JP4581124B2 - Electromagnetic wave absorption and sound insulation structure on the road - Google Patents

Electromagnetic wave absorption and sound insulation structure on the road Download PDF

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JP4581124B2
JP4581124B2 JP2004319891A JP2004319891A JP4581124B2 JP 4581124 B2 JP4581124 B2 JP 4581124B2 JP 2004319891 A JP2004319891 A JP 2004319891A JP 2004319891 A JP2004319891 A JP 2004319891A JP 4581124 B2 JP4581124 B2 JP 4581124B2
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electromagnetic wave
absorbing
wave absorber
sound
absorption
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JP2006132115A (en
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誠 豊田
直文 板野
剛史 山田
一郎 岩谷
春雄 桃園
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Nihon Tokushu Toryo Co Ltd
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Description

本発明は、道路における電磁波吸収・吸遮音構造体に関し、特に、高速道路の料金所付近における電磁波吸収・吸遮音構造体に関するものである。 The present invention relates to an electromagnetic wave absorption / sound absorption / insulation structure on a road, and more particularly to an electromagnetic wave absorption / sound absorption / sound insulation structure in the vicinity of a toll booth on an expressway.

高速道路の渋滞緩和に役立つ新システムとして、ETC(料金自動徴収システム)が実用化され、徐々にその採用の動きが広まっている。
このシステムが試験運用を開始された当初、使用する5.8GHzの周波数の電磁波が乱反射して、自動車と料金所との間でうまく通信できずに、料金の課金ができないという不具合が指摘されていた。
そこで、電磁波乱反射の対策として、電磁波吸収材料を料金所壁面に施工することにより、乱反射を防止する対策が取られた。しかし、十分な電磁波吸収機能を有する材料は、その厚さが50mmを超え、スペ−スに余裕の無い場所への施工が困難であった。
そこで、厚さが薄く、電磁波吸収機能を有するシ−ト状材料も開発されているが、厚さが薄くなると、電磁波の斜入射特性(0〜55°)が悪くなり、薄いシ−ト状材料のみで必要な電磁波吸収工事を行うことは困難であった。そこで、50mm以下のできる限り薄いシ−ト状材料であって、しかも斜入射特性も優れた電磁波吸収シ−トが本出願人により開発され、特願2002−133864号(特開2003−332782号公報)として特許出願されている。
しかしながら、電磁波吸収シ−トには、吸音性能、すなわち騒音低減効果はなく、従来設置されていた吸遮音性能を有する防音壁を取り外し、電磁波吸収シ−トを設置した場合、騒音が増大してしまう。そこで、既存の防音壁を取り外しせずに、既存の防音壁を生かして、なお電磁波吸収シ−トを設置しても、防音壁による防音効果を劣化させずに、しかも、優れた電磁波吸収能を発揮できる技術の開発が望まれている。
しかも、その際に、当該電磁波吸収シ−トとして特定比率範囲の開孔率のものを使用すれば、優れた電磁波吸収能を発揮できることが本出願人により判明しており、特願2002−297486号(特開2004−134571号公報)として特許出願されているが、上記のような既存の防音壁を取り外しせずに電磁波吸収シ−トを設置するという態様において、どのような施工をすれば電磁波吸収能を発揮できるのか、また、防音壁にル−バ−が設けられている場合には、どのような態様で電磁波吸収シ−トを設置すればよいのかなどが問題となる。
特開2003−332782号公報、特開2004−134571号公報
ETC (automatic toll collection system) has been put into practical use as a new system that helps reduce congestion on highways, and its adoption is gradually spreading.
At the beginning of the test operation of this system, it was pointed out that the electromagnetic wave of the frequency of 5.8 GHz used was irregularly reflected, and communication between the car and the toll gate could not be performed well, and the charge could not be charged. It was.
Therefore, as a measure against the irregular reflection of electromagnetic waves, measures were taken to prevent irregular reflection by constructing an electromagnetic wave absorbing material on the toll wall. However, a material having a sufficient electromagnetic wave absorbing function has a thickness exceeding 50 mm, and it has been difficult to construct in a place where there is not enough space.
Therefore, a sheet-like material having a thin thickness and having an electromagnetic wave absorbing function has been developed. However, when the thickness is reduced, the oblique incidence characteristic (0 to 55 °) of the electromagnetic wave is deteriorated, and the sheet is thin. It was difficult to carry out the necessary electromagnetic wave absorption work using only materials. Therefore, an electromagnetic wave absorbing sheet having a sheet-like material as thin as 50 mm or less and having an excellent oblique incidence characteristic has been developed by the present applicant, and Japanese Patent Application No. 2002-133864 (Japanese Patent Application Laid-Open No. 2003-332882). A patent application has been filed as Gazette.
However, the electromagnetic wave absorbing sheet has no sound absorbing performance, that is, no noise reduction effect. When the sound absorbing wall having the sound absorbing and insulating performance previously installed is removed and the electromagnetic wave absorbing sheet is installed, the noise increases. End up. Therefore, even if the existing soundproof wall is used without removing the existing soundproof wall and an electromagnetic wave absorbing sheet is installed, the soundproofing effect of the soundproof wall is not deteriorated, and it has excellent electromagnetic wave absorbing ability. Development of technology that can demonstrate this is desired.
In addition, it has been found by the present applicant that an excellent electromagnetic wave absorbing ability can be exhibited by using an electromagnetic wave absorbing sheet having an aperture ratio in a specific ratio range at that time, and Japanese Patent Application No. 2002-297486. No. (Japanese Patent Laid-Open No. 2004-134571), but what kind of construction should be performed in an aspect in which an electromagnetic wave absorbing sheet is installed without removing the existing soundproof wall as described above? The problem is whether the electromagnetic wave absorbing ability can be exhibited and in what manner the electromagnetic wave absorbing sheet should be installed if a sound barrier is provided with a louver.
JP 2003-332882 A, JP 2004-134571 A

本発明は、上記要請に答えることの出来る技術を提供することを目的としたものである。
本発明の他の目的や新規な特徴については本件明細書及び図面の記載からも明らかになるであろう。
The object of the present invention is to provide a technique capable of answering the above request.
Other objects and novel features of the present invention will become apparent from the description of the present specification and the drawings.

本発明の特許請求の範囲は、次の通りである。
(請求項1) 道路脇に設置されている防音部の支持体に電磁波吸収体設置用取付部材を取付け、当該取付部材に開孔率10〜65%の孔を有する厚さ10mm以下の電磁波吸収体を設置し、当該取付部材同士が隣り合った空間に孔の開けていない電磁波吸収体を設置して、防音部の支持体を覆い隠してなることを特徴とする道路における電磁波吸収・吸遮音構造体。
(請求項2)電磁波吸収体と防音部との間の間隔を3〜30mmとしてなることを特徴とする、請求項1に記載の道路における電磁波吸収・吸遮音構造体。
(請求項3) 電磁波吸収体と防音部との間に、吸音性を有する衝撃緩衝部材を挿入してなることを特徴とする、請求項1に記載の道路における電磁波吸収・吸遮音構造体。
(請求項4) 電磁波吸収体は、防音部のル−バ−に略一致させる位置に孔を開けてなることを特徴とする、請求項1に記載の道路における電磁波吸収・吸遮音構造体。
The claims of the present invention are as follows.
(Claim 1) A mounting member for installing an electromagnetic wave absorber is attached to a support member of a soundproof part installed on the side of a road, and the electromagnetic wave absorption is 10 mm or less having a hole with a porosity of 10 to 65%. Electromagnetic wave absorption / sound absorption / sound insulation on a road, characterized in that a body is installed, an electromagnetic wave absorber that is not perforated is installed in a space where the mounting members are adjacent to each other, and a support for a soundproof part is covered Structure.
(Claim 2) The electromagnetic wave absorption / sound absorption / sound insulation structure for a road according to claim 1, wherein a distance between the electromagnetic wave absorber and the soundproofing part is 3 to 30 mm.
(Claim 3) The road electromagnetic wave absorbing / absorbing and sound insulating structure according to claim 1, wherein a shock absorbing member having a sound absorbing property is inserted between the electromagnetic wave absorber and the soundproofing part.
(Claim 4) The electromagnetic wave absorption / sound absorption / sound insulation structure for a road according to claim 1, wherein the electromagnetic wave absorber is formed with a hole at a position substantially coinciding with the louver of the soundproofing part.

本発明によれば、道路脇に設置されている防音部の支持体に電磁波吸収体設置用取付部材を取付け、当該取付部材に開孔率10〜65%の孔を有する厚さ10mm以下の電磁波吸収体を設置し、当該取付部材同士が隣り合った空間に孔の開けていない電磁波吸収体を設置して、防音部の支持体を覆い隠してなることにより、従来騒音低減のための防音工事が実施されていた防音壁部分を生かして、電磁波吸収特性を長期間にわたり維持することができ、当該電磁波吸収体は、10.0mm以下の厚さという薄物であるため容易に施工が可能で、又、従来騒音低減のための防音工事が実施されていた防音壁部に当該電磁波吸収体を設置しても、その騒音防止機能を何ら損なうことなく、電磁波吸収特性を奏することができる。
本発明によれば、ETC設置場所での電磁波乱反射対策のみならず、今後研究開発、実用化が促進されていくと思われるITS−DSRC(交通情報システム−専用狭帯域通信)の電磁波受発信エリアにおいても、乱反射防止対策等に有効に活用でき、今後展開される自動車−道路間通信のための乱反射防止対策に極めて有効である。
According to the present invention, an electromagnetic wave absorber installation mounting member is attached to a support of a soundproofing part installed beside a road, and an electromagnetic wave having a thickness of 10 mm or less having a hole with a porosity of 10 to 65% in the mounting member. By installing an absorber and installing an electromagnetic wave absorber that is not perforated in the space where the mounting members are adjacent to each other and covering the support of the soundproofing part , soundproofing work to reduce noise conventionally By utilizing the soundproof wall portion that has been implemented, the electromagnetic wave absorption characteristics can be maintained over a long period of time, and the electromagnetic wave absorber can be easily constructed because it is a thin object having a thickness of 10.0 mm or less, Moreover, even if the electromagnetic wave absorber is installed on the soundproof wall portion where the soundproofing work for noise reduction has been conventionally performed, the electromagnetic wave absorption characteristics can be achieved without impairing the noise prevention function.
According to the present invention, electromagnetic wave reflection / transmission area of ITS-DSRC (traffic information system-dedicated narrowband communication), which is expected to be promoted not only for electromagnetic wave reflection at the ETC installation location but also in future research and development and practical application. Can be effectively used for preventing irregular reflection and the like, and is extremely effective for preventing irregular reflection for future automobile-road communication.

次に、本発明の実施例を図面に基づいて説明する。   Next, embodiments of the present invention will be described with reference to the drawings.

図9に示すように、高速道路の料金所の道路脇には、防音部1が左右に設置されており、当該防音部1は、その一例として、吸音性材料100を金属板等の適当なケ−ス101に収納したものが例示できる。
当該吸音性材料100としては、例えば、グラスウ−ル(ガラス繊維)、ロックウ−ル等の無機・鉱物繊維、麻・綿・毛、絹等の天然繊維又はアクリル・ナイロン・ビニロン・レ−ヨン等の各種の化学繊維の単独若しくは混合物を、ニ−ドルパンチング加工若しくは適当なバインダ−により当該繊維同士をフェルト状に固めたものが例示できる。
当該防音部1には、ル−バ−(水平方向の庇付きスリット状開口部)102が設けられている。当該ル−バ−102により、空気がその開口部より上記吸音材料100に流通するようになっている。
図5は、当該防音部1をそのル−バ−102側から見た正面図で、ケ−ス101の内部には、複数の当該ル−バ−102が縦横に配列されている。
As shown in FIG. 9, soundproofing parts 1 are installed on the left and right sides of the toll road of the expressway, and the soundproofing part 1 uses a sound absorbing material 100 as an example such as a metal plate as an example. What was accommodated in the case 101 can be illustrated.
Examples of the sound-absorbing material 100 include inorganic fibers and mineral fibers such as glass wool (glass fiber) and rock wool, natural fibers such as hemp, cotton, wool, and silk, acrylic, nylon, vinylon, rayon, and the like. Examples of the above-mentioned various chemical fibers alone or a mixture thereof include those obtained by solidifying the fibers in a felt shape by needle punching or an appropriate binder.
The soundproof unit 1 is provided with a louver (horizontal slitted opening) 102. By means of the louver 102, air flows from the opening to the sound absorbing material 100.
FIG. 5 is a front view of the soundproofing unit 1 as viewed from the side of the louver 102. In the case 101, a plurality of the louvers 102 are arranged vertically and horizontally.

図9に示すように、当該既設の防音部1に、電磁波吸収体2を設置する。
当該電磁波吸収体2は、例えば、図9に示すように、シ−ト状からなる。
当該電磁波吸収体2は、例えば、電磁波吸収層200と金属反射層201との2層から構成される。
当該電磁波吸収層200は、例えば、バインダ−樹脂に対して、特定の磁性材料及び誘電材料を必須成分としたもので構成される。
As shown in FIG. 9, an electromagnetic wave absorber 2 is installed in the existing soundproof unit 1.
The electromagnetic wave absorber 2 has, for example, a sheet shape as shown in FIG.
The electromagnetic wave absorber 2 includes, for example, two layers of an electromagnetic wave absorption layer 200 and a metal reflection layer 201.
The electromagnetic wave absorbing layer 200 is made of, for example, a specific magnetic material and dielectric material as essential components with respect to a binder resin.

当該バインダ−樹脂としては、バインダ−樹脂そのものが電磁波吸収に寄与することはないため、基本的にはいかなる熱可塑性樹脂、熱硬化性樹脂またはこれらの併用系であってもかまわない。しかし、バインダ−樹脂による特性が、磁性材料、誘電材料による誘電率、透磁率に対して影響を与えてしまうことは避けた方がよいので、磁性材料や誘電材料に対してできるだけ中立な物性を有するものが好ましい。例えば、塩化ビニル樹脂、エチレン−酢酸ビニル共重合体樹脂、フェノ−ル樹脂、ポリウレタン樹脂、エポキシ樹脂、アクリル樹脂、アルキッド樹脂、フッ素樹脂等が例示できるが、特に天然ゴム、ブチルゴム、クロロプレンゴム、スチレン−ブタジエンゴム、アクリルニトリル−ブタジエンゴム、ブチルゴム等の各種の合成ゴム、液状ゴム、天然アスファルト、ストレ−トアスファルト、ブロ−ンアスファルト、セミブロ−ンアスファルト、ゴム変性アスファルト等の石油アスファルトが好ましく使用できる。
当該バインダ−樹脂は5〜60質量%、特に好ましくは10〜40質量%含有することが望ましく、5質量%未満であると磁性材料、誘電材料の均一な分散が困難であり、60質量%を超えて配合すると所望の誘電率、透磁率が得られない虞れがある。
As the binder resin, since the binder resin itself does not contribute to electromagnetic wave absorption, it may be basically any thermoplastic resin, thermosetting resin, or a combination thereof. However, it is better to avoid the properties of the binder resin from affecting the dielectric constant and magnetic permeability of the magnetic material and dielectric material. What has is preferable. For example, vinyl chloride resin, ethylene-vinyl acetate copolymer resin, phenol resin, polyurethane resin, epoxy resin, acrylic resin, alkyd resin, fluororesin, etc. can be exemplified, especially natural rubber, butyl rubber, chloroprene rubber, styrene. -Various synthetic rubbers such as butadiene rubber, acrylonitrile-butadiene rubber, butyl rubber, etc., petroleum asphalt such as liquid rubber, natural asphalt, straight asphalt, blown asphalt, semi-bron asphalt, rubber modified asphalt can be preferably used. .
The binder resin is preferably contained in an amount of 5 to 60% by mass, particularly preferably 10 to 40% by mass, and if it is less than 5% by mass, it is difficult to uniformly disperse the magnetic material and dielectric material. When it mixes exceeding it, there exists a possibility that a desired dielectric constant and magnetic permeability may not be obtained.

当該磁性材料としては、材質的にはニッケル亜鉛系、マンガン亜鉛系等のフェライト類、結晶分類からは、M型六方晶型フェライト(バリウムフェライト、ストロンチウムフェライト)、ガ−ネット型フェライト(希土類鉄ガ−ネット)、スピネル型フェライトなどのフェライト類、また、カルボニル鉄粉、アトマイズ鉄粉、還元鉄粉などの鉄粉類が例示できる。
これらの磁性材料は、20〜90質量%、より好ましくは40〜80質量%含有することが望ましい。20質量%未満の場合には必要な電磁波吸収特性が得られず、90質量%を超えた場合にはシ−ト形状への成形が困難となる。
The magnetic materials include nickel zinc-based and manganese zinc-based ferrites. From the crystal classification, M-type hexagonal ferrite (barium ferrite, strontium ferrite), garnet-type ferrite (rare earth iron gallium). -Net), ferrites such as spinel type ferrite, and iron powders such as carbonyl iron powder, atomized iron powder, and reduced iron powder.
These magnetic materials are preferably contained in an amount of 20 to 90% by mass, more preferably 40 to 80% by mass. If it is less than 20% by mass, the required electromagnetic wave absorption characteristics cannot be obtained, and if it exceeds 90% by mass, it becomes difficult to form a sheet.

当該誘電材料としては、粒状、繊維状、フェルト状のカ−ボン、酸化チタン、酸化亜鉛が例示できる。
これらの誘電材料は、0.5〜20質量%、より好ましくは1〜15質量%含有することが望ましい。0.5質量%未満、及び20質量%を超えた場合には、電磁波吸収特性が得られない。
Examples of the dielectric material include granular, fibrous, and felt carbon, titanium oxide, and zinc oxide.
These dielectric materials are desirably contained in an amount of 0.5 to 20% by mass, more preferably 1 to 15% by mass. When the amount is less than 0.5% by mass and exceeds 20% by mass, electromagnetic wave absorption characteristics cannot be obtained.

当該電磁波吸収層200は、例えば、磁性材料、誘電材料を、液状化したバインダ−樹脂に混合分散し、均一化することにより得ることができる。当該混合分散には、加圧ニ−ダ−、バンバリ−ミキサ−、アトライタ−等の混合分散機を使用することができる。使用するバインダ−樹脂によっては、常温では固体であるものもあるため、その場合には加熱ができる分散機の使用が好ましい。均一に混合された材料を、カレンダ−ロ−ル等の加工機を使用して、一定厚さのシ−ト状物に加工する。この時、金属反射層とのト−タルの厚さが10.0mm以下となるように厚さを設定する必要がある。   The electromagnetic wave absorbing layer 200 can be obtained, for example, by mixing and dispersing a magnetic material or a dielectric material in a liquefied binder-resin and making it uniform. For the mixing / dispersing, a mixing / dispersing machine such as a pressure kneader, a Banbury mixer, an attritor or the like can be used. Some binder resins are solid at room temperature. In that case, it is preferable to use a disperser capable of heating. The uniformly mixed material is processed into a sheet having a constant thickness using a processing machine such as a calender roll. At this time, it is necessary to set the thickness so that the total thickness of the metal reflection layer is 10.0 mm or less.

本発明で使用する電磁波吸収体2を構成する金属反射層201には、鉄、銅、アルミニウム、亜鉛、鉛等の金属、あるいはこれらの金属の合金類、例えばジュラルミン、ステンレス、トタンなど、若しくは金属表面にメッキ処理、ラミネ−ト処理、コ−ティングをしたものなどが使用できる。   The metal reflection layer 201 constituting the electromagnetic wave absorber 2 used in the present invention includes a metal such as iron, copper, aluminum, zinc, lead, or an alloy of these metals, such as duralumin, stainless steel, tin, or the like. The surface can be plated, laminated, or coated.

本発明で使用する電磁波吸収体2は、電磁波吸収層200と金属反射層201とを有することが必須であるが、更に要すれば、図9に示すように、電磁波吸収層200と金属反射層201と保護層202とからなる3層構造のものとしてもよく、当該電磁波吸収体2の電磁波吸収層200の表面を保護することなどから当該保護層202を有するようにしてもよい。
すなわち、本発明で使用される当該電磁波吸収体2は、その機能を発揮させる場所として、例えば高速道路の料金所と言った場所が考えられるので、この様な場所は、雨、風によるホコリの堆積などの他、自動車の減速、加速にともなう排気ガスによる汚染が激しく、短期間でその表面が汚染されてしまい、この表面の汚染は容易に除去することが困難と考えられる。そこで、電磁波吸収体2の表面を保護し、任意の色調に着色が可能な化粧保護層202を積層することが好ましい。化粧保護層202に求められる物性としては、電磁波吸収のための性質を減衰させないことは当然であるが、他にも耐候性、耐水性、耐汚れ性等が求められ、仮に汚染されても容易に洗浄が可能な材料であることが望まれる。これらの条件を満たすものとして、アクリル系の各種樹脂による板状体、これらの樹脂としては、例えば、AAS(アクリルニトリルアクリレ−トスチレン)、AS(アクリルニトリルスチレン)、ACS(アクリルニトリル塩素化ポリエチレンスチレン)、とくに好ましくはABS(アクリルニトリルブタジエンスチレン)、AES(アクリルニトリルエチレンスチレン)、あるいはポリカ−ボネ−トが例示できる。
当該保護層202の厚さは、一定厚さを超えると電磁波吸収層200の電磁波吸収能を低下させる虞れがあり、3mm未満であることが望ましい。更に好ましくは2mm以下であればよく、上記の化粧保護機能を長期にわたり保持できるのであれば、薄ければ薄いほどよい。
The electromagnetic wave absorber 2 used in the present invention must have the electromagnetic wave absorption layer 200 and the metal reflection layer 201, but if necessary, as shown in FIG. 9, the electromagnetic wave absorption layer 200 and the metal reflection layer. The protective layer 202 may have a three-layer structure, and the protective layer 202 may be provided to protect the surface of the electromagnetic wave absorbing layer 200 of the electromagnetic wave absorber 2.
That is, the electromagnetic wave absorber 2 used in the present invention can be considered as a place called a toll gate on an expressway, for example, as a place where its function is exhibited. In addition to deposition, etc., the exhaust gas accompanying the deceleration and acceleration of the automobile is severely contaminated, and the surface is contaminated in a short period of time. It is considered difficult to easily remove this surface contamination. Therefore, it is preferable to laminate a cosmetic protective layer 202 that protects the surface of the electromagnetic wave absorber 2 and can be colored in an arbitrary color tone. Naturally, the physical properties required for the decorative protective layer 202 are not to attenuate the properties for absorbing electromagnetic waves, but other properties such as weather resistance, water resistance, and dirt resistance are required, and even if it is contaminated, it is easy to do. It is desirable that the material be washable. In order to satisfy these conditions, plate-like bodies made of various acrylic resins, such as AAS (acrylonitrile acrylate styrene), AS (acrylonitrile styrene), ACS (acrylonitrile chlorinated polyethylene) Styrene), particularly preferably ABS (acrylonitrile butadiene styrene), AES (acrylonitrile ethylene styrene), or polycarbonate.
If the thickness of the protective layer 202 exceeds a certain thickness, the electromagnetic wave absorbing ability of the electromagnetic wave absorbing layer 200 may be reduced, and it is desirable that the thickness is less than 3 mm. More preferably, the thickness should be 2 mm or less, and the thinner the better, as long as the above-described cosmetic protection function can be maintained over a long period of time.

上記の電磁波吸収体2の形成に際しては、金属反射層201と電磁波吸収層200との間、また、化粧保護層202を更に設ける場合には、電磁波吸収層200と化粧保護層202との間は、密着させて積層してあれば良く、密着固定一体化させる方法に関しては、従来公知のいかなる方法であっても良い。但し、密着させることにより、所望の電磁波吸収性能を発揮できるためには、当該層間に0.1mm以上の空気層等の隙間ができてしまう様な方法は好ましくない。   When forming the electromagnetic wave absorber 2 described above, between the metal reflective layer 201 and the electromagnetic wave absorbing layer 200, and when further providing a cosmetic protective layer 202, between the electromagnetic wave absorbing layer 200 and the cosmetic protective layer 202, Any method known in the art may be used as long as they are laminated in close contact with each other, and the method for tightly fixing and integrating them may be any conventionally known method. However, a method in which a gap such as an air layer of 0.1 mm or more is formed between the layers is not preferable in order that the desired electromagnetic wave absorbing performance can be exhibited by the close contact.

図6は、上記の電磁波吸収体2の正面図で、当該図6及び図9に示すように、当該電磁波吸収体2には、特定比率の開孔部203を設ける。
当該開孔の比率を示す開孔率は、10〜65%であることが必要である。当該開孔率が、10%未満であると、防音部1における吸音性材料100への空気流通が不充分であり、必要な吸音効果、すなわち騒音低減効果が得られない虞れがある。一方、当該開孔率が65%を超えると、電磁波吸収体2の面積が本来の45%を切ってしまい、所定の電磁波吸収性能が顕現されない虞れがある。
当該開孔率は、電磁波吸収体2の表面における開孔部の面積/電磁波吸収体2の表面における開孔部と開孔していない部分との合計面積との百分率で算出される。
FIG. 6 is a front view of the electromagnetic wave absorber 2 described above. As shown in FIGS. 6 and 9, the electromagnetic wave absorber 2 is provided with apertures 203 having a specific ratio.
The aperture ratio indicating the ratio of the apertures needs to be 10 to 65%. If the aperture ratio is less than 10%, air circulation to the sound-absorbing material 100 in the soundproofing part 1 is insufficient, and a necessary sound absorption effect, that is, a noise reduction effect may not be obtained. On the other hand, when the open area ratio exceeds 65%, the area of the electromagnetic wave absorber 2 cuts the original 45%, and the predetermined electromagnetic wave absorption performance may not be manifested.
The aperture ratio is calculated as a percentage of the area of the aperture portion on the surface of the electromagnetic wave absorber 2 / the total area of the aperture portion and the non-perforated portion on the surface of the electromagnetic wave absorber 2.

開孔率が10〜65%であれば、個々の孔の面積、形状、配置及び間隔等には特に制限はない。孔を開ける方法に関しても、従来公知のいかなる方法であってもよく、特に制限はない。
ただし、電磁波吸収層200に化粧保護層202を積層している場合、両層に開ける孔の面積、形状、配置、間隔は略同一であることが必要となる。
本発明において、電磁波吸収層200、金属反射層201及び化粧保護層203を積層する場合、化粧保護層202も開孔率10〜65%の孔を有することを必須とする。化粧保護層202の開孔率が、10%未満であると、防音部1の吸音性材料100への空気流通が不充分となり、必要な吸遮音効果すなわち騒音低減効果が得られない虞れがある。一方、当該開孔率が65%を超えると、電磁波吸収体2の面積が本来の45%を切ってしまい、所定の電磁波吸収性能が顕現されない虞れがある。
If the open area ratio is 10 to 65%, the area, shape, arrangement, and interval of each hole are not particularly limited. Regarding the method for forming the hole, any conventionally known method may be used, and there is no particular limitation.
However, when the decorative protective layer 202 is laminated on the electromagnetic wave absorbing layer 200, the area, shape, arrangement, and interval of the holes opened in both layers need to be substantially the same.
In this invention, when laminating | stacking the electromagnetic wave absorption layer 200, the metal reflection layer 201, and the makeup | decoration protective layer 203, it is essential that the makeup | decoration protective layer 202 also has a hole with a hole area ratio of 10 to 65%. When the opening ratio of the decorative protective layer 202 is less than 10%, air circulation to the sound-absorbing material 100 of the soundproofing part 1 becomes insufficient, and the necessary sound absorption / insulation effect, that is, a noise reduction effect may not be obtained. is there. On the other hand, when the open area ratio exceeds 65%, the area of the electromagnetic wave absorber 2 cuts the original 45%, and the predetermined electromagnetic wave absorption performance may not be manifested.

本発明で使用される電磁波吸収体2における上記の開孔は、防音部1のル−バ−102に略一致させる位置にあることが好ましく、当該電磁波吸収体2において上当該開孔を設ける場合には、当該防音部1のル−バ−102位置を考慮して開孔することが好ましく、防音部1の吸音性材料100への空気流通を助け、吸遮音効果すなわち騒音低減効果を向上させ、又、電磁波吸収性能を向上させることができる。 The opening in the electromagnetic wave absorber 2 used in the present invention is preferably located at a position that substantially matches the louver 102 of the soundproofing part 1, and the upper hole is provided in the electromagnetic wave absorber 2. For this reason, it is preferable to open the hole in consideration of the position of the louver 102 of the soundproofing part 1, which helps air circulation to the sound-absorbing material 100 of the soundproofing part 1 and improves the sound absorbing and insulating effect, that is, the noise reducing effect. Moreover, electromagnetic wave absorption performance can be improved.

本発明で使用される電磁波吸収体2は、10.0mm以下の厚さであることが必要である。10.0mm以下の厚さの薄物でないと、施工する場所が制限されたりする。本発明で使用される電磁波吸収体2は、10.0mm以下の厚さの薄物で施工する場所を選ばず、必要な場所に容易に施工が可能である。しかも、従来公知の、厚さ60mmを有する電磁波吸収体と斜入射における電磁波吸収特性を比較しても、いずれの入射角度においても優れている。   The electromagnetic wave absorber 2 used in the present invention needs to have a thickness of 10.0 mm or less. If it is not a thin object with a thickness of 10.0 mm or less, the construction site is limited. The electromagnetic wave absorber 2 used in the present invention can be easily applied to a necessary place regardless of a place where the thin object having a thickness of 10.0 mm or less is used. Moreover, even if the electromagnetic wave absorber having a thickness of 60 mm, which is conventionally known, is compared with the electromagnetic wave absorption characteristics at oblique incidence, it is excellent at any incident angle.

本発明により、防音部1に電磁波吸収体2を設置するのに、図2(A)に示すように、防音部1の支柱3に、図2(B)に示すような電磁波吸収体設置用取付部材4を取付け、当該取付部材4に、上記で説明した開孔率10〜65%の孔を有する厚さ10mm以下の電磁波吸収体2を取付ける。
当該支柱3は、図示例のように、例えば、H型鋼により構成される。
図示のように、H型鋼よりなる支柱3に上記取付部材4を、既設の防音部1との間に空間(間隙)5を設けて取り付ける。
支柱3に電磁波吸収体設置用取付部材4を取り付けて、当該取付部材4に電磁波吸収体
を取り付けるので、当該電磁波吸収体2と防音部1との間に大きな隔たり(間隔)を置いてしまうことがあり、また、その間隔が余りに狭すぎてしまうことがあり、そうした場合に、電磁波吸収性能が顕現されなくなったり、或いは騒音低減効果が得られないことが考えられる。
本発明では、当該電磁波吸収体2と防音部1との間の間隙を3〜30mmとすることが望ましい。これは、ある角度を持って入射してきた電磁波が、電磁波吸収体の開孔部により防音部まで抜けてしまった時、3〜30mmの間隔を空けて設置してある場合には、防音部で反射した電磁波が開孔部の内壁部分まで吸収できる確率が高いためである。
In order to install the electromagnetic wave absorber 2 in the soundproofing part 1 according to the present invention, as shown in FIG. 2 (A), the support 3 of the soundproofing part 1 is installed in the electromagnetic wave absorber as shown in FIG. 2 (B). The attachment member 4 is attached, and the electromagnetic wave absorber 2 having a thickness of 10 mm or less and having the hole ratio of 10 to 65% described above is attached to the attachment member 4.
The support column 3 is made of, for example, H-shaped steel, as shown in the drawing.
As shown in the drawing, the mounting member 4 is attached to a support column 3 made of H-shaped steel with a space (gap) 5 provided between the mounting member 4 and the existing soundproof portion 1.
Since the mounting member 4 for installing the electromagnetic wave absorber is attached to the support column 3 and the electromagnetic wave absorber is attached to the mounting member 4, there is a large gap (interval) between the electromagnetic wave absorber 2 and the soundproof part 1. In addition, the interval may be too narrow. In such a case, it may be considered that the electromagnetic wave absorption performance is not manifested or the noise reduction effect cannot be obtained.
In the present invention, it is desirable that the gap between the electromagnetic wave absorber 2 and the soundproofing part 1 is 3 to 30 mm. This is because when an electromagnetic wave incident at a certain angle has passed through the opening of the electromagnetic wave absorber to the soundproofing part, the soundproofing part is installed at an interval of 3 to 30 mm. This is because there is a high probability that the reflected electromagnetic wave can be absorbed up to the inner wall portion of the aperture.

図4は、既存の防音部1に電磁波吸収体2を取り付けた正面図で、H型鋼により構成された支柱3に電磁波吸収体設置用取付部材4を取り付け、当該取付部材4に、開孔を有する8枚の電磁波吸収体2が上下に取設されている例を示す。当該電磁波吸収体2の取り付けは、当該取付部材4にビス止用の貫通穴を開けて、ビスにて取り付けることができる。   FIG. 4 is a front view in which the electromagnetic wave absorber 2 is attached to the existing soundproofing unit 1, and the electromagnetic wave absorber installation mounting member 4 is attached to the column 3 made of H-shaped steel, and an opening is formed in the mounting member 4. An example is shown in which eight electromagnetic wave absorbers 2 are vertically installed. The electromagnetic wave absorber 2 can be attached with a screw by opening a through hole for screwing the attachment member 4.

図7及び8は、更に、当該上下に8枚の開孔を有する電磁波吸収体2が上下に取設されたユニット同士を左右に合体させた例を示す。
この場合、当該電磁波吸収体設置用取付部材同士が隣り合った中央の空間部6は、既設の防音部の支柱が露出し、当該支柱は電磁波吸収能力がなく、電磁波吸収能が問題となるので、当該空間部6に孔の開けていない電磁波吸収体を設置して、電磁波吸収能を奏させるようにする。又、当該電磁波吸収体は、防音部の支持体を覆い隠すように、当該支柱のH型鋼をまたぐ形で設置することが推奨される。
当該孔の開けていない電磁波吸収体は、開孔がない他は、前記の孔の開けられた電磁波吸収体が適用される。
FIGS. 7 and 8 further show an example in which the units in which the electromagnetic wave absorber 2 having eight openings above and below are vertically installed are combined to the left and right.
In this case, in the central space portion 6 where the electromagnetic wave absorber installation mounting members are adjacent to each other, the column of the existing soundproofing unit is exposed, the column does not have an electromagnetic wave absorption capability, and the electromagnetic wave absorption capability becomes a problem. Then, an electromagnetic wave absorber having no holes is installed in the space 6 so as to exhibit the electromagnetic wave absorbing ability. In addition, it is recommended that the electromagnetic wave absorber be installed in a form straddling the H-shaped steel of the support so as to cover the support of the soundproofing part.
The electromagnetic wave absorber having the above holes is applied to the electromagnetic wave absorber having no holes, except that there is no hole.

本発明では、図3に示すように、防音部1と電磁波吸収体設置用取付部材4との間の隙間に、衝撃緩衝材7を挿入することが好ましい。衝撃緩衝材7を挿入することにより、高速道路で自動車が防音壁に衝突した際の衝撃を緩和出来る。当該衝撃緩衝材7は、上記の防音部に電磁波吸収体2を取り付ける際に施工するものであるので、吸音性を有するものであることが望ましい。吸音性を有することにより、防音部で吸音できずに外に漏れた音を吸音することができる。   In this invention, as shown in FIG. 3, it is preferable to insert the shock-absorbing material 7 into the gap between the soundproofing portion 1 and the electromagnetic wave absorber installation mounting member 4. By inserting the shock absorbing material 7, it is possible to mitigate the impact when the automobile collides with the soundproof wall on the highway. Since the shock-absorbing material 7 is applied when the electromagnetic wave absorber 2 is attached to the soundproofing part, it is desirable that the shock-absorbing material 7 has a sound absorbing property. By having sound absorbing properties, it is possible to absorb sound leaked outside without being able to absorb sound by the soundproofing part.

(発明の実施の形態)
本発明の理解に供するため、以下に実施例を記載する。いうまでもなく、本発明は以下の実施例に限定されるものではない。
実施例1.
(Embodiment of the Invention)
In order to provide an understanding of the present invention, examples are described below. Needless to say, the present invention is not limited to the following examples.
Example 1.

ストレ−トアスファルト30質量%、スチレン−ブタジエンゴム10質量%をバインダ−樹脂として、これにマンガン亜鉛系フェライト50質量%、酸化チタン10質量%を加え、均一に混合分散し、カレンダ−ロ−ルにより厚さ4mmの電磁波吸収層を得た。これに、厚さ1mmのステンレス鋼板を金属反射層として密着積層一体化し、厚さ5mmの電磁波吸収シ−トを得た。該電磁波吸収シ−トの全面に、開孔率27%となるように均一に円形の孔を開けた。
道路脇に設置されている厚さ40mmのグラスウ−ルを有し当該グラスウ−ルを囲む様にステンレス製ケ−スで覆われた防音壁構造の支柱に電磁波吸収体設置用取付部材を取付け、当該取付部材に、上記の電磁波吸収シ−トとの間隔を20mmとして設置した。
当該電磁波吸収シ−トの設置により、既存の防音壁の吸音性を維持できるかを、次の試験方法により測定した。結果を表1に示す。
(試験方法)
(1)評価方法:
キャビン法(小型残響質法) 測定室寸法はJIS規格品の約3/1=体積で約1/27による。
(2)試験片
現行品(統一型簿運壁ル−バ−タイプ 約500mmx2000mm )
上記の資料に上記の電磁波吸収シ−ト499mmx468mmを設置。表中の数値は、電波吸収性(単位はdB)を表す。
(結果)
表1に示すように、電磁波吸収シ−トを既存の防音壁に設置しても、既存の防音壁の吸音性を維持できることが判る。
30% by weight of straight asphalt and 10% by weight of styrene-butadiene rubber are used as a binder resin, 50% by weight of manganese zinc ferrite and 10% by weight of titanium oxide are added thereto, and the mixture is uniformly mixed and dispersed. Thus, an electromagnetic wave absorbing layer having a thickness of 4 mm was obtained. To this, a 1 mm thick stainless steel plate was closely laminated and integrated as a metal reflective layer to obtain an electromagnetic wave absorbing sheet having a thickness of 5 mm. Circular holes were uniformly formed on the entire surface of the electromagnetic wave absorbing sheet so that the opening ratio was 27%.
A mounting member for installing an electromagnetic wave absorber is attached to a column of a soundproof wall structure that has a glass wall with a thickness of 40 mm and is covered with a stainless steel case so as to surround the glass wall. The mounting member was installed with a distance of 20 mm from the electromagnetic wave absorbing sheet.
It was measured by the following test method whether the sound-absorbing property of the existing soundproof wall can be maintained by installing the electromagnetic wave absorbing sheet. The results are shown in Table 1.
(Test method)
(1) Evaluation method:
Cabin method (Small reverberation method) Measurement chamber dimensions are approximately 3/1 of a JIS standard product = approximately 1/27 by volume.
(2) Test piece Current product (Unified book carrying wall type, approx. 500mm x 2000mm)
The electromagnetic wave absorbing sheet 499mm x 468mm is installed in the above materials. The numerical values in the table represent radio wave absorptivity (unit: dB).
(result)
As shown in Table 1, it can be seen that the sound absorbing property of the existing soundproof wall can be maintained even if the electromagnetic wave absorbing sheet is installed on the existing soundproof wall.

Figure 0004581124











実施例2.
Figure 0004581124











Example 2

実施例1の電磁波吸収シ−トを、図4に示すように設置し、次の測定方法により電磁波吸収性能の評価を行った。
(測定方法)
(1)評価装置
ベクトルネットワ−クアナライザ−
アンテナ 斜入射15〜80度測定時 誘電体レンズ付円偏波アンテナ
垂直入射(0度) 測定時ホ−ンアンテナ
(2)測定周波数
4.8GHz〜6.8GHzにて掃引して測定した。なお、測定値は5.8GHzとした。
(3)現行防音壁は表面が平坦でないため、電波が入射してくる方向が違えば販社及び吸収条件も変ってくるので、次の2パタ−ンとした。
(I)電波が防音壁の斜め上(下)から入射することを想定する場合
(II)電波が防音壁の斜め左(右)から入射することを想定する場合
評価結果を表2〜表5に示す。表2及び4中の数値は、電波吸収性(単位はdB)を表す。表3及び5中の数値は、ピ−ク周波数(単位はGHz)を表す。
表2及び表3から、防音壁に開孔部と非開孔の断続があるが、本発明によれば、それら相互に差異を生ぜずに電波吸収性能を奏し得ることが判る。
又、 表4及び表5から、防音壁と電磁波吸収体との間隙を空け、その間隙を3〜30mmとすれば電波吸収性能を向上し得ることが判る。
The electromagnetic wave absorption sheet of Example 1 was installed as shown in FIG. 4, and the electromagnetic wave absorption performance was evaluated by the following measurement method.
(Measuring method)
(1) Evaluation equipment Vector network analyzer
Antenna Oblique incidence 15 to 80 degree measurement Circular polarized antenna with dielectric lens Vertical incidence (0 degree) Measurement horn antenna (2) Measurement frequency
Measurement was performed by sweeping at 4.8 GHz to 6.8 GHz. The measured value was 5.8 GHz.
(3) Since the surface of the current soundproof wall is not flat, if the direction in which the radio wave enters is different, the sales company and the absorption conditions change, so the following two patterns were used.
(I) When it is assumed that radio waves are incident from diagonally above (below) the soundproof wall (II) When it is assumed that radio waves are incident from diagonally left (right) of the soundproof wall Shown in Numerical values in Tables 2 and 4 represent radio wave absorptivity (unit: dB). Numerical values in Tables 3 and 5 represent peak frequencies (unit: GHz).
From Tables 2 and 3, it can be seen that the soundproof wall has an opening portion and a non-opening portion, but according to the present invention, radio wave absorption performance can be achieved without producing a difference between them.
Also, from Tables 4 and 5, it can be seen that the radio wave absorption performance can be improved by making a gap between the soundproof wall and the electromagnetic wave absorber and setting the gap to 3 to 30 mm.

Figure 0004581124
Figure 0004581124








Figure 0004581124
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Figure 0004581124
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Figure 0004581124
Figure 0004581124

本発明は、高速道路の料金所付近に留まらず道路の全般に適用することができる。   The present invention can be applied not only to the vicinity of a toll booth on an expressway but also to all roads.

本発明の実施例を示す電磁波吸収・吸遮音構造体の側断面図である。It is a sectional side view of the electromagnetic wave absorption and sound absorption and sound insulation structure which shows the Example of this invention. (A)本発明の実施例を示す電磁波吸収・吸遮音構造体の平面図、(B)同電磁波吸収・吸遮音構造体を構成する取付部材の断面図である。(A) The top view of the electromagnetic wave absorption / sound absorption / sound insulation structure which shows the Example of this invention, (B) It is sectional drawing of the attachment member which comprises the same electromagnetic wave absorption / sound absorption / sound insulation structure. 本発明の電磁波吸収・吸遮音構造体の要部拡大平面図である。It is a principal part enlarged plan view of the electromagnetic wave absorption and sound insulation structure of the present invention. 本発明の実施例を示す電磁波吸収・吸遮音構造体の正面図である。It is a front view of the electromagnetic wave absorption and sound absorption and sound insulation structure which shows the Example of this invention. 本発明に使用される既存の防音部の正面図である。It is a front view of the existing soundproof part used for this invention. 本発明に使用される電磁波吸収体の正面図である。It is a front view of the electromagnetic wave absorber used for this invention. 本発明の他の実施例を示す電磁波吸収・吸遮音構造体の平面図である。It is a top view of the electromagnetic wave absorption and sound absorption and sound insulation structure which shows the other Example of this invention. 本発明の他の実施例を示す電磁波吸収・吸遮音構造体の正面図である。It is a front view of the electromagnetic wave absorption and sound absorption and sound insulation structure which shows the other Example of this invention. 本発明において既存の防音部に電磁波吸収体を設置する説明図である。It is explanatory drawing which installs an electromagnetic wave absorber in the existing soundproof part in this invention.

1 既存の防音部
2 電磁波吸収体
3 支柱
4 取付部材
7 衝撃緩衝部材
102 ル−バ−
DESCRIPTION OF SYMBOLS 1 Existing sound insulation part 2 Electromagnetic wave absorber 3 Support | pillar 4 Mounting member 7 Shock absorbing member 102 Louver

Claims (4)

道路脇に設置されている防音部の支持体に電磁波吸収体設置用取付部材を取付け、当該取付部材に開孔率10〜65%の孔を有する厚さ10mm以下の電磁波吸収体を設置し、当該取付部材同士が隣り合った空間に孔の開けていない電磁波吸収体を設置して、防音部の支持体を覆い隠してなることを特徴とする道路における電磁波吸収・吸遮音構造体。 A mounting member for installing an electromagnetic wave absorber is attached to a support of a soundproof unit installed on the side of the road, and an electromagnetic wave absorber having a thickness of 10 mm or less having holes with a porosity of 10 to 65% is installed on the mounting member, An electromagnetic wave absorbing / absorbing / sound insulating structure on a road, characterized in that an electromagnetic wave absorber that is not perforated is installed in a space in which the mounting members are adjacent to each other, and covers a support of a soundproofing part . 電磁波吸収体と防音部との間の間隔を3〜30mmとしてなることを特徴とする、請求項1に記載の道路における電磁波吸収・吸遮音構造体。2. The electromagnetic wave absorption / sound absorption / insulation structure for a road according to claim 1, wherein a distance between the electromagnetic wave absorber and the soundproofing part is 3 to 30 mm. 電磁波吸収体と防音部との間に、吸音性を有する衝撃緩衝部材を挿入してなることを特徴とする、請求項1に記載の道路における電磁波吸収・吸遮音構造体。 2. The electromagnetic wave absorbing / absorbing / insulating structure for roads according to claim 1, wherein an impact buffering member having a sound absorbing property is inserted between the electromagnetic wave absorber and the soundproofing part. 電磁波吸収体は、防音部のル−バ−に略一致させる位置に孔を開けてなることを特徴とする、請求項1に記載の道路における電磁波吸収・吸遮音構造体。 2. The electromagnetic wave absorbing / absorbing / sound insulating structure for a road according to claim 1, wherein the electromagnetic wave absorber is formed with a hole at a position substantially coinciding with the louver of the soundproofing part.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0679816U (en) * 1993-04-26 1994-11-08 勉 渡辺 Collision mitigation mat
JPH08319605A (en) * 1995-05-24 1996-12-03 Sekisui Jushi Co Ltd Shock absorber for vehicle
JPH10102431A (en) * 1996-10-01 1998-04-21 Furukawa Electric Co Ltd:The Construction method of soundproofing wall with shade material and soundproofing panel with shade material
JPH1144018A (en) * 1997-07-30 1999-02-16 Taisei Corp Method for mounting radio wave absorbing body
JP2002167894A (en) * 2000-11-30 2002-06-11 Daiwa House Ind Co Ltd Stud material
JP2002294639A (en) * 2001-04-03 2002-10-09 Showa Electric Wire & Cable Co Ltd Shock absorbing sound barrier
JP2002302913A (en) * 2001-04-06 2002-10-18 Dekku:Kk Noise barrier for road
JP2003291141A (en) * 2002-04-05 2003-10-14 Shiienji:Kk Material for impact absorber, material for sound absorber, heat-resistant material, material manufacturing apparatus, material manufacturing method, and thermally meltable solidified object
JP2003318589A (en) * 2002-04-22 2003-11-07 Mitsubishi Cable Ind Ltd Radio wave/sound wave absorbing structure and radio wave/sound wave absorbing wall employing it
JP2003336225A (en) * 2002-05-23 2003-11-28 Sekisui Jushi Co Ltd Furring strip for panel installation
JP2004134571A (en) * 2002-10-10 2004-04-30 Nippon Tokushu Toryo Co Ltd Sound-absorption electromagnetic wave absorbing material
JP2004259910A (en) * 2003-02-26 2004-09-16 Tdk Corp Unwanted radio wave suppressing structure

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0679816U (en) * 1993-04-26 1994-11-08 勉 渡辺 Collision mitigation mat
JPH08319605A (en) * 1995-05-24 1996-12-03 Sekisui Jushi Co Ltd Shock absorber for vehicle
JPH10102431A (en) * 1996-10-01 1998-04-21 Furukawa Electric Co Ltd:The Construction method of soundproofing wall with shade material and soundproofing panel with shade material
JPH1144018A (en) * 1997-07-30 1999-02-16 Taisei Corp Method for mounting radio wave absorbing body
JP2002167894A (en) * 2000-11-30 2002-06-11 Daiwa House Ind Co Ltd Stud material
JP2002294639A (en) * 2001-04-03 2002-10-09 Showa Electric Wire & Cable Co Ltd Shock absorbing sound barrier
JP2002302913A (en) * 2001-04-06 2002-10-18 Dekku:Kk Noise barrier for road
JP2003291141A (en) * 2002-04-05 2003-10-14 Shiienji:Kk Material for impact absorber, material for sound absorber, heat-resistant material, material manufacturing apparatus, material manufacturing method, and thermally meltable solidified object
JP2003318589A (en) * 2002-04-22 2003-11-07 Mitsubishi Cable Ind Ltd Radio wave/sound wave absorbing structure and radio wave/sound wave absorbing wall employing it
JP2003336225A (en) * 2002-05-23 2003-11-28 Sekisui Jushi Co Ltd Furring strip for panel installation
JP2004134571A (en) * 2002-10-10 2004-04-30 Nippon Tokushu Toryo Co Ltd Sound-absorption electromagnetic wave absorbing material
JP2004259910A (en) * 2003-02-26 2004-09-16 Tdk Corp Unwanted radio wave suppressing structure

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