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e-STUDIO350/352/353/450/452/453
COPY PROCESS
© 2003 - 2008 TOSHIBA TEC CORPORATION All rights reserved
(5) Development
Development is the process of making the elec-
trostatic latent images visible to the eye (visible
images).
Developer material is supplied to the photocon-
ductive drum surface by the magnetic roller.
The toner in the developer material adheres to
the areas on the drum surface where the poten-
tial is lower than the developer bias which is
applied to the magnetic roller (reverse develop-
ment method).
Drum
Magnetic roller
Fig. 3-207
Photoconductive layer
Magnet
Magnetic roller
Toner
Carrier (always attracted
onto the magnet)
Toner
Bias voltage
–550 VDC
Photoconduc-
tive drum
Aluminum base
Toner
Fig. 3-208
The (–) potential of the
photoconductive drum
is higher than the devel-
oper bias.
The (–) potential of the
photoconductive drum
is lower than the devel-
oper bias.
0
– 100V
– 200V
– 300V
– 400V
– 600V
White background
Halftone
Solid
White background
Image not developed
Bias poten
-
tial
Image developed by toner
750V
550V
Fig. 3-209