Patent ID: 8587162
Filing Date: 2013-11-19
Classification: A61C,H02K

Abstract:
1. An actuator comprising: an outer yoke having inner wall planes opposing each other, the inner wall planes being placed a predetermined interval apart; a permanent magnet that has different magnetic pole planes facing the inner wall planes respectively over air gaps therebetween; a coil that is placed through the air gaps and surrounds the permanent magnet; a fixed body that has one of the permanent magnet or the coil; a movable body that has the other one of the permanent magnet or the coil and that has an output shaft that is perpendicular to both a direction in which the magnetic pole planes and the inner wall planes face each other and an axial direction of winding of the coil; an alternating current supplying section that supplies an alternating current to the coil, the alternating current having a frequency substantially the same as a resonance frequency of the movable body; and one coil spring that is placed between a rear wall part of the fixed body and a rear wall part of the movable body and that has an end fixed to the fixed body and another end fixed to the movable body, and that supports the movable body on the fixed body in such a way that the movable body is able to rotate about an axis along the output shaft, wherein the coil spring connects the fixed body and the movable body in such a way that an axial center of a winding part in the coil spring is substantially matches an axial center of the output shaft, and wherein the movable body is supported via the coil spring in such a way that the movable body is able to move in a twisting direction of the output shaft.