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[7] AE Control
ICB IFB
The CCD sensor detects the image density on an orig-
inal during AE scanning to select the optimum copy
gamma correction curve.
AE processing is controlled by the ICB (image control
board).
1. Operation
a.
AE detection
(1) Platen mode
The image density on an original is measured
while the exposure unit moves from the home
position to the leading edge of the original after
depression of the START button.
<AE sampling area>
(1) Normal copy
10mm inside perimeter of original size detected
by APS.
CCD
ADB
ICB
2-C-7
(2) Non-image area erasure mode
Entire original area detected by forward scan-
ning.
(3) DF mode
The image at the leading edge of the original is
read when the START button is pressed.
The read data is used to measure the image den-
sity on the original.
<AE sampling area>
(1) Main scanning direction
• 10-mm area inside the original detected by
APS
(2) Sub scanning direction
Range between 2mm to 7.3mm from the leading
edge of the original.
READ SECTION
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