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CHAPTER 2
II. OPTICAL SYSTEM
A. Outline
The optical system consists of the scanning lamp, lens and mirrors. When scanning a
reflective materials such as papers , the original is exposed to the light of the scanning lamp
in the scanning unit. The reflected light of the original forms an image on the photosensitive
device, CCD (charge-coupled device) via lens and mirrors.
When scanning transparent material such as films, Light of the FAU lamp in the Film
Adapter Unit transmits the film. The transmitted light forms an image on CCD.
When scanning with FARE function, IR LED instead of FAU lamp works to operate FARE
unit.
Scanning Lamp
2 - 6
Lens
Figure 2-5
COPYRIGHT 2003 CANON INC. CANOSCAN 9900F REV.0 FEB. 2003 PRINTED IN JAPAN (IMPRIME AU JAPON)
CCD
FARE Unit
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