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. 19, 1989
Filed:
Mar. 28, 1988
Applicant:
Inventor:
Akio Kumada, Toride, JP;
Assignee:
Hitachi Maxell, Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L / ;
U.S. Cl.
CPC ...
310323 ; 310328 ; 310366 ; 310369 ;
Abstract
A piezoelectric revolving resonator comprising a circular or cylindrical transducer element, in which the center of gravity of the resonator revolves eccentrically around the center of an original circle as a result of resonance thereof upon excitation of the 1st order resonance frequency. Also, the ultrasonic motor is disclosed comprising a resonator of gravity center revolution type with the center of gravity thereof revolving in reversibly clockwise or counterclockwise direction and a rotor pressure fitted on the resonator, the motor utilizing the rotational torque received by the motor through a frictional force.