Patent ID: 6529222
Filing Date: 2003-03-04
Classification: G02B,H04N

Abstract:
An optical scanning system for a printer comprising:an optical scanner for scanning light onto a circulating photoreceptor web; a photodetector for receiving scanning light emitted from said optical scanner off an edge of the photoreceptor web, said photodetector outputting pulse signals corresponding to the light received; a defective edge area detector for comparing said pulse signals in sequence to determine whether the edge of the photoreceptor web has a defect, said defective edge area detector outputting an edge defect signal if a defective area is detected at the edge of the photoreceptor web; an estimated pulse width calculator for outputting a predetermined estimated pulse width, and updating an estimated pulse width for a next line image scanning, said predetermined estimated pulse width, and said pulse signals from the photodetector; a line scanning synchronous signal generator for generating a line scanning synchronous signal in synchronism with said predetermined estimated pulse width; and an optical scanner driver for driving the optical scanner such that the optical scanner emits light onto said photoreceptor web, said optical scanner driver being synchronized with the line scanning synchronous signal.