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2.1
Reading Section
The role of the reading section is to read the document(s) to be transmitted
to the other party and convert images into electrical signals.
For those used to operating a personal computer, calling the reading sec-
tion an "image scanner" will be easier to understand.
Reading methods can be broadly classified into the following two meth-
ods.
2.1.1 Cylinder scanning
This scanning method uses a single photosensor and a rotating cylinder
that enables two-dimensional movement around the sensor.
The document is wound around the cylinder, and the photosensor is moved
in the direction of the cylinder shaft while the cylinder is rotated.
The direction that the document rotates is the
direction that the photosensor moves is the
This scanning method was used when facsimiles first appeared on the mar-
ket, and is now no longer used.
Cylinder
Horizontal
scanning
Photosensor
Lens
Fig. 2-13 Cylinder Scanning
GENERAL DESCRIPTION OF A FACSIMILE
horizontal scanning
vertical
scanning.
Document
contact surface
Document
Vertical scanning
Illuminating
light source
1
2
3
4
and the
5
6
Horizontal
scanning
ït
çi
2–15
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