Canon IR2800, IR3300, IR2200 manual Outline of Operations

CHAPTER 2 ORIGINAL EXPOSURE SYSTEM

1 Outline of Operations

1.1 Outline

The major functions of the original exposure system are as follows:

Item		Description
Scanning lamp	Xenon lamp
Original Scanning	In book mode: by moving the scanner.
	With ADF in use: by stream reading while holding the No. 1
	mirror base fixed in position.
Scanner position detection	By scanner HP sensor (PS400)
Reproduction ratio (zoom)	[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).
Scanner drive control	The No.1/No.2 mirror base is controlled by means of a step-
	ping motor (M400).
Lens	Lens array (fixed in position)
Scanning lamp activation	[1]	Turned on by an inverter circuit.
	[2]	Monitored for errors.
Original size detection	[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.

COPYRIGHT © 2001 CANON INC. CANON iR2200/iR2800/iR3300 REV.0 MAR. 2001 2-1 R