| 摘要 |
PURPOSE:To enable to reduce the size and a stepping angle of a stepping motor by providing a plurality of piezoelectric elements at the periphery of a shaft, controlling the elements, providing means for driving any of the elements in a tangential direction and controlling it. CONSTITUTION:A rotational shaft 12 is rotatably supported by bearings 13, 14 provided at the center of a motor vessel 10 and a flange 11. Rotation transmitting means 17 formed of piezoelectric elements are provided at the periphery of a rotational shaft 12, and formed in a cylindrical shape. Electrodes 19, 20 of thin film state are provided on the inner and outer peripheries of the means 17. Rotary drive means 24 are contacted with a moving member 23. Rotating preventing means 18 is provided at the periphery of the shaft 12. A control voltage is applied to the means 17, 18, 24 synchronously with a clock pulse to rotate the shaft 12. |
