Patent ID: 8327488

Claim:
An actuator comprising: a movable body that comprises: an outer yoke, which comprises inner wall planes located opposing each other spaced a predetermined interval apart, and in which magnets of different magnetic poles are provided opposing each other in the opposing inner wall planes; and a magnetic body located between the magnets through air gaps; an output shaft provided in the movable body; a fixed body that comprises a coil which is located in the air gaps and which encircles the magnetic body; an elastic support part that movably supports the movable body in the fixed body; and an alternating current supplying section that supplies to the coil an alternating current of a frequency substantially equal to a resonance frequency of the movable body, wherein the movable body is supported through the elastic support part by the fixed body at an end orthogonal to an inner wall plane of the movable body, and the movable body moves in a twisting direction of the magnetic body and the output shaft during actuation of the actuator.