Ultrasonic motor

Details Ultrasonic motor Ultrasonic motor

2008-04-29

2008-04-29

Dougherty, Thomas M. (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C310S323080, C310S323020

Reexamination Certificate

active

07365475

ABSTRACT:
An ultrasonic motor includes a circular stator having a piezoelectric element and a comb-tooth body having a plurality of comb teeth which are circumferentially arranged thereon, and a circular rotor having a rotation shaft, the circular rotor being in press-contact with the comb teeth of the circular stator. The circular rotor is provided with a projection which is in the press-contact with the comb teeth, wherein a width of the projection is smaller than a radial width of the comb teeth, and wherein a radial position of the projection varies along a circumferential direction of the circular rotor.

REFERENCES:
patent: 4965482 (1990-10-01), Ohnishi et al.
patent: 5247220 (1993-09-01), Miyazawa et al.
patent: 5296776 (1994-03-01), Wind et al.
patent: 2000-060154 (2000-02-01), None
patent: 2002-354852 (2002-12-01), None
U.S. Appl. No. 11/470,774 to Kurosawa, which was filed Sep. 7, 2006.
U.S. Appl. No. 11/532,244 to Kurosawa, which was filed Sep. 15, 2006.

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