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 5-11 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.
Step 3: development
Toner acquires a negative charge as a result of the friction from the developing cylinder rotating against
the developing blade. When the negatively charged toner comes in contact with the drum, it adheres to
the electrostatic latent image. When the toner is on the drum, the image becomes visible.
Figure 5-12 Development
Developing blade
Developing cylinder
DC negative bias
Photosensitive drum
Unexposed area
Exposed area
Exposed area
Unexposed area
82 Chapter 5 Theory of operation ENWW
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