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:
Sep. 27, 2011
Filed:
Apr. 10, 2007
Ryuichi Yoshida, Sakai, JP;
Hirohisa Sueyoshi, Sakai, JP;
Satoshi Shinke, Sakai, JP;
Shinichi Yamamoto, Sakai, JP;
Ryuichi Yoshida, Sakai, JP;
Hirohisa Sueyoshi, Sakai, JP;
Satoshi Shinke, Sakai, JP;
Shinichi Yamamoto, Sakai, JP;
Konica Minolta Opto, Inc., Hachioji-shi, JP;
Abstract
In order to provide a driving device that is capable of eliminating sticking of a movable member due to nonuse, the driving device includes a drive shaft that reciprocates in axial directions with expansion and contraction of an electromechanical transducer element, a movable member that frictionally engages with the drive shaft, and a drive circuit that inputs drive voltage into the electromechanical transducer element, the drive circuit outputting drive operation pattern voltage having a frequency (fd) lower than a resonance frequency (fr) of the electromechanical transducer element and lower than a frequency (fd) that maximizes moving velocity of the movable member and sticking elimination pattern voltage having a frequency lower than the frequency (fd) of the drive operation pattern voltage and in vicinity of a frequency (fd) that maximizes thrust acting on the movable member.