Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reexamination Certificate
2005-05-06
2010-02-16
Benson, Walter (Department: 2837)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
Reexamination Certificate
active
07663291
ABSTRACT:
The present invention may provide a accurate drive unit1which comprises an electromechanical transducer10, a drive element12fixed on the one end of the electromechanical transducer10, a movable element11engaging with the drive element12frictionally and a drive circuit3applying a cyclic drive voltage to the electromechanical transducer10, in which the oscillation of the drive element12as the result of the expansion and contraction of the electromechanical transducer10due to the drive voltage causes relative displacement of the movable element11to the drive element12. The waveform of drive voltage is varied according to the relative position of the movable element11to the drive element12.
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Japanese “Notification of Reason for Refusal”, dated Nov. 25, 2008, for counterpart Japanese Patent Application No. 2004-139459; Together with an English-translation thereof.
Addison Karen B
Benson Walter
Konica Minolta Holdings Inc.
Sidley Austin LLP
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