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(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.
Document feed
direction
Document reading direction
The phototransistor in the contact sensor
reads one horizontal scanning line at a time.
Fig. 2-15 Flat-bed Scanning (contact sensor system)
GENERAL DESCRIPTION OF A FACSIMILE
Contact sensor
LED array (photoemitter)
Document
Phototransistor array
(photosensor)
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