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參數(shù)資料
| 型號(hào)： | ort233 |
| 廠商： | OKI SEMICONDUCTOR CO., LTD. |
| 英文描述： | Reed Switch(舌簧開關(guān)) |
| 中文描述： | 干簧（舌簧開關(guān)） |
| 文件頁數(shù)： | 27/145頁 |
| 文件大小： | 729K |
| 代理商： | ORT233 |
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25
REED SWITCH
PRECAUTIONS AND APPLICATIONS
with a capacitor where large current flows
to charge the capacitor, thus requiring the
contact protection circuit. Fig. 1.3 shows
examples of protection circuits.
Figure 1.3
+E
+E
Is
R
R
R: Current limiting resistance
R should be determined to satisfy
Is < 0.5 A to 1A
R: Parallel resistance
R is put into the circuit to preheat
lamp filament and increase
the resistance. R is given by the
following.
R <Filament resistance
3
If no resistance is to be put into the circuit, use
ORD2211
1-4 Wiring capacitance
When wiring a load and reed switch over
long distance, electrostatic capacitance
arising from the cable can influence the
reed switch contact. Therefore, inductance
LS should be used. Ls value differs ac-
cording to the load current but should be
in the range of 0.5 to 5 mH.
( )
Load
Ls
Wiring
capacitance
50 m or more
2.
Reed Switch Lead Forming
When reed switches are used, usually the
leads are cut or bent. However, precau-
tions should be taken when performing
these processes.
Figure 2.2
(1) Cutting and bending positions must
be determined with reference to the
center of the contact or to the end of
the lead. If the position is measured
from the end of the glass tube, the
contact center position may be moved.
(2) When in cutting on bending the leads,
be sure to protect the sealing portions.
As shown in Figure 2.1, the lead should
be placed firmly by a jig.
(3) After the process, confirm that there is
no crack or chipping in the glass tube.
Lead bending
Lead cutting
Fixed jig
Fixed jig
Figure 2.1
2-1 Cutting the leads
Since the leads of a reed switch comprise
part of the magnetic circuit, shortening
the leads by cutting will cause the re-
quired ampere turns for pull-in and drop-
out to increase as shown in Fig. 2.2. Here
in this figure, a standard coil was used in
making measurements and there may be
differences when the reed switch is driven
by a permanent magnet depending on the
difference of the shape of magnet and
orientation of magnetization. Therefore,
it is necessary to actually examine the
change of the pull-in and drop-out values
by the magnet and drive method to be
used.
LEAD CUTTING LENGTH
1
+
2
mm
C
20
15
10
5
0
4
8
12
16
20
ORD234
ORD225
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