JPH03129961U - - Google Patents

Description

[Brief explanation of drawings]

Figures 1 to 4 are for explaining one embodiment of the present invention, of which Figure 1 is a configuration diagram showing an outline of a multicolor laser printer, and Figure 2 is a configuration diagram of a video data output device. FIG. 3 is a block diagram showing signals output from each part of the video data output device when the mounting positions of the first light beam detector and the second light beam detector in the main scanning direction are the same. Figure 4 is a timing diagram showing the timing from each part of the video data output device when the mounting position of the second light beam detector is shifted to the front in the main scanning direction compared to the first light beam detector. FIG. 5 is a timing diagram showing the timing of output signals, and is a configuration diagram for explaining a conventional multicolor laser printer. 11...First laser device, 12...Second laser device, 13...First laser beam, 15...
...Rotating polygon mirror, 16...Photosensitive drum, 21...
Video data output device, 22...first video data, 23...second laser beam, 27...second video data, 30...first light beam detector, 31...second light Beam detector, 37...first clock oscillator, 38...second clock oscillator, 41...first mask section, 42...first mask amount information, 46...second mask section, 47...
...Second mask amount information, 53...Video data buffer.

Claims (1)

[Claims for Utility Model Registration] A plurality of laser beam generation means for generating laser beams; a plurality of modulation means for modulating each laser beam generated from the plurality of laser beam generation means based on video data; a deflection means for deflecting and scanning the laser beam; a photoreceptor on which the plurality of laser beams deflected by the deflection means are scanned at a plurality of different main scanning positions; and a line perpendicular to the main scanning direction of the laser beam. and the plurality of main scanning positions, the plurality of light beam detectors detecting the start of scanning on the photoreceptor by the laser beam scanning each main scanning position and outputting a start signal. and a clock signal output means for outputting a clock signal as a synchronization signal for supplying video data to the plurality of modulation means in response to input of a start signal from the light beam detector, and a clock signal output means corresponding to the plurality of modulation means. a plurality of mask means for masking the first predetermined clock of the clock signal outputted from the clock signal output means by at least an amount that absorbs the mounting error of the light beam detector in the main scanning direction; 1. A multicolor laser printer comprising a masking amount variable means for varying the number of clocks for masking a clock signal for at least one masking means but the remaining masking means.