CHAPTER 5 LASER EXPOSURE SYSTEM
5-4
COPYRIGHT © 1999 CANON INC. CANON CLC1120/1130/1150 REV.0 MAR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
III.
LASER DRIVER CIRCUIT
A. Controlling the Laser System
The laser driver circuit converts video signals (VD0 to VD7) into laser intensity control signals
used to drive the semiconductor laser.
The laser driver circuit has the following functions:
1.
Controlling laser emission.
2.
Controlling the laser intensity (APC control).
3.
Switching laser outputs.
Each of the signals has the following function:
1.
PH/TX/h200 (switch signal to suit copying mode)
Serves to switch resolutions in main scanning direction (i.e., to suit text output or photo
output; in sub scanning direction, it is fixed to 400 dpi).
2.
PVE (sync signal)
Serves as the sync signal when transmitting video signals.
3.
400* Signal
Serves to select 400 dpi when ‘1’.
Figure 5-301
VD0-VD7
VCLK
PH/TX/H200
PVE
BD
8
ITOP
400*
APCHOLD
L-ON
L-RDY
VR1
VR2
[1]
[2]
[3]
[4]
[5]
[6]
CPU Bus
TH
H
8
Image
processor
PCB
Laser
controller
PCB
Laser driver PCB
Control
panel
Laser
intensity
control
circuit
Laser
driver
circuit
CPU PCB
Laser
intensity
correction
circuit
Laser
limiter
circuit
Содержание CLC 1120
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