JPH0730324A - Dielectric lens - Google Patents
Dielectric lensInfo
- Publication number
- JPH0730324A JPH0730324A JP5174016A JP17401693A JPH0730324A JP H0730324 A JPH0730324 A JP H0730324A JP 5174016 A JP5174016 A JP 5174016A JP 17401693 A JP17401693 A JP 17401693A JP H0730324 A JPH0730324 A JP H0730324A
- Authority
- JP
- Japan
- Prior art keywords
- dielectric lens
- radome layer
- mold
- foam
- molding
- 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.)
- Granted
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Aerials With Secondary Devices (AREA)
- Details Of Aerials (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、誘電体レンズ、特に、
通信、放送用のマイクロ波受信用アンテナ素子として使
用される誘電体レンズに関する。BACKGROUND OF THE INVENTION The present invention relates to a dielectric lens, especially
The present invention relates to a dielectric lens used as a microwave receiving antenna element for communication and broadcasting.
【０００２】[0002]
【従来の技術】従来、５０ＧＨｚ以上のマイクロ波の受
信用アンテナ素子としては、ポリプロピレン、ポリエチ
レン、ポリスチレン等の樹脂材料と発泡剤、誘電率調整
剤としてのセラミック粉末を混合したものをドーム形状
に発泡成形した誘電体レンズが知られている。この種の
誘電体レンズでは、発泡成形時にその表面部分が固化し
てレドーム層が形成される。レドーム層は発泡本体部の
耐候性、強度補強用の保護層として機能する。2. Description of the Related Art Conventionally, as an antenna element for receiving microwaves of 50 GHz or more, a mixture of a resin material such as polypropylene, polyethylene, polystyrene and a foaming agent and ceramic powder as a dielectric constant adjusting agent is foamed in a dome shape. Molded dielectric lenses are known. In this type of dielectric lens, the surface portion is solidified during foam molding to form a radome layer. The radome layer functions as a protective layer for reinforcing the weather resistance and strength of the foam body.
【０００３】ところで、この種の誘電体レンズには、ア
ンテナとして組み立てるために、ブラケットへ取り付け
るための取付け片を設ける必要がある。従来ではインサ
ート成形法とサンドイッチ成形法が行われていた。イン
サート成形法は、取付け片を予め高強度樹脂又は金属で
作製しておき、この取付け片を金型に挿入した状態で発
泡材料を金型に充填し、発泡成形と同時に取付け片を成
形品（誘電体レンズ）に固定してしまう。しかし、この
方法では取付け片を別途作製する費用やインサート工程
が増加する問題点を有している。By the way, in this type of dielectric lens, it is necessary to provide a mounting piece for mounting on a bracket in order to assemble it as an antenna. Conventionally, the insert molding method and the sandwich molding method have been used. In the insert molding method, the attachment piece is made of high-strength resin or metal in advance, and the foam material is filled into the mold while the attachment piece is inserted into the mold. It will be fixed to the dielectric lens). However, this method has a problem that the cost for separately manufacturing the attachment piece and the insert process increase.
【０００４】サンドイッチ成形法は、レドーム層と発泡
本体部を別の樹脂で成形する方法であり、まず、レドー
ム層に相当する部分を高強度樹脂で射出成形し、この部
分に取付け片も一体的に成形する。次に、発泡材料を充
填して発泡本体部を成形する。しかし、この方法では射
出シリンダを２本必要とし、成形用材料も２種類必要と
する問題点を有している。The sandwich molding method is a method of molding the radome layer and the foam main body with different resins. First, the portion corresponding to the radome layer is injection-molded with a high-strength resin, and the mounting piece is also integrated with this portion. To mold. Next, the foam material is filled to mold the foam main body. However, this method has a problem that it requires two injection cylinders and two types of molding materials.
【０００５】[0005]
【発明の目的、構成、作用、効果】そこで、本発明の目
的は、１種類の成形用材料を用いて簡単な工程で取付け
片を設けることのできる誘電体レンズを提供することに
ある。以上の目的を達成するため、本発明に係る誘電体
レンズは、樹脂を主成分とする発泡材料を金型に充填
し、略ドーム形状に、かつ、表面部分にレドーム層が所
定の厚さで固化するように発泡成形された誘電体レンズ
であって、前記レドーム層から一体的に外方に延在した
取付け片を有する。SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a dielectric lens in which a mounting piece can be provided by a simple process using one type of molding material. In order to achieve the above object, the dielectric lens according to the present invention has a mold filled with a foam material containing a resin as a main component, and has a substantially dome shape and a radome layer having a predetermined thickness on the surface portion. A dielectric lens foam-molded to solidify, having a mounting piece integrally extending outwardly from the radome layer.
【０００６】溶融状態にある発泡材料は金型に充填され
ると直ちに発泡を開始し、発泡成形品の表面部分にはレ
ドーム層が形成される。金型のキャビティには取付け片
を成形するための凹部が形成されており、レドーム層と
なるべき材料がこの凹部に入り込み、固化する。即ち、
本発明によれば、発泡成形品の表面固化部分（レドーム
層）に一体的に取付け片が形成されているため、取付け
片を別途作製してインサートモールドすること、あるい
は、成形材料を２種類用意していわゆる２色成形する必
要はなく、簡単な工程で安価に誘電体レンズを得ること
ができる。The foamed material in a molten state starts foaming immediately after being filled in the mold, and a radome layer is formed on the surface portion of the foamed molded product. A recess for molding the attachment piece is formed in the cavity of the mold, and the material to be the radome layer enters the recess and solidifies. That is,
According to the present invention, since the mounting piece is integrally formed on the surface-solidified portion (radome layer) of the foamed molded product, the mounting piece is separately manufactured and insert-molded, or two types of molding materials are prepared. Therefore, it is not necessary to perform so-called two-color molding, and a dielectric lens can be obtained at low cost by a simple process.
【０００７】[0007]
【実施例】以下、本発明に係る誘電体レンズの実施例に
ついて、添付図面を参照して説明する。図１において、
１は誘電体レンズ、２は発泡本体部、３はレドーム層、
４，４は取付け片である。誘電体レンズ１は、溶融状態
にある発泡材料を図示しない金型に充填することにより
成形される。この射出発泡成形において、発泡体の表面
部分にはレドーム層３が所定の厚さで固化する。金型の
キャビティには取付け片４，４を成形するための凹部が
形成されており、発泡材料がこの凹部に入り込み、レド
ーム層３と一体的に固化し、取付け片４，４が成形され
る。なお、取付け片４に形成されている穴５は成形／冷
却後に穿孔したものである。Embodiments of the dielectric lens according to the present invention will be described below with reference to the accompanying drawings. In FIG.
1 is a dielectric lens, 2 is a foam main body, 3 is a radome layer,
Reference numerals 4 and 4 are attachment pieces. The dielectric lens 1 is molded by filling a molten foam material into a mold (not shown). In this injection foam molding, the radome layer 3 is solidified in a predetermined thickness on the surface portion of the foam. The cavity of the mold is formed with a recess for molding the mounting pieces 4, 4, and the foam material enters the recess and solidifies integrally with the radome layer 3 to mold the mounting pieces 4, 4. . The holes 5 formed in the attachment piece 4 are formed after molding / cooling.
【０００８】発泡成形において使用される発泡材料は、
樹脂材料としてはポリプロピレンを９８ｗｔ％、発泡剤
としてはアゾジカルボンアミドを２ｗｔ％の組成からな
る。また、誘電率調整剤としてＣａＴｉＯ3を用いても
よい。この発泡材料をシリンダから金型のキャビティに
射出する。キャビティは半径９０ｍｍの半球状をなし、
この形状の誘電体レンズ１が得られる。射出発泡成形の
条件は以下のとおりである。The foam material used in foam molding is
The resin material has a composition of 98 wt% polypropylene and the foaming agent has a composition of 2 wt% azodicarbonamide. In addition, CaTiO 3 may be used as the dielectric constant adjusting agent. This foam material is injected from the cylinder into the mold cavity. The cavity is hemispherical with a radius of 90 mm,
The dielectric lens 1 having this shape is obtained. The conditions for injection foam molding are as follows.
【０００９】 シリンダ温度：２３０℃ 金型温度：６０℃ 射出圧力：１４４８ｋｇ／ｃｍ2 保圧：２７１．５ｋｇ／ｃｍ2 射出時間：４．７２ｓｅｃ 金型は熱伝導率の良好な金属材（銅又は鉄等）で構成さ
れ、冷却液を循環させることで６０℃に維持する。材料
の射出後は本体部２の発泡状態、レドーム層３の固化状
態に応じて、例えば約９０秒経過したときに成形品（誘
電体レンズ１）を金型から取り出し、空気中で自然冷却
する。Cylinder temperature: 230 ° C. Mold temperature: 60 ° C. Injection pressure: 1448 kg / cm 2 Holding pressure: 271.5 kg / cm 2 Injection time: 4.72 sec The mold is a metal material with good thermal conductivity (copper or The temperature is maintained at 60 ° C. by circulating a cooling liquid. After the injection of the material, the molded product (dielectric lens 1) is taken out of the mold after about 90 seconds, for example, depending on the foaming state of the main body 2 and the solidification state of the radome layer 3, and is naturally cooled in air. .
【００１０】レドーム層３の生長状態は、専ら金型のキ
ャビティ部分の温度と射出後の冷却時間によって左右さ
れ、前記の条件では約１ｍｍの厚さで固化した。レドー
ム層３の厚さは、レンズ効率の点から２ｍｍ以下が好ま
しい。この条件を満足し、かつ、レドーム層３及び取付
け片４，４を必要な硬さに固化させるには、成形時間の
短縮化をも考慮して、金型の温度は約５０〜７０℃、そ
の保持時間は約８０〜１００秒が好ましい。The growth state of the radome layer 3 depends on the temperature of the cavity of the mold and the cooling time after injection, and under the above conditions, it solidified to a thickness of about 1 mm. The thickness of the radome layer 3 is preferably 2 mm or less from the viewpoint of lens efficiency. In order to satisfy this condition and solidify the radome layer 3 and the attachment pieces 4 and 4 to a required hardness, the mold temperature is about 50 to 70 ° C. in consideration of shortening the molding time. The holding time is preferably about 80 to 100 seconds.
【００１１】誘電体レンズ１を金型から取り出した後、
発泡本体部２は発泡を若干継続するが、レドーム層３は
ほとんど固化しているために発泡圧力で変形するおそれ
はない。但し、レドーム層３の変形を確実に防止するに
は、金型から取り出された誘電体レンズ１を、さらにレ
ドーム層３の外形と同じ内形のキャビティを有する冷却
／保形用金型に所定の圧力で、所定の時間収容しておく
ことが好ましい。発泡本体部２はこの状態でも発泡を若
干継続するが、表面部分に形成されたレドーム層３は冷
却／保形金型によって規制されているため、発泡圧力で
全く変形することなく固化する。After taking out the dielectric lens 1 from the mold,
Although the foam main body 2 continues to foam a little, the radome layer 3 is almost solidified, so there is no risk of deformation due to foaming pressure. However, in order to surely prevent the deformation of the radome layer 3, the dielectric lens 1 taken out from the mold is further provided in a cooling / shape retaining mold having a cavity of the same internal shape as the outer shape of the radome layer 3. It is preferable to store at a pressure of 5 for a predetermined time. The foam main body 2 continues to foam slightly even in this state, but since the radome layer 3 formed on the surface portion is regulated by the cooling / shape retaining mold, it solidifies without being deformed by the foaming pressure.
【００１２】なお、本発明に係る誘電体レンズは前記実
施例に限定するものではなく、その要旨の範囲内で種々
に変更できる。特に、樹脂材料としてはポリエチレン、
ポリスチレン等が使用でき、発泡剤としてはｐ，ｐ−オ
キシベンゼンスルフォニルヒドラジド等を用いてもよ
い。さらに、誘電率調整剤としてはＢａＴｉＯ3、Ｃａ
ＴｉＯ3、ＭｇＴｉＯ3等を使用できる。The dielectric lens according to the present invention is not limited to the above embodiment, but can be variously modified within the scope of the invention. Especially, as the resin material, polyethylene,
Polystyrene or the like can be used, and p, p-oxybenzenesulfonyl hydrazide or the like may be used as the foaming agent. Further, as a dielectric constant adjusting agent, BaTiO 3 , Ca
TiO 3 , MgTiO 3 or the like can be used.
【００１３】また、取付け片４の個数、形状及び大きさ
等は任意である。さらに、誘電体レンズ１の成形条件や
成形工程も任意であり、発泡材料に応じた条件を選択
し、レドーム層３の変形防止のための後工程を付加する
ことができる。The number, shape and size of the mounting pieces 4 are arbitrary. Further, the molding conditions and the molding process of the dielectric lens 1 are also arbitrary, and it is possible to select the conditions according to the foam material and add a post process for preventing the deformation of the radome layer 3.
【図１】本発明の一実施例である誘電体レンズを示し、
（Ａ）は斜視図、（Ｂ）は断面図である。FIG. 1 shows a dielectric lens that is an embodiment of the present invention,
(A) is a perspective view and (B) is a sectional view.
１…誘電体レンズ ２…発泡本体部 ３…レドーム層 ４…取付け片 1 ... Dielectric lens 2 ... Foam body 3 ... Radome layer 4 ... Mounting piece
Claims (1)
填し、略ドーム形状に、かつ、表面部分にレドーム層が
所定の厚さで固化するように発泡成形された誘電体レン
ズであって、前記レドーム層から一体的に外方に延在し
た取付け片を有することを特徴とする誘電体レンズ。1. A dielectric lens obtained by filling a metal mold with a foam material containing a resin as a main component, and foam-molding the mold into a substantially dome shape, and a radome layer having a predetermined thickness solidified on the surface portion. A dielectric lens having a mounting piece integrally and outwardly extending from the radome layer.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17401693A JP3291848B2 (en) | 1993-07-14 | 1993-07-14 | Dielectric lens |
| DE69427789T DE69427789T2 (en) | 1993-06-30 | 1994-06-29 | Method of manufacturing a dielectric lens for an antenna and dielectric lens by this method |
| EP94110101A EP0632524B1 (en) | 1993-06-30 | 1994-06-29 | Method of producing a dielectric lens for an antenna and dielectric lens obtainable by said method |
| US08/691,791 US6592788B1 (en) | 1993-06-30 | 1996-08-02 | Method of manufacturing a dielectric lens for an antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17401693A JP3291848B2 (en) | 1993-07-14 | 1993-07-14 | Dielectric lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0730324A true JPH0730324A (en) | 1995-01-31 |
| JP3291848B2 JP3291848B2 (en) | 2002-06-17 |
Family
ID=15971171
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17401693A Expired - Fee Related JP3291848B2 (en) | 1993-06-30 | 1993-07-14 | Dielectric lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3291848B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001320230A (en) * | 2000-05-12 | 2001-11-16 | Nec Corp | Dielectric lens and its producing method |
| WO2005013420A1 (en) * | 2003-07-31 | 2005-02-10 | Sumitomo Electric Industries, Ltd. | Luneberg lens and antenna device using the same |
| US7088309B2 (en) | 2001-07-04 | 2006-08-08 | Murata Manufacturing Co., Ltd. | Lens antenna |
| US7301504B2 (en) | 2004-07-14 | 2007-11-27 | Ems Technologies, Inc. | Mechanical scanning feed assembly for a spherical lens antenna |
| US7444913B2 (en) | 2004-10-04 | 2008-11-04 | Makita Corporation | Parallel fences |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW460505B (en) | 1998-04-27 | 2001-10-21 | Sumitomo Chemical Co | Separator for nonaqueous electrolyte battery and lithium secondary battery made from the same |
| EP3732010A1 (en) * | 2017-12-28 | 2020-11-04 | SRG Global, LLC | Microcellular foam body component for a vehicle radar system and its methods of manufacture |
-
1993
- 1993-07-14 JP JP17401693A patent/JP3291848B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001320230A (en) * | 2000-05-12 | 2001-11-16 | Nec Corp | Dielectric lens and its producing method |
| US7088309B2 (en) | 2001-07-04 | 2006-08-08 | Murata Manufacturing Co., Ltd. | Lens antenna |
| WO2005013420A1 (en) * | 2003-07-31 | 2005-02-10 | Sumitomo Electric Industries, Ltd. | Luneberg lens and antenna device using the same |
| US7301504B2 (en) | 2004-07-14 | 2007-11-27 | Ems Technologies, Inc. | Mechanical scanning feed assembly for a spherical lens antenna |
| US7444913B2 (en) | 2004-10-04 | 2008-11-04 | Makita Corporation | Parallel fences |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3291848B2 (en) | 2002-06-17 |
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