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e-STUDIO2006/2306/2506/2007/2307/2507/2303A/2303AM/2803AM/2309A/2809A
OUTLINE OF THE MACHINE
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3.8.3
Functions
1. Original glass
This is a glass for placing original. Original (image) placed on the original glass is scanned by the
CIS.
The RADF original glass is used when original is read with the Reversing Automatic Document
Feeder. Original is transported on the RADF original glass by the Reversing Automatic Document
Feeder, and the transported original is read under the RADF original glass by the CIS. Do not use
such solvents as alcohol when cleaning the surface of the RADF original glass, because it is coated
so as not to be scratched by originals.
2. CIS unit (CIS)
The CIS unit (CIS) is a sensor unit which consists of an LED array, lens array and CMOS sensor
array of the same length as that of the original width in the primary scanning direction closely
attached and unified. The original is irradiated at one time with the LED light source which consists
of LEDs of RGB colors (one for each color), light guiding tube to lead each light to the original, and
then the reflected light is scanned by the CMOS sensor.
In the CCD method (reduction optical method), the reflected light of the exposure lamp is LED
through mirrors, lens and slit to the CCD where the optical-to-electrical conversion for scanned data
is performed. In contrast, in the CIS method (close-contact sensor method), those operations are
processed only by the CIS unit. The CIS has characteristics of shallow depth of focus and high light-
sensitivity.
Fig. 3-38
[1] CIS unit [2] RADF original glass [3] Rod-lens array [4] Shading correction plate
[5] Original glass [6] RGB light guiding tube [7] CMOS sensor
- CMOS sensor
Scans the light reflected from an original and converts it to an electrical signal.
In order to realize the same-to-scale optical system of A3 width and 7344 image pixels, the
equipment uses 17 CMOS sensors (each CMOS sensor has 432 image pixels per line) to make
up a CMOS sensor of 600x600 dpi resolution for scanning.
[5]
[2]
[4]
[3]
[1]
[6]
[7]
