JPH081999B2 - Transparent electromagnetic wave shield material - Google Patents
Transparent electromagnetic wave shield materialInfo
- Publication number
- JPH081999B2 JPH081999B2 JP1121477A JP12147789A JPH081999B2 JP H081999 B2 JPH081999 B2 JP H081999B2 JP 1121477 A JP1121477 A JP 1121477A JP 12147789 A JP12147789 A JP 12147789A JP H081999 B2 JPH081999 B2 JP H081999B2
- Authority
- JP
- Japan
- Prior art keywords
- mesh
- electromagnetic wave
- conductive
- transparent
- wave shielding
- 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.)
- Expired - Lifetime
Links
- 239000000463 material Substances 0.000 title claims description 48
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 5
- 239000002202 Polyethylene glycol Substances 0.000 claims description 5
- 229920001223 polyethylene glycol Polymers 0.000 claims description 5
- 239000010410 layer Substances 0.000 description 23
- 230000000694 effects Effects 0.000 description 21
- 229910052751 metal Inorganic materials 0.000 description 16
- 239000002184 metal Substances 0.000 description 16
- 230000005684 electric field Effects 0.000 description 12
- 238000002834 transmittance Methods 0.000 description 11
- 229920005989 resin Polymers 0.000 description 7
- 239000011347 resin Substances 0.000 description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 229910052802 copper Inorganic materials 0.000 description 6
- 239000010949 copper Substances 0.000 description 6
- 229910001369 Brass Inorganic materials 0.000 description 4
- 239000010951 brass Substances 0.000 description 4
- 229920002994 synthetic fiber Polymers 0.000 description 4
- 239000012209 synthetic fiber Substances 0.000 description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- SYFOAKAXGNMQAX-UHFFFAOYSA-N bis(prop-2-enyl) carbonate;2-(2-hydroxyethoxy)ethanol Chemical compound OCCOCCO.C=CCOC(=O)OCC=C SYFOAKAXGNMQAX-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 239000003999 initiator Substances 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 229920000515 polycarbonate Polymers 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 239000012780 transparent material Substances 0.000 description 2
- ZFFMLCVRJBZUDZ-UHFFFAOYSA-N 2,3-dimethylbutane Chemical group CC(C)C(C)C ZFFMLCVRJBZUDZ-UHFFFAOYSA-N 0.000 description 1
- 125000003903 2-propenyl group Chemical group [H]C([*])([H])C([H])=C([H])[H] 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 208000019901 Anxiety disease Diseases 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 238000005481 NMR spectroscopy Methods 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 229920002978 Vinylon Polymers 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 230000036506 anxiety Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000007772 electroless plating Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000012768 molten material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 150000001451 organic peroxides Chemical class 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000007870 radical polymerization initiator Substances 0.000 description 1
- 230000035807 sensation Effects 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- WKEWCYHGACEYTR-UHFFFAOYSA-N tert-butyl decaneperoxoate Chemical compound CCCCCCCCCC(=O)OOC(C)(C)C WKEWCYHGACEYTR-UHFFFAOYSA-N 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 239000011135 tin Substances 0.000 description 1
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
Landscapes
- Laminated Bodies (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は透視性電磁波シールド材に係わり、より詳細
には、優れた電磁遮蔽効果を有しながらも、優れた透視
性が維持される透視性電磁波シールド材に関する。Description: TECHNICAL FIELD The present invention relates to a transparent electromagnetic wave shielding material, and more specifically to a transparent electromagnetic wave shielding material having excellent electromagnetic shielding effect while maintaining excellent transparent property. Electromagnetic wave shielding material.
近年、核磁気共鳴診断装置、生体磁気計測器、リニア
モーターカー等、磁気を応用した装置や機械が開発さ
れ、周辺機器に影響を与えている。この為、電子機器の
ノズル防止や電磁波の人体に対する直接の影響を防止す
る等の面から電磁波シールド室等が施設されている。そ
して、透視可能な透視性電磁波シールド材は、このよう
な電磁波シールド室の物見窓、或いはOA機器のCRTフィ
ルター等として要望されている。In recent years, devices and machines that apply magnetism, such as a nuclear magnetic resonance diagnostic device, a biomagnetism measuring device, and a linear motor car, have been developed and are affecting peripheral devices. For this reason, an electromagnetic wave shield room or the like is provided from the standpoint of preventing nozzles of electronic devices and preventing direct influence of electromagnetic waves on the human body. A see-through transparent electromagnetic wave shielding material has been demanded as a sight window in such an electromagnetic wave shielding room, a CRT filter for OA equipment, or the like.
従来の透視性電磁波シールド材としては、導電性スク
リーンを用いたものや透明板に透視性に損なわない程度
に導電性材料をコーティングしたもの等があり、現在は
導電性スクリーンタイプが性能的に優れているため頻繁
に使用されている。Conventional transparent electromagnetic wave shielding materials include those using conductive screens and transparent plates coated with conductive materials to the extent that transparency is not impaired.Currently, conductive screen types are superior in performance. Because it is used frequently.
このような透視性電磁波シールド材は、通常、透明材
料内に電磁波シールド用導電性網が埋設された構造に成
っている。電磁波シールド用導電性網としては、パン
チングメタル等の多孔金属板微細なメッシュの金属ス
クリーンステンレス性のエキスパンドメタル金属コ
ーティングした繊維スクリーン等が使用されている。Such a transparent electromagnetic wave shielding material usually has a structure in which a conductive net for electromagnetic wave shielding is embedded in a transparent material. As a conductive net for electromagnetic wave shielding, a perforated metal plate such as punching metal, a fine mesh metal screen, a stainless expanded metal metal-coated fiber screen, or the like is used.
ところで、このような導電性スクリーンを用いた場
合、その線径、ピッチによって電磁遮蔽効果が変化す
る。電界シールド効果では、線径が細かく、ピッチが細
かく、開口数が多く、開口面積率が少なくなったものほ
ど高く、また、導電性スクリーンを１枚よりも２枚重ね
るほうが高くなる。By the way, when such a conductive screen is used, the electromagnetic shielding effect changes depending on its wire diameter and pitch. The electric field shielding effect is higher as the wire diameter is smaller, the pitch is smaller, the numerical aperture is larger and the opening area ratio is smaller, and it is higher when two conductive screens are stacked than one.
しかし、このような電気遮蔽効果のみを優先すると、
光線透過性が極端に犠牲になり、もはや透視板とは言え
ず、また、複数枚重ねた場合にはモアレ等が発生し、板
表面での反射損失が増す為好ましくない。However, if only such electric shielding effect is given priority,
The light transmittance is extremely sacrificed, and it cannot be said that it is a see-through plate anymore. Further, when a plurality of sheets are stacked, moire and the like occur, and reflection loss on the plate surface increases, which is not preferable.
また、医療用NMR−CT用シールドでは患者の不安を少
なくする為に、通常窓を設ける場合が多く、その場合に
は電界シールドは勿論、特に高磁界シールド性能が透視
性電磁波シールド材に要求される。高磁界シールド性能
はシールド用導電性スクリーンを更に微細にしただけで
は得られない。In addition, in the case of a medical NMR-CT shield, a window is often provided in order to reduce anxiety of the patient, and in that case, a high magnetic field shield performance is particularly required for the transparent electromagnetic wave shield material in addition to the electric field shield. It High magnetic field shielding performance cannot be obtained by simply making the conductive screen for shielding finer.
本発明の目的は、上記事情に鑑み、優れた電磁遮断効
果を有しながらも、優れた透視性が維持される透視性電
磁波シールド材を提供することにある。In view of the above-mentioned circumstances, an object of the present invention is to provide a transparent electromagnetic wave shield material which has an excellent electromagnetic shielding effect and maintains excellent transparency.
また本発明の目的は、電界シールド性能だけでなく、
高磁界シールド性能を有した透視性電磁波シールド材を
提供することである。Further, the purpose of the present invention is not only the electric field shield performance,
A transparent electromagnetic wave shield material having a high magnetic field shield performance is provided.
本発明の透視性電磁波シールド材は、上層及び下層が
透明板からなり、中間層が80乃至300メッシュで且つ網
線材の径が30乃至60μｍの範囲である細網目電磁波シー
ルド用導電性網と、50メッシュ以下或いは1cm2当たり26
00以下の開口数を有すると共に、80％以上の面積開口率
を有し、且つ網線材の径が0.1乃至0.8mmの範囲にある粗
網目電磁波シールド用導電性網と、を重ね合わせ構造と
したものであることを特徴とするものである。The transparent electromagnetic wave shielding material of the present invention is composed of a transparent plate as an upper layer and a lower layer, an intermediate layer has a mesh size of 80 to 300 mesh and a mesh wire material in the range of 30 to 60 μm, and a conductive mesh for electromagnetic shielding of fine meshes, 50 mesh or less or 26 per cm 2
Having a numerical aperture of 00 or less, an area aperture ratio of 80% or more, and a conductive mesh for a coarse mesh electromagnetic wave shield in which the diameter of the mesh wire is in the range of 0.1 to 0.8 mm, and it is a superposed structure. It is characterized by being a thing.
更に、前記上層及び下層をポリエチレングリコールビ
スアリルカーボネートにすることも特徴とするものであ
る。Further, the upper layer and the lower layer are characterized by using polyethylene glycol bisallyl carbonate.
本発明は上層及び下層の透明層に埋設される電磁波シ
ールド用導電性網に、網目の細かいものと粗いものを重
ね合わせると、前述の問題点である透視性と電磁遮蔽効
果との問題が悉く解決されるという知見に基づくもので
ある。In the present invention, when a fine mesh and a coarse mesh are superposed on a conductive net for electromagnetic wave shielding embedded in the upper layer and the lower transparent layer, the problems of the transparency and the electromagnetic shielding effect, which are the above-mentioned problems, are aggravated. It is based on the finding that it will be resolved.
網目の細かい電磁波シールド用導電性網としては、80
乃至300メッシュのピッチを有するもので、網の線材径
が20乃至100μｍ、特に30乃至60μｍのものの使用が好
ましい。上記範囲の導電性網は電磁遮蔽効果及び光線透
過率の見地から望ましく、その開口面積率は20乃至70
％、特に30乃至60％の範囲内にあることが望ましい。As a conductive mesh for electromagnetic shielding with a fine mesh, 80
It is preferable to use a mesh having a pitch of 300 to 300 mesh and a wire diameter of the mesh of 20 to 100 μm, particularly 30 to 60 μm. A conductive net in the above range is desirable from the viewpoint of electromagnetic shielding effect and light transmittance, and its opening area ratio is 20 to 70.
%, Particularly preferably in the range of 30 to 60%.
網目の粗い電磁波シールド用導電性網としては、50メ
ッシュ以下のピッチを有するもの、或いは1cm2当たり26
00個以下の開口数を有するもので、網の線材径が0.1乃
至0.8mm、特に0.1乃至0.5mmのものの使用が好ましい。As a conductive mesh for electromagnetic wave shielding with a coarse mesh, one having a pitch of 50 mesh or less, or 26 per cm 2
It is preferable to use a wire having a numerical aperture of 00 or less and a wire diameter of 0.1 to 0.8 mm, particularly 0.1 to 0.5 mm.
上記範囲のピッチ或いは開口数以下、及び網の線材径
が0.1mm以上の粗い導電性網を使用した場合は、細かい
導電性網のものと極端に異なっているため、２枚重ねた
導電性網の中間層であってもモアレが生じない。また、
粗い導電性網の線状径が0.8mm以下で網の開口面積率は8
0％以上と、高く維持されるので透視性の低下を招くこ
とが極力抑えられる。When a coarse conductive net with a pitch or numerical aperture of less than the above range and a wire material diameter of 0.1 mm or more is used, it is extremely different from that of a fine conductive net, so two conductive nets are stacked. Moire does not occur even in the intermediate layer. Also,
The coarse conductive mesh has a linear diameter of 0.8 mm or less and the mesh has an open area ratio of 8
Since it is maintained at a high value of 0% or more, it is possible to suppress deterioration of the transparency as much as possible.
網目の細かい導電性網と粗い導電性網とから構成した
中間層では、後述する実施例に示すように電界シールド
効果及び磁界シールド効果が優れたものとなる。磁界シ
ールド効果、特に高磁界シールド効果に対して、従来の
細かい導電性網のみを使用したものと比較して大きな効
果の差が認められた。また、本発明の電磁波シールド材
の可視透過率は５％程度の低下が認められたが、実際の
透視感覚では殆ど低下が感じられなかった。したがっ
て、このような構成の透視性電磁波シールド材は、磁界
シールドが必要とされる医薬用NMR−CT用室等に充分に
適用できるものである。The intermediate layer composed of a fine conductive mesh and a coarse conductive mesh has excellent electric field shielding effect and magnetic field shielding effect as shown in Examples described later. Regarding the magnetic field shield effect, especially the high magnetic field shield effect, a large difference in effect was recognized as compared with the conventional one using only a fine conductive net. The visible transmittance of the electromagnetic wave shielding material of the present invention was reduced by about 5%, but almost no reduction was observed in the actual fluoroscopic sense. Therefore, the transparent electromagnetic wave shielding material having such a configuration can be sufficiently applied to a medical NMR-CT room or the like which requires a magnetic field shield.
以下、添付図面に従って本発明に係る透視性電磁波シ
ールド材の好ましい実施例を説明する。Preferred embodiments of the transparent electromagnetic wave shield material according to the present invention will be described below with reference to the accompanying drawings.
第１図は本発明に係る透視性電磁波シールド材の断面
図である。第１図に示すように透視性電磁波シールド材
１は上層及び下層が透明板３、４で形成され、中間層は
粗網目導電性網５と細網目導電性網６とからなってい
る。このような電磁波シールド材１を構成する粗網目導
電性網５及び細網目導電性網６は、後述するように透視
性があると共に、磁界シールド及び電界シールド効果が
あるため、電磁波シールド材１は、電波暗室用窓材、電
波漏洩防止の必要性があるルームの窓材として有用され
る。以下に本発明に係る透視性電磁波シールド材の構成
材について詳説する。FIG. 1 is a sectional view of a transparent electromagnetic wave shield material according to the present invention. As shown in FIG. 1, the transparent electromagnetic wave shielding material 1 has upper and lower layers formed of transparent plates 3 and 4, and an intermediate layer includes a coarse mesh conductive mesh 5 and a fine mesh conductive mesh 6. Since the coarse mesh conductive mesh 5 and the fine mesh conductive mesh 6 which constitute the electromagnetic wave shield material 1 have the transparency and the magnetic field shield effect and the electric field shield effect as described later, the electromagnetic wave shield material 1 is It is useful as a window material for anechoic chambers and as a window material for rooms that need to prevent radio wave leakage. The constituent materials of the transparent electromagnetic wave shielding material according to the present invention will be described in detail below.
透明板３、４ 透明板は、ガラス、アクリル樹脂、塩化ビニル樹脂、ポ
リカーボネート、ポリエチレングリコールビスアリルカ
ーボネート等の可視光線透過率が80％以上、より好まし
くは90％以上の透明素材からなっている。前記範囲以外
の可視光線透過率の透明板では、成形電磁波シールド材
の透視性が悪くなり、窓材等の使用上好ましくない。Transparent Plates 3 and 4 The transparent plates are made of a transparent material such as glass, acrylic resin, vinyl chloride resin, polycarbonate, polyethylene glycol bisallyl carbonate having a visible light transmittance of 80% or more, more preferably 90% or more. If the transparent plate has a visible light transmittance outside the above range, the transparency of the molded electromagnetic wave shielding material is deteriorated, which is not preferable for use as a window material or the like.
透明板がガラス等の高温溶融物の場合には、前記導電
性網5,6を２枚のガラス板で挟んだ状態にして接着して
電磁波シールド材１が製造される。また、透明板が樹脂
の場合には、所定の型に導電性網５、６を配し、その型
内に透明樹脂を流し込むことにより、樹脂内（上層と下
層との間）に導電性網を埋設して電磁波シールド材１が
製造される。When the transparent plate is a high-temperature molten material such as glass, the conductive nets 5 and 6 are sandwiched between two glass plates and bonded to each other to manufacture the electromagnetic wave shielding material 1. When the transparent plate is made of resin, the conductive nets 5 and 6 are placed in a predetermined mold, and the transparent resin is poured into the mold, so that the conductive nets are placed in the resin (between the upper layer and the lower layer). Is embedded to manufacture the electromagnetic wave shield material 1.
また、透明板として樹脂を使用した場合、、ポリエチ
レングリコールビスアリルカーボネートを使用すること
は本発明の透視性電磁波シールド材において特に好まし
い。この場合、電磁波シールド材は、導電性網が配され
た型にジエチレングリコールビスアリルカーボネート及
びラジカル重合開始剤を含む組成物を注入し、この組成
物を加熱下に重合硬化させることにより得られるもので
ある。本発明に用いるジエチレングリコールビスアリル
カーボネートは、下記式 で表される化学構造を有する。この単量体は、ラジカル
開始剤により重合し得る２個のアリル基を有し、重合硬
化により三次元状に網状化した熱硬化型ポリカーボネー
トを形成するという特徴を有している。この特徴の故
に、本発明による成形体は本質的に無色で透明であると
いう利点を有するばかりではなく、耐熱性、耐薬品性、
耐摩耗性、耐汚染性、耐候性、耐アーク性等に本質的に
優れている。When a resin is used as the transparent plate, it is particularly preferable to use polyethylene glycol bisallyl carbonate in the transparent electromagnetic wave shielding material of the present invention. In this case, the electromagnetic wave shielding material is obtained by injecting a composition containing diethylene glycol bisallyl carbonate and a radical polymerization initiator into a mold in which a conductive net is arranged, and polymerizing and curing the composition under heating. is there. Diethylene glycol bisallyl carbonate used in the present invention has the following formula It has a chemical structure represented by This monomer has two allyl groups that can be polymerized by a radical initiator, and is characterized by forming a three-dimensional reticulated thermosetting polycarbonate by polymerization and curing. Due to this feature, the moldings according to the invention not only have the advantage of being essentially colorless and transparent, but also of heat resistance, chemical resistance,
Essentially excellent in abrasion resistance, stain resistance, weather resistance, arc resistance, etc.
ラジカル開始剤としては、ｔ−ブチルパーオキシデカ
ノエート、ジイソプロピルパーキシジカーボネート、ｔ
−ブチルパーオクトエート等の有機過酸化物が使用さ
れ、一般に単量体成分に対して１乃至５重量％の量で使
用する。このようなポリエチレングリコールビスアリル
カーボネートを用いた透視性電磁波シールド材は、後述
する細網目導電性網６等を金属メッキ合成繊維紗等にし
た場合に樹脂自体のそり、曲がり等の変形が見られず、
優れた窓材として構成されるものである。As the radical initiator, t-butyl peroxydecanoate, diisopropyl perxidicarbonate, t
Organic peroxides such as butyl peroctoate are used and are generally used in amounts of 1 to 5% by weight, based on the monomer components. Such a transparent electromagnetic wave shielding material using polyethylene glycol bisallyl carbonate shows deformation of the resin itself such as warpage and bending when the fine mesh conductive mesh 6 and the like described later are metal-plated synthetic fiber gauze and the like. No
It is constructed as an excellent window material.
本発明に用いる重合硬化性組成物には、勿論それ自体
公知の配合剤、例えば着色剤、酸化防止剤、界面活性
剤、離型剤、紫外線吸収剤等を、本発明の精神を逸脱し
ない範囲内で配合し得る。The polymerization-curable composition used in the present invention may, of course, contain a compounding agent known per se, such as a colorant, an antioxidant, a surfactant, a release agent, an ultraviolet absorber, etc. within a range not departing from the spirit of the present invention. Can be blended in.
導電性網５、６ 粗網目導電性網５は、鉄、銅、黄銅等の少なくとも１
つを主成分とする素材を用いた線材径0.1乃至0.8mm、特
に0.1乃至0.5mmの金属網、或いは鉄、銅、黄銅の少なく
とも１つを主成分とする50メッシュ以下のピッチを有す
る金属網スクリーン、或いは1cm2当たり2600個以下の開
口数を有するエキスパンドメタル等の使用が好ましい。
これ等の粗網目導電性網５は後述の細網目導電性網６を
重ねたときに、線材間のピッチ或いはメッシュ、及び線
材径が大きく相違するためモアレ等が発生しない。その
上、開口面積率が80％以上と高いので透視性の低下も最
小限に抑えることができる。Conductive mesh 5, 6 Coarse mesh conductive mesh 5 is at least 1 of iron, copper, brass, etc.
, A metal net with a diameter of 0.1 to 0.8 mm, especially 0.1 to 0.5 mm, or a metal net containing at least one of iron, copper and brass and having a pitch of 50 mesh or less. It is preferable to use a screen or an expanded metal having a numerical aperture of 2600 or less per cm 2 .
In these coarse mesh conductive nets 5, when the fine mesh conductive nets 6 to be described later are superposed, the pitch or mesh between the wire rods and the wire rod diameters are largely different from each other, so that moire or the like does not occur. In addition, since the opening area ratio is as high as 80% or more, it is possible to minimize deterioration of the transparency.
細網目導電性網６は、金属網、金属繊維網、または金
属コート合成繊維紗等の極めてメッシュが高い極細線材
からなっており、その線材径は20乃至100μｍの範囲の
もの、特に好ましくは30乃至60μｍの範囲のものであ
る。また、開口面積率は20乃至70％、より好ましくは30
乃至60％のものが良い。細網目導電性網６のメッシュは
80乃至300メッシュのピッチが好ましい。このような範
囲にある細網目導電性網６の使用により、電磁波シール
ド材は透視性を有し、前記粗網目導電性網５と組合わさ
って優れた電界シールド効果を発揮する。The fine mesh conductive mesh 6 is made of an extremely fine wire material having a very high mesh such as a metal mesh, a metal fiber mesh, or a metal-coated synthetic fiber mesh, and the diameter of the wire material is in the range of 20 to 100 μm, particularly preferably 30. To 60 μm. The opening area ratio is 20 to 70%, more preferably 30.
60% to 60% is good. The mesh of the fine mesh conductive mesh 6 is
A pitch of 80 to 300 mesh is preferred. By using the fine mesh conductive mesh 6 in such a range, the electromagnetic wave shielding material has a transparency and, in combination with the coarse mesh conductive mesh 5, exhibits an excellent electric field shielding effect.
また、細網目導電性網６の金属材質としては、銅、
錫、ステンレス、鉄、黄銅等が挙げられ、特に銅、ステ
ンレス、黄銅の単独及び複層物が好ましい。更に、細網
目導電性網６には前述のように金属コート合成繊維紗を
使用することができ、これ等の繊維紗は樹脂と組合わせ
て使用したとき、製造上、及び成形品の品質において優
れたものを提供するものである。金属コート合成繊維紗
としては、ポリエステル、ナイロン、ビニロン、アクリ
ル等のものフィラメント、マルチフィラメント糸或いは
紡績糸を、粗い織目に織成或いは編成して得られる紗織
物に、銅、ニッケル、コバルト、クロム、銀、アルミニ
ウム等の金属をメッキ層として形成したものが使用され
る。メッキ層は、複数の金属種から構成されていてもよ
く、メッキ層の形成は無電解メッキ（化学メッキ）、真
空蒸着、或いはこれ等と電気メッキを組合わせて行うこ
とができる。The metal material of the fine mesh conductive mesh 6 is copper,
Examples thereof include tin, stainless steel, iron, brass and the like, and single and multiple layers of copper, stainless steel and brass are particularly preferable. Further, as described above, the metal mesh synthetic fiber gauze can be used for the fine mesh conductive net 6, and when these fiber gauze is used in combination with a resin, in terms of production and quality of the molded product. It provides excellent things. As the metal-coated synthetic fiber gauze, polyester, nylon, vinylon, acrylic filaments, multifilament yarn or spun yarn is woven or knitted into a coarse weave to obtain a gauze fabric, and copper, nickel, cobalt, A material in which a metal such as chrome, silver or aluminum is formed as a plated layer is used. The plating layer may be composed of a plurality of metal species, and the plating layer can be formed by electroless plating (chemical plating), vacuum deposition, or a combination of these with electroplating.
以上の構成によれば、粗網目導電性網５と細網目導電
性網６を重ねて中間層とした場合、網の重ねによるモア
レは従来と異なり極端に解消されるものである。これは
粗網目導電性網５と細網目導電性網６との線径が大きく
相違すると共に、線材間のピッチが極端に相違するため
と解せられる。また、細網目導電性網６のみから成る中
間層は、電界シールド効果は充分に見られるが、磁界シ
ールド効果については高磁界で充分にシールド効果が見
られない。しかし、細網目導電性網６に粗網目導電性網
５を重ねた中間層では、後述する実施例の結果が示され
た第３図で明らかなように、高磁界シールド効果が充分
に改善されるものである。According to the above configuration, when the coarse mesh conductive mesh 5 and the fine mesh conductive mesh 6 are stacked to form an intermediate layer, moire due to the stacking of the meshes is extremely eliminated unlike the conventional case. It can be understood that this is because the wire diameters of the coarse mesh conductive mesh 5 and the fine mesh conductive mesh 6 are greatly different and the pitch between the wire materials is also extremely different. Further, the intermediate layer composed only of the fine mesh conductive net 6 has a sufficient electric field shielding effect, but does not have a sufficient magnetic field shielding effect in a high magnetic field. However, in the intermediate layer in which the coarse mesh conductive mesh 5 is superposed on the fine mesh conductive mesh 6, the high magnetic field shielding effect is sufficiently improved, as is apparent from FIG. 3 showing the results of Examples described later. It is something.
また、粗網目導電性網５を設けたとき、問題となるの
は透視性の低下である。しかし、粗網目導電性網５は細
網目導電性網６に比べて網目のピッチが広く、又は1cm2
当たりの網孔数等が少なく、開口面積率が80％以上と高
いため、透視性が極力抑えられ、光線透過率の低下は50
％であるが、目による透視感覚は殆ど変わりが見られな
かった。Further, when the coarse mesh conductive mesh 5 is provided, a problem is a decrease in transparency. However, the coarse mesh conductive mesh 5 has a wider mesh pitch than the fine mesh conductive mesh 6, or 1 cm 2
Since the number of mesh holes per contact is small and the opening area ratio is as high as 80% or more, the transparency is suppressed as much as possible and the light transmittance is reduced by 50%.
%, But there was almost no change in the fluoroscopic sensation by the eyes.
以上の様に本発明に係る透視性電磁波シールド材は、
中間層に粗網目導電性網と細網目導電性網とを配したこ
とにより、優れた電磁遮蔽効果を有し、特に、電界シー
ルド性能だけでなく高磁界シールド性能を有するもので
ある。また、透視性電磁波シールド材は、その粗網目導
電性網が極力光線透過率を下げないように構成され、透
視感覚において優れた透視性を維持するものである。As described above, the transparent electromagnetic wave shield material according to the present invention,
By arranging the coarse mesh conductive mesh and the fine mesh conductive mesh in the intermediate layer, it has an excellent electromagnetic shielding effect, and particularly has not only electric field shielding performance but also high magnetic field shielding performance. Further, the transparent electromagnetic wave shielding material is configured so that the coarse mesh conductive mesh does not lower the light transmittance as much as possible, and maintains excellent transparency in a transparent sense.
よって、本発明に係る透視性電磁波シールド材は、高
磁界シールド性能を必要とする医療用NMR−CT用シール
ドルームの窓等に設けることができる。Therefore, the transparent electromagnetic wave shielding material according to the present invention can be provided in a window or the like of a medical NMR-CT shield room that requires high magnetic field shielding performance.
以下、本発明に係る実施例を示す。尚、本発明は以下
の実施例の範囲に限られるものではない。Examples of the present invention will be shown below. The present invention is not limited to the scope of the examples below.
（実施例１） ２枚のアクリル板（肉厚3t）を上層及び下層とし、細
網目導電性網（ａ）（線径50μｍ、135メッシュの銅コ
ートポリエステルメッシュ）と粗網目導電性網（ｂ）
（厚さ又は線径0.25mm、1cm2当たりの開口数 300個、
開口面積率 90％のステンレス製エキスパンドメタル）
とを前記アクリル板の間に入れ、プレス加工によって封
止した。(Example 1) Two acrylic plates (thickness 3 t ) were used as an upper layer and a lower layer, and a fine mesh conductive mesh (a) (copper-coated polyester mesh having a wire diameter of 50 μm and 135 mesh) and a coarse mesh conductive mesh ( b)
(Thickness or wire diameter 0.25 mm, number of openings per 1 cm 2 is 300,
90% open area stainless steel expanded metal)
Were placed between the acrylic plates and sealed by pressing.
このように構成した透視性電磁波シールド材の電界及
び磁界シールド効果について調べた。この結果を第２図
及び第３図に示した。また、光線透過率についても調べ
た。The electric field and magnetic field shielding effects of the transparent electromagnetic wave shielding material thus constructed were investigated. The results are shown in FIGS. 2 and 3. The light transmittance was also examined.
光線透過率は500nmで45％であり、電界のシールド性
である減衰量は１乃至500MHzにおいて63dBで、磁界シー
ルド性の減衰量は45dB（100MHz）であった。The light transmittance was 45% at 500 nm, the amount of attenuation of the electric field shielding property was 63 dB at 1 to 500 MHz, and the amount of magnetic field shielding property was 45 dB (100 MHz).
（比較例１） 中間層に細網目導電性網６のみを使用した以外は実施
例１と同様に透視性電磁波シールド材を製造した。(Comparative Example 1) A transparent electromagnetic wave shielding material was produced in the same manner as in Example 1 except that only the fine mesh conductive mesh 6 was used for the intermediate layer.
この結果を第２図及び第３図に示した。また、光線透
過率についても調べた。The results are shown in FIGS. 2 and 3. The light transmittance was also examined.
光線透過率は500nmで50％であり、電界のシールド性
である減衰量は１乃至500MHzにおいて60dBで、磁界シー
ルド性の減衰量は30dB（100MHz）であった。The light transmittance was 50% at 500 nm, the electric field shielding property was 60 dB at 1 to 500 MHz, and the magnetic field shielding property was 30 dB (100 MHz).
第１図は本発明に係る透視性電磁波シールド材の断面
図、 第２図は透視性電磁波シールド材の各Hzでの電界シール
ド性の関係グラフ、 第３図は透視性電磁波シールド材の各Hzでの磁界シール
ド性の関係グラフである。 １……電磁波シールド材、３、４……透明板、５……粗
網目導電性網、６……細網目導電性網。FIG. 1 is a cross-sectional view of a transparent electromagnetic wave shielding material according to the present invention, FIG. 2 is a relational graph of electric field shielding characteristics of the transparent electromagnetic wave shielding material at each Hz, and FIG. 3 is each Hz of the transparent electromagnetic wave shielding material. 3 is a relational graph of magnetic field shielding property in FIG. 1 ... Electromagnetic wave shielding material, 3, 4 ... Transparent plate, 5 ... Coarse mesh conductive mesh, 6 ... Fine mesh conductive mesh.
Claims (2)
80乃至300メッシュで且つ網線材の径が30乃至60μｍの
範囲にある細網目電磁波シールド用導電性網と、50メッ
シュ以下或いは1cm2当たり2600以下の開口数を有すると
共に、80％以上の面積開口率を有し、且つ網線材の径が
0.1乃至0.8mmの範囲にある粗網目電磁波シールド用導電
性網と、を重ね合わせ構造としたものであることを特徴
とする透視性電磁波シールド材。1. An upper layer and a lower layer are transparent plates, and an intermediate layer is
Conductive net for fine mesh electromagnetic wave shield with 80 to 300 mesh and wire diameter in the range of 30 to 60 μm, and a numerical aperture of 50 mesh or less or 2600 or less per 1 cm 2, and an area opening of 80% or more And the wire diameter is
A transparent electromagnetic wave shielding material having a structure in which a coarse mesh electromagnetic wave shielding conductive net in the range of 0.1 to 0.8 mm is superposed.
ルビスアリルカーボネートであることを特徴とする請求
項（１）記載の透視性電磁波シールド材。2. The transparent electromagnetic wave shield material according to claim 1, wherein the upper layer and the lower layer are polyethylene glycol bisallyl carbonate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1121477A JPH081999B2 (en) | 1989-05-17 | 1989-05-17 | Transparent electromagnetic wave shield material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1121477A JPH081999B2 (en) | 1989-05-17 | 1989-05-17 | Transparent electromagnetic wave shield material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02302098A JPH02302098A (en) | 1990-12-14 |
| JPH081999B2 true JPH081999B2 (en) | 1996-01-10 |
Family
ID=14812124
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1121477A Expired - Lifetime JPH081999B2 (en) | 1989-05-17 | 1989-05-17 | Transparent electromagnetic wave shield material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH081999B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5539148A (en) * | 1992-09-11 | 1996-07-23 | Uniden Corporation | Electronic apparatus case having an electro-magnetic wave shielding structure |
| KR100334938B1 (en) * | 2000-07-19 | 2002-05-03 | 박호군 | Transluscent and conductive film for electric field shielding and fabrication method thereof |
| CN103079388B (en) * | 2012-12-12 | 2015-07-08 | 武汉华中电力电网技术有限公司 | Adjustable shielding net for improving power frequency electric (magnetic) field around overhead power transmission line |
| CN103052307B (en) * | 2012-12-12 | 2015-09-23 | 武汉华中电力电网技术有限公司 | Improve the adjustable shielded rack of overhead transmission line periphery power frequency electromagnetic field |
| CN103052308B (en) * | 2012-12-12 | 2015-09-23 | 武汉华中电力电网技术有限公司 | Improve overhead transmission line periphery power frequency electromagnetic field fixed shielding net |
-
1989
- 1989-05-17 JP JP1121477A patent/JPH081999B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02302098A (en) | 1990-12-14 |
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