JP2003124682A - Electromagnetic wave absorbing (suppressing) sheet - Google Patents

Electromagnetic wave absorbing (suppressing) sheet

Info

Publication number
JP2003124682A
JP2003124682A JP2001321339A JP2001321339A JP2003124682A JP 2003124682 A JP2003124682 A JP 2003124682A JP 2001321339 A JP2001321339 A JP 2001321339A JP 2001321339 A JP2001321339 A JP 2001321339A JP 2003124682 A JP2003124682 A JP 2003124682A
Authority
JP
Japan
Prior art keywords
electromagnetic wave
sheet
suppressing
alloy powder
wave absorbing
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
Application number
JP2001321339A
Other languages
Japanese (ja)
Inventor
Kazuo Fujiwara
和夫 藤原
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Ceramic Co Ltd
Original Assignee
Nippon Ceramic Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nippon Ceramic Co Ltd filed Critical Nippon Ceramic Co Ltd
Priority to JP2001321339A priority Critical patent/JP2003124682A/en
Publication of JP2003124682A publication Critical patent/JP2003124682A/en
Pending legal-status Critical Current

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  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic wave absorbing (suppressing) sheet in which evil influence of electromagnetic wave can be prevented even if the sheet is formed extremely thin. SOLUTION: Scale-like powder of 78Ni-Fe alloy is dispersed into and mixed with silicon resin to produce a sheet-like electromagnetic wave absorbing sheet.

Description

【発明の詳細な説明】Detailed Description of the Invention

【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吸収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-shaped electromagnetic wave absorber for the purpose of suppressing unnecessary electromagnetic waves generated from electronic equipment and preventing harmful effects of 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 from electronic devices are
Mutual interference occurs inside the equipment, and it is also affected by electromagnetic waves coming from outside. In order to prevent these obstacles and to shield electromagnetic waves generated from electronic devices so that they are not emitted to the outside, ferrite powder or soft magnetic metal powder has been dispersed in a resin to suppress electromagnetic waves. It was taken off. However, it absorbs electromagnetic waves,
The suppression effect depends largely on the thickness of the suppressor, and a thin object (especially a thickness of 1 mm or less) has not been sufficiently effective.

【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
磁波吸収体が求められ、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
電磁波吸収体の提供を行う。
With the recent miniaturization, weight reduction, and expansion of harmful effects of electronic devices, thinner electromagnetic wave absorbers are required, and substances having a large absorption amount and a high shielding effect are required. Has become. Provide an electromagnetic wave absorber that can meet these demands.

【0004】[0004]

【課題を解決するための手段】78Ni−Fe合金粉を
シリコン樹脂に分散、混合させて、それをシート状に作
成した電磁波吸収体とする。又、この78Ni−Fe合
金粉は、鱗片状とする。さらに、シリコン樹脂と78N
i−Fe合金粉の混合比率は、樹脂重量100%に対し
て、78Ni−Fe合金粉は200%以上とする。又、
78Ni−Fe合金にMo、Cr、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] 78Ni-Fe alloy powder is dispersed and mixed in a silicon resin to prepare a sheet-shaped electromagnetic wave absorber. The 78Ni-Fe alloy powder is scale-like. Furthermore, silicone resin and 78N
The mixing ratio of the i-Fe alloy powder is set to 200% or more with respect to the resin weight of 100% with respect to the 78Ni-Fe alloy powder. or,
It is characterized in that 5% by weight or less of at least one metal selected from Mo, Cr, and Mn is added to the 78Ni-Fe alloy.

【0005】[0005]

【発明の実施の形態】各種のフェライト粉末及びFe−
Si係合金、Fe−Co係合金、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
波吸収体として、必要な諸特性を測定した。その結果、
78Ni−Fe合金の鱗片状粉体を分散混合して作成し
た電磁波吸収体が、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、電磁波吸収体
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78Ni−Fe合金粉(鱗片状)の詳細を検討する
作業を進め、シリコン樹脂と78Ni−Fe合金粉(鱗
片状)の混合比率は、樹脂重量100%に対して、78
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78Ni−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。
BEST MODE FOR CARRYING OUT THE INVENTION Various ferrite powders and Fe-
Si engagement gold, Fe-Co engagement gold, carbon iron, and other soft magnetic alloy powders were prepared. In addition, silicone rubber and ethylene-propylene rubber were prepared as resins. These were weighed based on the planned mixing ratio, and then dispersed and mixed by a kneader. A sheet of 1 mm to 0.1 mm was prepared from this by hot pressing, which is a general rubber manufacturing method. Each of the sheets thus prepared was used as an electromagnetic wave absorber, and necessary characteristics were measured. as a result,
The electromagnetic wave absorber made by dispersing and mixing flaky powders of 78Ni-Fe alloy has extremely excellent characteristics as an electromagnetic wave absorber as compared with a sheet made by dispersing and mixing other ferrite and soft magnetic alloy powders. I found it to be excellent. Furthermore,
The work of examining the details of the 78Ni-Fe alloy powder (scale-like) was advanced, and the mixing ratio of the silicon resin and the 78Ni-Fe alloy powder (scale-like) was 78% with respect to the resin weight of 100%.
It was confirmed that the Ni—Fe alloy powder (scale-like) greatly improves the electromagnetic wave absorption characteristics and the electromagnetic wave shielding characteristics when the weight is 200% or more. In addition, Mo, Cr,
It has been found that the reproducibility of characteristics is improved by adding a trace amount of a metal such as Mn.

【0006】[0006]

【発明の効果】本発明に依り作成された電磁波吸収(抑
制)シートは従来品に比べ極めて薄く(1mm〜0.1
mm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。又、シリコン樹脂を用いる事に依り、
他の樹脂では見られない大きな耐熱性と耐候性を備え
る。
The electromagnetic wave absorbing (suppressing) sheet produced according to the present invention is extremely thin (1 mm to 0.1 mm) as compared with the conventional product.
Even if it is created, it has a large absorption effect and a shielding effect, and it is possible to reduce the size and weight of the electronic device and prevent the harmful effects of electromagnetic waves. Also, by using silicone resin,
It has great heat resistance and weather resistance not found in other resins.

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】78Ni−Fe合金粉をシリコン樹脂に分
散、混合させて作成したシート状の電磁波吸収体。
1. A sheet-shaped electromagnetic wave absorber prepared by dispersing and mixing 78Ni—Fe alloy powder in a silicone resin.
【請求項2】78Ni−Fe合金粉は、鱗片状である事
を特徴とする請求項1に記載した電磁波吸収体。
2. The electromagnetic wave absorber according to claim 1, wherein the 78Ni—Fe alloy powder is in the form of scales.
【請求項3】78Ni−Fe合金粉の混合比率は、シリ
コン樹脂重量100%に対して、78Ni−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 78Ni—Fe alloy powder is 200% or more by weight of the 78Ni—Fe alloy powder with respect to 100% by weight of the silicon resin.
【請求項4】78Ni−FeにMo、Cr、Mnの内よ
り、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. The electromagnetic wave absorber according to claim 1, wherein 5% by weight or less of at least one metal selected from Mo, Cr and Mn is added to 78Ni-Fe.
JP2001321339A 2001-10-19 2001-10-19 Electromagnetic wave absorbing (suppressing) sheet Pending JP2003124682A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2001321339A JP2003124682A (en) 2001-10-19 2001-10-19 Electromagnetic wave absorbing (suppressing) sheet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001321339A JP2003124682A (en) 2001-10-19 2001-10-19 Electromagnetic wave absorbing (suppressing) sheet

Publications (1)

Publication Number Publication Date
JP2003124682A true JP2003124682A (en) 2003-04-25

Family

ID=19138567

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2001321339A Pending JP2003124682A (en) 2001-10-19 2001-10-19 Electromagnetic wave absorbing (suppressing) sheet

Country Status (1)

Country Link
JP (1) JP2003124682A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006147621A (en) * 2004-11-16 2006-06-08 Toray Ind Inc Photosensitive paste and method of manufacturing member for display panel using the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006147621A (en) * 2004-11-16 2006-06-08 Toray Ind Inc Photosensitive paste and method of manufacturing member for display panel using the same

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