JP2970731B2 - Deployable antenna reflector - Google Patents
Deployable antenna reflectorInfo
- Publication number
- JP2970731B2 JP2970731B2 JP28346293A JP28346293A JP2970731B2 JP 2970731 B2 JP2970731 B2 JP 2970731B2 JP 28346293 A JP28346293 A JP 28346293A JP 28346293 A JP28346293 A JP 28346293A JP 2970731 B2 JP2970731 B2 JP 2970731B2
- Authority
- JP
- Japan
- Prior art keywords
- cable network
- cable
- deployable antenna
- metal mesh
- antenna reflector
- 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.)
- Expired - Lifetime
Links
Landscapes
- Aerials With Secondary Devices (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は、人工衛星等の宇宙機
器に搭載される展開型アンテナの反射鏡に関するもので
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reflector for a deployable antenna mounted on space equipment such as an artificial satellite.
【０００２】[0002]
【従来の技術】宇宙用のアンテナ反射鏡は、宇宙利用の
拡大に伴いより大型な物が要求されてきているが、打ち
上げ時のランチャの収納スペースに限りがあるため小さ
く畳んだ状態で打ち上げ、宇宙空間で展開する方式が検
討されている。図４は、従来検討されてきた展開型アン
テナ反射鏡面の一例を示すものであり、図において１は
反射鏡面を構成する折り畳み可能な金属メッシュ、２は
金属メッシュの形状を保持する折り畳み可能なケーブル
ネットワーク、３は上記金属メッシュとケーブルネット
ワークを軌道上で展開し、展開後に上記金属メッシュと
ケーブルネットワークを保持する展開構造、４は複数の
ケーブルを集めて結合する結合子である。ケーブルネッ
トワークの材質は、線膨張率が小さく、強度と剛性が高
いケブラーコードで、構成は金属メッシュを鏡面の形状
に押え込む為に三角形状に張り巡らされた鏡面側ケーブ
ルネットワークと、その鏡面側ケーブルネットワークを
裏側に引っ張るタイケーブル、及びそのタイケーブルの
他端を支え鏡面側と同様に三角形状に張り巡らされた背
面側ケーブルネットワークから構成され、鏡面側のケー
ブルネットワークは金属メッシュに縫い込まれた状態で
一体化している。このアンテナは、直径２ｍ〜４ｍ程度
のロケットフェアリング内に収納され、打ち上げ後軌道
上で展開する。その際のケーブルネットワークの絡みは
アンテナの展開に致命的な結果を与える。絡みの例とし
ては、結合子が他のケーブルに対して本来有るべき位置
とは反対側に行ってしまいそれが正しい位置に戻る前に
他のケーブルが張ってしまって戻れなくなってしまった
り、ケーブルがそれ自身又は他のケーブルと結び目を作
るような形で拘束し合い、張架されてもその拘束が解け
ないようなケースなどが有る。それらの対策として、最
も絡みが生じ易い背面側の結合子回りを部分的にポリイ
ミドフィルムの膜で被い、結合子と他のケーブルの位置
関係が入れ変らないようにしたり、ケーブルの長さを極
力短くしたり本数を減らしたりして絡みの発生を減らす
ことが行われてきた。2. Description of the Related Art An antenna reflector for space has been required to have a larger size with the expansion of space use. However, since the launcher has a limited storage space at launch, it is launched in a small folded state. A method of deploying in outer space is being studied. FIG. 4 shows an example of a deployable antenna reflecting mirror surface that has been conventionally studied. In FIG. 4, reference numeral 1 denotes a foldable metal mesh forming the reflecting mirror surface, and 2 denotes a foldable cable that retains the shape of the metal mesh. The network 3 is a deployment structure that deploys the metal mesh and the cable network on a track and holds the metal mesh and the cable network after the deployment, and 4 is a connector that collects and connects a plurality of cables. The cable network is made of Kevlar cord, which has a low coefficient of linear expansion and high strength and rigidity.The structure consists of a mirror-side cable network stretched in a triangular shape to press the metal mesh into a mirror-like shape, and the mirror-side cable network. It consists of a tie cable that pulls the cable network to the back side, and a back side cable network that supports the other end of the tie cable and stretches in a triangular shape like the mirror side, and the mirror side cable network is sewn into metal mesh. Integrated. This antenna is housed in a rocket fairing having a diameter of about 2 m to 4 m, and is deployed in orbit after launch. The entanglement of the cable network in that case has a fatal consequence on the deployment of the antenna. Examples of entanglements are that the connector goes to the opposite side of the other cable from where it should be and the other cable is stretched out before it returns to the correct position and cannot be returned. There are cases in which the cables are bound in such a way as to tie a knot with itself or another cable, and the cables cannot be released even if the cables are stretched. As a countermeasure, partially cover the area around the connector on the rear side where entanglement is most likely to occur with a polyimide film film so that the positional relationship between the connector and other cables is not changed, or the length of the cable is reduced. Attempts have been made to reduce the occurrence of entanglement by shortening or reducing the number as much as possible.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、結合子
回りを部分的に膜で被った場合でも、その膜のうちケー
ブルに結合されていない辺の部分がよじれて他のケーブ
ルや結合子と絡み合ってしまったり、又、ケーブルの長
さを極力短くしたり本数を減らしたりしてもケーブルが
有る以上ケーブルがそれ自身又は他のケーブルと結び目
を作るような絡みは依然として発生し得るので、展開型
アンテナ反射境の展開信頼性を著しく下げると供に、ア
ンテナ反射鏡面の大型化に対する大きな制約と成ってい
る。However, even when the area around the connector is partially covered with a film, a portion of the film which is not connected to the cable is twisted and entangled with another cable or connector. Even if the length of the cable is shortened or the number of cables is reduced as much as possible, the entanglement that the cable ties to itself or other cables can still occur as long as the cable is present, so the deployable antenna In addition to significantly lowering the reliability of deployment of the reflection boundary, this is a great constraint on the enlargement of the reflector surface of the antenna.
【０００４】この発明は上記のような課題を解消するた
めになされたもので、反射鏡面が大型化してケーブルの
本数が増加したり長さが長くなったりしても、高い信頼
性で展開可能な展開型アンテナ反射鏡を得ることを目的
とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and can be deployed with high reliability even if the number of cables is increased or the length is increased due to an increase in the size of the reflecting mirror surface. It is intended to obtain a simple deployable antenna reflector.
【０００５】[0005]
【課題を解決するための手段】この発明に係わる展開型
アンテナ反射鏡は、鏡面のメッシュの形状を保持するケ
ーブルネットワークのケーブル間の全体もしくは一部分
にケーブルで周囲を囲まれる形で張られた平織り状の繊
維織布、網目状の編物、高分子材料のフィルムの膜面を
設けたものである。SUMMARY OF THE INVENTION A deployable antenna reflector according to the present invention is a plain weave which is stretched so as to be entirely or partially surrounded by cables between cables of a cable network which retains the shape of the mesh of the mirror surface. It is provided with a membrane surface of a fibrous woven fabric, a net-like knitted fabric, or a film of a polymer material.
【０００６】[0006]
【作用】平織り上の繊維織布を膜面に利用した展開型ア
ンテナ反射鏡においては、ケーブルネットワーク内の各
ケーブルが、収納状態及び展開途中においては１枚の膜
面として挙動するため、膜面が無い場合に発生するよう
なケーブルとしての絡みは発生しなくなる。また、膜面
の面内剛性を高くすることができるため展開後にケーブ
ルネットワークと供に剛性部材としてアンテナ反射鏡面
全体の形状の安定に寄与することができる。In a deployable antenna reflector using a plain woven fiber woven fabric for the film surface, each cable in the cable network behaves as a single film surface in the stored state and during deployment. The entanglement as a cable which would occur when no cable is present does not occur. Further, since the in-plane rigidity of the film surface can be increased, it can contribute to the stability of the shape of the entire antenna reflecting mirror surface as a rigid member together with the cable network after deployment.
【０００７】また、網目状の編物を膜面に利用した展開
型アンテナ反射鏡においても、収納状態及び展開途中に
おいての絡みの発生は無くなる。また、網目状の編物を
用いた膜面は面内剛性を非常に小さくすることができる
ため、展開後のケーブルネットワークの釣合形状に影響
を与えること無く張架することができる。[0007] Further, even in a deployable antenna reflector using a mesh-shaped knitted fabric for the film surface, the occurrence of entanglement in the housed state and during deployment is eliminated. In addition, since the membrane surface using the mesh-shaped knitted fabric can have extremely small in-plane rigidity, it can be stretched without affecting the balanced shape of the deployed cable network.
【０００８】また、高分子材料のフィルムを膜面に利用
した展開型アンテナ反射鏡においても、収納状態及び展
開途中においての絡みの発生は無くなる。また、高分子
材料を用いた膜面は軽量化できると供に反射面の軌道上
における熱変形を押える為の熱制御材としても利用でき
る。Further, even in the case of a deployable antenna reflector using a film of a polymer material for the film surface, the occurrence of entanglement in the housed state and during deployment is eliminated. In addition, the film surface made of a polymer material can be used as a heat control material for suppressing thermal deformation of the reflecting surface on the orbit when the film surface can be reduced in weight.
【０００９】[0009]
【実施例】実施例１．図１はこの発明の第１の特許請求
項に係わる展開型アンテナ反射鏡の一実施例を示す図で
ある。図において、１は金属メッシュ、２はケーブルネ
ットワーク、３は展開構造、４は結合子、５は膜面であ
る。図２はこの展開型アンテナ反射鏡の展開状態での断
面図であり、金属メッシュ１、ケーブルネットワーク
２、展開構造３、および膜面５の配置の例を示す図であ
る。図３はこの展開型アンテナ反射鏡の収納状態での断
面図であり、金属メッシュ１、ケーブルネットワーク
２、および膜面５が折り畳まれた形状の例を示す図であ
る。この展開型アンテナ反射鏡は収納状態でランチャに
搭載され、軌道上に打ち上げられてから展開構造３によ
って大口径に展開される。収納状態および展開途中にお
いては、ケーブルネットワークは膜面と一体に面として
挙動するため絡みが発生する可能性は極端に小さくな
る。また、平織り状の繊維織布は繊維を格子状に織った
だけなので繊維方向には繊維の剛性とほぼ同じ剛性が得
られる為、ケブラー繊維のような高剛性繊維の平織り状
繊維織布を膜面に選べば、面内剛性を高くできるため展
開後はケーブルネットワークと供に鏡面の形状を保持す
る構造部材の１部とすることができる。[Embodiment 1] FIG. 1 is a view showing one embodiment of a deployable antenna reflector according to the first claim of the present invention. In the figure, 1 is a metal mesh, 2 is a cable network, 3 is a deployed structure, 4 is a connector, and 5 is a membrane surface. FIG. 2 is a sectional view of the deployed antenna reflector in a deployed state, and is a diagram showing an example of the arrangement of the metal mesh 1, the cable network 2, the deployed structure 3, and the membrane surface 5. FIG. 3 is a cross-sectional view of the deployed antenna reflector in a housed state, and shows an example of a shape in which the metal mesh 1, the cable network 2, and the membrane surface 5 are folded. The deployable antenna reflector is mounted on the launcher in a housed state, is launched on an orbit, and is deployed to a large diameter by the deployable structure 3. The cable network behaves as a surface integrally with the membrane surface during the storage state and during deployment, so that the possibility of entanglement is extremely small. In addition, since plain woven fiber woven fabric is made by weaving the fibers in a lattice pattern, almost the same rigidity as the fiber is obtained in the fiber direction. If the surface is selected, in-plane rigidity can be increased, so that after deployment, it can be a part of a structural member that retains the mirror surface shape together with the cable network.
【００１０】実施例２．また、たとえばケーブルネット
ワークの張力状態が非常に微妙な釣合状態で成り立って
おり、ほんの少しの張力変化でケーブルが緩んでしまう
恐れのある展開型アンテナ反射鏡の場合、ケーブルネッ
トワークの張力状態に対する膜面の影響を極力小さくす
る必要がある。本例では膜面に面内剛性の小さい網目状
の編物を用いることによって、非常に小さな力で膜面を
張架することを可能にし、ケーブルネットワークの張力
状態に与える影響を小さく押えている。編目状の編物
は、繊維をループ状に編んでいるため、面内に荷重をか
けた場合、このループが変形して伸びるので、使用する
繊維の軸方向剛性にあまり影響されずに面内剛性の低い
膜を得ることができるのである。Embodiment 2 FIG. Further, for example, in the case of a deployable antenna reflector in which the tension state of the cable network is in a very delicate balance state and the cable may be loosened by a slight change in tension, a film for the tension state of the cable network is required. It is necessary to minimize the influence of the surface. In this example, by using a mesh-like knitted fabric having a small in-plane rigidity for the membrane surface, the membrane surface can be stretched with a very small force, and the influence on the tension state of the cable network is suppressed to a small extent. The stitch-shaped knitted fabric is formed by knitting the fibers into a loop, so when a load is applied in the plane, the loop is deformed and stretched, so the in-plane rigidity is not significantly affected by the axial rigidity of the fiber used. Thus, a film having a low density can be obtained.
【００１１】実施例３．また、重量の制約が非常に厳し
く、強く軽量化が求められていたり、軌道上で人工衛星
本体等の影などにより局所的に温度が違う点が生じ、そ
れによる熱変形がアンテナの性能に大きく影響を与える
ような場合がある。本例では、膜面を高分子材料のフィ
ルムであるポリイミドフィルムにすることによって、軽
量化を計り、かつ太陽光の直接照射を防ぐことによっ
て、局所的な温度変化を生じにくくし、熱変形を押えて
いる。ポリイミドフィルムは、厚さ２５μｍの物で面密
度５×１０-3ｇ／ｃｍ2 程度と軽く、又面内の熱伝導率
が６×１０-4ｃａｌ／ｓ・ｃｍ・℃程度と小さいため熱
制御材として非常に有効である。Embodiment 3 FIG. In addition, weight restrictions are very strict, and strong weight reduction is required, and there is a point where the temperature differs locally due to the shadow of the satellite body etc. in orbit, and the thermal deformation due to this greatly affects the performance of the antenna. May have an effect. In this example, the film surface is made of a polyimide film, which is a polymer material film, to reduce the weight and to prevent direct irradiation of sunlight, thereby making it difficult for local temperature changes to occur and reducing thermal deformation. I'm holding it down. The polyimide film is 25 μm thick and has a light area density of about 5 × 10 −3 g / cm 2 and an in-plane thermal conductivity of about 6 × 10 −4 cal / s · cm · ° C. Very effective as a control material.
【００１２】[0012]
【発明の効果】この発明に係わる展開型アンテナ反射鏡
によれば、ケーブルネットワーク間に張られた膜面によ
って、ケーブルネットワーク内のケーブルの本数を少な
くしたり長さを短くすることなく絡みを防止することが
でき、反射鏡を大型化しても確実に展開する性能を得る
ことができる。According to the deployable antenna reflector according to the present invention, entanglement is prevented by the film surface stretched between the cable networks without reducing the number of cables in the cable network or reducing the length thereof. Thus, even if the size of the reflecting mirror is increased, it is possible to obtain the performance of reliable deployment.
【図１】この発明に係わる展開型アンテナ反射鏡の実施
例を示す図である。FIG. 1 is a diagram showing an embodiment of a deployable antenna reflecting mirror according to the present invention.
【図２】この発明に係わる展開型アンテナ反射鏡の展開
状態の部分断面図である。FIG. 2 is a partial cross-sectional view of a deployed antenna reflector according to the present invention in a deployed state.
【図３】この発明に係わる展開型アンテナ反射鏡の収納
状態の部分断面図である。FIG. 3 is a partial cross-sectional view of a stored state of the deployable antenna reflector according to the present invention.
【図４】従来の展開型アンテナ反射鏡の例を示す図であ
る。FIG. 4 is a diagram showing an example of a conventional deployable antenna reflector.
１ 金属メッシュ ２ ケーブルネットワーク ３ 展開構造 ４ 結合子 ５ 膜面 DESCRIPTION OF SYMBOLS 1 Metal mesh 2 Cable network 3 Deployment structure 4 Connector 5 Membrane surface
Claims (4)
ッシュと、上記金属メッシュの形状を保持するケーブル
ネットワークとを有し、かつ上記金属メッシュとケーブ
ルネットワークを折り畳んだ状態から展開し、展開後は
上記金属メッシュとケーブルネットワークを保持する展
開構造を有する展開型アンテナにおいて、上記ケーブル
ネットワーク間の全体もしくは一部分にケーブルで周囲
を囲まれる形で張られた膜面を有することを特徴とする
展開型アンテナ反射鏡。1. A metal mesh forming a radio wave reflection surface of an antenna, and a cable network retaining the shape of the metal mesh, and the metal mesh and the cable network are deployed from a folded state. A deployable antenna having a deployable structure for holding a metal mesh and a cable network, wherein the deployable antenna has a membrane surface stretched so as to be surrounded by a cable in the whole or a part of the cable network. Reflector.
を特徴とする請求項１記載の展開型アンテナ反射鏡。2. The deployable antenna reflector according to claim 1, wherein a plain woven fiber woven fabric is used for the film surface.
とする請求項１記載の展開型アンテナ反射鏡。3. The deployable antenna reflector according to claim 1, wherein a net-like knitted fabric is used for the film surface.
とを特徴とする請求項１記載の展開型アンテナ反射鏡。4. The deployable antenna reflector according to claim 1, wherein a polymer material film is used for the film surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28346293A JP2970731B2 (en) | 1993-11-12 | 1993-11-12 | Deployable antenna reflector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28346293A JP2970731B2 (en) | 1993-11-12 | 1993-11-12 | Deployable antenna reflector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07142924A JPH07142924A (en) | 1995-06-02 |
| JP2970731B2 true JP2970731B2 (en) | 1999-11-02 |
Family
ID=17665862
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28346293A Expired - Lifetime JP2970731B2 (en) | 1993-11-12 | 1993-11-12 | Deployable antenna reflector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2970731B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4876941B2 (en) * | 2007-01-31 | 2012-02-15 | 三菱電機株式会社 | Deployable antenna |
| US8508430B2 (en) * | 2010-02-01 | 2013-08-13 | Harris Corporation | Extendable rib reflector |
-
1993
- 1993-11-12 JP JP28346293A patent/JP2970731B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07142924A (en) | 1995-06-02 |
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