JP2000311567A - Proximity switch device - Google Patents

Abstract

(57) [Problem] To provide a proximity switch device in which the size of the device is reduced, the usability is improved, and the security accuracy is improved. SOLUTION: At least two connection state switching means for switching an electric connection state between a contact state and a non-contact state, including at least two permanent magnets arranged so as to exhibit a predetermined polarity, are provided. A proximity switch, and having a magnetism of a polarity that is in a predetermined relationship with each of the polarities of the at least two permanent magnets, in proximity to the proximity switch,
A proximity switch device comprising a mover for switching all of the electrical connection states.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used when detecting the proximity of a permanent magnet to turn a switch into a closed or open state, for example, when opening or closing a door to activate an alarm or the like. The present invention relates to a proximity switch device.

[0002]

2. Description of the Related Art Conventionally, a permanent magnet is mounted on a movable side of a window sliding door or door, a proximity switch is arranged on a fixed side, and when the movable door or sliding door is opened, the contact of the proximity switch is opened. Alternatively, various proximity switches having a configuration in which the alarm device or the like is activated by controlling the switch to a closed state are sold.
Many conventional proximity switches use a so-called reed switch in which a magnetic contact piece is sealed in a glass tube.

[0003]

A conventional proximity switch has one built-in reed switch, and a permanent magnet as a movable element is fixed to, for example, a door, which is a movable portion opposed to the proximity switch. Will be installed. Then, for example, when the door is opened, the distance between the proximity switch and the permanent magnet as the mover becomes larger outside the region affected by the magnetic force, the reed switch is turned on (or off), and the door is opened. Detect that.

In the conventional proximity switch, in order to promote practical use, it is preferable that the distance between the proximity switch and the mover is large to some extent. However, if the distance between the proximity switch and the mover is to be increased, the permanent magnet as the mover must be increased, and miniaturization becomes difficult. In addition, there is a problem that the cost is increased by enlarging the permanent magnet.

[0005] It is an object of the present invention to provide a proximity switch device in which the size of the device is reduced, the usability is improved, and the security accuracy is improved.

[0006]

Means for Solving the Problems In order to solve the above-mentioned conventional problems, the inventors have conducted intensive studies. As a result, in the proximity switch device including the proximity switch and the movable element, when the connection state between the movable contact supported by the movable piece and the fixed contact arranged opposite to the movable contact is in the connected state, When a mover having magnetism of the same polarity as the magnetism of the permanent magnet arranged in the vicinity is brought close, a repulsive force is generated between the two, and the permanent magnet of the proximity switch rotates the movable piece, and the rotating power by the permanent magnet is reduced. Exceeding the force of the spring pushing down the movable piece downwards, the connection state between the movable contact supported by the movable piece and the fixed contact arranged opposite to the movable contact turned out to be disconnected. .

Therefore, when a plurality of permanent magnets are provided and the respective magnets are appropriately arranged, the switch can be switched only when all the electrical connection states of the proximity switch are disconnected or when the connection state is established. Was found to work, and the security accuracy was improved.

[0008] The present invention has been made based on the above-mentioned findings, and a first aspect of the proximity switch device of the present invention includes at least two permanent magnets arranged to exhibit a predetermined polarity. A proximity switch including at least two connection state switching means for switching an electrical connection state between a contact state and a non-contact state, and each of the polarities of the at least two permanent magnets and a predetermined switch. And a mover that has magnetism of a related polarity and is close to the proximity switch and that switches all of the electrical connection states.

A second aspect of the proximity switch device of the present invention is characterized in that the connection state switching means includes the following members. A. B. a plurality of movable pieces supported by the fulcrum so as to be capable of seesaw movement; B. a plurality of movable contacts mounted on the plurality of movable pieces; D. a fixed contact disposed opposite to the plurality of movable contacts; B. a biasing elastic body that pushes one end of the movable piece downward. The movable piece is attached to one end of each of the plurality of movable pieces, and the movable piece is fixed or rotated against the biasing elastic body by interaction with the magnetism of the mover to connect the movable contact and the fixed contact. A permanent magnet that switches states.

A third aspect of the proximity switch device according to the present invention is characterized in that all the switches constituted by the plurality of movable contacts and the fixed contacts are connected in parallel.

According to a fourth aspect of the proximity switch device of the present invention, the polarity of the mover includes a magnetic pole coinciding with each set magnetic pole of the plurality of permanent magnets,
Only when the movable element is brought close to the movable element, all of the connection state conversion means are changed to one of a connected state and a disconnected state.

In a fifth aspect of the proximity switch device of the present invention, the connection state switching means includes the following members. B. a plurality of movable pieces supported by the fulcrum so as to be capable of seesaw movement; B. a plurality of movable contacts mounted on the plurality of movable pieces; D. a fixed contact disposed opposite to the plurality of movable contacts; B. a biasing elastic body that pushes one end of the movable piece downward. Attached to each one end side of the plurality of movable pieces, the movable piece is rotated by interaction with the magnetism of the mover,
A permanent magnet that switches a connection state between the movable contact and the fixed contact, together with the biasing elastic body, and a polarity of the mover is formed of a magnetic pole that matches each set magnetic pole of the plurality of permanent magnets. Only when the movable element is brought close to the movable element, all of the connection state conversion means are changed to one of a connected state and a disconnected state.

[0013] The proximity switch of the present invention includes the following members. A. B. a plurality of movable pieces supported in a case so as to be capable of seesaw movement; B. a permanent magnet mounted on one end of each of the plurality of movable pieces; A plurality of movable contacts mounted on the plurality of movable pieces; E. a fixed contact disposed opposite to said plurality of movable contacts; A biasing spring for maintaining the movable contact in one of a state of contact with the fixed contact and a state of non-contact.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A proximity switch device according to the present invention comprises:
It consists of a proximity switch and a mover for operating the proximity switch. The proximity switch includes connection state switching means having at least two permanent magnets, and the connection switching means includes: B. a plurality of movable pieces supported by the fulcrum so as to be capable of seesaw movement; B. a plurality of movable contacts mounted on the plurality of movable pieces; D. a fixed contact disposed opposite to the plurality of movable contacts; E. a biasing elastic body that pushes down one end of the movable piece downward; Attached to each end of a plurality of movable pieces,
A permanent magnet is provided for switching the connection state between the movable contact and the fixed contact by rotating the movable piece against the biasing elastic body by fixing the movable piece by interaction with the magnetism of the mover. For example, two permanent magnets, two movable pieces, and two fixed contacts corresponding to the movable contacts of the movable piece are provided, and a spring is provided at one end of each movable piece, for example, on the permanent magnet side. .

The mover switches all the electrical connection states of the proximity switch in proximity to the proximity switch. The polarity of the mover has a predetermined relationship with each set magnetic pole of a plurality of, for example, two permanent magnets in the proximity switch,
For example, all of the connection state conversion means are switched to either the connection state or the disconnection state only when the magnetic poles are made of the same magnetic poles and the mover is brought close.

In the proximity switch, all switches constituted by a plurality of movable contacts and fixed contacts are connected in parallel.

According to the present invention, a plurality of movable pieces supported so as to be capable of seesaw movement are provided inside a case constituting a proximity switch, and a permanent magnet is mounted on one end of each of the movable pieces. Each movable piece is provided with a movable contact, a fixed contact is mounted on the case side facing the movable contact, and a bias spring for maintaining the movable contact in a contact state or a non-contact state with the fixed contact is provided.

With this configuration, by setting the directions of the magnetic poles of the permanent magnets mounted on the plurality of movable pieces to various combinations, all the movable pieces must be brought close to the magnetic poles that match the set magnetic poles. Does not work.

That is, unless the directions of the magnetic poles of the plurality of permanent magnets are matched and brought close to each other, all the switches constituted by the movable contact and the fixed contact do not change from the on state to the off state or the opposite state. As a result, all the switches can be operated only when the matched magnetic poles are brought close between the set magnetic poles, and the security accuracy is improved.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a proximity switch device according to the present invention will be described in more detail with reference to the drawings.
FIG. 1 shows an embodiment of the present invention. Reference numeral 10 shown in FIG.
Shows the whole proximity switch according to the present invention. 11 in the figure
Indicates a case made of a resin material or the like. Case 11
Have through holes 11A and 11B at both ends thereof.
The case 11 is attached to a window frame or the like using screws 1A and 11B.

Inside the case 11, movable pieces 12A and 12B supported so as to be capable of seesaw movement are arranged.
This embodiment shows a case where two sets of movable pieces are provided. Reference numeral 13 denotes a support for supporting the movable pieces 12A and 12B in a state where the movable pieces 12A and 12B can move in a seesaw motion. Permanent magnets 15A and 15B are mounted on one of the movable free ends of the movable pieces 12A and 12B. In the example shown in FIG. 1, both the permanent magnets 15A and 15B are
1 shows a case in which the N pole is arranged toward the outside of FIG. The biasing springs 16A and 16B are mounted on the rotating free ends on which the permanent magnets 15A and 15B are mounted, and the movable contacts 17A and 17B mounted on the opposite rotating free ends are brought into contact with the fixed contacts 18A and 18B, respectively. .

The fixed contacts 18A and 18B are connected in common as shown in FIG. 3 to derive a lead wire 19A and a lead 19B from the support 13 to form movable terminals 17A and 17B and fixed contacts 18A and 18B. Be done
The two switches are connected in parallel. These two switches are maintained always on in this example by biasing springs 16A and 16B. 14 shown in FIG. 1 is a movable piece 12A.
12A and 12B show counterweights for matching the weights of the respective free ends.

In this state, when the mover 20 shown in FIG. 2 is brought close, the permanent magnets 15A and 15B receive a repulsive force by the magnetic poles N of the magnets 21A and 21B attached to the mover 20, and the movers 12A and 12B Rotating in the directions of arrows A and B shown in FIG.
A, disconnect from 18B.

Accordingly, the two switches shown in FIG. 3 are both turned off. The mover 20 is attached to a door or the like, and the mover 20 is moved to the proximity switch 10 with the door closed.
, The proximity switch 10 is kept off when the door is closed. When the door opens,
Since the mover 20 is separated from the proximity switch 10, the movable contacts 17A and 17B contact the fixed contacts 18A and 18B at this time. An alarm device or the like can be operated by the contact signal.

Since the magnets 21A and 21B incorporated in the mover 20 have N poles facing outward, the permanent magnet mounted on the proximity switch 10 shown in FIG. A repulsive force is applied to 15A and 15B. Therefore, the movable contacts 17A and 17B are turned off by this repulsive force.

On the other hand, the magnet 21 provided on the mover 20
A or 21B is turned outward as shown in FIG.
In the case of the pole, the example of FIG. 4 shows a case where the magnet 21A has an S pole outward. When the directions of the magnetic poles of the magnets 21A and 21B are set as shown in FIG. 4, no repulsive force is generated on the permanent magnet 15A side even when the mover 20 approaches the proximity switch 10, so that the movable contact 17A is Fixed contact 18
A remains in contact, and the conduction between the lead wires 19A and 19B is not released.

Further, as shown in FIG. 5, both ends of a rod-shaped magnet 22 having a length L straddling the positions of the permanent magnets 15A and 15B of the proximity switch are connected to the permanent magnet 15A of the proximity switch shown in FIG. Even in the case of approaching 15B, no repulsive force is generated in the permanent magnet 15A on the side facing the S pole of the bar-shaped magnet 22. Therefore, also in this case, one of the switches shown in FIG. 3 is kept on, and both switches cannot be turned off.

In the above-described embodiment, the case where the same polarity is set outward is described. However, in the case where a magnet magnetized in the thickness direction such as a belt-like rubber magnet is used as a pseudo magnet, FIG. In the embodiment shown in FIG.
What is necessary is just to arrange | position the magnetic pole of 5A and 15B outward. Thus, it is easy to understand that the orientations of the magnets 15A and 15B are various and are not limited to the embodiment shown in FIG.

[0029]

As described above, according to the proximity switch device of the present invention, a plurality of permanent magnets are built in, and the proximity switch is miniaturized by utilizing the repulsive force between the mover and the permanent magnet. However, the arrangement distance between the mover and the permanent magnet can be increased. Further, unless the magnetic poles matching the polarities of the plurality of permanent magnets 15A and 15B provided in the proximity switch are approached from the outside, all of the plurality of switches cannot be turned off. That is, the switches do not operate unless the polarity directions of the permanent magnets 15A and 15B incorporated in the proximity switch match as prescribed.
As a result, a proximity switch with high security accuracy and high reliability can be provided.

As another application, by setting the polarity of a plurality of permanent magnets in various settings and arranging them, it can be used as a lock.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of a proximity switch according to the present invention.

FIG. 2 is a plan view for explaining an example of a mover that normally operates the proximity switch shown in FIG.

FIG. 3 is a connection diagram for explaining a structure of an electric circuit of the proximity switch shown in FIG. 1;

FIG. 4 is a plan view for explaining an example of a structure of a mover that cannot operate a proximity switch even when the proximity switch is brought close to the proximity switch shown in FIG. 1;

FIG. 5 is a front view showing an example of a permanent magnet in which the proximity switch cannot be operated even when approaching the proximity switch shown in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Proximity switch 11 Case 12A, 12B Movable piece 13 Support 14 Counter weight 15A, 15B Permanent magnet 16A, 16B Bias spring 17A, 17B Movable contact 18A, 18B Fixed contact 19A, 19B Lead wire 20 Mover 21A, 21B Magnet

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Toshio Kono 1990 Yasashi-cho, Asahi-ku, Yokohama-shi, Kanagawa Prefecture F-term in Sagami Electronics Industry Co., Ltd. 5G046 BA04 BD03 BD15 BD22

Claims (6)

[Claims] 1. At least two connection state switching means for switching an electrical connection state between a contact state and a non-contact state, comprising at least two permanent magnets arranged to exhibit a predetermined polarity. A proximity switch that has a polarity that is in a predetermined relationship with each of the polarities of the at least two permanent magnets, and switches all of the electrical connection states in proximity to the proximity switch. A proximity switch device comprising a movable element to be moved. 2. The proximity switch device according to claim 1, wherein said connection state switching means includes the following members. A. B. a plurality of movable pieces supported by the fulcrum so as to be capable of seesaw movement; B. a plurality of movable contacts mounted on the plurality of movable pieces; D. a fixed contact disposed opposite to the plurality of movable contacts; B. a biasing elastic body that pushes one end of the movable piece downward. The movable piece is attached to one end of each of the plurality of movable pieces, and the movable piece is fixed or rotated against the biasing elastic body by interaction with the magnetism of the mover to connect the movable contact and the fixed contact. A permanent magnet that switches states. 3. The proximity switch device according to claim 2, wherein all switches constituted by the plurality of movable contacts and fixed contacts are connected in parallel. 4. A method according to claim 1, wherein the polarity of the mover comprises a set magnetic pole of each of the plurality of permanent magnets, and the magnetic poles coincide with each other. The proximity switch device according to claim 1, wherein all of the means are changed to one of a connected state and a disconnected state. 5. The connection state switching means includes the following members. B. a plurality of movable pieces supported by the fulcrum so as to be capable of seesaw movement; B. a plurality of movable contacts mounted on the plurality of movable pieces; D. a fixed contact disposed opposite to the plurality of movable contacts; B. a biasing elastic body that pushes one end of the movable piece downward. The movable piece is attached to one end of each of the plurality of movable pieces, and the movable piece is fixed or rotated against the biasing elastic body by interaction with the magnetism of the mover to connect the movable contact and the fixed contact. The permanent magnet that switches the state, and the polarity of the mover, the set magnetic poles of the plurality of permanent magnets, and the same magnetic pole, and only when the mover is close, 2. The proximity switch device according to claim 1, wherein all of the connection state conversion means are changed to one of a connected state and a disconnected state. 6. A proximity switch comprising the following members. A. B. a plurality of movable pieces supported in a case so as to be capable of seesaw movement; B. a permanent magnet mounted on one end of each of the plurality of movable pieces; A plurality of movable contacts mounted on the plurality of movable pieces; E. a fixed contact disposed opposite to said plurality of movable contacts; A biasing spring for maintaining the movable contact in one of a state of contact with the fixed contact and a state of non-contact.