Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reexamination Certificate
2005-07-01
2009-06-30
Leung, Quyen (Department: 2834)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
Reexamination Certificate
active
07554243
ABSTRACT:
The invention relates to a method and device for driving a piezo-electric actuator. A driving voltage is coupled to the piezo-electric actuator by an inductive element coupled in series with the piezo-electric actuator. The piezo-electric actuator is adapted to move an object. The frequency of the driving voltage coupled to the piezo-electric actuator is varied and the velocity of the object is recorded as a function of the frequency. Subsequently, an optimum frequency is determined and the frequency of the driving voltage is adjusted to be substantially equal to the optimum frequency. The optimum frequency is preferably associated with a maximum obtainable velocity of the object.
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Addison Karen B
Fressola Alfred A.
Leung Quyen
Nokia Corporation
Ware Fressola Van Der Sluys & Adolphson LLP
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