e-STUDIO203S/203SD COPY PROCESS 6 - 2
2. Outline of print process
This printer is a non-impact printer that uses a semiconductor laser
and electrostatic print process. This printer uses an OPC (Organic
Photo Conductor) for its photoconductive material.
First, voltage from the main corona unit charges the drum surface
and a latent image is formed on the drum surface using a laser
beam. This latent image forms a visible image on the drum surface
when toner is applied. The toner image is then transferred onto the
print paper by the transfer corona and fused on the print paper in
the fusing section with a combination of heat and pressure.
Step-1: Charge
Step-2: Exposure
* Latent image is formed on the drum.
Step-3: Developing
Latent image formed on the drum is then changed into visi-
ble image with toner.
Step-4: Transfer
The visible image (toner image) on the drum is transferred
onto the print paper.
Step-5: Cleaning
Residual toner on the drum surface is removed and col-
lected by the cleaning blade.
Step-6: Optical discharge
Residual charge on the drum surface is removed, by semi-
conductor laser beam.
3. Actual print process
Step-1: DC charge
A uniform negative charge is applied over the OPC drum surface by
the main charging unit. Stable potential is maintained by means of
the Scorotron charger.
Positive charges are generated in the aluminum layer.
Step-2: Exposure (laser beam, lens)
A Laser beam is generated from the semiconductor laser and con-
trolled by the print pattern signal. The laser writes onto the OPC
drum surface through the polygon mirrors and lens. The resistance
of the OPC layer decreases for an area exposed by the laser beam
(corresponding to the print pattern signal). The beam neutralizes
the negative charge. An electrostatic latent image is formed on the
drum surface.
About
DC5.5KV
( 580V/ 400V)
OPC layer
Pigment
layer
Aluminum
drum
OPC layer
Pigment
layer
Aluminum
layer
Drum surface charge
after the exposure
Non-image area
Image area
Semiconductor laser
Exposure
(semiconductor laser)
