Toshiba e-studio281c - Page 97

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COPY PROCESS
3 - 7
5) Development
Development is a process of making the electrostatic latent images visible to the eye (visible image).
Developer material is supplied to the photoconductive drum surface by means of a magnetic roller,
allowing the toner in the developer material to adhere to the areas on the drum surface where the
potential is lower than the developer bias which is applied to the magnetic roller (reverse develop-
ment).
Fig. 3-12
Fig. 3-10
Fig. 3-11
Drum Magnetic roller
Magnet
Photoconductive layer
Magnetic roller
Photocon-
ductive drum
Aluminum base
Toner
Carrier (always attracted
onto the magnet)
Toner
Bias voltage
-400V (-100 to -900V) DC
1.2kV/10kHz AC
Toner
Bias
voltage
When the (–) potential of
the photoconductive
drum is higher than
the developer bias.
When the (–) potential of
the photoconductive
drum is lower than
the developer bias.
- 100V
- 200V
- 300V
- 500V
- 400V
0
White background
Image is not
developed
Image is developed by
toner
White background
Halftone
Solid