Chapter 8
8-3
8.1.3 Electrostatic Latent Image Formation Block
0019-5014
imageRUNNER C1022 / imageRUNNER C1022i / Color imageRUNNER C1030 / Color imageRUNNER C1030iF
In this block, an electrostatic latent image is formed on the photosensitive drum by following three steps.
When a laser beam scans the photosensitive drum charged with a negative potential, an image with negative charge is formed on the photosensitive drum. This
image is called "an electrostatic latent image" because it is invisible to human eyes.
Step 1: Pre-exposure
As a preparation for the primary charging, the LED light of the pre-exposure LED is exposed on the photosensitive drum surface. This eliminates the residual charge
on the drum surface in order to avoid image density unevenness.
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Step 2: Primary charging
As a preparation for the latent image formation, the surface of the photosensitive drum is changed with a uniform negative potential.
The machine charges the photosensitive drum with negative charge directly from the primary charging roller, which is interlocked with the drum.
The primary charging roller is made of a conductive rubber, and a negative DC bias is applied to the roller.
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Step 3: Laser beam exposure
The latent image is formed on the photosensitive drum by a laser beam.
When a laser beam is exposed on the photosensitive drum, the potential on the exposed area (light area) is neutralized and the negative potential is removed from
the drum surface. This area forms electrostatic latent images. A negative potential remains in the area where a laser beam was not exposed (dark area).
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Photosensitive drum
LED
Photosensitive drum
Primary charging roller
DC bias
Laser beam
dark area
light area
Summary of Contents for Color imageRUNNER C1022
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Page 19: ...Chapter 1 Introduction ...
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Page 93: ...Chapter 2 Installation ...
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Page 111: ...Chapter 3 Basic Operation ...
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Page 119: ...Chapter 4 Main Controller ...
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Page 135: ...Chapter 5 Original Exposure System ...
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Page 151: ...Chapter 6 Original Feeding System ...
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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 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 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 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 533: ...Oct 29 2010 ...
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