Canon PC720 Service Manual - Page 32

Static, Latent, Image, Formation, Block

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INN COPYING PROCESS The copier's image formation block consists of the following steps; see the descriptions for each step given under its respective heading: Step 1: primary charging (-) Step 2: image exposure Step 3: development (AC + DC bias) Step 4: transfer (-) Step 5: separation (+) Step 6: fixing Step 7: drum cleaning The photosensitive drum consists of two layers: the outer layer being a photoconductive layer made of organic photoconductor (OPC) and inner layer, a substrate made of aluminum (conductor). Photoconducting layer Substrate Figure 2-103 B. Static Latent Image Formation Block The static latent image formation block consists of tow steps: primary charging and image exposure. At the end of this block, the areas on the photosensitive drum corresponding to the black areas of the original are left with negative charges and those corresponding to the white areas of the original are rid of negative charges. These images created by negative charges are not visible to the human eye and, therefore, are called static latent images. Time (t) 0 Light area -500 Surface potential (V) -.r------ -1000 Primary charging (step 1) Dark area Image exposure (step 2) Figure 2-104 2 - 2 COPYRIGHT 1994 CANON INC. CANON PC7201140750= REV.O AUG.1994 PRINTED IN JAPAN (IMPRIME AU JAPON)

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INN
COPYING
PROCESS
The
copier's
image
formation
block
con-
sists
of
the
following
steps;
see
the
descrip-
tions
for
each
step
given
under
its
respective
heading:
Step
1:
primary
charging
(-)
Step
2:
image
exposure
Step
3:
development
(AC
+
DC
bias)
Step
4:
transfer
(-)
Step
5:
separation
(+)
Step
6:
fixing
Step
7:
drum
cleaning
The
photosensitive
drum
consists
of
two
layers:
the
outer
layer
being
a
photoconduc-
tive
layer
made
of
organic
photoconductor
(OPC)
and
inner
layer,
a
substrate
made
of
aluminum
(conductor).
Photoconducting
layer
Substrate
Figure
2-103
B.
Static
Latent
Image
Formation
Block
The
static
latent
image
formation
block
consists
of
tow
steps:
primary
charging
and
image
exposure.
At
the
end
of
this
block,
the
areas
on
the
photosensitive
drum
corre-
sponding
to
the
black
areas
of
the
original
are
left
with
negative
charges
and
those
cor-
responding
to
the
white
areas
of
the
original
are
rid
of
negative
charges.
These
images
created
by
negative
charges
are
not
visible
to
the
human
eye
and,
therefore,
are
called
static
latent
images.
Surface
potential
(V)
-.r------
0
-500
-1000
Time
(t)
Light
area
Dark
area
Primary
charging
Image
exposure
(step
1)
(step
2)
Figure
2-104
2
-
2
COPYRIGHT
1994
CANON
INC.
CANON
PC7201140750=
REV.O
AUG.1994
PRINTED
IN
JAPAN
(IMPRIME
AU
JAPON)