JPH0728155B2 - Radio wave absorber - Google Patents
Radio wave absorberInfo
- Publication number
- JPH0728155B2 JPH0728155B2 JP3050590A JP3050590A JPH0728155B2 JP H0728155 B2 JPH0728155 B2 JP H0728155B2 JP 3050590 A JP3050590 A JP 3050590A JP 3050590 A JP3050590 A JP 3050590A JP H0728155 B2 JPH0728155 B2 JP H0728155B2
- Authority
- JP
- Japan
- Prior art keywords
- organic polymer
- wave absorber
- radio wave
- conductive
- fiber
- 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
- 239000006096 absorbing agent Substances 0.000 title claims description 25
- 239000000835 fiber Substances 0.000 claims description 36
- 239000003973 paint Substances 0.000 claims description 33
- 229920000620 organic polymer Polymers 0.000 claims description 31
- 239000004816 latex Substances 0.000 claims description 10
- 229920000126 latex Polymers 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 239000011248 coating agent Substances 0.000 claims description 7
- 238000000576 coating method Methods 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 230000001070 adhesive effect Effects 0.000 claims description 4
- 239000010439 graphite Substances 0.000 claims description 4
- 229910002804 graphite Inorganic materials 0.000 claims description 4
- 239000002491 polymer binding agent Substances 0.000 claims 1
- 229920001328 Polyvinylidene chloride Polymers 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 239000005033 polyvinylidene chloride Substances 0.000 description 8
- 239000000839 emulsion Substances 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000003960 organic solvent Substances 0.000 description 3
- 229920000915 polyvinyl chloride Polymers 0.000 description 3
- 239000004800 polyvinyl chloride Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000004925 Acrylic resin Substances 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 description 2
- 235000019422 polyvinyl alcohol Nutrition 0.000 description 2
- OEPOKWHJYJXUGD-UHFFFAOYSA-N 2-(3-phenylmethoxyphenyl)-1,3-thiazole-4-carbaldehyde Chemical compound O=CC1=CSC(C=2C=C(OCC=3C=CC=CC=3)C=CC=2)=N1 OEPOKWHJYJXUGD-UHFFFAOYSA-N 0.000 description 1
- 239000005909 Kieselgur Substances 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000003618 dip coating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- 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、電波、特にマイクロ波、ミリ波、サブミリ波
等を吸収する目的に使用される電波吸収体に関するもの
である。The present invention relates to a radio wave absorber used for the purpose of absorbing radio waves, particularly microwaves, millimeter waves, submillimeter waves and the like.
従来、上記の波長帯で使用される電波吸収体として、繊
維集積体からなり、且つ該繊維集積体を構成する有機高
分子繊維の表面に導電性塗料を塗布して導電性としたマ
ット状のものが提案されている。この種の電波吸収体
は、たとえば送信アンテナとしてのパラボラアンテナの
放物面反射鏡の側面に取りつけて隣接のパラボラアンテ
ナとの干渉を防止するために使用されている。一般に、
アンテナから前方向に電波を放射した場合、回折あるい
はフィードホーン支持部での乱反射等によって放物面反
射器の後側に回りこむ電波が生じる。このような電波
は、電波エネルギーの損失となるのみならず、他の電波
と干渉し合う原因になる。この電波干渉を防止するため
に、マット状の電波吸収体によって回折波等を吸収する
ことが行われている。Conventionally, as a radio wave absorber used in the above-mentioned wavelength band, a mat-like material made of a fiber aggregate and made conductive by applying a conductive coating material to the surface of an organic polymer fiber constituting the fiber aggregate. Things have been proposed. This type of radio wave absorber is attached to the side surface of a parabolic reflector of a parabolic antenna as a transmitting antenna, for example, and is used to prevent interference with an adjacent parabolic antenna. In general,
When a radio wave is radiated forward from the antenna, a radio wave that wraps around to the rear side of the parabolic reflector is generated due to diffraction or irregular reflection at the feed horn support. Such radio waves not only cause a loss of radio energy, but also cause interference with other radio waves. In order to prevent this radio wave interference, a mat-shaped radio wave absorber is used to absorb diffracted waves and the like.
ところで従来は、マット状電波吸収体の製造において、
構成有機高分子繊維の表面への導電性塗料の接着性を良
好とするために該導電性塗料として有機溶剤希釈タイプ
のものが使用されていたが、塗布の際における有機溶剤
の揮発に基づく作業員の健康に対する悪影響や火災の危
険性等の問題があり、またその防止のための設備投資、
揮発した有機溶剤の回収の歩留まり等の経済的問題のあ
る。このために有機溶剤希釈タイプの導電性塗料に代え
て本発明者らは、先に水性導電塗料の使用を試みたが、
いずれの塗料も有機高分子繊維の表面への付着性が悪く
マット状電波吸収体を捻ったり振動を与えたりすると、
導電性塗料層が容易に剥離落下する。By the way, conventionally, in the manufacture of the mat-shaped electromagnetic wave absorber,
An organic solvent-diluted type was used as the conductive paint in order to improve the adhesion of the conductive paint to the surface of the constituent organic polymer fibers, but work based on volatilization of the organic solvent at the time of coating There are problems such as adverse effects on the health of employees and the risk of fire, and capital investment to prevent such problems,
There are economic problems such as the yield of recovery of the volatilized organic solvent. Therefore, instead of the organic solvent dilution type conductive paint, the present inventors previously tried to use an aqueous conductive paint,
All of the paints have poor adhesion to the surface of the organic polymer fiber, and when the mat-shaped electromagnetic wave absorber is twisted or vibrated,
The conductive paint layer peels off easily.
上記のような実情から本発明の目的は、水系の導電性塗
料を使用しながら、しかも有機高分子繊維の表面への導
電性層の付着性が良好なマット状電波吸収体を提供する
ことにある。From the above circumstances, an object of the present invention is to provide a mat-shaped electromagnetic wave absorber having a good adhesion of a conductive layer to the surface of an organic polymer fiber while using a water-based conductive paint. is there.
前記目的を達成するために、本発明の電波吸収体は、繊
維集積体からなり、且つ該繊維集積体を構成する有機高
分子繊維の表面に導電性塗料を塗布して導電性とした電
波吸収体において、導電性塗料として有機高分子ラテッ
クスと水性導電性塗料との混合物を用いることを特徴と
するものである。In order to achieve the above-mentioned object, the radio wave absorber of the present invention is made of a fiber aggregate, and the surface of the organic polymer fibers constituting the fiber aggregate is coated with a conductive paint to make the wave absorber conductive. In the body, a mixture of an organic polymer latex and an aqueous conductive paint is used as the conductive paint.
本発明の電波吸収体においては、導電性塗料として有機
高分子ラテックスと水性導電性塗料との混合物を用い、
これをマット状電波吸収体を構成する有機高分子繊維の
表面に塗布して導電性層を形成するので当該導電性層は
接着性が頗る良好である。従って、本発明の電波吸収体
を多少捻ったり振動を与えても導電性塗料層が剥離落下
することがなく、而して安定した電波吸収性能を長期に
わたって持続する。In the radio wave absorber of the present invention, a mixture of an organic polymer latex and a water-based conductive paint is used as the conductive paint,
This is applied to the surface of the organic polymer fiber constituting the mat-shaped electromagnetic wave absorber to form a conductive layer, so that the conductive layer has good adhesiveness. Therefore, even if the electromagnetic wave absorber of the present invention is slightly twisted or vibrated, the conductive paint layer does not peel off and fall, and stable electromagnetic wave absorption performance is maintained for a long time.
而して本発明の電波吸収体を構成する有機高分子繊維と
しては、特に制限はないが誘電率2.8以上の極性有機高
分子が好ましく、たとえばポリ塩化ビニリデン、ナイロ
ン、ポリエステル、ポリアクリル等が例示され、就中ポ
リ塩化ビニリデンが好ましい。繊維の太さは均一であっ
てもよいが、少なくとも２種の太さの異なる繊維の混合
物であったほうが好ましく、たとえば太さが0.1〜0.3mm
の細径繊維10〜90重量％と太さが0.7〜1.0mmの太径繊維
90〜10重量％との混合物はその１例である。Thus, the organic polymer fiber constituting the radio wave absorber of the present invention is not particularly limited, but a polar organic polymer having a dielectric constant of 2.8 or more is preferable, and examples thereof include polyvinylidene chloride, nylon, polyester, polyacrylic and the like. Among them, polyvinylidene chloride is preferable. The thickness of the fibers may be uniform, but it is preferable to use a mixture of at least two kinds of fibers having different thicknesses, for example, the thickness is 0.1 to 0.3 mm
10 to 90% by weight of thin fiber and 0.7 to 1.0 mm thick fiber
A mixture with 90 to 10% by weight is one example.
本発明においては、導電性塗料として有機高分子ラテッ
クスと水性導電性塗料との混合物を用いる。このうち有
機高分子ラテックスとしては、各種有機高分子のエマル
ジョンを用いることができるが、就中電波吸収体を構成
する上記有機高分子繊維に対して良好な接着作用を示す
ものが好ましい。たとえば上記繊維の構成有機高分子に
固有のsolubility Parameter（溶解度指数）に対して±
５、好ましくは±３以内のsolubility Parameterを有す
る有機高分子、更には繊維と同種の有機高分子、更には
繊維と同種の有機高分子は、一般に良好な接着作用を示
す。たとえば当該有機高分子繊維がポリ塩化ビニリデン
繊維である場合には、ポリ塩化ビニリデンのエマルジョ
ンやポリ塩化ビニリデンとポリ塩化ビニルとの混合物の
エマルジョン等が例示される。有機高分子ラテックスに
おける固形分含有量は、10〜80重量％、特には20〜70重
量％程度のものが好ましい。In the present invention, a mixture of an organic polymer latex and an aqueous conductive paint is used as the conductive paint. Among these, as the organic polymer latex, emulsions of various organic polymers can be used, but those having a good adhesive action to the above-mentioned organic polymer fibers constituting the electromagnetic wave absorber are preferable. For example, with respect to the solubility parameter (solubility index) peculiar to the constituent organic polymer of the fiber,
An organic polymer having a solubility parameter of 5, preferably within ± 3, further an organic polymer of the same kind as the fiber, and further an organic polymer of the same kind as the fiber generally show a good adhesive action. For example, when the organic polymer fiber is a polyvinylidene chloride fiber, an emulsion of polyvinylidene chloride or an emulsion of a mixture of polyvinylidene chloride and polyvinyl chloride is exemplified. The solid content of the organic polymer latex is preferably 10 to 80% by weight, particularly preferably 20 to 70% by weight.
水性導電性塗料としては、バインダーと導電性賦与剤と
を含有する水性塗料が用いられる。当該バインダーとし
ては、微粉状就中コロイド状のクレー、ベントナイト、
マイカ、珪酸塩、珪藻土等の無機バインダー、ポリビニ
ルアルコール、アクリル樹脂等の有機バインダーが例示
され、導電性賦与剤としては、たとえばグラファイト、
導電性カーボンブラック、導線性金属等が例示される。As the water-based conductive paint, a water-based paint containing a binder and a conductivity-imparting agent is used. As the binder, finely powdered colloidal clay, bentonite,
Inorganic binders such as mica, silicates and diatomaceous earth, polyvinyl alcohols, organic binders such as acrylic resins are exemplified, and examples of the conductivity imparting agent include graphite,
Examples include conductive carbon black and conductive metals.
水性導電性塗料における固形分含有量は、10〜50重量％
程度であり、その乾燥皮膜の室温における電気抵抗が膜
厚25μｍにおいて10〜50Ω/sq（□）程度であるものが
好ましい。水性導電性塗料の市販品では、日本アチソン
社のElectrodag 121、同131、同137、同141、同171、同
181、同185、同188、同230、Aquadag等が例示される。
上記有機高分子ラテックスと水性導電性塗料との混合比
率は、水性導電性塗料100重量部あたり有機高分子ラテ
ックス５〜500重量部、好ましくは10〜100重量部程度で
ある。Solid content of water-based conductive paint is 10 to 50% by weight
It is preferable that the electric resistance of the dried film at room temperature is about 10 to 50 Ω / sq (□) at a film thickness of 25 μm. Commercially available water-based conductive paints include Electrodag 121, 131, 137, 141, 171 and
181, 185, 188, 230, Aquadag and the like are exemplified.
The mixing ratio of the organic polymer latex and the aqueous conductive coating material is 5 to 500 parts by weight, preferably 10 to 100 parts by weight, per 100 parts by weight of the aqueous conductive coating material.
本発明の電波吸収体の製造には有機高分子繊維のマット
状物が原材料として用いられるが、このマット状物とし
ては、有機高分子繊維同志の交絡点が融着したもの、接
着剤により接着したもの、あるいは繊維同士が単に絡み
合いのみにて安定なマット状を呈するもの等が使用でき
る。かかる原材料につき、上記した導電性塗料を浸漬塗
装、スプレー塗装等の方法で塗装、次いで乾燥して本発
明の電波吸収体が製造される。繊維上に塗布乾燥して形
成された導電性層の厚みは、通常５〜50μｍ、好ましく
は10〜30μｍである。なお、電波吸収体の厚みは特に制
限はない。しかし一般には、最下限吸収周波数の波長の
1/2の厚みとされるが実際の使用にあたっては目的に応
じて２枚以上を重ねて使用してもよい。In the production of the electromagnetic wave absorber of the present invention, a mat-shaped material of organic polymer fibers is used as a raw material. As the mat-shaped material, a material in which the entanglement points of the organic polymer fibers are fused and bonded by an adhesive agent It is possible to use the above-mentioned ones, or those in which the fibers have a stable mat-like shape only by being entangled with each other. The raw material is coated with the above-mentioned conductive paint by a method such as dip coating or spray coating, and then dried to manufacture the radio wave absorber of the present invention. The thickness of the conductive layer formed by coating and drying on the fiber is usually 5 to 50 μm, preferably 10 to 30 μm. The thickness of the radio wave absorber is not particularly limited. However, in general, the wavelength of the lowest absorption frequency
The thickness is 1/2, but in actual use, two or more sheets may be stacked and used depending on the purpose.
以下、本発明の電波吸収体を実施例に基づいて具体的に
説明するとともに、比較例と対比して本発明の顕著な効
果をも示す。Hereinafter, the radio wave absorber of the present invention will be specifically described based on Examples, and the remarkable effects of the present invention will also be shown in comparison with Comparative Examples.
比較例 平均外径が0.1mm、0.15mm、0.2mm、0.25mm、0.3mm、0.4
mm、0.7mm、1.0mmと太さの異なる８種のポリ塩化ビニリ
デン繊維からなり、繊維の各交絡部がポリ塩化ビニリデ
ンとポリ塩化ビニルとの混合物のエマルジョン（呉羽化
学社の商品:R−14Aを使用）を接着剤として用いて接着
接合されている厚さ30mmのマット状物を原材料として用
い、一方、導電性塗料としてアクリル樹脂とグラファイ
トとを含有する水性導電性塗料（日本アチソン社のElec
trodag 188、固形分含有量:51重量％）を使用し、これ
に前記マット状原材料を浸漬し、ついで70℃で加熱乾燥
して比較例の電波吸収体を得た。Comparative example Average outer diameter 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.4
mm, 0.7 mm, 1.0 mm, 8 types of polyvinylidene chloride fibers with different thicknesses, and each interlaced part of the fiber is an emulsion of a mixture of polyvinylidene chloride and polyvinyl chloride (product of Kureha Chemical Co .: R-14A 30 mm thick mat-like material that is adhesively bonded using as an adhesive, while using an aqueous conductive paint containing acrylic resin and graphite as a conductive paint (Elec of Japan Acheson Co., Ltd.).
trodag 188 (solid content: 51% by weight) was used, and the mat-shaped raw material was dipped in this, and then heated and dried at 70 ° C. to obtain a radio wave absorber of a comparative example.
加熱乾燥後において、比較例の各繊維表面上には平均厚
さが約30μｍの導電性層が形成されていたが、該比較例
のマット状物に左右90度往復捻じりを２回加えると約80
％の導電性層が剥離落下した。After heating and drying, a conductive layer having an average thickness of about 30 μm was formed on the surface of each fiber of the comparative example. When the mat-like article of the comparative example was twisted by 90 ° left and right twice, About 80
% Of the conductive layer peeled off.
実施例１ 比較例で用いた導電性塗料に代えて、水性導電性塗料
（比較例で用いた日本アチソン社のElectrodag 188使
用）と該塗料100重量部あたり100重量部の有機高分子ラ
テックス（ポリ塩化ビニリデンとポリ塩化ビニルとの混
合物のエマルジョン、呉羽化学社の商品:R−14Aを使
用）を均一に混合したものを使用した以外は前記比較例
と同様に処理して実施例１の電波吸収体を得た。Example 1 Instead of the conductive paint used in the comparative example, an aqueous conductive paint (using Electrodag 188 of Japan Acheson used in the comparative example) and 100 parts by weight of an organic polymer latex (polyester) were used per 100 parts by weight of the paint. Radio wave absorption of Example 1 was performed in the same manner as in Comparative Example 1 except that an emulsion of a mixture of vinylidene chloride and polyvinyl chloride, which was a product of Kureha Chemical Co., Ltd .: R-14A was uniformly mixed, was used. Got the body
加熱乾燥後において、本実施例の各繊維表面上には平均
厚さが約30μｍの導電性層が形成されていたが、該実施
例のマット状物に左右90度往復捻じりを10回加えても導
電性層は剥離落下しなかった。After heating and drying, a conductive layer having an average thickness of about 30 μm was formed on the surface of each fiber in this example. The mat-like article of this example was twisted 90 degrees left and right, and then twisted 10 times. However, the conductive layer did not peel off.
実施例２ 実施例１で用いた導電性塗料に代えて、水性導電性塗料
（ポリビニルアルコールとグラファイトとを含有する日
本アチソン社のElectrodag 185使用）と該塗料100重量
部あたり100重量部の有機高分子ラテックス（ポリ塩化
ビニリデンのエマルジョン）を均一に混合したものを使
用した以外は前記実施例１と同様に処理して実施例２の
電波吸収体を得た。加熱乾燥後において、本実施例の各
繊維表面上には平均厚さが約35μｍの導電性層が形成さ
れていたが、該実施例のマット状物に左右90度往復捻じ
りを８回加えても導電性層は剥離落下しなかった。Example 2 Instead of the conductive paint used in Example 1, a water-based conductive paint (using Electrodag 185 of Nippon Acheson Co. containing polyvinyl alcohol and graphite) and 100 parts by weight of organic paint per 100 parts by weight of the paint were used. A radio wave absorber of Example 2 was obtained by the same procedure as in Example 1 except that a uniform mixture of molecular latex (polyvinylidene chloride emulsion) was used. After heating and drying, a conductive layer having an average thickness of about 35 μm was formed on the surface of each fiber of this example. However, the conductive layer did not peel off.
本発明の電波吸収体は、それを構成する各有機高分子繊
維の表面に形成された導電性塗料層は、接着性が良好で
あるので多少捻ったり振動を与えても導電性塗料層が剥
離落下することがなく、而して安定した電波吸収性能を
長期にわたって持続する優れた効果を有している。In the electromagnetic wave absorber of the present invention, the conductive paint layer formed on the surface of each organic polymer fiber constituting the same has good adhesiveness, and therefore the conductive paint layer is peeled off even if a little twist or vibration is applied. It does not drop, and has an excellent effect of maintaining stable electromagnetic wave absorption performance for a long period of time.
Claims (2)
構成する有機高分子繊維の表面に導電性塗料を塗布して
導電性とした電波吸収体において、導電性塗料として有
機高分子ラテックスと水性導電性塗料との混合物を用い
ることを特徴とする電波吸収体。1. A radio wave absorber made of a fiber assembly and made conductive by applying a conductive coating to the surface of an organic polymer fiber constituting the fiber assembly, wherein an organic polymer latex is used as the conductive coating. A radio wave absorber characterized by using a mixture of a water-based conductive paint and water.
上の極性有機高分子であり、有機高分子ラテックスが当
該極性有機高分子に対して良好な接着作用を示すもので
あり、また水性導電性塗料が有機高分子バインダーとグ
ラファイトと含有するものである第１請求項に記載の電
波吸収体。2. The fiber constituting the fiber assembly is a polar organic polymer having a dielectric constant of 2.8 or more, and the organic polymer latex has a good adhesive action to the polar organic polymer, and is water-based. The radio wave absorber according to claim 1, wherein the conductive paint contains an organic polymer binder and graphite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3050590A JPH0728155B2 (en) | 1990-02-09 | 1990-02-09 | Radio wave absorber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3050590A JPH0728155B2 (en) | 1990-02-09 | 1990-02-09 | Radio wave absorber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03234092A JPH03234092A (en) | 1991-10-18 |
| JPH0728155B2 true JPH0728155B2 (en) | 1995-03-29 |
Family
ID=12305675
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3050590A Expired - Lifetime JPH0728155B2 (en) | 1990-02-09 | 1990-02-09 | Radio wave absorber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0728155B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6329402U (en) * | 1986-08-11 | 1988-02-26 |
-
1990
- 1990-02-09 JP JP3050590A patent/JPH0728155B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6329402U (en) * | 1986-08-11 | 1988-02-26 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03234092A (en) | 1991-10-18 |
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