Amorphus-Silicon Drum - Kyocera FS-1900 Service Manual

Amorphus-silicon drum

The printer use the long lasting amorphous silicon drum. The drum surface is a composite of five
substances coated in five layers as shown below.
The primary and secondary layers are for protecting the amorphous silicon layer underneath. The
amorphus silicon layer is of photoconductive, meaning it can be electronically conductive when
exposed to a (laser) light source to effectively ground electrons charged on its outer surface to the
ground. This layer is approximately 9 µm thick.
The carrier block layer lies between the amorphous silicon layer and the aluminum base cylinder
and prevents the backward electron flow, from the base cylinder to the drum's outer surface, which
might give adverse effect (possibly "ghost") on the print quality.
4
3
2
1
1 Aluminum base
2 Carrier block (1 to 3 µm thick)
3 Photoconductor a-Si
4 Primary protection layer (1 µm thick)
5 Secondary protection layer
Figure 4-1-3 Amorphus silicon drum
5
4-5
Drum
FS-1900