Patent ID: 8866865

Claim:
An image forming apparatus comprising: a light source that emits light beams for scanning a photoconductive element and for image forming of image data; a storage unit that stores a correction amount of a turn-on time of the light source associated with a preset turn-on pattern of the light beams; an acquiring unit that compares a pattern of the image data with the turn-on pattern, so as to acquire the correction amount corresponding to the pattern of the image data which is associated with the turn-on pattern, from the storage unit; a light source controller that controls turn-on of the light source by a turn-on time corrected with acquired correction amount; a light amount detector configured to detect an integrated light amount of the light beams emitted from the light source for each turn-on pattern, the light source being a VCSEL having a plurality of light sources, which collectively are detected and subsequently corrected; and a calculating unit configured to calculate a turn-on time of the light source, as the correction amount, corresponding to a difference between detected integrated light amount and an integrated target light amount which is an integral of target light amounts, each of which is a preset target value of the light amount of the light source, and stores calculated turn-on time in the storage unit.