Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Yuichi Kurosawa0
Date of Patent
April 29, 2008
0Patent Application Number
115499960
Date Filed
October 17, 2006
0Patent Primary Examiner
Patent abstract
An ultrasonic motor includes a circular stator having a piezoelectric element and a comb-tooth body having a plurality of comb teeth which are circumferentially arranged thereon, and a circular rotor having a rotation shaft, the circular rotor being in press-contact with the comb teeth of the circular stator. The circular rotor is provided with a projection which is in the press-contact with the comb teeth, wherein a width of the projection is smaller than a radial width of the comb teeth, and wherein a radial position of the projection varies along a circumferential direction of the circular rotor.
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