| 摘要 |
PROBLEM TO BE SOLVED: To provide an actuator that has a simple configuration, is compact, and is configured so that a drive member can be reliably retained at a predetermined position.SOLUTION: An actuator 21 has: an electric motor 26; a power transmission mechanism 28 including a worm 33 which is provided to a rotating shaft 27 of the motor and a worm wheel 34 which meshes with the worm; a drive member 29 connected to the rotating shaft of the motor through the power transmission mechanism and displaced according to the rotation of the rotating shaft of the motor; restriction means 43, 47 for defining the rotational range of the rotating shaft of the motor between an initial position and a driven position; and a spiral spring 41 provided to the rotating shaft of the motor and biasing the rotating shaft of the motor to the initial position. When electric power is supplied to the electric motor, the rotating shaft of the motor rotates to the driven position against the biasing force of the spiral spring, and when the supply of the electric power is stopped, the rotating shaft of the motor is biased by the biasing means and rotated to the initial position. |
