Canon CLC1000 Service Manual page 72

c. Original Position Identification
The size of an original and its position on the copyboard are identified.
Figure 3-312
Figure 3-312 shows when a rectangular original is placed along the X axis (sub scanning direction) and
along the Y-axis (main scanning direction) on the copyboard. Figure 3-313 shows an original placed askew.
The underside of the copyboard (cover is mirror-finished (preventing refraction of light) instead of coat-
ed white as in the case of conventional copiers so that only the area where there is an original reflects the
light of the scanning lamp to the CCD.
l
Figure 3-314
In general, most originals are white paper so that the area identified as being white during scanning
can be assumed to represent an original.
In other words, a rectangle (or square) whose diagonal line runs between coordinates XminNmin and
If an original is placed at an angle as in the case of Figure 3-313, the rectangle whose diagonal line
runs between P and P2 will be identified as an original.
I
COPYRIGHT Q 1997 CANON INC.
X axis (sub scanning direction)
CANON CLClOOO REV.1 MAY 1997 PRINTEO IN JAPAN (IMPRIME AU JAPON)
3. OPERATIONS AND TIMING -
Figure 3-313
original
Area without
Figure 3-315