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COPYRIGHT
©
2001 CANON INC. 2000 2000 2000 2000 CANON iR2200/iR2800/iR3300 REV.0 MAR. 2001
CHAPTER 3 LASER EXPOSURE SYSTEM
3-1 P
1 Outline of Operations
1.1 Outline
Part 2>Chapter 4>1.1 “Outline of Laser Exposure System”
The reader controller PCB serves to read image signals from the CCD and send image
signals to the main controller assembly. The video signals from the main controller assem-
bly are converted by the DC controller PCB into laser drive signals, and are turned into laser
intensity signals to suit signal levels by the laser driver PCB.
The laser intensity signals are used to cause the laser unit to generate a laser beam, which
is directed to the photosensitive drum for the formation of latent static images.
Item Description
Laser intensity control Laser power auto control (APC control)
Laser scanning By semiconductor laser
Synchronization control Main scanning direction: control by BD signal
Sub scanning direction: control by image leading edge signal
Laser scanner motor control Constant speed rotation control
T03-101-01