Patent ID: 7369151

Claim:
A laser control circuit, comprising: a clock generation circuit which generates a reference clock signal; a synchronous circuit which supplies a first clock synchronized with a horizontal synchronous signal from a beam detection circuit detecting a light beam scanned in a main scanning direction and supplying the horizontal synchronous signal on a basis of the reference clock signal; a delay circuit which supplies a second clock obtained by delaying the first clock by a half period; and a first pulse width modulation circuit which outputs a pulse having a width corresponding to image data of an odd pixel output from an image data processing section in synchronization with the first clock on a basis of at least one of first and second reference positions, the image data processing section being constituted to subject input image data to image processing and to output image data of odd pixel and even pixel in parallel; a second pulse width modulation circuit which outputs a pulse having a width corresponding to the image data of the even pixel output from the image data processing section in synchronization with the second clock on a basis of at least one of first and second reference positions; and a synthesis circuit which synthesizes the pulses output from the first and second pulse width modulation circuits.