| 摘要 |
PURPOSE:To improve driving efficiency, by a method wherein the oscillating body of an ultrasonic motor is constituted of a piezoelectric body, provided with driving electrodes formed after polarization, and an elastic body. CONSTITUTION:An annular ultrasonic motor is constituted of an oscillating body, consisting of an annular elastic body and an annular piezoelectric ceramics, bonded to one of the annular of the elastic body, and a moving body, consisting of the friction member of an abrasion resistant material and another elastic body. In this case, both surfaces of the piezoelectric body 9 are provided with solid electrodes and all of the surfaces are polarized sufficiently, thereafter, the electrodes are constituted and, thus, the elastic body and the oscillating body are constituted. According to this method, all of the surfaces of driving electrodes are polarized sufficiently and mechanical loss during driving is reduced, therefore, the efficiency of the ultrasonic motor may be improved. |
