Optical System; Ii. Optical System; Outline - Canon CANOSCAN D660U Service Manual

CHAPTER 2

II. OPTICAL SYSTEM

A. Outline
When scanning are flective document, the scanning lamp in the scanning unit exposes the
document and focuses the reflected light from the document on the CCD. When scanning a
film at 601 dpi or higher using FAU, FAU lamp built in the document cover exposes the film,
and optical axis is shifted by a half pixel in the horizontal scanning direction by means of
VAROS unit, and the images before and after the optical axis is shifted are composed by the
host computer.
q VAROS Unit
w CCD
e Belt
r Drive Motor
t Scanning Lamp
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Figure 2-8-1
Figure 2-8-2
COPYRIGHT © 2000 CANON INC.
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CANOSCAN D660U REV.0 JULY 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)