15 February 2006 ADF
6-23
Detailed
Descriptions
6.4.9 ADF SCANNING
The ADF scans both sides of an original without inverting the original:
• Front side: Scanned at the ADF exposure glass [A] by a xenon exposure
lamp and CCD below the original
• Back side: Scanned by a CIS [B] above the paper path
The CIS can scan a line 306 mm (12") wide at 600 dpi. To increase the scanning
speed, the sensors are divided into 13 parallel blocks.
NOTE: Both sides are scanned at 600 dpi. The 600 dpi output is boosted to 1200
dpi by image processing at the IPU.
The CIS reads the surface of the white roller [C] and uses this reading (white point
=0) as a reference point for density correction.
! Digital Processes> Image Processing> Black and White CCD Systems, Black
and White CIS Systems
B246D864.WMF
B246D868.WMFF
[A]
[B]
[C]
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