Patent ID: 6204865
Filing Date: 2001-03-20
Classification: G06K,H04N

Abstract:
An image forming apparatus comprising:a rotary polygon for forming a latent image on an image carrier by scanning said image carrier, which moves in a sub-scanning direction, in a main scanning direction using a light beam modulated based on image data;first generation means for generating a first timing signal by detecting the light beam that has scanned a predetermined position;second generation means for generating a second timing signal independently of the detection of the light beam, a generation period of the second timing signal being different from a proper generation period of the first timing signal;turn-on control means for turning on the light beam, for a predetermined period of main scanning according to the second timing signal, during a period preceding modulation of the light beam based on the image data; anddriving control means for controlling driving of said image carrier in the sub-scanning direction by first using the second timing signal and thereafter using the first timing signal to move said image carrier.