| 摘要 |
PURPOSE:To provide an ultrasonic motor which can rotate stably at high efficiency even upon application of radial load to an output transmission shaft. CONSTITUTION:An elastic member 29 is placed between a mover 27 and an output transmission shaft 28 for transmitting rotation of the mover 27 to an external load. An output take-out part 28b of the output transmission shaft 28 is provided on the side of a bearing 31 located on the oscillator 24 side in order to regulate the rotational position of the output transmission shaft 28 thus taking out output from the oscillator 24 side of the output transmission shaft 28. Since the distance between a fulcrum, i.e., the bearing 31, and a working point is short, deformation of the output transmission shaft 28 due to load functioning thereon can be retarded when abnormal force is applied radially to the output transmission shaft 28. Furthermore, deformation absorbing effect of the elastic member 29 mounted on the mover 27 can be exhibited by providing the output transmission shaft 28 with a free end at a part coming into contact with the elastic member 29. |
