TM 5-6675-324-14
Consists of the following components:
Optical system.
n.
(1) Light source. A single, 300 w halogen lamp provides light for precondi-
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tioning exposure, scan illumination, blank exposure, blank strip exposure, and over
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all exposure. The halogen lamp has two intensity levels: high intensity (bright)
for scanning illumination and low intensity for blank exposure and preconditioning.
Light from the halogen lamp illuminates the original on the moving copyboard. The
image is projected through the lens as a narrow strip across the photosensitive drum
surface. The drum surface revolves at exactly the same speed as the image of the
original is advanced by the copyboard, so the image is spread around the drum in the
correct register. Light from the lamp is rich in red and infrared. This light
would reflect strongly from red colors so they would appear almost like blank areas
and reproduce weakly. The infrared filter blocks much of this light, thus improv-
ing the reproduction of reds.
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