Frequency signal control circuit and vibration type motor appara

Details Frequency signal control circuit and vibration type motor appara Frequency signal control circuit and vibration type motor appara

1993-03-12

1996-02-27

Wysocki, Jonathan

Electricity: motive power systems

Nonmagnetic motor

310319, 310316, H02P 700, H01L 4108

Patent

active

054951526

ABSTRACT:
A frequency signal control circuit for a vibration type motor apparatus, which uses as a driving force a vibration generated by application of a frequency signal to an electro-mechanical energy conversion element thereof, inhibits a shift operation of the frequency signal to a lower frequency when a detector detects that a voltage level of a power supply is less than or equal to a predetermined first level, and shifts the frequency to a higher frequency when the detector detects that the voltage level is less than or equal to a second level, the second level being lower than the first level.

REFERENCES:
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patent: 4853578 (1989-08-01), Takahashi et al.
patent: 4965481 (1990-10-01), Kashiyama
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patent: 5099180 (1992-03-01), Noguchi
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patent: 5159253 (1992-10-01), Shimizu et al.
patent: 5165047 (1992-11-01), Shimizu
patent: 5376855 (1994-12-01), Suganuma

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