Patent ID: 7433074
Filing Date: 2008-10-07
Classification: G02B,H04N

Abstract:
1. An image forming apparatus comprising: an image carrier; an emitting device that emits a laser beam for forming a latent image on said image carrier; a setting device that sets a modulation coefficient for each of a plurality of segments obtained by dividing a main scan line on said image carrier scanned by the emitted laser beam; an image clock generating device that generates an image clock signal for controlling emission by said emitting device for each of the segments, based on the modulation coefficient of the corresponding segment set by said setting device; a starting end detecting device that detects a starting end of the main scan line; a terminating end detecting device that detects a terminating end of the main scan line; a phase difference detecting device that detects a difference in phase between timing of detection of the terminating end by said terminating end detecting device and timing of generation of a last image clock signal for a last segment by said image clock generating device; and a correction device that corrects the modulation coefficient for at least some of the segments based on the phase difference detected by said phase difference detecting device.