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US 4,562,374 AGranted
Motor device utilizing ultrasonic oscillation
OwnerToshiiku Sashidainventor
Life of this patent
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Abstract
A motor device utilizing ultrasonic oscillation, which comprises an ultrasonic oscillator including an elastic body and one or more piezoelectric, electrostriction or magnetostriction elements assembled in or on the elastic body, and a movable body movable in a fixed direction. A portion of the ultrasonic oscillator and a portion of the movable body are held pressed against each other. A progressive wave, which is generated on the surface of the elastic member and constituted by a longitudinal wave and a transverse wave, is converted to a uni-directional motion of the movable body.
Claims29
A motor device utilizing ultrasonic oscillation comprising:
- an elastic body;
- a piezoelectric member comprising a plurality of piezoelectric elements in contact with said elastic body;
- electrodes formed on said piezoelectric elements;
- said piezoelectric elements being arranged in first and second groups each consisting of a plurality of elements the electrodes of which groups are connected, respectively, to first and second sources of alternating current, the phase of the alternating current of said second source being displaced ninety degrees with respect to the phase of the alternating current of said first source whereby said piezoelectric elements are driven by said alternating currents applied to said electrodes to cause oscillation in said elastic body which produce a Rayleigh wave at a surface of said elastic body;
- a movable body having a mating surface in contact with said surface of said elastic body;
- and
- means for pressing said mating surface in forced contact with said elastic body surface whereby said Rayleigh wave acts upon said mating movable body surface to cause a unidirectional motion of said movable body with respect to said elastic body.
4 more elements
Dependencies are inferred from the claim text.