Patent ID: 8358326

Claim:
A two-dimensional light scanning apparatus configured to deflect light from a light source and repeatedly scan the light in a predetermined pattern, the apparatus comprising: a deflector configured to drive at a resonance frequency in a main scanning direction and a sub-scanning direction different from the main scanning direction; a position sensor configured to detect a scanning position of the deflector; a resonance frequency predicting part configured to predict the resonance frequency of the deflector, based on position information obtained from the position sensor; and a deflector drive control part configured to: for drawing a Lissajous figure in which scanning trajectories of the deflector do not overlap with each other for one frame, store a plurality of pairs of respective frequency ratios of driving signals in the sub-scanning direction to driving signals in the main scanning direction, and respective phases of the driving signals in the sub-scanning direction with respect to the driving signals in the main scanning direction; select one pair of a frequency ratio and a phase from among the pairs of the respective frequency ratios and the respective phases, based on the resonance frequency predicted by the resonance frequency predicting part; and control the deflector with a driving signal based on the selected pair of the frequency ratio and the phase.