Table of Contents
Advertisement
"1
Light -
K\
~b+fi
,
Ov
.
. .
@
.
.'
.-
@,..
\
~~>
',:.'""""
CGL>
"='\
Aluminiurn
\
layer
I
After Step 1 (chew), Step 2 (cben~)
and Step 3 (dis+arge), the
drum sutiace potmtial becomes staNe and is ready fw operation.
Step 4: Charge (Main corona unit)
A negattie charge h -H
over the drum surface by the main
-rona unk A positfvecharge devebpe .mthe akmhh
kyer.
~Main""""'
I
-w --
,
J
'... -_ Q-'
I
'm
"-
SF-7300
SF-7350
OPC drum
J
Step
5: Exposure
Lig~ from &
copy k~
b p~eoted on the Origrndand rd~
ontothe dmm surface throughthe mhore and lens.
Since more @ht is rafbcted from light image areas of the ~nel,
the reepecttie drum area k exposed to more hte-
%h~ On the
other hand, W
l~ht is re-ed
from dti
image areas of the
originalso that tie respectie drum area b exposed to kss htense
l~M.
Negatie and postie
chagea -r
in the CGL The negatie
ch~e
caused in the CGL advances to the poetie charge m the
aluminiumkyer prduced at Step 4, and the positivecharge advsm
ces to the negatie charge on the drum sudace. Therefore, the
positive and negattie charge in the aluminium hyer ad the drum
surface where exposed to Ight neutrdhe each other and the drum
surface pote~al drops. Since the charge in the CGL is pr~-
tiorrateto the density of the original, more ch~e
is created in the
CGL areas exposed to more intense light.The decrease in the drum
sutiace poterrtid is greater as more of the drum surface negative
charge .S dksipated. On the other hand, the dak image portbn
(kss intensive light prqected area on the drum surface) has less
CGL charge creatbn, so that a less drum surface potential
decrease occurs. In this way, the ebctroetatic latent im~e
is
formedon the drum surface.
The dak image potion of the o~rnd r~ti
a bs
intense ligM
ba& to b
drum. This causes a bww ch~e
in the corresponding
areas
of the
CGL, whbh in turn muses tie
dmm surface potmdal.
or no dissipationof
Prqectfonof a l~ht
image area
(highl~M intensity)
Alumi
layer
cd~h
low)
Alumi
layer
Toner is then appfiedto the ktent image on the drum sudace in the
devebpment stage of ~
process. Tonw wiil be attractedby only
the hgher che~
or characterareas of the drum surfaceforminga
visiMeimage.
Step 6: Developing
Toner is attractedover the latent image area on the drum sufiace to
fm
a visbk hage. Toner is pos~~
chargedby frfctionwith the
carrier. The SF-73001SF-73W em~oys two mmponent magnetic
brush devebpirrg system end toner is attracted by the negsfie
charge on the drum sudace.
Since the drum surface potential b h~her in the da~ imqe area
(exposed to lees intense ~ht), more toner is thwefore attractedend
vi~ versa.
O : Cader (magneticpetide)
: Toner (charged positiveby friction)
OPC drum
AluminiumlayW CGL CTL
/
t
— —
--
I@
-- -* —
MG
roller
—200V
~
(bias)
I
5–7
—.—..—. . ... . .. .
. .
.. .. ..
Advertisement
Table of Contents
