Canon iR4570 Series, Service Manual

Page: 181 / 876

Chapter 5
5-13
F-5-13
5.3.2.2 Analog Control Inside the Contact Image Sensor
0006-5928
iR2270 / iR2870 / iR3570 / iR4570
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.
Light guide Light guide
LED
CCD LED
Rod lens array
Light guide
LED (R/G/B)
CCD array
Rod lens array
Image read line
Copyboard glass
LED (R/G/B)
scanning direction