Toshiba e-STUDIO200L/230/280 SERIES - 3 Copy Process; General Description of Copying Process

3
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COPY PROCESS
3 - 1
3. COPY PROCESS
3.1 General Description of Copying Process
Fig. 3-1
(1) Charging: Applies negative charge on the
surface of the photoconductive drum.
(7) Transfer: Transfers the visible toner image
on the photoconductive drum onto paper.

(2) Original exposure: Converts images on the
original into optical signals.
(8) Separation: Separates paper with the toner
image from the photoconductive drum.

(3) Data reading: The optical signals are con-
verted into electrical signals.
(9) Fusing: Fuses the toner image onto the
paper by applying heat and pressure.

(4) Data writing: The electrical signals are con-
verted into light signal (laser emission)
which exposes the surface of the photo-
conductive drum.
(10) Cleaning: Scrapes off the residual toner
from the drum.

(5) Development: Negatively-charged toner
adheres to the photoconductive drum and
forms visible image.
(11) Discharging: Eliminates the residual nega-
tive charge from the surface of the photo-
conductive drum.

(6) Transfer bias: Improves transfer efficiency.

Original exposure
Xenon lamp
16W
Data reading(scanning)
CCD
600 dpi,7400 pixel
Image processing
Discharging
Discharge LED (red)
Wavelength 660nm x14pcs
(
11
)
(
9
)
(
8
)
(
7
)
(
6
)
(
10
)
(
2
)
(
3
)
(
1
)
(
4
)
(
5
)
Data writing
Semiconductive laser
Pw=4.0 nJ/mm
2
Charging
-495V
(grid voltage)
Development
Magnetic roller
Bias -357VDC+AC
+150VDC
Toner
Carrier
Cleaning
Blade method
Bypass feeding
(
100 sheets
)
PFP
(
upper/lower
)
(
550 sheets
)
or
LCF
(
1250 sheets x 2
)
Drawer feeding
(
upper/lower
)
(
550 sheets
)
Transfer
H 418 µADC
C 445 µADC
L 310 µADC
Separation
H -109 µADC
Paper exit
Fusing
Lamp heating method
564W x2
Transfer bias
DC +600V
L -77 µADC
C -109 µADC