Analog Control Inside The Contact Image Sensor - Canon iR4570 Series Service Manual

Chapter 5
Image read line
Light guide
LED (R/G/B)
Copyboard glass
Rod lens array
scanning direction
CCD array
LED (R/G/B)
Light guide Rod lens array Light guide
LED
CCD LED
F-5-13

5.3.2.2 Analog Control Inside the Contact Image Sensor

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iR2270 / iR2870 / iR3570 / iR4570 / iR3530
The contact image sensor (CIS) is used to control analog image processing in the following flow of work:
The light reflected by the original is collected by the rod lens array;
the light is then collected by the CCD array;
the light is converted into an electric signal by the CCD array (photo-conversion) for output.
The CCD array consists of a total of 8 channels (units). Each channel possesses its own output correction table used
to process an input intensity signal for gain correction for output of an image signal.
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