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:
Dec. 15, 2009
Filed:
Apr. 15, 2008
Tsukasa Yamada, Kanagawa, JP;
Takahiko Nishiyama, Kanagawa, JP;
Soumei Takahashi, Tokyo, JP;
Toyoki Tanaka, Kanagawa, JP;
Tsukasa Yamada, Kanagawa, JP;
Takahiko Nishiyama, Kanagawa, JP;
Soumei Takahashi, Tokyo, JP;
Toyoki Tanaka, Kanagawa, JP;
Mitsumi Electric Co., Ltd., Tama-Shi, JP;
Abstract
A driving device includes an electro-mechanical transducer having first and second end portions opposite to each other in an expansion/contraction direction, a stationary member coupled to the first end portion of the electro-mechanical transducer, a vibration friction portion coupled to the second end portion of the electro-mechanical transducer, and a rod-shaped moving portion frictionally coupled to the vibration friction portion, whereby moving the moving portion in the expansion/contraction direction of the electro-mechanical transducer. The vibration friction portion is made of a material having a vibration transfer rate of 4900 meters/second or more. The moving portion is made of a material which has a vibration transfer rate of 4900 meters/second or more and which is different from that of the vibration friction portion.