Patent ID: 8446068
Filing Date: 2013-05-21
Classification: H01L,H02N

Abstract:
1. An ultrasonic motor for driving a driven object with a multi-degree of freedom, comprising: a vibrator having an output surface and configured to simultaneously excite two vibration modes to generate an elliptic vibration on the output surface; 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, wherein 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; and 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; wherein the contact portion is formed symmetrical with respect to intersecting axes on the output surface and the contact portion is formed axisymmetrical with respect to the orthogonal axes on the output surface.