Figure 4-12 Image-formation process
Electrostatic latent-image formation block
During the two steps that comprise this block, a negative charge is applied to the photosensitive drum
to form a latent image, which is invisible.
Step 1: primary charging
A high-voltage DC bias is applied to the primary charging roller, which is made of conductive rubber and
is in contact with the drum surface. As the roller moves across the drum, it applies the negative charge.
Figure 4-13 Primary charging
Step 2: laser-beam exposure
The laser beam scans the photosensitive drum to neutralize the negative charge on portions of the drum
surface. An electrostatic latent image forms where the negative charge was neutralized.
116 Chapter 4 Theory of operation ENWW
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