COPYRIGHT © 2001 CANON INC. CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
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3. OPERATION AND TIMING
The pattern on the transfer belt is exposed by a LED and read by a special CCD.
Figure 3-424
The image data is sent to the DC controller, and a histogram (Figure 3-425) is prepared for both main
and sub scanning directions. The coordinates of the center of the pattern is computed based on the data. In
the case of Figure 3-425, the center in the main scanning direction is the 128th pixel and that in the sub
scanning direction is the 130th line.
Figure 3-425
DC controller
PCB
Pattern
LED
ON signal
Image data
CCD
(front of copier)
Transfer belt movement
Mirror
Feeding
direction
CCD array
0th pixel
256th pixel
128th pixel
0line
256th line
130th line
Accumulated value
Accumulated value
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