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6 January 1990
3. EXPOSURE
3.1 OVERVIEW
[D]
[F]
[E]
[A]
[C]
[B]
Light from the exposure lamp [A] reflects off the original and through the fiber
optics [B] to the OPC drum [C]. During exposure, the original moves across
the exposure glass at the same speed as the drum's peripheral velocity.
The platen roller [D] presses the original [E] flat against the exposure glass [F]
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. The heater
o
maintains the lamp's temperature at 40
C
2-5
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