Canon fax basic 2000 Manuale Di Servizio

GENERAL DESCRIPTION OF A FACSIMILE

2–20

2.2.3 Electrophotographic method

Canon is putting onto the market facsimiles that use a LASER beam

printer (LBP) engine.

By this method, the pattern to be recorded is exposed on the surface of a

photosensitive drum by a LASER beam, and toner is made to adhere on

that pattern. Next, the toner on the photosensitive drum is transferred to the

recording paper, and is then fixed on the paper by heat and pressure. This

series of operations is called the “print process.”

This recording method has the same advantages as the ink jet recording

method as it uses plain paper as the recording paper. It also has an extra

feature in that it records at high speed. However, as its structure is rela-

tively elaborate and expensive, it is widely used in medium- and high-class

facsimiles.

Fig. 2-18   Electrophotographic System

(4) Transfer

Photosensitive

drum

Transfer charging roller

static
charge
eliminator

(1) Primary charging

Primary charging
roller

Photosensitive drum

(3) Developing

Developing
cylinder

Photosensitive drum

Minus-
charged
toner

Blade

Photosensitive
drum

(2) Exposure

Laser beam

Fixing film

Fixing pressure roller

Fixing
heater

(5) Fixing

Cleaner
blade

(6) Cleaning

Photosensitive drum