Filter
Top Products
COPYRIGHT
©
2001 CANON INC. 2000 2000 2000 2000 CANON iR2200/iR2800/iR3300 REV.0 MAR. 2001
CHAPTER 2 ORIGINAL EXPOSURE SYSTEM
2-1 R
Item
Scanning lamp
Original Scanning
Scanner position detection
Reproduction ratio (zoom)
Scanner drive control
Lens
Scanning lamp activation
Original size detection
1 Outline of Operations
1.1 Outline
The major functions of the original exposure system are as follows:
Description
Xenon lamp
In book mode: by moving the scanner.
With ADF in use: by stream reading while holding the No. 1
mirror base fixed in position.
By scanner HP sensor (PS400)
[1] Using the Copyboard: 25% to 800%
• In main scanning direction, image processing is per-
formed by the controller unit.
• In sub scanning direction, the speed of the No. 1 mirror
base is changed (50% or higher and lower than 400%),
in addition, the image data is processed by the control-
ler unit (lower than 50% and 400% or higher).
[2] Using the ADF: 25% to 200%
• In main scanning direction, the image data is processed
by the controller unit.
• In sub scanning direction, the speed at which the origi-
nals are moved is changed (50% or higher and lower
than 200%), in addition, the image data is processed by
the controller unit (lower than 50%and 200% or
higher).
The No.1/No.2 mirror base is controlled by means of a step-
ping motor (M400).
Lens array (fixed in position)
[1] Turned on by an inverter circuit.
[2] Monitored for errors.
[1] In book mode, by a reflection type sensor in sub scan-
ning direction; by a CCD in main scanning direction.
[2] With the ADF in use, by the ADF.