Patent ID: 6429424
Filing Date: 2002-08-06
Classification: G02B,H04N

Abstract:
An optical scanning system of a printer, comprising:an optical scanning unit including a light source, a rotating polygonal mirror having a plurality of mirror surfaces for deflecting light emitted from the light source toward a photoreceptor web, and a driving source for driving the rotating polygonal mirror; a photodetector installed to receive light scanned by the optical scanning unit to a position off the photoreceptor web and to output pulse signals; and a controller which controls a scanning start point of image data for lines by the optical scanning unit by obtaining information on addresses of the mirror surfaces of the rotating polygonal mirror while counting the number of the pulse signals output from the photodetector corresponding to the light received thereby, and which applies a line scanning synchronization correction time corresponding to the mirror surface address information with respect to a light receiving termination point of a corresponding one of the pulse signals output from the photodetector with respect to a corresponding one of the mirror surfaces, to correct a line scanning synchronization time according to the difference in the amount of light reflected from each mirror surface of the rotating polygonal mirror.