piezoelectric drive device using a friction force Fmax between the piezoelectric drive device and the driven part and a mass m of the driven part, calculates a distance Ln to a target position from a present position of the driven part detected by a position sensor, calculates a reference velocity vth of the driven part using the maximum deceleration α and the distance Ln from the present position of the driven part to the target position, calculates a velocity vn of the driven part from a temporal change of the present position of the driven part detected by the position sensor, and performs control to apply a drive force from the piezoelectric drive device to the driven part when the present velocity vn of the driven part is lower than the reference velocity vth, and apply a brake force from the piezoelectric drive device to the driven part when the present velocity vn is equal to or higher than the reference velocity vth.