Patent ID: 7224507
Filing Date: 2007-05-29
Classification: G02B

Abstract:
1. An electromagnetically actuated optical deflector comprising: a magnet unit, which generates a magnetic field; and a movable plate unit, which is placed in the magnetic field, the movable plate unit having an inner movable plate having a reflecting surface, an outer movable plate located outside the inner movable plate, two inner torsion bars connecting the inner movable plate and the outer movable plate, a support located outside the outer movable plate, and two outer torsion bars connecting the outer movable plate and the support, the inner torsion bars extending along a first axis and being capable of twisting about the first axis so as to allow the inner movable plate to tilt about the first axis with respect to the outer movable plate, the outer torsion bars extending along a second axis perpendicular to the first axis and being capable of twisting about the second axis so as to allow the outer movable plate to tilt about the second axis with respect to the support, the movable plate unit further having two inner wirings extending on the inner movable plate, the inner torsion bars, the outer movable plate, the outer torsion bars, and the support, the two inner wirings being provided independently of each other so as to be electrically isolated from each other, one of the inner wirings passing through one of the outer torsion bars, the other of the inner wirings passing through the other of the outer torsion bars, each of the two inner wirings having an inner drive wiring portion that extends along by a periphery of the inner movable plate, and two inner extracted wiring portions extending from two ends of the inner drive wiring portion, the two inner drive wiring portions being located substantially line-symmetrically with respect to the first axis, and the two inner extracted wiring portions extending from the two ends of each of the inner drive wiring portions being located substantially line-symmetrically with respect to the second axis, and currents of the same direction being applied to the two inner drive wiring portions along the first axis.