CHAPTER 4 LASER EXPOSURE SYSTEM
COPYRIGHT© 2002 CANON INC.
2000
CANON iR1600/iR2000/iR1610/iR2010 SERIES REV.0 MAR. 2002
4 - 4
2 Generating the Horizontal Signal
2.1 Outline
The laser emission start signal (horizontal sync) is used to direct laser light to the pho-
tosensitive drum. The sync signal is generated by the BD PCB based on the laser beam
reflected by the BD mirror mounted in the laser beam path.
2.2 Signals Used
[1] laser emission signal (LONO*). It is generated based on the BD input signal; laser is
emitted when it goes ‘0’.
[2] BD input signal (BDIN*). It goes ‘0’ upon detection of laser light.
[3] horizontal sync signal. It is generated based on the BD input signal.
[4] horizontal synch signal (BDO*). It is used to synchronize the video signals in laser
scanning direction in laser scanning direction.
[5] image data. It is read from image memory with reference to the horizontal sync sig-
nal.
[6] video signal (VDO, VDO*). It is used to form an image on the photosensitive drum.
Содержание iR1600 Series
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