ACTUATOR AND ELECTRIC BEAUTY APPLIANCE

摘要

An actuator includes a movable body including a cylindrical magnet portion, an immovable body including pole tooth faces and a coil, and a torsion coil spring supporting a movable body to the immovable body. The coil receives an alternating current of a frequency substantially equal to a resonance frequency of the movable body and excites the pole tooth faces to have alternately different polarities in the circumferential direction. One end of the torsion coil spring is fixed to one end of a rotary shaft of the movable body and other end is fixed to the immovable body. The torsion direction of the torsion coil spring is arranged to be coaxial with the rotary shaft. The torsion coil spring supports the movable body to enable the movable body to vibrate at the resonance frequency of the movable body.

主权项

1. An actuator comprising:
a movable body including a cylindrical magnet portion having on an inner circumferential surface thereof alternating N pole faces and S pole faces along a circumferential direction thereof; an immovable body including an outer circumferential surface facing the inner circumferential surface of the magnet portion, pole tooth faces arranged in the outer circumferential surface along the circumferential direction, and a coil configured to excite the pole tooth faces; and a torsion coil spring that supports the movable body to the immovable body in a reciprocally rotatable manner about a rotary shaft which is a part of the movable body and biases the movable body to a rotation neutral position, wherein the coil receives an alternating current of a frequency substantially equal to a resonance frequency of the movable body that is determined by an inertia of the movable body and the spring constant in a torsion direction of the torsion coil spring to excite the pole tooth faces to have alternately different polarities in the circumferential direction, wherein one end of the torsion coil spring is fixed to one end of the rotary shaft of the movable body, the other end is fixed to the immovable body, the torsion direction of the torsion coil spring is arranged to be coaxial with the rotary shaft, and the torsion coil spring supports the movable body to enable the movable body to vibrate at the resonance frequency of the movable body.