JPH08167787A - Electromagnetic shielding material - Google Patents
Electromagnetic shielding materialInfo
- Publication number
- JPH08167787A JPH08167787A JP6308981A JP30898194A JPH08167787A JP H08167787 A JPH08167787 A JP H08167787A JP 6308981 A JP6308981 A JP 6308981A JP 30898194 A JP30898194 A JP 30898194A JP H08167787 A JPH08167787 A JP H08167787A
- Authority
- JP
- Japan
- Prior art keywords
- aluminum
- electromagnetic shield
- magnetic permeability
- aluminum alloy
- electromagnetic
- 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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- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は磁気シールドルーム用の
建材、あるいは、大型の電子装置を囲む板材としてきわ
めて好適な、静磁場及び低周波域から高周波域までの広
い周波数帯域の電磁波に対して優れたシールド効果を有
する電磁波シールド材に関する。なお、本発明において
は１０ＭＨｚ未満の低周波領域と１０ＭＨｚ以上の高周
波領域のものを含めて電磁波と云い、便宜上、この電磁
波の他に静磁場のシールドを含めて電磁波シールドとい
う。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is suitable for a building material for a magnetically shielded room, or a plate material for enclosing a large electronic device, against static magnetic fields and electromagnetic waves in a wide frequency band from a low frequency region to a high frequency region. The present invention relates to an electromagnetic wave shield material having an excellent shield effect. In the present invention, a low frequency region of less than 10 MHz and a high frequency region of 10 MHz or more are referred to as electromagnetic waves, and for convenience, in addition to this electromagnetic wave, a static magnetic field shield is referred to as an electromagnetic wave shield.
【０００２】[0002]
【従来の技術】従来より、電磁気シールド材としては、
一般に、パーマロイ、Ｆｅ系アモルファス金属等の金属
板材よりなるものが用いられてきているが、パーマロイ
の場合成形後に水素雰囲気下、高温の煩雑な熱処理が必
要であるため高価であるという難点があり、一方アモル
ファス金属も熱処理を施すと脆化する等の問題があっ
た。2. Description of the Related Art Conventionally, as an electromagnetic shield material,
Generally, permalloy, which is made of a metal plate material such as Fe-based amorphous metal, has been used, but in the case of permalloy, it is expensive because it requires complicated heat treatment at high temperature in a hydrogen atmosphere after molding, On the other hand, there is a problem that the amorphous metal also becomes brittle when subjected to heat treatment.
【０００３】即ち、パーマロイの場合、折り曲げたり切
断した際に、加工を施した部位の電磁気シールド特性が
極端に低下するため、長時間の焼鈍処理を施して電磁気
シールド特性を回復させる処理が必要であり、製造コス
トがかなり嵩む。That is, in the case of permalloy, when it is bent or cut, the electromagnetic shield property of the processed part is extremely deteriorated, so that it is necessary to perform a long-time annealing process to recover the electromagnetic shield property. Yes, the manufacturing cost is considerably high.
【０００４】アモルファス金属の場合は急冷法により作
製するため、通常はリボン状であり、使用形状が限定さ
れる上、熱処理を施すと脆化し、非常に割れ易くなり、
防錆処理も必要である。また、オスプレイ等の方法で板
材を作製した場合は、その後の機械加工が非常に困難で
あるし、作製自体大がかりな装置が必要であり、パーマ
ロイ同様コストが嵩む。Since an amorphous metal is produced by a quenching method, it is usually ribbon-shaped, and its use shape is limited, and when it is subjected to heat treatment, it becomes brittle and becomes very easy to crack.
Rust prevention treatment is also required. Further, when a plate material is manufactured by a method such as Osprey, subsequent machining is extremely difficult, and a large-scale device itself is required, and the cost is high as in Permalloy.
【０００５】特開昭４８−９０７６６号公報には、純鉄
やパーマロイなどの高透磁率材料のメッキをステンレス
製時計ケースの内面に施した防磁時計ケースが記載され
ているが、これを建材等の大形板材に適用するときわめ
て重量が大きくなるという問題がある。Japanese Unexamined Patent Publication (Kokai) No. 48-90766 discloses a magnetic-shield watch case in which a stainless steel watch case is plated with a high-permeability material such as pure iron or permalloy. When it is applied to the large-sized plate material, there is a problem that the weight becomes extremely large.
【０００６】[0006]
【発明が解決しようとする課題】上記の通り、従来の電
磁気シールド材には、コスト高である、あるいは重量が
大きいという問題があった。As described above, the conventional electromagnetic shield material has a problem of high cost or large weight.
【０００７】しかも、従来の電磁気シールド材は主に静
磁場や低周波域の電磁波を対象とした遮蔽材であり、高
周波域の電磁波に対しては遮蔽効果がない。また、この
ようなシールド材の他に銅箔などの導電性材料を用いる
ことも知られているが、これは高周波域での電磁波遮蔽
効果を有するものの、静磁場や低周波域では遮蔽効果が
ない。このように、現在、低周波域から高周波域に至る
広い周波数領域において優れた電磁波シールド効果を有
するシールド材は得られていない。Moreover, the conventional electromagnetic shield material is mainly a shield material for static magnetic fields and electromagnetic waves in the low frequency range, and has no shielding effect for electromagnetic waves in the high frequency range. It is also known to use a conductive material such as copper foil in addition to such a shield material, which has an electromagnetic wave shielding effect in a high frequency range, but has a shielding effect in a static magnetic field or a low frequency range. Absent. Thus, at present, a shield material having an excellent electromagnetic wave shielding effect in a wide frequency range from a low frequency range to a high frequency range has not been obtained.
【０００８】電界と磁界は互いに直交して一定の周波数
で振動しながら進行するが、電磁波の伝播においては、
一般に、周波数の低い領域（１０ＭＨｚ未満）では磁界
成分の影響が大きいので、透磁率が高く保磁力の低い軟
磁性材料がその周波数領域のシールド材として適してお
り、また周波数の高い領域（１０ＭＨｚ以上）では電界
成分の影響が大きく、従って、導電率の高い材料が高周
波数領域のシールド材として適している。即ち、シール
ド材としては、静磁場および低周波数領域の電磁波に対
しては高透磁率であり低保磁力の軟磁性材料が適し、高
周波数領域の電磁波に対しては高導電率を有する材料が
適する。The electric field and the magnetic field are orthogonal to each other and travel while oscillating at a constant frequency. In the propagation of electromagnetic waves,
Generally, in the low frequency region (less than 10 MHz), the influence of the magnetic field component is large, so a soft magnetic material having a high magnetic permeability and a low coercive force is suitable as a shield material in that frequency region, and a high frequency region (10 MHz or more). In (), the influence of the electric field component is large, and therefore, a material having high conductivity is suitable as a shield material in the high frequency region. That is, as the shield material, a soft magnetic material having a high magnetic permeability and a low coercive force is suitable for an electromagnetic wave in a static magnetic field and a low frequency region, and a material having a high conductivity for an electromagnetic wave in a high frequency region is suitable. Suitable.
【０００９】本発明は上記従来のシールド材の問題点を
解決し、静磁場を含む低周波域から高周波域に至る広い
周波数帯域の電磁波に対して優れた遮蔽効果を有し、し
かも安価で軽量な電磁気シールド材を提供することを目
的とする。The present invention solves the above-mentioned problems of the conventional shield material, has an excellent shielding effect against electromagnetic waves in a wide frequency band including a static magnetic field from a low frequency region to a high frequency region, and is inexpensive and lightweight. To provide a flexible electromagnetic shield material.
【００１０】[0010]
【課題を解決するための手段】本発明の電磁気シールド
材は、アルミ又はアルミ合金の表面に高透磁率材料層を
形成してなるものである。The electromagnetic shield material of the present invention comprises a high permeability material layer formed on the surface of aluminum or an aluminum alloy.
【００１１】かかる本発明の電磁気シールド材は、アル
ミ又はアルミ合金の板材を目的とする大きさに切断し、
且つ目的形状に加工した後、この板材の表面に高透磁率
材料層を形成することにより製造できる。The electromagnetic shield material of the present invention is obtained by cutting a plate material of aluminum or aluminum alloy into a desired size,
Further, it can be manufactured by forming a high-permeability material layer on the surface of this plate material after processing it into a target shape.
【００１２】このように、アルミ又はアルミ合金の板材
を予め目的とする大きさ及び形状に加工してから高透磁
率材料層を形成すると、高透磁率材料に対し加工による
歪みに基づく磁気特性の劣化が発生しない。この結果、
優れた電磁気シールド特性が得られる。また、母板とし
てアルミ又はアルミ合金を用いるため、電磁気シールド
材としても軽量なものとなる。As described above, when the aluminum or aluminum alloy plate material is processed into the desired size and shape in advance and then the high magnetic permeability material layer is formed, the magnetic characteristics of the high magnetic permeability material based on the strain due to the processing are obtained. No deterioration occurs. As a result,
Excellent electromagnetic shielding characteristics can be obtained. Further, since aluminum or aluminum alloy is used as the mother plate, it is also lightweight as an electromagnetic shield material.
【００１３】母板としては純アルミが好適であるが、Ｍ
ｎ，Ｍｇ等を添加したものも好適である。もちろん、こ
れら以外のアルミ合金をも用い得ることは明らかであ
る。Pure aluminum is suitable for the mother board, but M
It is also preferable to add n, Mg or the like. Of course, it is obvious that aluminum alloys other than these can also be used.
【００１４】アルミ又はアルミ合金の板を加工する方法
としては、切断、溶断、打ち抜きのほか、曲げ、絞りな
ど各種の方法を採用できることも明らかである。このア
ルミ又はアルミ合金の板材の厚さは、この電磁気シール
ド材の使用用途に応じて適宜選定されるが、磁気シール
ドルーム用としては、０．３〜２．０ｍｍ程度とするの
が好適である。As a method of processing a plate of aluminum or an aluminum alloy, it is apparent that various methods such as cutting, fusing and punching as well as bending and drawing can be adopted. The thickness of the aluminum or aluminum alloy plate material is appropriately selected according to the intended use of the electromagnetic shield material, but for a magnetic shield room, it is preferably about 0.3 to 2.0 mm. .
【００１５】このアルミ又はアルミ合金の表面に形成す
る高透磁率材料としては、パーマロイ、センダスト、Ｆ
ｅ系ないしＣｏ系非晶質合金などが好適である。この高
透磁率材料層を形成する方法としては、液相メッキ、気
相メッキ（ＰＶＤ，ＣＶＤなど）などのメッキが好適で
あるが、溶射などの他の膜形成法でも良い。ただし、液
相メッキによれば、緻密層を安価に形成できる。As the high magnetic permeability material formed on the surface of aluminum or aluminum alloy, permalloy, sendust, F
An e-based or Co-based amorphous alloy is suitable. As a method for forming this high magnetic permeability material layer, liquid phase plating, vapor phase plating (PVD, CVD, etc.) and the like are suitable, but other film forming methods such as thermal spraying may be used. However, liquid phase plating can form the dense layer at low cost.
【００１６】この高透磁率材料層の厚さは５〜４０μｍ
とくに１５〜３０μｍ程度が好適である。The thickness of the high magnetic permeability material layer is 5 to 40 μm.
Particularly, about 15 to 30 μm is suitable.
【００１７】[0017]
【作用】本発明の電磁気シールド材はアルミ又はアルミ
合金の表面を高透磁率材料層で被覆したものである。ア
ルミ又はアルミ合金の表面に高透磁率材料層を形成した
ものは、後述する実施例で示すように、静磁場や低周波
域及び高周波域において、優れた電磁波シールド効果を
発揮し、従って、静磁場を含む低周波数域から高周波数
域に至る広い周波数域の電磁波に対して優れた遮蔽効果
を示す上に、軽量かつ安価である。このような電磁波シ
ールド効果は、後述する比較例に示すように、ステンレ
ス板にパーマロイメッキを施したものでは得ることはで
きない。The electromagnetic shield material of the present invention is made by coating the surface of aluminum or aluminum alloy with a high magnetic permeability material layer. A material having a high magnetic permeability material layer formed on the surface of aluminum or an aluminum alloy exhibits an excellent electromagnetic wave shielding effect in a static magnetic field, a low frequency region and a high frequency region, as shown in Examples described later, and therefore, a static magnetic field. In addition to exhibiting an excellent shielding effect against electromagnetic waves in a wide frequency range from a low frequency range including a magnetic field to a high frequency range, it is lightweight and inexpensive. Such an electromagnetic wave shielding effect cannot be obtained with a stainless steel plate plated with permalloy, as shown in a comparative example described later.
【００１８】[0018]
（実施例１）厚さ０．５ｍｍで大きさが３０ｃｍ×３０
ｃｍの純アルミ板の両面に電解メッキ法によりパーマロ
イをメッキ厚３０μｍとなるようにメッキした。また、
大きさが幅３ｃｍ×長さ３０ｃｍの上記と同じ純アルミ
板を幅の中央で９０度折り曲げ、１辺の長さが１．５ｃ
ｍでこれが９０度の角度でつながっており、長さが３０
ｃｍのアングル型のアルミ板にも同様にメッキ厚３０μ
ｍとなるようにメッキした。(Example 1) The thickness is 0.5 mm and the size is 30 cm × 30.
cm of pure aluminum plate was plated with permalloy by electroplating so as to have a plating thickness of 30 μm. Also,
The same pure aluminum plate with a width of 3 cm and a length of 30 cm is bent 90 degrees at the center of the width and one side has a length of 1.5 c.
It is connected at an angle of 90 degrees with m, and the length is 30
cm-type aluminum plate with a plating thickness of 30μ
It was plated so that it would be m.
【００１９】メッキ浴の組成は次の通りである。The composition of the plating bath is as follows.
【００２０】 ＮｉＳＯ4 ・６Ｈ2 Ｏ １００ｇ／ｌ ＦｅＳＯ4 ・７Ｈ2 Ｏ １０ｇ／ｌ Ｈ3 ＢＯ3 ５０ｇ／ｌ 酸化防止剤（ホルマリン） ８ｍｌ／ｌ 界面活性剤（ポリオキシエチレンラウリルエーテル）
４ｍｌ／ｌ メッキ時の電流密度は８Ａ／ｄｍ2 である。NiSO 4 .6H 2 O 100 g / l FeSO 4 .7H 2 O 10 g / l H 3 BO 3 50 g / l Antioxidant (formalin) 8 ml / l Surfactant (polyoxyethylene lauryl ether)
The current density at the time of 4 ml / l plating is 8 A / dm 2 .
【００２１】なお、メッキ層の成分組成を分析したとこ
ろ、次の通りであった。The composition of the plating layer was analyzed and found to be as follows.
【００２２】Ｎｉ：７７．０ｗｔ％ Ｆｅ：２２．３ｗｔ％ このようにして製造された電磁気シールド材の比重は
３．３であった。この電磁気シールド材について電磁気
シールド特性を次のようにして測定した。Ni: 77.0 wt% Fe: 22.3 wt% The specific gravity of the electromagnetic shield material thus manufactured was 3.3. The electromagnetic shield characteristics of this electromagnetic shield material were measured as follows.
【００２３】まず電磁気シールドボックスを作製した。
即ち、硬質塩化ビニルを用いて１辺が３０ｃｍの立方体
を作り、そのうちのひとつの面の中央に穴を開けた。次
にその立方体の６面に磁気シールド材を張り付けた。そ
のうちの１枚には塩化ビニルに開けた穴と同じ大きさの
穴を予め開けておき、それに合わせて張り付けた。更に
立方体の辺部分にアングル型の電磁気シールド材を１辺
に１枚づつ合計１２枚張り付けた。First, an electromagnetic shield box was manufactured.
That is, a cube with one side of 30 cm was made using hard vinyl chloride, and a hole was opened in the center of one of the cubes. Next, a magnetic shield material was attached to the six faces of the cube. A hole of the same size as the hole made in the vinyl chloride was pre-drilled in one of them, and it was attached according to it. Furthermore, a total of 12 angle-type electromagnetic shield materials were attached to each side of the cube, one on each side.
【００２４】図２のように、この電磁気シールドボック
スの中央に塩化ビニルで磁束計を固定し、これを直径
１．５ｍの一軸ヘルムホルツコイルの中央に置き、所定
の周波数、電流を発信器、アンプにより印加し、シール
ドボックスが無い時（Ｂ0 ）と、シールドボックスを置
いた時（Ｂ）の磁束計の値より、次式でシールド性を算
出した。磁束計は３軸式のものを用い、値は実効値を用
いた。As shown in FIG. 2, a magnetometer was fixed with vinyl chloride at the center of this electromagnetic shield box, and this was placed at the center of a uniaxial Helmholtz coil with a diameter of 1.5 m. The shielding property was calculated by the following formula from the value of the magnetometer when there was no shield box (B 0 ) and when the shield box was placed (B). The magnetometer used was a 3-axis type, and the value was an effective value.
【００２５】 シールド性［ｄＢ］＝２０Ｌｏｇ（Ｂ0 ／Ｂ） 結果を図１に示す。Shielding property [dB] = 20Log (B 0 / B) The results are shown in FIG.
【００２６】（比較例１）アルミ板の代わりに同一厚
さ、同一大きさのステンレス板を用いたこと以外は実施
例１と同様にして電磁気シールド材を製造した。この電
磁気シールド材の比重は８．０であった。この電磁気シ
ールド材の電磁気シールド特性を図１に示す。Comparative Example 1 An electromagnetic shield material was manufactured in the same manner as in Example 1 except that a stainless steel plate having the same thickness and the same size was used instead of the aluminum plate. The specific gravity of this electromagnetic shield material was 8.0. The electromagnetic shield characteristics of this electromagnetic shield material are shown in FIG.
【００２７】図１から明らかな通り、本発明の電磁気シ
ールド材は十分な電磁気シールド特性を有する。また、
この電磁気シールド材は著しく軽量である。As is apparent from FIG. 1, the electromagnetic shield material of the present invention has sufficient electromagnetic shield characteristics. Also,
This electromagnetic shield material is extremely lightweight.
【００２８】[0028]
【発明の効果】以上の実施例からも明らかな通り、本発
明の電磁気シールド材は静磁場及び低周波域から高周波
域に至る幅広い周波数領域の電磁波に対して優れたシー
ルド効果を有する。また、この電磁気シールド材は著し
く軽量である。従って、電磁気シールドルーム全体の重
量を軽減すると共に、構築作業の軽作業化を図ることが
可能である。また、複雑な形状の電磁気シールドカバー
も容易に製作できる。As is clear from the above examples, the electromagnetic shield material of the present invention has an excellent shielding effect against electromagnetic fields in a wide range of frequencies from a static magnetic field and a low frequency region to a high frequency region. Also, this electromagnetic shield material is extremely lightweight. Therefore, it is possible to reduce the weight of the entire electromagnetic shielded room and to lighten the construction work. Also, an electromagnetic shield cover having a complicated shape can be easily manufactured.
【図１】実験結果を示すグラフである。FIG. 1 is a graph showing experimental results.
【図２】実験方法を示すブロック図である。FIG. 2 is a block diagram showing an experimental method.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 千葉 和郎 静岡県裾野市平松85 三菱アルミニウム株 式会社技術開発センター内 (72)発明者 久米 淑夫 静岡県裾野市平松85 三菱アルミニウム株 式会社技術開発センター内 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kazuro Chiba 85 Hiramatsu, Susono City, Shizuoka Prefecture Mitsubishi Aluminum Co., Ltd.Technical Development Center (72) Inventor Yoshio Kume 85 Hiramatsu, Susono City, Shizuoka Mitsubishi Aluminum Co., Ltd. Within
Claims (2)
材料層を形成してなる電磁気シールド材。1. An electromagnetic shield material comprising a high magnetic permeability material layer formed on the surface of aluminum or an aluminum alloy.
パーマロイであることを特徴とする電磁気シールド材。2. The electromagnetic shield material according to claim 1, wherein the high magnetic permeability material is permalloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6308981A JPH08167787A (en) | 1994-12-13 | 1994-12-13 | Electromagnetic shielding material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6308981A JPH08167787A (en) | 1994-12-13 | 1994-12-13 | Electromagnetic shielding material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08167787A true JPH08167787A (en) | 1996-06-25 |
Family
ID=17987530
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6308981A Pending JPH08167787A (en) | 1994-12-13 | 1994-12-13 | Electromagnetic shielding material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08167787A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001185749A (en) * | 1999-12-27 | 2001-07-06 | Tdk Corp | Solar cell and electronic apparatus |
| WO2003059030A1 (en) * | 2002-01-08 | 2003-07-17 | 4-D Neuroimaging Oy | Wall element for magnetically shielded room and magnetically shielded room |
| KR100387603B1 (en) * | 1997-08-30 | 2003-09-19 | 주식회사 코암테크 | Low-impedance electromagnetic wave absorbing-shielding body and manufacturing method thereof |
| US7525758B2 (en) | 2005-06-30 | 2009-04-28 | Kabushiki Kaisha Toshiba | Disk drive with non-magnetic cover and base plated with conductively connected magnetic shielding layers |
| DE102014001266A1 (en) * | 2014-01-31 | 2015-08-06 | Diehl Aerospace Gmbh | Housing for electronic systems and method for its production |
| CN111500983A (en) * | 2020-04-30 | 2020-08-07 | 深圳市汉嵙新材料技术有限公司 | Aluminum alloy copper-plated base material and preparation method thereof |
| CN112911916A (en) * | 2021-01-18 | 2021-06-04 | 中铝材料应用研究院有限公司 | Aluminum alloy composite board with low electromagnetic shielding effectiveness |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0464282A (en) * | 1990-07-04 | 1992-02-28 | Toyo Commun Equip Co Ltd | Shielding case |
| JPH05235582A (en) * | 1992-02-25 | 1993-09-10 | Advantest Corp | Magnetic shielding material |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0464282A (en) * | 1990-07-04 | 1992-02-28 | Toyo Commun Equip Co Ltd | Shielding case |
| JPH05235582A (en) * | 1992-02-25 | 1993-09-10 | Advantest Corp | Magnetic shielding material |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100387603B1 (en) * | 1997-08-30 | 2003-09-19 | 주식회사 코암테크 | Low-impedance electromagnetic wave absorbing-shielding body and manufacturing method thereof |
| JP2001185749A (en) * | 1999-12-27 | 2001-07-06 | Tdk Corp | Solar cell and electronic apparatus |
| WO2003059030A1 (en) * | 2002-01-08 | 2003-07-17 | 4-D Neuroimaging Oy | Wall element for magnetically shielded room and magnetically shielded room |
| US7335838B2 (en) | 2002-01-08 | 2008-02-26 | Elekta Ab (Publ) | Wall element for magnetically shielded room and magnetically shielded room |
| EP1470746B1 (en) * | 2002-01-08 | 2013-05-22 | Elekta AB (publ) | Wall element for magnetically shielded room and magnetically shielded room |
| US7525758B2 (en) | 2005-06-30 | 2009-04-28 | Kabushiki Kaisha Toshiba | Disk drive with non-magnetic cover and base plated with conductively connected magnetic shielding layers |
| DE102014001266A1 (en) * | 2014-01-31 | 2015-08-06 | Diehl Aerospace Gmbh | Housing for electronic systems and method for its production |
| CN111500983A (en) * | 2020-04-30 | 2020-08-07 | 深圳市汉嵙新材料技术有限公司 | Aluminum alloy copper-plated base material and preparation method thereof |
| CN112911916A (en) * | 2021-01-18 | 2021-06-04 | 中铝材料应用研究院有限公司 | Aluminum alloy composite board with low electromagnetic shielding effectiveness |
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