Outline - Canon Image Reader-A1 iR5000i Service Manual

1. Outline

The major functions of the image processing system are as follows:
[1] CCD (image sensor)
Number of lines: 1
Number of pixels: 7450
Size of pixel: 4.7 x 4.7 µm
[2] Shading Correction
Shading adjustment: executed in service mode
Shading correction: executed for each copy
[3] Auto Density Adjustment (AE)
Executed for each line in main scanning direction.
The image processing system consists of the following functional blocks:
Analog image processing block
CCD
Analog
image
processing
CCD/AP PCB
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/D
conversion.
[2] Reader controller PCB. Performs shading correction, performs auto density adjustment
(AE).
COPYRIGHT © 2001 CANON INC.
Digital image processing block
A/D
conversion
F03-100-01
2000 2000 2000 2000 CANON iR5000i/iR6000i REV.0 JUNE 2001
CHAPTER 3 IMAGE PROCESSING SYSTEM
Reader controller PCB
Shading processing
Auto density
correction (AE)
Controller unit
3-1 R