3

3.2 Details of Copying Process

(1) Photoconductive drum

The photoconductive drum consists of two

layers. The outer layer is a photoconductive

layer made of an organic photoconductive

carrier (OPC), and the inner layer is an

aluminum conductive base in a cylindrical

form.

The photoconductor has the following

property: when it is exposed to light, the

electrical resistance it possesses increases

or decreases according to the strength of the

Photoconductive layer

Base

Structure of the photoconductive drum

(Example of OPC)

Fig. 3-201

Time (t)

light.

Example:

· Strong lighten

Resistance is decreased (works as a

conductor.)

· Weak lighten

Resistance is increased (works as an

insulator.)

[Formation of electrostatic latent image]

In the processes of charging, data reading, data writing, discharging described later, negative potential of the areas on the drum

0

potential (V)

 

 

 

 

Surface

– 500

 

 

– 000

Discharge Charging process process

Black area of original

White area of original

corresponding to black areas of the original are eliminated, while the areas on the drum corresponding to white areas retains the negative charge.

As this image on the drum formed by the negative potential is not visible, it is called an

“electrostatic latent image.”(2) Charging Charging is the process to apply charge evenly on the drum surface.

The charger wire produces negative corona discharge is controlled by the grid, allowing the drum surface to be evenly charged with the negative potential.

The surface potential on the drum is determined by the grid potential and is controlled to a certain value by the grid control circuit.

Electric potential of the photoconductive drum

Fig. 3-202

Main charger

Drum rotation

High-voltage

 

Grid control circuit

transformer

 

 

 

Fig. 3-203

e-STUDIO350/352/353/450/452/453

3 - © 2003 - 2008 TOSHIBA TEC CORPORATION All rights reserved

COPY PROCESS

04/01

 

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Toshiba 452, 453, 350, 353 service manual Details of Copying Process, Example
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350, 353, 453, 452 specifications

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