Patent ID: 8259148

Claim:
An image forming apparatus comprising: an exposure section having a plurality of light sources; a light source position shift measuring section which measures a position shift of the plurality of light sources in a main scanning direction by using light reception signals when the plurality of light sources are made to emit light at prescribed timing; a synchronized INDEX signal generating section which generates synchronized INDEX signals in which writing timing of each of the plurality of light sources has been adjusted according to the position shift; a light source driving signal generating section which generates light source driving signals based on the synchronized INDEX signals and image data; and a timing shift measuring section which detects a timing shift component in the main scanning direction which is included in the synchronized INDEX signals generated in the synchronized INDEX signal generating section in a condition in which the synchronized INDEX signals have been adjusted in accordance with the position shift, wherein the synchronized INDEX signal generating section carries out further shift correction in the main scanning direction based on the timing shift component, for the synchronized INDEX signals which are generated in the synchronized INDEX signal generating section by being adjusted according to the position shift of the plurality of light sources.