45530603TH Rev.2
2-2
Oki Data CONFIDENTIAL
2. DESCRIPTION OF OPERATIO N
(1) Electrophotographic process
The electrophotographic process is explained briefly below:
1. Charging
A voltage is applied to the Charging roller to electrically charge the surface of the
OPC drum.
2. Exposure
The LED head exposures light onto the charged OPC drum in accordance with
the image data. The electric charge of the exposured part of the OPC drum
surface decreases depending on the light, thus forming the electrostatic latent
image on the OPC drum surface.
3. Development
Charged toner are adsorbed to the electrostatic latent image of the OPC drum
by electrostatic power, and forms toner images on the OPC drum surface.
4. Tr a n sfe r
The intermediate transfer belt is arranged in contact with the OPC drum surface.
And the electric charges are charged to the belt by the first transfer roller that is
arranged at inside of the intermediate transfer belt. Therefore, the toner image is
transferred to the intermediate transfer belt. Then, the toner image is transferred
to the paper by the second transfer roller.
5. Drum cleaning
The drum cleaning blade removes toner remaining on the OPC drum after the
transfer.
6. Belt cleaning
The belt cleaning blade removes toner remaining on the belt.
7. Fusing
Heat and pressure are applied to the toner image on the paper for fusing.
2.1 Electrophotographic process mechanism
(2) Charging
The voltage is applied to the charging roller, which is arranged in contact with the
OPC drum surface, to charge the OPC drum surface.
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Power
supply
unit
OPC drum
(3) Exposure
The light emitted from the LED head is exposured onto the charged surface of
the OPC drum. The charge of the exposured part of the OPC drum decreases
depending on the light, forming the electrostatic latent image on the OPC drum
surface.
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Power
supply
unit
OPC drum
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