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(4) Writing
Writing is a process of converting the image signals
Image
processing
section
sent from the image processing section into optical
signals and exposing the drum surface to the light.
Laser Drive
board
Semiconductor laser elements convert image signals sent from the image processing section into
optical signals (laser emission) and exposes the
Polygonal mirror
drum surface to the light to form an electrostatic
Semiconduc-
latent image on it.
tor laser
Photoconductive
element
drum
(5) Development
Development is a process of making the electrostatic latent images visible to the eye (visible images).
Drum
Magnetic roller
Developer material is supplied to the photoconductive 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
Toner
Carrier (always attracted
onto the magnet)
White background
Half tone
Solid
Toner
The (–) potential
of the drum being
higher than the
developer bias
Bias voltage
–500 VDC
The (–) potential
of the drum being
lower than the
developer bias
Toner
– 700V
White background
Image not developed
– 600V
– 500V
– 400V
Image is developed by
toner
– 300V
– 200V
– 100V
OPC
drum
0
OPC layer
Aluminum conductive
base
AR-651/810 COPY PROCESS 3 - 4
Toner amount
applied to the
OPC drum’s
surface
Bias
potential