Filter
Top Products
c. Actual image forming process
Step 1 (Cleaning, charging): Residual toner on the OPC drum is
stirred and negative charges are dis-
tributed evenly on the OPC drum.
(The OPC drum is evenly charged.)
The main charger brush is of roller shape and is rotating.
The main charger brush stirrs residual toner and paper dust on the
OPC drum.
At the same time, a high voltage of AC 600V (P-P) is applied to DC
–850V and applied to the main charger brush to make electric dis-
charge between the roller and the OPC drum to form positive and
negative charges. The negative charges are attracted to the OPC
drum which is positively charged. And negative charges are evenly
distributed on the OPC drum. (The OPC drum surface is evenly
charged.)
Residual toner and paper dust stirred by the main charger brush are
distributed evenly on the OPC drum.
Step 2 (Exposure); Laser beam scanning light corresponding to the
print data is radiated onto the OPC drum.
Positive and negative charges are generated in the CGL of the OPC
drum which are radiated with laser beams. The positive charges in
the CGL are moved to the OPC drum surface, and the negative
charges are moved to the aluminum layer.
Therefore, positive and negative charges are neutralized in the OPC
drum exposed with laser beams and the aluminum layer, reducing the
OPC drum surface potential. On the other hand, there is no change in
the area which is not exposed with laser beams. So the OPC drum
surface is kept negatively charged to maintain a high potential. As a
result, latent electrostatic images are formed on the OPC drum.
AC600V
(P-P)
CTL
CGL
DC-850V
Main charger brush
Residual toner
Aluminum layer
(Drum base)
OPC drum
CTL
CGL
CTL
CGL
Laser beam
Non-exposure area
Exposure area
Aluminum layer
(Drum base)
Aluminum layer
(Drum base)
1 – 21