Patent ID: 7746370

Claim:
An image forming apparatus comprising: a photosensitive member; a laser light source that irradiates a laser light for forming an electrostatic latent image on the photosensitive member, based on a driving signal; a deflecting-scanning unit that deflects and scans the laser light irradiated by the laser light source onto the photosensitive member; a storage unit that stores correction data for correcting an amount of laser light irradiated by the laser light source or a time period of irradiating the laser light by the laser light source, wherein the correction data includes a plurality of items of correction data, each item corresponding to each of a plurality of blocks into which one scanning interval of the laser light is divided; a detection unit that detects the laser light deflected and scanned by the deflecting-scanning unit; a counter unit that counts a reference clock generated during scanning of the laser light to generate a count signal corresponding to a current block in which the laser light is scanning, in response to the detection unit detecting the laser light; a correction unit that reads out, based on the count signal generated by the count unit, first correction data corresponding to the current block and second correction data corresponding to an immediately preceding block to the current block from the storage unit, and corrects the driving signal for driving the laser light source based on the first and second correction data to irradiate the current block with the laser light; and a driving unit that drives the laser light source in accordance with the driving signal corrected by the correction unit.