Patent ID: 6043484
Filing Date: 2000-03-28
Classification: G02B

Abstract:
An optical scanning apparatus comprising:an optical scanning unit for scanning a ray of light to a circulating photoreceptor belt;a photodetector arranged to detect the ray of light scanned by said optical scanning unit from a predetermined position beyond said photoreceptor belt to the edge thereof and output an electric pulse signal corresponding to the scanned light;a belt position identifying portion for counting a pulse maintenance time corresponding to the width of the pulse signal output from said photodetector in response to the input light and outputting the counted time;a scanning delay determining portion for outputting delay time information corresponding to the result of subtracting the pulse maintenance time from a set image scanning initialization delay time during a time from the beginning of the pulse until image scanning is initialized;a scanning start instructing portion for outputting an image scanning start signal after counting the delay time from the end of the pulse signal; anda scanning controlling portion for controlling the driving of said optical scanning unit such that scanning corresponding to image information is initialized by said optical scanning unit in synchronization with said image scanning start signal.