Ultrasonic motor

Details Ultrasonic motor Ultrasonic motor

2007-12-18

2009-06-02

Leung, Quyen P (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C310S323110

Reexamination Certificate

active

07541718

ABSTRACT:
An ultrasonic motor includes a stator that includes a comb body with a plurality of circumferentially-arranged comb-like projections and a piezoelectric body integrally mounted on the comb body, a rotor rotatable with respect to the stator, the rotor establishing pressure contact with the stator, a resin film formed on at least one of pressure contact surfaces of the stator and rotor, and a pressure contact force controlling portion that includes, an elastic member configured to generate a pressure contact force between the stator and rotor with an elastic force thereof, and a compressing portion configured to compress and shorten the elastic member. The pressure contact force controlling portion controls the pressure contact force between the stator and rotor by varying the elastic force of the elastic member depending on temperature of the motor.

REFERENCES:
patent: 4959579 (1990-09-01), Kuwabara et al.
patent: 5363006 (1994-11-01), Yano et al.
patent: 2007/0057596 (2007-03-01), Kurosawa
patent: 2007/0085448 (2007-04-01), Kurosawa
patent: 2007/0145859 (2007-06-01), Kurosawa
patent: 9-98587 (1997-04-01), None
English language Abstract of JP 9-98587.
U.S. Appl. No. 11/955,639 to Kurosawa, which was filed on Dec. 13, 2007.
U.S. Appl. No. 11/865,848 to Kurosawa, which was filed on Oct. 2, 2007.

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