Electrostatic Latent Image Formation Stage - Brother HL-1260 Service Manual

3. Transfer stage
Step 4 Transfer (+)
Step 5 Separation
4. Fixing stage
Step 6 Fixing
5. Drum cleaning stage
Step 7 Drum cleaning
Drum cleaning stage
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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".
Electrostatic latent image
formation stage
2. Scanning exposure
1. Primary charge
7. Drum cleaning
Fixing stage
5. Separa-
tion
6. Fixing
Transfer stage
Figure 2.7
0
-100
-500
Primary
charge
(step 1)
3. Develop
ment
4. Transfer Registration
Cassette feed
Time (t)
Exposed
area
Unexposed
area
Scanning
Transfer Primary
exposure
(step 4) charge
(step 2)
(step 1)
Figure 2.8
II - 6
Paper path
Direction of drum rotation
Developing stage
Multi-purpose tray feed