Canon fax basic 2000 Manuale Di Servizio
2–17
1
2
3
4
5
6
ït
çi
GENERAL DESCRIPTION OF A FACSIMILE
(2) Contact sensor system
Though contact sensors are inferior to CCD image sensors in terms of
reading speed, contact sensor systems have the advantage that they can be
downsized. This system is used on small-, medium- and large-size
machines accompanying progresses in image-processing technology.
Fig. 2-15 Flat-bed Scanning (contact sensor system)
Contact sensor
The phototransistor in the contact sensor
reads one horizontal scanning line at a time.
reads one horizontal scanning line at a time.
Document
Document reading direction
Document feed
direction
LED array (photoemitter)
Phototransistor array
(photosensor)
(photosensor)