B1.2 Electrophotographic Process - Oki OKIOFFICE44 Service Manual

B1.2 Electrophotographic Process

(1) Electrophotographic process
The electrophotographic process is outlined below.
1
Charging
The surface of the image drum is charged negatively and uniformly by applying the DC voltage to
the charge roller.
2
Exposure
Light emitted from the LED head irradiates the negatively charged surface of the image drum. The
surface potential of the irradiated surface attenuates to form the electrostatic latent image correspond-
ing to the image signal.
3 Development and residual toner recovery
The negatively charged toner is brought into contact with the Image drum, adhering to the
electrostatic latent image on the image drum by static electricity. This adhesion causes the
electrostatic latent image to change to a visible image.
At the same time, the residual toner on the image drum is attracted to the developing roller by static
electricity.
4
Transfer
When paper is placed over the image drum surface, the positive charge which is opposite in polarity
to that of the toner, is applied to the reverse side by the transfer roller. The toner is attracted by the
positive charge and is transferred onto the paper. This results in the transfer of the toner image formed
on the image drum onto the paper.
5
Cleaning
The cleaning roller temporarily attracts the residual toner on the transferred image drum with static
electricity, then returns the toner to the image drum.
6
Fusing
The transferred unfused toner image is fused to a sheet of paper by applying heat and pressure to the
image.
Figure B1.3 is a flow for the electrophotographic process.
Print Operation Description B - 4
Service Manual, P/N 59276801
OKIOFFICE 44