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. 20, 2003
Filed:
Sep. 12, 2000
Yasuaki Serita, Osaka, JP;
Minolta Co., Ltd., Osaka, JP;
Abstract
An impact type piezoelectric actuator moves a driven member reciprocally by charging and discharging a piezoelectric device at different charging and discharging speed corresponding to moving direction. When a moving speed of the driven member is supposed to be slower than a predetermined threshold speed due to drop of voltage of a battery or drop of an ambient temperature, a controller drives the piezoelectric actuator in a manner to increase expansion and contraction of the piezoelectric device. Alternatively, when the moving speed of the driven member is supposed to be equal to or higher than the predetermined threshold speed, the controller drives the piezoelectric actuator in a manner to decrease the expansion and contraction of the piezoelectric device for saving the electric power consumption of the battery.