| 摘要 |
A two-dimensional light scanning apparatus configured to deflect light from a light source and repeatedly scan the light in a predetermined pattern includes: 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 deflector drive control part configured to control driving of the deflector; a position sensor configured to detect a scanning position of the deflector; and a resonance frequency predicting part configured to predict the resonance frequency of the deflector, based on position information obtained from the position sensor. The deflector drive control part is further 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. |
