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. 24, 1991
Filed:
Jul. 05, 1990
Applicant:
Inventors:
Tadao Uchikawa, Tokyo, JP;
Osamu Ohnishi, Tokyo, JP;
Osamu Myohga, Tokyo, JP;
Takeshi Inoue, Tokyo, JP;
Assignee:
NEC Corporation, , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L / ;
U.S. Cl.
CPC ...
310323 ; 310325 ; 310328 ; 310333 ;
Abstract
In an ultrasonic motor which uses, as a stator, a longitudinal-torsional composite vibrator in which longitudinal and torsional piezoelectric elements are sandwiched between two blocks, and urges a rotor against the stator, a member is arranged on a piezoelectric element side of the block located near the rotor, so that an inertial mass of the member becomes larger with respect to torsional vibration than that of a rotor side.