Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1998-08-04
2000-03-28
Le, Que T.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
347235, H01J 314
Patent
active
060434848
ABSTRACT:
An optical scanning apparatus includes an optical scanning unit, a photodetector, a belt position identifying portion for counting a pulse maintenance time corresponding to the width of the pulse signal output from the 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 during the 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 input pulse, and a scanning controlling portion for controlling the driving of the optical scanning unit such that scanning corresponding to image information is initialized by the optical scanning unit in synchronization with the image scanning start signal. A color printer optical scanning system wherein each of the optical scanning controllers of the other optical scanning apparatuses include a register for storing the delay time information output from the scanning delay determining portion, a scanning start instructing portion for counting the time corresponding to the delay time information output from the register from the end of the pulse signal output from the corresponding photodetector occurs and outputting an image scanning start signal, and a scanning controlling portion for controlling the driving of the optical scanning unit such that scanning corresponding to image information is initialized by the optical scanning unit in synchronization with the image scanning start signal. With this apparatus and system, an image in which constant marginal spaces are maintained on paper can be obtained, regardless of a degree of slipping of the photoreceptor belt.
REFERENCES:
patent: 5255063 (1993-10-01), Ideyama et al.
Le Que T.
Samsung Electronics Co,. Ltd.
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