JPS60134500A - Electromagnetic wave shielding material - Google Patents
Electromagnetic wave shielding materialInfo
- Publication number
- JPS60134500A JPS60134500A JP58241849A JP24184983A JPS60134500A JP S60134500 A JPS60134500 A JP S60134500A JP 58241849 A JP58241849 A JP 58241849A JP 24184983 A JP24184983 A JP 24184983A JP S60134500 A JPS60134500 A JP S60134500A
- Authority
- JP
- Japan
- Prior art keywords
- electromagnetic shielding
- shielding material
- material according
- synthetic resin
- composite metal
- 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
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
［発明の技術分野］
本発明は、特に低周波数帯域における磁気シールド性の
改善された電磁波シールド材料に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an electromagnetic shielding material with improved magnetic shielding properties, particularly in a low frequency band.
［発明の技術的背景とその問題点１
近年、外部の妨害電波から電子回路を保護し、かつ発信
回路等から発生する不要な電波を外部に漏洩するのを防
止するために電子機器の筐体を電磁波シールド材料によ
り形成することが要請されている。[Technical background of the invention and its problems 1 In recent years, electronic equipment casings have been used to protect electronic circuits from external interference radio waves and to prevent unnecessary radio waves generated from transmitting circuits from leaking to the outside. It is required that the shield be made of an electromagnetic shielding material.
このような電磁波シールド材料としＣは、金属や導電性
合成樹脂があげられるが、前者の金属は優れた電磁波シ
ールド効果を右する反面、重く、高価で、しかも加工性
が悪い等の欠点があるため、導電性合成樹脂の使用が主
流となりつつある。Such electromagnetic shielding materials C include metals and conductive synthetic resins, but while the former metals have excellent electromagnetic shielding effects, they have drawbacks such as being heavy, expensive, and have poor workability. Therefore, the use of conductive synthetic resins is becoming mainstream.
合成樹脂に導電性を付与する方法としては、合成樹脂成
形後、導電性塗料の塗布、金属溶射あるいはめつき等に
より表面に導電層を形成する方法と、合成樹脂内部にカ
ーボンや金属粉末、金属繊維等の導電性充填材を添加す
る内部添加法がある。Methods of imparting conductivity to synthetic resin include forming a conductive layer on the surface by applying conductive paint, metal spraying, or plating after molding the synthetic resin, and adding carbon, metal powder, or metal There is an internal addition method in which conductive fillers such as fibers are added.
前者の合成樹脂表面に導電層を形成する方法番よ、工程
が増え゛Ｃ量産性に乏しく、また導電層が長時間の使用
により剥がれてしまうという欠点′があるため、後者の
内部添加法に期待が寄せられて０る。The former method, in which a conductive layer is formed on the surface of a synthetic resin, requires more steps, is not suitable for mass production, and has the disadvantage that the conductive layer peels off after long-term use. My expectations are zero.
しかしながら、従来からの内部添加法により導電性を付
与された合成樹脂材料においても、次のような改善すべ
き問題が残されている。However, even in synthetic resin materials imparted with electrical conductivity by the conventional internal addition method, the following problems remain to be improved.
すなわち、欧米の電磁波障害に対する規制で１よ、１Ｍ
Ｈｚ前後のラジオ周波数帯から’：１００Ｍｆ（ｚ帯付
近のテレビ周波数帯までの電磁波をシールドすることが
要求されているが、単なる導電性物質力＼らなる充填材
の添加だけではこのような広い範囲のすべての周波数帯
域にわたって十分な電磁波シールド効果を得ることは困
難である。In other words, the European and American regulations regarding electromagnetic interference are 1.
It is required to shield electromagnetic waves from the radio frequency band around Hz to the TV frequency band around 100Mf (Z band), but it is not possible to shield such a wide range by simply adding a filler consisting of conductive material force. It is difficult to obtain sufficient electromagnetic shielding effectiveness over all frequency bands in the range.
また、電磁波は電界波および磁界波から成り立っている
が、このうち磁界波と電界波を共に有効にシールドする
効果は、従来の材料では十分でなかった。Moreover, electromagnetic waves consist of electric field waves and magnetic field waves, and conventional materials have not been able to effectively shield both magnetic field waves and electric field waves.
［発明の目的］
本発明はこのような問題を解決するためになされたもの
で、高周波数帯域の電磁波シールド性能に加え低周波数
帯域の電磁波、特に磁界波のシールド性に優れた成分を
含み、広い周波数帯の全域にわたり良好な電磁波シール
ド効果を有する材料を提供することを目的とする。[Objective of the Invention] The present invention was made to solve such problems, and includes a component that has excellent shielding performance against electromagnetic waves in the low frequency band, especially magnetic field waves, in addition to the electromagnetic wave shielding performance in the high frequency band. The purpose of the present invention is to provide a material that has a good electromagnetic shielding effect over a wide frequency band.
［発明の概要］
すなわち本発明の電磁波シールド材料は、強磁性体と高
導電性金属とからなる多層構造の複合金属繊維を、合成
樹脂に混合し−Ｃなることを特徴としている。[Summary of the Invention] That is, the electromagnetic shielding material of the present invention is characterized in that -C is obtained by mixing a composite metal fiber with a multilayer structure consisting of a ferromagnetic material and a highly conductive metal into a synthetic resin.
本発明に使用する高い透磁率を有する強磁性体としては
、パーマロイ、フェライトおよびステンレス等があげら
れる。これらの強磁性体の中でもニッケルを含む高透磁
率合金、特に１０００以上の初期透磁率値を有するパー
マロイが適している。Examples of the ferromagnetic material having high magnetic permeability used in the present invention include permalloy, ferrite, and stainless steel. Among these ferromagnetic materials, high magnetic permeability alloys containing nickel, particularly permalloy having an initial magnetic permeability value of 1000 or more, are suitable.
また、高導電性金属としては、銅または銅合金等の使用
が望ましい。Further, as the highly conductive metal, it is desirable to use copper or a copper alloy.
本発明における多層構造の複合金属繊維としては、デュ
メット線のような前記強磁性体からなる芯線の外側に同
時押出、めつぎ、蒸着あるいは溶＼
融浸漬等の方法で高導電性金属を被覆した構造の金属繊
維および高導電性金属からなる芯線の外側に強磁性体を
前述の方法で被覆した構造の金属繊維のいずれも用いる
ことができ、また２層以上交互に積層した構造のものも
用いることができる。The composite metal fiber of the present invention has a multilayer structure in which the outer side of a core wire made of the above-mentioned ferromagnetic material, such as a dumet wire, is coated with a highly conductive metal by a method such as coextrusion, plating, vapor deposition, or melting/dipping. Either metal fibers with a structure or metal fibers with a structure in which a ferromagnetic material is coated on the outside of a core wire made of a highly conductive metal by the above-mentioned method can be used, and a structure in which two or more layers are alternately laminated can also be used. be able to.
また、アスペクト比の高いものほど大きな電磁波シール
ド効果を有するので、本発明における複合金属繊維とし
ては、細径のものを使用することが好ましい。好ましい
金属ｌＩｌ！１の外形は約１０〜２００μｍ１長さは、
約２〜１０ｍｍである。ざらに、これらの複合金属繊維
における強磁性体層と高導電性金属層との径方向の長さ
、すなわち被覆厚の比を調整することにより、電磁波シ
ールド性能を適当にコントロールすることが望ましい。Further, since the higher the aspect ratio, the greater the electromagnetic wave shielding effect, it is preferable to use a composite metal fiber with a small diameter as the composite metal fiber in the present invention. Preferred metal lIl! The outer diameter of 1 is approximately 10 to 200 μm, and the length of 1 is approximately 10 to 200 μm.
It is approximately 2 to 10 mm. In general, it is desirable to appropriately control the electromagnetic shielding performance by adjusting the radial length of the ferromagnetic layer and the highly conductive metal layer in these composite metal fibers, that is, the ratio of the coating thickness.
本発明においては、このような複合金属繊維をシールド
成分とし、これを熱可塑性合成樹脂のような成形用合成
樹脂と混合するが、混合割合は５〜５０重量％の範囲と
することが好ましい。In the present invention, such a composite metal fiber is used as a shielding component and mixed with a molding synthetic resin such as a thermoplastic synthetic resin, and the mixing ratio is preferably in the range of 5 to 50% by weight.
前記範囲′Ｃ混合した場合には、十分な電磁波シールド
性を有し、しかも強度の低下の少ない電磁波シールド材
料が得られる。When the above-mentioned range 'C is mixed, an electromagnetic shielding material having sufficient electromagnetic shielding properties and little decrease in strength can be obtained.
また、合成樹脂への添加混合は、適当な長さに切断した
複合金属繊維を合成樹脂とともに押出機等に直接投入し
行なってもよいが、まず多数の複合金属繊維を束ねたも
のの外側に熱可塑性合成樹脂を被覆して一体化し、これ
をペレット状に切断することによりシールド成分を含む
マスターペレットを製造し、このマスターペレットを用
いた混合方法によれば、適当な長さの複合金属繊維が合
成樹脂中に均一に分散され、一段と電磁波シールド効果
に優れた合成樹脂材料が得られる。Furthermore, when adding and mixing composite metal fibers to a synthetic resin, composite metal fibers cut into appropriate lengths may be directly fed into an extruder etc. together with the synthetic resin, but first heat is applied to the outside of a bundle of many composite metal fibers. A master pellet containing a shielding component is produced by coating and integrating a plastic synthetic resin and cutting it into pellets. According to a mixing method using this master pellet, composite metal fibers of an appropriate length can be produced. A synthetic resin material that is uniformly dispersed in a synthetic resin and has an even better electromagnetic shielding effect can be obtained.
マスターペレッ［へにする場合の金属繊維と合成樹脂の
比率は約５０〜８０重量％の範囲が適当である。When forming master pellets, the ratio of metal fibers to synthetic resin is suitably in the range of about 50 to 80% by weight.
［発明の実施例」 以下本発明の実施例について記載する。[Embodiments of the invention” Examples of the present invention will be described below.
実施例
ＰＢバーマロｒの周りに銅を被覆してなる直径５０μｍ
のデュメット線を２００本束ね、その外側にＡＢＳ樹脂
を一体に被覆した後、これをカッタにより約５ｍｍの長
さに切断してマスターペレットを製造した。このマスタ
ーペレットのデュメツト線とＡＢＳ樹脂の比率はＡＢＳ
樹脂；デュメツト線＝１＝２が適当である。次いでこの
マスターペレッ１へとＡＢＳ樹脂のナチュラルペレット
とを、マスターペレットー：ナチュラルペレット−１：
１となるよう混合し、これを押出機に供給してシールド
ケースを射出成形した。Example PB Vermaro r coated with copper, diameter 50 μm
After bundling 200 Dumet wires and integrally covering the outside with ABS resin, this was cut into a length of about 5 mm with a cutter to produce a master pellet. The ratio of dumet wire and ABS resin in this master pellet is ABS
Resin; Dumet line = 1 = 2 is appropriate. Next, the ABS resin natural pellets are added to this master pellet 1, and the master pellet-:natural pellet-1:
1 and supplied to an extruder to injection mold a shield case.
得られたシールドケースの電磁波シールド性能を測定し
たところ、１００Ｍ）ｌｚ’ｒ４０〜５０ ｄＢと高い
シールド効果を示した。また、１ＭＨｚの低周波数帯域
においても優れた電磁波シールド効果がみとめられた。When the electromagnetic wave shielding performance of the obtained shield case was measured, it showed a high shielding effect of 100 M)lz'r of 40 to 50 dB. Furthermore, an excellent electromagnetic shielding effect was observed even in the low frequency band of 1 MHz.
［発明の効果］
以上の記載から明らかなように本発明の電磁波シールド
材料は、広範囲の周波数帯域で良好な周波数帯性を有し
、しかも磁界波に対するシールド効果に優れている。[Effects of the Invention] As is clear from the above description, the electromagnetic wave shielding material of the present invention has good frequency band properties over a wide range of frequency bands, and is excellent in shielding effect against magnetic field waves.
従って、本発明の電磁波シールド材料はトランシーバ等
の無線機器、ラジオ、テレビ、電子レンジ等の家電機器
、パソコン等のマイクロプロセッサを内蔵覆るＯＡ機器
、電子計測器等の各種電子機器の筐体等の製造材料とし
て好適している。Therefore, the electromagnetic shielding material of the present invention can be used in the housings of various electronic devices such as wireless devices such as transceivers, home appliances such as radios, televisions, and microwave ovens, office automation equipment that houses and encases microprocessors such as personal computers, and electronic measuring instruments. Suitable as a manufacturing material.
代理人弁理士 則 近 憲 佑 （ばか１名）Representative Patent Attorney Noriyuki Chika (1 idiot)
Claims (7)
合金属繊維を、合成樹脂に混合してなることを特徴とす
る電磁波シールド材料。(1) An electromagnetic shielding material characterized by being made by mixing a composite metal fiber with a multilayer structure consisting of a ferromagnetic material and a highly conductive metal into a synthetic resin.
の範囲第１項記載の電磁波シールド材料。(2) The electromagnetic shielding material according to claim 1, wherein the ferromagnetic material is an alloy containing nickel.
求の範囲第２項記載の電磁波シールド材料。(3) The electromagnetic shielding material according to claim 2, wherein the nickel-containing alloy is permalloy.
の範囲第１項ないし第３項のいずれか１項記載の電磁波
シー ルド材料。(4) The electromagnetic shielding material according to any one of claims 1 to 3, wherein the highly conductive metal is copper or a copper alloy.
項ないし第４項のいずれか１項記載の電磁波シールド材
料。(5) The first composite metal fiber is a thin dumet wire.
The electromagnetic shielding material according to any one of Items 1 to 4.
一方の金属からなる芯線の外側に他方の金属を押出、め
っき、蒸着または溶融浸漬により被覆しＣなるものであ
る特許請求の範囲第１項ないし第５項のいずれか１項記
載の電磁波シールド材料。(6) The composite metal fiber is made by coating a core wire made of one of a ferromagnetic material and a highly conductive metal with the other metal by extrusion, plating, vapor deposition, or melt dipping. The electromagnetic shielding material according to any one of items 1 to 5.
し、これをペレット状に切断してなるマスターペレット
が、合成樹脂のナチュラルペレットと混合されている特
許請求の範囲第１項ないし第６項のいずれか１項記載の
電磁波シールド材料。(7) Claims 1 to 3, wherein master pellets obtained by coating the outside of a composite metal fiber bundle with a thermoplastic synthetic resin and cutting the same into pellets are mixed with natural synthetic resin pellets. The electromagnetic shielding material according to any one of item 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58241849A JPS60134500A (en) | 1983-12-23 | 1983-12-23 | Electromagnetic wave shielding material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58241849A JPS60134500A (en) | 1983-12-23 | 1983-12-23 | Electromagnetic wave shielding material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60134500A true JPS60134500A (en) | 1985-07-17 |
Family
ID=17080418
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58241849A Pending JPS60134500A (en) | 1983-12-23 | 1983-12-23 | Electromagnetic wave shielding material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60134500A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62276899A (en) * | 1986-05-24 | 1987-12-01 | 新日本製鐵株式会社 | Amorphous alloy short fiber for electromagnetic shielding |
| JPS62276900A (en) * | 1986-05-24 | 1987-12-01 | 新日本製鐵株式会社 | Electromagnetic shielding material |
| JPS62276897A (en) * | 1986-05-24 | 1987-12-01 | 新日本製鐵株式会社 | Magnetic shielding material |
| JPS63191069A (en) * | 1986-12-12 | 1988-08-08 | Mitsubishi Electric Corp | Current detector |
| JPH07245495A (en) * | 1994-03-03 | 1995-09-19 | Cmk Corp | Printed board material containing magnetic material in insulation layer |
| JP2005150149A (en) * | 2003-11-11 | 2005-06-09 | Fujitsu Hitachi Plasma Display Ltd | Display device |
-
1983
- 1983-12-23 JP JP58241849A patent/JPS60134500A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62276899A (en) * | 1986-05-24 | 1987-12-01 | 新日本製鐵株式会社 | Amorphous alloy short fiber for electromagnetic shielding |
| JPS62276900A (en) * | 1986-05-24 | 1987-12-01 | 新日本製鐵株式会社 | Electromagnetic shielding material |
| JPS62276897A (en) * | 1986-05-24 | 1987-12-01 | 新日本製鐵株式会社 | Magnetic shielding material |
| JPS63191069A (en) * | 1986-12-12 | 1988-08-08 | Mitsubishi Electric Corp | Current detector |
| JPH07245495A (en) * | 1994-03-03 | 1995-09-19 | Cmk Corp | Printed board material containing magnetic material in insulation layer |
| JP2005150149A (en) * | 2003-11-11 | 2005-06-09 | Fujitsu Hitachi Plasma Display Ltd | Display device |
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