Latent-image formation stage
During the steps that comprise this stage, a latent image is formed by applying a negative charge to the
photosensitive drum. You cannot see this image on the drum.
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
to that surface.
Figure 5-12 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 is formed where the negative charge was neutralized.
Figure 5-13 Laser-beam exposure
Laser beam
Unexposed area Exposed area
Developing stage
The developing cylinder comes in contact with the photosensitive drum and deposits toner on the
electrostatic latent image.
96 Chapter 5 Theory of operation ENWW
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