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SF-73OO
SF-7350
.
.
(5)
Image process block
TheSF-7300/SF-7350 use
an Organic Photo Conductor(OPC)
drum.
OPC layer
[4.:;
,
,
.;
,
—CTL
. .. .. . . . . . ..... . .. . .. ,. . :.:
—
CGL
gh{sy/////;~
/,/'
/
, '/;'
~
/ ,/ ,,
/.
_Aluminium
layer
CTL (Charge TranspoRLayer) of 21 mkrons
CGL (Charge Generator Layer) of 0.2 to 0.3 microns
A. The
basic copy
prmess
Operationaltheory
A charge b appfied over the OPC drum surfa~ from the main
corma un~ The im~e exposed by the -y
hmp & prqected over
the drum. The cha~
on the drum sutiaa & a~ipeted in afl area
except, {orthe character areas of the origin~, to form a ktent image
on the drum Sutiati. Toner b attrati
to the charge on the ~m
surfaoeand a vie~e image is now formed on the drum.
step
1.
step 2.
step3.
step 4.
step 5.
step 6.
step 7.
Step 8.
step 9.
Charge ~rensfer corona unit)
A uniformnegaWe charge is ~iied
over the OPC drum
surface by transfersorona unk
Cbaning
The reeidud toner kft on the drum surface after transfer
is removedby the ckaner unit.
Opticaldis&arge
Restiual charge on the dmm sutia~ is remov~ by the
discha~
hmp.
After Step 1 (charge), Step 2 (deening) and Step 3 (dis-
charge), tie drum suda~ potential b~mes
stsbb and
is ready for operation.
Charge (Main -one
unit)
A uniformnegative chage is ap@ied over the dmm sur-
face by the main corona unit.
tiposure
An e~r=te~
latent image is formedover the drum sur-
face.
Devdopi~
The et~ostatic
htent image is converted into a vieibk
image by the toner.
Transfer ~renefer -one
unit)
The vieibk image on the drum surface is transferredonto
the copypaper.
Ckaning
Toner remaining on the drum is ~llected by the ckmer
bkde.
Opticaldbcharge
Residual cha~e on the drum surface is removed by the
dischargelamp.
B.
Copy steps
o : Step number
No.6 mirror
r
I* lamp
0!0
Step 1: Charge (Tranafer corona unit)
Prforto go~
into h
copy cycte, a uniformnegative &arge is ap
plied over the drum aurface by the n~ati
tisfer
corona unk
A
~~e
charge appears in the-atimini& kyer.
r
Aluminium-
~
layer
CGL
—
; .,.,..
. .,;....,. .. ,.,..:,.,.., ,.:
cn
—
OPC drum
,"
---.
'.
,
,8"?
-?.
",
/.
, ;
,:9?;...;
'..
'"
1
~Trensfer -ma
unt
Step 2: Cleanlng
Surface of the drum is cfeanedby the ~ning
Made.
Step 3: Di~harge
L~ht from the ~harge
hmp k pq.eoted ontothe drum sudace.
Poeitfie and neg~e
~~ee
appear in the CGL of the drum. The
negatfve charge in tie CGL movestowd tie positivecharge in the
aluminium layer. Meenwhik, the positfvecharge moves tward the
nega~e charge on the drum sudace created at Step 1. The dmm's
surface charge b reduced to a vary low potential (almost O vds)
because & the n~fi~tin
Meet that occursbetw~
tie positive
and ~atie
draws
on ~
the dms
sufice end ahminum
core.
5-6
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