Canon IR3300, IR2800, IR2200 manual Outline of Detection Operation, F02-404-01, 12 R

CHAPTER 2 ORIGINAL EXPOSURE SYSTEM

4.4 Outline of Detection Operation

4.4.1 Book Mode, 1 Original, Copyboard Cover Open

Xenon lamp

Copyboard cover

Reader unit

Original sensor

Point of original detection 1

Point of original detection 2 Point of original detection 3 Point of original detection 4

Copyboard glass

Point of original detection

[1]The scanner remains in wait. No. 1 mirror base: at HP Xenon lamp: off

Original sensor: disabled

(external light)

Original (A4R)

(external light)

F02-404-01

[2] The copyboard is opened.

Detection starts of external light in main scanning direction.

No. 1 mirror base: to point of original de- tection

Xenon lamp: off

Original sensor: disabled

[3] An original is placed.

The width of the original is identified in relation to the presence/absence of external light; here, the absence of an original is identified at points in question, eliminating B5, B4, A4, and A3.

[4] The Start key is pressed.

In response, original detection is started. For main scanning direction, the xenon lamp is turned on to check for reflected light by the CCD (4 points).

For sub scanning direction, the original sensor starts detection.

The absence of external light is identified as indicating the absence of an original. The machine will identify the size of an original based on the combination of the results (T02-404-01)

2-12 R COPYRIGHT © 2001 CANON INC. CANON iR2200/iR2800/iR3300 REV.0 MAR. 2001