Vibration wave driven actuator

Details Vibration wave driven actuator Vibration wave driven actuator

1992-03-23

1993-09-21

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310316, H01L 4108

Patent

active

052472213

ABSTRACT:
In the present invention, electromechanical energy conversion elements are disposed on a vibrator, and first and second electrodes are provided on the elements. AC voltages having different phases from each other are applied to the first and second electrodes to produce a travelling vibration wave, which relatively moves the vibrator and a member subjected to pressure contact with the vibrator. Furthermore, in a vibration wave motor having means for detecting vibration state via a third electrode, by, for example, making characteristics of elements adjacent to both sides of the third electrode identical to prevent that the center of sensitivity deviates from the center of the electrode, the correct resonance frequency is detected.

REFERENCES:
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patent: 4649311 (1987-03-01), Mukohjima et al.
patent: 4658172 (1987-04-01), Izukawa
patent: 4692649 (1987-09-01), Izukawa
patent: 4763148 (1988-08-01), Tsukimoto et al.
patent: 4771203 (1988-09-01), Mukohjima et al.
patent: 4833358 (1989-05-01), Suzuki et al.
patent: 4914337 (1990-04-01), Takagi
patent: 4926084 (1990-05-01), Furutsu et al.

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