JP2002076668A - Electromagnetic wave suppressing sheet - Google Patents
Electromagnetic wave suppressing sheetInfo
- Publication number
- JP2002076668A JP2002076668A JP2000256830A JP2000256830A JP2002076668A JP 2002076668 A JP2002076668 A JP 2002076668A JP 2000256830 A JP2000256830 A JP 2000256830A JP 2000256830 A JP2000256830 A JP 2000256830A JP 2002076668 A JP2002076668 A JP 2002076668A
- Authority
- JP
- Japan
- Prior art keywords
- electromagnetic wave
- sheet
- alloy powder
- wave suppressing
- weight
- 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.)
- Pending
Links
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、電子機器から発生
する不要電磁波を抑制し、電磁波による弊害を防ぐ事を
目的としたシート状の電磁波抑制体に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet-like electromagnetic wave suppressor for suppressing unnecessary electromagnetic waves generated from an electronic device and preventing adverse effects due to the electromagnetic waves.
【０００２】[0002]
【従来の技術】電子機器より発生した不要の電磁波は、
その機器内部において相互干渉を起こし、又、外部から
到来した電磁波からも影響を受けている。これ等の障害
を防ぎ、又電子機器から発生した電磁波を遮蔽して、外
部に放出されない様にする為、従来よりフェライト粉
末、或いは軟磁性金属粉を樹脂に分散させて、電磁波を
抑制する方法はとられていた。しかし、電磁波を吸収、
抑制する効果は、その抑制体の厚さに依存する所が大き
く、薄い物（特に１ｍｍ以下の厚さ）では、十分な効果
が得られていなかった。2. Description of the Related Art Unwanted electromagnetic waves generated by electronic devices are:
Mutual interference occurs inside the device, and the device is also affected by electromagnetic waves arriving from outside. In order to prevent such obstacles and shield electromagnetic waves generated from electronic equipment so that they are not emitted outside, a method of suppressing electromagnetic waves by dispersing ferrite powder or soft magnetic metal powder in resin conventionally. Had been taken. However, absorbing electromagnetic waves,
The effect of suppression largely depends on the thickness of the suppressor, and a thin material (particularly, a thickness of 1 mm or less) has not been able to obtain a sufficient effect.
【０００３】[0003]
【発明が解決しようとする課題】昨今の電子機器の小型
化、軽量化、及び弊害の拡大が進むにつれ、更に薄い電
磁波抑制体が求められ、より吸収量が大きく、遮蔽効果
の高い物が必要となっている。これ等の要求に応え得る
電磁波抑制体の提供を行う。As electronic devices have become smaller, lighter, and more harmful, the need for thinner electromagnetic wave suppressors has increased. It has become. An electromagnetic wave suppressor capable of meeting these requirements is provided.
【０００４】[0004]
【課題を解決するための手段】Ｎｉ−Ｆｅ合金粉を樹脂
素材に分散、混合させて、それをシート状に作成した電
磁波抑制体とする。又、このＮｉ−Ｆｅ合金粉は、鱗片
状とする。さらに、樹脂素材とＮｉ−Ｆｅ合金粉の混合
比率は、樹脂重量１００％に対して、Ｎｉ−Ｆｅ合金粉
は２００％以上とする。又、Ｎｉ−Ｆｅ合金にＭｏ，Ｃ
ｒ，Ｍｎの内より少なくとも一種以上の金属を５重量％
以下添加している事を特徴とする。Means for Solving the Problems A Ni-Fe alloy powder is dispersed and mixed in a resin material to obtain a sheet-like electromagnetic wave suppressor. The Ni-Fe alloy powder is in the form of scale. Further, the mixing ratio of the resin material and the Ni-Fe alloy powder is set to 200% or more for the Ni-Fe alloy powder with respect to the resin weight of 100%. In addition, Mo, C is added to Ni-Fe alloy.
5% by weight of at least one metal from r and Mn
It is characterized by being added below.
【０００５】[0005]
【発明の実施の形態】各種のフェライト粉末及びＦｅ−
Ｓｉ素合金，Ｆｅ−Ｃｏ素合金，カーボニール鉄，その
他の軟磁性合金粉を準備した。又、樹脂として、シリコ
ンゴム，エチレン−プロピレンゴムを準備した。これ等
を計画した混合比に基づき、計量をした後、混錬機に依
り、分散混合を行った。これを一般的なゴムの製造方法
であるホットプレスにより１ｍｍ〜０．１ｍｍのシート
を作成した。こうして作成したそれぞれのシートを電磁
波抑制体として、必要な諸特性を測定した。その結果、
Ｎｉ−Ｆｅ合金の鱗片状粉体を分散混合して作成した電
磁波抑制体が、他のフェライト及び軟磁性合金粉を分散
混合して作成されたシートに比べて、電磁波抑制体とし
ての特性が極めて優れている事を見出した。更に、この
Ｎｉ−Ｆｅ合金粉（鱗片状）の詳細を検討する作業を進
め、樹脂素材とＮｉ−Ｆｅ合金粉（鱗片状）の混合比率
は、樹脂重量１００％に対して、Ｎｉ−Ｆｅ合金粉（鱗
片状）は重量２００％以上とした時、電磁波吸収特性、
電磁波遮蔽特性が大きく向上する事を確認した。又、こ
のＮｉ−ＦｅにＭｏ，Ｃｒ，Ｍｎ等の金属を微量添加す
る事により、特性の再現性が向上する事を知った。DESCRIPTION OF THE PREFERRED EMBODIMENTS Various ferrite powders and Fe-
Si element alloys, Fe—Co element alloys, carbonyl iron, and other soft magnetic alloy powders were prepared. Silicon rubber and ethylene-propylene rubber were prepared as resins. These were measured based on the planned mixing ratio, and then dispersed and mixed by a kneader. A sheet having a thickness of 1 mm to 0.1 mm was formed by hot pressing, which is a general method for producing rubber. Various characteristics required were measured using each sheet thus prepared as an electromagnetic wave suppressor. as a result,
The electromagnetic wave suppressor made by dispersing and mixing the flaky powder of the Ni-Fe alloy has extremely high characteristics as an electromagnetic wave suppressor as compared with a sheet made by dispersing and mixing other ferrite and soft magnetic alloy powder. I found it to be excellent. Further, the work of examining the details of the Ni-Fe alloy powder (scale-like) was advanced, and the mixing ratio of the resin material and the Ni-Fe alloy powder (scale-like) was such that the Ni-Fe alloy When the powder (scale) has a weight of 200% or more, electromagnetic wave absorption characteristics,
It was confirmed that the electromagnetic wave shielding characteristics were greatly improved. In addition, it has been found that the reproducibility of characteristics is improved by adding a small amount of a metal such as Mo, Cr, or Mn to the Ni-Fe.
【０００６】[0006]
【発明の効果】本発明に依り作成された電磁波抑制シー
トは従来品に比べ極めて薄く（１ｍｍ〜０．１ｍｍの厚
さ）作成しても、大きな吸収効果、遮蔽効果を有し、電
子機器の小型化，軽量化，及び電磁波の弊害防止が可能
となる。According to the present invention, the electromagnetic wave suppressing sheet made according to the present invention has a large absorbing effect and a shielding effect even if it is made extremely thin (1 mm to 0.1 mm thick) as compared with a conventional product. It is possible to reduce the size and weight and prevent the adverse effects of electromagnetic waves.
Claims (4)
させて作成したシート状の電磁波抑制体。1. A sheet-like electromagnetic wave suppressor prepared by dispersing and mixing a Ni—Fe alloy powder in a resin material.
徴とする請求項１に記載した電磁波吸収体。2. The electromagnetic wave absorber according to claim 1, wherein the Ni—Fe alloy powder is in a scale shape.
１００％に対して、Ｎｉ−Ｆｅ合金粉重量２００％以上
である事を特徴とする請求項１に記載した電磁波吸収
体。3. The electromagnetic wave absorber according to claim 1, wherein the mixing ratio of the Ni—Fe alloy powder is at least 200% by weight of the Ni—Fe alloy powder with respect to 100% by weight of the resin.
少なくとも一種類以上の金属を５重量％以下添加してい
る事を特徴とする請求項１に記載した電磁波吸収体。4. Ni—Fe is selected from the group consisting of Mo, Cr, and Mn.
The electromagnetic wave absorber according to claim 1, wherein at least one kind of metal is added in an amount of 5% by weight or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000256830A JP2002076668A (en) | 2000-08-28 | 2000-08-28 | Electromagnetic wave suppressing sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000256830A JP2002076668A (en) | 2000-08-28 | 2000-08-28 | Electromagnetic wave suppressing sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002076668A true JP2002076668A (en) | 2002-03-15 |
Family
ID=18745377
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000256830A Pending JP2002076668A (en) | 2000-08-28 | 2000-08-28 | Electromagnetic wave suppressing sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002076668A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006339528A (en) * | 2005-06-03 | 2006-12-14 | Polymatech Co Ltd | Radio wave absorber and its manufacturing method |
-
2000
- 2000-08-28 JP JP2000256830A patent/JP2002076668A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006339528A (en) * | 2005-06-03 | 2006-12-14 | Polymatech Co Ltd | Radio wave absorber and its manufacturing method |
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