E. Image Exposure (step 3)
F. Development (step 4)
Optical image
Figure 2-107
In this step, the optical image of the orig-
inal is projected to the photosensitive drum
to neutralize the charges in the light area.
, Blade
1
kf
Figure 2-108
As shown in Figure 2-108,
the develop-
ing assembly consists of a rubber blade and
a developing cylinder constructed of a fixed
magnet and a cylinder that rotates around it.
The coprer’s toner is a one-component toner
made mostly of magnetite and resins. The
toner has insulating characteristics and
becomes positively charged by the friction
between the rotating cylinder and the blade.
The toner is moved between the rotating
developing cylinder and a blade, where it is
charged to a positive potential and deposited
on the developing cylinder in a thin, uniform
layer.
The developing cylinder receives both
AC bias and DC bias (negative component)
at the same time; the resulting bias is called
developing bias. For this reason, the nega-
tive component of the developing bias is
greater than the positive component.
Figure 2-l 09
2-4
COPYRIGHT 0 1995 CANONINC.
CANON NP6012/NPC012F/NP6212 REV.1 SEPT.1995 PRlNTEDINJAPAN(IMPRIM~AUJAPON)
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