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41388601TH Rev.2 17 /
2.4.1 Electrophotographic process
(1) Electrophotographic process
The following is the outline of electrophotographic process:
1 Charging
DC voltage is applied to the charging roller and the surface of the OPC drum is negatively
and evenly charged.
2 Exposure
The LED head, under image signals, emits light to the negatively charged surface of the
OPC drum. The radiated portions of the drum surface attenuate in negative charge
according to the intensity of the light and, based on the surface potentials, a latent
electrostatic image is formed on the drum surface.
3 Development
Negatively charged toner contacts the OPC drum and, by electrostatic force, adheres to
the latent electrostatic image to form a clear image on the drum surface.
4 Transfer
Paper is placed on the surface of the OPC drum, and positively, or opposite to the polarity
of the toner, charged by the transfer roller on its back to transfer the toner image to the
paper.
5 Cleaning
The cleaning blade removes residual toner from the OPC drum after the transfer.
6 Fusing
The toner image on the paper is fused into place through the application of heat and
pressure to it.