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| 型号： | TS1024MBXX |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, XSS |
| 文件页数： | 5/5页 |
| 文件大小： | 124K |
| 代理商： | TS1024MBXX |
B372_TS
980525
Specications which provide more details for the proper and safe use of the described product are available upon request.
All specications are subject to change without notice.
Sensors
TS-L, -M, -H Series
Mechanical Sensors
Powder Level Sensors
The above illustration is a model of how unstable developer flow
leads to ripple in the detection output. If there is a comparatively
small uctuation in developer ow (C0
→C1→C0→C2→C0) around
the working point C0, this will be reected in an output ripple
between E1 and E2. As long as the uctuation in the output ripple
remains within the developer working range, the output signal lter-
ing is sufcient to ensure stable sensor characteristics. However, if
the ow of developer uctuates in a more unstable pattern, such as
C0
→C3→C0→C4→C0, the sensor saturation range may be
exceeded as shown by the output ripple peaks E3 and E4. In this
case sensing only takes place from P0 to P1, P2 to P3, and P5 to
P6. Sensing does not take place between P1 to P2, or P4 to P5 due
to saturation. Sensitivity is greatly reduced because of this.
It is possible of course to reduce the ripples through ltering. How-
ever, saturation reduces the sensitivity of the sensor itself. In order
to maintain the same high level of sensitivity as when there are
only small ripples below saturation levels after ltering, the sensi-
tivity needs to be increased in advance. Unfortunately, increasing
the sensitivity (increasing the sensitivity to changes in the ow of
developer), leads to a larger output ripple. Not only this, but as the
S/N ratio does not change when sensitivity is increased, there is
no increase in control accuracy, and sensor environmental charac-
teristics are impaired as well, resulting in even more unstable
sensing.
The following is another reason for avoiding large ripples.
The previous diagram shows an extremely unstable case where
the developer ow uctuates between C1 and C2. In this model,
two sensors, A and B are installed. Apart from having different sat-
uration points they are identical sensors. "a" is the saturation point
for sensor A, and "b" is the saturation point of sensor B. With ow
uctuating as shown (C0
→C1→C0→C2→C0), there will be two out-
put ripples, E1(a) to E2, and E1(b) to E2. After ltering, the average
output EA and EB are of course different.
What this model shows is that two sensors with the same charac-
teristics in the working range before reaching saturation, have dif-
ferent outputs when there is a large ripple, causing further
problems with the sensitivity of the sensors. With a large ripple,
sensitivity must be adjusted individually in order to keep the output
level and sensitivity of each sensor the same. This is obviously an
extremely difcult task.
These problems indicate that the problem of output ripples is not
just a problem of lter characteristics, and the importance of the
stable operation of each installation is emphasized. As TDK pro-
grammable toner lters are equipped with a built in lter, any rip-
ples that appear in sensor output are what is left after ltering.
When designing the developer container it is best to temporarily
remove the sensor lter so that you can view the ripples directly
inuenced by developer instability.
5. Relation between sensor sensitivity and sensor output volt-
age.
TDK programmable toner sensors are set with an output center
value of 2.5V for the purposes of compatibility with other applica-
tions. When the output center values of 2.5V and 5V are compared
however, the 5V type has around two times the output voltage uc-
tuation of the 2.5V type, for the same toner density uctuation. This
shows that the 5V version has around half the sensitivity of the
2.5V version, at the same V/wt%. So the 5V type has far better
environment resistance characteristics than the 2.5V type. In view
of these things, the 5V type is recommended when designing a
new installation.
P1
E4
P2
E2
E0
P0
P3
P6
E1
P4
E3
P5
C1
C0
C3
C2
C4
Output
Toner density or equivalent
developer magnetic resistance
E2
C1
C0
C2
Output
Toner density or equivalent
developer magnetic resistance
a
b
E1(a)
E1(b)
EA
EB
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