JPS6350761Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention allows the reed switch to be placed in a switched-on state by bringing it relatively close to the reed switch, and then to move it relatively away from the reed switch from that state. Then,
The present invention relates to an improvement in a reed switch magnet used to turn off the reed switch.

Conventionally, a reed switch magnet as described below with reference to FIG. 1 has been proposed.

That is, the reed switch is shown as a whole by S in FIG. 1, and a pair of reed pieces 2A and 2B are inserted into the tube body 1, which is filled with an inert gas, from the outside of its opposite ends. As a whole, it is shown as M as having a configuration in which the pipe body 1 is extended in the axial direction, and the free ends thereof are used as contacts 3A and 3B, and a small gap 4 is formed between them. The magnet 5 is made up of a single bar-shaped permanent magnet 5.

According to the reed switch magnet M made of such a permanent magnet 5, the magnetization direction of the reed switch magnet 5 is approximately parallel to the axial direction of the tube body 1 of the reed switch S. When the relationship is maintained and the reed switch S is brought relatively close to the reed switch S, the magnetic flux from the permanent magnet 5 magnetizes the contacts 3A and 3B of the pair of reed pieces 2A and 2B of the reed switch S to opposite polarities. and thereby,
The contacts 3A and 3B can be brought into contact, and the reed switch S can therefore be turned on.

In addition, if the reed switch magnet is relatively separated from the reed switch S in such a state, the pair of reed pieces 2A of the reed switch S
The contacts 3A and 3B of and 2B can be separated, and the reed switch S can therefore be turned off.

However, in the case of the conventional reed switch magnet M shown in FIG. Since it is used while maintaining a relationship that is almost parallel to the axis direction of 1,
Generally, the magnetic flux spreading from the reed switch magnet M toward the reed switch S is within the length range of the reed switch magnet M as seen in the axial direction of the reed switch S tube body 1, as shown by reference numeral 6. , it can only be obtained that a closed loop of magnetic flux is uniquely and gently expanded toward the reed switch S side.

Therefore, when the reed switch magnet M is brought relatively close to the reed switch S, when the reed switch S is turned on due to the magnetic flux from the permanent magnet 5, the reed switch magnet Distance D between M and reed switch S
However, it has to be relatively short. Therefore, there is a drawback that the sensitivity for turning the reed switch S into the switch-on state cannot be made high.

Therefore, the present invention aims to propose a novel magnet for a reed switch that does not have the above-mentioned drawbacks, and this will become clear from the following detailed description of the embodiments of the magnet for a reed switch according to the present invention. Will.

FIG. 2 shows an embodiment of the reed switch magnet according to the present invention.

In the magnet for a reed switch according to the present invention shown in FIG. 2, the reed switch is shown as S as a whole, as described above in FIG. A pair of lead pieces 2A and 2B extend in the axial direction of the tube body 1 from the outside of the opposite end positions, and use their free ends as contacts 3A and 3B, respectively, with a small gap 4 between them. The following configuration is provided as a configuration that has been formed and introduced.

That is, the whole is denoted by M, and the magnetic plate 1
1, first and second permanent magnets 13 and 14 arranged on the plate surface 12 at both ends thereof,
A third permanent magnet 15 is disposed on the plate surface 12 of the magnetic plate 11 at the center between the first and second permanent magnets 13 and 14.

In this case, the magnetic plate 11 may be rectangular.

In addition, the first, second and third permanent magnets 13, 1
4 and 15 may be rectangular parallelepipeds having approximately the same width as the magnetic plate 11 and having approximately the same size.

In addition, the first and second permanent magnets 13 and 14
, the direction of magnetization is the plate surface 12 of the magnetic plate 11.
, and their magnetic plate 11 sides have opposite polarities.

Further, the third permanent magnet 15 has a magnetization direction parallel to the plate surface 12 of the magnetic plate 11 and a magnetization direction of the third permanent magnet 15 .
And the second permanent magnets 13 and 14 form a closed loop 20 of magnetic flux, which will be described later, which is additively combined with a closed loop 18 of magnetic flux, which will be described later, extending to the space on the opposite side to the magnetic plate 11 side. It has a polarity of

In this case, the third permanent magnet 15 has a polarity opposite to that of the first and second permanent magnets 13 and 14 on the magnetic plate 11 side, respectively. There is.

The above is the configuration of the embodiment of the reed switch magnet according to the present invention.

According to the reed switch magnet body of the present invention having such a configuration, from the surface 16 of the first permanent magnet 13 on the opposite side to the magnetic plate body 11 side, the space on the opposite side to the magnetic plate body 11 side and enters the second permanent magnet 14 through the surface 17 of the second permanent magnet 14 opposite to the magnetic plate 11 side, and then enters the second permanent magnet 14.
Pass through the inside of the magnetic plate 11 from the end face 17' of the permanent magnet 14 on the magnetic plate 11 side, and then pass through the inside of the first permanent magnet 13 from the end face 16' of the first permanent magnet 13 on the magnetic plate 11 side. It forms a closed loop 18 for the magnetic flux that enters, and also spreads from the surface 19 of the third permanent magnet 15 on the first permanent magnet 13 side to the space on the opposite side to the magnetic plate 11 side to form a third magnetic flux. It passes through the surface 19' of the permanent magnet 15 on the second permanent magnet 14 side, and then the third
A closed loop 20 of magnetic flux entering the permanent magnet 15 is formed.

Therefore, it spreads from the first permanent magnet 13 side to the space opposite to the magnetic plate 11 side, enters the second permanent magnet 14 side, and then passes through the magnetic plate 11 to the first
a closed loop 18 of magnetic flux entering the permanent magnet 13 of;
A closed loop 21 of magnetic flux is additively synthesized with a closed loop 20 of magnetic flux that spreads from the third permanent magnet 15 to the space on the opposite side of the magnetic plate 11 and enters the third permanent magnet 15. It is formed.

Therefore, according to the embodiment of the reed switch magnet M according to the present invention shown in FIG.
and the third permanent magnets 13, 14, and 15 are placed on the reed switch S side, and the plate surface 12 of the magnetic plate 11 is approximately parallel to the axial direction of the tube body 1 of the reed switch S, so that the third permanent magnets 13, 14, and 15 are placed relative to the reed switch S. If they are placed close to each other, the closed loop 21 of the magnetic flux described above is formed, and the magnetic flux of the closed loop 21 of the magnetic flux causes the pair of reed pieces 2A of the reed switch S to
The contacts 3A and 3B of the reed switch S and 2B can be magnetized to opposite polarities and brought into contact with each other, and the reed switch S can be turned on.

In addition, if the reed switch magnet M is relatively separated from the reed switch S in such a state, the reed pieces 2A and 2 of the reed switch S can be separated from each other.
The contacts 3A and 3B of B can be separated,
Therefore, the reed switch S can be turned off.

Therefore, in the case of the reed switch magnet M according to the present invention shown in FIG. 2, as well as in the case of the conventional reed switch magnet M described above in FIG. or switch off.

However, in the case of the reed switch magnet M according to the present invention shown in FIG.
The state of the switch is the closed loop 24 of the combined magnetic flux of the closed magnetic flux loops 18 and 20 described above.
The closed loop 21 of the magnetic flux is different from the shape of the closed loop 6 of the magnetic flux described above in the case of the conventional reed switch magnet M shown in FIG. It has a large bulging shape.

For this reason, when the reed switch magnet M is brought relatively close to the reed switch S, the reed switch magnet M and the reed switch S change when the reed switch S is turned on by magnetic flux. Compared to the case of the conventional reed switch magnet M described above in FIG. 1, the distance D between
It can be made significantly longer.

Therefore, the sensitivity for turning the reed switch S into the switch-on state can be made much higher than in the case of the conventional reed switch magnet M described above in FIG.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view showing a conventional reed switch magnet. FIG. 2 is a schematic perspective view showing an embodiment of the reed switch magnet according to the present invention. DESCRIPTION OF SYMBOLS 11... Magnetic plate body, 12... Plate surface, 13... First permanent magnet, 14... Second permanent magnet, 15...
...Third permanent magnet, 15...Permanent magnet, M...Reed switch magnet.

Claims (1)

[Scope of Claim for Utility Model Registration] A magnetic plate; first and second permanent magnets respectively disposed on the plate surface of the magnetic plate at both ends thereof; , a third permanent magnet disposed in the center between the first and second permanent magnets, and the first and second permanent magnets are magnetized in the direction of the magnetic plate. The third permanent magnet is perpendicular to the plate surface and has opposite polarity on the side of the magnetic plate, and the third permanent magnet has a magnetization direction parallel to the plate surface of the magnetic plate and 1st and 2nd
A lead characterized in that it has a polarity that forms a closed loop of magnetic flux that is additively synthesized with a closed loop of magnetic flux that is spreading to the space opposite to the magnetic plate side by the permanent magnet. Magnet for switch.