JP2003124682A - Electromagnetic wave absorbing (suppressing) sheet - Google Patents
Electromagnetic wave absorbing (suppressing) sheetInfo
- 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
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)
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.
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.
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.
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.
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 (2)
| 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 |
| CN118159012A (en) * | 2024-05-13 | 2024-06-07 | 成都飞机工业（集团）有限责任公司 | Surface-coated carbonyl iron/sendust alloy electromagnetic wave broadband composite absorbent and preparation method thereof |
-
2001
- 2001-10-19 JP JP2001321339A patent/JP2003124682A/en active Pending
Cited By (2)
| 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 |
| CN118159012A (en) * | 2024-05-13 | 2024-06-07 | 成都飞机工业（集团）有限责任公司 | Surface-coated carbonyl iron/sendust alloy electromagnetic wave broadband composite absorbent and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4717754B2 (en) | Flat powder for electromagnetic wave absorber and electromagnetic wave absorber | |
| US9468134B2 (en) | Soft magnetic powder, method of manufacturing the same, noise suppression sheet using the same, and method of manufacturing the same | |
| KR20150064902A (en) | Composition for complex sheet with EMI shielding and absorbing, thermal dissipation and electric insulation, and complex sheet comprising the same | |
| JP2015056618A (en) | Near field radio wave absorbing sheet | |
| JP2003124682A (en) | Electromagnetic wave absorbing (suppressing) sheet | |
| JP2006278433A (en) | Compound electromagnetic noise suppression sheet | |
| JP2002076668A (en) | Electromagnetic wave suppressing sheet | |
| JPH11269503A (en) | Iron-base nano-crystal magnetic powder, its production, and radio wave noise inhibiting member using the same | |
| JP4573918B2 (en) | Flat Fe-based alloy powder for magnetic shield | |
| JP3990658B2 (en) | Electromagnetic wave absorber | |
| JP2005116819A (en) | Flame-retardant compound magnetic sheet | |
| JP2011082278A (en) | Composite magnetic material | |
| JP5879026B2 (en) | Flame retardant noise suppression sheet | |
| JPH0130902B2 (en) | ||
| JP2002344192A (en) | Composite powder for radio wave absorber | |
| JPH1187117A (en) | High-frequency electromagnetic wave absorber | |
| JP7288294B2 (en) | Powder for magnetic parts | |
| JP7277076B2 (en) | Powder for magnetic parts | |
| JP2005123531A (en) | Powder for electromagnetic wave absorber | |
| JP2000200990A (en) | High corrosion resistant microwave absorber | |
| JP2017208415A (en) | Near field noise suppression sheet | |
| JP4936233B2 (en) | Flat Fe-based alloy powder for magnetic shield | |
| JP4709994B2 (en) | Radio wave absorber using Li-Zn ferrite powder | |
| JP2003068510A (en) | Powder for electromagnetic wave absorbing material | |
| JP2000087193A (en) | FLAT Fe-BASE ALLOY POWDER FOR MAGNETIC SHIELDING |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20041018 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20070725 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20070731 |
|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20071127 |