SF-73OO
SF-7350
.
.
(5) Image process block
● TheSF-7300/SF-7350usean Organic Photo Conductor(OPC)
drum.
OPC layer
[4.:; , , .; ,
—CTL
. .. .. . . . . ...... . ..
... ,.
. :.: — CGL
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/ , ‘/;’
~
/
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_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 characterareas of the origin~, to forma ktent image
on the drum Sutiati. Toner b attrati to the charge on the ~m
surfaoeand a vie~e image isnowformedonthedrum.
step1.
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
surfaceby transfersoronaunk
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~ potentialb~mes stsbb and
is ready foroperation.
Charge (Main -one unit)
A uniformnegative chage is ap@iedover the dmm sur-
face by the main coronaunit.
tiposure
An e~r=te~ latent image is formedover the drumsur-
face.
Devdopi~
The et~ostatic htent image is convertedinto a vieibk
image by the toner.
Transfer ~renefer -one unit)
The vieibk image on the drum surface istransferredonto
the copypaper.
Ckaning
Toner remaining on the drum is ~llected by the ckmer
bkde.
Opticaldbcharge
Residual cha~e on the drum surface is removedby the
dischargelamp.
B.Copy steps
o : Stepnumber
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 aurfaceby the n~ati tisfer corona unk
A
~~e charge appears inthe-atimini& kyer.
r
Aluminium- ~
layer
CGL
— ;.,.,.. . .,;....,. .. ,.,..:,.,.., ,.:
cn —
OPC drum
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‘.
,
,8”? -?. “,
/.
, ;
,:9?;...;’..‘“
1
●
~Trensfer -ma unt
Step 2: Cleanlng
Surface of the drum is cfeanedby the ~ning Made.
Step 3: Di~harge
L~ht fromthe ~harge hmp k pq.eoted ontothe drumsudace.
Poeitfie and neg~e ~~ee appear in the CGL of the drum. The
negatfvecharge in tie CGL movestowd tie positivechargeinthe
aluminiumlayer. Meenwhik, the positfvecharge moves tward the
nega~e charge on the drumsudace createdat Step 1. The dmm’s
surface charge b reduced to a vary low potential(almost O vds)
because & the n~fi~tin Meet thatoccursbetw~ tie positive
and ~atie draws on ~ the dms sufice end ahminum
core.
5-6
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