Ultrasonic motor and electronic apparatus provided with ultrason

Details Ultrasonic motor and electronic apparatus provided with ultrason Ultrasonic motor and electronic apparatus provided with ultrason

1996-03-06

1998-06-23

Dougherty, Thomas M.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310323, H02N 200

Patent

active

057709122

ABSTRACT:
An ultrasonic motor comprises a piezoelectric element having first and second surfaces, a plurality of electrode patterns disposed on the first surface of the piezoelectric element, first and second circuits for short-circuiting every other one of the electrode patterns to form two electrode pattern groups, a vibrating member disposed on the second surface of and electrically connected to the piezoelectric element, a moving member movably disposed on the vibrating member, a pressure-regulating member for urging the moving member into pressure contact with the vibrating member, and an oscillation drive circuit having at least two power amplifiers and a pre-amplifier. Each of the power amplifiers has an output terminal connected to one of the electrode pattern groups. The pre-amplifier has an input terminal and an output terminal, the input terminal being connected to one of the first and second surfaces of the piezoelectric element, and the output terminal being connected to input terminals of the at least two power amplifiers.

REFERENCES:
patent: 4817066 (1989-03-01), Takasugi
patent: 4998048 (1991-03-01), Furutsu
patent: 5087850 (1992-02-01), Suzuta
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patent: 5453653 (1995-09-01), Zumeris
patent: 5493163 (1996-02-01), Nishikawa
patent: 5495152 (1996-02-01), Fukui

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