Electrostatic latent image formation block
The image formation process begins with the electrostatic image formation block, in which
an electrostatic latent image is formed on the photosensitive drum. This block consists of
three steps:
● primary exposure
● primary charging
● laser beam exposure
After the last step is completed, areas of the drum surface that have not been exposed to
the laser beam retain a negative charge. The areas exposed to the laser are neutralized.
This neutralized image is called an electrostatic latent image because it is invisible to the eye.
Step 1: Primary exposure
To prepare for primary charging, light from the primary exposure LED strikes the
photosensitive drum surface. This eliminates any residual charge on the drum surface in
order to avoid inconsistent charge density.
Figure 5-19. Primary exposure illustrates this step.
Figure 5-19.
Primary exposure
ENWW Image formation system 155
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