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C. Pre-Exposure (step 1)
&) Pre-exposure
Figure 2-105
Prior to primary charging, the light of the
pre-exposure lamp is directed to the surface
of the photosensitive drum for pre-exposure,
thereby removing the residual charges from
the surface of the photosensitive drum to
prevent uneven copy density.
COPYRIGHT © 1995 CANON INC.
COPYING PROCESS am
D. Primary Charging (step 2)
.4— Primary corona roller
=
DC bias
Figure 2-106
The surface of the photosensitive drum
is charged to a uniform negative potentia! in
preparation for the formation of static latent
images.
The copier uses its primary charging
roller to directly charge the photosensitive
drum (primary charging).
The primary charging roller is made of
conducting rubber, and a DC bias is applied
to the roller.
Reference:
A direct charging system provides such
advantages as low application voltage
and generates little, if any, ozone.
CANON NP6O12/NPGO2F/NP6212 REV.1 SEPT. 1995 PRINTED N JAPAN (IMPRIME
AU JAPON}
2-3
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