F. Development (step 4)
Figure 2-108
As shown in Figure 2-108, the developing
assembly consists of a developing cylinder com-
posed of a fixed magnet and a cylinder that
rotates it and a magnetic blade.
The single-component developer used for the
NP6085 consists of magnetite and resins. The
toner (developer) has insulating characteristics
and becomes negatively charged by friction
against the rotating cylinder.
Figure 2-109
A concentrated magnetic field occurs from the
magnet to the tip of the blade, attracting the mag-
netic toner.
Once inside the concentrated magnetic field,
the toner becomes virtually immobile because of
its strong bond to the blade, ensuring a thin, uni-
form layer of toner on the cylinder.
An AC bias and a DC bias are simultaneously
applied to the developing cylinder and the blade
(developing bias); as such, the positive compo-
nent of the developing bias is greater than the
negative component.
Figure 2-110
During copying operation, toner is attracted to
the photosensitive drum or to the developing
cylinder according to the strength of the magnetic
field caused by the difference between the drum
surface potential and the developing cylinder sur-
face potential (i.e., developing bias), thereby turn-
ing the static image into a visible image.
2. COPYING PROCESSES
COPYRIGHT © 1996 CANON INC.
CANON NP6085 REV.0 JULY 1996 PRINTED IN JAPAN (IMPRIME AU JAPON)
2-5
Cylinder
Magnet
Developing cylinder
Toner
Blade
Magnet
Blade
Concentrated
magnetic field
Magnet
Toner
1500V
DC bias
Positive component
0V
Negative component
Содержание NP6085
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Страница 498: ...COPYRIGHT 1996 CANON INC CANON NP6085 REV 0 JULY 1996 PRINTED IN JAPAN IMPRIME AU JAPON A 5 ...
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