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DRUM PROCESSES
31 December 1992
3. DRUM PROCESSES
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1. Charge
In the dark the charge corona unit applies a negative charge to the drum.
The grid plate ensures the charge is applied uniformly. The charge remains
on the surface of the drum because the photoconductive drum has a high
electrical resistance in the dark.
2. Exposure
High intensity light from a fluorescent lamp is reflected from the moving
original through the fiber optic array. The charge on the drum surface is
dissipated in direct proportion to the intensity of the reflected light, thus
producing an electric latent image on the drum surface.
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