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MFP BASIC TECHNOLOGIES
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2.3.4 Charging
Charging is a process to apply a charge evenly to the surface of the photoconductive drum. The
surface of the photoconductive drum is evenly charged with a negative potential by the main charger.
Fig. 2-14
[Photoconductive drum]
A photoconductive drum consists of the outer and inner layers. The outer layer is a photoconductive
one made of an organic photoconductive carrier, and the inner layer is an aluminum conductive base in
a cylindrical form. The photoconductive carrier has a special property: when it is exposed to light, the
electrical resistance it possesses increases or decreases with the strength of the light.
Fig. 2-15
• Strong incident light: Decreases resistance (works as a conductor)
• Weak incident light: Increases resistance (works as an insulator)
Electrode
Charge
Main charger
Photoconductive drum
Photoconductive
layer
Base
Structure of the photoconductive drum
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