JP6461414B1 - 電磁波吸収複合シート - Google Patents
電磁波吸収複合シート Download PDFInfo
- Publication number
- JP6461414B1 JP6461414B1 JP2018145742A JP2018145742A JP6461414B1 JP 6461414 B1 JP6461414 B1 JP 6461414B1 JP 2018145742 A JP2018145742 A JP 2018145742A JP 2018145742 A JP2018145742 A JP 2018145742A JP 6461414 B1 JP6461414 B1 JP 6461414B1
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- JP
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- Prior art keywords
- electromagnetic wave
- film
- wave absorbing
- magnetic
- composite sheet
- 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.)
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- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- UPHIPHFJVNKLMR-UHFFFAOYSA-N chromium iron Chemical compound [Cr].[Fe] UPHIPHFJVNKLMR-UHFFFAOYSA-N 0.000 description 1
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Abstract
【解決手段】 磁性電磁波吸収フィルムの上に電磁波シールドフィルムを積層してなり、磁性電磁波吸収フィルムがバインダ樹脂に均一に分散させた磁性粉からなり、電磁波シールドフィルムが、導電性金属の箔、導電性金属の薄膜又は塗膜を有するプラスチックフィルム、又はカーボンシートであり、磁性電磁波吸収フィルムに対する電磁波シールドフィルムの面積率が20〜80%である電磁波吸収複合シート。
【選択図】 図1(b)
Description
磁性電磁波吸収フィルムの上に電磁波シールドフィルムを積層してなり、
前記磁性電磁波吸収フィルムがバインダ樹脂に均一に分散させた磁性粉からなり、
前記磁性電磁波吸収フィルムに対する前記電磁波シールドフィルムの面積率が20〜80%であることを特徴とする。
図2に示すように、磁性電磁波吸収フィルム1はバインダ樹脂12に均一に分散させた磁性粉11からなる。
磁性粉11は軟磁性金属又は軟磁性フェライトの粉末である。
優れた可撓性を有するバインダ樹脂12としては、ポリエチレン、ポリプロピレン等のポリオレフィン、ポリエチレンテレフタレート等のポリエステル、ポリスチレン、ポリ塩化ビニル、アクリル樹脂、ポリウタレン、ポリカーボネート、ポリアミド、ポリイミド、シリコン樹脂、合成ゴム、天然ゴム等が挙げられる。
磁性電磁波吸収フィルム1における磁性粉11の含有量は30体積%以上であるのが好ましく、30〜60体積%であるのがより好ましい。
磁性電磁波吸収フィルム1の厚さは0.05〜2 mmであるのが好ましく、0.1〜1 mmであるのがより好ましい。磁性電磁波吸収フィルムの厚さが0.05 mm未満であると、磁性粉による電磁波吸収能が十分に得られず、また2 mm超であると、電磁波吸収複合シート全体が厚くなりすぎる。
磁性電磁波吸収フィルム1を透過した電磁波ノイズを反射して磁性電磁波吸収フィルム1に再投入させるために、電磁波シールドフィルム2は電磁波ノイズを反射する機能を有する必要がある。かかる機能を効果的に発揮するために、電磁波シールドフィルム2は導電性金属の箔、導電性金属の薄膜又は塗膜を有するプラスチックフィルム、又はカーボンシートであるのが好ましい。磁性電磁波吸収フィルム1と電磁波シールドフィルム2の積層は、非導電性接着剤を介して行うのが好ましい。接着剤又は粘着剤は公知のもので良い。
前記導電性金属はアルミニウム、銅、銀、錫、ニッケル、コバルト、クロム及びこれらの合金からなる群から選ばれた少なくとも一種の金属からなるのが好ましい。導電性金属の箔は5〜50μmの厚さを有するものが好ましい。
前記導電性金属の薄膜は前記導電性金属の蒸着膜であるのが好ましい。金属蒸着膜の厚さは数十nm〜数十μmであれば良い。前記導電性金属の蒸着膜を形成するプラスチックフィルムを形成する樹脂は、絶縁性とともに十分な強度、可撓性及び加工性を有する限り特に制限されず、例えばポリエステル(ポリエチレンテレフタレート等)、ポリアリーレンサルファイド(ポリフェニレンサルファイド等)、ポリアミド、ポリイミド、ポリアミドイミド、ポリエーテルサルフォン、ポリエーテルエーテルケトン、ポリカーボネート、アクリル樹脂、ポリスチレン、ポリオレフィン(ポリエチレン、ポリプロピレン等)等が挙げられる。強度及びコストの観点から、ポリエチレンテレフタレート(PET)が好ましい。プラスチックフィルムの厚さは8〜30μm程度で良い。
前記導電性金属の塗膜は、熱可塑樹脂又は光硬化性樹脂に銀粉等の導電性金属粉を高分散させたインク(ペースト)をプラスチックフィルムに塗布し、乾燥させた後、紫外線照射を行うことにより形成することができる。導電性インク(ペースト)は公知のもので良く、例えば70〜90質量%の導電性フィラー、光重合開始剤及び高分子分散剤を含有し、導電性フィラーの50質量%以上が鱗片状、箔状又はフレーク状であって、D50の粒径が0.3〜3.0μmの銀粉である光硬化型導電性インク組成物(特開2016-14111号)を使用することができる。前記導電性金属の塗膜を形成するプラスチックフィルムは、導電性金属の薄膜を形成するプラスチックフィルムと同じで良い。
電磁波シールドフィルムとして使用するカーボンシートは、ポリイミドフィルムを不活性ガス中で超高温加熱処理することにより形成した市販のPGS(登録商標)グラファイトシート(パナソニック株式会社)、グラファイト粉末とカーボンブラックからなるカーボンシート(放熱シート)等である。
(1) 面積比
図1(b) に示すように、磁性電磁波吸収フィルム1に対する電磁波シールドフィルム2の面積率は20〜80%である。面積率が20%未満であるか80%超であると、所望の周波数域での電磁波ノイズに対する吸収能の極大化が十分でなくなる。これは予期できなかった結果であり、磁性電磁波吸収フィルム1に対する電磁波シールドフィルム2の面積率が20〜80%であることは本発明の重要な特徴である。面積率の下限は30%が好ましく、40%がより好ましく、45%が最も好ましい。また、面積率の上限は70%が好ましく、65%がより好ましく、60%が最も好ましい。磁性電磁波吸収フィルム1に対する電磁波シールドフィルム2の面積率の範囲は、例えば、30〜70%が好ましく、40〜65%がより好ましく、45〜60%が最も好ましい。
磁性電磁波吸収フィルム1の中心に電磁波シールドフィルム2の中心が位置するのが好ましいが、電磁波吸収能のピーク周波数を変えるためにずらしても良い。電磁波シールドフィルム2の位置ずれには、図3(a) に示すように磁性電磁波吸収フィルム1に対して電磁波シールドフィルム2を一方向にずらす場合、及び図3(b) に示すように電磁波シールドフィルム2の四辺が磁性電磁波吸収フィルム1の四辺から離隔するように、電磁波シールドフィルム2のサイズを小さくする場合がある。いずれの場合も電磁波吸収能のピーク周波数に影響があるので、電磁波吸収能が極大化する周波数域に応じて電磁波シールドフィルム2のずらし方及びサイズを適宜設定するのが好ましい。なお、図3(a) の場合及び図3(b) の場合のいずれでも、磁性電磁波吸収フィルム1に対する電磁波シールドフィルム2の面積率は上記条件を満たす必要がある。
市販のノイズ吸収シート(株式会社ワイドワークスの「ノイズフセーグ10S」、WW-GM10-S、厚さ1 mm)から50 mm×50 mmの磁性電磁波吸収フィルム片1を切り出し、各磁性電磁波吸収フィルム片1に、L(10 mm,20 mm,25 mm,30 mm,40 mm,50 mm,)×50 mmのサイズのアルミニウム箔片(厚さ:15μm)2をそれぞれ非導電性接着剤を介して積層し、サンプル1〜6を作成した。各サンプルにおいて、アルミニウム箔片2の中心は磁性電磁波吸収フィルム片1の中心と一致していた。
実施例1で用いた50 mm×50 mmのサイズの磁性電磁波吸収フィルム片に、25 mm×50 mmのサイズのアルミニウム箔片(厚さ:15μm)を、図3(a) に示すように磁性電磁波吸収フィルム片の一辺X1とアルミニウム箔片の一辺X2(X1と平行)との距離Dが0 mm,5 mm,10 mm,15 mm及び20 mmとなるように、非導電性接着剤を介して積層し、サンプル11〜15を作成した。各サンプルを、図5に示すように絶縁基板300上のマイクロストリップラインMSLの上に載置し、0.1〜6 GHzにおけるノイズ吸収率Ploss/Pinを測定した。結果を図12〜図16に示す。また、各サンプルの距離D、2 GHzにおけるノイズ吸収率Ploss/Pin、及び最大ノイズ吸収率Ploss/Pin並びにそのときの周波数を求めた。結果を表2に示す。
図17に示すように、実施例1と同じ50 mm×50 mmのサイズの磁性電磁波吸収フィルム片上に、面積率が50%で正方形のアルミニウム箔片、及び面積率が50%で正方形の枠形のアルミニウム箔片をそれぞれ中心が一致するように積層し、サンプル21及び22を作成した。各サンプルのノイズ吸収率Ploss/Pinを測定した。測定結果を図18(a) 及び図18(b) に示す。
アマゾンのFire Stick TVのICチップを覆う大きさの電磁波吸収複合シートを作成した。磁性電磁波吸収フィルムはICチップと同じ大きの正方形であり、アルミニウム箔は磁性電磁波吸収フィルムに対する面積率が50%の長方形であった。また、アルミニウム箔の一方の対向辺は磁性電磁波吸収フィルムの一方の対向辺と一致しており、かつ積層されたアルミニウム箔の中心は磁性電磁波吸収フィルムの中心と一致していた。すなわち、実施例4の電磁波吸収複合シートは、図1(b) に示す形状を有していた。
2・・・電磁波シールドフィルム
10・・・電磁波吸収複合シート
11・・・磁性粉
12・・・バインダ樹脂
300・・・絶縁基板
301・・・接地グランド電極
302・・・導電性ピン
303・・・同軸ケーブル
D・・・磁性電磁波吸収フィルム片の一辺X1とアルミニウム箔片の一辺X2との距離
MSL・・・マイクロストリップライン
NA・・・ネットワークアナライザ
Claims (4)
- 電磁波吸収複合シートであって、
磁性電磁波吸収フィルムの上に電磁波シールドフィルムを積層してなり、
前記磁性電磁波吸収フィルムがバインダ樹脂に均一に分散させた磁性粉からなり、
前記磁性電磁波吸収フィルムに対する前記電磁波シールドフィルムの面積率が20〜80%であることを特徴とする電磁波吸収複合シート。 - 請求項1に記載の電磁波吸収複合シートにおいて、前記磁性電磁波吸収フィルムに対する前記電磁波シールドフィルムの面積率が30〜70%であることを特徴とする電磁波吸収複合シート。
- 請求項1又は2に記載の電磁波吸収複合シートにおいて、前記電磁波シールドフィルムが導電性金属の箔、導電性金属の薄膜又は塗膜を有するプラスチックフィルム、又はカーボンシートであることを特徴とする電磁波吸収複合シート。
- 請求項1〜3のいずれかに記載の電磁波吸収複合シートにおいて、前記磁性電磁波吸収フィルム及び前記電磁波シールドフィルムがいずれも長方形又は正方形であることを特徴とする電磁波吸収複合シート。
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SE545290C2 (en) * | 2020-10-09 | 2023-06-20 | Mxwaves Ab | Absorption sheet, system and method for performing radiation characterization |
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KR20200015374A (ko) | 2020-02-12 |
US20200045859A1 (en) | 2020-02-06 |
DE102019118382A1 (de) | 2020-02-06 |
JP2020021864A (ja) | 2020-02-06 |
CN110799027A (zh) | 2020-02-14 |
TW202007527A (zh) | 2020-02-16 |
KR102147185B1 (ko) | 2020-08-24 |
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