Vibration driven motor

Details Vibration driven motor Vibration driven motor

1992-11-12

1995-04-11

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310316, 318116, H01L 4108

Patent

active

054061601

ABSTRACT:
2n (n is an integer) projections are formed per half wavelength on the driving surface of a vibration member of a disclosed vibration driven motor. The vibration member has an A driving electrode group (A.sub.1 to A.sub.8) and a B driving electrode group (B.sub.1 to B.sub.8) polarized at a .lambda./2 pitch so as to alternately have opposing expansion/contraction polarities with respect to a wavelength .lambda. of a vibration wave to be excited, and .lambda./4-pitch vibration detection electrodes (S.sub.A, S.sub.B) and three ground common electrodes (G), which are arranged between the A and B electrode groups. The vibration detection electrodes (S.sub.A, S.sub.B) are arranged to have substantially loop positions of standing waves generated by the corresponding A and B driving electrode groups as their centers.

REFERENCES:
patent: 5001404 (1991-03-01), Kataoka
patent: 5034646 (1991-07-01), Shirasaki
patent: 5134333 (1992-07-01), Atsuta
patent: 5134348 (1992-07-01), Izukawa et al.
patent: 5148075 (1992-09-01), Shirasaki
patent: 5198714 (1993-03-01), Salomon et al.

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