JPH1093281A - Gasket for shielding electromagnetic wave - Google Patents
Gasket for shielding electromagnetic waveInfo
- Publication number
- JPH1093281A JPH1093281A JP24197396A JP24197396A JPH1093281A JP H1093281 A JPH1093281 A JP H1093281A JP 24197396 A JP24197396 A JP 24197396A JP 24197396 A JP24197396 A JP 24197396A JP H1093281 A JPH1093281 A JP H1093281A
- Authority
- JP
- Japan
- Prior art keywords
- gasket
- sponge
- electromagnetic wave
- core material
- electromagnetic waves
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000126 substance Substances 0.000 claims abstract description 17
- 239000011162 core material Substances 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 7
- 239000006247 magnetic powder Substances 0.000 claims abstract description 6
- 238000005187 foaming Methods 0.000 claims abstract description 5
- 238000010097 foam moulding Methods 0.000 claims abstract 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 5
- 229920003002 synthetic resin Polymers 0.000 claims description 4
- 239000000057 synthetic resin Substances 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 239000004744 fabric Substances 0.000 abstract description 6
- 230000000903 blocking effect Effects 0.000 abstract 2
- 239000006260 foam Substances 0.000 abstract 1
- 230000002452 interceptive effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- YACLQRRMGMJLJV-UHFFFAOYSA-N chloroprene Chemical compound ClC(=C)C=C YACLQRRMGMJLJV-UHFFFAOYSA-N 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 239000006261 foam material Substances 0.000 description 1
- 239000006249 magnetic particle Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Landscapes
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は電磁波シールド用ガ
スケット、特に、電子機器の筐体の隙間から漏洩せんと
する妨害電磁波を抑制する電磁波シールド用ガスケット
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gasket for shielding electromagnetic waves, and more particularly, to a gasket for shielding electromagnetic waves which suppresses an electromagnetic wave leaking from a gap in a housing of an electronic device.
【０００２】[0002]
【従来の技術】近年、電子機器の急速な普及に伴ない、
これらの機器から漏洩する妨害電磁波が、他の機器へ影
響を与えてしまう電磁波障害（ＥＭＩ）が世界的な問題
になっている。ＥＭＩを防止する手段として、電磁波シ
ールド用ガスケットを使用して、筐体とパネル間あるい
は筐体と基板間等に接触させて電位差を無くすことによ
り、妨害電磁波発生を抑制している。2. Description of the Related Art In recent years, with the rapid spread of electronic devices,
Electromagnetic interference (EMI), in which electromagnetic waves leaking from these devices affect other devices, has become a worldwide problem. As means for preventing EMI, the generation of interfering electromagnetic waves is suppressed by using a gasket for shielding electromagnetic waves and contacting between a housing and a panel or between a housing and a substrate to eliminate a potential difference.
【０００３】従来の電磁波シールド用ガスケットについ
て図面を参照して詳細に説明する。[0003] A conventional electromagnetic shielding gasket will be described in detail with reference to the drawings.
【０００４】図４は従来の一例を示す断面図である。図
４に示す電磁波シールド用ガスケットは、スポンジ２
と、スポンジ２の周囲に覆設されたシート状の導電性布
３とを含んで構成される。（例えば、特開平６−３５０
２８２号公報参照）FIG. 4 is a sectional view showing an example of the prior art. The electromagnetic shielding gasket shown in FIG.
And a sheet-like conductive cloth 3 covered around the sponge 2. (For example, see JP-A-6-350
No. 282)
【発明が解決しようとする課題】上述した従来の電磁波
シールド用ガスケットは、筐体とパネル間などの隙間を
完全に塞ぐことがでにない場合があるため、漏洩電磁波
を十分に抑制できず、また、可撓性を要求されるので導
電性布の厚さを増加できず、その故、電磁波の減衰率が
悪いという欠点があった。In the above-mentioned conventional gasket for electromagnetic wave shielding, since the gap between the housing and the panel cannot be completely closed in some cases, the leakage electromagnetic wave cannot be sufficiently suppressed. In addition, there is a drawback that the thickness of the conductive cloth cannot be increased due to the required flexibility, and thus the attenuation rate of electromagnetic waves is poor.
【０００５】[0005]
【課題を解決するための手段】第１の発明の電磁波シー
ルド用ガスケットは、スポンジ状の芯材と、前記スポン
ジ状の芯材の内部に挿入した磁性物質と、前記スポンジ
状の芯材の周囲に覆設されたシート状の導電性シートと
を含んで構成される。According to a first aspect of the present invention, there is provided a gasket for shielding electromagnetic waves, comprising a sponge-shaped core material, a magnetic substance inserted inside the sponge-shaped core material, and a periphery of the sponge-shaped core material. And a sheet-shaped conductive sheet that is covered.
【０００６】第２の発明の電磁波シールド用ガスケット
は、第１の発明において、前記磁性物質が板状である。According to a second aspect of the present invention, there is provided a gasket for shielding electromagnetic waves according to the first aspect, wherein the magnetic substance has a plate shape.
【０００７】第３の発明の電磁波シールド用ガスケット
は、第１の発明において、前記磁性物質が粒状である。According to a third aspect of the present invention, there is provided a gasket for electromagnetic wave shielding according to the first aspect, wherein the magnetic substance is granular.
【０００８】第４の発明の電磁波シールド用ガスケット
は、第１の発明において、前記スポンジ状の芯材が合成
樹脂の発泡材と導電性粉末とを混合した後、発泡成形し
たものである。According to a fourth aspect of the present invention, there is provided a gasket for shielding electromagnetic waves according to the first aspect, wherein the sponge-shaped core material is formed by mixing a foamed material of a synthetic resin and a conductive powder and then foaming.
【０００９】第５の発明の電磁波シールド用ガスケット
は、第４の発明において、前記導電性粉末としてカーボ
ンを用いる。In a fifth aspect of the present invention, in the gasket for shielding electromagnetic waves according to the fourth aspect, carbon is used as the conductive powder.
【００１０】第６の発明の電磁波シールド用ガスケット
は、第１の発明において、前記スポンジ状の芯材が合成
樹脂の発泡材と磁性粉末とを混合した後、発泡成形した
ものである。In a sixth aspect of the present invention, in the gasket for an electromagnetic wave shield according to the first aspect, the sponge-shaped core material is formed by mixing a foamed material of a synthetic resin and a magnetic powder and then foaming the mixture.
【００１１】第７の発明の電磁波シールド用ガスケット
は、第６の発明において、前記磁性粉末として酸化鉄を
用いる。In a seventh aspect of the present invention, in the gasket for shielding electromagnetic waves according to the sixth aspect, iron oxide is used as the magnetic powder.
【００１２】[0012]
【発明の実施の形態】次に、本発明について図面を参照
して詳細に説明する。Next, the present invention will be described in detail with reference to the drawings.
【００１３】図１（ａ），（ｂ）は本発明の第１の実施
形態を示す斜視図および断面図である。図１（ａ），
（ｂ）に示す電磁波シールド用ガスケットは、スポンジ
２と、スポンジ２の内部に挿入した板状の磁性物質１
と、スポンジ２の周囲に覆設されたシート状の導電性布
３とを含んで構成される。FIGS. 1A and 1B are a perspective view and a sectional view, respectively, showing a first embodiment of the present invention. FIG. 1 (a),
The gasket for electromagnetic wave shielding shown in (b) includes a sponge 2 and a plate-like magnetic substance 1 inserted inside the sponge 2.
And a sheet-like conductive cloth 3 covered around the sponge 2.
【００１４】図２は本発明の第２の実施形態を示す断面
図である。図２に示す電磁波シールド用ガスケットは、
スポンジ２と、スポンジ２の内部に挿入した粒状の磁性
物質４ａ，４ｂ，・・・４ｎと、スポンジ２の周囲に覆
設されたシート状の導電性布３とを含んで構成される。
磁性物質４ａ，４ｂ，・・・４ｎの粒径は、意識的にバ
ラツキを持たせているが、同一であってもよい。FIG. 2 is a sectional view showing a second embodiment of the present invention. The gasket for electromagnetic wave shielding shown in FIG.
The sponge 2 includes granular magnetic substances 4 a, 4 b,... 4 n inserted into the sponge 2, and a sheet-like conductive cloth 3 covered around the sponge 2.
The magnetic particles 4a, 4b,... 4n have intentionally varied particle sizes, but may be the same.
【００１５】図３は本発明の一使用例を示す断面図であ
る。筐体５と筐体６との隙間に挟み込むように図１に示
す電磁波シールド用ガスケットを取り付けることによ
り、筐体５と筐体６との間の電位差を減少させ、さらに
磁性物質の磁気特性により、筐体５と筐体６との隙間か
ら漏洩しようとする妨害電磁波を抑制する。磁性物質
は、妨害電磁波の漏洩方向を変化させるので、妨害電磁
波が筐体の隙間から漏洩しにくくなる。FIG. 3 is a sectional view showing an example of use of the present invention. By mounting the electromagnetic wave shielding gasket shown in FIG. 1 so as to be sandwiched in the gap between the housing 5 and the housing 6, the potential difference between the housing 5 and the housing 6 is reduced, and the magnetic property of the magnetic substance is further reduced. In addition, it suppresses an interfering electromagnetic wave that leaks from a gap between the housing 5 and the housing 6. The magnetic substance changes the direction of leakage of the interfering electromagnetic waves, so that the interfering electromagnetic waves are less likely to leak from gaps in the housing.
【００１６】本発明のスポンジは、クロロプレインやポ
リウレタン等の弾力性のある発泡材を所要の形状に成形
したものである。また発泡材にカーボン粉末等の導電性
物質あるいは、酸化鉄（フエライト）等の磁性粉末等を
混入させた後、発泡成形させたものを用いると、さらに
電磁波の減衰特性が向上する。これは、ポリウレタン等
の微小中空球の表面に導電（または磁性）粉末等が付着
したものの集合体であるから、軽量で筐体の形状に容易
に順応する柔軟性があり、導電布の薄さを補う役目を果
す。The sponge of the present invention is formed by molding an elastic foam material such as chloroprene or polyurethane into a required shape. When a foamed material is mixed with a conductive material such as carbon powder or a magnetic powder such as iron oxide (ferrite) and then foamed, the electromagnetic wave attenuation characteristics are further improved. Since this is an aggregate of fine hollow spheres made of polyurethane or the like with conductive (or magnetic) powder attached to the surface, it is lightweight and has the flexibility to easily adapt to the shape of the housing. Serves as a supplement to
【００１７】[0017]
【発明の効果】本発明の電磁波シールド用ガスケット
は、磁性物質を追加したので、妨害電磁波に対する減衰
作用が増加するという効果がある。The gasket for shielding electromagnetic waves according to the present invention has the effect of increasing the damping effect on interfering electromagnetic waves since a magnetic substance is added.
【図１】（ａ），（ｂ）は本発明の第１の実施形態を示
す斜視図および断面図である。FIGS. 1 (a) and 1 (b) are a perspective view and a sectional view showing a first embodiment of the present invention.
【図２】本発明の第２の実施形態を示す断面図である。FIG. 2 is a sectional view showing a second embodiment of the present invention.
【図３】本発明の一使用例を示す断面図である。FIG. 3 is a sectional view showing an example of use of the present invention.
【図４】従来の一例を示す断面図である。FIG. 4 is a cross-sectional view showing an example of the related art.
１ 磁性物質 ２ スポンジ ３ 導電性布 ４ 磁性物質 ５ 筐体 ６ 筐体 DESCRIPTION OF SYMBOLS 1 Magnetic substance 2 Sponge 3 Conductive cloth 4 Magnetic substance 5 Case 6 Case
Claims (7)
芯材の内部に挿入した磁性物質と、前記スポンジ状の芯
材の周囲に覆設されたシート状の導電性シートとを含む
ことを特徴とする電磁波シールド用ガスケット。1. A sponge-shaped core material, a magnetic substance inserted into the sponge-shaped core material, and a sheet-shaped conductive sheet covered around the sponge-shaped core material. A gasket for electromagnetic wave shielding characterized by the following.
の電磁波シールド用ガスケット。2. The gasket for electromagnetic wave shielding according to claim 1, wherein said magnetic substance is in a plate shape.
の電磁波シールド用ガスケット。3. The gasket for an electromagnetic wave shield according to claim 1, wherein said magnetic substance is granular.
材と導電性粉末とを混合した後、発泡成形したものであ
る請求項１記載の電磁波シールド用ガスケット。4. The gasket for electromagnetic wave shielding according to claim 1, wherein the sponge-shaped core material is formed by mixing a foamed material of a synthetic resin and a conductive powder and then foaming the mixture.
請求項４記載の電磁波シールド用ガスケット。5. The gasket for electromagnetic wave shielding according to claim 4, wherein carbon is used as said conductive powder.
材と磁性粉末とを混合した後、発泡成形したものである
請求項１記載の電磁波シールド用ガスケット。6. The electromagnetic wave shielding gasket according to claim 1, wherein the sponge-shaped core material is formed by mixing a foamed material of a synthetic resin and a magnetic powder and then foam-molding the mixture.
項６記載の電磁波シールド用ガスケット。7. The gasket for electromagnetic wave shielding according to claim 6, wherein iron oxide is used as said magnetic powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24197396A JP2842856B2 (en) | 1996-09-12 | 1996-09-12 | Gasket for electromagnetic wave shielding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24197396A JP2842856B2 (en) | 1996-09-12 | 1996-09-12 | Gasket for electromagnetic wave shielding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1093281A true JPH1093281A (en) | 1998-04-10 |
| JP2842856B2 JP2842856B2 (en) | 1999-01-06 |
Family
ID=17082351
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24197396A Expired - Fee Related JP2842856B2 (en) | 1996-09-12 | 1996-09-12 | Gasket for electromagnetic wave shielding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2842856B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100590782B1 (en) * | 2003-12-23 | 2006-06-19 | 조인셋 주식회사 | Conductive Gasket and Manufacturing Method Thereof |
| KR100740175B1 (en) | 2003-11-03 | 2007-07-16 | 주식회사 이송이엠씨 | Electromagnetic shielding and absorption gasket and its manufacturing method |
| JP2007288233A (en) * | 2006-04-12 | 2007-11-01 | Audio Technica Corp | Condenser microphone |
| JP2012243914A (en) * | 2011-05-18 | 2012-12-10 | Foam Kasei:Kk | Electromagnetic wave shield gasket, and electromagnetic wave shield structure |
| JP2013161904A (en) * | 2012-02-03 | 2013-08-19 | Nok Corp | Electromagnetic wave shield gasket and manufacturing method therefor |
-
1996
- 1996-09-12 JP JP24197396A patent/JP2842856B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100740175B1 (en) | 2003-11-03 | 2007-07-16 | 주식회사 이송이엠씨 | Electromagnetic shielding and absorption gasket and its manufacturing method |
| KR100590782B1 (en) * | 2003-12-23 | 2006-06-19 | 조인셋 주식회사 | Conductive Gasket and Manufacturing Method Thereof |
| JP2007288233A (en) * | 2006-04-12 | 2007-11-01 | Audio Technica Corp | Condenser microphone |
| JP2012243914A (en) * | 2011-05-18 | 2012-12-10 | Foam Kasei:Kk | Electromagnetic wave shield gasket, and electromagnetic wave shield structure |
| JP2013161904A (en) * | 2012-02-03 | 2013-08-19 | Nok Corp | Electromagnetic wave shield gasket and manufacturing method therefor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2842856B2 (en) | 1999-01-06 |
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