JP2012204734A - Radio wave suppression sheet, and electronic apparatus and radio wave suppression component equipped with this sheet - Google Patents
Radio wave suppression sheet, and electronic apparatus and radio wave suppression component equipped with this sheet Download PDFInfo
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- 230000005540 biological transmission Effects 0.000 claims abstract description 24
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- 239000006229 carbon black Substances 0.000 description 2
- 239000004917 carbon fiber Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
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- 229920001971 elastomer Polymers 0.000 description 2
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- 238000004806 packaging method and process Methods 0.000 description 2
- 229920005672 polyolefin resin Polymers 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 229920000181 Ethylene propylene rubber Polymers 0.000 description 1
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- 244000043261 Hevea brasiliensis Species 0.000 description 1
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- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 1
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
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Abstract
Description
本発明は、低周波数のマイクロ波に対し優れた電波吸収性能及び電波遮断性能を発揮する電波抑制シートとこのシートを具備した電子機器及び電波抑制用部品に関するものである。 The present invention relates to a radio wave suppression sheet that exhibits excellent radio wave absorption performance and radio wave blocking performance with respect to low-frequency microwaves, an electronic device including the sheet, and a radio wave suppression component.
近年、比較的低周波数のマイクロ波を利用したパソコン、携帯電話、携帯情報端末、道路情報システム、無線ラン等の電子機器が広く普及してきているが、これらの電子機器の普及に伴って、電子機器から放射される電磁波がもたらす他の電子機器への誤動作や、人体への影響が問題とされてきている。
そのため、他の電子機器や人体に影響を与えないように、電磁波をできるだけ放出しないこと、また外部から電磁波を受けても誤作動しないことが求められており、電子機器に対し電波吸収性能及び電波遮断性能（以下、電波シールド性能という）を付与することができる電波抑制シートの開発が多数行われている。
In recent years, electronic devices such as personal computers, mobile phones, personal digital assistants, road information systems, wireless LANs, etc. that use microwaves of relatively low frequency have been widely used. Malfunctions of other electronic devices caused by electromagnetic waves radiated from the devices and effects on the human body have been a problem.
For this reason, it is required that electromagnetic waves be not emitted as much as possible so that they do not affect other electronic devices and the human body, and that they do not malfunction even when receiving external electromagnetic waves. Many radio wave suppression sheets have been developed that can provide blocking performance (hereinafter referred to as radio wave shielding performance).
例えば、特許文献１に示されるように、ポリオレフィン系樹脂などの有機高分子や、ゴムからなる有機高分子からなる基体表層に鉄合金やフェライト等の強磁性体を蒸着した電波抑制シートや、特許文献２に示されるように、樹脂とナノサイズ炭素原料を含んだ電波抑制シートなどが提案されている。
For example, as shown in
また、最近では前記電子機器が更に小型化、高密度化してきており、貼り合わせ等して使用する電波抑制シートとしては、より薄いものが要求されるようになってきた。しかしながら、シート厚みを薄くしていくと電波シールド性能は低下する傾向があるため、フィルム状のシートはまだ実用化されていないのが現状である。 Recently, the electronic devices have been further miniaturized and densified, and thinner radio wave suppression sheets have been required for use by bonding and the like. However, since the radio wave shielding performance tends to decrease as the thickness of the sheet is reduced, a film-like sheet has not yet been put into practical use.
一方、電波シールド性能の評価のひとつに、マイクロストリップ法による伝送減衰率（Ｒｔｐ）がある。この伝送減衰率（Ｒｔｐ）が２０ｄＢでは９９％、３０ｄＢでは９９．９％、４０ｄＢでは９９．９９％の電波を吸収するのに相当すると言われており、従来の電子機器の電波吸収目標値は２０ｄＢとされてきた。
しかし、電子機器の使用頻度や使用時間は増加する傾向にあって、電子機器の誤動作や人体への影響が少ない電波吸収能力のより高い電波抑制シートの開発が求められるようになってきている。特に、携帯電話や電子レンジや無線ランや各種リモコン等の電子機器は周波数が５ＧＨｚ以下の比較的に低周波数のマイクロ波を使用しているが、従来の電波抑制シートでは、周波数が５ＧＨｚ以下のマイクロ波を９９．９９％の割合で吸収することができるもの（伝送減衰率が４０ｄＢを超えるもの）はなかった。そのため、周波数が５ＧＨｚ以下の比較的に低周波数のマイクロ波も確実に吸収することができる電波抑制シートの開発が強く望まれるようになってきた。
On the other hand, one of the evaluations of the radio wave shielding performance is a transmission attenuation factor (Rtp) by a microstrip method. It is said that this transmission attenuation rate (Rtp) is equivalent to absorbing radio waves of 99% at 20 dB, 99.9% at 30 dB, and 99.99% at 40 dB. It has been set to 20 dB.
However, the frequency and time of use of electronic devices tend to increase, and there has been a demand for the development of a radio wave suppression sheet with higher radio wave absorption capability that has less malfunction of electronic devices and less influence on the human body. In particular, electronic devices such as mobile phones, microwave ovens, wireless runs, and various remote controllers use relatively low frequency microwaves with a frequency of 5 GHz or less, but conventional radio wave suppression sheets have a frequency of 5 GHz or less. None of them was capable of absorbing microwaves at a rate of 99.99% (a transmission attenuation factor exceeding 40 dB). Therefore, it has been strongly desired to develop a radio wave suppression sheet that can absorb relatively low frequency microwaves having a frequency of 5 GHz or less.
本発明は上記のような問題点を解決して、周波数が５ＧＨｚ以下の比較的に低周波数のマイクロ波を高い吸収能力で遮断して電子機器の誤動作や人体への影響を少なくすることができ、しかもフィルム状のシートであって軽くて嵩張らないため電子機器の更なる小型化、高密度化にも対応することができる電波抑制シートとこのシートを具備した電子機器及び電波抑制用部品を提供することを目的として完成されたものである。 The present invention solves the above-mentioned problems, and can cut down relatively low frequency microwaves having a frequency of 5 GHz or less with high absorption capability, thereby reducing malfunctions of electronic devices and effects on the human body. In addition, since it is a film-like sheet that is light and not bulky, it provides a radio wave suppression sheet that can cope with further miniaturization and high density of electronic devices, an electronic device equipped with this sheet, and radio wave suppression components It was completed for the purpose of doing.
上記課題を解決するためになされた本発明の電波抑制シートは、シリコーンゴムにカーボンナノチューブを分散させて、厚みが３００μｍ以下のフィルム状に成形してあることを特徴とするものである。 The radio wave suppression sheet of the present invention made to solve the above problems is characterized in that carbon nanotubes are dispersed in silicone rubber and formed into a film having a thickness of 300 μm or less.
前記カーボンナノチューブの含有量が１５質量％以上であることが好ましく、これを請求項２に係る発明とする。
The content of the carbon nanotube is preferably 15% by mass or more, and this is the invention according to
また、周波数が５．０ＧＨｚ以下のマイクロ波に対するマイクロストリップ法による伝送減衰率が、４０ｄＢ以上の部分を有していることが好ましく、これを請求項３に係る発明とする。
Moreover, it is preferable that the transmission attenuation factor by the microstrip method with respect to the microwave whose frequency is 5.0 GHz or less has a part of 40 dB or more, and this is the invention according to
更に、請求項１〜３のいずれかに記載の電波抑制シートを具備したことを特徴とする電子機器を請求項４に係る発明とし、請求項１〜３のいずれかに記載の電波抑制シートを具備したことを特徴とする電波抑制用部品を請求項５に係る発明とする。
Further, an electronic device comprising the radio wave suppression sheet according to any one of
請求項１に係る発明では、シリコーンゴムにカーボンナノチューブを分散させて、厚みが３００μｍ以下のフィルム状に成形してあるので、カーボンナノチューブが高い電波シールド性能を発揮することとなり、またカーボンナノチューブは微細で均一に分散できるので厚みが３００μｍ以下のフィルム状に成形しても高い電波シールド性能を発揮することが可能となる。
In the invention according to
また、請求項２に係る発明では、カーボンナノチューブの含有量を１５質量％以上としたので、高い電波シールド性能を発揮することができる。
Moreover, in the invention which concerns on
また、請求項３に係る発明では、周波数が５．０ＧＨｚ以下のマイクロ波に対するマイクロストリップ法による伝送減衰率が、４０ｄＢ以上の部分を有しているので、比較的に低周波数のマイクロ波も高い能力で吸収することができ、電子機器の誤動作や人体への影響を極力少なくすることができる。
In the invention according to
また、請求項４及び請求項５に係る発明では、電子機器及び電波抑制用部品として高い電波シールド性能を発揮することができる。
Moreover, in the invention which concerns on
以下に、本発明の好ましい実施の形態を示す。
本発明の電波抑制シートは、シリコーンゴムにカーボンナノチューブを分散させて、厚みが３００μｍ以下のフィルム状に成形してある点を特徴としている。
本発明では、シートを形成する母材としてシリコーンゴムを用いている。従来、シート母材としては天然ゴム、エチレン−プロピレンゴムやポリオレフィン樹脂、ポリアミド樹脂等の樹脂系材料を使用するのが普通であった。しかしながら、本発明者の研究によれば、従来の樹脂系材料では電磁波吸収材料を分散させて厚みが３００μｍ以下の薄いフィルム状に成形することが難しいことを確認し、薄いフィルム状に成形するにはシリコーンゴムが最適であることを見出したことによる。
本発明のシートは、厚みが３００μｍ以下のフィルム状としてある。従来の樹脂系材料からなるシートの場合は、プレス成形により厚みが６００μｍ以上のシート体として成形されていたのに対し、本発明は押出インフレーション法などにより厚みが３００μｍ以下の薄膜フィルムとして成形されている。下限についての規制はないが、フィルム成形技術を考えると１０μｍ以上である。
Hereinafter, preferred embodiments of the present invention will be described.
The radio wave suppression sheet of the present invention is characterized in that carbon nanotubes are dispersed in silicone rubber and formed into a film having a thickness of 300 μm or less.
In the present invention, silicone rubber is used as a base material for forming the sheet. Conventionally, it has been usual to use a resin-based material such as natural rubber, ethylene-propylene rubber, polyolefin resin, or polyamide resin as a sheet base material. However, according to the inventor's research, it has been confirmed that it is difficult to disperse the electromagnetic wave absorbing material and form a thin film with a thickness of 300 μm or less by using a conventional resin material. Is due to the finding that silicone rubber is optimal.
The sheet of the present invention is in the form of a film having a thickness of 300 μm or less. In the case of a sheet made of a conventional resin material, the sheet is formed as a sheet body having a thickness of 600 μm or more by press molding, whereas the present invention is formed as a thin film having a thickness of 300 μm or less by an extrusion inflation method or the like. Yes. Although there is no restriction on the lower limit, it is 10 μm or more considering the film forming technique.
また本発明では、電磁波吸収材料として、従来の炭素繊維とカーボンブラックとの混合物に替えてカーボンナノチューブを使用している。
このカーボンナノチューブは、単層または多層からなり、直径が１〜１００ｎｍで長さが３０μｍ以下で、従来の炭素繊維やカーボンブラックと比べて微細な材料である。また、シリコーンゴム中への分散性も優れており、かつ高い電波シールド性能を発揮するものである。
In the present invention, carbon nanotubes are used as the electromagnetic wave absorbing material in place of the conventional mixture of carbon fiber and carbon black.
This carbon nanotube is composed of a single layer or multiple layers, has a diameter of 1 to 100 nm, a length of 30 μm or less, and is a finer material than conventional carbon fibers and carbon black. Further, it has excellent dispersibility in silicone rubber and exhibits high radio wave shielding performance.
シート中における前記カーボンナノチューブの含有量は１５質量％以上であることが好ましい。１５質量％未満の場合は、希望する電波シールド性能が得られないおそれがあるからである。上限については薄膜フィルムの成形及び成形コストを考慮すると４０質量％以下、好ましくは質量３０％以下の範囲である。 The content of the carbon nanotube in the sheet is preferably 15% by mass or more. This is because if it is less than 15% by mass, the desired radio wave shielding performance may not be obtained. The upper limit is in the range of 40% by mass or less, preferably 30% by mass or less considering the molding of the thin film and the molding cost.
前記の構成からなる本発明のシートは、周波数が５．０ＧＨｚ以下のマイクロ波に対するマイクロストリップ法による伝送減衰率が４０ｄＢ以上の部分を有しており、利用が増大している携帯電話や無線ランや各種リモコン等の電子機器に対して高い電波吸収性能及び電波遮断性能（電波シールド性能）を発揮することができる。
前記マイクロストリップ法による伝送減衰率（Ｒｔｐ）は、電波抑制シートのノイズ抑制を評価する方法の一つであり、伝送線路を伝わる伝導ノイズがシート装着時にどれくらい減衰するかを表すものである。測定方法を簡単に説明すると、マイクロストリップライン上に測定試料を乗せ、上から５００ｇの荷重をかけたうえで、高周波信号を入射し、測定試料（電波抑制シート）によって、どれだけ信号が減衰したかを評価する。伝送減衰率（Ｒｔｐ）は、入射と反射の差をとり、その値と透過量の比で求めることができ、この値が測定試料がどれだけの信号を減衰（吸収）させたかをあらわす指標となる。
The sheet of the present invention having the above-described configuration has a portion with a transmission attenuation factor of 40 dB or more by a microstrip method with respect to a microwave having a frequency of 5.0 GHz or less. And high radio wave absorption performance and radio wave shielding performance (radio wave shielding performance) for electronic devices such as various remote controls.
The transmission attenuation rate (Rtp) by the microstrip method is one of the methods for evaluating the noise suppression of the radio wave suppression sheet, and represents how much the conduction noise transmitted through the transmission line is attenuated when the sheet is mounted. Briefly explaining the measurement method, a measurement sample is placed on the microstrip line, a load of 500 g is applied from above, a high frequency signal is incident, and how much the signal is attenuated by the measurement sample (radio wave suppression sheet). To evaluate. The transmission attenuation factor (Rtp) can be obtained by taking the difference between incidence and reflection and calculating the ratio between the value and the amount of transmission, and this value is an index indicating how much signal the measurement sample has attenuated (absorbed). Become.
本発明の実施態様として、前記電波抑制シートを具備した電子機器とすることができる。具体例としては、電子機器の筐体、回路基板、プリント配線板、電子素子、ＬＳＩ，ＩＣチップ、ケーブルなどを挙げることができ、本発明の電子機器は、前記電波抑制シートを電子機器に装備・装着することで得られる。 As an embodiment of the present invention, an electronic apparatus including the radio wave suppression sheet can be provided. Specific examples include a case of an electronic device, a circuit board, a printed wiring board, an electronic element, an LSI, an IC chip, a cable, and the like. The electronic device of the present invention is equipped with the radio wave suppression sheet in the electronic device. -Obtained by wearing.
本発明の実施態様として、前記電波抑制シートを具備した電波抑制用部品とすることができる。電波抑制用部品とは、前記電子機器に装備・装着して発生した電波を抑制するために使用される基板、収納容器、蓋、包装などであって、具体例としては、回路基板、プリント配線板、電子素子、ＬＳＩ，ＩＣチップ、ケーブルといった電子機器の基板、収納容器、蓋、包装などとして用いられる。 As an embodiment of the present invention, a radio wave suppression component including the radio wave suppression sheet can be provided. Radio wave suppression components are substrates, storage containers, lids, packaging, etc. that are used to suppress radio waves generated by mounting and mounting on the electronic equipment. Specific examples include circuit boards and printed wiring. It is used as a board, storage container, lid, packaging, etc. for electronic devices such as plates, electronic elements, LSIs, IC chips, and cables.
次に、本発明の実施例について説明する。
コーンゴムにカーボンナノチューブを分散させて、厚みが１００〜３００μｍのフィルムを成形した。フィルムの厚みとカーボンナノチューブの含有量を以下のように実施例１〜６まで変えて、得られた電波抑制シートのマイクロストリップ法による伝送減衰率（Ｒｔｐ）を測定した。
実施例１（フィルム厚み：３００μｍ、カーボンナノチューブ含有量：１５質量％）
実施例２（フィルム厚み：３００μｍ、カーボンナノチューブ含有量：３０質量％）
実施例３（フィルム厚み：２００μｍ、カーボンナノチューブ含有量：１５質量％）
実施例４（フィルム厚み：２００μｍ、カーボンナノチューブ含有量：３０質量％）
実施例５（フィルム厚み：１００μｍ、カーボンナノチューブ含有量：１５質量％）
実施例６（フィルム厚み：１００μｍ、カーボンナノチューブ含有量：３０質量％）
実施例〜６の測定結果を、図１〜６に示す。これらのグラフから、実施例１では周波数が約２．３ＧＨｚ以上のマイクロ波を伝送減衰率が４０ｄＢ以上（吸収率は９９．９９％以上）で吸収できることが確認できた。また、実施例２では周波数が約１．８ＧＨｚ以上、実施例３では周波数が約２．８ＧＨｚ以上、実施例４では周波数が約１．７ＧＨｚ以上、実施例５では周波数が約４．２ＧＨｚ以上、実施例６では周波数が約１．８ＧＨｚ以上のマイクロ波を伝送減衰率が４０ｄＢ以上で各々吸収できることが確認できた。
Next, examples of the present invention will be described.
Carbon nanotubes were dispersed in corn rubber to form a film having a thickness of 100 to 300 μm. The thickness of the film and the content of carbon nanotubes were changed as in Examples 1 to 6 as follows, and the transmission attenuation rate (Rtp) of the obtained radio wave suppression sheet by the microstrip method was measured.
Example 1 (film thickness: 300 μm, carbon nanotube content: 15 mass%)
Example 2 (film thickness: 300 μm, carbon nanotube content: 30% by mass)
Example 3 (film thickness: 200 μm, carbon nanotube content: 15% by mass)
Example 4 (film thickness: 200 μm, carbon nanotube content: 30% by mass)
Example 5 (film thickness: 100 μm, carbon nanotube content: 15% by mass)
Example 6 (film thickness: 100 μm, carbon nanotube content: 30% by mass)
The measurement results of Examples 6 to 6 are shown in FIGS. From these graphs, it was confirmed that in Example 1, a microwave having a frequency of about 2.3 GHz or more can be absorbed with a transmission attenuation rate of 40 dB or more (absorption rate of 99.99% or more). In Example 2, the frequency is about 1.8 GHz or more, in Example 3, the frequency is about 2.8 GHz or more, in Example 4, the frequency is about 1.7 GHz or more, and in Example 5, the frequency is about 4.2 GHz or more. In Example 6, it was confirmed that microwaves having a frequency of about 1.8 GHz or more can be absorbed at a transmission attenuation rate of 40 dB or more.
一方、比較例として、フィルム厚みを６００μｍ、カーボンナノチューブ含有量を１０質量％とした電波抑制シートを成形し、同様にマイクロストリップ法による伝送減衰率（Ｒｔｐ）を測定した結果を図７に示す。
図７のグラフから、比較例のシートは、周波数が５．０ＧＨｚ以下のマイクロ波に対するマイクロストリップ法による伝送減衰率が４０ｄＢ以下であり、本発明のような高い電波シールド性能を発揮することができないことが確認できた。
On the other hand, as a comparative example, a radio wave suppression sheet having a film thickness of 600 μm and a carbon nanotube content of 10% by mass was formed, and the result of measuring the transmission attenuation factor (Rtp) by the microstrip method is shown in FIG.
From the graph of FIG. 7, the sheet of the comparative example has a transmission attenuation factor of 40 dB or less by a microstrip method for a microwave having a frequency of 5.0 GHz or less, and cannot exhibit the high radio wave shielding performance as in the present invention. I was able to confirm.
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| JP2016086133A (en) * | 2014-10-28 | 2016-05-19 | シヤチハタ株式会社 | Radio wave absorber, and electronic apparatus including radio wave absorber, automatic toll collection system, and on-vehicle radar device |
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| JP2019110022A (en) * | 2017-12-18 | 2019-07-04 | 日立金属株式会社 | Cable for signal transmission |
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