Canon NP-2120, Руководство по обслуживанию

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of the drum exposed to light from the
conditioning exposure lamp.
remaining
the surface of the drum from the preceding
are eliminated preparation for exposure by
theprimarycorona. Suchcharges, if leftastheyare,
could copies with density.
4. Step 2 Primary corona exposure
Figure 2-6
In this step, the drum exposed by the
corona. As a result, its surface cometo a
uniform layer of negative and maintain
primary potential.
The surface potential of the drum determined
by the value of the grid by way of a
element.
5. Step3 Image exposure
i m a g e
Figure 2-7
In this step, the optical image of the
projectedonthesurfaceofthedrumtoneutralizethe
light
C O P Y I N G P R O C E S S
6. Step 4 Development
Figure 2-8
As shown Figure 2-8, the developing assembly
of a developing cylinder and a
blade; the developing cylinder made up of a
magnet fixed position and acylinder which rotates
around the magnet.
The black developer a single-component
developer of magnetite and The developer
has insulating and charged to a positive
potential by friction with the rotating cylinder.
The color developer a fixed-ratio mixture of
powder) and toner
By friction with the rotating cylinder, the
powder charged to a negative potential, and the
toner to a potential.
Figure 2-9
Aconcentrated magneticfield develops between
the magnet and the tip ofthe blade,
and
the developer
attracted to the
The holds the developer it has
attracted immobile and a collection
of developer hanging from the tip of the
blade. Asthecylinderrotates, thedeveloperparticles
leavethe magneticfieldtodepositthemselvesonthe
cylinder a thin, uniform layer.
both thedeveloping cylinder and blade are
given
bias
and DC bias (negative at
the time, the resulting waveform of the
developing bias has a larger negative
than positive.
C A N O N 1990 IN JAPAN [IMPRIME
2 - 3
1992 CANON INC.