Image Processing Reference
In-Depth Information
T
d
t
gt
d
,
1
exp
1
t
d
¼
(
10
:
67
)
t
d
,
K
d
T
d
t
g
þ
exp
where
t
d,
1
is the actual developer layer thickness
T
d
is the nip dwell time
L
U
mag
¼
, where L is the nip width and U
mag
is the speed
of the magnetic roll
t
is the developer charge relaxation time constant, which is given by
t
d
,
K
d
þ
t
K
p
g
þ
K
d
e
0
g
d
t ¼
(
:
)
10
68
t
K
p
g
þ
Figure 10.46 show the image after applying the development process. Table 10.13
shows typical parameters used for modeling the development MTF. The input to
the model is the latent image on the PR and the output is the DMA on the PR. Each dot
is developed using the dot printer model.
Similarly, the transfer process can be modeled using the dot transfer models
shown in Table 10.8 and the pro
le functions of the transfer process. The input to the
Latent image on the
p
hotoreceptor (V)
Develop
e
d image
Development
model
DMA
200
1
0
0.8
0.6
-200
0.4
-400
0.2
-600
V
bias
-800
0
Type (CAD/DAD)
tribo, model parameters
0
0
10
10
40
40
20
30
30
20
20
20
30
30
10
10
40
0
40
0
FIGURE 10.46
Developed image on the photoconductor.
TABLE 10.13
Parameters Used in the Development MTF
t
d
¼
400
10
3
mm
Thickness of the brush
K
d
¼
4.6
Dielectric constant
of the developer
10
3
mm
g
¼
10
Air gap
10
3
mm
t
p
¼
25
PR thickness
K
p
¼
3
PR dielectric constant
e
0
¼
8.854
10
14
C
=
V-cm
Permittivity of free space
g
d
¼
1.2
10
10
(ohm-cm)
1
Developer conductivity
T
d
¼
4
10
3
s
Nip dwell time
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