JPH03177098A - Radio wave absorber - Google Patents
Radio wave absorberInfo
- Publication number
- JPH03177098A JPH03177098A JP31438689A JP31438689A JPH03177098A JP H03177098 A JPH03177098 A JP H03177098A JP 31438689 A JP31438689 A JP 31438689A JP 31438689 A JP31438689 A JP 31438689A JP H03177098 A JPH03177098 A JP H03177098A
- Authority
- JP
- Japan
- Prior art keywords
- outer shell
- radio wave
- dielectric
- wave absorber
- wedge
- 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 25
- 239000012780 transparent material Substances 0.000 claims description 5
- 239000002245 particle Substances 0.000 abstract description 12
- 239000002994 raw material Substances 0.000 abstract 2
- 238000010030 laminating Methods 0.000 abstract 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 7
- 238000010521 absorption reaction Methods 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 6
- 239000000853 adhesive Substances 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- 239000006260 foam Substances 0.000 description 5
- 239000008187 granular material Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- 239000011111 cardboard Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005187 foaming Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005992 thermoplastic resin Polymers 0.000 description 2
- 229920005830 Polyurethane Foam Polymers 0.000 description 1
- 229920006328 Styrofoam Polymers 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 229920006248 expandable polystyrene Polymers 0.000 description 1
- 239000004794 expanded polystyrene Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 239000004816 latex Substances 0.000 description 1
- 229920000126 latex Polymers 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000011087 paperboard Substances 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 229920006327 polystyrene foam Polymers 0.000 description 1
- 239000011496 polyurethane foam Substances 0.000 description 1
- 239000008261 styrofoam Substances 0.000 description 1
- 239000012815 thermoplastic material Substances 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〕
この発明は、電波吸収体に係わり、更に詳しくは外殻の
内部に充填する誘電体をブロック状に構成した電波吸収
体に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a radio wave absorber, and more particularly to a radio wave absorber in which a dielectric material filled inside an outer shell is configured in a block shape.
従来使用されている誘電型電波吸収体１ａ。 A conventionally used dielectric type radio wave absorber 1a.
ｌｂとしては、例えば第３図に示すように、四角錐状の
突起２を表面に設けたものや、第４図に示すように、楔
状の突起３を表面に設けたものが知られている。For example, as shown in FIG. 3, there are known lbs having square pyramid-shaped protrusions 2 on the surface, and as shown in FIG. 4, there are wedge-shaped protrusions 3 on the surface. .
これらの誘電型電波吸収体１ａ、ｌｂの構成材料として
は、軟質ポリウレタンフォームに導電性カーボンブラッ
クディスバージョンを含浸させたもの、または発泡ポリ
スチロール製造時にスチロールビーズとカーボンブラッ
クとの混合発泡体等により製造され、モして誘電型電波
吸収体１ａ、ｌｂの裏面を接着剤等を介して電波暗室の
内壁面に貼着させることにより使用するものである。The constituent materials of these dielectric type radio wave absorbers 1a and lb include flexible polyurethane foam impregnated with conductive carbon black dispersion, or mixed foam of styrene beads and carbon black during the manufacture of expanded polystyrene. After being manufactured, the dielectric type radio wave absorbers 1a, 1b are used by attaching their back surfaces to the inner wall surface of a radio anechoic chamber via an adhesive or the like.
ところで、上記のような誘電型電波吸収体１ａ、ｌｂは
、共に上述したように高分子材料の発泡体により構成さ
れ、その大きさは５０ｍｍ〜２５００ｍｍとその吸収す
る電波の波長領域によって大巾にことなり、カーボンの
種類や含浸量も大巾に変化したもので、電波吸収性能も
異なり、更に重量が大きいものとなる問題があった。By the way, the dielectric type radio wave absorbers 1a and lb are both made of foamed polymer materials as described above, and their size varies widely depending on the wavelength range of the radio waves they absorb, ranging from 50 mm to 2500 mm. On the other hand, the type of carbon and the amount of impregnation have changed widely, the radio wave absorption performance has also changed, and there have been problems in that the weight is also large.
そこで、本願出願人は、かかる問題を解決するため、特
願昭６３−３２６２１９号（発明の名称：電波吸収体及
びその製造方法）及び第２図に示すように、ダンボール
及び類似の熱可塑性材料から威るもの、または熱可塑性
樹脂を利用した真空成型品により構成した外殻４の内部
に、−次発泡を行った発泡スチロール（または樹脂発泡
体）に接着剤を付け、その周囲に導電性カーボンを付着
させて誘電損失粒体を構成し、そしてこの導電性カーボ
ンを付着させた誘電損失粒体と、発泡スチロールに導電
性カーボンを付着させない誘電損失粒体とを混合させて
構成した誘電損失粒体５を充填した電波吸収体１ｃを提
案している。Therefore, in order to solve this problem, the applicant of the present application has developed a method for using cardboard and similar thermoplastic materials as shown in Japanese Patent Application No. 63-326219 (title of invention: Radio wave absorber and method for manufacturing the same) and FIG. Inside the outer shell 4, which is made of a vacuum-formed product made from foam or a thermoplastic resin, an adhesive is attached to foamed polystyrene (or resin foam), and conductive carbon is placed around it. A dielectric loss granule is formed by adhering conductive carbon to the dielectric loss granule, and a dielectric loss granule is formed by mixing the dielectric loss granule to which conductive carbon is attached and a dielectric loss granule to which no conductive carbon is attached to Styrofoam. We have proposed a radio wave absorber 1c filled with 5.
然しなから、上記本願出願人が提案した電波吸収体１ｃ
は、外殻４の一部が破損した場合、充填した誘電損失粒
体５等が落下飛散する危険があり、また上記の電波吸収
体１ｃは、誘電損失粒体５が固着しない状態で充填して
いるため、充填状態の変動による誘電率変化及び電波吸
収性能に変化が起きると言う問題があった。However, the radio wave absorber 1c proposed by the above applicant
If a part of the outer shell 4 is damaged, there is a risk that the filled dielectric loss particles 5, etc. will fall and scatter, and the radio wave absorber 1c described above is filled with the dielectric loss particles 5 not fixed. Therefore, there was a problem in that variations in the filling state caused changes in the dielectric constant and radio wave absorption performance.
〔発明の目的］
この発明は、かかる従来の課題に着目して案出されたも
ので、外殻の内部に充填する誘電損失粒体を接着剤を介
して一体化させてブロック状にすることで、外殻の一部
が破損しても破損部から誘電損失粒体が落下したり、飛
散することがなく、また一定形状を保持出来るので誘電
率変化や電波吸収性能の変化もなく、更に多段多層型の
電波吸収体を容易に製造出来る電波吸収体を提供するこ
とを目的とするものである。[Purpose of the Invention] This invention was devised by focusing on the above-mentioned conventional problems, and involves integrating dielectric loss particles filled inside the outer shell with an adhesive to form a block shape. Even if a part of the outer shell is damaged, the dielectric loss particles will not fall or scatter from the damaged part, and since it can maintain a constant shape, there will be no change in dielectric constant or radio wave absorption performance. It is an object of the present invention to provide a radio wave absorber that can be easily manufactured as a multi-stage multilayer radio wave absorber.
この発明は上記目的を達成するため、電波的に透明な材
料を素材として中空状の外殻を形成すると共に、この外
殻の一側面側を先端が四角錐状または楔状に形成し、前
記外殻の内部に、誘電率の異なる複数の誘電体ブロック
を積層させて充填したことを要旨とするものである。In order to achieve the above object, the present invention forms a hollow outer shell using a radio-transparent material, and forms one side of the outer shell into a square pyramid or wedge shape at the tip. The gist is that a plurality of dielectric blocks having different dielectric constants are stacked and filled inside the shell.
この発明は上記のように構成され、電波的に透明な材料
を素材として中空状の外殻内に、誘電体ブロックを積層
させて充填しているので、外殻の一部が破損した場合で
あっても、破損部から誘電損失粒体が落下したり、飛散
することがなくなり、誘電損失粒体同志の配置や形状が
一定状態を保持出来ることから、誘電率変化や電波吸収
性能の変化もなく、更に多段多層型の電波吸収体を容易
に製造出来るものである。This invention is constructed as described above, and the hollow outer shell is filled with dielectric blocks made of a radio-transparent material, so that even if a part of the outer shell is damaged, Even if there is a problem, the dielectric loss particles will not fall or scatter from the damaged part, and the arrangement and shape of the dielectric loss particles will remain constant, so there will be no change in dielectric constant or radio wave absorption performance. Moreover, it is possible to easily manufacture a multi-stage, multi-layer radio wave absorber.
以下添付図面に基いて、この発明の詳細な説明する。 The present invention will be described in detail below based on the accompanying drawings.
第１図は、この発明を実施した電波吸収体１１の断面図
を示し、この電波吸収体１１は、電波的に透明な材料を
素材として中空状の外殻１２を形成すると共に、この外
殻１２の一側面側には、先端が四角錐状（または楔状）
の突起１３が形成しである。FIG. 1 shows a cross-sectional view of a radio wave absorber 11 according to the present invention. One side of 12 has a square pyramid-shaped (or wedge-shaped) tip.
A protrusion 13 is formed.
前記、電波的に透明な材料とは、例えば誘電率３以下で
、厚み１０ｍ以下の紙、ダンボール。The radio-transparent material mentioned above is, for example, paper or cardboard with a dielectric constant of 3 or less and a thickness of 10 m or less.
熱可塑性樹脂シート等を使用した真空成型品であって、
軽量なものである。A vacuum-formed product using thermoplastic resin sheets, etc.
It is lightweight.
なお、上記のように外殻１２の一側面側に形成する先端
が四角錐状の突起１３の形状は、特に限定されず、楔状
とすることも可能である。Note that the shape of the protrusion 13 having a quadrangular pyramidal tip formed on one side of the outer shell 12 as described above is not particularly limited, and may be wedge-shaped.
また、前記外殻１２の内部には、誘電率の異なる複数の
誘電体ブロック１４を積層させて充填してあり、この誘
電体ブロック１４を構成する材料としては、−次発泡を
行った発泡スチロール（または樹脂発泡体）と、カーボ
ンブラック単独、グラファイト単独及びこの両者の混合
物と、ラテックス等を使用するものである。Furthermore, the inside of the outer shell 12 is filled with a plurality of stacked dielectric blocks 14 having different dielectric constants, and the material constituting the dielectric blocks 14 is polystyrene foam that has undergone secondary foaming. or resin foam), carbon black alone, graphite alone, a mixture of both, latex, and the like.
そして、これらの素材は、二次発泡せずに接着剤により
一体化し、異なる誘電率を有する層状のブロック体を形
成して、外殻工２の内部に層状に積層させながら充填す
るものである′。These materials are then integrated with an adhesive without secondary foaming to form a layered block body having different dielectric constants, and are filled into the outer shell 2 while being laminated in layers. '.
なお、必要に応して同一誘電率の層を分割ブロックにし
ても良い。Note that, if necessary, layers having the same dielectric constant may be divided into blocks.
この実施例は、上記のように中空状の外殻１２内に、誘
電体ブロック１４を積層させて充填しているので、外殻
１２の一部が破損した場合であっても、破損部から誘電
損失ね体が落下したり、飛散することがなくなり、また
誘電損失粒体同志の配置や形状が一定状態を保持出来る
ことから、誘電率変化や電波吸収性能の変化もなく、更
に多段多層型の電波吸収体を容易に製造出来るものであ
る。In this embodiment, as described above, the dielectric blocks 14 are laminated and filled in the hollow outer shell 12, so even if a part of the outer shell 12 is damaged, the damaged part will not be removed. Since the dielectric loss particles do not fall or scatter, and the arrangement and shape of the dielectric loss particles can maintain a constant state, there is no change in dielectric constant or radio wave absorption performance, and even more multi-stage multilayer type. The radio wave absorber can be easily manufactured.
この発明は、上記のように電波的に透明な材料を素材と
して中空状の外殻を形成すると共に、この外殻の一側面
側を先端が四角錐状または楔状に形成し、前記外殻の内
部に、誘電率の異なる複数の誘電体ブロックを積層させ
て充填したので、以下のような優れた効果を奏するもの
である。In this invention, a hollow outer shell is formed from a radio-transparent material as described above, and one side of the outer shell is formed with a tip shaped like a square pyramid or a wedge, and the outer shell is Since a plurality of dielectric blocks having different dielectric constants are stacked and filled inside, the following excellent effects can be achieved.
（ａ）、外殻の一部が破損した場合であっても、破損部
から誘電損失粒体が落下したり、飛散することがない。(a) Even if a part of the outer shell is damaged, the dielectric loss particles will not fall or scatter from the damaged part.
（ｂ）、誘電体ブロックは、接着剤により一体化されて
いるので、カーボン被覆された一次発泡粒子同志の配置
や形状等が一定状態を保持でき、従って誘電率変化や電
波吸収性能の変化もなくなる。(b) Since the dielectric block is integrated with an adhesive, the arrangement and shape of the carbon-coated primary foam particles can be maintained constant, so there is no change in dielectric constant or radio wave absorption performance. It disappears.
（Ｃ）、誘電体ブロックの積層構造であるので、多段多
層型の電波吸収体を容易に製造出来る。(C) Since it has a laminated structure of dielectric blocks, a multi-stage, multi-layer radio wave absorber can be easily produced.
（ｄ）、構成が簡単であるので、安価に製造出来る。(d) Since the structure is simple, it can be manufactured at low cost.
第１図は、この発明を実施した電波吸収体の断面図、第
２図は、従来の誘電損失粒体を袋体に封入した電波吸収
体の断面図、第３図及び第４図は従来の電波吸収体の説
明図である。
１１・・・電波吸収体、１２・・・外殻、１３・・・突
起、１４・・・誘電体ブロック。Fig. 1 is a sectional view of a radio wave absorber embodying the present invention, Fig. 2 is a sectional view of a conventional radio wave absorber in which dielectric loss particles are sealed in a bag, and Figs. 3 and 4 are conventional radio wave absorbers. FIG. 2 is an explanatory diagram of a radio wave absorber. 11...Radio wave absorber, 12...Outer shell, 13...Protrusion, 14...Dielectric block.
Claims (1)
ると共に、この外殻の一側面側を先端が四角錐状または
楔状に形成し、前記外殻の内部に、誘電率の異なる複数
の誘電体ブロックを積層させて充填したことを特徴とす
る電波吸収体。A hollow outer shell is formed from a radio-transparent material, and one side of this outer shell has a square pyramid-shaped or wedge-shaped tip, and inside the outer shell there are a plurality of holes having different dielectric constants. A radio wave absorber characterized by being filled with stacked dielectric blocks.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31438689A JPH03177098A (en) | 1989-12-05 | 1989-12-05 | Radio wave absorber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31438689A JPH03177098A (en) | 1989-12-05 | 1989-12-05 | Radio wave absorber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03177098A true JPH03177098A (en) | 1991-08-01 |
Family
ID=18052721
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31438689A Pending JPH03177098A (en) | 1989-12-05 | 1989-12-05 | Radio wave absorber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03177098A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011233834A (en) * | 2010-04-30 | 2011-11-17 | Shachihata Inc | Electromagnetic wave absorber |
-
1989
- 1989-12-05 JP JP31438689A patent/JPH03177098A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011233834A (en) * | 2010-04-30 | 2011-11-17 | Shachihata Inc | Electromagnetic wave absorber |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP1054183B1 (en) | Honeycomb core with controlled crush properties | |
| US7661508B1 (en) | Lightweight speaker enclosure | |
| US4300767A (en) | Inflated game ball having long lasting pressure retention with decreased noise | |
| GB2035897A (en) | Sound insulating elements | |
| EP0239619A4 (en) | Protective envelope device for packaging fragile articles. | |
| DK152400B (en) | SOUND ABSORPTION PLATE FOR AIR SOUND | |
| JP2001517004A5 (en) | ||
| CA2078123A1 (en) | Polypropylene foam sheets | |
| EP0560608B1 (en) | A method of producing a cushion from waste paper or pulp | |
| WO1999063786A1 (en) | Acoustic damping material | |
| JPH03177098A (en) | Radio wave absorber | |
| US3366965A (en) | Omni-directional dielectric lens reflector and method of manufacturing same | |
| JPS6055644B2 (en) | Foam-filled fender | |
| JP2799895B2 (en) | Radio wave absorber | |
| JPH03204999A (en) | Radiowave absorbent body | |
| US3348224A (en) | Electromagnetic-energy absorber and room lined therewith | |
| JPH02174198A (en) | Radio wave absorber and manufacture thereof | |
| JP2973038B2 (en) | Radio wave absorber | |
| JPS54133125A (en) | Diaphragm for speaker | |
| JPH038422Y2 (en) | ||
| GB2065548A (en) | Improvements in portable insulated containers | |
| JPH0456297A (en) | Radio wave absorbing material | |
| JPS5923223B2 (en) | Inflated and pressurized ball for reduced noise and long-term pressure retention | |
| JPS6010825Y2 (en) | Expanded polyolefin resin plate with giant air bubbles | |
| JPS59200296A (en) | Underwater sound absorbing body |