Patent ID: 8618701
Filing Date: 2013-12-31
Classification: A61C,H02K

Abstract:
1. An actuator comprising: a permanent magnet that has magnetic pole planes of different poles; an outer yoke that has inner wall planes opposing each other and facing the magnetic pole planes with a predetermined interval therebetween respectively; a coil that is placed through the interval and surrounds the permanent magnet; a movable body that has one of the permanent magnet or the coil; a fixed body that has the other one of the permanent magnet or the coil, and the outer yoke, and supports the movable body in a movable fashion via an elastic support part; and an alternating current supplying part that supplies an alternating current to the coil, alternating current having a frequency substantially the same as a resonance frequency of the movable body, wherein the movable body has an output shaft that is substantially parallel to the different magnetic pole planes of the permanent magnet and placed approximately at a center of the permanent magnet, and is supported by the elastic member part in such a way that the movable body moves in a twisting direction about the output shaft.