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參數(shù)資料
| 型號： | 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)： | 28/145頁 |
| 文件大?。?/td> | 729K |
| 代理商： | ORT233 |
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26
REED SWITCH
2-2 Bending the leads
As in the case of cutting the leads, influ-
ence on the pull-in and drop-out charac-
teristics must be checked by actually us-
ing the magnet and the driving method
planned.
2-3 Measuring the electrical characteristics of
reed switches after cutting or bending.
When the leads of a reed switch are cut, it
is not possible to measure electrical char-
acteristics by using a standard test jig.
However, it is possible to measure these
characteristics after processing if a special
jig is made. It is also possible to measure
electrical characteristics of the reed switch
with a bent lead by using the jig similar to
the one used for a reed switch with a cut
lead. However, when both leads are bent,
the reed switch cannot be inserted into a
coil and therefore cannot be measured.
3.
Reed Switch Mounting
Generally, a reed switch is mounted by
soldering or welding. When the mount-
ing space (including its vicinity) is non-
magnetic, there is no influence on opera-
tion but when the material is magnetic,
operation characteristics do change. There-
fore, it is necessary to check these in con-
sideration of the assembling conditions.
3-1 Soldering
Leads are tin plated and are soldered ordi-
narily (250 to 300
°
C). When soldering,
keep the soldering point at least 1 mm
away from the glass end. In addition, there
is also a danger of causing the glass tube to
be damaged by heat if the soldering is
done for a long time. Keep the process to
less than five seconds.
3-2 Welding
When welding, also keep the welding
point at least 1 mm away from the glass
end. When using a large power supply for
welding, heat generated in lead may cause
damage to the glass tube. Precautions to
prevent this are necessary.
Welding current may also induce mag-
netic field and cause the reed switch to
operate. Therefore, it may introduce weld-
ing current to the contact and contact may
be melted. Precautions are also necessary.
3-3 Ultrasonic welding
Be very careful when using ultrasonic
welding methods to weld reed switches
or using ultrasonic welder in the vicinity
of a reed switch.
The ultrasonic can change the contact gap
and the characteristics of the reed switch.
3-4 Mounting on a printed circuit board
When mounting on a printed circuit board,
the reed switch should float on the board
as shown in Figure 3.1 or hole should be
opened in the printed circuit board to
prevent the glass from touching the board
surface. Otherwise, it is possible to cause
a damage to the glass tube because of
physical shocks or other adverse elements
applied externally to it.
4.
Reed Switch Resin Mold
Printed circuit board
Figure 3.1
When reed switches are molded with resin,
it is possible for the resin stress to break or
damage the glass tube. Therefore, the resin
should be selected carefully. Moreover, it
is necessary to perform temperature cycle
testing to ensure selection of safe resin
material.
On the other hand, there is no problem if
silicone or other soft resin is used.
5.
Dropping Reed Switches
Avoid dropping reed switches. If a reed
switch is dropped onto a hard surface
from a height more than 30 cm, it is pos-
sible to cause the characteristics to change.
If a reed switch has been dropped, care-
fully inspect its characteristics and exte-
rior appearance before use.
If a reed switch has been subjected to
shock more than 30 G, the pull-in value
may change.
PRECAUTIONS AND APPLICATIONS
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