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:
Apr. 05, 1988
Filed:
May. 27, 1986
Akira Endo, Nagai, JP;
Nobutoshi Sasaki, Nagai, JP;
Marcon Electronics Co., Ltd., Nagai, JP;
Abstract
An ultrasonic motor includes piezoelectric resonators for generating vibration waves, an elastic vibration member along which an elastic wave propagates when driving of the piezoelectric resonators is driven, a sliding member located in contact with the elastic vibration member under pressure and adapted to slide along the elastic vibration member when the elastic wave propagates, and a friction member located on the sliding member and brought into frictional contact with the elastic vibration member, the friction member being made of a material having a hardness of less than 100 and larger than 94 measured by a spring A type hardness tester, a hardness of 40 to 120 measured by a Rockwell's R type hardness tester, hardness of 20 to 80 measured by a Rockwell's M type hardness tester, a hardness of 40 to 90 measured by a Shore A type hardness tester, or a hardness of 20 to 70 measured by a Shore D type hardness tester.