Vibrator and ultrasonic motor employing the same

Details Vibrator and ultrasonic motor employing the same Vibrator and ultrasonic motor employing the same

1989-07-03

1991-01-08

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310333, 310358, 310369, H01L 4108

Patent

active

049838741

ABSTRACT:
A vibrator for exciting substantially elliptical motion and an ultrasonic motor employing such a vibrator. A vibrator includes a resonant member having a central hole defined therein and a circumferential portion, a first piezoelectric member for exciting circumferential shearing vibration in the resonant member such that the circumferential portion and the hole are positioned at antinodes of the circumferential shearing vibration about the hole, and a second piezoelectric member for exciting vertical vibration or flexural vibration in the resonant member in a direction different from the direction in which the circumferential shearing vibration is excited by the first piezoelectric member. An ultrasonic vibrator has a moving element held against the resonant member in the vibrator.

REFERENCES:
patent: 4723085 (1988-02-01), Mukohjima et al.
patent: 4734610 (1988-03-01), Okumura et al.
patent: 4829209 (1989-05-01), Kawasaki et al.
patent: 4831305 (1989-05-01), Mukohjima et al.
Construction of Ultrasonic Motors and their Applications, by Tomikawa et al., Japanese J.A.P. vol. 27 (1988) Supplement 27-1, pp. 195-197.

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