| 摘要 |
PROBLEM TO BE SOLVED: To provide a motor with excellent efficiency by biasing means in which reaction force from driven means to an actuator does not hinder conversion of vibration of the actuator to driving force of the driven means.SOLUTION: A motor includes: driven means that has a cylindrical rotating surface; an actuator that has a vibrating plate having a projection for biasing a rotating surface of the driven means on an end portion and a piezoelectric body laminated on the vibrating plate; and biasing means for biasing the actuator toward the driven means. In the motor, where a contact point between the rotating surface of the driven means and the projection is defined as a contact point P, an action point at which biasing force by the biasing means is applied to the actuator is defined as an action point Q and frictional coefficient of the projection to the rotating surface is defined as μ, an angle θ between a biasing direction of the biasing means and a direction connecting the contact point P and the action point Q satisfies an inequality: θ>tanμ. |
