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:
Dec. 15, 1992
Filed:
Oct. 04, 1991
Kabushiki Kaisha Toyota Chuo Kenkyusho, Aichi, JP;
Abstract
An ultrasonic motor which has a viration mode of progressive wave with a large vibrational amplitude of an elastic member and which provides a high torque, comprises: at least one vibrator including a disk-shaped elastic member having a driving force transmitting portion, disk-shaped piezoelectric ceramics attached to both surfaces of the elastic member and a plurality of projections provided on both sides of the driving force transmitting portion; and at least one rotor that is in press contact with the driving force transmitting portion of the vibrator. The thickness of the elastic member at a portion between the piezoelectric ceramics is substantially equal to the thickness thereof at the driving force transmitting portion.