| 摘要 |
An optical scanning system for a printer. The optical scanning system includes: an optical scanning unit installed to scan light onto a circulating photoreceptor web; a photodetector installed for receiving scanning light emitted from the optical scanning unit; a defective edge area detector for comparing pulse signals output in sequence from the photodetector to determine whether the edge of the photoreceptor web has a defect, and outputting an edge defect signal if a defective area is detected; an estimated pulse width calculator for outputting a predetermined estimated pulse width, and updating the estimated pulse width for the next line image scanning using the signal from the defective edge area detector, the predetermined estimated pulse width, and the pulse signal from the photodetector; a line scanning synchronous signal generator for generating a line scanning synchronous signal in synchronicity with the predetermined estimated pulse width; and an optical scanning unit driver for driving the optical scanning unit such that the optical scanning unit emits image information light onto the photoreceptor web synchronized with the line scanning synchronous signal. By the optical scanning system and a method for adjusting the start point of image scanning, errors in writing an image can be suppressed, which are caused by defects at the edge of the photoreceptor web.
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