| 摘要 |
An ultrasonic motor for driving a driven object with a multi-degree of freedom includes a vibrator configured to simultaneously excite two vibration modes to generate an elliptic vibration on an output surface thereof, a driven object configured to be driven by the elliptic vibration generated on the output surface, and a driving element interposed between the output surface and the driven object. The driven object includes a spherical portion to be brought into contact with at least the output surface via the driving element. The elliptic vibration exhibits different vibration amplitudes at different positions on the output surface. The output surface includes a plurality of regions which exhibit greater vibration amplitudes than other regions on the output surface. The driving element includes a contact portion with at least two regions exhibiting greater vibration amplitudes than other regions of the contact portion, and is provided on the output surface.
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