42615101TH Rev.8 25 /
Oki Data CONFIDENTIAL
2. Operation Description
2.1 Electrophotographic Process Mechanism
(1) Electrophotographic Process
Following describes the outline of an electrophotographic process incorporated into printers.
1. Charging
Applying a voltage to a charging (CH) roller charges the surface of an optical
photoconductive (OPC) drum.
2. Exposure
The surface of the drum having a charge is exposed to light an LED head emits under
each image signal. Segments of the surface have a reduced charge according to the
intensities of the light they receive, a static latent image being created on the surface
based on electrical potentials on the surface
3. Development
Charged toner is attracted to the latent image of the drum by static electricity and
makes the image visible on the surface of the drum.
4. Transfer
Paper is brought into contact with the drum, and applied with a charge by a transfer
roller from the back, the toner image being transferred to the paper.
5. OPC Drum Cleaning
A drum cleaning blade removes residual toner from the drum after the transfer.
6. Transfer Belt Cleaning
A belt cleaning blade removes residual toner from a transfer belt.
7. Fusing
Heat and pressure fuses the toner image to the paper.
(2) Charging
Voltage is applied to a CH roller contacting the surface of an OPC drum, depositing a charge
over the surface.
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CH Roller
Power
Supply
Unit
OPC Drum
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