Vibration wave driven apparatus

Details Vibration wave driven apparatus Vibration wave driven apparatus

1994-07-12

1996-12-10

Budd, Mark G.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

H01L 4108

Patent

active

055833900

ABSTRACT:
In a vibration wave driven motor, when the radius of the arcuate portions and the length of the straight portions of a track type resilient member of an elliptical shape having straight portions and arcuate portions are (R) and (L), respectively, the ratio (R/L) is made equal to or greater than a particular value, whereby the resonance frequencies of two standing waves can be made coincident with each other and the torsion component of the straight portions can be reduced or the direction of the torsion can be made uniform with a result that the driving characteristic in the straight portions can be improved and also the electrode pattern of a piezo-electric element can be simplified.

REFERENCES:
patent: 4580073 (1986-04-01), Okumura et al.
patent: 4672256 (1987-06-01), Okuno et al.
patent: 4692652 (1987-09-01), Seki et al.
patent: 4723129 (1988-02-01), Endo et al.
patent: 4740796 (1988-04-01), Endo et al.
patent: 4786836 (1988-11-01), Tokushima
patent: 4810923 (1989-03-01), Tsukimoto et al.
patent: 4978882 (1990-12-01), Kitani

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