20 June 2005 SCANNING
6-13
Detailed
Descriptions
6.4 SCANNING
6.4.1 OVERVIEW
1 Exposure lamp 7 Original length sensors 1, 2
2 1st Scanner 8 Original width sensors
3 Exposure glass 9 2nd Scanner
4 Lens block 10 Anti-condensation heater (option)
5 Scanner drive motor 11 Exposure glass (for document feeder)
6 Original length sensor 3 12 Scanner HP sensor
The original is illuminated by the exposure lamp (a xenon lamp). The image is
reflected onto a CCD (charge coupled device) on the lens block via the 1st, 2nd,
and 3rd mirrors, and through the lens on the lens block.
The 1st scanner consists of the exposure lamp, a reflector, and the 1st mirror.
The exposure lamp is energized by a dc supply to avoid uneven light intensity while
the 1st scanner moves in the sub scan direction (down the page). The entire
exposure lamp surface is frosted to ensure even exposure in the main scan
direction (across the page).
The light reflected by the reflector is of almost equal intensity in all directions, to
reduce shadows on pasted originals.
When the optional optics anti-condensation heater is installed on the left side of the
scanner, it turns on whenever the power cord is plugged in.
B195D905.WMF
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