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• Dark areas on the photosensitive drum ("white" image areas)
(3) Here, toner cling to dark areas though in small amounts. There also
exists a difference between the electrical potential of dark areas and
the electrical potential of the developing cylinder. This difference is in
a mutual relationship where the electrical potential of dark areas is
greater than the electrical potential of the developing cylinder. Accord-
ingly the dark areas on the photosensitive drum try to attract toner. The
toner frees itself from the magnet to jump to dark areas though in
small amounts.
(4) Here, excess toner cling to dark areas on the surface of the photosensi-
tive drum is removed to prevent "fogging." There also exists a differ-
ence between the potential of dark areas and the potential of the
developing cylinder. This difference is in a mutual relationship where
the potential of dark areas is smaller than the potential of the develop-
ing cylinder. As the mutual difference between electrical potentials is
large, toner returns to the developing cylinder as the developing cylin-
der tries to attract the toner.
Photosensitive
drum
+ V
0
(3)
- V
Fig. 4-51 Function of Toner (dark areas)
Voltage of dark area
Toner
(3)
Developing
(4)
cylinder
AC bias
DC bias
(4)
(4)
t
DC bias electrical potential
Dark area electrical
potential
(3)
(3)
Developing cylinder
electrical potential
RECORDING SECTION
4–41
1
2
3
4
5
6
ït
çi
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