Patent ID: 8643923
Filing Date: 2014-02-04
Classification: G02B,H04N

Abstract:
1. An optical scanning device comprising: a first scanning mirror which is supported to be able to oscillate; a first scanning mirror driving unit which drives the first scanning mirror so as to oscillate; a light emission signal output unit which outputs to a laser light source a light emission signal causing the laser light source to emit a laser beam, during a period of time taken for reflected light of a laser beam irradiated toward the first scanning mirror to complete one back-and-forth scan corresponding to oscillation of the first scanning mirror; a light receiving unit which is arranged at a position of receiving light when the reflected light scans an end of a scanning line, the end being in a range of scanning by the reflected light of the laser beam irradiated toward the first scanning mirror corresponding to the oscillation of the first scanning mirror, the light receiving unit outputting a detection signal upon receipt of the reflected light; and a phase control unit which controls the first scanning mirror driving unit so as to delay a phase of the oscillation of the first scanning mirror when the light receiving unit outputs the detection signal before intermediate time in a case where the light receiving unit does not output the detection signal during a predetermined period of time, the predetermined period of time being before and after the intermediate time between time when the light emission signal output unit started outputting the light emission signal and time when the light emission signal output unit ceased outputting the light emission signal, the phase control unit controlling the first scanning mirror driving unit so as to advance a phase of the oscillation of the first scanning mirror when the light receiving unit outputs the detection signal after the intermediate time in the case where the light receiving unit does not output the detection signal during the predetermined period of time.