JP2000182446A - Coaxial cable - Google Patents
Coaxial cableInfo
- Publication number
- JP2000182446A JP2000182446A JP10357215A JP35721598A JP2000182446A JP 2000182446 A JP2000182446 A JP 2000182446A JP 10357215 A JP10357215 A JP 10357215A JP 35721598 A JP35721598 A JP 35721598A JP 2000182446 A JP2000182446 A JP 2000182446A
- Authority
- JP
- Japan
- Prior art keywords
- insulator
- inner conductor
- string
- polyethylene
- conductor
- 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
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、同軸ケーブルに関
する。[0001] The present invention relates to a coaxial cable.
【０００２】[0002]
【従来の技術】従来から、銅管から成る内部導体と、円
筒状空隙部をもって該内部導体に外嵌される銅管から成
る外部導体と、上記円筒状空隙部に充填された発泡ポリ
エチレンから成る絶縁体と、を備えた同軸ケーブルが広
く使用されていた。2. Description of the Related Art Conventionally, an inner conductor made of a copper tube, an outer conductor made of a copper tube fitted to the inner conductor with a cylindrical gap, and a foamed polyethylene filled in the cylindrical gap are used. Coaxial cables with insulators have been widely used.
【０００３】[0003]
【発明が解決しようとする課題】ところで、絶縁体は、
ポリエチレンを円筒状空隙部内に押出して（充填して）
その内部で発泡させることにより形成されるが、大径
（例えば、 100mm前後）の同軸ケーブルを作製する場
合、内部導体と外部導体との隙間が大きいため、円筒状
空隙部内でポリエチレンを十分に発泡させることが困難
乃至不可能であった。By the way, the insulator is
Extrude (fill) polyethylene into the cylindrical void
It is formed by foaming inside, but when producing a large-diameter (for example, about 100 mm) coaxial cable, the gap between the inner conductor and the outer conductor is large, so polyethylene is sufficiently foamed in the cylindrical gap. It was difficult or impossible.
【０００４】そのため、大径の同軸ケーブルの場合は、
内部導体にポリスチロールテープを螺旋状に、かつ、厚
みをつけるために何重にも重ねて巻付けて絶縁体を形成
し、その上から外部導体にて外嵌して作製するようにし
ていた。しかしながら、この場合、絶縁体を形成するの
に大変手間がかかり、作業能率が悪いという問題があっ
た。Therefore, in the case of a large-diameter coaxial cable,
A polystyrene tape was spirally wound around the inner conductor, and was wound in layers to form an insulator to increase the thickness, and an insulator was formed on the insulator, and the outer conductor was fitted over the outer conductor from above. . However, in this case, there is a problem that it takes a lot of trouble to form the insulator and the working efficiency is poor.
【０００５】そこで、本発明は、能率良く作製でき、か
つ、大径品を得ることができる同軸ケーブルを提供する
ことを目的とする。Accordingly, an object of the present invention is to provide a coaxial cable which can be manufactured efficiently and can obtain a large-diameter product.
【０００６】[0006]
【課題を解決するための手段】上述の目的を達成するた
めに、本発明に係る同軸ケーブルは、内部導体と、円筒
状空隙部をもって該内部導体に外嵌される外部導体と、
上記円筒状空隙部に設けられた絶縁体と、を備えた同軸
ケーブルに於て、該絶縁体が、上記内部導体に螺旋状に
巻付けられた発泡プラスチックの紐状体から成る。ま
た、絶縁体の横断面形状が略円形である。In order to achieve the above-mentioned object, a coaxial cable according to the present invention comprises an inner conductor, an outer conductor fitted to the inner conductor with a cylindrical gap, and
A coaxial cable comprising: an insulator provided in the cylindrical gap; wherein the insulator comprises a string of foamed plastic spirally wound around the inner conductor. The cross-sectional shape of the insulator is substantially circular.
【０００７】[0007]
【発明の実施の形態】以下、実施の形態を示す図面に基
づき、本発明を詳説する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing embodiments.
【０００８】図１は、本発明の同軸ケーブルの実施の一
形態を示し、この同軸ケーブルは、内部導体１と、円筒
状空隙部Ｍをもって内部導体１に外嵌される外部導体２
と、円筒状空隙部Ｍに設けられた絶縁体３…と、を備え
ている。FIG. 1 shows an embodiment of a coaxial cable according to the present invention. This coaxial cable comprises an inner conductor 1 and an outer conductor 2 fitted externally to the inner conductor 1 with a cylindrical gap M.
And insulators 3 provided in the cylindrical gap M.
【０００９】内部導体１は、例えば、外径寸法Ｄ1 が36
mmの螺旋状波付銅管から成り、その外周面は絶縁層４
（例えばポリエチレン）にて密着状に外嵌被覆されてい
る。また、外部導体２は、例えば、外径寸法Ｄ2 が87mm
の螺旋状波付銅管から成り、その外周面の谷部は遮水コ
ンパウンド５にて埋められると共に、防食層６（例えば
ポリエチレン）にて外嵌被覆されている。なお、本実施
の形態では、防食層６を含むこの同軸ケーブルの外径寸
法Ｄは、約96mmと成る。The inner conductor 1 has, for example, an outer diameter D 1 of 36.
mm spiral copper tube with spiral corrugation
(For example, polyethylene) is tightly covered with the external fitting. The external conductor 2, for example, the outer diameter D 2 87 mm
The valleys on the outer peripheral surface are filled with a water-impervious compound 5 and covered with an anticorrosion layer 6 (for example, polyethylene). In the present embodiment, the outer diameter D of the coaxial cable including the anticorrosion layer 6 is about 96 mm.
【００１０】しかして、絶縁体３は、横断面形状が略円
形の発泡プラスチックの紐状体から成り、上記絶縁層４
を介して３本の絶縁体３…が内部導体１に螺旋状に巻付
けられている。具体的には、この紐状の絶縁体３は、細
いポリエチレン紐の上に発泡ポリエチレン紐を押し出す
方法によって形成されており、発泡率（ガスの重量部）
は45％〜80％である。The insulator 3 is made of a string of foamed plastic having a substantially circular cross-sectional shape.
Are wound spirally around the inner conductor 1 through the conductors. Specifically, the string-shaped insulator 3 is formed by extruding a foamed polyethylene string onto a thin polyethylene string, and has a foaming rate (part by weight of gas).
Is between 45% and 80%.
【００１１】本実施の形態では、３本の絶縁体３…を各
々略等間隔Ｌで、かつ、相互に重ならないように円筒状
空隙部Ｍ内に螺旋巻きされている。このとき、空隙部Ｍ
内に於て、外部導体２の谷部の内周面と、（絶縁層４を
介して）内部導体１の山部の外周面とに、各絶縁体３…
が弾発的に接しており、それによって横断面形状が略円
形から略楕円形に弾性変形して、各絶縁体３…は軸方向
の位置ずれが防止される。In the present embodiment, three insulators 3 are spirally wound in a cylindrical gap M at substantially equal intervals L so as not to overlap each other. At this time, the gap M
, The inner peripheral surface of the valley portion of the outer conductor 2 and the outer peripheral surface of the ridge portion of the inner conductor 1 (via the insulating layer 4).
Are resiliently contacted, whereby the cross-sectional shape is elastically deformed from a substantially circular shape to a substantially elliptical shape, thereby preventing the insulators 3 from being displaced in the axial direction.
【００１２】また、絶縁体３は横断面が略円形状に形成
されているので、内部導体１に絶縁体３を巻付ける際に
多少捩じれても、絶縁体３が内部導体１の波部と外部導
体２の波部に弾発的に接触する具合はほぼ均等となる。
つまり、仮に、絶縁体３を横断面矩形状に形成して螺旋
巻きしたとすると、捩じれによって絶縁体３が内部導体
１の外周面と外部導体２の内周面に弾発的に接触する具
合が不均一となり易い。本発明は、絶縁体３を横断面略
円形状にすることによりそれ（弾発的接触具合の不均
一）が解消される。また、横断面略円形状ならば絶縁体
３の作製が容易であるという利点もある。Further, since the insulator 3 is formed to have a substantially circular cross section, even if the insulator 3 is slightly twisted when the insulator 3 is wound around the inner conductor 1, the insulator 3 is kept in contact with the wave portion of the inner conductor 1. The degree of elastic contact with the wave portion of the outer conductor 2 is substantially uniform.
That is, assuming that the insulator 3 is formed in a rectangular cross section and spirally wound, the insulator 3 elastically contacts the outer peripheral surface of the inner conductor 1 and the inner peripheral surface of the outer conductor 2 due to torsion. Tends to be uneven. According to the present invention, by making the insulator 3 have a substantially circular cross-sectional shape, such a problem (nonuniformity of resilient contact) is solved. In addition, there is an advantage that the insulator 3 can be easily manufactured if the cross section is substantially circular.
【００１３】このように、紐状の絶縁体３…を円筒状空
隙部Ｍに螺旋状に設けることにより、内部導体１を外部
導体２の軸心位置に容易に保持でき、かつ、（絶縁層４
の厚みを含む）内部導体１と外部導体２との比較的大き
な隙間寸法Ｄ3 （例えば25mm前後）を十分に維持するこ
とができる。さらに、各絶縁体３…を略等間隔Ｌで螺旋
巻きしているため、各絶縁体３…の間にはエアー層が形
成されており、このエアー層によって誘電率のより一層
の低減を図ることができる。As described above, by providing the string-shaped insulators 3 spirally in the cylindrical gap M, the inner conductor 1 can be easily held at the axial center position of the outer conductor 2, and the (insulating layer) 4
The thickness D 3 (for example, around 25 mm) of the inner conductor 1 and the outer conductor 2 (including about 25 mm) can be sufficiently maintained. Further, since the insulators 3 are spirally wound at substantially equal intervals L, an air layer is formed between the insulators 3 to further reduce the dielectric constant. be able to.
【００１４】なお、本発明は上述の実施の形態に限定さ
れず、例えば、本実施の形態では、３本の絶縁体３を使
用した場合を例示したが、１本の絶縁体３でも良い。こ
の場合、螺旋巻きのピッチを小さくするのが好ましい。
また、絶縁体３は発泡ポリエチレンの他にも、例えば、
誘電率が低い発泡フッ素樹脂でも良い。The present invention is not limited to the above-described embodiment. For example, in the present embodiment, the case where three insulators 3 are used is exemplified, but one insulator 3 may be used. In this case, it is preferable to reduce the pitch of the spiral winding.
Further, the insulator 3 may be made of, for example, besides foamed polyethylene.
A foamed fluororesin having a low dielectric constant may be used.
【００１５】[0015]
【発明の効果】本発明は上述の如く構成されるので、次
に記載する効果を奏する。Since the present invention is configured as described above, the following effects can be obtained.
【００１６】（請求項１によれば）内部導体１と外部導
体２との隙間寸法Ｄ3 が大きくても、絶縁体３にてその
隙間を確実に維持して、内部導体１を外部導体２の軸心
位置に保持でき、大径の同軸ケーブル（外径寸法が約 1
00mm以上のもの）を容易かつ確実に得ることができる。
また、その製造を能率良く行うことができる。また、円
筒状空隙部Ｍ内の絶縁体３の無い部分にはエアー層が形
成されるため、このエアー層によって誘電率のより一層
の低減を図り得る。According to the first aspect, even if the gap dimension D 3 between the inner conductor 1 and the outer conductor 2 is large, the gap is reliably maintained by the insulator 3 so that the inner conductor 1 is connected to the outer conductor 2. Large diameter coaxial cable (with an outside diameter of about 1
00 mm or more) can be obtained easily and reliably.
Further, the production can be performed efficiently. Further, since an air layer is formed in a portion of the cylindrical gap M where the insulator 3 is not provided, the dielectric constant can be further reduced by the air layer.
【００１７】（請求項２によれば）絶縁体３が螺旋巻き
によって捩じれても、内部導体１と外部導体２への絶縁
体３の弾発的な接触具合はほぼ均等となり、それによっ
て絶縁体３が軸方向へ位置ずれしない。また、絶縁体３
の作製が容易となる。Even if the insulator 3 is twisted by the helical winding, the elastic contact of the insulator 3 with the inner conductor 1 and the outer conductor 2 becomes substantially equal, whereby the insulator 3 3 does not shift in the axial direction. In addition, insulator 3
Is easy to manufacture.
【図１】本発明の実施の一形態を示す断面図である。FIG. 1 is a cross-sectional view showing one embodiment of the present invention.
１ 内部導体 ２ 外部導体 ３ 絶縁体 Ｍ 円筒状空隙部 DESCRIPTION OF SYMBOLS 1 Internal conductor 2 External conductor 3 Insulator M Cylindrical void
───────────────────────────────────────────────────── フロントページの続き (72)発明者 渡辺 園生 福井県福井市白方町37字石塚割６−１ 三 菱電線工業株式会社福井製作所内 (72)発明者 松田 信義 福井県福井市白方町37字石塚割６−１ 三 菱電線工業株式会社福井製作所内 Ｆターム(参考） 5G319 FA10 FC10 FC15 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Sonio Watanabe 37-1, Ishizuka Wari 37, Shirakata-cho, Fukui City, Fukui Prefecture Inside the Fukui Works, Mitsubishi Electric Wire & Cable Co., Ltd. (72) Inventor Nobuyoshi Matsuda Shirakata, Fukui City, Fukui Prefecture 37-cho Ishizuka-wari, Machi-cho F-term (reference) in Fukui Works, Mitsubishi Electric Industries, Ltd. 5G319 FA10 FC10 FC15
Claims (2)
部導体に外嵌される外部導体と、上記円筒状空隙部に設
けられた絶縁体と、を備えた同軸ケーブルに於て、該絶
縁体が、上記内部導体に螺旋状に巻付けられた発泡プラ
スチックの紐状体から成ることを特徴とする同軸ケーブ
ル。1. A coaxial cable comprising: an inner conductor; an outer conductor externally fitted to the inner conductor with a cylindrical gap; and an insulator provided in the cylindrical gap. A coaxial cable, wherein the body comprises a string of foamed plastic spirally wound around the inner conductor.
項１記載の同軸ケーブル。2. The coaxial cable according to claim 1, wherein the cross section of the insulator is substantially circular.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10357215A JP2000182446A (en) | 1998-12-16 | 1998-12-16 | Coaxial cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10357215A JP2000182446A (en) | 1998-12-16 | 1998-12-16 | Coaxial cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000182446A true JP2000182446A (en) | 2000-06-30 |
Family
ID=18452976
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10357215A Pending JP2000182446A (en) | 1998-12-16 | 1998-12-16 | Coaxial cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000182446A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013051056A (en) * | 2011-08-30 | 2013-03-14 | Mitsubishi Cable Ind Ltd | Coaxial cable |
| WO2017172200A1 (en) * | 2016-04-01 | 2017-10-05 | Intel Corporation | Helically insulated twinax cable systems and methods |
| CN112700909A (en) * | 2020-12-17 | 2021-04-23 | 西安精密机械研究所 | Spring type buoyancy pressure-resistant cable, manufacturing method thereof and extrusion-generation type fuel cabin |
-
1998
- 1998-12-16 JP JP10357215A patent/JP2000182446A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013051056A (en) * | 2011-08-30 | 2013-03-14 | Mitsubishi Cable Ind Ltd | Coaxial cable |
| WO2017172200A1 (en) * | 2016-04-01 | 2017-10-05 | Intel Corporation | Helically insulated twinax cable systems and methods |
| CN112700909A (en) * | 2020-12-17 | 2021-04-23 | 西安精密机械研究所 | Spring type buoyancy pressure-resistant cable, manufacturing method thereof and extrusion-generation type fuel cabin |
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