Patent ID: 7123400

Claim:
A light deflector comprising: a first movable plate having a reflective surface; fixing portions; a pair of second movable plates located between the first movable plate and the fixing portions; a pair of first elastic members supporting the first movable plate so as to allow the first movable plate to oscillate with respect to the second movable plates; a pair of second elastic members supporting the second movable plates so as to allow the second movable plates to oscillate with respect to the fixing portions, oscillation axis of the first elastic members and oscillation axis of the second elastic members being located on the same axis, and stiffness of the second elastic members against oscillation being lower than stiffness of the first elastic members against oscillation; and actuating means for oscillating the first movable plate; wherein a total moment of inertia about the oscillation axis of the pair of second movable plates is equal to or greater than a moment of inertia about an oscillation axis of the first movable plate.