JPH0444299A - Wave absorber - Google Patents
Wave absorberInfo
- Publication number
- JPH0444299A JPH0444299A JP14851490A JP14851490A JPH0444299A JP H0444299 A JPH0444299 A JP H0444299A JP 14851490 A JP14851490 A JP 14851490A JP 14851490 A JP14851490 A JP 14851490A JP H0444299 A JPH0444299 A JP H0444299A
- Authority
- JP
- Japan
- Prior art keywords
- wave absorber
- radio wave
- rubber
- substrate
- organic solvent
- 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
- 239000006096 absorbing agent Substances 0.000 title claims abstract description 35
- 239000011324 bead Substances 0.000 claims abstract description 29
- 229920001971 elastomer Polymers 0.000 claims abstract description 23
- 239000005060 rubber Substances 0.000 claims abstract description 23
- 239000003960 organic solvent Substances 0.000 claims abstract description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 9
- 239000010439 graphite Substances 0.000 claims abstract description 9
- 239000006229 carbon black Substances 0.000 claims abstract description 6
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 239000000758 substrate Substances 0.000 abstract description 11
- 239000000203 mixture Substances 0.000 abstract description 6
- 239000011230 binding agent Substances 0.000 abstract description 5
- 229920005989 resin Polymers 0.000 abstract description 3
- 239000011347 resin Substances 0.000 abstract description 3
- 238000001035 drying Methods 0.000 abstract description 2
- 230000015556 catabolic process Effects 0.000 abstract 1
- 238000007493 shaping process Methods 0.000 abstract 1
- 239000006260 foam Substances 0.000 description 14
- 239000002904 solvent Substances 0.000 description 8
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 4
- 239000002344 surface layer Substances 0.000 description 4
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 150000001338 aliphatic hydrocarbons Chemical class 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 229920005549 butyl rubber Polymers 0.000 description 2
- DIOQZVSQGTUSAI-UHFFFAOYSA-N decane Chemical compound CCCCCCCCCC DIOQZVSQGTUSAI-UHFFFAOYSA-N 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920006248 expandable polystyrene Polymers 0.000 description 2
- 229920003049 isoprene rubber Polymers 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920003048 styrene butadiene rubber Polymers 0.000 description 2
- VZGDMQKNWNREIO-UHFFFAOYSA-N tetrachloromethane Chemical compound ClC(Cl)(Cl)Cl VZGDMQKNWNREIO-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- VQTUBCCKSQIDNK-UHFFFAOYSA-N Isobutene Chemical group CC(C)=C VQTUBCCKSQIDNK-UHFFFAOYSA-N 0.000 description 1
- 239000002174 Styrene-butadiene Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 150000004820 halides Chemical class 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 229920000126 latex Polymers 0.000 description 1
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 1
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
Landscapes
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、電波暗室の壁面等に用いる電波吸収体に関す
る。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a radio wave absorber used for a wall surface of an anechoic chamber or the like.
一般に、電子機器の電波の漏洩の程度を測定するために
、電波暗室が広く用いられている。In general, anechoic chambers are widely used to measure the degree of radio wave leakage from electronic devices.
この電波暗室内の壁面や天井、床等には、表面に複数個
の突状（円錐状、三角錐状、模状等）の電波吸収部を設
けた電波吸収体が配されている。A radio wave absorber having a plurality of protruding (cone-shaped, triangular pyramid-shaped, model-shaped, etc.) radio wave absorbing parts provided on the surface is arranged on the walls, ceiling, floor, etc. of this anechoic chamber.
従来、このような電波吸収体は、予備発泡ポリスチレン
ビーズや予備発泡ポリエチレンビーズなどの予備発泡体
ビーズ（−次発泡体ビーズ）にカーボンブラックおよび
／又はグラファイトを配合したものから構成される。そ
して、この電波吸収体は、その裏面を接着剤等を介して
電波暗室の壁面および／又は天井等に接着することによ
り使用される。Conventionally, such radio wave absorbers are composed of pre-foamed beads (secondary foam beads) such as pre-foamed polystyrene beads and pre-foamed polyethylene beads mixed with carbon black and/or graphite. This radio wave absorber is used by adhering its back surface to the wall and/or ceiling of the radio anechoic chamber via an adhesive or the like.
しかしながら、この電波吸収体は、ビーズ間の結合が強
固でないために脆いので、外力により表層部が破壊され
易く、破壊が生しると内部のビーズやカーボンブランク
等が周囲に飛散するなどの不具合があった。このような
不具合が生じると、電波吸収性能が悪化したり、また、
作業環境が悪くなったりするなどの問題が生してしまう
。However, this radio wave absorber is fragile because the bond between the beads is not strong, so the surface layer is easily destroyed by external force, and if this happens, internal beads, carbon blanks, etc. will be scattered around. was there. If such a problem occurs, the radio wave absorption performance may deteriorate, or
This can lead to problems such as a poor working environment.
本発明は、このような事情にかんがみなされたものであ
って、上記のような不具合が生じることのない電波吸収
体を提供することを目的とする。The present invention has been made in consideration of such circumstances, and an object of the present invention is to provide a radio wave absorber that does not cause the above-mentioned problems.
本発明は、カーボンブランクおよび／又はグラファイト
と予備発泡体ビーズからなる電波吸収体の表面に、ゴム
の有機溶剤溶液を塗布してなることを特徴とする。The present invention is characterized in that an organic solvent solution of rubber is applied to the surface of a radio wave absorber made of carbon blank and/or graphite and pre-foamed beads.
このように本発明では、電波吸収体の表面にゴムの有機
溶剤溶液を塗布するため、電波吸収体の表面がゴムの皮
膜で覆われることになるので、外力による表層部の破壊
を防止することが可能となる。In this way, in the present invention, since the organic solvent solution of rubber is applied to the surface of the radio wave absorber, the surface of the radio wave absorber is covered with a rubber film, which prevents the surface layer from being destroyed by external force. becomes possible.
以下、図を参照して上記手段につき詳しく説明する。Hereinafter, the above means will be explained in detail with reference to the drawings.
第１図は本発明の電波吸収体の一例の斜視図、第２図は
その側面視説明図である。これらの図において、電波吸
収体Ｔは、基板２とその表面に配された複数個の突状の
電波吸収部１からなる。電波吸収部１は、第１図に示さ
れるように三角錐状（ピラミッド状）をしていてもよく
、また、円錐状、樹状等をしていてもよい。FIG. 1 is a perspective view of an example of the radio wave absorber of the present invention, and FIG. 2 is an explanatory side view thereof. In these figures, the radio wave absorber T consists of a substrate 2 and a plurality of protruding radio wave absorbers 1 arranged on the surface thereof. The radio wave absorber 1 may have a triangular pyramid shape as shown in FIG. 1, or may have a conical shape, a tree shape, or the like.
電波吸収部１および基板２は、それぞれ、従来の電波吸
収体におけると同様に、予備発泡ポリスチレンビーズや
予備発泡ポリエチレンビーズなどの予備発泡体ビーズ３
にカーボンブランクおよび／又はグラファイトを配合し
たものから構成される。電波吸収部ｌおよび基板２の作
製は、それぞれ、ゴム系又は樹脂系バインダーと予備発
泡体ビーズ３とカーボンブランクおよび／又はグラファ
イトとを混合し、得られる混合物を一定の形状に成形し
て乾燥させることにより行うことができる。この場合に
用いるゴム系バインダーは、例えば、ゴム−ラテックス
（ゴムと水からなる分散液）である。樹脂系バインダー
は、例えば、エポキシ樹脂、ウレタン樹脂等の合成樹脂
と水からなる分散液である。基板２に、電波吸収部１を
接着側を介して貼付することにより電波吸収体Ｔを得る
ことができる。The radio wave absorber 1 and the substrate 2 are each made of pre-foamed beads 3 such as pre-foamed polystyrene beads or pre-foamed polyethylene beads, as in conventional radio wave absorbers.
It is composed of a mixture of carbon blank and/or graphite. The radio wave absorbing part 1 and the substrate 2 are manufactured by mixing a rubber-based or resin-based binder, pre-foam beads 3, and carbon blank and/or graphite, forming the resulting mixture into a certain shape, and drying it. This can be done by The rubber binder used in this case is, for example, rubber-latex (a dispersion of rubber and water). The resin binder is, for example, a dispersion of water and a synthetic resin such as epoxy resin or urethane resin. The radio wave absorber T can be obtained by attaching the radio wave absorber 1 to the substrate 2 via the adhesive side.
本発明では、第２図に示すように、ゴムの有機溶剤溶液
４を電波吸収体Ｔの表面に塗布している。ゴムの有機溶
剤溶液４は、ゴムを有機溶剤に溶解させたものである。In the present invention, as shown in FIG. 2, a rubber organic solvent solution 4 is applied to the surface of the radio wave absorber T. The rubber organic solvent solution 4 is obtained by dissolving rubber in an organic solvent.
この場合の塗布は、電波吸収部１だけに部分的に又は全
体的に行ってもよく、また、電波吸収部１に部分的に又
は全体的に行うと共に基板２に部分的に又は全体的に行
ってもよい。なお、塗布量は必要に応して増減する。In this case, the coating may be applied only to the radio wave absorbing section 1 partially or entirely, or it may be applied partially or entirely to the radio wave absorbing section 1 and also partially or entirely to the substrate 2. You may go. Note that the amount of coating may be increased or decreased as necessary.
ゴムとしては、ブチルゴム（ＢＲ）、イソプレンゴム（
ＩＲ）、イソブチレン・イソプレンゴム（Ｉ ＩＲ）
、スチレン−ブタジェン共重合体ゴム（ＳＢＲ）などの
炭化水素系ゴムが用いられる。ゴムの使用量は、特に限
定されるものではないが、有機溶剤１００重量部に対し
て１０重量部〜７０重量部程度である。Rubbers include butyl rubber (BR) and isoprene rubber (
IR), isobutylene/isoprene rubber (I IR)
, a hydrocarbon rubber such as styrene-butadiene copolymer rubber (SBR). The amount of rubber used is not particularly limited, but is approximately 10 to 70 parts by weight per 100 parts by weight of the organic solvent.
有機溶剤は、脂肪族炭化水素系溶剤と予備発泡体ビーズ
可溶性溶剤との混合物である。脂肪族炭化水素系溶剤は
、ゴムを溶解するが電波吸収体Ｔを構成する予備発泡体
ビーズを熔解しないもので、例えば、ｎ−ヘキサン、ｎ
−ペンタン、ｎ−ブタン、ｎ−デカン、又はこれらの混
合物である。予備発泡体ビーズ可溶性溶削は、予備発泡
体ビーズを溶解するもので、例えば、ベンゼン、トルエ
ンなどの芳香族炭化水素、四塩化炭素などのハロゲン化
物、メチルエチルケトンなどである。The organic solvent is a mixture of an aliphatic hydrocarbon solvent and a prefoam bead soluble solvent. The aliphatic hydrocarbon solvent is one that dissolves the rubber but does not dissolve the pre-foamed beads constituting the radio wave absorber T, such as n-hexane, n-hexane, n-hexane, etc.
- pentane, n-butane, n-decane, or mixtures thereof. Pre-foam bead soluble melting involves dissolving the pre-foam beads, such as aromatic hydrocarbons such as benzene, toluene, halides such as carbon tetrachloride, methyl ethyl ketone, and the like.
予備発泡体ビーズ可溶性溶剤は、有機溶剤中に１０重量
％以下、好ましくは３重量％〜８重量％含有される。１
０重量％以下としたのは、この範囲内では予備発泡体ビ
ーズ可溶性溶剤が電波吸収体Ｔの表面部の予備発泡体ビ
ーズを若干溶解してビーズ同士を強く結合させることが
できるが、１０重量％を超えると多量となり過ぎて予備
発泡体ビーズの溶解が進みすぎて電波吸収体Ｔの表面部
の形部れが生じるようになるからである。The prefoam bead soluble solvent is contained in the organic solvent in an amount of 10% by weight or less, preferably 3% to 8% by weight. 1
The reason why the pre-foam bead-soluble solvent is set to 0% by weight or less is that within this range, the pre-foam bead-soluble solvent can slightly dissolve the pre-foam beads on the surface of the radio wave absorber T and strongly bond the beads together; %, the amount becomes too large and the melting of the pre-foam beads progresses too much, causing the surface portion of the radio wave absorber T to become distorted in shape.
以上説明したように本発明によれば、カーボンブラック
および／又はグラファイトと予備発泡体ビーズからなる
電波吸収体の表面にゴムの有機溶剤溶液を塗布したため
に、電波吸収体の表面がゴムの皮膜で覆われることにな
るので、外力による表層部の破壊を防止することが可能
４゜
となる。また、有機溶剤の主成分として予備発泡体ビー
ズを溶解しない脂肪族炭化水素系溶剤を用いるために、
基材のビーズには何ら悪影響を与えるものではない。さ
らに、有機ｆ４Ｅ溶液の固形分としてゴムを使用してい
るので、塗布後に電波吸収体の表面がゴムで覆われるた
め電波吸収体の表層部が柔軟となり、これによっても電
波吸収体の耐破壊性が大巾に向上する。そのうえ、有機
溶剤中に予備発泡体ビーズ可溶性溶剤が１０重量％以下
含有されているため、予備発泡体ビーズを溶解すること
なく予備発泡体ビーズ間の接着性を高めることができる
。As explained above, according to the present invention, since the organic solvent solution of rubber is applied to the surface of the radio wave absorber made of carbon black and/or graphite and pre-foam beads, the surface of the radio wave absorber is coated with a rubber film. Since it is covered, it is possible to prevent the surface layer from being damaged by external force by 4 degrees. In addition, in order to use an aliphatic hydrocarbon solvent that does not dissolve the pre-foam beads as the main component of the organic solvent,
It does not have any adverse effect on the base beads. Furthermore, since rubber is used as the solid content of the organic f4E solution, the surface of the radio wave absorber is covered with rubber after application, making the surface layer of the radio wave absorber flexible, which also improves the destruction resistance of the radio wave absorber. will improve dramatically. Moreover, since the organic solvent contains 10% by weight or less of the pre-foam bead-soluble solvent, the adhesion between the pre-foam beads can be improved without dissolving the pre-foam beads.
第１図は本発明の電波吸収体の一例の斜視図、第２図は
その側面視説明図である。
１・・・電波吸収部、２・・・基板、３・・・予備発泡
体ビーズ、４・・・ゴムの有機溶剤溶液。FIG. 1 is a perspective view of an example of the radio wave absorber of the present invention, and FIG. 2 is an explanatory side view thereof. DESCRIPTION OF SYMBOLS 1... Radio wave absorption part, 2... Substrate, 3... Pre-foam beads, 4... Rubber organic solvent solution.
Claims (1)
泡体ビーズからなる電波吸収体の表面に、ゴムの有機溶
剤溶液を塗布してなる電波吸収体。A radio wave absorber made by coating a rubber organic solvent solution on the surface of a radio wave absorber made of carbon black and/or graphite and pre-foamed beads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14851490A JPH0444299A (en) | 1990-06-08 | 1990-06-08 | Wave absorber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14851490A JPH0444299A (en) | 1990-06-08 | 1990-06-08 | Wave absorber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0444299A true JPH0444299A (en) | 1992-02-14 |
Family
ID=15454473
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14851490A Pending JPH0444299A (en) | 1990-06-08 | 1990-06-08 | Wave absorber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0444299A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5640421A (en) * | 1992-09-28 | 1997-06-17 | Sony Corporation | Modified discrete cosine transform signal transforming system |
-
1990
- 1990-06-08 JP JP14851490A patent/JPH0444299A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5640421A (en) * | 1992-09-28 | 1997-06-17 | Sony Corporation | Modified discrete cosine transform signal transforming system |
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