Patent ID: 8922845

Claim:
An image forming apparatus comprising: a photosensitive body; an exposing section including a light source that emits a light beam and configured to scan, in a main scanning direction, the light beam emitted by the light source to render a main scanning line on the photosensitive body; a pulse generating section configured to generate a periodic pulse signal indicating a light amount of the light beam emitted by the light source; a frequency storing section configured to store in advance a plurality of frequencies of the pulse signal; an emission control section configured to select, in the rendering of each main scanning line, any one of the plurality of frequencies stored in the frequency storing section and instruct the pulse generating section to generate the pulse signal having the selected frequency; a smoothing section configured to smooth the pulse signal generated by the pulse generating section according to the instruction of the emission control section and generate an analog signal; and a driving-current generating section configured to generate a driving current for the light source on the basis of the analog signal generated by the smoothing section.