Ccd Drive - Canon iR7086 Series Service Manual

CCD (1 line each for R, G, and B)
Odd-numbered
2. Digital Image Processing
- shading correction
CCD/AP

5.3.6.3 CCD Drive

iR7105 / iR7095
1. CCD
The CCD used in the machine is a 1-line linear image sensor.
- Number of pixels: 7400
- Size of a pixel: 4.7 x 4.7 ym
2. CCD Drive
The signals converted by the light-receiving block are sent out in 2 analog video signal channels (even-numbered pixels, odd-numbered pixels).
Output
unit C
receiving
Output
unit D
5.3.6.4 CCD Drive
iR7086
1. CCD
The CCD used in the machine is a 1-line linear image sensor.
- Number of pixels: 7450
- Size of a pixel: 4.7 x 4.7 ym
2. CCD Drive
The signals converted by the light-receiving block are sent out in 2 analog video signal channels (even-numbered pixels, odd-numbered pixels).
Even-numbered
pixel pixel
Analog image
signal
Even-numbered
Analog image
pixels
process
Odd-numbered
pixels
- gain correction
- offset correction
CCD/AP circuit
J101 J204
Gain correction
data
PCB
J205
J102
Digital image
signal
10
Direction of charge transfer
Clock pulse C
Transfer unit C
Light-
7400 7399 7398 7397 3704
unit
Clock pulse D
Transfer unit D
Direction of charge transfer
J101
A12V
A5V
CCD control
signal
CCD drive
control
Gain correction
data
A/D
Digital image
conversion
signal
J102
F-5-49
Reader controller PCB
Target
CPU
value
Shading correction
F-5-50
Direction of charge transfer
Transfer unit A
3703 3702 3701 3700 3699 3698 3697
Transfer unit B
Direction of charge transfer
F-5-51
J204
J204
Reader
controller
PCB
10
J205
EEP-ROM
SRAM
J203
Digital image
signal
8
Clock pulse A
Output
unit A
CCD
shift
4 3 2 1
pulse
Output
unit B
Clock pulse B
Chapter 5
0011-2249
0011-2256
5-21