Original Position Detection Circuit - Canon CLC 1120 Service Manual

CHAPTER 4 IMAGE PROCESSING SYSTEM
E. Original Position Detection Circuit
The original position detection circuit is used to find out the size and position of an original on
the copyboard. It identifies an original as being a rectangle (or a square) possessing coordinates
X1/Y1 and X2/Y2 found on the ends of a diagonal line.
Volume 4>Chapter 4>IV-F "Detecting the Position of an Original"
Caution:
If an RDF is installed, the position of an original placed on the copyboard glass cannot be
checked.
4-8
COPYRIGHT © 1999 CANON INC.
(0,0)
X1
P1
Y1
Y2
Figure 4-405
CANON CLC1120/1130/1150 REV.0 MAR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
X2
P2
Copyboard