JPH07288076A - Electromagnetic relay - Google Patents

Abstract

PURPOSE:To provide an electromagnetic relay particularly suitable for a thin type by downsizing the whole body. CONSTITUTION:A movable piece 10 is formed of a flat magnetic substance, and a movable part 14 is formed by working the movable piece 10. Plural projected iron cores 2 are formed on a fixed piece 1 by projecting one surface of the flat magnetic substance. Coils 6 are wound round these iron cores 2, and an electromagnet is constituted. A circuit to pass a magnetic flux generated in the electromagnet of the fixed piece 1 is occupied by the fixed piece 1 and the movable piece 10 composed of a magnetic substance except a cavity between the fixed piece 1 and the movable part 14 of the movable piece 10. Thereby, magnetic attraction force of the electromagnet formed on the fixed piece is increased, and an electromagnetic relay is downsized, so that a thin electromagnetic relay can be provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic relay driven by electromagnetic force.

[0002]

2. Description of the Related Art A known example of a conventional electromagnetic relay is shown in Japanese Patent Laid-Open No. 5-114347.
As shown in FIG. 12 and FIG. 12, two through holes 21 are provided in a fixing piece 20 made of an electrically insulating substrate, and an iron core 22
The electromagnet 24 formed by winding the coil 23 around the through hole 2
1, the electromagnet 24 is attached to the fixed piece 20, and the movable piece 25 facing the electromagnet 24 is formed with a pair of movable portions 26 that rotate about the center as fulcrums on both sides of the centerline. An attracting portion 27 made of a magnetic material is formed on the surface of the movable portion 26 facing the electromagnet 24, and the tip of the movable portion 26 is fixed to the fixed piece 20 when attracted to the fixed piece 20 side. The movable contact 28 that comes into contact with and separates from the fixed contact 29 that is provided at.

[0003]

SUMMARY OF THE INVENTION In the above conventional configuration,
When an electric current is passed through the coil 23, the iron core 22 is excited to generate a magnetic flux, and the magnetic flux passes through the adsorption portion 27 of the movable portion 26 through the gap between the movable piece 25 and the fixed piece 20 to generate a magnetic attraction force. The magnetic attraction generated in the electromagnet 24 is passed through the space other than the gap between the movable piece 25 and the fixed piece 20. Therefore, the magnetic efficiency is improved. However, there is a problem that a large exciting current must be passed through the coil 23 in order to obtain a sufficient magnetic attraction force. Further, since the electromagnet 24 including the coil 23 and the iron core 22 is formed separately from the fixed piece 20, it is difficult to ensure the dimensional accuracy of the gap or the like during assembly, or it is difficult to reduce the size. There was a problem.

The present invention is intended to solve the above-mentioned problems, and is intended to provide an electromagnetic relay that is suitable for a thin type, in which the overall size is reduced.

[0005]

In order to achieve the above object, the invention of claim 1 is a magnetic surface having at least one surface made of a magnetic material, and a plurality of electromagnets are integrally formed on the magnetic surface. And a movable piece having a movable portion formed of a flat magnetic material, which is opposed to the plurality of electromagnets with a gap therebetween, and the movable portion is formed by a plurality of electromagnets. The other end is supported and fixed to the movable piece so that the one end moves to the electromagnet side by the magnetic attraction force of the generated magnetic field, and the contacts that come in contact with and separate from each other by the movement of the movable part correspond to the one end of the movable part and this one end. It is provided at the end of the fixed piece.

According to a second aspect of the invention, in the first aspect of the invention, a plurality of electromagnets are provided by winding coils around a plurality of projecting iron cores protruding from the magnetic surface of the fixed piece and connecting the coils in series. And a plurality of electromagnets are arranged so that a closed magnetic path is formed between the adjacent electromagnets through the movable portion, the magnetic surface of the fixed piece, and the gap.

According to a third aspect of the present invention, in the second aspect of the invention, a closed magnetic path is formed between one electromagnet and a plurality of electromagnets adjacent to the electromagnet via a movable portion, a magnetic surface of a fixed piece, and a gap. It is characterized in that a plurality of electromagnets are arranged so as to form The invention of claim 4 relates to claim 1 to claim 3.
In the invention, the permanent magnet is arranged between a plurality of electromagnets formed on the magnetic surface of the fixed piece.

[0008]

According to the first aspect of the invention, at least one surface is a magnetic surface made of a magnetic material, and a plurality of electromagnets are integrally formed on the magnetic surface. And a movable piece having a movable portion formed of a flat plate-shaped magnetic body, which are opposed to each other with a gap therebetween, and the movable portion has one end portion on the electromagnet side due to a magnetic attraction force of a magnetic field generated by a plurality of electromagnets. Since the other end is supported and fixed to the movable piece so that the movable part moves, the contacts that come into contact with and separate from each other by the movement of the movable part are provided at one end of the movable part and the end of the fixed piece corresponding to this one end. The movable part of the movable piece and the magnetic surface of the fixed piece are made of a magnetic material except for the gap between them, and the magnetic flux generated in the electromagnet penetrates the movable part of the movable piece and the magnetic surface of the fixed piece. To form a closed magnetic circuit, and Since it is possible to increase the force,
The contact pressure can be increased to improve contact reliability of the contacts, and malfunctions due to external vibrations and shocks can be prevented, and multiple electromagnets are integrally formed on the fixed piece, reducing the overall size. In addition, the current flowing through the electromagnet to obtain a predetermined magnetic attraction force can be reduced, and the gap between the movable portion of the movable piece and the magnetic surface of the fixed piece can be increased. As a result, the breakdown voltage between the contacts can be increased, and the breakdown voltage of the circuit that drives the movable portion by passing a current through the electromagnet can be lowered.

According to the second aspect of the present invention, the coils are wound around the plurality of projecting iron cores protruding from the magnetic surface of the fixed piece, and the coils are connected in series to form a plurality of electromagnets. Since a plurality of electromagnets are arranged between the electromagnets so as to form a closed magnetic path through the movable portion, the magnetic surface of the fixed piece, and the air gap, it is easy to integrally form a plurality of electromagnets on the magnetic surface of the fixed piece. And moreover,
Since a closed magnetic circuit is formed between adjacent electromagnets,
The magnetic attraction force acting on the movable portion can be further increased.

According to the third aspect of the invention, a closed magnetic path is formed between one electromagnet and a plurality of electromagnets adjacent to the electromagnet via the movable portion, the magnetic surface of the fixed piece, and the air gap. Since the plurality of electromagnets are arranged, it is possible to form a plurality of paths through which the magnetic flux generated by the electromagnets passes, and it is possible to further increase the magnetic attraction force acting on the movable portion.

According to the fourth aspect of the invention, since the permanent magnet is arranged between the plurality of electromagnets formed on the magnetic surface of the fixed piece, the magnetic flux generated by the permanent magnet is superposed on the path of the magnetic flux generated by the electromagnet. The magnetic attraction force acting on the movable portion can be further increased.

[0012]

EXAMPLES The present invention will be described below with reference to examples. (Embodiment 1) This embodiment is composed of a fixed piece 1 and a movable piece 10 as shown in FIG. 1, and has a structure in which the movable piece 10 is joined to the fixed piece 1.

As shown in FIG. 2, the movable piece 10 is of a flat plate type having a magnetic material made of, for example, an iron-nickel alloy as a base material, and has a movable contact 11, an insulating film 12, a bonding metal thin film layer 13 and the like. Is formed. The movable piece 10 is processed into a concave portion from its periphery by anisotropic etching, pressing, or the like, and the outer periphery is processed into a U-shape to be separated from the movable piece 10 and one end thereof is integrated with the movable piece 10. The movable part 14 which is connected to the support end 15 is integrally formed, and the movable part 14 swings and rotates around the support end 15.

Therefore, the movable portion 14 moves with respect to the iron core 2 of the fixed piece 1 described later. In addition, the fixed contact 3 of the fixed piece 1
A notch 16 is also provided at a corner of the movable piece 10 so that an electric signal can be taken out from the movable piece 10. The movable contact 11 is formed on the surface of the movable piece 10 at the free end side of the movable portion 14 on the insulating film 12 made of silicon oxide by a metal having a high conductivity such as gold. Due to the concave portion of 14, the contact gap between the fixed contact 3 and the movable contact 11 can be provided only by joining the fixed piece 1.

On the other hand, as shown in FIG. 3, the fixed piece 1, like the movable piece 10, is a flat plate-like one having a magnetic material made of an iron-nickel alloy or the like as a base material, and has a fixed contact 3, an insulating film 4, The metal thin film layer 5 for joining and the like are formed. Further, the fixed piece 1 is integrally formed with a large number of projecting iron cores 2 by projecting one surface thereof by pressing or the like, and these large number of iron cores 2 are arranged along the longitudinal direction of the fixed piece 1. They are arranged in a plurality of rows with a predetermined interval (however, in FIG. 3, a part is omitted for illustration).

A coil 6 is wound around each of a plurality of iron cores 2 formed on the surface of the fixed piece 1 facing the movable piece 10, and the iron cores 2 and the coils 6 constitute an electromagnet. The coil 6 is made of a wire material such as copper having a thin film or an insulating film, is formed around each iron core 2, is wound, and is connected to each other in series. As shown in FIG. 4, the winding directions of the coils 6 are opposite to each other in the adjacent iron cores 2.

An output terminal 7 is provided at a corner of the fixed piece 1 so that an electric signal can be taken out from the fixed contact 3 of the fixed piece 1. Further, an exciting current is passed through a coil 6 formed on the fixed piece 1. The input terminal 8 is provided at the corner of the fixed piece 1, and in order to expose the input terminal 8, a notch 17 is provided at the end of the movable piece 10 at a position corresponding to the input terminal 8.

The fixed contact 3 is located at an end position corresponding to the movable contact 11, and is made of a highly conductive metal such as gold on the insulating film 4 made of silicon oxide formed on the surface of the fixed piece 1. Has been formed. In addition, the fixed piece 1 and the movable piece 10
The metal thin film layers 5 for bonding formed on the respective are made of gold or a gold alloy layer, and the movable piece 10 is bonded to the fixed piece 1 by bonding both.

Now, in the electromagnetic relay of this embodiment,
When an exciting current is passed from the input terminal 8 to the coils 6, the exciting currents in the directions shown in FIG.
Is excited. Here, since the winding directions of the coils 6 wound around the adjacent iron cores 2 are opposite to each other, the directions of the magnetic fluxes generated at the adjacent iron cores 2 are also opposite to each other. Therefore, as shown in FIG. 5, the magnetic flux generated in the excited iron core 2 passes through the gap between the fixed piece 1 and the movable piece 10 and passes through the inside of the movable body 10 made of a magnetic material and the fixed piece 1. , The magnetic flux flows into the plurality of adjacent iron cores 2, and the fixed piece 1
A large number of closed magnetic paths are formed between the movable portion 14 and the movable portion 14 of the movable piece 10. As a result, the iron core 2 formed on the surface of the fixed piece 1
The movable portion 14 of the movable piece 10 made of a magnetic material is attracted toward the fixed piece 1 by the magnetic attraction force of the electromagnet composed of the coil 6 and the coil 6, and is formed at the end of the movable portion 14 on the free end side. This contact state is maintained as long as the movable contact 11 and the fixed contact 3 formed on the surface of the fixed piece 1 are in contact with each other and an exciting current is applied to the coil 6.

On the other hand, when the exciting current is no longer applied to the coil 6, the magnetic attraction force due to the electromagnet formed on the surface of the fixed piece 1 disappears, and the movable portion 14 is restored to its original state by the spring force and fixed. The contact 3 and the movable contact 14 are separated.
According to the above configuration, the path through which the magnetic flux generated in the plurality of electromagnets formed on the surface of the fixed piece 1 passes is formed of a magnetic material except for the gap between the fixed piece 1 and the movable portion 14 of the movable piece 10. Since the fixed piece 1 and the movable piece 10 occupy the magnetic resistance, it is possible to reduce the magnetic resistance as compared with the conventional configuration.
It is possible to increase the magnetic attraction force acting on. As a result, the contact pressure at the time of contact between the fixed contact 3 and the movable contact 11 can be increased, the contact reliability of the contact can be improved, and malfunction due to external vibration or shock can be made less likely to occur. .

Further, as compared with the conventional example, the magnitude of the exciting current to be applied to the coil 6 in order to obtain the same magnetic attraction force can be reduced. Further, since the gap between the movable contact 14 and the fixed contact 3 can be made larger than before, the breakdown voltage between the contacts can be increased, and a drive circuit for applying an exciting current to the coil 6 (not shown). It is also possible to lower the withstand voltage.

Further, since the iron core 2 constituting the electromagnet is integrally formed by processing the surface of the fixed piece 1, not only the electromagnet can be easily formed on the fixed piece 1, but also the entire size is reduced. Since a sufficient magnetic attraction force can be obtained even when the fixed piece 1 and the movable piece 10 are made of a thin film, an electromagnetic relay suitable for a thin type can be realized. Further, in this embodiment, the winding directions of the coils 6 wound around the adjacent iron cores 2 are opposite to each other, so that the directions of the magnetic fields of one electromagnet and a plurality of electromagnets adjacent thereto are opposite. Therefore, the path through which the magnetic flux generated in one electromagnet passes increases, and the magnetic attraction force of the electromagnet can be further increased.

(Embodiment 2) As shown in FIGS. 6 to 8, the basic structure of the electromagnetic relay of this embodiment is the same as that of the first embodiment, and therefore the same parts are designated by the same reference numerals. The description will be omitted, and only the characteristic parts will be described.
In the electromagnetic relay of this embodiment, as shown in FIGS. 6, 8 and 9, a plurality of cylindrical permanent magnets 9 are bonded to the fixed piece 1 on one surface of the fixed piece 1 on which an electromagnet is formed. The cores 2 are arranged adjacent to each other so as to be sandwiched between the cores 2. However, in the state where the exciting current is not applied to the coil 6,
The strength of the spring force of the movable portion 14, the number of the permanent magnets 9 and the strength of their magnetic poles are adjusted so that the movable portion 14 does not move due to the magnetic attraction force of the permanent magnet 9 and the fixed contact 3 and the movable contact 11 come into contact with each other. Has been set.

According to the above construction, as shown in FIG.
Since the magnetic flux generated from the iron core 2 excited by the exciting current flowing through the coil 6 and the magnetic flux generated from the permanent magnet 9 arranged adjacent to the iron core 2 are superposed through the same route, A closed magnetic circuit is formed not only between the electromagnets but also between the electromagnets and the permanent magnet 9. As a result, the magnetic attraction force acting on the movable portion 14 of the movable piece 10 can be further increased. Note that the other configurations and operations are the same as those of the electromagnetic relay of the first embodiment, so description thereof will be omitted.

[0025]

According to the invention of claim 1, at least one surface is a magnetic surface made of a magnetic material, and a plurality of electromagnets are integrally formed on the magnetic surface. And a movable piece having a movable portion formed of a flat plate-shaped magnetic body, which are opposed to each other with a gap therebetween, and the movable portion has one end portion on the electromagnet side due to a magnetic attraction force of a magnetic field generated by a plurality of electromagnets. Since the other end is supported and fixed to the movable piece so that the movable part moves, the contacts that come into contact with and separate from each other by the movement of the movable part are provided at one end of the movable part and the end of the fixed piece corresponding to this one end. The movable part of the movable piece and the magnetic surface of the fixed piece are made of a magnetic material except for the gap between them, and the magnetic flux generated in the electromagnet penetrates the movable part of the movable piece and the magnetic surface of the fixed piece. To form a closed magnetic circuit, and magnetic attraction that acts on the moving part Therefore, the contact pressure can be increased to improve the contact reliability of the contacts and prevent malfunctions due to external vibrations and shocks. Therefore, there is an effect that the entire size can be reduced. Further, there is an effect that a current flowing through the electromagnet can be reduced to obtain a predetermined magnetic attraction force. Furthermore, the gap between the movable part of the movable piece and the magnetic surface of the fixed piece can be increased to increase the breakdown voltage between the contacts and lower the breakdown voltage of the circuit that drives the movable part by passing a current through the electromagnet. There is an effect that can be done.

According to a second aspect of the present invention, coils are respectively wound around a plurality of projecting iron cores protruding from the magnetic surface of the fixed piece, and the coils are connected in series to form a plurality of electromagnets. Since a plurality of electromagnets are arranged so as to form a closed magnetic circuit through the movable part, the magnetic surface of the fixed piece and the air gap, it is possible to easily form a plurality of electromagnets integrally with the magnetic surface of the fixed piece. Moreover, since a closed magnetic path is formed between the adjacent electromagnets, there is an effect that the magnetic attraction force acting on the movable portion can be further increased.

According to the third aspect of the present invention, a plurality of electromagnets and a plurality of electromagnets adjacent to the electromagnets form a plurality of closed magnetic paths via the movable portion, the magnetic surface of the fixed piece, and the air gap. Since the electromagnets are arranged, it is possible to form a plurality of paths through which the magnetic flux generated by the electromagnets passes, and it is possible to further increase the magnetic attraction force acting on the movable portion.

According to the invention of claim 4, since the permanent magnet is arranged between the plurality of electromagnets formed on the magnetic surface of the fixed piece, the magnetic flux generated by the permanent magnet is superposed on the path of the magnetic flux generated by the electromagnet, and the movable portion is moved. It is possible to further increase the magnetic attraction force exerted on the magnet and to further reduce the current flowing through the electromagnet to obtain a predetermined magnetic attraction force.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a first embodiment.

FIG. 2 is a plan view of the movable piece of the above.

FIG. 3 is a plan view of the same fixing piece.

FIG. 4 is a plan view of the main part of the above.

FIG. 5 is a diagram for explaining the operation of the above.

FIG. 6 is a cross-sectional view showing a second embodiment.

FIG. 7 is a plan view of the movable piece of the above.

FIG. 8 is a plan view of the fixing piece of the above.

FIG. 9 is a plan view of the main part of the above.

FIG. 10 is a diagram illustrating an operation of the above.

FIG. 11 is an exploded perspective view showing a conventional example.

FIG. 12 is a sectional view of the above.

[Explanation of symbols]

 1 Fixed Piece 2 Iron Core 3 Fixed Contact 6 Coil 10 Moving Piece 11 Moving Contact 14 Moving Part

Claims (4)

[Claims] 1. A flat plate-shaped fixing piece in which at least one surface is made of a magnetic material, and a plurality of electromagnets are integrally formed on the magnetic surface, and the plurality of electromagnets face each other with a gap therebetween. And a movable piece having a movable part formed of a flat plate-shaped magnetic body are joined together, and the movable part has the other end so that one end moves to the electromagnet side by a magnetic attraction force of a magnetic field generated by a plurality of electromagnets. An electromagnetic relay in which a portion is supported and fixed to a movable piece, and contacts which are brought into contact with and separated from each other by movement of the movable portion are provided at one end of the movable portion and an end of the fixed piece corresponding to the one end. 2. A coil is wound around each of a plurality of projecting iron cores protruding from a magnetic surface of a fixed piece, and each coil is connected in series to form a plurality of electromagnets. The electromagnetic relay according to claim 1, wherein a plurality of electromagnets are arranged so as to form a closed magnetic circuit through the magnetic surface of the fixed piece and the air gap. 3. A plurality of electromagnets are arranged so as to form a closed magnetic path between one electromagnet and a plurality of electromagnets adjacent to the electromagnet via a movable part, a magnetic surface of a fixed piece and a gap. The electromagnetic relay according to claim 2, wherein: 4. A permanent magnet is arranged between a plurality of electromagnets formed on the magnetic surface of the fixed piece.
To the electromagnetic relay according to claim 3.