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Image Formation System 5-25
Photosensitive Drum
The special properties of the Photosensitive Drum allow an image to
be formed on the Drum surface and then transferred to paper. The
Drum is an aluminum cylinder. The outside of the cylinder is coated
with a layer of organic-photoconductive material (OPC) which is
non-toxic. The OPC material has properties similar to a
photo-resistor. It becomes electrically conductive when exposed to
light. (The negative charges deposited on the Drum are conducted to
the ground potential of the Drum base.) Areas not exposed to light
remain non-conductive and maintain their negative charge. The
aluminum base of the photosensitive Drum is electrically connected
to ground potential.
Figure 5-11 Photosensitive Drum