6. PRINTING OPERATION PRINCIPLE
6.1. PROCESS CHART AND PROCESS BIAS
6.2. CHARGING
Charging is the stage that keeps the surface of the sensitive drum a fixed electric potential. The
sensitive drum is the Organic Photo Conductor (OPC), which is a electric conductive cylinder
whose surface is covered with the Charge Generation Layer (CGL) and Charge Transfer Layer
(CTL).
When the charging bias (DC -1.2 kV) is added and the minus charge is supplied to the charge
brush while charging, the whole surface potential of the drum is -800V.
Charging Part
6.3. EXPOSING
When the drum which is charged with the fixed electric charge is irradiated by the laser beam,
the plus charge and minus charge are generated at the Charge Generation Layer. Passing
through the Charge Transfer Layer which conducts the plus charge, the minus-charged drum's
surface is neutralized to be skipped. Then the minus charge goes to the ground from the
electric conductive cylinder. Consequently the charge of the part which is not exposed remains
as it is, and the electric potential of the scanned part changes.
At that time an invisible image is created on the drum.
Exposing Part
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