| 摘要 |
PROBLEM TO BE SOLVED: To stabilize rotary drive performance of a vibration type actuator.SOLUTION: A vibration type actuator 100 rotationally drives a driven body composed of a contact spring member 16, a driven body main body 17, and a gear 18 about a shaft 4 with a vibration excited by a vibrator including a piezo-electric element 3. The gear 18 is composed of a tooth part 18a engaged with an external gear 30, a stationary part 18c, connected to the driven body main body 17, and a coupling part 18b, coupling the tooth part 18a and the stationary part 18c. A degree of freedom of the driven body is restrained in directions other than the rotational direction and a thrust direction of the shaft 4. The flexure stiffness of the coupling part 18b in the thrust direction of the shaft 4 is made to be lower than the flexure stiffness of the stationary part 18c and the tooth part 18a.SELECTED DRAWING: Figure 2 |
