Canon fax basic 2000 Manuale Di Servizio

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GENERAL DESCRIPTION OF A FACSIMILE

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 

 and 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.

Fig. 2-13   Cylinder Scanning

Horizontal
scanning

Document

contact surface

Document

Vertical scanning

Illuminating
light source

Lens

Photosensor

Horizontal
scanning

Cylinder

V

e

rtical

scanning