JPH06275142A - Low noise coaxial cable - Google Patents
Low noise coaxial cableInfo
- Publication number
- JPH06275142A JPH06275142A JP5085250A JP8525093A JPH06275142A JP H06275142 A JPH06275142 A JP H06275142A JP 5085250 A JP5085250 A JP 5085250A JP 8525093 A JP8525093 A JP 8525093A JP H06275142 A JPH06275142 A JP H06275142A
- Authority
- JP
- Japan
- Prior art keywords
- sheath layer
- low noise
- coaxial cable
- layer
- insulating 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
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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
Landscapes
- Insulated Conductors (AREA)
- Organic Insulating Materials (AREA)
- Communication Cables (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、微弱信号を解折、判別
する機器に用いる低雑音同軸ケーブルに関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low noise coaxial cable used for a device for breaking and discriminating a weak signal.
【０００２】[0002]
【従来の技術】従来、内部導体上に絶縁層、導電層、外
部導体及びシース層をこの順に形成した同軸ケーブルに
おいては、耐熱性が要求される場合は、シース層に主と
してフッ素樹脂が用いられていた。2. Description of the Related Art Conventionally, in a coaxial cable in which an insulating layer, a conductive layer, an outer conductor and a sheath layer are formed on an inner conductor in this order, when heat resistance is required, a fluorine resin is mainly used for the sheath layer. Was there.
【０００３】また、シース層を２層とし、内側にシリコ
ーンゴム、外側にフッ素樹脂を配したものも提案されて
いる。It has also been proposed to use two sheath layers, with silicone rubber inside and fluororesin outside.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、このよ
うな従来の同軸ケーブルでは、最外層のシース層が硬く
なり、ケーブルを曲げた際にフッ素樹脂層が折れてしま
い、更には高価であるという問題がある。この傾向は、
コネクタ等の関係でシース層を厚くする必要がある場合
に特に顕著になる。However, in such a conventional coaxial cable, the sheath layer of the outermost layer becomes hard, the fluororesin layer is broken when the cable is bent, and it is expensive. There is. This trend is
This becomes particularly noticeable when it is necessary to thicken the sheath layer due to the connector and the like.
【０００５】従って、本発明の目的は、かかる従来技術
の問題点を解消し、耐熱性、低雑音性に優れていると共
に、シース層が柔軟で、ケーブルを曲げた際にもシース
層に折れが発生しない低雑音同軸ケーブルを提供するこ
とにある。Therefore, an object of the present invention is to solve the problems of the prior art, to have excellent heat resistance and low noise, and to have a flexible sheath layer so that the sheath layer can be bent even when the cable is bent. It is to provide a low-noise coaxial cable that does not generate noise.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するため
に、本発明によれば、内部導体上に絶縁層、外部導体及
びシース層をこの順に形成してなる同軸ケーブルにおい
て、該シース層を含フッ素エラストマーで組成物で形成
したことを特徴とする低雑音同軸ケーブルが提供され
る。In order to achieve the above object, according to the present invention, in a coaxial cable in which an insulating layer, an outer conductor and a sheath layer are formed in this order on an inner conductor, the sheath layer is formed. There is provided a low noise coaxial cable formed of a composition of a fluorine-containing elastomer.
【０００７】[0007]
【作用】本発明では、シース層に含フッ素エラストマー
組成物を用いているので、耐熱性に優れ、しかも柔軟で
あるため、曲げた場合でも折れるようなことがない。更
に，外部導体上に含フッ素エラストマーを直接被覆させ
ているので、外部導体の間隙にエラストマーが浸透し、
外部導体を強固に押さえつけるので、低雑音性も向上す
る。In the present invention, since the fluorine-containing elastomer composition is used for the sheath layer, it has excellent heat resistance and is flexible, so that it does not break even when bent. Furthermore, since the fluorine-containing elastomer is directly coated on the outer conductor, the elastomer penetrates into the gap of the outer conductor,
Since the outer conductor is firmly pressed down, low noise performance is also improved.
【０００８】図１は、本発明による低雑音同軸ケーブル
の一例を示す斜視図であり、内部導体１の外周に絶縁層
２を設け、この絶縁層２の外周に外部導体３を設け、更
にその外周にシース層４を被覆して低雑音同軸ケーブル
を構成している。内部導体１としては、特に限定はな
く、通常の芯線が用いられる。FIG. 1 is a perspective view showing an example of a low noise coaxial cable according to the present invention. An insulating layer 2 is provided on the outer periphery of an inner conductor 1, an outer conductor 3 is provided on the outer periphery of the insulating layer 2, and further, The outer periphery is covered with the sheath layer 4 to form a low noise coaxial cable. The inner conductor 1 is not particularly limited, and a normal core wire is used.
【０００９】絶縁層２としては、ポリテトラフルオロエ
チレン樹脂などのフッ素樹脂、ポリエチレン、ポリエス
テル、ポリアミド等の比誘電率が２．６以下の熱可塑性
ポリマーが用いられる。耐熱性、電気絶縁性の点で、フ
ッ素樹脂が特に好ましく用いられ、例えば、テトラフル
オロエチレン−パーフルオロアルキルビニルエーテル共
重合体（ＰＦＡ）、ポリテトラフルオロエチレン共重合
体（ＰＴＦＥ）、テトラフルオロエチレン−ヘキサフル
オロプロピレン共重合体（ＦＥＰ）、テトラフルオロエ
チレン−エチレン共重合体（ＥＴＦＥ）等のフッ素樹脂
を用いることができ、特にＰＴＦＥが好ましい。また、
外部導体３としては、通常の編組導体などを用いること
ができる。The insulating layer 2 is made of a fluororesin such as polytetrafluoroethylene resin, or a thermoplastic polymer having a relative dielectric constant of 2.6 or less such as polyethylene, polyester or polyamide. From the viewpoint of heat resistance and electric insulation, a fluororesin is particularly preferably used, and examples thereof include tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), polytetrafluoroethylene copolymer (PTFE), and tetrafluoroethylene- A fluororesin such as hexafluoropropylene copolymer (FEP) or tetrafluoroethylene-ethylene copolymer (ETFE) can be used, and PTFE is particularly preferable. Also,
A normal braided conductor or the like can be used as the outer conductor 3.
【００１０】本発明では、最外層のシース層４に含フッ
素エラストマー組成層を使用する。含フッ素エラストマ
ーとしては、例えば、テトラフルオロエチレン−プロピ
レン共重合体、フッ化ビニリデン−ヘキサフルオロプロ
ピレン共重合体、フッ化ビニリデン−ヘキサフルオロプ
ロピレン−テトラフルオロエチレン共重合体などを挙げ
ることができ、これらは、水性又は油性塗料として用い
ることもできる。In the present invention, a fluorine-containing elastomer composition layer is used for the outermost sheath layer 4. Examples of the fluorine-containing elastomer include tetrafluoroethylene-propylene copolymer, vinylidene fluoride-hexafluoropropylene copolymer, vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene copolymer, and the like. Can also be used as a water-based or oil-based paint.
【００１１】電線の外径を小さくすることに重点を置く
場合には、塗料状（液状）で含浸、浸漬するか又はスプ
レー塗装すればよい。この際、含フッ素エラストマー組
成物には、必要に応じて架橋剤、架橋助剤、充填剤、難
燃剤、帯電防止剤等を配合することができるが、電線の
使用条件下で揮発するような成分は使用しないように注
意する必要がある。When emphasis is placed on reducing the outer diameter of the electric wire, it may be impregnated in a paint form (liquid form), immersed, or spray-painted. At this time, the fluorine-containing elastomer composition can be blended with a crosslinking agent, a crosslinking aid, a filler, a flame retardant, an antistatic agent, etc., if necessary, but it may volatilize under the use conditions of the electric wire. Care must be taken not to use the ingredients.
【００１２】特に、含フッ素エラストマー組成物にカー
ボンブラック等の導電性物質を添加するなどして、シー
ス層４に導電性を付与しておくと、静電気障害（例えば
ゴミの付着等）を防止できるので好ましい。シース層４
の体積抵抗率は、１０10Ω−ｃｍ以下であることが好ま
しい。In particular, if the sheath layer 4 is made conductive by adding a conductive substance such as carbon black to the fluorine-containing elastomer composition, electrostatic damage (for example, adhesion of dust) can be prevented. Therefore, it is preferable. Sheath layer 4
The volume resistivity of is preferably 10 10 Ω-cm or less.
【００１３】また、最外層のシース層４を上記含フッ素
エラストマーからなる熱収縮チューブで構成することも
できる。熱収縮チューブを用いると、短尺アッセンブリ
ー品の場合、施工現場で簡単にシース層４を装着するこ
とができて便利であり、しかも外部導体３との密着性を
制御することができるため、外部導体３の編目がずれる
のを防ぐことができ、シールド効果の低下を防止するこ
とができる。Further, the outermost sheath layer 4 may be composed of a heat-shrinkable tube made of the above-mentioned fluorine-containing elastomer. If a heat-shrinkable tube is used, the sheath layer 4 can be easily attached at the construction site in the case of a short assembly product, and the adhesion with the outer conductor 3 can be controlled. It is possible to prevent the stitches of No. 3 from being displaced, and to prevent the shield effect from decreasing.
【００１４】更に、図２に示すように、内部導体１の外
周に設けた絶縁層２と外部導体３との間に、導電層５を
形成してもよい。この導電層５を設けることにより、信
号が微弱な場合の低雑音性が一段と向上する。導電層５
としては、導電性樹脂、導電テープ、導電塗料などが用
いられるが、特に、導電性フッ素樹脂又は導電性含フッ
素エラストマーが好適に用いられる。なお、図２におい
て、４は含フッ素エラストマー組成物からなるシース層
を示す。Further, as shown in FIG. 2, a conductive layer 5 may be formed between the insulating layer 2 provided on the outer periphery of the inner conductor 1 and the outer conductor 3. By providing the conductive layer 5, the low noise property when the signal is weak is further improved. Conductive layer 5
As the conductive material, a conductive resin, a conductive tape, a conductive paint or the like is used, and a conductive fluorine resin or a conductive fluorine-containing elastomer is particularly preferably used. In FIG. 2, 4 indicates a sheath layer made of a fluorine-containing elastomer composition.
【００１５】[0015]
【実施例】以下、実施例により本発明を更に詳細に説明
する。実施例１は、直径０．２９ｍｍの銀メッキ銅被鋼
線の単線からなる内部導体上に、ＰＴＦＥからなる絶縁
層を０．５５ｍｍの厚さに押出成形した後、直径０．１
ｍｍの銀メッキ軟銅線を用いて外部導体を編組し、その
上にフッ化ビニリデン−ヘキサフルオロプロピレン−テ
トラフルオロエチレン共重合体からなるシース層を形成
したところ、耐熱性、低雑音性に優れ、しかもシース層
が柔軟で、曲げたときにも折れが発生しない低雑音同軸
ケーブルが得られた。EXAMPLES The present invention will be described in more detail below with reference to examples. In Example 1, an insulating layer made of PTFE was extrusion-molded to a thickness of 0.55 mm on an inner conductor made of a single wire of a silver-plated copper steel wire having a diameter of 0.29 mm, and then a diameter of 0.15 mm was obtained.
When an outer conductor was braided using a silver-plated annealed copper wire of mm, and a sheath layer made of vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene copolymer was formed thereon, heat resistance and low noise were excellent, Moreover, a low noise coaxial cable was obtained in which the sheath layer was flexible and did not break even when bent.
【００１６】実施例２は、実施例１において、絶縁層と
外部導体の間にカーボンブラックを５．０重量％含有す
るＰＴＦＥからなる導電層を０．０２ｍｍの厚さに塗布
したところ、微弱信号における低雑音性が一段と向上し
た。In Example 2, a conductive signal layer made of PTFE containing 5.0% by weight of carbon black in a thickness of 0.02 mm was applied between the insulating layer and the outer conductor, and a weak signal was obtained. The low noise property in the is improved further.
【００１７】実施例３は、実施例１において、フッ化ビ
ニリデン−ヘキサフルオロプロピレン−テトラフルオロ
エチレン共重合体のかわりに、下記配合組成の導電性含
フッ素エラストマーを使用してシース層を形成したとこ
ろ、耐熱性、低雑音性に優れ、シース層が柔軟で曲げて
も折れが発生せず、しかもシース層の体積抵抗率は１０
6 〜１０8 Ω−ｃｍで、ほこりが付着するようなことも
なかった。In Example 3, a sheath layer was formed by using a conductive fluorine-containing elastomer having the following composition in place of the vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene copolymer used in Example 1. It has excellent heat resistance and low noise properties, and the sheath layer is flexible and does not bend even when bent, and the sheath layer has a volume resistivity of 10%.
It was 6 to 10 8 Ω-cm, and dust did not adhere to it.
【００１８】配合組成は、テクノフロン ＦＯＲ４２０
（モンテフルオス社製、フッ化ビニリデン−四フッ化エ
チレン共重合体）１００重量部、ＭｇＯ# １５０が３重
量部、Ｃａ（ＯＨ）2 が６重量部、アセチレン−カーボ
ンが３５重量部の導電性含フッ素エラストマーである。The compounding composition is Technoflon FOR420.
(Montefluos Co., vinylidene fluoride-tetrafluoroethylene copolymer) 100 parts by weight, MgO # 150 3 parts by weight, Ca (OH) 2 6 parts by weight, acetylene-carbon 35 parts by weight. It is a fluoroelastomer.
【００１９】上記配合組成の含フッ素エラストマーを２
５０℃で溶融混練し、４０ｍｍ押出機で押出して、内径
３ｍｍ、肉厚０．５ｍｍのチューブを成形し、２ＭｅＶ
の電子線加速器で１０Ｍｒａｄの電子線を照射した後、
加熱炉で１５０℃に加熱した。次いで、外径制御用ダイ
ス内でチューブ内に内圧をかけて、内径が５ｍｍとなる
ように膨張させた後、冷却して収縮チューブを得た。Two fluorine-containing elastomers having the above composition are used.
Melt kneading at 50 ° C, extruding with a 40 mm extruder to form a tube with an inner diameter of 3 mm and a wall thickness of 0.5 mm, and 2 MeV
After irradiating 10 Mrad electron beam with the electron beam accelerator of
It heated at 150 degreeC with the heating furnace. Next, internal pressure was applied to the tube in the outer diameter control die to expand the tube so that the inner diameter was 5 mm, and then the tube was cooled to obtain a shrink tube.
【００２０】この収縮チューブに、実施例１の電線から
フッ化ビニリデン−ヘキサフルオロプロピレン−テトラ
フルオロエチレン共重合体シース層を除去したものを通
し、１８０℃で５分間加熱して、収縮チューブを収縮さ
せた。The shrink tube was passed through the electric wire of Example 1 from which the vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene copolymer sheath layer had been removed, and heated at 180 ° C. for 5 minutes to shrink the shrink tube. Let
【００２１】得られた電線は、耐熱性、低雑音性に優
れ、柔軟で曲げたときに折れが発生せず、しかも外部導
体の編目がずれることなく、良好なシールド効果が得ら
れ、収縮チューブの装着も容易に行うことができた。The obtained electric wire is excellent in heat resistance and low noise, is flexible, does not break when bent, and has a good shielding effect without shifting the stitches of the outer conductor. It was easy to put on.
【００２２】[0022]
【発明の効果】本発明によれば、耐熱性、低雑音性に優
れていると共に、シース層が柔軟で、ケーブルを曲げた
際にもシース層に折れが発生しない低雑音同軸ケーブル
が得られる。According to the present invention, it is possible to obtain a low-noise coaxial cable which is excellent in heat resistance and low-noise property, has a flexible sheath layer, and is not bent in the sheath layer when the cable is bent. .
【００２３】また、シース層を含フッ素エラストマーか
らなる熱収縮チューブで構成すれば、施工現場で簡単に
シース層装着ができて便利であり、しかも外部導体の編
目がずれてシールド効果が低下するのを防ぐことができ
る。更に、シース層に導電性を付与しておけば、電線へ
のゴミ付着等の静電気障害を防止することができる。Further, if the sheath layer is composed of a heat-shrinkable tube made of a fluorine-containing elastomer, the sheath layer can be easily attached at the construction site, which is convenient, and the stitches of the outer conductor are displaced, so that the shielding effect is reduced. Can be prevented. Further, if the sheath layer is provided with conductivity, electrostatic damage such as adhesion of dust to the electric wire can be prevented.
【図１】本発明の同軸ケーブルの一例を示す斜視図であ
る。FIG. 1 is a perspective view showing an example of a coaxial cable of the present invention.
【図２】本発明の同軸ケーブルの他の例を示す斜視図で
ある。FIG. 2 is a perspective view showing another example of the coaxial cable of the present invention.
１ 内部導体 ２ 絶縁層 ３ 外部導体 ４ シース層 ５ 導電層 1 Inner conductor 2 Insulation layer 3 Outer conductor 4 Sheath layer 5 Conductive layer
Claims (4)
ス層をこの順に形成してなる同軸ケーブルにおいて、該
シース層を含フッ素エラストマー組成物で形成したこと
を特徴とする低雑音同軸ケーブル。1. A low noise coaxial cable in which a sheath layer is formed of a fluorine-containing elastomer composition in a coaxial cable in which an insulating layer, an outer conductor and a sheath layer are formed in this order on an inner conductor.
た請求項１記載の低雑音同軸ケーブル。2. The low noise coaxial cable according to claim 1, wherein a conductive layer is formed between the insulating layer and the outer conductor.
ース層が、熱収縮チューブである請求項１又は２記載の
低雑音同軸ケーブル。3. The low noise coaxial cable according to claim 1, wherein the sheath layer made of the fluorine-containing elastomer composition is a heat-shrinkable tube.
ース層が、導電性を有している請求項１、２又は３記載
の低雑音同軸ケーブル。4. The low noise coaxial cable according to claim 1, 2 or 3, wherein the sheath layer made of the fluorine-containing elastomer composition has conductivity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5085250A JPH06275142A (en) | 1993-03-19 | 1993-03-19 | Low noise coaxial cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5085250A JPH06275142A (en) | 1993-03-19 | 1993-03-19 | Low noise coaxial cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06275142A true JPH06275142A (en) | 1994-09-30 |
Family
ID=13853330
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5085250A Pending JPH06275142A (en) | 1993-03-19 | 1993-03-19 | Low noise coaxial cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06275142A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005098874A1 (en) * | 2004-04-06 | 2005-10-20 | Junkosha Inc. | Coaxial cable |
| KR100617289B1 (en) * | 2000-06-28 | 2006-08-30 | 엘지.필립스 엘시디 주식회사 | Structure of Preventing a Line Open of Lamp Wire |
-
1993
- 1993-03-19 JP JP5085250A patent/JPH06275142A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100617289B1 (en) * | 2000-06-28 | 2006-08-30 | 엘지.필립스 엘시디 주식회사 | Structure of Preventing a Line Open of Lamp Wire |
| WO2005098874A1 (en) * | 2004-04-06 | 2005-10-20 | Junkosha Inc. | Coaxial cable |
| JP2005302309A (en) * | 2004-04-06 | 2005-10-27 | Junkosha Co Ltd | Coaxial cable |
| JP4729751B2 (en) * | 2004-04-06 | 2011-07-20 | 株式会社潤工社 | coaxial cable |
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