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3. Transfer stage
Step 4 Transfer (+)
Step 5 Separation
4. Fixing stage
Step 6 Fixing
5. Drum cleaning stage
Step 7 Drum cleaning
Electrostatic latent image
formation stage
Transfer stage
Fixing stage
Drum cleaning stage
Developing stage
Paper path
Direction of drum rotation
2. Scanning exposure
1. Primary charge
7. Drum cleaning
Print delivery
6. Fixing
5. Separa-
tion
4. Transfer
Registration
Multi-purpose tray feed
Cassette feed
3. Develop
ment
Figure 2.7
3.2.1 Electrostatic latent image formation stage
This stage has two steps, which together produce a pattern of electrical charges on the
photosensitive drum.
At the end of the stage, negative charges remain in the unexposed ”dark” area. Charges are
absent from the ”light” areas, where the laser beam struck (exposed) the drum surface.
Since this image of negative charges on the drum is invisible to the eye, it is called an
”electrostatic latent image”.
Time (t)
0
-100
Exposed
area
Unexposed
area
Primary
charge
(step 1)
Scanning
exposure
(step 2)
Primary
charge
(step 1)
Transfer
(step 4)
Surface potential (V)
-500
Figure 2.8