COPYRIGHT © 1999 CANON INC. CANON GP160 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 5 LASER EXPOSURE SYSTEM
5-3
II. BD SIGNAL GENERATION
A.
Overview
When the laser is illuminated onto the photosensitive drum, a laser emission start
signal (horizontal sync. signal) is necessary. The laser beam sensor signal is used to
generate this start signal.
B.
BD generation / detection
The DC controller PCB CPU outputs the laser forced light signal (LON*) at “0”,
based on the BDI* signal, and forcibly emits the laser. The laser beam is reflected by the
BD mirror and then input in the BD sensor PCB. BD sensor PCB detects this laser beam
and generates a BD input signal (BDI*), then sends it to the DC controller PCB CPU
(IC301). The CPU (IC301) generates a horizontal sync. signal (BDO*) based on the
BDI* signal, and outputs it to the image processor PCB.
Figure 5-201
BD sensor PCB
BD mirror
Laser
Collimator lens
Polygon mirror
(6 sided)
Photosensitive drum
Laser scanner unit
Front
Back
DC controller PCB
Image processor
PCB
BD input signal (BDI)
Horizontal sync.
signal (BDO)
Laser forced light emission signal (LON*)
Summary of Contents for GP160
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