Canon ImageRunner iR8500 Series, Service Manual, Page: 311 / 1122

Chapter 6
6-1
6.1 Outline
6.1.1 Outline of the Image Processing System
0006-9656
iR105i/iR105+ / iR9070
The image processing system has the following major functions:
- CCD (image sensor)
number of lines: 1; number of pixels: 7500; pixel size: 7 x 7 um
- Shading Correction
shading adjustment: executed in service mode
shading correction: executed for each copy
- Auto Density Adjustment (AE)
executed for each single line in main scanning direction
The following is the functional construction of the image processing system:
F-6-1
Each PCB of the image processing system has the following functions:
[1] CCD/AP PCB
CCD drive, analog image processing, A/D conversion
[2] Reader Controller PCB
shading correction, auto density adjustment (AE), image data conversion (4 channels -> 2 channels)
6.1.2 Outline
0008-9640
/ iR8070
The major functions of the image processing system are as follows:
- CCD (image sensor)
Number of lines: 1
Number of pixels: 7450
Size of pixel: 4.7 x 4.7 um
- Shading Correction
Shading adjustment: executed in service mode
Shading correction: executed for each copy
- Auto Density Adjustment (AE)
Executed for each line in main scanning direction.
The image processing system consists of the following functional blocks:
F-6-2
Each of the PCBs used in the image processing system has the following functions:
[1] CCD/AP PCB: Drives the CCD, performs analog image processing, performs A/Dconversion.
[2] Reader controller PCB: Performs shading correction, performs auto density adjustment (AE).
CCD/AP PCB
Reader controller PCB
CCD
A/D
conversion
Shading processing
Auto density correction (AE)
Pixel data
(4 channels ® 2 channels)
Analog
image
processing
Analog image processing block
Main
controller
Digital image processing block
CCD/AP PCB
Reader controller PCB
CCD
A/D
conversion
Shading processing
Analog
image
processing
Analog image processing block
Controller unit
Digital image processing block
Auto density
correction (AE)