Optical scanning device and image forming apparatus

摘要

An optical scanning device includes a MEMS mirror, a driving unit for oscillating the MEMS mirror using a drive voltage which varies in a basic cycle, a light detection unit for receiving laser light deflected by the MEMS mirror and outputting a detection signal, a correction value calculation unit for calculating a correction voltage value used in correcting the drive voltage, a DC voltage generation unit for generating a DC voltage having a voltage value smaller than the correction voltage value, a DC voltage amplification unit for amplifying the DC voltage generated by the DC voltage generation unit to have a voltage value equal to the correction voltage value, and a waveform shaping unit for shaping the waveform of the amplified DC voltage so that the DC voltage varies in the basic cycle and outputting the shaped DC voltage as the drive voltage to the driving unit.

主权项

1. An optical scanning device, comprising:
a light source; a MEMS mirror for deflecting laser light output from the light source; a driving unit for pivoting the MEMS mirror using a drive voltage which varies in a predetermined basic cycle; a light detection unit for receiving the laser light deflected by the MEMS mirror at a predetermined position and outputting a detection signal indicating light reception; a correction value calculation unit for calculating a correction voltage value, which is a voltage value used in correcting the drive voltage to compensate for a change in a deflection angle of the MEMS mirror, based on an output timing of the detection signal by the light detection unit; a DC voltage generation unit for generating a DC voltage having a voltage value smaller than the correction voltage value; a DC voltage amplification unit for amplifying the DC voltage generated by the DC voltage generation unit to have a voltage value equal to the correction voltage value; and a waveform shaping unit for shaping the waveform of the DC voltage amplified by the DC voltage amplification unit so that the DC voltage varies in the basic cycle and outputting the shaped DC voltage as the drive voltage to the driving unit.