Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reexamination Certificate
2007-12-13
2009-08-25
Dougherty, Thomas M (Department: 2834)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
C310S317000
Reexamination Certificate
active
07579750
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 having a contact surface that establishes pressure contact with the stator, and a driving circuit configured to apply a radio frequency voltage for driving the piezoelectric body to the piezoelectric body. The driving circuit includes a voltage generating unit configured to generate a first radio frequency voltage of which a frequency is randomly varied during a predetermined time period after start-up of the ultrasonic motor.
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English language Abstract of JP 9-98587.
English language Abstract of JP 2000-060154.
U.S. Appl. No. 11/958,591 to Kurosawa, which was filed on Dec. 18, 2007.
U.S. Appl. No. 11/865,848 to Kurosawa, which was filed on Oct. 2, 2007.
Dougherty Thomas M
Greenblum & Bernstein P.L.C.
Hoya Corporation
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