| 摘要 |
PURPOSE:To simplify a composition and miniaturize a device, by arranging electrodes on the end surfaces of a piezoelectric unit oscillator to divide the electrodes each into two or more, and by applying AC voltage to the split electrodes of the respective end surface electrodes. CONSTITUTION:So far as the stator of an ultrasonic wave driving gear is concerned, on both end surfaces of a piezoelectric unit oscillator 1 polarized on both end surface sides, respectively internal split electrodes 2a-2b and external split electrodes 3a-3b are each arranged. Voids 2c, 3c between the internal electrodes 2a-2b and the external electrodes 3a-3b are arranged to be mutually positionally shifted. So far as the stator 4 is concerned, for example, if AC voltage is applied to the electrode 2a and the electrode 3a, rotational oscillation rotating in one direction is generated, and if the AC voltage is applied to the electrode 2b and the electrode 3b, rotational oscillation rotating reversely is generated. As a result, when a rotary body is pressure-welded to the end surface of the stator 4, then the rotary body is rotated in good order. |
