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31 December 1992
EXPOSURE
3.
EXPOSURE
3.1 OVERVIEW
[E]
[G]
[F]
[A]
[D]
[B]
[C]
Light from the exposure lamp [A] reflects off the original and through the fiber
optics [B] to the OPC drum [C]. The reflector plate [D] aides the exposure
lamp intensity for high original moving speed. During exposure, the original
moves across the exposure glass at the same speed as the drum's
peripheral velocity.
The platen roller [E] presses the original [F] flat against the exposure glass
[G] just above the fiber optic array. This ensures that the image is properly
focused. (The original must be within 0.2 mm of the exposure glass surface.)
The exposure lamp is a 100 V, 65 W fluorescent lamp. This lamp has a
heater which prevents a reduction in light output due to low temperatures.
o
The heater maintains the lamp's temperature at 40
C
2-5
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