Toshiba e-studio281c - General Description of Copying Process

e-STUDIO281c/351c/451c © 2005 - 2008 TOSHIBA TEC CORPORATION All rights reserved
COPY PROCESS
3 - 2
3.2 General Description of Copying Process
Fig. 3-3
(1) Charging: Places a negative charge on the
surface of the photoconductive drum.
(6) 1st transfer: Transfers the visible image
(toner) on photoconductive drum to the
transfer belt.

(2) Original exposure: Converts images on the
original into optical signals.
(7) 2nd transfer: Transfers the visible image
(toner) on the transfer belt to paper.

(3) Data reading: The optical image signals are
read into CCD and converted into electrical
signals.
(8) Fusing: Fuses the toner image to the paper
by applying heat and pressure.

(4) Data writing: The electrical image signals
are changed to light signals (by laser emis-
sion) which expose the surface of the photo-
conductive drum.
(9) Blade cleaning: While scraping off the resid-
ual toner from the drum by the blade, this
blade also eliminates the (+) residual charge
on the drum left after image transfer.

(5) Development: Negatively-charged toner is
made to adhere to the photoconductive
drum, producing a visible image.
(10) Discharging: Eliminates the residual (–)
charge from the surface of the photocon-
ductive drum.

Carrier
Toner
Photocon-
ductive drum
Fusing
Paper exit
Original exposure
Xenon lamp
16 W
Data reading (scanning)
CCD
600dpi, 7450 pixels
Image processing
Wavelength 660nm x 14pcs.
Discharging
(
LED array
)
1800V
(
400 to 4000V
)
1st transfer
-1000 V
Cleaning
Charger (grid voltage)
-600V
(
-300 to -1200V
)
Bypass feeding
Drawer feeding
PFP/LCF feeding
2nd transfer
(
+
)
1000V
(
500 to 4800V
)
(-)-
1000V
(
-100 to –2000V
)
Magnetic roller bias
Black development
-
400V
(-
100 to -900V
)
DC
1.2 kV/10kHz AC
Magnetic roller bias
Color development
-
400V
(-
100 to -900V
)
DC
1.0 kV/10kHz AC
IH coil
700 to 1300 W
Data writing
Semiconductor laser
Pw=4.0 nJ/mm
2
8
10
962
3
7
4
1
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