Patent ID: 7408690
Filing Date: 2008-08-05
Classification: G02B,H01F,H02K

Abstract:
1. An actuator comprising: a frame-shaped first mass portion; a supporting portion for supporting the first mass portion, the supporting portion taking a shape of a frame so as to surround a perimeter of the first mass portion; a pair of first elastic portions coupling between the first mass portion and the supporting portion so that the first mass portion is supported by the supporting portion; a second mass portion provided inside the frame-shaped first mass portion; a pair of second elastic portions coupling between the second mass portion and the first mass portion so that the second mass portion is supported by the first mass portion; and a driver for rotating the first mass portion, the driver including: an operation of the voltage application unit included in the driver causes the coil to generate a magnetic field; the generation of the magnetic field causes displacement of the ferromagnet relative to the coil; the displacement of the ferromagnet causes the first mass portion to rotate while torsionally deforming the pair of first elastic portions; and the rotation of the first mass portion causes the second mass portion to rotate while torsionally deforming the pair of second elastic portions.