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CHAPTER 2
Step 2: Laser beam exposure
When the laser beam scans the drum surface, it causes the charges in the area struck by the
laser beam to be neutralized. These areas on the drum surface form the electrostatic latent
image.
2. Developing block
Toner particles are placed onto the electrostatic latent image on the drum surface to form a vis-
ible image. This printer uses the toner projection development method with a single-component
toner.
Step 3: Developing
Note:
Charges in the exposed areas of the photosensitive drum are shown as positive in the
figure, even though they are actually negative. It means that the photosensitive drum
potential is higher as compared with that of the cylinder.
2 - 28
Laser beam
Unexposed area
Figure 2-4-7
Blade
Photo-
sensitive
drum
AC bias
DC bias
Figure 2-4-8
Exposed area
Stirrer
Developing cylinder
Cylinder
Magnet
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