Exposure; Introduction - Ricoh M5 Service Manual

25, 1985
May,

EXPOSURE

1. Introduction

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Exposure

Light
While the slider moves forward (in the arrow direction), a fluorescent lamp illuminates the surface of
the original on the exposure glass.
An image of the original is reflected through the fiber optics onto the master surface.
Where the light strikes the master surface, the electrical resistance of the master surface decreases
Where no light strikes the master surface, the
and the charge on the master surface is dissipated.
electrical resistance and surface charge remain high. White areas of the original reflect most of the
light; however, dark areas absorb light. In halftone or colored areas the strength of the reflected
light is less, and only part of the charge leaks off.
A reflector is used to maximize the light output from the exposure lamp. On the front side, a side
erase reflector eliminates the shadow created by the edge of the original.
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