Ultrasonic motor

Details Ultrasonic motor Ultrasonic motor

1990-06-15

1991-06-18

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

H01L 4108

Patent

active

050251864

ABSTRACT:
An ultrasonic motor adapted to generate a travelling wave by a piezoelectric element and a vibrator to which the piezoelectric element is bonded, the displacement of these parts due to the travelling wave being amplified by a comb-like projection of the vibrator, arranged alternately in the circumferential direction thereof, to frictionally drive a movable member engaged under pressure with the vibrator characterized in that the piezoelectric element is provided on one surface thereof with fan-shaped electrode patterns, the number of which is a multiple of 4, arranged at regular intervals in the circumferential direction thereof, wherein the number of the fan-shaped electrode patterns and that of the vibrator have no common divisor with respect to each other, whereby the scatter of performance of ultrasonic motors, which is caused by a difference in the position in which the piezoelectric element and vibrator are bonded together, is eliminated to enable ultrasonic motors of uniform performance to be obtained.

REFERENCES:
patent: 4580073 (1986-04-01), Okumura
patent: 4771203 (1988-09-01), Mukohjima et al.
patent: 4779019 (1988-10-01), Onishi et al.
patent: 4786836 (1988-11-01), Tokushima
patent: 4829209 (1989-05-01), Kawasaki et al.
patent: 4882500 (1989-11-01), Iijima
patent: 4950135 (1990-08-01), Tojo et al.

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