Two-dimensionally driving ultrasonic motor

Details Two-dimensionally driving ultrasonic motor Two-dimensionally driving ultrasonic motor

1992-04-08

1994-09-06

Dougherty, Thomas M.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310328, 310366, H01L 4108

Patent

active

053451376

ABSTRACT:
This two-dimensional driving ultrasonic motor comprises a first electro-mechanical energy converting device consisting of an ultrasonic vibrator having a unidirectional polarizing process applied to the entire surface; a second electro-mechanical energy converting device consisting of an ultrasonic vibrator laminated on this first electro-mechanical energy converting device and having a reversely directed polarizing process applied with a central line segment serving as a boundary between the oppositely polarized areas; a third electro-mechanical energy converting device consisting of an ultrasonic vibrator laminated on the first and second electro-mechanical energy converting devices and having a reversely directed polarizing process applied with a line segment serving as a boundary between the oppositely polarized areas, the second and third devices being aligned so that the line segments intersect at right angles; a friction member fixed to the lamination end of the laminated electro-mechanical energy converting devices; and a driven member pressed against this friction member under a predetermined pressure.

REFERENCES:
patent: 4764702 (1988-08-01), Mishiro
patent: 4794294 (1988-12-01), Shimizu et al.
patent: 4812697 (1989-03-01), Mishiro
patent: 4893045 (1990-01-01), Honda
patent: 4958100 (1990-09-01), Crawley et al.
patent: 5081391 (1992-01-01), Owen
patent: 5122700 (1992-06-01), Tamai et al.

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