Toshiba E-STUDIO520 - 3 Copy Process; General Description

3
March 2005 © TOSHIBA TEC e-STUDIO520/600/720/850 COPY PROCESS
3 - 1
3. COPY PROCESS
3.1 General Description
Fig.3-1
(1) Charging:
Negatively charges the surface of the pho-
toconductive drum.
!
(6) Transfer:
Transfers the visible image on the photo-
conductive drum onto paper.
Separation:
Separates the paper from the drum
together with the toner.
!
(2) Original exposure:
Converts images on the original into optical
signals.
!
(7) Fusing:
Fuses the toner onto the paper by applying
heat and pressure.
!
(3) Scanning:
Converts image optical signals into electri-
cal signals.
!
(8) Brush cleaning:
Cleans dirt and paper dust on the drum.
!
(4) Writing:
Converts image electrical signals into opti-
cal signals (laser emission) and exposes
them to the surface of the photoconductive
drum.
!
(9) Blade cleaning:
Forcibly removes the residual toner on the
drum.
!
(5) Development:
Makes the negatively-charged toner
adhere to the photoconductive drum and
forms a visible image.
!
(10)Discharging:
Discharges any remaining negative charge
on the drum.
Scanning
CCD
600 dpi,7500 pixel
(
3
)
Original exposure
Xenon lamp
29W
(
2
)
Image processing
Bypass feeding
Discharge
LED array
(
Wavelength 660nm x14pcs
)
-500V
(
-300V~-900V
)
(
10
)
Drawer feeding
LCF feeding
FusingDischarging
Fuser roller
700~1450W
(
4
)
Writing
Semiconductive laser
Pw=3.9 nJ/mm
2
(
520/600/720
)
Pw=3.0 nJ/mm
2
(
850
)
(
9
)
(
1
)
Charging
(
grid voltage
)
Bias
-394V
(
-200~-800
)
DC+AC
5 µA
(
5
)
(
6
)
(
7
)
Development
Magnetic roller
Transfer/Separation
70 µA
(
520/600/720
)
85 µA
(
850
)
Cleaning brush + Blade
Blade cleaning
(
8
)
Brush cleaning
Toner
Carrier