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.
Laser beam
Unexposed area Exposed area
Figure 4-11 Laser-beam exposure
Development block
The developing cylinder comes in contact with the photosensitive drum and deposits toner on the
electrostatic latent image.
Step 3: developing
Toner acquires a negative charge from the friction that occurs when the developing cylinder rotates
against the developing blade. When the negatively charged toner comes in contact with the drum, it
adheres to the electrostatic latent image, which becomes visible.
Transfer block
Step 4: image transfer
The positively charged media is transferred over the photosensitive drum. As the media passes between
the transfer roller and the drum, the transfer roller applies a positively DC bias to the media. The
positively charged media attracts the negatively charged toner from the drum surface.
Paper
Transfer charging roller
Photo-
sensitive
drum
Figure 4-12 Image transfer
ENWW Image-formation system 61
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