Ricoh A085, Manual

Page: 164 / 617

1. OPTICS
1.1 FIRST SCANNER
The first scanner of this copier has been re-designed from the one for the
base model (A069/A073/A074) to reduce shadows of pasted originals.
Although the exposure lamp’s rating voltage is the same, the shape of the
reflectors have been changed, as shown above. Figure 1 is for the base
model, and figure 2 is for this copier.
For figure 1, the light intensity [A] reflected from the main reflector is stronger
than the light intensity [B] reflected from the sub reflector. The proportion is
about 65% to 35%. Under this condition, as the scanner moves under the
original, the lead edge shadow [C] of the pasted parts of an original might
appear on copies.
For figure 2, the proportion of the light intensity [A,B] reflected from the main
and sub reflectors is almost 50% to 50%. Under this condition, both the lead
and trail edges of the pasted parts of an original will not make shadows.
Shadows might appear not only at the lead edge, but also the inner side of
the pasted parts. The light intensity of the exposure lamp at both ends is
slightly stronger than that at the center. This is necessary to have even
exposure on the drum surface through the lens. Because of this, eliminating
the side edge shadow of pasted parts of an original is very difficult. Although
the light intensity distribution of the exposure lamp from end to end has been
slightly changed on this model, the side edge shadow might appear on thick
pasted originals.
[B]
[C]
[A]
[Fig. 1]
[B]
[A]
[Fig. 2]
10 July 1992 OPTICS
2-1