Ultrasonic motor device

Details Ultrasonic motor device Ultrasonic motor device

1996-09-30

1998-07-14

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310323, 318116, H01L 4108

Patent

active

057809550

ABSTRACT:
An ultrasonic motor device comprises a vibrating member, a moving member movably disposed on the vibrating member and driven by vibration of the vibrating member, and a pressure regulating member for urging the moving member into pressure contact with the vibrating member. A self-excited vibration circuit has a piezo-electric element having a first surface supporting at least one group of electrodes and a second surface supporting the vibrating member to be vibrationally driven by the piezo-electric element, an amplifying circuit for receiving a voltage generated on the second surface of the piezo-electric element and amplifying the received voltage to a predetermined voltage level, and a boosting circuit for boosting an output voltage of the amplifying circuit and applying the boosted output voltage to the group of electrodes of the piezo-electric element to vibrationally drive the vibrating member.

REFERENCES:
patent: 5101144 (1992-03-01), Hirotomi
patent: 5365139 (1994-11-01), Kasuga et al.
patent: 5461273 (1995-10-01), Kawasaki et al.
patent: 5619089 (1997-04-01), Suzuki et al.

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