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:
Aug. 11, 2020
Filed:
Oct. 06, 2015
Canon Kabushiki Kaisha, Tokyo, JP;
Akio Atsuta, Yokosuka, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A drive device for a vibration actuator, which makes it possible to perform low-speed and stable driving and expand a dynamic range of driving speed, includes first and second switching circuits, a position detection sensor, and a microprocessing unit (MPU). The first switching circuit and the second switching circuit apply a first drive signal and a second drive signal, for exciting vibration, to an electromechanical energy conversion element of a vibrating body. The position detection sensor acquires information on a relative position between the vibrating body and a driven body in press contact with each other. The MPU switches the first and second drive signals to third drive and fourth drive signals, respectively, based on the acquired information, to thereby change a position at which a highest one of peaks of amplitude of vibration excited in the vibrating body is formed.