Chapter 8
8-11
8.2.4 Color Displacement Corrective Control
0019-5022
imageRUNNER C1022 / imageRUNNER C1022i / Color imageRUNNER C1030 / Color imageRUNNER C1030iF
This control corrects color displacement which occurs due to individual difference of the laser scanner unit and toner cartridge.
Since this machine uses a different toner cartridge for each color, a difference may occur in the position or the size of an image depending on the color.
The machine performs correction by calculating the degree of color displacement based on the position of the pattern image for color displacement correction
formed on the ETB and controlling a video signal for each color.
The DC controller executes this control according to the command sent from the main controller.
Corrective control is performed for the following three points.
- Main scanning start position
- Main scanning magnification *
- Sub scanning start position
* This is an image size ratio in the main scanning direction. Since there is individual difference in the toner cartridge for each color, the position of the
photosensitive drum and the laser optical path length vary depending on the color. Since the range of an image in the scanning direction also varies
depending on the color, color displacement occurs at the edge of an image.
The color displacement corrective control is executed at the following timing.
- At power-on after the replacement of the toner cartridge
- When the front cover is closed after the replacement of the toner cartridge
- When a specified number of prints are completed
- When the execution command is received from the main controller
Explanation of operation
1) The DC controller forms a pair of pattern images for color displacement correction (one is on the left side and the other is on the right side) with four colors on
the ETB.
2) The DC controller sends a color displacement/density LED drive signal so that the light emitter (LED) of the color displacement/density sensor emits light.
The color displacement/density sensor is a reflection type sensor located on the upper side of the ETB. It consists of the light emitter (LED) and light receiver
(PD).
3) The light emitted from the emitter is reflected at the ETB and received by the light receiver of the color displacement/density sensor.
The intensity of this reflected light varies depending on whether toner exists or not.
4) The color displacement/density sensor converts the received light into a voltage, and sends it to the DC controller as a color displacement detection signal.
5) The DC controller determines the position of the pattern image based on the timing when the color displacement detection signal changes, and calculates the
degree of color displacement for each color based on the position.
6) The degree of color displacement calculated for each color is sent to the main controller.
7) The main controller controls a video signal for each color based on the degree of color displacement of each color received, and makes adjustments of the main
scanning start position, main scanning magnification, and sub scanning start position.
F-8-16
Color displacement signal
ETB
Color displacement/density sensor (left)
Color displacement/density LED
drive signal
Color displacement/density
sensor (right)
Color displacement/density signal
Pattern image for
color displacement correction
DC controller PCB
Main controller PCB
Light emitter (LED)
Light receiver (PD)
Summary of Contents for Color imageRUNNER C1022
Page 2: ......
Page 6: ......
Page 19: ...Chapter 1 Introduction ...
Page 20: ......
Page 93: ...Chapter 2 Installation ...
Page 94: ......
Page 96: ......
Page 111: ...Chapter 3 Basic Operation ...
Page 112: ......
Page 114: ......
Page 119: ...Chapter 4 Main Controller ...
Page 120: ......
Page 122: ......
Page 135: ...Chapter 5 Original Exposure System ...
Page 136: ......
Page 138: ......
Page 151: ...Chapter 6 Original Feeding System ...
Page 152: ......
Page 154: ......
Page 170: ......
Page 171: ...Chapter 7 Laser Exposure ...
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Page 185: ...Chapter 8 Image Formation ...
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Page 223: ...Chapter 9 Pickup and Feed System ...
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Page 259: ...Chapter 10 Fixing System ...
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Page 262: ......
Page 268: ...Chapter 10 10 6 ...
Page 279: ...Chapter 11 External and Controls ...
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Page 311: ...Chapter 12 e Maintenance imageWARE Remote ...
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Page 323: ...Chapter 12 12 9 F 12 27 ...
Page 349: ...Chapter 13 Maintenance and Inspection ...
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Page 355: ...Chapter 14 Measurement and Adjustments ...
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Page 361: ...Chapter 15 Correcting Faulty Images ...
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Page 385: ...Chapter 16 Error Code ...
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Page 399: ...Chapter 16 16 11 ...
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Page 401: ...Chapter 17 Special Management Mode ...
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Page 411: ...Chapter 17 17 7 ...
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Page 413: ...Chapter 18 Service Mode ...
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Page 493: ...Chapter 19 Upgrading ...
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Page 500: ...Chapter 19 19 4 3 Click Next F 19 4 4 Select a USB connected device and click Next F 19 5 ...
Page 501: ...Chapter 19 19 5 5 Click Start F 19 6 6 Click Yes F 19 7 Download will be started F 19 8 ...
Page 504: ...Chapter 19 19 8 4 Select a USB connected device and click Next F 19 12 5 Click Start F 19 13 ...
Page 506: ...Chapter 19 19 10 ...
Page 507: ...Chapter 20 Service Tools ...
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Page 515: ...Appendix ...
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Page 533: ...Oct 29 2010 ...
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