Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reexamination Certificate
2005-03-30
2008-10-07
Dougherty, Thomas M (Department: 2834)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
C359S824000, C310S317000
Reexamination Certificate
active
07432635
ABSTRACT:
A driving device in a lens barrel unit of a lens unit drives advancing/retreating of a lens frame holding a lens, and manual focusing. The lens frame is supported freely movably back and forth by an internal driving ring turned and driven when automatic focusing. The internal driving ring is supported by a distance ring so as to be turned and driven via an external driving ring supported turnably by a fixing frame. An operating ring is fixed on the perimeter of the distance ring, and manual focusing driving is performed by turning the operating ring. A transducer of an ultrasonic actuator is pressed against the end face of the distance ring via a driver, frictional contact force between the distance ring and the driver is adjusted by applying flexion standing wave vibration to the transducer, and the amount of turning operating force of the operating ring can be increased/decreased over a wide range.
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Dougherty Thomas M
Olympus Corporation
Olympus Imaging Corp.
Volpe and Koenig P.C.
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