Block 1: Latent image formation
During the two steps that comprise this block, an invisible latent image is formed on the photosensitive
drum.
Step 1: Primary charging
To prepare for latent image formation, the surface of the photosensitive drum is charged with a uniform
negative potential. The product charges the photosensitive drum surface directly from the primary
charging roller. The DC bias and AC bias are applied to the primary charging roller to maintain a
constant charge on the drum surface.
Figure 1-16 Primary charging
DC bias
Photosensitive drum
Primary charging roller
AC bias
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.
Figure 1-17 Laser-beam exposure
Laser beam
Unexposed area Exposed area
ENWW
Image-formation system
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