Oki MB461 - 2.1 Electrophotographic process mechanism

Oki Data CONFIDENTIAL
2. DESCRIPTION OF OPERATION
44871001TH Rev.6
2-2
(1) Electrophotographic process
The following describes the overview of electrophotographic process.
1. Charging
Equally charge the surface of image drum by implying negative voltage to
the charged roller due to negative charge.
2. Exposure
The light from LED Head is exposed on the negative-charged surface of
image drum. The surface electrical potential of the exposed part of image
drum surface becomes lower. Then forms electrostatic latent image.
3. Development
Negative-charged toner is attracted to the electrostatic latent image due to
electrostatic while touching the image drum. Then forms viewable image.
4. Transfer
Overlap paper on the surface of OPC drum, from the backside of paper
transfer toner image to the paper by applying electrical charge by transfer
roller.
5. Fusing
The toner image that is transferred to paper is fused on paper by heat and
pressure.
6. Drum cleaning
The cleaning blade scrapes off the toner that was not transferred and
remains on the image drum.
7. Static elimination
Residual potential on the image drum is removed.
2.1 Electrophotographic process mechanism
1. Charging
Charge the image drum surface by implying voltage to the charged roller that
contacts the image drum surface.
2. Exposure
The light emitting from the LED Head will be exposed to the negative charged
image drum. When the surface electric potential of exposed part of the image drum
goes to decrease, the electrostatic latent image complying with image signal is
formed.
Image drum is coated by basic layer (UL), charge generating layer (CGL), charge
transferring layer (CTL) on the basic material aluminum. The thickness of the
organic light sensor (OPC) that is consisted by CTL and CGL is approximate 20µm.
LED head
LED head
Image drum
Image drum
Paper
Power
Charged
roller
Image drum
Charged roller
Power