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Developing Stage
The developing station develops the latent electrostatic image
into a visible image on the drum. The developing unit consists of
a metallic cylinder that rotates around a fixed magnetic core
inside the toner cavity. Toner is a powdery substance made of
black plastic resin bound to iron particles, which is attracted to
the magnetic core of the cylinder. A rubber blade “brushes” the
toner on the developing cylinder to a uniform thickness.
The toner particles obtain a negative surface charge by rubbing
against the developing cylinder which is connected to a negative
DC supply. The negatively charged toner is attracted to the
discharged (grounded) areas of the drum exposed to laser light,
and repelled from the negatively charged (non-exposed) areas.
An AC potential is applied to the developing cylinder to decrease
the attraction between the toner and the magnetic core of the
cylinder, and to increase the repelling action of toner against the
areas of the drum not exposed to laser light. This AC potential
improves density and contrast.
Figure 5-12 Image Development
5-22 Functional Overview