Driving apparatus for ultrasonic motor
Patent 4888514 Issued on December 19, 1989. Estimated Expiration Date: 
October 13, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
October 13, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesDrive circuit for a vibration wave motor Driving circuit of a vibration wave motor Driving circuit for vibration wave motor Vibration wave motor Patent #: 4749896 Inventors
AssigneeApplicationNo. 260505 filed on 10/13/1988US Classes:310/316.02Traveling wave motorExaminersPrimary: Budd, Mark O.Attorney, Agent or FirmForeign Patent References
International ClassH01L 041/08Foreign Application Priority Data1987-10-16 JPAbstractIn a driving apparatus for ultrasonic motor, a variable oscillator (44) varies oscillating frequency responding to current level of detected current which flows to a piezoelectric member (1, 2) and is in proportion to mechanical vibration of the piezoelectric member (1, 2) when mechanical resonance frequency varies by change of environmental condition.Other References
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