2FP/2FY/2FR
2-1-8
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.
Figure 2-1-8 Amorphus silicon drum
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 mm 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.
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Drum
1. Aluminum base
2. Carrier block (1 to 3 mm thick)
3. Photoconductor a-Si
4. Primary protection layer (1 mm thick)
5. Secondary protection layer
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