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:
Mar. 30, 2004
Filed:
Jan. 02, 2002
Nobuaki Omata, Kyoto, JP;
Atsushi Irie, Ibaraki, JP;
Omron Corporation, Kyoto, JP;
Abstract
There is provided a small and inexpensive actuator which has a simple structure and can obtain a large displacement. When voltage is applied to electrodes and formed on an inner circumferential surface and an outer circumferential surface of a piezoelectric ceramic wound like a coil, deformation occurs in such a direction that an inner circumferential side of the piezoelectric ceramic wound like the coil is contracted, and an outer circumferential side is expanded. Accordingly, if one end portion of the piezoelectric ceramic formed into the coil shape is fixed, the other end portion is rotated in accordance with the deformation of contracting the diameter of this coil.