| 摘要 |
PROBLEM TO BE SOLVED: To avoid abnormal wear between an output part of a vibrator and a rotor (a driving ring) even when an external force is applied to a driving force output member and realize the downsizing and high output.SOLUTION: In an ultrasonic motor 1, an output part 13 of a vibrator 10 is subject to pressing contact and then a driven body 20 rotates around a fixed shaft 21. In order to achieve the above object, the ultrasonic motor 1 includes: rolling members 23 positioned between the fixed shaft 21 and the driven body 20 and held by the fixed shaft 21 and the driven body 20 so as to roll; and a driving force output member 24 that is disposed so that a rotation force, generated by the rolling members 23 rotating on an outer periphery of the fixed shaft 21 while rolling, is transmitted to the driving force output member 24 and the driving force output member 24 rotates around the fixed shaft 21. |
