JP4369472B2 - Electromagnetic shielding material - Google Patents

Electromagnetic shielding material Download PDF

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JP4369472B2
JP4369472B2 JP2006353547A JP2006353547A JP4369472B2 JP 4369472 B2 JP4369472 B2 JP 4369472B2 JP 2006353547 A JP2006353547 A JP 2006353547A JP 2006353547 A JP2006353547 A JP 2006353547A JP 4369472 B2 JP4369472 B2 JP 4369472B2
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conductive
base fabric
width
shielding material
protrusion
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JP2007150332A (en
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謹也 志津
嘉宏 平川
康憲 真部
文彦 原田
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Koyo Sangyo Co Ltd
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Description

本発明は、電磁波をシールドするために用いられる電磁波シールド材に関するものである。   The present invention relates to an electromagnetic shielding material used for shielding electromagnetic waves.

従来、この種の電磁波シールド材として、導電性を有する部材の表面にベース材が配設され、導電性繊維によって形成された導電性突起物がベース材の表面に立設され、更に導電性突起物及び導電性を有する部材がベース材の一部材である接続部材により電気的に接続された電磁波シールド材が開示されている（例えば、特許文献１参照）。この電磁波シールド部材では、上記導電性突起物がベース材の一部材であるシート材を貫通して、導電性を有する両面粘着テープ等の接続部材に接続される。また上記導電性突起物はベース材表面から離れるに従って先端が広がるように形成される。更に上記導電性を有する部材はシールドルームの扉枠であり、導電性突起物の先端はシールド扉に当接可能に構成される。   Conventionally, as this type of electromagnetic wave shielding material, a base material is disposed on the surface of a conductive member, and conductive protrusions formed of conductive fibers are erected on the surface of the base material. An electromagnetic wave shielding material in which an object and a member having conductivity are electrically connected by a connecting member which is a member of a base material is disclosed (for example, see Patent Document 1). In this electromagnetic wave shielding member, the conductive protrusion penetrates the sheet material which is one member of the base material, and is connected to a connection member such as a double-sided adhesive tape having conductivity. Further, the conductive protrusion is formed such that the tip is widened away from the surface of the base material. Further, the conductive member is a door frame of a shield room, and the tip of the conductive protrusion is configured to be able to contact the shield door.

このように構成された電磁波シールド材では、導電性突起物は扉枠の形状に合せて容易に変形するため、締付機構等の特別な機構を用いなくても電気的に接続できる。また導電性突起物で反射されずにこの導電性突起物に吸収された電磁波は、接続部材を通って扉枠に流れて放電される。この結果、導電性突起物に吸収された電磁波の扉枠及びシールド扉間への侵入を阻止できるので、電磁波がシールドルームに漏洩しないようになっている。
特開２００１−３２０１８８号公報（請求項１及び２、段落［０００５］、段落［００１０］） In the electromagnetic wave shielding material configured in this way, the conductive protrusion easily deforms in accordance with the shape of the door frame, and therefore can be electrically connected without using a special mechanism such as a tightening mechanism. Further, the electromagnetic wave absorbed by the conductive protrusion without being reflected by the conductive protrusion flows through the connecting member to the door frame and is discharged. As a result, the electromagnetic wave absorbed by the conductive protrusion can be prevented from entering between the door frame and the shield door, so that the electromagnetic wave does not leak into the shield room.
JP 2001-320188 A (Claims 1 and 2, paragraphs [0005] and paragraph [0010])

しかし、上記従来の特許文献１に示された電磁波シールド材では、導電性突起物がシート材を貫通して接続部材に植え込まれているだけであるため、導電性突起物がシート材及び接続部材から比較的容易に抜け落ちてしまう不具合があった。
また、上記従来の特許文献１に示された電磁波シールド材では、接続部材の導電率が比較的低く、導電性突起物で反射されずに導電性突起物に吸収された電磁波が接続部材を通って扉枠に速やかに流れないため、電磁波のシールド機能を十分に発揮できない問題点もあった。 However, in the electromagnetic wave shielding material disclosed in the above-mentioned conventional patent document 1, since the conductive protrusions are only implanted through the sheet material into the connection member, the conductive protrusions are connected to the sheet material and the connection material. There was a problem of falling off the member relatively easily.
Further, in the electromagnetic wave shielding material disclosed in the above-mentioned conventional Patent Document 1, the conductivity of the connecting member is relatively low, and the electromagnetic wave absorbed by the conductive protrusion without being reflected by the conductive protrusion passes through the connecting member. In addition, there is a problem that the electromagnetic wave shielding function cannot be sufficiently exhibited because it does not flow quickly into the door frame.

本発明の目的は、導電性突起物が基布から容易に脱落せず、電磁波をシールドする機能を確実に発揮できる、電磁波シールド材を提供することにある。
本発明の別の目的は、無突起物表面の存在により導電性突起物の接触密度の局所的な過密を阻止して、導電性突起物の塑性変形を防止でき、更に容易に施工できる、電磁波シールド材を提供することにある。 The objective of this invention is providing the electromagnetic wave shielding material which can exhibit the function which shields an electromagnetic wave reliably, without a conductive protrusion easily falling off from a base fabric.
Another object of the present invention is to prevent local overcrowding of the contact density of the conductive protrusions due to the presence of the non-protrusion surface, to prevent plastic deformation of the conductive protrusions, and to more easily apply electromagnetic waves. It is to provide a shielding material.

請求項１に係る発明は、図１に示すように、導電性枠部材の表面に配設されるシート材１２と、シート材１２の表面に立設された導電性繊維によって形成される導電性突起物１３と、導電性突起物３１と導電性枠部材とを電気的に接続する接続部材１４とを備えた電磁波シールド材の改良である。
その特徴ある構成は、シート材１２が、たて糸１２ａとよこ糸を織り上げて作られたて方向を長さ方向とする帯状の基布１２であり、導電性突起物１３が、基布１２のたて方向に複数本の導電性パイル糸１６を割り込ませて織り上げてパイル糸１６をカットすることにより基布１２の表面に突出して形成され、接続部材１４が、基布１２の裏面に導電性接着剤を塗布することにより形成された第１導電性接着剤層２１と、基布１２に第１導電性接着剤層２１を介して接着された導電性金属箔２３と、この金属箔２３の裏面に導電性接着剤を塗布することにより形成された第２導電性接着剤層２２とにより構成されたところにある。 As shown in FIG. 1, the invention according to claim 1 is a conductive material formed by a sheet material 12 disposed on the surface of the conductive frame member and conductive fibers erected on the surface of the sheet material 12. This is an improvement of the electromagnetic shielding material provided with the protrusion 13, and the connection member 14 that electrically connects the conductive protrusion 31 and the conductive frame member.
The characteristic configuration is a belt-like base fabric 12 in which the sheet material 12 is made by weaving warp yarns 12a and weft yarns, and the warp direction is the length direction. A plurality of conductive pile yarns 16 are inserted in the direction and woven to cut the pile yarns 16 so as to protrude from the surface of the base fabric 12, and the connection member 14 is formed on the back surface of the base fabric 12 with a conductive adhesive. A first conductive adhesive layer 21 formed by applying a conductive metal foil 23, a conductive metal foil 23 bonded to the base fabric 12 through the first conductive adhesive layer 21, and a back surface of the metal foil 23. It is in the place comprised with the 2nd conductive adhesive layer 22 formed by apply | coating a conductive adhesive.

この請求項１に記載された電磁波シールド材では、基布１２のたて方向に複数本の導電性パイル糸１６を割り込ませて織り上げてパイル糸１６をカットすることにより、導電性突起物１３を基布１２の表面に突出して形成したので、導電性突起物１３は基布１２から容易に脱落しない。また第１及び第２導電性接着剤層２１，２２の間に導電性金属箔２３を介装したので、第１及び第２導電性接着剤層２１，２２の導電率が比較的低くても、導電性突起物１３で反射されずに導電性突起物１３に吸収された電磁波は、上記導電性突起物１３や、この突起物１３に電気的に接続された導電性金属箔２３及び導電性枠部材等における内部ロスで消滅するか、或いはこれらの表面で反射して戻る。   In the electromagnetic wave shielding material according to claim 1, the conductive projections 13 are formed by cutting the pile yarns 16 by interrupting and weaving a plurality of conductive pile yarns 16 in the warp direction of the base fabric 12. Since the protrusion 13 is formed so as to protrude from the surface of the base fabric 12, the conductive protrusion 13 does not easily fall off the base fabric 12. In addition, since the conductive metal foil 23 is interposed between the first and second conductive adhesive layers 21 and 22, even if the conductivity of the first and second conductive adhesive layers 21 and 22 is relatively low. Electromagnetic waves absorbed by the conductive protrusions 13 without being reflected by the conductive protrusions 13, the conductive protrusions 13, the conductive metal foil 23 electrically connected to the protrusions 13, and the conductive properties. It disappears due to internal loss in the frame member or the like, or it is reflected by these surfaces and returns.

請求項２に係る発明は、請求項１に係る発明であって、更に図１に示すように、基布１２のたて糸１２ａ及びよこ糸間に浸透するように導電性塗料を基布１２に塗布し乾燥することによりバックコーティング層１７が形成されたことを特徴とする。
この請求項２に記載された電磁波シールド材では、導電性突起物１３の基部がバックコーティング層１７により基布１２に固定されるので、導電性突起物１３が基布１２から更に脱落し難くなる。 The invention according to claim 2 is the invention according to claim 1, further comprising applying a conductive paint to the base fabric 12 so as to penetrate between the warp yarn 12a and the weft yarn of the base fabric 12, as shown in FIG. The back coating layer 17 is formed by drying.
In the electromagnetic wave shielding material according to the second aspect, since the base portion of the conductive protrusion 13 is fixed to the base cloth 12 by the back coating layer 17, the conductive protrusion 13 becomes more difficult to drop off from the base cloth 12. .

請求項３に係る発明は、請求項１に係る発明であって、更に図４及び図５に示すように、帯状の基布１２の幅方向中央部、右側部及び左側部の少なくとも一部に導電性パイル糸を割り込ますことのない無突起物表面４１，４２又は４３が基布１２の長さ方向に形成されたことを特徴とする。
この請求項３に記載された電磁波シールド材では、導電性突起物１３の先端にドアなどが当接しても、導電性突起物１３の接触密度が局所的に過密になるのを無突起物表面４１，４２又は４３が阻止するので、導電性突起物１３の倒れなどの塑性変形を防止できる。 The invention according to claim 3 is the invention according to claim 1, and further, as shown in FIGS. 4 and 5, at least a part of the center portion in the width direction, the right side portion, and the left side portion of the belt-like base fabric 12. The protrusion-free surface 41, 42 or 43 that does not interrupt the conductive pile yarn is formed in the length direction of the base fabric 12.
In the electromagnetic wave shielding material according to claim 3, even if a door or the like abuts on the tip of the conductive protrusion 13, the contact density of the conductive protrusion 13 is locally overcrowded. Since 41, 42 or 43 blocks, plastic deformation such as the collapse of the conductive protrusion 13 can be prevented.

図１又は図３に示すように、帯状の基布１２の全幅をｗ(mm)とし、突起物１３の基布１２表面からの高さをｈ(mm)とするとき、次の式（１）を満たすことが好ましい。
３／２５≦ｈ／ｗ≦２５／２５ … （１）
また図３に示すように、帯状の基布１２の全幅をｗ(mm)とし、幅方向中央部の無突起物表面４１の幅をｐ1(mm)とし、右側部の無突起物表面４２の幅をｐ2(mm)とし、左側部の無突起物表面４３の幅をｐ3(mm)するとき、次の式（２）を満たすことが好ましい。
５／２５≦（ｐ1＋ｐ2＋ｐ3）／ｗ≦１６／２５ … （２）
但し、式（２）においてｐ1＞０、ｐ2＞０、ｐ3＞０である。
更に図３に示すように、幅方向中央部の無突起物表面４１の幅ｐ1(mm)と右側部の無突起物表面４２の幅をｐ2(mm)と左側部の無突起物表面４３の幅ｐ3(mm)とが次の式（３）を満たすこともできる。
４／１０≦（ｐ2＋ｐ3）／ｐ1≦３０／１０ … （３）
但し、式（３）においてｐ2＝ｐ3＞０、ｐ1＞０である。 As shown in FIG. 1 or FIG. 3, when the total width of the belt-like base fabric 12 is w (mm) and the height of the protrusion 13 from the surface of the base fabric 12 is h (mm), the following formula (1 ) Is preferably satisfied.
3/25 ≦ h / w ≦ 25/25 (1)
Further, as shown in FIG. 3, the entire width of the belt-like base fabric 12 is w (mm), the width of the non-projection surface 41 at the center in the width direction is p 1 (mm), and the non-projection surface 42 on the right side. Is set to p 2 (mm), and the width of the non-projection surface 43 on the left side is set to p 3 (mm), it is preferable to satisfy the following formula (2).
5/25 ≦ (p 1 + p 2 + p 3 ) / w ≦ 16/25 (2)
However, in Formula (2), p 1 > 0, p 2 > 0, and p 3 > 0.
As further shown in FIG. 3, the width p 1 (mm) and no projections surface of the width of the non-projection surface 42 of the right side portion p 2 and (mm) left side of the free projections surface 41 in the width direction central portion The width p 3 (mm) of 43 can also satisfy the following expression (3).
4/10 ≦ (p 2 + p 3 ) / p 1 ≦ 30/10 (3)
However, in Formula (3), p 2 = p 3 > 0 and p 1 > 0.

以上述べたように、本発明によれば、シート材である基布のたて方向に複数本の導電性パイル糸を割り込ませて織り上げてパイル糸をカットすることにより、導電性突起物を基布の表面に突出して形成したので、導電性突起物は基布から容易に脱落しない。この結果、電磁波シールド材の耐久性を向上できる。また上記基布の裏面に第１導電性接着剤層を介して導電率の高い導電性金属箔を接着し、この金属箔の裏面に第２導電性接着剤層を形成したので、第１及び第２導電性接着剤層の導電率が比較的低くても、導電性突起物で反射されずに導電性突起物に吸収された電磁波が上記導電性突起物や、この突起物に電気的に接続された導電性金属箔及び導電性枠部材等における内部ロスで消滅するか、或いはこれらの表面で反射して戻る。この結果、本発明の電磁波シールド材は電磁波をシールドする機能を確実に発揮できる。   As described above, according to the present invention, the conductive protrusions are formed by cutting a pile yarn by interrupting and weaving a plurality of conductive pile yarns in the warp direction of the base fabric that is a sheet material. Since the protrusion is formed on the surface of the cloth, the conductive protrusion does not easily fall off the base cloth. As a result, the durability of the electromagnetic wave shielding material can be improved. In addition, since the conductive metal foil having high conductivity is bonded to the back surface of the base fabric through the first conductive adhesive layer, and the second conductive adhesive layer is formed on the back surface of the metal foil, Even if the conductivity of the second conductive adhesive layer is relatively low, the electromagnetic waves absorbed by the conductive protrusions without being reflected by the conductive protrusions are electrically transmitted to the conductive protrusions and the protrusions. It disappears due to internal loss in the connected conductive metal foil and conductive frame member or the like, or it is reflected back from these surfaces. As a result, the electromagnetic wave shielding material of the present invention can reliably exhibit the function of shielding electromagnetic waves.

また基布のたて糸及びよこ糸間に浸透するように導電性塗料を基布に塗布し乾燥することによりバックコーティング層を形成すれば、導電性突起物の基部がバックコーティング層により基布に固定されるので、導電性突起物が基布から更に脱落し難くなる。
また帯状の基布の幅方向中央部、右側部及び左側部の少なくとも一部に導電性パイル糸を割り込ますことのない無突起物表面を基布の長さ方向に形成すれば、導電性突起物の先端にドアなどが当接しても、導電性突起物の接触密度が局所的に過密になるのを無突起物表面が阻止するので、導電性突起物の倒れなどの塑性変形を防止できる。 In addition, if a back coating layer is formed by applying a conductive paint to the base fabric so as to penetrate between the warp and weft of the base fabric and then drying, the base of the conductive protrusions is fixed to the base fabric by the back coating layer. Therefore, it becomes difficult for the conductive protrusions to fall off the base fabric.
In addition, if a non-projection surface that does not interrupt the conductive pile yarn is formed in the length direction of the base fabric at least a part of the widthwise central portion, right side portion, and left side portion of the belt-like base fabric, Even if a door or the like comes into contact with the tip of an object, the non-projection surface prevents the contact density of the conductive protrusions from becoming locally overcrowded, so that plastic deformation such as the collapse of the conductive protrusion can be prevented. .

次に本発明の第１の実施の形態を図面に基づいて説明する。
図１及び図２に示すように、電磁波シールド材１０は、導電性枠部材の表面に配設されるシート材１２と、シート材１２の表面に立設された導電性繊維によって形成される導電性突起物１３と、導電性突起物１３と導電性枠部材とを電気的に接続する接続部材１４とを備える。シート材１２は、たて糸１２ａとよこ糸を織り上げて作られ、たて方向を長さ方向とする帯状の基布である。この基布１２は合成繊維織布（例えば、ポリエステル，アクリル，ガラス繊維等）や綿織布などで形成され、基布１２に導電性を付与する必要は特にはない。 Next, a first embodiment of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the electromagnetic shielding material 10 is a conductive material formed by a sheet material 12 disposed on the surface of the conductive frame member and conductive fibers erected on the surface of the sheet material 12. The conductive protrusion 13 and the connection member 14 that electrically connects the conductive protrusion 13 and the conductive frame member are provided. The sheet material 12 is a belt-like base fabric that is made by weaving warp yarns 12a and weft yarns, with the warp direction as the length direction. The base fabric 12 is formed of a synthetic fiber woven fabric (for example, polyester, acrylic, glass fiber, etc.), a cotton woven fabric, or the like, and it is not particularly necessary to impart conductivity to the base fabric 12.

また導電性突起物１３は、図３に示すように、基布１２のたて方向に複数本の導電性パイル糸１６を割り込ませて織り上げて、パイル糸１６をカットすることにより基布１２の表面に突出して形成される。この基布１２と突起物１３は織物組織上、ベルベット又はビロードと呼ばれる。これにより導電性突起物１３は、基布１２の表面から離れるに従って側方に広がる。上記導電性突起物１３を形成する導電性繊維としては、合成繊維（例えば、ポリアミド，アクリル，アラミド，ポリエチレンテレフタレート，ポリウレタン，ポリプロピレン等）の表面に、銀，ニッケル，銅等の導電性めっきを施したものや、上記合成繊維に炭素繊維等の導電性材料を混入したものを用いることができる。   Further, as shown in FIG. 3, the conductive protrusions 13 are formed by interrupting and weaving a plurality of conductive pile yarns 16 in the warp direction of the base fabric 12, and cutting the pile yarns 16. Protrusively formed on the surface. The base fabric 12 and the protrusion 13 are called velvet or velvet in terms of the fabric structure. Thereby, the conductive protrusion 13 spreads laterally as the distance from the surface of the base fabric 12 increases. As the conductive fibers forming the conductive protrusions 13, conductive plating of silver, nickel, copper or the like is performed on the surface of a synthetic fiber (for example, polyamide, acrylic, aramid, polyethylene terephthalate, polyurethane, polypropylene, etc.). And those obtained by mixing a conductive material such as carbon fiber into the synthetic fiber can be used.

また基布１２の基部には、この基布１２のたて糸１２ａ及びよこ糸間に浸透するように導電性塗料を塗布して乾燥することにより、バックコーティング層１７が形成される。上記導電性塗料としては、銀、銅、導電性カーボンブラック、ニッケル、銅、銀等の導電性粉末を混合したアクリル、ビニル、エポキシ、アルキド等の塗料を用いることが好ましい。導電性粉末の平均粒径は０．５〜１０μｍであることが好ましい。
更に帯状の基布１２の全幅をｗ（ｍｍ）とし、突起物１３の基布１２表面からの高さをｈ（ｍｍ）とするとき、次の式（１）を満たすことが好ましい。
３／２５≦ｈ／ｗ≦２５／２５ … （１）
上記のようにｈ／ｗを３／２５≦ｈ／ｗ≦２５／２５の範囲に限定したのは、この範囲外では電磁波の遮蔽効果に劣るためである。なお、ｈ／ｗを６／２５≦ｈ／ｗ≦１２／２５の範囲に設定すると更に好ましい。 A back coating layer 17 is formed on the base portion of the base fabric 12 by applying a conductive paint so as to penetrate between the warp yarn 12a and the weft yarn of the base fabric 12 and drying. As the conductive paint, it is preferable to use a paint such as acrylic, vinyl, epoxy, alkyd mixed with conductive powder such as silver, copper, conductive carbon black, nickel, copper and silver. The average particle size of the conductive powder is preferably 0.5 to 10 μm.
Furthermore, when the total width of the belt-like base fabric 12 is w (mm) and the height of the protrusion 13 from the surface of the base fabric 12 is h (mm), it is preferable to satisfy the following formula (1).
3/25 ≦ h / w ≦ 25/25 (1)
The reason why h / w is limited to the range of 3/25 ≦ h / w ≦ 25/25 as described above is because the shielding effect of electromagnetic waves is inferior outside this range. It is more preferable that h / w is set in a range of 6/25 ≦ h / w ≦ 12/25.

一方、接続部材１４は、基布１２の裏面に導電性接着剤を塗布することにより形成された第１導電性接着剤層２１と、基布１２に第１導電性接着剤層２１を介して接着された導電性金属箔２３と、この金属箔２３の裏面に導電性接着剤を塗布することにより形成された第２導電性接着剤層２２とにより構成される。上記導電性接着剤としては、ニッケル、導電性カーボンブラック、ニッケル、銅、銀等の導電性粉末を混合したアクリル樹脂、合成ゴム系等の接着剤を用いることが好ましい。導電性粉末の平均粒径は０．５〜１０μｍであることが好ましい。また導電性金属箔２３としては、銅箔、アルミ箔、導電性プラスチックシートなどを用いることができ、その表面抵抗は１×１０-1Ω以下であることが望ましい。 On the other hand, the connecting member 14 includes a first conductive adhesive layer 21 formed by applying a conductive adhesive to the back surface of the base fabric 12, and the base fabric 12 via the first conductive adhesive layer 21. It is comprised by the electroconductive metal foil 23 adhere | attached, and the 2nd electroconductive adhesive layer 22 formed by apply | coating an electroconductive adhesive to the back surface of this metal foil 23. FIG. As the conductive adhesive, it is preferable to use an acrylic resin, synthetic rubber-based adhesive or the like in which conductive powders such as nickel, conductive carbon black, nickel, copper, and silver are mixed. The average particle size of the conductive powder is preferably 0.5 to 10 μm. As the conductive metal foil 23, a copper foil, an aluminum foil, a conductive plastic sheet or the like can be used, and the surface resistance is desirably 1 × 10 −1 Ω or less.

なお、図１及び図２の符号２４は第２導電性接着剤層２２の裏面に剥離可能に接着された離型紙である。また導電性金属箔２３の厚さは５０〜３００μｍ、好ましくは７０〜２００μｍの範囲に設定される。導電性金属箔２３の厚さを５０〜３００μｍの範囲に限定したのは、５０μｍ未満では箔強度が弱くなり過ぎ、３００μｍを越えると、コスト増となるためである。   Reference numeral 24 in FIGS. 1 and 2 denotes a release paper that is releasably adhered to the back surface of the second conductive adhesive layer 22. The thickness of the conductive metal foil 23 is set in the range of 50 to 300 μm, preferably 70 to 200 μm. The reason why the thickness of the conductive metal foil 23 is limited to the range of 50 to 300 μm is that if the thickness is less than 50 μm, the foil strength becomes too weak, and if it exceeds 300 μm, the cost increases.

このように構成された電磁波シールド材１０では、図１に示すように、基布１２に浸透するようにバックコーティング層１７を形成し、かつ基布１２の裏面に第１導電性接着剤層２１を形成したので、基布に織り上げられた導電性突起物の基部がバックコーティング層により固定され、基布１２の裏面に突出した導電性突起物１３の基部が第１導電性接着剤層２１により固定される。この結果、導電性突起物１３が基布１２から脱落することはない。
また第１及び第２導電性接着剤層２１，２２の間に導電率の高い導電性金属箔２３を介装したので、第１及び第２導電性接着剤層２１，２２の導電率が比較的低くても、導電性突起物１３で反射されずに導電性突起物１３に吸収された電磁波は、上記導電性突起物１３や、この突起物１３に電気的に接続された導電性金属箔２３及び導電性枠部材６３等における内部ロスで消滅するか、或いはこれらの表面で反射して戻る。この結果、電磁波をシールドする機能を確実に発揮できる。 In the electromagnetic wave shielding material 10 configured in this way, as shown in FIG. 1, the back coating layer 17 is formed so as to penetrate the base fabric 12, and the first conductive adhesive layer 21 is formed on the back surface of the base fabric 12. Therefore, the base portion of the conductive protrusion woven on the base fabric is fixed by the back coating layer, and the base portion of the conductive protrusion 13 protruding on the back surface of the base fabric 12 is fixed by the first conductive adhesive layer 21. Fixed. As a result, the conductive protrusion 13 does not fall off the base fabric 12.
In addition, since the conductive metal foil 23 having high conductivity is interposed between the first and second conductive adhesive layers 21 and 22, the conductivity of the first and second conductive adhesive layers 21 and 22 is compared. The electromagnetic wave absorbed by the conductive protrusion 13 without being reflected by the conductive protrusion 13 is low, but the conductive protrusion 13 and the conductive metal foil electrically connected to the protrusion 13 are not reflected. 23 disappears due to internal loss in the conductive frame member 63, the conductive frame member 63, or the like, or is reflected by these surfaces. As a result, the function of shielding electromagnetic waves can be reliably exhibited.

図４及び図５は本発明の第２の実施の形態を示す。図４及び図５において図１及び図２と同一符号は同一部品を示す。
この実施の形態では、帯状の基布１２の幅方向中央部、右側部及び左側部に導電性パイル糸を割り込ますことのない第１〜第３無突起物表面４１〜４３が基布１２の長さ方向にそれぞれ形成される。 4 and 5 show a second embodiment of the present invention. 4 and 5, the same reference numerals as those in FIGS. 1 and 2 denote the same components.
In this embodiment, the first to third no-projection surfaces 41 to 43 that do not interrupt the conductive pile yarns in the width direction center portion, the right side portion, and the left side portion of the belt-like base fabric 12 are the base fabric 12. Each is formed in the length direction.

上記帯状の基布１２の全幅をｗ（ｍｍ）とし、幅方向中央部の第１無突起物表面４１の幅をｐ1（ｍｍ）とし、右側部の第２無突起物表面４２の幅をｐ2（ｍｍ）とし、左側部の第３無突起物表面４３の幅をｐ3（ｍｍ）するとき、次の式（２）を満たすように設定されることが好ましい。
５／２５≦（ｐ1＋ｐ2＋ｐ3）／ｗ≦１６／２５ … （２）
但し、式（２）においてｐ1＞０、ｐ2＞０、ｐ3＞０である。
上記のように（ｐ1＋ｐ2＋ｐ3）／ｗを５／２５≦（ｐ1＋ｐ2＋ｐ3）／ｗ≦１６／２５の範囲に限定したのは、５／２５未満では電磁波の遮蔽効果に劣るからであり、１６／２５を越えると繰返しの使用により導電性突起物１３がへたるからである。なお、（ｐ1＋ｐ2＋ｐ3）／ｗを５／２５≦（ｐ1＋ｐ2＋ｐ3）／ｗ≦１２／２５の範囲に設定すると更に好ましい。 The total width of the strip-shaped base fabric 12 is w (mm), the width of the first non-projection surface 41 at the center in the width direction is p 1 (mm), and the width of the second non-projection surface 42 at the right side is the width. When p 2 (mm) is set and the width of the third non-projection surface 43 on the left side is p 3 (mm), it is preferably set so as to satisfy the following expression (2).
5/25 ≦ (p 1 + p 2 + p 3 ) / w ≦ 16/25 (2)
However, in Formula (2), p 1 > 0, p 2 > 0, and p 3 > 0.
As described above, (p 1 + p 2 + p 3 ) / w is limited to the range of 5/25 ≦ (p 1 + p 2 + p 3 ) / w ≦ 16/25. This is because if the ratio exceeds 16/25, the conductive protrusions 13 will sag due to repeated use. It is more preferable that (p 1 + p 2 + p 3 ) / w is set in a range of 5/25 ≦ (p 1 + p 2 + p 3 ) / w ≦ 12/25.

また第１無突起物表面４１の幅ｐ1（ｍｍ）と第２無突起物表面４２の幅をｐ2（ｍｍ）と第３無突起物表面４３の幅ｐ3（ｍｍ）とが次の式（３）を満たすように設定指されることが好ましい。
４／１０≦（ｐ2＋ｐ3）／ｐ1≦３０／１０ … （３）
但し、式（３）においてｐ2＝ｐ3＞０、ｐ1＞０である。
上記のように（ｐ2＋ｐ3）／ｐ1を４／１０≦（ｐ2＋ｐ3）／ｐ1≦３０／１０の範囲に限定したのは、４／１０未満では電磁波の遮蔽効果に劣るからであり、３０／１０を越えると繰返しの使用により導電性突起物１３がへたるからである。なお、（ｐ2＋ｐ3）／ｐ1を６／１０≦（ｐ2＋ｐ3）／ｐ1≦２０／１０の範囲に設定すると更に好ましい。上記以外は第１の実施の形態と同一に構成される。 The width p 1 (mm) and the width of the second non-protrusion surface 42 p 2 (mm) and the width p 3 of the third non-protrusion surface 43 of the first continuously protrusion surface 41 (mm) and is next It is preferable to be pointed to satisfy the expression (3).
4/10 ≦ (p 2 + p 3 ) / p 1 ≦ 30/10 (3)
However, in Formula (3), p 2 = p 3 > 0 and p 1 > 0.
As described above, (p 2 + p 3 ) / p 1 is limited to the range of 4/10 ≦ (p 2 + p 3 ) / p 1 ≦ 30/10. This is because if the thickness exceeds 30/10, the conductive protrusions 13 will sag due to repeated use. It is more preferable that (p 2 + p 3 ) / p 1 is set in a range of 6/10 ≦ (p 2 + p 3 ) / p 1 ≦ 20/10. The configuration other than the above is the same as that of the first embodiment.

なお、この実施の形態では、帯状の基布の幅方向中央部、右側部及び左側部に第１〜第３無突起物表面を基布の長さ方向にそれぞれ形成したが、帯状の基布の幅方向中央部、右側部及び左側部のいずれか一部に無突起物表面を基布の長さ方向に形成してもよい。   In this embodiment, the first to third non-projected surfaces are respectively formed in the length direction of the base fabric at the width direction central portion, the right side portion, and the left side portion of the strip base fabric. A non-projection surface may be formed in the length direction of the base fabric at any one of the center portion, the right side portion, and the left side portion in the width direction.

このように構成された電磁波シールド材４０では、導電性突起物１３の先端にドアなどが当接しても、導電性突起物１３の接触密度が局所的に過密になるのを第１〜第３無突起物表面４１〜４３が阻止するので、導電性突起物１３の倒れなどの塑性変形を防止できる。この結果、電磁波シールド機能を第１の実施の形態より更に確実に発揮できる。上記以外の動作は第１の実施の形態の動作と略同様であるので、繰返しの説明を省略する。   In the electromagnetic wave shielding material 40 configured in this way, even if a door or the like comes into contact with the tip of the conductive protrusion 13, the contact density of the conductive protrusion 13 is locally overcrowded. Since the non-projection surfaces 41 to 43 block, plastic deformation such as the collapse of the conductive projection 13 can be prevented. As a result, the electromagnetic wave shielding function can be more reliably exhibited than in the first embodiment. Since the operation other than the above is substantially the same as the operation of the first embodiment, repeated description will be omitted.

なお、上記第１及び第２の実施の形態では、基布に浸透するようにバックコーティング層を形成し、かつ基布の裏面に第１導電性接着剤層を形成したが、基布１２にバックコーティング層を形成せずに第１導電性接着剤層のみを形成してもよい。この場合、第１導電性接着剤層は基布の裏面に突出した導電性突起物の基部のみならず、基布の裏面にも接触する。
また、上記第１及び第２の実施の形態の電磁波シールド材は、シールドルームの窓の周縁若しくは窓用扉の周縁に取付けたり、シールドルームの導電性網戸用窓枠の周縁若しくは導電性網戸の周縁に取付けたり、或いはシールドルームのロールスクリーン用窓枠の周縁に取付けることができる。 In the first and second embodiments, the back coating layer is formed so as to penetrate into the base fabric, and the first conductive adhesive layer is formed on the back surface of the base fabric. Only the first conductive adhesive layer may be formed without forming the back coating layer. In this case, the first conductive adhesive layer contacts not only the base of the conductive protrusion protruding on the back surface of the base fabric but also the back surface of the base fabric.
Moreover, the electromagnetic wave shielding material of the first and second embodiments is attached to the periphery of the window of the shield room or the periphery of the window door, or the periphery of the window frame for the conductive screen door of the shield room or the conductive screen door. It can be attached to the periphery or attached to the periphery of a roll screen window frame in a shield room.

次に本発明の実施例を比較例とともに詳しく説明する。
＜実施例１＞
図１及び図２に示すように、基布１２と、ポリエステル繊維からなる基布１２の表面に立設された導電性繊維（ポリエステル繊維にニッケルをコートした繊維）によって形成される導電性突起物１３と、導電性突起物３１と導電性枠部材とを電気的に接続する接続部材１４とを備えた電磁波シールド材１０を作製した。基布には導電性塗料を塗布し乾燥してバックコーティング層１７を形成した。導電性塗料としては、平均粒径が３μｍであるニッケル粉末を混合した導電性エマルジョン型塗料を用いた。 Next, examples of the present invention will be described in detail together with comparative examples.
<Example 1>
As shown in FIG.1 and FIG.2, the conductive protrusion formed by the base fabric 12 and the conductive fiber (fiber which coated the polyester fiber with nickel) standingly arranged on the surface of the base fabric 12 which consists of a polyester fiber. 13 and the electromagnetic shielding material 10 provided with the connection member 14 which electrically connects the electroconductive protrusion 31 and the electroconductive frame member were produced. A conductive coating was applied to the base fabric and dried to form a back coating layer 17. As the conductive paint, a conductive emulsion type paint mixed with nickel powder having an average particle diameter of 3 μm was used.

また上記接続部材１４は、基布１２の裏面に導電性接着剤を塗布することにより形成された第１導電性接着剤層２１と、基布１２に第１導電性接着剤層２１を介して接着された導電性金属箔２３と、この金属箔２３の裏面に導電性接着剤を塗布することにより形成された第２導電性接着剤層２２とにより構成した。導電性接着剤としては、平均粒径が２μｍである銅粉末を混合した導電性溶剤型接着剤を用いた。導電性金属箔２３としては、厚さ１００μｍの銅箔を用いた。この電磁波シールド材１０を実施例１とした。
＜比較例１＞
導電性金属箔を用いなかったことを除いて、実施例１と同様にして電磁波シールド材を作製した。この電磁波シールド材を比較例１とした。 The connecting member 14 includes a first conductive adhesive layer 21 formed by applying a conductive adhesive to the back surface of the base fabric 12, and the base fabric 12 via the first conductive adhesive layer 21. The conductive metal foil 23 was bonded, and the second conductive adhesive layer 22 was formed by applying a conductive adhesive to the back surface of the metal foil 23. As the conductive adhesive, a conductive solvent-type adhesive mixed with copper powder having an average particle diameter of 2 μm was used. As the conductive metal foil 23, a copper foil having a thickness of 100 μm was used. This electromagnetic wave shielding material 10 was taken as Example 1.
<Comparative Example 1>
An electromagnetic wave shielding material was produced in the same manner as in Example 1 except that the conductive metal foil was not used. This electromagnetic wave shielding material was referred to as Comparative Example 1.

＜比較試験１及び評価＞
縦×横×高さがそれぞれ４．５ｍ×６．５ｍ×２．４ｍであるシールドルームに、縦×横が９００ｍｍ×６００ｍｍの窓枠となる導電性枠部材を設け、この導電性枠部材の側縁に導電性を有する窓用扉をピンを介して枢着した。また窓用扉の閉止面の周縁に対向するように導電性枠部材に導電性フランジ部を設けた。更に窓用扉の閉止面の周縁に対向する導電性フランジ部に、実施例１及び比較例１の電磁波シールド材を順に第２導電性接着剤層を介して接着して次の測定を行った。 <Comparative test 1 and evaluation>
A conductive frame member serving as a window frame of 900 mm × 600 mm in length × width is provided in a shield room having length × width × height of 4.5 m × 6.5 m × 2.4 m, respectively. A conductive window door was pivotally attached to the side edge via a pin. Moreover, the conductive flange member was provided with a conductive flange portion so as to face the periphery of the closing surface of the window door. Further, the electromagnetic wave shielding materials of Example 1 and Comparative Example 1 were sequentially adhered to the conductive flange portion facing the periphery of the closing surface of the window door through the second conductive adhesive layer, and the following measurement was performed. .

具体的には、先ずシールドルーム内で発信器から所定の周波数の電磁波を放射し、窓用扉を開いて通孔を開放した状態で、シールドルーム外で１１０ｄＢμＶとなるように上記発信器の出力を調整した。次に窓用扉により通孔を閉止して、発信器から上記所定の電磁波を放射し、シールドルーム外に漏洩する電界強度を測定した。そして上記電界強度の差をシールド性能としてｄＢで表した。上記所定の周波数を２００ＭＨｚ、５００ＭＨｚ、８００ＭＨｚ及び１ＧＨｚと順次変えて測定した結果を表１に示す。   Specifically, first, an electromagnetic wave having a predetermined frequency is radiated from the transmitter in the shield room, and the output of the transmitter is set to 110 dBμV outside the shield room in a state where the window door is opened and the through hole is opened. Adjusted. Next, the through-hole was closed by the window door, and the electric field intensity that radiated the predetermined electromagnetic wave from the transmitter and leaked outside the shield room was measured. The difference in electric field strength was expressed as dB as the shielding performance. Table 1 shows the measurement results obtained by sequentially changing the predetermined frequency to 200 MHz, 500 MHz, 800 MHz, and 1 GHz.

＜比較試験２及び評価＞
上記と同一のシールドルームの導電性枠部材の上縁に導電性ロールスクリーンを繰出し可能に巻取った。またロールスクリーンの繰出し時にこのロールスクリーンの周縁を両面から挟むように一対の導電性フランジ部を導電性枠部材に設け、これらの導電性フランジ部の互いに対向する面に実施例１の電磁波シールド材を順に第２導電性接着剤層を介してそれぞれ接着して次の測定を行った。 <Comparative test 2 and evaluation>
A conductive roll screen was wound around the upper edge of the conductive frame member in the same shield room as described above so that it could be fed out. Also, a pair of conductive flange portions are provided on the conductive frame member so as to sandwich the periphery of the roll screen from both sides when the roll screen is extended, and the electromagnetic wave shielding material of Example 1 is formed on the surfaces of these conductive flange portions facing each other. Were sequentially bonded via the second conductive adhesive layer, and the following measurement was performed.

先ずシールドルーム内で発信器から所定の周波数の電磁波を放射し、ロールスクリーンを巻取って通孔を開放した状態で、シールドルーム外で１１０ｄＢμＶとなるように上記発信器の出力を調整した。次にロールスクリーンを繰出して通孔を閉止し、発信器から上記所定の周波数の電磁波を放射し、シールドルーム外に漏洩する電界強度を測定した。そして上記電界強度の差をシールド性能としてｄＢで表した。上記所定の周波数を２００ＭＨｚ、５００ＭＨｚ、８００ＭＨｚ及び１ＧＨｚと順次変えて測定した結果を表１に示す。   First, an electromagnetic wave having a predetermined frequency was radiated from the transmitter in the shield room, and the output of the transmitter was adjusted to 110 dBμV outside the shield room in a state where the roll screen was wound up and the through hole was opened. Next, the roll screen was extended to close the through hole, and the electromagnetic field having the predetermined frequency was emitted from the transmitter, and the electric field strength leaking out of the shield room was measured. The difference in electric field strength was expressed as dB as the shielding performance. Table 1 shows the measurement results obtained by sequentially changing the predetermined frequency to 200 MHz, 500 MHz, 800 MHz, and 1 GHz.

Figure 0004369472
表１から明らかなように、比較例１の窓用扉では、シールド性能が２３〜３８ｄＢと低かったのに対し、実施例１の窓用扉では、シールド性能が５０〜５５ｄＢと高くなった。また実施例１のロールスクリーンでは、シールド性能が６２〜７２ｄＢと実施例１の窓用扉より更に高くなった。
Figure 0004369472
 As is clear from Table 1, the shielding performance of the window door of Comparative Example 1 was as low as 23 to 38 dB, whereas the shielding performance of the window door of Example 1 was as high as 50 to 55 dB. In the roll screen of Example 1, the shielding performance was 62 to 72 dB, which was higher than that of the window door of Example 1.

本発明第１実施形態の電磁波シールド材を示す図２のＡ−Ａ線断面図である。It is the sectional view on the AA line of FIG. 2 which shows the electromagnetic wave shielding material of 1st Embodiment of this invention. その電磁波シールド材の要部斜視図である。It is a principal part perspective view of the electromagnetic wave shielding material. 導電性パイル糸をカットしている状態を示す説明図である。It is explanatory drawing which shows the state which has cut the conductive pile thread | yarn. 本発明の第２実施形態を示す図４のＢ−Ｂ線断面図である。It is the BB sectional view taken on the line of FIG. 4 which shows 2nd Embodiment of this invention. その電磁波シールド材の要部斜視図である。It is a principal part perspective view of the electromagnetic wave shielding material.

符号の説明Explanation of symbols

１０，４０ 電磁波シールド材
１２ 基布（シート材）
１２ａ たて糸
１３ 導電性突起物
１４ 接続部材
１６ 導電性パイル糸
１７ バックコーティング層
２１ 第１導電性接着剤層
２２ 第２導電性接着剤層
２３ 導電性金属箔
４１ 第１無突起物表面
４２ 第２無突起物表面
４３ 第３無突起物表面 10, 40 Electromagnetic wave shielding material 12 Base fabric (sheet material)
12a Warp yarn 13 Conductive protrusion 14 Connection member 16 Conductive pile yarn 17 Back coating layer 21 First conductive adhesive layer 22 Second conductive adhesive layer 23 Conductive metal foil 41 First non-projection surface 42 Second Non-projection surface 43 Third non-projection surface

Claims (6)

導電性枠部材の表面に配設されるシート材(12)と、前記シート材(12)の表面に立設された導電性繊維によって形成される導電性突起物(13)と、前記導電性突起物(13)と前記導電性枠部材とを電気的に接続する接続部材(14)とを備えた電磁波シールド材において、
前記シート材(12)が、たて糸(12a)とよこ糸を織り上げて作られたて方向を長さ方向とする帯状の基布であり、
前記導電性突起物(13)が、前記基布(12)のたて方向に複数本の導電性パイル糸(16)を割り込ませて織り上げて前記パイル糸(16)をカットすることにより前記基布(12)の表面に突出して形成され、
前記接続部材(14)が、前記基布(12)の裏面に導電性接着剤を塗布することにより形成された第１導電性接着剤層(21)と、前記基布(12)に前記第１導電性接着剤層(21)を介して接着された導電性金属箔(23)と、前記金属箔(23)の裏面に導電性接着剤を塗布することにより形成された第２導電性接着剤層(22)とにより構成された
ことを特徴とする電磁波シールド材。 Sheet material (12) disposed on the surface of the conductive frame member, conductive protrusions (13) formed by conductive fibers erected on the surface of the sheet material (12), and the conductive In the electromagnetic wave shielding material comprising a projection (13) and a connection member (14) for electrically connecting the conductive frame member,
The sheet material (12) is a belt-like base fabric whose length direction is the warp direction made by weaving warp yarns (12a) and weft yarns,
The conductive protrusion (13) cuts the pile yarn (16) by cutting and interposing a plurality of conductive pile yarns (16) in the warp direction of the base fabric (12). Formed to protrude on the surface of the cloth (12),
The connection member (14) includes a first conductive adhesive layer (21) formed by applying a conductive adhesive to the back surface of the base fabric (12), and the base fabric (12). 1 conductive metal foil (23) bonded through a conductive adhesive layer (21), and a second conductive adhesive formed by applying a conductive adhesive to the back surface of the metal foil (23). An electromagnetic wave shielding material comprising an agent layer (22). 基布(12)のたて糸(12a)及びよこ糸間に浸透するように導電性塗料を前記基布(12)に塗布して乾燥することによりバックコーティング層(17)が形成された請求項１記載の電磁波シールド材。   The back coating layer (17) is formed by applying a conductive paint to the base fabric (12) and drying so as to penetrate between the warp yarn (12a) and the weft yarn of the base fabric (12). Electromagnetic shielding material. 帯状の基布(12)の幅方向中央部、右側部及び左側部の少なくとも一部に導電性パイル糸を割り込ますことのない無突起物表面(41〜43)が前記基布(12)の長さ方向に形成された請求項１記載の電磁波シールド材。   The non-projection surface (41 to 43) that does not interrupt the conductive pile yarn in at least a part of the widthwise center portion, right side portion, and left side portion of the belt-like base fabric (12) is the base fabric (12). The electromagnetic shielding material according to claim 1, wherein the electromagnetic shielding material is formed in a length direction. 帯状の基布(12)の全幅をｗ(mm)とし、突起物(13)の基布(12)表面からの高さをｈ(mm)とするとき、次の式（１）を満たす請求項１又は３記載の電磁波シールド材。
３／２５≦ｈ／ｗ≦２５／２５ … （１） When the total width of the belt-like base fabric (12) is w (mm) and the height of the projection (13) from the surface of the base fabric (12) is h (mm), the following equation (1) is satisfied. Item 4. The electromagnetic shielding material according to Item 1 or 3.
3/25 ≦ h / w ≦ 25/25 (1) 帯状の基布(12)の全幅をｗ(mm)とし、幅方向中央部の無突起物表面(41)の幅をｐ1(mm)とし、右側部の無突起物表面(42)の幅をｐ2(mm)とし、左側部の無突起物表面(43)の幅をｐ3(mm)するとき、次の式（２）を満たす請求項３記載の電磁波シールド材。
５／２５≦（ｐ1＋ｐ2＋ｐ3）／ｗ≦１６／２５ … （２）
但し、式（２）においてｐ1＞０、ｐ2＞０、ｐ3＞０である。 The total width of the strip-shaped base fabric (12) is w (mm), the width of the non-projection surface (41) at the center in the width direction is p 1 (mm), and the width of the non-projection surface (42) on the right side The electromagnetic wave shielding material according to claim 3, wherein p 2 (mm) and the width of the non-projection surface (43) on the left side is p 3 (mm), satisfying the following formula (2).
5/25 ≦ (p 1 + p 2 + p 3 ) / w ≦ 16/25 (2)
However, in Formula (2), p 1 > 0, p 2 > 0, and p 3 > 0. 幅方向中央部の無突起物表面(41)の幅ｐ1(mm)と右側部の無突起物表面(42)の幅をｐ2(mm)と左側部の無突起物表面(43)の幅ｐ3(mm)とが次の式（３）を満たす請求項５記載の電磁波シールド材。
４／１０≦（ｐ2＋ｐ3）／ｐ1≦３０／１０ … （３）
但し、式（３）においてｐ2＝ｐ3＞０、ｐ1＞０である。 The width p 1 (mm) of the protrusion-free surface (41) at the center in the width direction, the width of the protrusion-free surface (42) on the right side, p 2 (mm), and the protrusion-free surface (43) on the left side. The electromagnetic wave shielding material according to claim 5, wherein the width p 3 (mm) satisfies the following formula (3).
4/10 ≦ (p 2 + p 3 ) / p 1 ≦ 30/10 (3)
However, in Formula (3), p 2 = p 3 > 0 and p 1 > 0.
JP2006353547A 2002-07-16 2006-12-28 Electromagnetic shielding material Expired - Fee Related JP4369472B2 (en)

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