Patent ID: 6211987
Filing Date: 2001-04-03
Classification: H04N

Abstract:
An optical scanning system, comprising:an optical scanning unit for scanning light onto an image print region of a photosensitive belt;a photodetector disposed at an edge of the photosensitive belt for receiving light emitted from the optical scanning unit, and for outputting a pulse signal in response to the received light;a belt position calculator for counting a hold time of the pulse signal output from the photodetector in order to calculate an edge point of the photosensitive belt;a memory for storing information about a delay time from an end point of the pulse signal to a point in time at which the optical scanning unit starts scanning light onto a start point of the image print region of the photosensitive belt;a delay time setting unit for accessing the memory in order to locate delay time information, corresponding to the edge point of the photosensitive belt, output from the belt position calculator;a scanning start signal generator for counting a time duration corresponding to the delay time information output from the delay time setting unit, and for outputting a scanning start signal in accordance therewith; anda scanning controller for controlling the optical scanning unit such that the optical scanning unit emits light corresponding to an image signal in synchronism with the scanning start signal.