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:
Apr. 27, 2010
Filed:
Apr. 10, 2008
Ryuichi Yoshida, Sakai, JP;
Kazuhiro Shibatani, Sakai, JP;
Ryuichi Yoshida, Sakai, JP;
Kazuhiro Shibatani, Sakai, JP;
Konica Minolta Opto, Inc., Tokyo, JP;
Abstract
It is provided a drive unitin which the displacement amount of the frictional engagement membercan be reduced without lowering the driving torque, having a drive circuitcomprised of a bridge circuit which includes charge switching elements Q, Qfor connecting the electrodesof the piezoelectric elementto the power supplyand discharge switching elements Q, Qfor connecting the electrodesto ground, and a switch circuitfor inserting a limiting resistor Rin at least either one of an current path between the power supplyand the piezoelectric elementand an current path between the piezoelectric elementand the ground.