JPH06152180A - Connection structure of electromgnetic wave shielding member - Google Patents

Abstract

PURPOSE:To easily connect a plurality of electromagnetic waves shielding members formed by building conducting layers in the insides of board materials, while electric continuity of the conducting layers is kept. CONSTITUTION:Figure 2 is a part-enlarged view showing the state that, as a first embodiment, a first electromagnetic waves shielding member 3 and a second electromagnetic waves shielding member 5 are connected via a connection part 7, in an electromagnetic waves shielding board material 1. Since, as shown in the figure, the thickness of a first upper board material 33 is slightly different from that of a first lower board material 35, and the thickness of a second upper board material 53 is slightly different from that of a second lower board material 55, a first exposed part 39 of a first conducting mesh 31 is not electrically connected with a second exposed part 59 of a second conducting mesh 51, only by arranging the first electromagnetic waves shielding member 3 and the second electromagnetic waves shielding member 5, and engaging an engaging protrusion with an engaging recess 37. But electric continuity between the first conducting mesh 31 and the second conducting mesh 51 is ensured, because the connection part 7 is connected by using conducting adhesive agent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic wave shield member connection structure for shielding electronic parts and the like from electromagnetic waves and for preventing electromagnetic waves from leaking from the room to the outside.

[0002]

2. Description of the Related Art In recent years, various devices having a control microcomputer therein, for example, office equipment such as personal computers and printers, and household electric appliances such as washing machines and vacuum cleaners have rapidly spread. The number of microcomputers used has also increased, and along with this, the clock frequency has been increased. However, due to this high frequency,
Electromagnetic noise generated by electronic parts, etc. is radiated from the gaps between the housings that house each electronic part or from the room where the electronic parts are placed, affecting the surrounding signal lines, or electromagnetic waves from the outside and other Electromagnetic waves from electronic devices may directly act on electronic components and cause malfunctions or malfunctions.
Further, since the magnetic recording element of the electronic parts is magnetized at a high density with a small magnetic energy, it may be adversely affected by the loss of recorded information due to an external magnetic field from an electromagnet or the like.

Conventionally, as an electromagnetic wave shield member for blocking all or part of such static electricity and magnetic induction, a conductive layer (for example, a conductive substance containing titanium) is chemically vapor-deposited on the surface of glass or the like by sputtering. There is something that I made. However, simply depositing a conductive layer on the surface may cause chemical deterioration (corrosion) due to air or water contact with the formed conductive layer, or abrasion due to physical external force. was there. Therefore, for example, as in the electromagnetic wave shielding member disclosed in Japanese Patent Publication No. 2-60496, an electromagnetic wave shielding member that incorporates a conductive layer inside a plate material and shields the conductive layer from the outside has been proposed.

[0004]

However, such an electromagnetic wave shield member has a problem that it is difficult to form an electromagnetic wave shield member having a size and a shape according to the purpose. In other words, the electromagnetic wave shield member needs to be formed in various sizes and shapes depending on the place to which it is applied, but in consideration of cost efficiency and work difficulty, the electromagnetic wave shield member formed in advance to a certain size should be connected. It is desirable to be able to form it. In this case, the electromagnetic wave shield member formed by incorporating the conductive layer inside the plate member, if the conductive layer is not connected in the state of being in electrical contact,
It cannot fulfill its original function of blocking electromagnetic waves.

However, for example, when a mesh made of thin metal wires is used as the conductive layer, the thickness is slightly different due to various factors when the plate material is molded. It is difficult to electrically contact the mesh as a layer.
Conventionally, there has been no connection method that satisfies these conditions, so it has been difficult to form an electromagnetic wave shield member having a size and shape according to the purpose.

The present invention has been made to solve the above-mentioned problems, and a plurality of electromagnetic wave shield members formed by incorporating a conductive layer inside a plate material can be easily connected to each other while maintaining the electrical conductivity of the conductive layer. The purpose is to enable.

[0007]

In order to achieve the above object, the present invention adopts the following constitution. That is, it is a connection structure of a plurality of electromagnetic wave shield members in which a conductive layer is formed inside the plate material, each of the plurality of electromagnetic wave shield members has an exposed portion of the conductive layer at an end, and the exposed portions are electrically conductive. The gist is a connection structure of an electromagnetic wave shield member, which is characterized in that it is connected using a conductive adhesive.

[0008]

In the electromagnetic wave shield member connection structure of the present invention, the plurality of electromagnetic wave shield members each having the conductive layer formed inside the plate member are formed by connecting the exposed portions of the conductive layers at the ends with the conductive adhesive. Become. Therefore, the conductive layer will be displaced by simply aligning the cross sections of the electromagnetic wave shield member,
Even when not electrically contacted, the conductive adhesive ensures the electrical conductivity of each conductive layer. As a result, even a plurality of electromagnetic wave shield members each having a conductive layer formed inside the plate material can be easily connected while fulfilling a desired electromagnetic wave shield function.

[0009]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 shows a connection structure of an electromagnetic wave shield member 1 as a first embodiment. As shown in the figure, the electromagnetic wave shield plate material 1 is configured by connecting the first electromagnetic wave shield member 3 and the second electromagnetic wave shield member 5 by the connecting portion 7.

The first electromagnetic wave shield member 3 is composed of a first conductive mesh 31, a first upper plate member 33, a first lower plate member 35, and the like, and a recess 37 is provided at an end thereof. In addition, the first conductive mesh 31 of the first electromagnetic wave shield member 3
Has a first exposed portion 39 in the fitting recess 37 and is exposed to the outside.

The first electromagnetic wave shield member 3 is, for example, about 3
It is a 0 cm square electromagnetic wave shield material. The first conductive mesh 31 is a conductive mesh knitted by a known technique (for example, 3 mm square, 0.02 mm thin wire). This is a mesh that is as fine as possible, and it is desirable that it is a thin conductive wire. The first upper plate member 33 and the first lower plate member 35 are made of transparent acrylic resin by a two-color molding method. In this two-color molding method, one of the first upper plate member 33 and the first lower plate member 35 is first molded, the first conductive mesh 31 is arranged, and the first upper plate member is arranged on the side where the first conductive mesh 31 is arranged. 33 or the other of the first lower plate members 35 is molded.

The structure of the second electromagnetic wave shield member 5 is the first
As with the electromagnetic wave shield member 3, the second conductive mesh 5
1, a second upper plate member 53, a second lower plate member 55, etc.,
A fitting protrusion 57 is provided at the end. The second conductive mesh 51 of the second electromagnetic wave shield member 5 has the second exposed portion 59 on the fitting convex portion 57 and is exposed to the outside. The molding method is similar to that of the first electromagnetic wave shield member 3.

The connecting portion 7 is a connecting portion for connecting the fitting concave portion 37 of the first electromagnetic wave shield member 3 and the fitting convex portion 57 of the second electromagnetic wave shield member 5 by a tongue and groove with a conductive adhesive. Since the conductive adhesive electrically contacts the first exposed portion 39 of the first conductive mesh 31 and the second exposed portion 59 of the second conductive mesh 51, the electromagnetic wave shielding function of the electromagnetic wave shielding member 1 is impaired. Never.

As the conductive adhesive used here,
For example, it is based on an epoxy resin containing a metal powder such as silver powder as a conductive filler and is pasted with a solvent, and has an electric resistivity of about 10 ^-2 to 10 ^-3 Ω · m. The conductive adhesive has a property that a cured product exhibits conductivity and has a property of adhering to an adherend, and a curing method includes a room temperature curing type and a heat curing type. Further, it is desirable that the transparency is higher considering the appearance. Plate materials 33, 35, 53,
When a colored synthetic resin or the like is used for 55, a conductive adhesive of the same color may be used.

FIG. 2 is a partially enlarged view of the electromagnetic wave shield member 1 of the first embodiment. As shown in the figure, the first upper plate member 33
Since the thicknesses of the first lower plate member 35 and the second upper plate member 53 and the second lower plate member are subtly different, the first electromagnetic wave shield member 3 and the second electromagnetic wave shield member 5 are simply aligned and fitted into the fitting recess 37. The first exposed portion 39 of the first conductive mesh 31 and the second exposed portion 59 of the second conductive mesh 51 cannot be electrically connected to each other only by fitting the fitting convex portion 57. However, since the connecting portion 7 is connected by the conductive adhesive, the electrical conductivity between the first conductive mesh 31 and the second conductive mesh 51 is secured.

FIG. 3 shows an electromagnetic wave shield member 61 of the second embodiment. The electromagnetic wave shield member 61 includes a first electromagnetic wave shield member 63 and a second electromagnetic wave shield member 65.
It consists of two plates. The first electromagnetic wave shield member 63 and the second electromagnetic wave shield member 65 are connected at a connecting portion 67 with a conductive adhesive material. The difference from the first embodiment is that the first
The electromagnetic wave shield member 63 has two conductive meshes 63a,
It is formed by a five-layer structure having 63b inside, and the second
The electromagnetic wave shield member 65 includes three conductive meshes 65a to
It is a point formed by a 7-layer structure having 65c inside. Even when the shield members 63 and 65 have a multi-layered structure in order to enhance the function of shielding electromagnetic waves, the conductive adhesives of the connecting portions 67 are used to electrically connect the conductive meshes 63a, 63b, 65a to 65c. Sex is secured. Although an example in which the first electromagnetic wave shield member 63 having a five-layer structure and the second electromagnetic wave shield member 65 having a seven-layer structure are connected to each other has been shown here, a desired thickness and a multilayer structure may be adopted as necessary. In any case, electrical conductivity can be secured.

Although the general tongue and groove are used as the form of the connecting portion in the first and second embodiments, various connecting forms can be adopted as shown in FIG. For example, in FIG.
A scarf-shaped tongue and groove with a land shown in (a), a scarf-shaped tongue and groove shown in FIG. 4 (b), and a butt joint for adhesive bonding shown in FIG. 4 (c) can be used. it can.

As described above, the connection structure adopted by the electromagnetic wave shield member 1 of the present embodiment enables easy connection while maintaining the electrical conductivity of the conductive meshes 31 and 51 as the conductive layers. . Therefore, it is possible to form a highly versatile electromagnetic wave shield member 1 that can meet the requirements for the size and shape according to the purpose by connecting the electromagnetic wave shield members 3, 5 and the like that are formed in a predetermined size in advance. Become.

In this embodiment, an acrylic resin is used as a suitable material, but it is not always required to be an acrylic resin, and it may be molded with many known synthetic resins or glass. When an acrylic resin is used as the material for forming the plate members 33, 35, 53, 55 as in the present embodiment, the airtightness of the conductive mesh is reduced as compared with the case where the conductive mesh is incorporated using glass. Better water tightness can be secured. When glass is used, it is difficult to maintain airtightness or watertightness, and thus, usually only 3 to 5 years of use durability can be obtained.

Further, since the acrylic resin is used, it is easy to form various curved surfaces by heating with far infrared rays, and a desired shape can be formed according to the purpose. Further, by incorporating a conductive mesh in a synthetic resin such as acrylic, there is also an effect that the strength is increased. Further, as shown in the second embodiment, it is possible to have a multi-layer structure in which a plurality of conductive meshes are provided, and a more excellent electromagnetic wave shielding function can be achieved.

[0021]

As described in detail above, the electromagnetic wave shield member connection structure of the present invention allows a plurality of electromagnetic wave shield members formed by incorporating a conductive layer inside a plate member to maintain the electrical conductivity of the conductive layers. It became possible to connect easily in the state.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a connection structure of an electromagnetic wave shield member as a first embodiment of the present invention.

FIG. 2 is a partially enlarged view of the connection structure of the electromagnetic wave shield member.

FIG. 3 is an explanatory view showing a connection structure of an electromagnetic wave shield member as a second embodiment of the present invention.

FIG. 4 is an explanatory diagram illustrating another connection structure.

[Explanation of symbols]

1, 61 ... Electromagnetic wave shield member, 3, 63 ... First electromagnetic wave shield member, 5, 65 ... Second electromagnetic wave shield member, 7, 67 ... Connection portion, 31 ... First conductivity Mesh, 33 ... First upper plate material, 35 ... First lower plate material, 37 ... Fitting concave portion, 39 ... First exposed portion,
51 ... Second conductive mesh, 53 ... Second upper plate material,
57 ... Fitting convex portion, 59 ... Second exposed portion

Claims (2)

[Claims] 1. A connection structure of a plurality of electromagnetic wave shield members, wherein a conductive layer is formed inside a plate material, wherein each of the plurality of electromagnetic wave shield members has an exposed portion of the conductive layer at an end thereof. A connection structure of an electromagnetic wave shield member, characterized in that they are connected using a conductive adhesive. 2. The electromagnetic wave shield member connection structure according to claim 1, wherein the plate member is made of an acrylic synthetic resin, and the conductive layer is made of a conductive mesh.