Patent ID: 6477656
Filing Date: 2002-11-05
Classification: H04N

Abstract:
An image forming apparatus, comprising:an image forming device to scan in a main scanning direction in synchronization with dot clock pulses for each scanning line so as to form an image; a basic clock pulse generating section to generate basic lock pulses with a predetermined interval; a delayed clock pulse generating section to generate a group of plural delayed clock pulses having different phases respectively by delaying the basic clock pulse generate by the basic clock pulse generating section into plural delay stages; a synchronism detecting section to detect at least two delayed clock pulses synchronizing with an index signal from the plural delayed clock pulses generated by said delayed clock pulse generating section; a calculating section to calculate a number of delay stages existing within a given time period on the basis of the two synchronizing delayed clock pulses detected by the synchronism detecting section; and a clock pulse control section to select the delayed clock pulses sequentially delayed from the synchronizing delayed clock pulse from the group of plural delayed clock pulses within a predetermined time period on the basis of the calculated number of delay stages so as to control a number of clock pulses outputted as the dot clock pulses during the predetermined time period.