Patent ID: 6166749
Filing Date: 2000-12-26
Classification: H04N

Abstract:
An optical scanning system for a printer, comprising:a plurality of optical scanning units which scan lines in parallel onto a circulating photoreceptor belt;a plurality of photodetector for detecting light emitted from each optical scanning unit, to output pulse signals according to the detection;a mark sensor for detecting the pass of a mark formed in the photoreceptor belt at a set position, and for outputting a reference path detection signal according to the detection of the mark;a page synchronization signal generation unit for counting the number of pulse signals output from one selected photodetector in synchronism with the reference path detection signal input thereto, and for generating page synchronization signals for each optical scanning unit whenever the count value reaches a page synchronization target value for each optical scanning unit, the page synchronization target values have been set according to a point in time at which each page area set in the photoreceptor belt reaches the scanning position of each optical scanning unit; andan optical scanning control unit for controlling each optical scanning unit to scan image information using the page synchronization signals.