Patent ID: 8412075

Claim:
A light deflector device comprising: a light source; a light deflector for deflecting light from the light source; and a photodetector for detecting information relating to a deflection angle of scanning light deflected by the light deflector, the light deflector having: a support portion; an oscillation system including at least a first oscillating body, a first elastic support portion supporting the first oscillating body so as to make it able to oscillate relative to the support portion around an axis of oscillation, a second oscillating body and a second elastic support portion supporting the second oscillating body so as to make it able to oscillate relative to the first oscillating body around the same axis as the axis of oscillation of the first oscillating body; a driving unit for applying a torque to at least either the first oscillating body or the second oscillating body; and a drive controlling unit for supplying a drive signal to the driving unit, wherein a light deflecting element is formed at least on one surface of at least either the first oscillating body or the second oscillating body, the oscillation system is adapted to be able to simultaneously generate a first oscillating motion of moving at a first frequency, the first frequency being a fundamental frequency, and a second oscillating motion of moving at a second frequency, the second frequency being a frequency of integer times of the fundamental frequency, and the drive controlling unit is adapted to supply a drive signal formed by synthetically combining a first signal having the first frequency and a second signal having the second frequency to the driving unit and, at the same time, supply another drive signal for changing at least the amplitude of the first oscillating motion, the amplitude of the second oscillating motion or the relative phase difference of the first oscillating motion and the second oscillating motion to the driving unit in order to correct an offset of scanning light deflected by the light deflector.