JP5065959B2 - Electromagnetic shielding material joint structure - Google Patents

Description

  The present invention relates to a joining structure of plate-shaped electromagnetic shielding materials having conductivity.

  In order to prevent electromagnetic waves arriving from the outside into the room and electromagnetic waves leaking from the room to the outside, there is a structure in which electromagnetic waves from the outside or the room are shielded by spreading a conductive electromagnetic shielding material on the wall surface.

  When arranging a plurality of electromagnetic shielding materials on the wall surface, as shown in FIG. 8, a gap is generated between the electromagnetic shielding materials 100A and 100B by overlapping the edges of the adjacent electromagnetic shielding materials 100A and 100B. It is joined so that there is no. In such a joint structure, a spacer 101 in which a metal mesh is wound around a rubber material is sandwiched between the electromagnetic shielding materials 100A and 100B, thereby ensuring shielding performance at the overlapping portions of the electromagnetic shielding materials 100A and 100B. (For example, refer to Patent Document 1).

Japanese Patent Laid-Open No. 11-017383 (paragraph 0028, FIG. 5)

  However, in the above-described conventional joint structure, a gap is easily generated between the electromagnetic shielding materials 100A and 100B and the spacer 101 due to the bending of the edges of the electromagnetic shielding materials 100A and 100B and the secular change of the rubber material of the spacer 101. There is a problem that the shielding performance at the overlapping portion of the electromagnetic shielding materials 100A and 100B is deteriorated due to the decrease in the conductivity or the conductivity.

  Therefore, an object of the present invention is to solve the above-described problems and provide a joining structure of electromagnetic shielding materials that can maintain high shielding performance in the overlapping portion of the two electromagnetic shielding materials.

In order to solve the above problems, the present invention is a joint structure of four electromagnetic shield materials arranged vertically and horizontally , wherein the electromagnetic shield material is an upper right corner and a lower left corner of a rectangular plate having conductivity. And a folded portion is formed on the upper and left edges of the plate, and is disposed on the upper right on the surface of the right edge of the electromagnetic shielding material disposed on the upper left. Further, the folded portion formed on the left edge portion of the electromagnetic shielding material is overlapped, and the upper edge portion of the electromagnetic shielding material disposed on the lower left is disposed on the surface of the lower edge portion of the electromagnetic shielding material disposed on the upper left. The folded portion formed on the upper left corner of the electromagnetic shielding material arranged at the upper left is formed on the edge of the upper left corner of the electromagnetic shielding material arranged at the lower right. The folded part is overlapped Cage, each electromagnetic shielding material, in a state of being combined pressed by a fixing member fixed to the base material, is characterized in that it is fixed to the base member.

In order to solve the above-mentioned problem, another configuration of the present invention is a joint structure of four electromagnetic shield materials arranged vertically and horizontally, and the electromagnetic shield material is an upper left corner of a rectangular plate having conductivity. Part and lower right corner part is cut out, and the upper edge part and the right edge part of the plate are formed with a folded part, on the surface of the left edge part of the electromagnetic shielding material arranged at the upper right, The folded portion formed at the right edge of the electromagnetic shielding material arranged at the upper left is overlapped, and the electromagnetic shielding material arranged at the lower right is placed on the surface of the lower edge of the electromagnetic shielding material arranged at the upper right. On the surface of the lower left corner of the electromagnetic shielding material arranged at the upper right, the upper edge of the electromagnetic shielding material arranged at the lower left edge is overlapped with the folded portion formed on the upper edge of the material The folded portion formed on the The combined and the respective electromagnetic shielding material, in a state of being combined pressed by a fixing member fixed to the base material, is characterized in that it is fixed to the base member.

In this configuration, the edge of one of the electromagnetic shielding materials is folded back to increase the rigidity of the edge and prevent the edge from being deformed. Therefore, the edge can be finished flat. Further, the folded portion of one electromagnetic shield material exerts an elastic force toward the surface of the other electromagnetic shield material, and the two electromagnetic shield materials are pressed against each other by a fixing member, whereby one electromagnetic shield material is The folded portion of the material is strongly pressed against the surface of the other electromagnetic shield material.
Thereby, since the folding | returning part formed in one electromagnetic shielding material closely_contact | adheres to the other electromagnetic shielding material, the shielding performance in the overlapping part of each electromagnetic shielding material can be improved.

  In addition, since the durability of each member in the overlapping portion of the two electromagnetic shielding materials is high compared to the conventional joining structure in which the spacer formed of the rubber material is sandwiched between the two electromagnetic shielding materials, the high Shield performance can be maintained.

In the above-described bonded structure of the electromagnetic shielding material, the fixing member may be configured to penetrate the electromagnetic shielding material inside the folded portion of the electromagnetic shielding material.

According to the joining structure of the electromagnetic shielding material of the present invention, since the folded portion formed on one electromagnetic shielding material is in close contact with the other electromagnetic shielding material, it is possible to improve the shielding performance in the overlapping portion of each electromagnetic shielding material. it can.
Moreover, since the durability of each member in the overlapping part of the two electromagnetic shielding materials is high, high shielding performance can be maintained.

Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
In this embodiment, as shown in FIG. 3A, when a plurality of electromagnetic shielding materials 10... Are spread on a wall surface to shield electromagnetic waves from the outside or the room, adjacent electromagnetic shielding materials 10 and 10. An example of the joint structure used for the joint part will be described.
In addition, each electromagnetic shielding material 10 ... used for this embodiment has the same structure. In the following description, the top, bottom, left, and right of the electromagnetic shield material 10 correspond to the top, bottom, left, and right directions shown in FIG. Moreover, the surface of the electromagnetic shielding material 10 is a surface appearing on the paper surface of FIG. 3A, and the back surface is a surface on the opposite side.

The electromagnetic shielding material 10 shown in FIG.2 (b) is formed with the galvanized steel plate. The electromagnetic shielding material 10 is formed by cutting out a corner portion of a square steel plate P shown in FIG. 2A and folding the edge portion into a predetermined shape.
Specifically, the upper left corner of the steel plate P is cut out into a rectangular shape with a width of k and a height of 2k. Further, the upper right corner of the steel plate P is cut out in a rectangular shape having a width h and a height k + h. Furthermore, the lower left corner of the steel plate P is cut out into a rectangular shape with a width of k + h and a height of h.
As described above, after forming notches at three locations on the steel sheet P, the upper edge of the steel sheet P is folded back to the back side with a width of k. Further, the left edge of the steel plate P is folded back to the back side with a width of k. At this time, when the electromagnetic shielding material 10 is overlapped with another electromagnetic shielding material 10 by making the folded portion slightly open without being brought into close contact with the back surface of the steel plate P, the folded portion Is easily pressed against the surface of another electromagnetic shielding material 10.
As a result, as shown in FIG. 2B, the folded portions 11 and 11 are formed at the upper edge portion and the left edge portion, and the upper right corner portion and the lower left corner portion are cut out into a square shape. Is formed. Moreover, the L-shaped area | region formed in the right edge part and lower edge part of the electromagnetic shielding material 10 becomes the overlap 12 where the other electromagnetic shielding material 10 is piled up.

In addition, as shown in FIG. 2B, the electromagnetic shield material 10 is positioned on the inner side of the folded portion 11 and overlapped with the overlap 12 of the other adjacent electromagnetic shield material 10 (FIG. 3B). A plurality of upper mounting holes 13... Are formed at predetermined intervals along the left edge and the upper edge.
Further, when another electromagnetic shielding material 10 is superimposed on the overlap 12 of the electromagnetic shielding material 10 (see FIG. 3B), each upper mounting hole 13... Of the other electromagnetic shielding material 10. A plurality of lower mounting holes 14... Are formed at the communicating positions.

  Next, as shown in FIG. 1 (a), the left edge of one electromagnetic shielding material 10A is placed on the surface of the right edge of the other electromagnetic shielding material 10B, as shown in FIG. An example of overlapping parts will be described.

  As shown in FIG. 1B, when the left edge portion of one electromagnetic shielding material 10A is superimposed on the surface of the overlap 12 of the other electromagnetic shielding material 10B arranged on the wall surface of the base material W, the other The lower mounting hole 14 of the electromagnetic shielding material 10B communicates with the upper mounting hole 13 of one electromagnetic shielding material 10A.

With the two electromagnetic shielding materials 10A and 10B overlapped, a wood screw S (“fixing member” in the claims) is inserted into the mounting holes 13 and 14 from the surface side, as shown in FIG. Further, by screwing and fixing the wood screw S to the base material W, the overlapping portions of the electromagnetic shielding materials 10A and 10B are connected in the thickness direction, and the electromagnetic shielding materials 10A and 10B are pressed against each other. The base material W is fixed to the wall surface.
At this time, the folded portion 11 of the one electromagnetic shield material 10A exhibits an elastic force toward the surface of the other electromagnetic shield material 10B, and the folded portion 11 of the one electromagnetic shield material 10A becomes the other electromagnetic shield. It is pressed against the surface of the overlap margin 12 of the shield material 10B.
Further, by the pressing force of the wood screw S, the folded portion 11 of one electromagnetic shield material 10A is strongly pressed against the surface of the overlap 12 of the other electromagnetic shield material 10B, and the folded portion 11 becomes the surface of the other electromagnetic shield material 10B. Close contact with.

  Next, as shown in FIG. 3A, when arranging a plurality of electromagnetic shielding materials 10 in the vertical and horizontal directions, the electromagnetic shielding material 10 at the left end of the first step is arranged first, and the arrow A1 The electromagnetic shielding materials 10 are sequentially stacked in the direction. After arranging the first-stage electromagnetic shield materials 10..., The second-stage left-most electromagnetic shield material 10 is arranged below the first-stage left-most electromagnetic shield material 10. And the electromagnetic shielding material 10 is piled up in order in the direction of arrow A2. Similarly, the electromagnetic shielding material 10 at the left end of the third stage is arranged, and the electromagnetic shielding materials 10 are sequentially stacked in the direction of the arrow A3.

  Here, as shown in FIG. 3B, when the four electromagnetic shielding materials 10a, 10b, 10c, and 10d are arranged vertically and horizontally, the overlapping portion of the upper left electromagnetic shielding material 10a will be described.

  The left edge portion of the upper right electromagnetic shield material 10b is superimposed on the surface of the right edge portion of the overlap 12 of the upper left electromagnetic shield material 10a. At this time, since a notch is formed in the lower left corner of the upper right electromagnetic shielding material 10b, the upper right electromagnetic shielding material 10b is not superimposed on the lower right corner of the overlap 12 of the upper left electromagnetic shielding material 10a. .

  Further, the upper edge portion of the lower left electromagnetic shield material 10c is superimposed on the surface of the lower edge portion of the overlap 12 of the upper left electromagnetic shield material 10a. At this time, since a notch is formed in the upper right corner of the lower left electromagnetic shield material 10c, the lower left electromagnetic shield material 10c is not superimposed on the lower right corner of the overlap 12 of the upper left electromagnetic shield material 10a. .

The upper left corner of the lower right electromagnetic shielding material 10d is superimposed on the surface of the lower right corner of the overlap 12 of the upper left electromagnetic shielding material 10a.
In this way, the entire surface of the overlap 12 of the upper left electromagnetic shielding material 10a is covered with the edge portions of the adjacent electromagnetic shielding materials 10b, 10c, and 10d.

  In the present embodiment, the four electromagnetic shield materials 10a, 10b, 10c, and 10d are moved up, down, left, and right by forming notches in the lower left corner and upper right corner of each electromagnetic shield material 10a, 10b, 10c, and 10d. The two or more electromagnetic shielding materials are configured so as not to overlap each other when arranged. Therefore, the unevenness generated on the wall surface after the electromagnetic shielding materials 10a, 10b, 10c, and 10d are spread is reduced.

  In the present embodiment, when the four electromagnetic shield materials 10a, 10b, 10c, and 10d are mounted side by side vertically and horizontally, each electromagnetic shield material 10a, Except for the overlapping portions of 10b, 10c, and 10d, it is set so that a slight gap is formed between the electromagnetic shielding materials 10a, 10b, 10c, and 10d. Accordingly, a hole is formed in the region H surrounded by the four electromagnetic shielding materials 10a, 10b, 10c, and 10d. The area of the region H is the area of each electromagnetic shielding material 10a, 10b, 10c, and 10d. Since it is very small compared to the area, it does not affect the shielding performance.

In the joining structure of the electromagnetic shielding material 10 of the present embodiment, as shown in FIG. 1A, the edge of one electromagnetic shielding material 10A is folded back to increase the rigidity of the edge, and the edge is deformed. Since it becomes difficult, the edge can be finished flat. Further, the folded portion 11 of one electromagnetic shield material 10A exerts an elastic force toward the surface of the other electromagnetic shield material 10B, and the overlapping portion of the two electromagnetic shield materials 10A and 10B is secured by the wood screw S. By connecting in the thickness direction, the folded portion 11 of one electromagnetic shield material 10A is strongly pressed against the surface of the other electromagnetic shield material 10B.
Thereby, since the folding | returning part 11 of one electromagnetic shielding material 10A closely_contact | adheres to the surface of the other electromagnetic shielding material 10B, the shielding performance in the overlapping part of each electromagnetic shielding material 10A, 10B can be improved.
As shown in the graph of FIG. 4, the joining structure (graph B1) of this embodiment in which the folded portion 11 is sandwiched between the overlapping portions of the two electromagnetic shielding materials 10A and 10B, and the overlapping portion of the two electromagnetic shielding materials As a result of comparing the shielding performance with the conventional joining structure (graph B2) sandwiching the spacer, it was confirmed that the joining structure of this embodiment has higher shielding performance.
In addition, when the folding amount k (see FIG. 2A) of the folded portion 11 is about 15 mm and the interval between the fixing members S is about 80 mm, high shielding performance is exhibited, and the folding amount k is 30 mm. In this case, or when the interval between the fixing members S is set to about 160 mm, the shielding performance is slightly deteriorated.

  Further, compared with the conventional joining structure (see FIG. 8) in which a spacer formed of a rubber material is sandwiched between the two electromagnetic shielding materials 10A and 10B, the overlapping portion of the two electromagnetic shielding materials 10A and 10B. Since the durability of each member is high, high shielding performance can be maintained.

  In addition, galvanized steel plates are used for the electromagnetic shielding materials 10A and 10B, and even if white rust and oxide films are formed on the contact portions of the electromagnetic shielding materials 10A and 10B due to long-term use, Since the conductivity of the oxide film is relatively high, the electrical resistance of the contact portion can be stabilized and high shielding performance can be maintained.

The embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the spirit of the present invention.
For example, in the present embodiment, as shown in FIG. 3A, the electromagnetic shielding material 10 of the same shape is spread on the wall surface. However, as shown in FIG. 5, the electromagnetic shielding material of the above-described embodiment. By combining and spreading the electromagnetic shielding materials 20 and 30 narrower than 10, it is possible to deal with wall surfaces of various shapes.

  Moreover, in this embodiment, as shown to Fig.1 (a) and (b), in order to connect the overlap part of two electromagnetic shielding material 10A, 10B inside the folding | returning part 11 of 10 A of electromagnetic shielding materials. Although the wood screw S is provided, as shown in FIGS. 6A and 6B, the wood screw S may be provided in the folded portion 41 of one electromagnetic shield material 40A. Even with this configuration, shield performance equivalent to that of the above-described embodiment can be obtained.

Further, as a reference example of the present invention, as shown in FIGS. 7A to 7C, folded portions 61 and 61 are formed on both side edges of one electromagnetic shield material 60A, and the other adjacent electromagnetic shield is formed. One electromagnetic shielding material 60A may be arranged so as to cover the joint of the materials 10B and 10B from the surface side.
In this configuration, the seam of the other electromagnetic shielding material 10B, 10B is reliably closed by one electromagnetic shielding material 10A, and the folded portion 11 of the one electromagnetic shielding material 10A is further sealed by the other electromagnetic shielding material 10B. Therefore, the shielding performance of the seam between the two electromagnetic shielding materials 10B and 10B can be improved.
Further, after the other electromagnetic shield material 10B is laid on the wall surface without being overlapped, the shield performance can be enhanced by the one electromagnetic shield material 60A. Therefore, since it is not necessary to perform bending on the other electromagnetic shielding material 10B, the processing cost of the electromagnetic shielding material 10B can be reduced.

It is the figure which showed the junction structure of this embodiment, (a) is a cross-sectional perspective view of an overlap part, (b) is a plane cross-sectional view before superimposing an electromagnetic shielding material, (c) is a plane cross-section after superposition FIG. It is the figure which showed the electromagnetic shielding material of this embodiment, (a) is a front view before a process, (b) is a front view after a process. It is the figure which showed the joining structure of this embodiment, (a) is a front view when a plurality of electromagnetic shielding materials are spread, and (b) is a front view showing the overlapping part of four electromagnetic shielding materials. It is the graph which compared the shielding performance of the junction structure of this embodiment, and the conventional junction structure. It is the figure which showed the junction structure of other embodiment, and is the front view of the structure laid out combining the electromagnetic shielding material of a different shape. It is the figure which showed the junction structure of other embodiment, (a) is a cross-sectional perspective view of the structure which provided the wood screw in the folding | returning part, (b) is a plane cross-sectional view before fastening a wood screw. It is the figure which showed the joining structure of a reference example , (a) is a cross-sectional perspective view of the structure which formed the folding | turning part in the both-sides edge part, (b) is a plane sectional view before fastening a wood screw, (c) is a front view. is there. It is the cross-sectional perspective view which showed the conventional joining structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Electromagnetic shielding material 10A Electromagnetic shielding material 10B Electromagnetic shielding material 10a Electromagnetic shielding material 10b Electromagnetic shielding material 10c Electromagnetic shielding material 10d Electromagnetic shielding material 11 Folding part 12 Overlay P Steel plate W Underlaying material

Claims (3)

It is a joint structure of four electromagnetic shielding materials arranged vertically and horizontally ,
The electromagnetic shielding material is formed by cutting out the upper right corner and the lower left corner of a rectangular plate having conductivity, and forming a folded portion on the upper edge and the left edge of the plate,
On the surface of the right edge portion of the electromagnetic shielding material disposed on the upper left, the folded portion formed on the left edge portion of the electromagnetic shielding material disposed on the upper right is overlaid,
On the surface of the lower edge portion of the electromagnetic shielding material disposed on the upper left, the folded portion formed on the upper edge portion of the electromagnetic shielding material disposed on the lower left is overlaid,
On the surface of the lower right corner of the electromagnetic shielding material arranged at the upper left, the folded portion formed at the edge of the upper left corner of the electromagnetic shielding material arranged at the lower right is overlaid,
Each of the electromagnetic shielding materials is fixed to the base material in a state of being pressed against each other by a fixing member fixed to the base material. It is a joint structure of four electromagnetic shielding materials arranged vertically and horizontally ,
The electromagnetic shielding material is formed by cutting out the upper left corner and the lower right corner of a rectangular plate having conductivity, and forming a folded portion on the upper edge and the right edge of the plate,
On the surface of the left edge portion of the electromagnetic shielding material disposed on the upper right, the folded portion formed on the right edge portion of the electromagnetic shielding material disposed on the upper left is superimposed,
On the surface of the lower edge portion of the electromagnetic shielding material arranged at the upper right, the folded portion formed on the upper edge portion of the electromagnetic shielding material arranged at the lower right is overlaid,
On the surface of the lower left corner of the electromagnetic shielding material arranged at the upper right, the folded portion formed at the edge of the upper right corner of the electromagnetic shielding material arranged at the lower left is superimposed,
Each of the electromagnetic shielding materials is fixed to the base material in a state of being pressed against each other by a fixing member fixed to the base material. 3. The electromagnetic shielding material joining structure according to claim 1 , wherein the fixing member penetrates the electromagnetic shielding material inside the folded portion of the electromagnetic shielding material.

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