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DEVELOPMENT
4.4.2 Bias Control In Copy Cycle
The bias output is determined by five factors.
The total bias is described as;
ADS Mode:
Manual ID Mode:
V
:
Total bias
B
V
:
Base bias
BB
V
:
ADS Compensation
BA
V
:
User Tool mode ID Selection Compensation
BU
V
: Magnification Compensation
BMG
V
: Manual ID Selection Compensation
BM
1) Base Bias (V
As explained in the process control section, the base bias for development is
determined by the residual voltage (V
initial setting.
V
= V
+ (–220)
BB
R
2) ADS Compensation (V
V
BA
(negative)
According to the original background density, the bias is compensated. The
compensation value is determined with the voltage measured by the ADS
sensor (ADS sensor output: V
V
= 234 x (V
BA
ADS
NOTE: V
BA
V
= V
+ V
B
BB
V
= V
+ V
B
BB
)
BB
Drum
Potential
Dark
)
BA
–300
0
Dark
ADS
–2.3)
has a limited range from 0 V to –300 V.
+ V
+ V
BU
BMG
+ V
+ V
BU
BMG
V
D
V
L
V
Original Density
) measured in process control data
R
1.02 V
1
2
V
(V)
ADS
) as follows:
2-50
BA
BM
V
BB
R
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A176D559.wmf
2.3
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A176D560.wmf
15 July 1996
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