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AR-651/810 COPY PROCESS 3 - 2
3. 2. Details of Copy Process
(1) OPC drum
The OPC drum has two layers, an outer and an inner
layer. The outer layer is a photovoltaic layer made of
an organic photovoltaic carrier (OPC). The inner layer
is an aluminum conductive base in a cylindrical form.
The photovoltaic carrier has the characteristic that
produces an electrical current depending on the
strength of the light exposed.
Example:
· Strong light
촞
A relatively large current is produced
· Weak light
촞
A relatively small current is produced
[Formation of electrostatic latent image]
In the processes of charging, scanning, printing and
discharging described below, negative potential on
the areas of the drum corresponding to black areas
of the original is eliminated, while the areas of the
drum corresponding to white areas remains the
negative charge.
As this image on the drum formed by the negative
potential is invisible, it is called an “electrostatic la-
tent image.”
Structure of the OPC drum
OPC layer
0
– 500
– 1000
Time (t)
Surface potential (V)
Black area of original
White area of original
Electric potential on the OPC drum
Dis-
charging
process
charging
process
Charging
process
process
Aluminum conductive base
OPC
AL core
Surface Charge
Prsipatron
Prsipatron
Resulting Hall
OPC Current Gen.
OPC Current Gen.
Laser
beam
beam
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