JPH08186434A - Manufacture of dielectric lens for antenna - Google Patents
Manufacture of dielectric lens for antennaInfo
- Publication number
- JPH08186434A JPH08186434A JP6328108A JP32810894A JPH08186434A JP H08186434 A JPH08186434 A JP H08186434A JP 6328108 A JP6328108 A JP 6328108A JP 32810894 A JP32810894 A JP 32810894A JP H08186434 A JPH08186434 A JP H08186434A
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- weight
- dielectric lens
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、誘電体レンズの製造方
法、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の製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a dielectric lens, and more particularly to a method for manufacturing a dielectric lens used as an antenna element for receiving microwaves 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、ポリスチレン等の合成樹脂と発泡剤、誘電率調整
剤としてのセラミック粉末を混合した発泡材料をドーム
形状に発泡成形した誘電体レンズが知られている。通
常、この種の誘電体レンズは射出成形法で製造されてい
るが、通常の射出成形法で肉厚物を成形すると、図３に
示すように表面にヒケ１が生じたり、成形体内に多数の
ボイド２が発生する。2. Description of the Related Art Conventionally, as a receiving antenna element for receiving microwaves of 50 GHz or more, a foam material obtained by mixing a synthetic resin such as polypropylene, polyethylene, polystyrene and a foaming agent, and a ceramic powder as a dielectric constant adjusting agent is formed into a dome shape. Foam-molded dielectric lenses are known. Normally, this type of dielectric lens is manufactured by an injection molding method. However, when a thick material is molded by a normal injection molding method, a sink mark 1 is generated on the surface as shown in FIG. Void 2 occurs.
【０００３】そこで、新たに射出圧縮成形法や、ストラ
クチュラルフォーム成形法（以下、ＳＦ成形法とする）
が提案されている。Therefore, a new injection compression molding method or structural foam molding method (hereinafter referred to as SF molding method) is newly adopted.
Is proposed.
【０００４】射出圧縮成形法では、図４に示すように、
隙間ｔをあけて上型３及び下型４を対向させ、成形材料
を射出した後、型締めを行い、圧縮成形する。In the injection compression molding method, as shown in FIG.
The upper mold 3 and the lower mold 4 are opposed to each other with a gap t, and the molding material is injected, and then the mold is clamped to perform compression molding.
【０００５】上記射出圧縮成形法により得られた誘電体
レンズを図５に縦断面図で示す。誘電体レンズ５では、
上記のように射出圧縮成形法により得られているため、
成形密度が高く、従ってヒケやボイド等の欠陥は生じ難
い。A dielectric lens obtained by the above injection compression molding method is shown in a vertical sectional view in FIG. With the dielectric lens 5,
Since it is obtained by the injection compression molding method as described above,
Since the molding density is high, defects such as sink marks and voids are unlikely to occur.
【０００６】他方、ＳＦ成形法では、金型のキャビティ
内に、該キャビティの体積よりも少ない発泡材料を射出
し、キャビティ内で発泡させて所定の形状の誘電体レン
ズ６を得ている。ＳＦ成形法で得られた誘電体レンズの
断面図を図６に示す。この方法では、発泡によりキャビ
ティの形状に沿った誘電体レンズ６が得られている。On the other hand, in the SF molding method, a foam material having a volume smaller than the volume of the cavity is injected into the cavity of the mold and foamed in the cavity to obtain the dielectric lens 6 having a predetermined shape. FIG. 6 shows a sectional view of a dielectric lens obtained by the SF molding method. In this method, the dielectric lens 6 conforming to the shape of the cavity is obtained by foaming.
【０００７】[0007]
【発明が解決しようとする課題】射出圧縮成形法では、
ヒケやボイド等の欠陥が生じ難く、かつ誘電率の一定な
誘電体レンズ５を得ることができるものの、金型の構造
が複雑であるため、コストが高くつくという問題があっ
た。のみならず、射出圧縮用の専用の成形機を用いなけ
ればならないという問題もあった。In the injection compression molding method,
Although a defect such as a sink mark or a void is unlikely to occur and the dielectric lens 5 having a constant dielectric constant can be obtained, there is a problem that the cost is high because the structure of the mold is complicated. In addition, there is a problem that a dedicated molding machine for injection compression must be used.
【０００８】他方、ＳＦ成形法では、金型構造は射出圧
縮成形法の場合に比べて複雑ではないものの、得られた
誘電体レンズ６において発泡倍率が部分的にばらつき易
く、従って誘電体レンズ６内において誘電率が一定にな
り難い。のみならず、スワールマークと称されている気
泡模様が、表面に生じるという問題もあった。On the other hand, in the SF molding method, although the mold structure is not complicated as compared with the case of the injection compression molding method, the foaming magnification of the obtained dielectric lens 6 is likely to partially vary, and therefore the dielectric lens 6 is used. It is difficult for the dielectric constant to be constant inside. In addition, there is a problem that a bubble pattern called a swirl mark is generated on the surface.
【０００９】よって、本発明の目的は、表面にヒケ、あ
るいはスワールマークまた内部にボイド等が生じ難く、
かつ誘電率やＱなどの電気的特性が均一な誘電体レンズ
を比較的簡単な金型を用いて安価に製造し得る方法を提
供することにある。Therefore, the object of the present invention is to prevent sink marks on the surface, swirl marks, or voids in the interior.
Another object of the present invention is to provide a method capable of inexpensively manufacturing a dielectric lens having uniform electric properties such as dielectric constant and Q using a relatively simple mold.
【００１０】[0010]
【課題を解決するための手段】この発明は、発泡剤を含
有した合成樹脂からなる発泡材料を成形金型内に充填
し、保圧を加えて発泡成形するに際し、発泡材料の充填
量は金型のキャビティの容量に対して８０重量％以上で
あり、発泡材料の充填体積はキャビティの体積に対して
同等以上であり、かつ、発泡倍率は１．３倍以下である
ことを特徴とするものである。SUMMARY OF THE INVENTION According to the present invention, when a foam material made of a synthetic resin containing a foaming agent is filled in a molding die and a holding pressure is applied for foam molding, the filling amount of the foam material is gold. 80% by weight or more with respect to the capacity of the cavity of the mold, the filling volume of the foam material is equal to or more than the volume of the cavity, and the expansion ratio is 1.3 times or less Is.
【００１１】また、この発明は、発泡材料の充填量がキ
ャビティの容量に対して８５〜９１重量％であることを
特徴とするものである。Further, the present invention is characterized in that the filling amount of the foam material is 85 to 91% by weight with respect to the capacity of the cavity.
【００１２】また、この発明は、発泡倍率が１．００〜
１．１７倍であることを特徴とするものである。Further, according to the present invention, the expansion ratio is 1.00 to 1.00.
It is characterized by being 1.17 times.
【００１３】[0013]
【作用】この発明のアンテナ用誘電体レンズの製造方法
では、発泡射出成形において、発泡材料の充填量を金型
のキャビティの容量に対して８０重量％以上として、か
つ発泡材料の充填体積をキャビティの体積に対して同等
以上として、保圧が加えられる。すなわち、通常の射出
発泡成形条件ではなく、高圧射出成形条件下で成形が行
われる。In the method of manufacturing a dielectric lens for an antenna of the present invention, in the foam injection molding, the filling amount of the foam material is 80% by weight or more with respect to the capacity of the cavity of the mold, and the filling volume of the foam material is the cavity. The holding pressure is applied as equal to or more than the volume of. That is, molding is performed under high pressure injection molding conditions instead of normal injection foam molding conditions.
【００１４】従って、上記保圧により、誘電体レンズ内
部における樹脂の凝固収縮が補償され、緻密な成形体が
得られる。また、発泡剤の発泡作用により、上記保圧に
よる補填不十分な凝固収縮分が補われ、さらに緻密さが
高まる。Therefore, due to the above holding pressure, the solidification shrinkage of the resin inside the dielectric lens is compensated for, and a dense molded body is obtained. In addition, due to the foaming action of the foaming agent, the insufficient solidification shrinkage due to the holding pressure is compensated for, and the compactness is further increased.
【００１５】また、充填された発泡材料は、発泡剤の発
泡作用により、保圧による補填不十分な凝固収縮分が補
われるが、発泡倍率は常に１．３倍以下とされる。In the filled foam material, the insufficient coagulation shrinkage due to the holding pressure is compensated by the foaming action of the foaming agent, but the expansion ratio is always 1.3 times or less.
【００１６】また、発泡材料の充填量を金型のキャビテ
ィの容量に対して約８０重量％以上として、かつ発泡材
料の充填体積をキャビティの体積に対して約同等以上と
して、保圧を加えること、及び発泡倍率を１．３倍以下
とすることを除いては、従来の発泡射出成形と同様にし
て成形が行われる。すなわち、使用する金型等について
は、従来の発泡射出成形に用いられていた比較的簡単な
構造の金型を用いることができる。Further, a holding pressure is applied such that the filling amount of the foam material is about 80% by weight or more with respect to the capacity of the cavity of the mold, and the filling volume of the foam material is about equal to or more than the volume of the cavity. Molding is performed in the same manner as conventional foaming injection molding except that the foaming ratio is 1.3 times or less. That is, as a mold to be used, a mold having a relatively simple structure used in conventional foam injection molding can be used.
【００１７】また、この発明の製造方法において、発泡
材料の充填量を、キャビティの容量に対して８５〜９１
重量％とした場合には、発泡材料の充填量が約８５重量
％以上であることから、アンテナ用誘電体レンズとして
必要な誘電率が確実に得られるとともに、発泡材料の充
填量が９１重量％以下であることから、バリの発生を防
止することができる。In the manufacturing method of the present invention, the filling amount of the foam material is 85 to 91 with respect to the capacity of the cavity.
When the weight percentage is set to about 85 wt% or more, the dielectric constant required for the antenna dielectric lens can be reliably obtained, and the foam amount is 91 wt% or more. From the following, it is possible to prevent the occurrence of burrs.
【００１８】また、この発明の製造方法において、発泡
倍率を１．００〜１．１７倍とした場合には、発泡倍率
が１．００以上であることから、発泡作用による樹脂の
凝固収縮が補償されるとともに、発泡倍率が１．１７倍
以下であることから、アンテナ用誘電体レンズとして必
要な誘電率が確実に得られる。Further, in the production method of the present invention, when the expansion ratio is 1.00 to 1.17 times, the expansion ratio is 1.00 or more, so that the solidification shrinkage of the resin due to the foaming action is compensated. In addition, since the foaming ratio is 1.17 times or less, the dielectric constant required for the antenna dielectric lens can be reliably obtained.
【００１９】[0019]
【実施例の説明】以下、本発明に係る誘電体レンズの製
造方法の実施例につき、添付図面を参照して説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the method for manufacturing a dielectric lens according to the present invention will be described below with reference to the accompanying drawings.
【００２０】まず、合成樹脂としてポリプロピレン（三
井石油化学社製、商品名：ＦＲ−ＰＰ、グレード：Ｋ７
０００）１００重量部に対して、グラスファイバ１０重
量部、発泡剤としてアゾジカルボンアミド（三菱油化社
製、商品名：ポリバン２０６０）０．５重量部を配合し
た発泡材料を調整した。発泡剤を合成樹脂に含有させる
方法としては、マスターバッチやコンパウンド等の適宜
な方法を採用し得る。First, as a synthetic resin, polypropylene (manufactured by Mitsui Petrochemical Co., Ltd., trade name: FR-PP, grade: K7
000) 100 parts by weight, and 10 parts by weight of glass fiber and 0.5 parts by weight of azodicarbonamide (manufactured by Mitsubishi Petrochemical Co., Ltd., trade name: Polyban 2060) as a foaming agent were mixed to prepare a foam material. As a method of incorporating the foaming agent into the synthetic resin, an appropriate method such as masterbatch or compound can be adopted.
【００２１】この発泡材料を、図１に示す上型１１及び
下型１２のキャビティ内に以下の条件で射出した。This foam material was injected into the cavities of the upper mold 11 and the lower mold 12 shown in FIG. 1 under the following conditions.
【００２２】上型温度： ２０度Ｃ 下型温度： ６０度Ｃ 射出圧力： １４４８ｋｇ／平方ｃｍ 射出速度： １１４立方ｃｍ／秒 その後、以下の条件で保圧を加え、発泡させた。Upper mold temperature: 20 ° C Lower mold temperature: 60 ° C Injection pressure: 1448 kg / square cm Injection speed: 114 cubic cm / sec After that, a holding pressure was applied under the following conditions to foam.
【００２３】保圧： ４３４．４ｋｇ／平方ｃｍ 保圧時間： ２０秒 保圧後の冷却時間： ５４０秒 前記発泡材料の射出に際しては、キャビティの容量に対
して８７．２重量％の割合で発泡材料を充填した。キャ
ビティの容量に対する充填量（重量％）とは、キャビテ
ィ体積に樹脂比重をかけたときの理論重量に対する実際
上の充填重量の比を意味する。また、発泡材料の充填体
積はキャビティの体積に対して同等以上であり、具体的
にはキャビティの体積２７０２．４立方ｃｍに対して２
７６３．２立方ｃｍの発泡材料が充填される。Holding pressure: 434.4 kg / cm <2> Holding time: 20 seconds Cooling time after holding pressure: 540 seconds When the foamed material was injected, it was foamed at a rate of 87.2% by weight with respect to the capacity of the cavity. The material was filled. The filling amount (% by weight) with respect to the capacity of the cavity means the ratio of the actual filling weight to the theoretical weight when the cavity volume is multiplied by the resin specific gravity. Further, the filling volume of the foam material is equal to or larger than the volume of the cavity, and specifically, it is 2 with respect to the volume of the cavity of 2702.4 cubic cm.
763.2 cubic cm of foam material is filled.
【００２４】以上のようにして得られた誘電体レンズ１
３を図２に示す。この誘電体レンズ１３では、表面にヒ
ケ、スワールマーク、内部にボイドは全く発生していな
かった。また、この誘電体レンズの各部分の誘電率を測
定したところ、全体にほぼ一定であることが確かめられ
た。また、誘電体レンズ１３の表面にヒケやスワールマ
ークが発生したり、内部にボイドが発生するといった欠
陥は認められなかった。Dielectric lens 1 obtained as described above
3 is shown in FIG. In this dielectric lens 13, sink marks, swirl marks, and voids were not generated on the surface at all. Also, when the dielectric constant of each part of this dielectric lens was measured, it was confirmed that it was almost constant throughout. In addition, defects such as sink marks and swirl marks on the surface of the dielectric lens 13 and voids inside were not recognized.
【００２５】以下の表１は、前述の条件の下で種々の発
泡倍率で発泡させた誘電体レンズのアンテナ利得（ｄ
Ｂ）を示す。アンテナ利得で評価した場合、発泡倍率を
１．３倍以下に設定した試作品番号１〜９の全てが必要
とするアンテナ利得を得ているが、発泡倍率を１．１７
倍以下に設定した試作品番号５〜９は、より良好なアン
テナ利得が得られた。Table 1 below shows the antenna gain (d) of the dielectric lens foamed at various foaming ratios under the above conditions.
B) is shown. When evaluated with the antenna gain, all of the prototype numbers 1 to 9 in which the expansion ratio is set to 1.3 times or less have obtained the antenna gain, but the expansion ratio is 1.17.
Prototype numbers 5 to 9 set to less than or equal to twice obtained better antenna gain.
【００２６】[0026]
【表１】 [Table 1]
【００２７】なお、この発明のアンテナ用誘電体レンズ
の製造方法は、上記実施例に限定されるものではなく、
この発明の要旨の範囲内で種々に変更ができる。The method for manufacturing a dielectric lens for an antenna according to the present invention is not limited to the above embodiment,
Various changes can be made within the scope of the present invention.
【００２８】上記実施例においては、合成樹脂材料とし
て、ポリプロピレンを用いたが、誘電体レンズを構成す
るのに十分な誘電率を発揮することができ、発泡射出成
形が可能なものであれば、種々の材料を用いることがで
きる。例えば、ポリプロピレン以外では、ポリエチレ
ン、ポリスチレン、ポリブチレンテレフヌレート、ＡＢ
Ｓ樹脂等を用いることができる。また、これらの合成樹
脂材料に誘電体セラミックやガラスファイバー等を混合
した複合材料を用いても良い。In the above embodiments, polypropylene was used as the synthetic resin material, but any material capable of exhibiting a dielectric constant sufficient for forming a dielectric lens and capable of foam injection molding can be used. Various materials can be used. For example, except polypropylene, polyethylene, polystyrene, polybutylene terefunurate, AB
S resin or the like can be used. Further, a composite material in which a dielectric ceramic, glass fiber or the like is mixed with these synthetic resin materials may be used.
【００２９】また、上記実施例においては、発泡済とし
て、合成樹脂に対し０．５重量部のアゾジカルボンアミ
ドを用いたが、これ以外の発泡剤、例えば炭酸ガス系、
Ｐ，Ｐ−オキシベンゼンスルゴニルヒドラジド等を用い
ても良い。発泡剤の配合割合は、誘電体レンズの目的と
する密度に応じて異なるが、通常、合成樹脂に対して
０．０５〜３．０重量％の範囲である。発泡剤の配合割
合が０．０５重量％未満では、発泡による欠陥発生防止
効果が十分でなく、３．０重量％を越えて配合した場合
には保圧を加えても、発泡倍率が１．３倍を越え、誘電
性等の電気的特性の劣化が生じるからである。In the above examples, 0.5 part by weight of azodicarbonamide was used with respect to the synthetic resin as the foaming agent, but other foaming agents such as carbon dioxide gas,
You may use P, P- oxybenzene sulgonyl hydrazide etc. The blending ratio of the foaming agent varies depending on the intended density of the dielectric lens, but is usually in the range of 0.05 to 3.0% by weight based on the synthetic resin. If the blending ratio of the foaming agent is less than 0.05% by weight, the effect of preventing the occurrence of defects due to foaming is not sufficient, and if the blending ratio exceeds 3.0% by weight, the expansion ratio is 1. This is because the electrical characteristics such as the dielectric property are deteriorated by more than 3 times.
【００３０】また、発泡材料の射出に際しての発泡材料
の充填量は、上記実施例においてはキャビティの容量に
対して８７．２重量％の割合としたが、８０重量％以上
であれば良い。但し、８５〜９１重量％の範囲で充填す
る方がより好ましい。なぜなら、９１重量％を越える
と、現状の金型ではバリが発生して不良品となることが
あり、８５重量％未満であると、誘電率が低下して必要
なアンテナ利得が得られないことがあるからである。Further, the filling amount of the foam material at the time of injecting the foam material is 87.2% by weight with respect to the capacity of the cavity in the above-mentioned embodiment, but it may be 80% by weight or more. However, it is more preferable to fill in the range of 85 to 91% by weight. This is because if it exceeds 91% by weight, burrs may be generated in the current mold, resulting in a defective product. Because there is.
【００３１】また、発泡材料の充填体積は上記の実施例
では、キャビティの体積２７０２．４立方ｃｍに対して
２７６３．２立方ｃｍとしたが、キャビティの体積に対
して同等以上であれば良い。Further, the filling volume of the foamed material is 2763.2 cubic cm with respect to the cavity volume of 2702.4 cubic cm in the above embodiment, but may be equal to or larger than the cavity volume.
【００３２】さらに、発泡倍率は、射出条件により異な
るが、１．３倍以下であれば良く、１．００〜１．１７
倍の範囲内である方がより好ましい。１．１７倍を越え
ると誘電率が低下して必要なアンテナ利得が得られない
場合があり、１．００倍未満であると前記表面欠陥、内
部欠陥が生じる場合がある。Further, the foaming ratio varies depending on the injection conditions, but may be 1.3 times or less, and 1.00 to 1.17.
It is more preferable that it is within the double range. If it exceeds 1.17 times, the dielectric constant may decrease and the required antenna gain may not be obtained, and if it is less than 1.00 times, the surface defects and internal defects may occur.
【００３３】[0033]
【発明の効果】以上のように、この発明のアンテナ用誘
電体レンズの製造方法によれば、発泡成形において、保
圧により、誘電体レンズ内部における樹脂の凝固収縮が
補償されるとともに、保圧による補填不十分な凝固収縮
分は、発泡剤の発泡作用により補われることにより、緻
密な成形体が得られる。したがって、表面にヒケ、ある
いはスワールマークまた内部にボイドといった欠陥が発
生することがない。As described above, according to the method for manufacturing a dielectric lens for an antenna of the present invention, in foam molding, pressure retention compensates for solidification shrinkage of the resin inside the dielectric lens, and pressure retention. The solidification shrinkage that is insufficiently compensated by is compensated by the foaming action of the foaming agent, so that a dense molded body can be obtained. Therefore, a sink mark, a swirl mark, or a defect such as a void does not occur on the surface.
【００３４】また、充填された発泡材料は、発泡剤の発
泡作用により、保圧による補填不十分な凝固収縮分が補
われるが、発泡倍率は常に１．３倍以下とされるので、
誘電率やＱなどの電気的特性が均一なアンテナ用誘電体
レンズを得ることができる。In the filled foam material, the insufficient coagulation shrinkage due to the holding pressure is compensated by the foaming action of the foaming agent, but since the expansion ratio is always 1.3 times or less,
It is possible to obtain a dielectric lens for an antenna having uniform electric characteristics such as permittivity and Q.
【００３５】さらに、本発明の製造方法は、通常の射出
成形法の金型を用いて行い得るため、上記のような緻密
かつ欠陥のないアンテナ用誘電体レンズを安価に製造す
ることができる。Further, since the manufacturing method of the present invention can be carried out by using a mold of a usual injection molding method, the above-mentioned dense and defect-free dielectric lens for antenna can be manufactured at a low cost.
【００３６】また、発泡材料の充填量を、８５〜９１重
量％の範囲内とした場合には、必要な誘電率が確実に得
られ、良好なアンテナ利得が得られるとともに、バリの
発生を防止でき良品率が高まる。When the filling amount of the foamed material is within the range of 85 to 91% by weight, the required dielectric constant can be reliably obtained, good antenna gain can be obtained, and burrs can be prevented. Good quality rate increases.
【００３７】また、発泡倍率を、１．００〜１．１７倍
の範囲内とした場合には、発泡作用による樹脂の凝固収
縮が補償され、表面欠陥および内部欠陥の発生を防止で
きるとともに、必要な誘電率が確実に得られ、良好なア
ンテナ利得が得られる。When the expansion ratio is set in the range of 1.00 to 1.17 times, the solidification shrinkage of the resin due to the foaming action is compensated for, and the occurrence of surface defects and internal defects can be prevented and necessary. Dielectric constant is reliably obtained, and good antenna gain is obtained.
【図１】実施例において金型内で発泡剤材料を成形する
工程を説明するための断面図。FIG. 1 is a cross-sectional view for explaining a process of molding a foaming agent material in a mold in an example.
【図２】実施例で得られたアンテナ用誘電体レンズを示
す断面図。FIG. 2 is a sectional view showing a dielectric lens for an antenna obtained in an example.
【図３】通常の射出成形で得られたアンテナ用誘電体レ
ンズの欠陥を説明するための断面図。FIG. 3 is a cross-sectional view for explaining a defect of a dielectric lens for an antenna obtained by ordinary injection molding.
【図４】従来の製造方法において用いられる金型を説明
するための断面図。FIG. 4 is a sectional view for explaining a mold used in a conventional manufacturing method.
【図５】従来の射出圧縮成形法により得られたアンテナ
用誘電体レンズを示す断面図。FIG. 5 is a sectional view showing a dielectric lens for an antenna obtained by a conventional injection compression molding method.
【図６】従来のストラクチュラルフォーム成形法で得ら
れたアンテナ用誘電体レンズの断面図。FIG. 6 is a cross-sectional view of a dielectric lens for an antenna obtained by a conventional structural foam molding method.
１１ 上型 １２ 下型 １３ アンテナ用誘電体レンズ 11 Upper mold 12 Lower mold 13 Dielectric lens for antenna
Claims (3)
材料を成形金型内に充填し、保圧を加えて発泡成形する
に際し、発泡材料の充填量は金型のキャビティの容量に
対して８０重量％以上であり、発泡材料の充填体積はキ
ャビティの体積に対して同等以上であり、かつ、発泡倍
率は１．３倍以下であることを特徴とするアンテナ用誘
電体レンズの製造方法。1. When a foaming material made of a synthetic resin containing a foaming agent is filled in a molding die and a holding pressure is applied to carry out foaming molding, the filling amount of the foaming material is relative to the capacity of the cavity of the die. 80% by weight or more, the filling volume of the foam material is equal to or more than the volume of the cavity, and the expansion ratio is 1.3 times or less, The manufacturing method of a dielectric lens for an antenna.
に対して８５〜９１重量％であることを特徴とする請求
項１に記載のアンテナ用誘電体レンズの製造方法。2. The method for manufacturing a dielectric lens for an antenna according to claim 1, wherein the filling amount of the foam material is 85 to 91% by weight with respect to the capacity of the cavity.
ることを特徴とする請求項１又は２に記載のアンテナ用
誘電体レンズの製造方法。3. The method of manufacturing a dielectric lens for an antenna according to claim 1, wherein the expansion ratio is 1.00 to 1.17 times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6328108A JPH08186434A (en) | 1994-12-28 | 1994-12-28 | Manufacture of dielectric lens for antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6328108A JPH08186434A (en) | 1994-12-28 | 1994-12-28 | Manufacture of dielectric lens for antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08186434A true JPH08186434A (en) | 1996-07-16 |
Family
ID=18206590
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6328108A Pending JPH08186434A (en) | 1994-12-28 | 1994-12-28 | Manufacture of dielectric lens for antenna |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08186434A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6592788B1 (en) | 1993-06-30 | 2003-07-15 | Murata Manufacturing Co., Ltd. | Method of manufacturing a dielectric lens for an antenna |
| US7301504B2 (en) | 2004-07-14 | 2007-11-27 | Ems Technologies, Inc. | Mechanical scanning feed assembly for a spherical lens antenna |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53136700A (en) * | 1977-05-02 | 1978-11-29 | Tokyo Keiki Kk | Lighttweight mixed dielectric and method of manufacturing same |
| JPH0243260A (en) * | 1988-08-04 | 1990-02-13 | Polyplastics Co | Expandable polyarylene sulfide resin molding material, expansion molding thereof and production of said molding |
| JPH03104402A (en) * | 1989-09-19 | 1991-05-01 | Murata Mfg Co Ltd | Dielectric lens antenna |
| JPH0479403A (en) * | 1990-07-18 | 1992-03-12 | Murata Mfg Co Ltd | Lens antenna forming method |
| JPH04326605A (en) * | 1991-04-26 | 1992-11-16 | Murata Mfg Co Ltd | Lens antenna |
| JPH0548318A (en) * | 1991-08-20 | 1993-02-26 | Murata Mfg Co Ltd | Lens antenna |
| JPH066126A (en) * | 1992-06-19 | 1994-01-14 | Murata Mfg Co Ltd | Manufacture of thick resin lens antenna |
-
1994
- 1994-12-28 JP JP6328108A patent/JPH08186434A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53136700A (en) * | 1977-05-02 | 1978-11-29 | Tokyo Keiki Kk | Lighttweight mixed dielectric and method of manufacturing same |
| JPH0243260A (en) * | 1988-08-04 | 1990-02-13 | Polyplastics Co | Expandable polyarylene sulfide resin molding material, expansion molding thereof and production of said molding |
| JPH03104402A (en) * | 1989-09-19 | 1991-05-01 | Murata Mfg Co Ltd | Dielectric lens antenna |
| JPH0479403A (en) * | 1990-07-18 | 1992-03-12 | Murata Mfg Co Ltd | Lens antenna forming method |
| JPH04326605A (en) * | 1991-04-26 | 1992-11-16 | Murata Mfg Co Ltd | Lens antenna |
| JPH0548318A (en) * | 1991-08-20 | 1993-02-26 | Murata Mfg Co Ltd | Lens antenna |
| JPH066126A (en) * | 1992-06-19 | 1994-01-14 | Murata Mfg Co Ltd | Manufacture of thick resin lens antenna |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6592788B1 (en) | 1993-06-30 | 2003-07-15 | Murata Manufacturing Co., Ltd. | Method of manufacturing a dielectric lens for an antenna |
| US7301504B2 (en) | 2004-07-14 | 2007-11-27 | Ems Technologies, Inc. | Mechanical scanning feed assembly for a spherical lens antenna |
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