Filter
Top Products
2–3
COPYING PROCESS
COPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
C. Step 1 (pre-exposure)
Figure 2-105
Before primary charging takes place, the light of
the pre-exposure lamp is directed to the photosen-
sitive drum to eliminate the residual charges on the
drum, thereby preventing uneven density.
D. Step 2 (primary charging)
Figure 2-106
The copier uses what is termed
primary charg-
ing
, in which a charging roller made of conducting
material directly charges the photosensitive drum.
Compared to the conventional corona charging
method, direct charging provides such advantages
as a low application voltage and virtual absence of
ozone.
The primary charging roller is a special roller
and possesses different characteristics from the
transfer roller.
Pre-exposure lamp
Primary charging roller