| 摘要 |
<p>An ultrasonic motor which is easy to manufacture, which has high efficiency, which has few restrictions in a portion that drives a rotor, and which makes it possible to simplify a holding structure is provided. An ultrasonic motor includes a stator 1 and a rotor. In the stator 1, an n number of piezoelectric elements 3 to 6 (n is a natural number) are affixed to one surface of a vibrating member 2, whose outer circumferential edge is circular or polygonal, along a direction in which the outer circumferential edge extends. If the wavelength of a traveling wave that is generated is » ¸ , each of the piezoelectric elements 3 to 6 has a size corresponding to » ¸ /2 in terms of center angle, and the piezoelectric elements that are adjacent to each other are disposed so as to be separated by an interval corresponding to » ¸ /4 in terms of the center angle along the circumferential direction. The piezoelectric elements 3 to 6 are polarized in opposite directions in thickness directions. The rotor is disposed so as to contact the stator 1, and is rotated by receiving vibration resulting from a 3n-wave traveling wave generated by the stator 1.</p> |
