Scanner Mechanisms; Book Mode - Ricoh IS450S Service Manual

22 December 1998

SCANNER MECHANISMS

2.2 SCANNER MECHANISMS

2.2.1 BOOK MODE

Overview
[E] [A] [C] [B]
[F] [D]
G411D521.WMF
The exposure lamp (a xenon lamp in this model) [A] illuminates the original. The
image is reflected onto a CCD (charge coupled device) [B] via the 1st, 2nd, and 3rd
mirrors, and through the lens [C].
The 1st scanner [D] consists of the exposure lamp, a reflector [E], and the 1st
mirror [F].
The exposure lamp is energized by an ac supply to avoid uneven light intensity
while the 1st scanner moves in the sub scan direction (down the page). The entire
exposure lamp surface is frosted to ensure even exposure in the main scan
direction (across the page).
The light reflected by the reflector is of almost equal intensity in all directions, to
reduce shadows on pasted originals.
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