JPH08250888A - Method for joining magnetic material in radio wave absorbing body and the magnetic material - Google Patents

Abstract

PURPOSE: To provide a radio wave absorbing body which is inexpensive and has high absorption characteristics. CONSTITUTION: In magnetic materials 1 having rough faces wherein a small gap is formed between end faces when the end faces are in contact with each other, the respective magnetic materials 1 are assembled and joined without a slit existing linearity through along a magnetic field direction. With the materials 1, a protrusion 2 is formed at an end of one of the magnetic materials 1 to be joined, while a recess 3 to be engaged with the protrusion 2 is formed at an end of the other material 1. In addition, a gradient face inclined at a predetermined angle in a magnetic field direction is formed at an end of one of the materials 1 of those to be joined to each other, while a gradient face to be engaged with the above tilted face is formed at an end of the other material 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an outer wall surface of a general building,
By using it for ceilings, inner wall surfaces, partition walls, floors, etc., it absorbs electromagnetic waves radiated from OA equipment used indoors to prevent leakage to the outside and flutter, beats, and pulses from the outside. Absorbs interference waves such as noise and ghost, and prevents radio interference of various equipment used indoors.
The present invention relates to a method for joining magnetic materials used in a radio wave absorber for forming a so-called anechoic chamber and the magnetic material.

[0002]

2. Description of the Related Art Conventionally, in buildings, offices, hospitals, etc. that use precision electronic equipment such as computers, from the viewpoint of preventing noise generation, malfunction, and leakage of information, it is necessary to prevent electromagnetic waves from penetrating each other indoors and outdoors. A different shielding means is required, for example, a magnetic material having a wide band characteristic of frequency dispersion of complex permeability, a metal material for reflecting electromagnetic waves toward the magnetic material, and an electromagnetic wave for imparting a function and appearance as a building material. A radio wave absorber in which a transparent inorganic material or the like is laminated is known.

[0003]

FIG. 10 shows a conventional electromagnetic wave absorber 11 of this type. The radio wave absorber 11 is an integral type radio wave absorber suitable as a dedicated material for construction, and includes a magnetic material 12 having radio wave absorption characteristics and a reflector 13 that reflects radio waves toward the magnetic material 12. The radio wave absorbing layer, the heat insulating layer (not shown) and the like are made of a base material 11A. Although it is structured to be sandwiched between 11B, in the radio wave absorber 11 of this type, the base material 11
A. It is difficult to integrally form the magnetic material 12 having substantially the same size as 11B from the viewpoint of cost. Therefore, in practice, it is necessary to continuously bond and use a plurality of magnetic materials.

However, the end surfaces of this kind of magnetic material have a rough surface, and when the end surfaces of the magnetic materials are brought into contact with each other, a gap is formed between the end surfaces. Therefore, when the magnetic materials are randomly joined, there is a problem that a void penetrating along the magnetic field direction is formed, radio waves leak from the void, and the radio wave absorption characteristics are significantly deteriorated.

[0005]

In order to solve the above-mentioned conventional drawbacks, the present invention provides a radio wave absorber using a plurality of magnetic materials, wherein one of the magnetic materials is bonded to the other. A protrusion is formed at the end of the magnetic material, and a recess is formed at the end of the other magnetic material that meshes with the protrusion, or an inclined surface is formed at the end of one magnetic material to be joined to each other. After forming an inclined surface that meshes with the inclined surface at the end of the magnetic material, the end surfaces of the magnetic materials are combined and joined together, or they are alternately stacked and joined to each other along the magnetic field direction. It eliminates the void that penetrates linearly.

Thus, it is possible to prevent the leakage of radio waves from the air gap, and to provide an inexpensive radio wave absorber having high radio wave absorption characteristics.

[0007]

It is an object of the present invention to provide a radio wave absorber which is inexpensive and has high radio wave absorption characteristics as described above.

[0008]

According to a first aspect of the present invention, there is provided a method for joining magnetic materials in a radio wave absorber, wherein a magnetic material having a rough surface in which a slight gap is formed between the end faces when the end faces are brought into contact with each other. In the material, the respective magnetic materials are combined and joined together in a state where there is no void penetrating linearly along the magnetic field direction. 4. The structure is such that a protrusion is formed at the end of one magnetic material to be joined to the magnetic material, and a recess that meshes with the protrusion is formed at the end of the other magnetic material. Among these, a structure in which an inclined surface that is inclined at a predetermined angle with respect to the magnetic field direction is formed at the end of one magnetic material to be joined to each other, and an inclined surface that meshes with the inclined surface is formed at the end of the other magnetic material Is.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention which has achieved such an object will be described with reference to the drawings of the following embodiments.

FIG. 1 is a side view of the magnetic material of the first embodiment of the present invention, FIG. 2 is a perspective view of the magnetic material of the first embodiment of the present invention, and FIG. 3 is a view of the magnetic material of the present invention. It is a side view of the magnetic material of 2nd Example, FIG. 4 is a perspective view of the magnetic material of 2nd Example of this invention, FIG. 5 is a side view of the magnetic material of 3rd Example of this invention. FIG. 6 is a perspective view of the magnetic material of the third embodiment of the present invention, FIG. 7 is a side view of the magnetic material of the fourth embodiment of the present invention, and FIG. FIG. 9 is a perspective view of a magnetic material of a fourth embodiment, FIG. 9 is a side view of a magnetic material of a fifth embodiment of the present invention, and FIG. 10 is a schematic sectional view of a conventional electromagnetic wave absorber.

The present invention is directed to a ceiling of a general building, inner and outer wall surfaces,
The present invention relates to a method of joining magnetic materials used in a radio wave absorber used for a partition wall, a floor, etc. and the magnetic material.
As shown in FIG. 9 to FIG. 9, the method of joining magnetic materials 1 according to claim 1 has a rough magnetic surface 1 in which a slight gap is formed between the end surfaces when the end surfaces are brought into contact with each other. 3. The method according to claim 2, wherein the respective magnetic materials 1 are combined and joined together in a state where there is no void penetrating linearly along the magnetic field direction. Among these, the gist is that the protrusion 2 is formed at the end of one magnetic material 1 to be joined to each other, and the recess 3 that meshes with the protrusion 2 is formed at the end of the other magnetic material 1.
The magnetic material 1 according to claim 3 forms an inclined surface 4 inclined at a predetermined angle with respect to the magnetic field direction to an end portion of one of the magnetic materials 1 to be mutually joined among the respective magnetic materials 1. The gist is that an inclined surface 5 that meshes with the inclined surface 4 is formed at the end of the other magnetic material 1.

That is, in order to easily obtain the desired thickness and size of the magnetic material 1 of the present invention, for example, a magnetic mass obtained by sintering a metal or a metal oxide is mechanically pulverized by a pulverizing mill or the like. Use one. This magnetic mass is, for example, Fe
₂ O ₃ , MnO, ZnO powder, etc. are mixed, molded with a binder such as polyvinyl alcohol (PVA), and then sintered for a predetermined time to obtain a high density of about 5 to 5.2 g / cc. Is.

Then, the crushed particles are classified and then re-molded to form a plurality of kinds of magnetic particles having different sizes of granular or powdery particles, and then the respective magnetic particles are mixed in a predetermined mixing ratio. In this state, they are temporarily molded by adhering them with a binder such as an epoxy type, an isocyanate type, a cyanoacrylate type, and pressurizing this with a pressure of about 1 ton / cm ²
A molded body having a density of about ± 0.2 g / cc is formed.

The magnetic material 1 as a molded body manufactured as described above has a lightweight structure and can be formed with a predetermined thickness and size. However, since the particles having different sizes are used, the end surface is formed. Is a rough surface. For this reason, when a plurality of them are joined, a slight gap is formed between the end faces.

1 and 2 are schematic views of a first embodiment of the present invention showing a joined state of a plurality of magnetic materials 1 formed as a molded body of this type.

In the magnetic material 1 of the first embodiment, a protrusion 2 and a recess 3 are formed at the end of one magnetic material 1 to be joined to each other. A recess 3 and a protrusion 2 that mesh with the protrusion 2 and the recess 3 are formed at the end of the other magnetic material 1. The gap between the end surfaces of the magnetic material 1 meanders in the magnetic field direction. It is formed.

3 and 4 are schematic diagrams of the second embodiment of the present invention, and FIGS. 5 and 6 are schematic diagrams of the third embodiment of the present invention.

The magnetic materials 1 of the second and third embodiments are
An inclined surface 4 that is inclined at a predetermined angle with respect to the magnetic field direction is formed at an end of one of the magnetic materials 1 to be bonded to each other among the magnetic materials 1. An inclined surface 5 that meshes with the inclined surface 4 is formed at the end of the other magnetic material 1, and the gap between the end surfaces of the magnetic material 1 is formed to be inclined in the magnetic field direction.

7 and 8 are schematic diagrams of the fourth embodiment of the present invention.

The magnetic material 1 of the fourth embodiment has an inclined surface 4 which is inclined at a predetermined angle with respect to the magnetic field direction to the end of one of the magnetic materials 1 of the magnetic materials 1 to be joined to each other. Recess 3
Are formed. An inclined surface 5 that meshes with the inclined surface 4 and a protrusion 2 are formed at the end of the other magnetic material 1, and the gap between the end surfaces of the magnetic material 1 is inclined in the direction of the magnetic field and has a dogleg shape. Is formed.

FIG. 9 is a schematic view of a fifth embodiment of the present invention in which a plurality of magnetic materials 1 formed as this type of molded body are used as they are without changing the end shape.

In the fifth embodiment, a plurality of magnetic materials 1 are vertically stacked (two in the embodiment), and the joint between the upper magnetic materials 1 is connected to the lower magnetic material 1. By arranging them so as to be displaced from the position of, the gap between the end faces of the magnetic material 1 is formed to meander in the magnetic field direction.

According to the present invention, as in the above-described embodiment, in the magnetic material 1 having a rough surface in which a small gap is formed between the end surfaces when the end surfaces are brought into contact with each other, each magnetic material 1 is Since the magnetic materials 1 are combined and joined in a state where there are no voids that linearly penetrate along the magnetic field direction, the contact area between the magnetic materials 1 increases and the gap spacing becomes narrower. Then, the rectilinear wave entering from the gap is efficiently absorbed.

As described above, according to the present invention, in a radio wave absorber using a plurality of magnetic materials, a protrusion is formed at the end of one of the magnetic materials, which is to be mutually joined. At the same time, a concave portion that meshes with the protrusion is formed at the end of the other magnetic material, or an inclined surface is formed at the end of one magnetic material that is joined to each other, and an inclined surface meshes at the end of the other magnetic material. After forming the inclined surface, by combining the end faces of the respective magnetic materials and joining them, or by alternately stacking them and joining them together, there is no gap that linearly penetrates along the magnetic field direction, Since it efficiently absorbs the rectilinear wave entering from the inside, it maintains a high electromagnetic wave absorption property, and as a result, it is a low cost suitable for use on the ceiling, wall, floor, etc. of general buildings that need to shield electromagnetic waves. And a lightweight structure that is easy to install Revolutionary provided a body which is and meaningful invention.

[Brief description of drawings]

FIG. 1 is a side view of a magnetic material according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a magnetic material according to the first embodiment of the present invention.

FIG. 3 is a side view of a magnetic material according to a second embodiment of the present invention.

FIG. 4 is a perspective view of a magnetic material according to a second embodiment of the present invention.

FIG. 5 is a side view of a magnetic material according to a third embodiment of the present invention.

FIG. 6 is a perspective view of a magnetic material according to a third embodiment of the present invention.

FIG. 7 is a side view of a magnetic material according to a fourth embodiment of the present invention.

FIG. 8 is a perspective view of a magnetic material according to a fourth embodiment of the present invention.

FIG. 9 is a side view of a magnetic material according to a fifth embodiment of the present invention.

FIG. 10 is a schematic sectional view of a conventional radio wave absorber.

[Explanation of reference numerals] 1 magnetic material 2 protruding portion 3 concave portion 4 inclined surface 5 inclined surface 11 radio wave absorber 11A base material 11B base material 12 magnetic material 13 reflector

Claims (3)

[Claims] 1. A magnetic material having a rough surface in which a slight gap is formed between the end surfaces when the end surfaces are brought into contact with each other, and the magnetic materials are linearly penetrated along the magnetic field direction. A method for joining magnetic materials in an electromagnetic wave absorber, characterized by combining and joining in the absence of voids. 2. The magnetic material used in the bonding method according to claim 1, wherein a protrusion is formed at an end of one of the magnetic materials to be bonded to each other. At the same time, a magnetic material is characterized in that a concave portion that meshes with the protrusion is formed at the end of the other magnetic material. 3. The magnetic material used in the bonding method according to claim 1, wherein one of the magnetic materials is bonded to the other end of the magnetic material in the magnetic field direction. While forming an inclined surface that inclines at a predetermined angle,
A magnetic material, wherein an inclined surface that meshes with the inclined surface is formed at an end of the other magnetic material.