Service manual

CHAPTER 2
2 - 7
COPYRIGHT © 2001 CANON INC. CANOSCAN D1230U/D2400U REV.0 MAR. 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
II. OPTICAL SYSTEM
A. Outline
The optical system consists of the scanning lamp, lens and mirrors. When scanning a
reflective document, the scanning lamp in the scanning unit exposes the document and
focuses the reflected light from the document on the light-sensitive device CCD (charge-coupled
device) via the lens and mirrors.
When scanning a film, FAU lamp in the Film Adapter Unit transmits the film and focuses the
transmitted light on the CCD.
When using FARE system, infrared LED transmits a film after FAU lamp does, and FARE unit
operates to scan the film.
Figure 2-6
LTR
A4
LTR
B5
A4
B5
CCD
Lens
FARE Unit
Scanning Lamp