Ricoh FT8680 Service Manual page 60

OPTICS 31 July 1995
5.12 UNEVEN LIGHT INTENSITY CORRECTION
[B]
[A]
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[C]
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The slit plate [A] corrects the uneven light intensity at the ends and center of
the fluorescent lamp [B] and evenly distributes light reflected from the original.
To compensate for reduced light at the lens edges, the shading plate [C] is
located in front of the lens. Additionally, the shading plate compensates the
light intensity when the lens horizontal position is shifted.
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