1600/2000/2500 COPYING PROCESS
3 - 4
December 2000 © TOSHIBA TEC
(5) Development
• “Developing” is the process of converting the
electrostatic latent image to an image visible
to the human eye.
The developing agent is fed to the surface of the photosensitive drum by the magnetic rollers, and
impressed on the rollers. Toner in the developer agent attaches to areas on the photosensitive drum
having a potential lower than the developer bias (reverse developing method).
• Switching of developing bias polarity
Fogging is reduced by switching the bias of negative voltage charged areas to positive
polarity
(approx. +150V).
• About Developing Agent
Toner and carrier are mixed. The toner is
charged to minus polarity, and the carrier is
charged to plus polarity by friction caused by
stirring.
Toner:
Comprises plastic and Magnetite.
Carrier: Ferrite
0
100V
200V
300V
460V
or
430V
600V
Intermediate tones
Black solid
White background
White background
Image is not developed
by bias potential.
Bias
voltage
When the
potential
of the photosensitive
drum is higher than the
developer bias:
When the
potential
of the photosensitive
drum is lower than the
developer bias:
03009-a
Magnetite
(40 ~ 65%)
Resin
(35 ~ 60 %)
[Toner]
[Carrier]
Ferrite
5 ~ 20 µm
Approx. 60 µm
Image is developed by
toner.
Drum
Sleeve roller
03008
03009
Magnet
Toner
Carrier
(Always attracted
on to the magnet)
Bias voltage
-460V or -430V
Sleeve
Fig. 3-2-7
Fig. 3-2-9
Fig. 3-2-8
Fig. 3-2-10
Summary of Contents for DP1600
Page 1: ...DIGITALPLAINPAPERCOPIER DP1600 2000 2500 File No 31100011 R0111216600 TTEC ...
Page 2: ...Copyright 2000 TOSHIBA TEC CORPORATION ...
Page 232: ...1600 2000 2500 PCB BOARD 16 2 December 2000 TOSHIBA TEC 16 2 PWA F RLY 16 02 01 ...
Page 233: ...December 2000 TOSHIBA TEC 16 3 1600 2000 2500 PC BOARD 16 3 PWA F PIF 16 03 01 ...
Page 237: ...17 WIRE HARNESS CONNECTION DIAGRAMS 17 1 ...
Page 264: ...1 1 KANDA NISHIKI CHO CHIYODA KU TOKYO 101 8842 JAPAN ...