Vibration wave driven motor

Details Vibration wave driven motor Vibration wave driven motor

1991-02-01

1992-07-28

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

H01L 4108

Patent

active

051343339

ABSTRACT:
This invention relates to a vibration type motor in which frequency signals differing in phase from each other are applied to an electro-mechanical energy conversion element disposed on a vibration member to thereby vibrate the vibration member and drive a movable member by the vibration force. This invention provides a motor of the described type in which a monitoring portion for detecting the vibrated state of the vibration member is provided at a location avoiding a location at which the rigidity of the vibration member exhibits rigidity differing from the rigidity of the entire vibration member so that the vibrated state can be accurately detected.

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patent: 4954741 (1990-09-01), Furutsu

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