Patent ID: 8130435

Claim:
An optical scanner comprising: an optical source unit that emits a laser beam; a vibration mirror by which the laser beam from the optical source unit is deflected to scan; a driving unit that vibrates the vibration mirror based on an input driving signal generated from a reference clock; a controlling unit that corrects the driving signal so as to cancel a phase variation of an actual amplitude waveform of the vibration mirror relative to an ideal amplitude waveform of the vibration mirror based on the driving signal; and a light-receiving element that receives the laser beam within a scanning area of the laser beam, wherein the controlling unit corrects the driving signal so as to make a phase deviation between the reference clock and an output signal of the light-receiving element constant, thereby controlling a phase of an amplitude waveform of the vibration mirror, and wherein the driving signal is corrected such that the phase deviation of one of two outputs of the output signal of the light-receiving element for a given time interval is selected, for use in correction of the driving signal, at a time right before forming an image.