Patent ID: 7531942

Claim:
An ultrasonic rotary drive device comprising: an ultrasonic motor including an ultrasonic generating portion and a first rotary output portion, wherein said first rotary output portion is in contact with said ultrasonic generating portion to be rotatable relative to said ultrasonic generating portion and rotates by ultrasonic vibrations generated by said ultrasonic generating portion; and a one-way rotational transfer mechanism including a rotary input portion and a second rotary output portion, wherein said rotary input portion rotates with said first rotary output portion, wherein said second rotary output portion is rotatable independently of said rotary input portion, wherein rotation of said rotary input portion is transferred to said second rotary output portion when said rotary input portion is rotated, and wherein rotation of said second rotary output portion is prevented from being transferred to said rotary input portion when said second rotary output portion is rotated.