| 摘要 |
PURPOSE:To suppress noise by providing a portion having uneven dynamic rigidity in an elastic body. CONSTITUTION:A vibration wave motor comprises an elastic body 28, a piezoelectric element, a rotor, and the like. The elastic body 28 is formed into a ring and a plurality of grooves are provided at the side of pressure contact face. Forty grooves 28b-28o are made slightly deeper than other groove 28a and the dynamic rigidity is varied in order to prevent generation of progressive wave in unnecessary mode, and 7th order mode of outward bending vibration of ring face is employed as the driving mode. By such arrangement, generation of unnecessary mode is prevented. |
