Ultrasonic motor and electronic apparatus utilizing...

Details Ultrasonic motor and electronic apparatus utilizing... Ultrasonic motor and electronic apparatus utilizing...

2005-10-04

2005-10-04

Dougherty, Thomas M. (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

Reexamination Certificate

active

06952072

ABSTRACT:
An ultrasonic motor has a piezoelectric vibrator driven by a voltage signal to undergo expansion and compression movement. At least two elastic bodies are connected to opposite ends of the piezoelectric vibrator and are vibrationally driven by the expansion and compression movement of the piezoelectric vibrator. Each of the elastic bodies has at least one groove formed in a surface thereof for converting the expansion and compression movement of the piezoelectric vibrator into torsional vibration so that the elastic bodies generate a combination of longitudinal vibration and torsional vibration. A movable member is connected to the elastic bodies to be frictionally driven by the combination of longitudinal and torsional vibrations generated by the elastic bodies.

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patent: 6469419 (2002-10-01), Kato et al.
patent: 6509673 (2003-01-01), Komoda

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