Scanning; Overview - Ricoh A193 Service Manual

SCANNING

1. SCANNING

1.1 OVERVIEW

[A]
[E]
A193D001.wmf
[F] [B]
[D]
[C]
[G]
The original is illuminated by the exposure lamp (a xenon lamp in this model)
[A]. The image is reflected onto a CCD (charge coupled device) [B] via the
1st, 2nd, 3rd mirrors, and 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 a dc supply to avoid uneven light
intensity as the 1st scanner moves in the sub scan direction. The entire
exposure lamp surface is frosted to ensure even exposure in the main scan
direction.
The light reflected by the reflector is of almost equal intensity, to reduce
shadows on pasted originals.
An optics anti-condensation heater [G] is available as an option. It can be
installed on the left side of the inner cover. The heater will turn on whenever
the power cord is plugged in.
SM 2-1 (A193)