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:
Jan. 27, 1998
Filed:
Dec. 26, 1995
Michihisa Suga, Tokyo, JP;
NEC Corporation, , JP;
Abstract
The present invention provides a piezoelectric rotation driving apparatus wherein the number of the piezoelectric driving bodies is reduced so as to reduce the size of the apparatus. The apparatus is capable of achieving high efficiency and high torque by extinguishing an inertia rotation period. In are preferred embodiment of the invention, a set of the piezoelectric driving bodies including stacked piezoelectric elements are pressed against a cylindrical rotation body serving as a rotor, which is fitted to a rotation shaft, with leaf springs. The piezoelectric driving bodies are combined integrally with each other by a fitting pin such that action directions of forces of action members in the piezoelectric driving bodies driven by the stacked piezoelectric elements are opposite to each other.