Vibration member and vibration wave driving apparatus
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United States of America Patent
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Sep 13, 2005
Grant Date -
Dec 26, 2002
app pub date -
May 31, 2002
filing date -
Jun 5, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
The present invention has been devised in order to raise driving efficiency of the vibration wave driving apparatus. A vibration member of a vibration wave driving apparatus of the present invention comprises the vibration member constituted of an elastic member and an electro-mechanical energy conversion element, and a rotor contacting the vibration member, and the vibration member generates a travelling wave in the elastic member when an alternating signal is applied to the electro-mechanical energy conversion element, in which an electrode film provided on a surface of the electro-mechanical energy conversion element of the vibration member is divided into a plurality of circular areas with different radiuses and each circular area is divided into a plurality of electrodes along its peripheral direction.
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