Toshiba e-STUDIO350 - Page 72

e-STUDIO350/450 COPY PROCESS 3 - 4 November 2003 © TOSHIBA TEC
3
(5) Development
Development is the process of making the
electrostatic latent images visible to the eye
(visible images).
Developer material is supplied to the photo-
conductive drum surface by the magnetic roller.
The toner in the developer material adheres
to the areas on the drum surface where the
potential is lower than the developer bias which
is applied to the magnetic roller (reverse de-
velopment method).
Drum
Magnetic roller
Fig.3-207
Photoconductive layer
Magnet
Magnetic roller
Toner
Carrier (always attracted
onto the magnet)
Toner
Bias voltage
–550 VDC
Photocon-
ductive
drum
Aluminum base
Toner
Fig.3-208
The (–) potential of
the photoconductive
drum is higher than
the developer bias.
The (–) potential of
the photoconductive
drum is lower than
the developer bias.
0
– 100V
– 200V
– 300V
– 400V
– 600V
White background
Halftone
Solid
White background
Image not developed
Bias
potential
Image developed by
toner
750V
550V
Fig.3-209