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:
Aug. 09, 1994
Filed:
Oct. 19, 1993
Applicant:
Inventors:
Daisuke Saya, Yokohama, JP;
Ryoichi Suganuma, Yokohama, JP;
Assignee:
Nikon Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L / ;
U.S. Cl.
CPC ...
310316 ; 310323 ;
Abstract
An ultrasonic motor unit comprises a stator having a piezoelectric member and an elastic member which is excited by the piezoelectric member to generate a travelling vibration wave, and a rotor which is press-contacted to the stator and driven by the travelling vibration wave. At least two sets of input electrodes each having two input electrodes are circumferentially arranged on the piezoelectric member. A drive voltage is applied to only the selected ones of the input electrodes in accordance with a drive power requirement.