Toshiba e-studio550 Service Manual page 48

(5) Development
Development is a process of making the electro-
static latent images visible to the eye (visible im-
ages).
Developer material is supplied to the photoconduc-
tive drum surface by 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 development method).
Magnet
Magnetic roller
Bias voltage
–500 VDC
Photocon-
ductive
drum
e-STUDIO550/650/810 COPY PROCESS
Toner
Carrier (always attracted
onto the magnet)
Toner
The (–) potential
of the drum being
higher than the
developer bias
The (–) potential
of the drum being
Toner
lower than the
developer bias
Photoconductive layer
Aluminum conductive
base
3 - 4
Drum
White background Half tone
White background Image not developed
– 700V
– 600V
– 500V
– 400V
– 300V
– 200V
– 100V
0
JUNE 2002 © TOSHIBA TEC
Magnetic roller
Solid
Image is developed by
toner
Bias
potential