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Chapter 5
5-14
F-5-31
2. Digital Image Processing
- shading correction
F-5-32
5.3.6.2 CCD Drive
0015-4412
iR5065 / iR 5055 / iR5075 / / /
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).
F-5-33
5.3.6.3 CCD Output Gain Correction, Offset Correction
0015-4413
iR5065 / iR 5055 / iR5075 / / /
The machine processes the analog video signals from the CCD so that the rate of their amplitude is a specific level. The machine also makes sure that the output
voltage in the absence of incident light is of a specific level (offset correction).
5.3.6.4 CCD Output A/D Conversion
0015-4414
iR5065 / iR 5055 / iR5075 / / /
The odd-numbered and even-numbered pixel analog video signals after correction are further converted into 10-bit digital signals representing specific pixel voltage
levels by the A/D converter.
5.3.6.5 Outline of Shading Correction
0015-4416
iR5065 / iR 5055 / iR5075 / / /
The machine executes shading correction so that the CCD output will be even when the density of the original is even.
The output of the CCD may not necessarily be even because of the following factors even if the density of the original is perfectly even:
(1) variation in the sensitivity of the individual pixels of the CCD
CCD (1 line each for R, G, and B)
Analog image
signal
Analog image
process
- gain correction
- offset correction
A/D
conversion
CCD drive
control
A12V
A5V
J101
J204
J204
J102
J205
CCD control
signal
Gain correction
data
Digital image
signal
Reader
controller
PCB
Odd-numbered
pixel
Odd-numbered
pixels
Even-numbered
pixels
CCD/AP circuit
10
Even-numbered
pixel
Gain correction
data
EEP-ROM
SRAM
CPU
Shading correction
Digital image
signal
CCD/AP
PCB
Reader controller PCB
10
Digital image
signal
8
Target
value
J101
J102
J204
J205
J203
Shift register
Light-receiving block
(photo diode)
Shift register
Output buffer
Output buffer
Gate
Gate
1
2
3
4
5
6
Odd-numbered pixel data
Even-numbered pixel data
Summary of Contents for imageRUNNER 5055 series
Page 1: ...Feb 26 2007 Service Manual iR5075 5065 5055 Series ...
Page 2: ......
Page 6: ......
Page 27: ...Chapter 1 Introduction ...
Page 28: ......
Page 30: ......
Page 52: ......
Page 53: ...Chapter 2 Installation ...
Page 54: ......
Page 98: ...Chapter 2 2 42 ...
Page 99: ...Chapter 3 Basic Operation ...
Page 100: ......
Page 102: ......
Page 108: ......
Page 109: ...Chapter 4 Main Controller ...
Page 110: ......
Page 112: ......
Page 129: ...Chapter 5 Original Exposure System ...
Page 130: ......
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Page 163: ...Chapter 6 Laser Exposure ...
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Page 173: ...Chapter 7 Image Formation ...
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Page 211: ...Chapter 8 Pickup Feeding System ...
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Page 263: ...Chapter 9 Fixing System ...
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Page 307: ...Chapter 10 External and Controls ...
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Page 321: ...Chapter 10 10 9 F 10 8 ...
Page 345: ...Chapter 11 MEAP ...
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Page 389: ...Chapter 12 RDS ...
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Page 399: ...Chapter 13 Maintenance and Inspection ...
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Page 411: ...Chapter 14 Standards and Adjustments ...
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Page 441: ...Chapter 15 Correcting Faulty Images ...
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Page 471: ...Chapter 16 Self Diagnosis ...
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Page 493: ...Chapter 17 Service Mode ...
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Page 553: ...Chapter 18 Upgrading ...
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Page 572: ...Chapter 18 18 16 F 18 29 2 Click Start F 18 30 3 When the session has ended click OK ...
Page 587: ...Chapter 18 18 31 F 18 59 2 Select the data to download F 18 60 3 Click Start ...
Page 589: ...Chapter 19 Service Tools ...
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Page 595: ...Feb 26 2007 ...
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