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:
Nov. 19, 2002
Filed:
Mar. 28, 2000
Applicant:
Inventor:
Hiroyuki Okada, Izumi, JP;
Assignee:
Minolta Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02N 2/00 ; H01H 4/732 ;
U.S. Cl.
CPC ...
H02N 2/00 ; H01H 4/732 ;
Abstract
In an impact actuator, a piezoelectric device is driven by providing a relatively large difference between the charging time for charging the piezoelectric device in the direction of polarization and the charging time in the reverse direction of polarization. Owing to the elasticity of the piezoelectric device and a driving member, an expansion speed becomes different from a contraction speed, so that a driven member engaged with the driving member by a friction force can be moved relative to the driving member.