Vibration type motor device

Details Vibration type motor device Vibration type motor device

1995-12-18

1998-04-14

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

318116, H01L 4108

Patent

active

057396213

ABSTRACT:
A vibration type motor device excites a vibration member by applying frequency signals to piezoelectric elements so as to obtain a driving force. A vibration state detection piezoelectric element is arranged on the vibration member, and when a vibration state is determined by detecting the phase difference between the output from the detection piezoelectric element and a driving frequency signal, a predetermined signal is superposed on the output from the detection piezoelectric element, thus allowing accurate detection of the vibration state even when the output from the piezoelectric element includes noise.

REFERENCES:
patent: 4727276 (1988-02-01), Izukawa et al.
patent: 5023526 (1991-06-01), Kuwabara et al.
patent: 5159223 (1992-10-01), Suganuma
patent: 5173631 (1992-12-01), Suganuma
patent: 5231325 (1993-07-01), Tamai et al.
patent: 5410204 (1995-04-01), Imabayashi et al.

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