JPH01231406A - Electromagnetic wave reflecting body and its forming method - Google Patents
Electromagnetic wave reflecting body and its forming methodInfo
- Publication number
- JPH01231406A JPH01231406A JP5724088A JP5724088A JPH01231406A JP H01231406 A JPH01231406 A JP H01231406A JP 5724088 A JP5724088 A JP 5724088A JP 5724088 A JP5724088 A JP 5724088A JP H01231406 A JPH01231406 A JP H01231406A
- Authority
- JP
- Japan
- Prior art keywords
- electromagnetic wave
- wave reflecting
- plastic material
- material layer
- member layer
- 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
- 238000000034 method Methods 0.000 title claims description 7
- 239000000463 material Substances 0.000 claims abstract description 62
- 239000004033 plastic Substances 0.000 claims abstract description 32
- 229920003023 plastic Polymers 0.000 claims abstract description 32
- 238000001746 injection moulding Methods 0.000 claims abstract description 15
- 238000000465 moulding Methods 0.000 claims description 7
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 239000004020 conductor Substances 0.000 abstract description 5
- 150000001875 compounds Chemical class 0.000 abstract description 4
- 230000001070 adhesive effect Effects 0.000 abstract 2
- 239000010410 layer Substances 0.000 description 39
- 229910052751 metal Inorganic materials 0.000 description 9
- 239000002184 metal Substances 0.000 description 9
- 239000003365 glass fiber Substances 0.000 description 5
- 239000000835 fiber Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 239000011888 foil Substances 0.000 description 3
- 239000011256 inorganic filler Substances 0.000 description 3
- 229910003475 inorganic filler Inorganic materials 0.000 description 3
- 239000012783 reinforcing fiber Substances 0.000 description 3
- 229920005992 thermoplastic resin Polymers 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- -1 Polypropylene Polymers 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- XECAHXYUAAWDEL-UHFFFAOYSA-N acrylonitrile butadiene styrene Chemical compound C=CC=C.C=CC#N.C=CC1=CC=CC=C1 XECAHXYUAAWDEL-UHFFFAOYSA-N 0.000 description 2
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 2
- 239000004676 acrylonitrile butadiene styrene Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000004917 carbon fiber Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 239000002537 cosmetic Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000004745 nonwoven fabric Substances 0.000 description 2
- 229920001707 polybutylene terephthalate Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 229920001187 thermosetting polymer Polymers 0.000 description 2
- 239000002759 woven fabric Substances 0.000 description 2
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
- 244000061354 Manilkara achras Species 0.000 description 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 241000277269 Oncorhynchus masou Species 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- BXOUVIIITJXIKB-UHFFFAOYSA-N ethene;styrene Chemical compound C=C.C=CC1=CC=CC=C1 BXOUVIIITJXIKB-UHFFFAOYSA-N 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 239000002648 laminated material Substances 0.000 description 1
- 238000003475 lamination Methods 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
- 238000010422 painting Methods 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920005606 polypropylene copolymer Polymers 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 229920006337 unsaturated polyester resin Polymers 0.000 description 1
- 229920001567 vinyl ester resin Polymers 0.000 description 1
Landscapes
- Injection Moulding Of Plastics Or The Like (AREA)
- Aerials With Secondary Devices (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、衛星放送用や電波通信用のパラボラアンテ
ナ等に用いられる電磁波反射体及びその成形方法に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electromagnetic wave reflector used in parabolic antennas for satellite broadcasting and radio communication, and a method for molding the same.
衛星放送用や電波通信用のパラボラアンテナには、電磁
波反射体が必要である。このような電磁波反射体は、電
磁波反射材として金属板、金属箔、炭素繊維やアルミコ
ートガラス繊維等を用いた織布や不織布等が用いられて
いた。これらの電磁波反射材は、合成樹脂等から形成さ
れたハックアップ材へ接着されて電磁波反射体を構成し
ていた。Parabolic antennas for satellite broadcasting and radio communications require electromagnetic wave reflectors. Such electromagnetic wave reflectors have been made of metal plates, metal foils, woven fabrics or nonwoven fabrics using carbon fibers, aluminum-coated glass fibers, or the like as electromagnetic wave reflecting materials. These electromagnetic wave reflectors were adhered to a hack-up material made of synthetic resin or the like to constitute an electromagnetic wave reflector.
従来の如く、電磁波反射材として金属板や金属箔等を用
いる場合には、バックアップ材との接着性に問題があっ
た。また、電磁波反射材の表面の腐食対策・美粧用とし
ての耐候性の良好なフィルムとのラミネーションや塗装
等にも手間がかかるという欠点があった。このような欠
点を解決したとしても、金属板や金属箔を面の精度を平
滑性を満足させながら一体成形するのは非常に困難であ
るために、一体成形する前に金属板や金届箔或°いはそ
れらのフィルムとのラミネート材等を予め絞り加工（パ
ラボラ型への予備成形）する等の工夫がなされるが、そ
れには非常に手間がかかると言う欠点があった。更に、
織布や不織布を用いる場合も含めて、反射体の１個の成
形毎に１枚の反射材を供給する必要があるという不具合
があった。Conventionally, when a metal plate, metal foil, or the like is used as an electromagnetic wave reflecting material, there is a problem in adhesiveness with a backup material. Another disadvantage is that lamination and painting of the surface of the electromagnetic wave reflecting material with a weather-resistant film for use as a countermeasure against corrosion and for cosmetic purposes is time-consuming. Even if these drawbacks were solved, it would be extremely difficult to integrally mold a metal plate or metal foil while satisfying surface accuracy and smoothness, so it is necessary to Alternatively, attempts have been made to draw the laminate material with these films in advance (preforming it into a parabolic shape), but this method has the drawback of being very time-consuming. Furthermore,
Including cases where woven fabrics or non-woven fabrics are used, there is a problem in that it is necessary to supply one sheet of reflective material for each molding of the reflector.
この発明は、上述の欠点を改良するためになされたもの
であり、効率的にしかも確率良く良好な電磁波反射体を
得ること及びその成形方法を提供することを目的とする
。This invention was made to improve the above-mentioned drawbacks, and aims to efficiently obtain a good electromagnetic wave reflector with high probability and to provide a method for molding the same.
上述の目的を達成するため、この発明は、導電性プラス
チック材料から電磁波反射材層を形成し、電磁波反射材
層の裏面にプラスチック材料からバックアップ材層を形
成したものである。また、電磁波反射体を構成する電磁
波反射材層を射出成形して電磁波反射体を製造するもの
である。In order to achieve the above-mentioned object, the present invention forms an electromagnetic wave reflecting material layer from a conductive plastic material, and forms a backup material layer from a plastic material on the back side of the electromagnetic wave reflecting material layer. Further, the electromagnetic wave reflector is manufactured by injection molding the electromagnetic wave reflector layer that constitutes the electromagnetic wave reflector.
この発明では、導電性プラスチック材料で電磁波反射材
層を形成するので、従来の如くバックアップ材との接着
性不良の問題もなく電磁波反射材層の加工が容易となり
、導電性プラスチック材料は射出成形が可能となるので
、二層射出成形法とかサンドインチ射出成形法を用いれ
ば、極めて容易に電磁波反射体を成形することが低コス
トで行える。In this invention, since the electromagnetic wave reflecting material layer is formed of a conductive plastic material, the processing of the electromagnetic wave reflecting material layer is easy without the problem of poor adhesion with the backup material as in the past, and the conductive plastic material can be injection molded. Therefore, by using the two-layer injection molding method or the sandwich injection molding method, it is possible to mold the electromagnetic wave reflector extremely easily and at low cost.
以下に、この発明の好適な実施例を図面を参照して説明
する。Preferred embodiments of the present invention will be described below with reference to the drawings.
第１図に示す反射体は、電磁波反射材層ｌを導電性プラ
スチック材料から形成し、バックアップ材層２をプラス
チック材料から形成し、両層を積層成形したものである
。電磁波反射材層ｌは、導電性材料をプラスチックの中
に混入し、導電性プラスチックコンパウンドを作り、こ
のコンパウンドを射出成形したものである。導電性材料
としては、アルミニウム粉、ニッケル粉、銅粉、銀粉等
の金属粉や金属繊維、炭素繊維、金属メツキ有機繊維、
金属メツキガラス繊維、金属コートガラス繊維、硫化銅
付着有機繊維等の導電性繊維、カーボンブラック粉等を
使用することができる。このような導電性材料を混入し
ておくプラスチックとしては、ポリプロピレン（ＰＰ）
、アクリロニトリル・ブタジェン・スチレン共重合体（
ＡＢＳ）、アクリロニトリル・エチレン・スチレンまた
はそれにプロピレンを加えた共重合体（ＡＥＳ） 、ポ
リスチレン（ＰＳ）、ポリカーボネイト（ＰＣ）、ポリ
ブチレンテレフタレート（ＰＢＴ）、ナイロン等の熱可
塑性樹脂或いはそれらにガラス繊維等の強化繊維を含有
させた繊維強化熱可塑性樹脂、更にはそれらに炭酸カル
シウム、タルク、マイカ等の無機充填剤や紫外線吸収剤
、酸化防止剤等を含有させた熱可塑性樹脂を使用するこ
とができる。In the reflector shown in FIG. 1, the electromagnetic wave reflecting material layer 1 is formed from a conductive plastic material, the backup material layer 2 is formed from a plastic material, and both layers are laminated and molded. The electromagnetic wave reflecting material layer 1 is obtained by mixing a conductive material into plastic to make a conductive plastic compound, and then injection molding this compound. Examples of conductive materials include metal powders and metal fibers such as aluminum powder, nickel powder, copper powder, and silver powder, carbon fibers, metal-plated organic fibers,
Conductive fibers such as metal-plated glass fibers, metal-coated glass fibers, copper sulfide-attached organic fibers, carbon black powder, etc. can be used. Polypropylene (PP) is a plastic mixed with such a conductive material.
, acrylonitrile-butadiene-styrene copolymer (
ABS), acrylonitrile/ethylene/styrene or a copolymer of propylene (AES), polystyrene (PS), polycarbonate (PC), polybutylene terephthalate (PBT), thermoplastic resins such as nylon, or glass fibers, etc. Fiber-reinforced thermoplastic resins containing reinforcing fibers, and thermoplastic resins containing inorganic fillers such as calcium carbonate, talc, mica, ultraviolet absorbers, antioxidants, etc. can be used. .
或いは、不飽和ポリエステル樹脂、ビニルエステル樹脂
、エポキシ樹脂等の熱硬化性樹脂或いはそれらにガラス
繊維等の強化繊維や無機充填剤等を含有させた熱硬化性
樹脂を使用することもできる。Alternatively, thermosetting resins such as unsaturated polyester resins, vinyl ester resins, epoxy resins, or thermosetting resins containing reinforcing fibers such as glass fibers, inorganic fillers, etc. can also be used.
導電性材料の重量含有量としては、５〜６０％含有させ
ることができる。強化繊維を用いる場合には、１〜５５
％であり、特に射出成形の場合には１〜３５％程度が望
ましい。無機充填剤を含有させる場合には、１〜２００
％を含有させることができる。また、ひけやそりの防止
のために発泡剤を添加して発泡率を１．０１〜１．１５
にして使用することも可能である。バックアンプ材層２
としては、先に述べたプラスチック材料と同様の種類及
び含有量のプラスチックを用いることができる。電磁波
反射材層１のプラスチックの種類とバックアンプ材層２
のプラスチックの種類とは、収縮率が同程度で樹脂間の
接合性が良好となるような組合せを選択することが望ま
しい。肉厚は、電磁波反射材層ｌ、バックアップ材層２
共に０． ５〜３鶴程度が望ましい。The weight content of the conductive material can be 5 to 60%. When using reinforcing fibers, 1 to 55
%, and particularly in the case of injection molding, about 1 to 35% is desirable. When containing an inorganic filler, 1 to 200
%. In addition, to prevent sinking and warping, a foaming agent is added to increase the foaming rate to 1.01 to 1.15.
It is also possible to use it as Back amplifier material layer 2
Plastics of the same type and content as the plastic materials mentioned above can be used as the material. Type of plastic for electromagnetic wave reflecting material layer 1 and back amplifier material layer 2
It is desirable to select a combination of types of plastics that have similar shrinkage rates and good bonding properties between the resins. The wall thickness is electromagnetic wave reflecting material layer 1, backup material layer 2
Both are 0. Approximately 5 to 3 cranes are desirable.
第２図に示す反射体は、三層構造のものを示し、表面側
のバックアップ材層２が電磁波反射材層１の表面の腐食
防止用・美粧用のコーティング層を形成している。The reflector shown in FIG. 2 has a three-layer structure, and the backup material layer 2 on the front side forms a corrosion-preventing and cosmetic coating layer on the surface of the electromagnetic wave reflecting material layer 1.
第３図（ａ）〜（ｄ）は、第１図に示す電磁波反射体を
二層射出成形法により成形する場合を説明したものであ
り、まず内層を構成する電磁波反射材層ｌとして射出成
形機より導電性プラスチック材料を一次金型３内のキャ
ビティ４に射出する（第３図（ａ）参照）。次いで、旋
回させ再び型を閉め（第３図（ｂ） ・ （ｃ）参照
）、この状態で電磁波反射材層１の外層（二次金型５の
キャビティ６内）にプラスチック材料を射出してバソク
ア・７プ材層２を成形する（第３図（ｄ）参照）。Figures 3 (a) to (d) illustrate the case where the electromagnetic wave reflector shown in Figure 1 is molded by a two-layer injection molding method. A conductive plastic material is injected into the cavity 4 in the primary mold 3 by a machine (see FIG. 3(a)). Next, the mold is rotated and closed again (see Fig. 3 (b) and (c)), and in this state, the plastic material is injected into the outer layer of the electromagnetic wave reflecting material layer 1 (inside the cavity 6 of the secondary mold 5). The bathoqua 7 material layer 2 is formed (see FIG. 3(d)).
一方、−成金型３のキャビティ４内では導電性プラスチ
ック材料を射出して電磁波反射材層１を成形していく。On the other hand, in the cavity 4 of the -molding mold 3, a conductive plastic material is injected to form the electromagnetic wave reflecting material layer 1.
このようなサイクルを繰り返していけば、効率良く電磁
波反射体を成形していくことができる。また、第２図の
三層構造のものでも第３図（ａ）〜（ｂｌと同様の原理
で、周上に３台の射出成形機を準備し、順次に積層成形
してもよい。By repeating such a cycle, it is possible to form an electromagnetic wave reflector efficiently. In addition, even for the three-layer structure shown in FIG. 2, three injection molding machines may be prepared on the circumference and laminated molding may be carried out in sequence based on the same principle as shown in FIGS. 3(a) to (bl).
第４図（ａ）〜（ｃ）に示す方法は、サンドインチ射出
成形法であり、第２図に示す三層構造の電磁波反射体を
成形するものである。これは、最初にバンクアップ材層
２を形成するプラスチック材料をノズル７から射出し、
射出途中において導電性プラスチック材料をノズル８か
ら射出して、この導電性プラスチック材料をプラスチッ
ク材料でサンドインチ状態にしながら成形するものであ
る。The method shown in FIGS. 4(a) to 4(c) is a sandwich injection molding method, and is used to mold the electromagnetic wave reflector having the three-layer structure shown in FIG. 2. This involves first injecting the plastic material forming the bank-up material layer 2 from the nozzle 7;
During injection, a conductive plastic material is injected from a nozzle 8, and the conductive plastic material is molded while being sandwiched with the plastic material.
図示した二層射出成形法やサンドイッチ射出成形法によ
らずに、電磁波反射材層１とバックアップ材層２をシー
ト形状にし、これらを積層して圧縮成形することも可能
である。Instead of using the illustrated two-layer injection molding method or sandwich injection molding method, it is also possible to form the electromagnetic wave reflecting material layer 1 and the backup material layer 2 into sheet shapes, laminate them, and compression mold them.
以上説明したように、この発明によれば、導電性プラス
チック材料から電磁波反射材層を形成し、電磁波反射材
層の裏面にプラスチック材料からバンクアンプ材層を形
成したので、従来の如く電磁波反射材層の加工に手間が
かかることもなくなる。As explained above, according to the present invention, the electromagnetic wave reflecting material layer is formed from a conductive plastic material, and the bank amplifier material layer is formed from a plastic material on the back side of the electromagnetic wave reflecting material layer. It also eliminates the need for time-consuming processing of layers.
また、電磁波反射材層を射出成形して電磁波反射体を製
造する場合には、容易かつ迅速に電磁波反射体を成形す
ることができる。Further, when manufacturing an electromagnetic wave reflector by injection molding the electromagnetic wave reflector layer, the electromagnetic wave reflector can be easily and quickly molded.
第１図はこの発明の好適な実施例を示す断面図、第２図
は三層に構成した電磁波反射体の断面図、第３図（ａ）
乃至（ｄ）は二層射出成形法の説明図、第４図（ａ）乃
至（Ｃ）はサンドインチ射出成形法の説明図である。
１ ・・・電るｎ波反射材層、
２ ・・・バックアップ材層。
出願人 株式会社 ブリデストン
代理人 弁理士 増 １）竹 夫
寥 １ 図 筑 ２７λ ３ 図Fig. 1 is a sectional view showing a preferred embodiment of the present invention, Fig. 2 is a sectional view of an electromagnetic wave reflector configured in three layers, and Fig. 3(a).
4(a) to (d) are explanatory diagrams of the two-layer injection molding method, and FIGS. 4(a) to (C) are explanatory diagrams of the sandwich injection molding method. 1... N-wave reflective material layer, 2... Backup material layer. Applicant: Brideston Co., Ltd. Agent: Patent Attorney Masu 1) Takeo Futoshi 1 Figure Chiku 27λ 3 Figure
Claims (1)
し、 電磁波反射材層の裏面にプラスチック材料からバックア
ップ材層を形成したことを特徴とする電磁波反射体。 ２、請求項１記載の電磁波反射体を構成する電磁波反射
材層を射出成形して電磁波反射体を製造することを特徴
とする電磁波反射体の成形方法。 ３、バックアップ材層も射出成形して両層を積層成形す
ることを特徴とする請求項２項に記載の電磁波反射体の
成形方法。[Claims] 1. An electromagnetic wave reflector, characterized in that an electromagnetic wave reflecting material layer is formed from a conductive plastic material, and a backup material layer is formed from a plastic material on the back side of the electromagnetic wave reflecting material layer. 2. A method for molding an electromagnetic wave reflector, which comprises manufacturing the electromagnetic wave reflector by injection molding the electromagnetic wave reflector layer constituting the electromagnetic wave reflector according to claim 1. 3. The method for molding an electromagnetic wave reflector according to claim 2, wherein the backup material layer is also injection molded and both layers are laminated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5724088A JPH01231406A (en) | 1988-03-10 | 1988-03-10 | Electromagnetic wave reflecting body and its forming method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5724088A JPH01231406A (en) | 1988-03-10 | 1988-03-10 | Electromagnetic wave reflecting body and its forming method |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11869588A Division JPH01231405A (en) | 1988-05-16 | 1988-05-16 | Manufacture of electromagnetic wave reflecting body |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01231406A true JPH01231406A (en) | 1989-09-14 |
Family
ID=13050011
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5724088A Pending JPH01231406A (en) | 1988-03-10 | 1988-03-10 | Electromagnetic wave reflecting body and its forming method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01231406A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04118211A (en) * | 1990-08-08 | 1992-04-20 | Mikuni Plast Kk | Manufacture of parabola antenna |
-
1988
- 1988-03-10 JP JP5724088A patent/JPH01231406A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04118211A (en) * | 1990-08-08 | 1992-04-20 | Mikuni Plast Kk | Manufacture of parabola antenna |
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