2 - E - 14
READ SECTION
425-A1 481-A1
CB
420-40
IPB
ADB
411-1
420-1 411-40
CCD
425-A12 481-A12
425-B1 481-B1
425-B12 481-B12
10 mm
L: Document travelling distance while the exposure
unit moves between PS2 sensor and PS5/PS7
sensors in back-scan operation.
S: Scan-start position varies with magnification ratio.
B5R
/
8
1
/
2
"
× 5
1
/
2
"R
width –20
SL
B5R/
8
1
/
2
"
× 5
1
/
2
"R
width –20
10mm
B5R
/
8
1
/
2
"
× 5
1
/
2
"R
width –20
[8] AES Control
(3) ADF mode (1-2, 2-1, 2-2)
The density of the original is read during the AES scan
after the original has been placed in the ADF.
<AES sampling range>
(B5R/8
1
/
2
" × 5
1
/
2
"R width –20) ×
(B5R/8
1
/
2
" × 5
1
/
2
"R width –20)
AES control takes place during an AES scan as a result of the
CCD sensor reading the original density and selecting the most
suitable copy γ correction curve.
AES processing is done by the IPB (image processing board).
1. Operation
a. AES detection operation
(1) During a platen copy operation
When the
Start Print
button is pressed, an AES scan
takes place, and the density is measured over the
range shown below.
<AES sampling range>
With APS detection:
(Document width –20) × (Document length –20)
Without APS detection:
(B5R/8
1
/
2
" × 5
1
/
2
"R width –20) ×
(B5R/8
1
/
2
" × 5
1
/
2
"R width –20)
(2) ADF mode (1-1)
The read operation takes place from the point at which
PS2 (ADF-AES) goes ON during the return scan of the
exposure unit, either while the original is being con-
veyed through the ADF or after the original has been
placed in it.
<AES sampling range>
(B5R/8
1
/
2
" × 5
1
/
2
"R width –20) × L
READ SECTION-1
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