JP5010300B2 - Coaxial cable and method of manufacturing inner conductor for coaxial cable - Google Patents

Coaxial cable and method of manufacturing inner conductor for coaxial cable Download PDF

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JP5010300B2
JP5010300B2 JP2007023659A JP2007023659A JP5010300B2 JP 5010300 B2 JP5010300 B2 JP 5010300B2 JP 2007023659 A JP2007023659 A JP 2007023659A JP 2007023659 A JP2007023659 A JP 2007023659A JP 5010300 B2 JP5010300 B2 JP 5010300B2
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coaxial cable
inner conductor
conductor
plating layer
die
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JP2008192385A (en
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和仁 稲垣
政志 藤本
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Fuji Electric Wire Industries Co Ltd
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    • 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
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Description

この発明は、たとえばテレビ受像機や無線機とアンテナの接続や、計測機器の接続等に用いられ、特に、地上波、衛星放送（ＢＳ／ＣＳ）、ＣＡＴＶにおける音声信号や映像信号の信号伝達に用いられるのに適した同軸ケーブルに関し、より詳しくは、良好な減衰特性を有する同軸ケーブルに関する。   The present invention is used, for example, for connecting a television receiver or radio to an antenna, or for connecting a measuring device, and in particular for signal transmission of audio signals and video signals in terrestrial, satellite broadcasting (BS / CS), CATV. More particularly, the present invention relates to a coaxial cable having good attenuation characteristics.

同軸ケーブルは、円形をした内部導体を絶縁体で被覆し、絶縁体の周囲に外部導体を配置して、その上をシースで覆った構造である。内部導体は信号（電波）を伝え、外部導体は、内部導体を伝わる信号を外部に漏らさず、また外部からの電波の侵入を防ぐ。   A coaxial cable has a structure in which a circular inner conductor is covered with an insulator, an outer conductor is arranged around the insulator, and the outer conductor is covered with a sheath. The inner conductor transmits a signal (radio wave), and the outer conductor does not leak the signal transmitted through the inner conductor to the outside, and prevents intrusion of radio waves from the outside.

このように、信号を妨害波や漏洩に配慮して安全に伝送できるように工夫がなされているわけであるが、同軸ケーブルでは高周波信号の減衰の問題がある。つまり、表皮効果によって、伝送される信号が高周波になるほど減衰量が多くなるという問題がある。表皮効果は、高周波電流が導体を流れる時、電流が導体の表面に集中して密度が高くなって抵抗が増すというものである。近年は、衛星放送などで伝送周波数が高くなっているので、減衰特性の良好な同軸ケーブルが必要である。   Thus, the signal is devised so that it can be transmitted safely in consideration of the interference wave and leakage, but the coaxial cable has a problem of attenuation of the high frequency signal. That is, there is a problem that due to the skin effect, the amount of attenuation increases as the transmitted signal becomes higher in frequency. The skin effect is that when a high-frequency current flows through a conductor, the current concentrates on the surface of the conductor and the density increases and resistance increases. In recent years, since the transmission frequency has been increased in satellite broadcasting or the like, a coaxial cable with good attenuation characteristics is required.

ところで、内部導体は、銅製の線材に対して酸化防止の目的で錫メッキを施して製造されるが、高周波信号が内部導体の表面において減衰するのは、内部導体の表面部分の性状にも原因があると考えられる。   By the way, the inner conductor is manufactured by applying tin plating to a copper wire for the purpose of preventing oxidation. However, the high frequency signal is attenuated on the surface of the inner conductor due to the property of the surface portion of the inner conductor. It is thought that there is.

すなわち、一般的な同軸ケーブルでは、内部導体の錫メッキは溶融メッキ法により行い、また、溶融錫に浸漬した後の絞り（目付制御）を石綿からなる線状体を用いて行っていた。これは、内部導体に対して被覆する絶縁体との密着性を高めるためである。   That is, in a general coaxial cable, tin plating of an inner conductor is performed by a hot dipping method, and drawing (weighing control) after being immersed in molten tin is performed using a linear body made of asbestos. This is to improve the adhesion with the insulator covering the inner conductor.

このようにして内部導体が製造されるので、図６に示したように、内部導体１０１の表面にはミクロな凹凸１０２が多く存在し、平滑性がない。このため、表皮効果によって表面に集中して流れる高周波信号の伝送に際してさらに抵抗が増し、減衰量が増大するものと考えられる。   Since the inner conductor is manufactured in this way, as shown in FIG. 6, there are many micro irregularities 102 on the surface of the inner conductor 101 and there is no smoothness. For this reason, it is considered that the resistance is further increased and the amount of attenuation is increased at the time of transmission of the high-frequency signal flowing concentrated on the surface due to the skin effect.

なお、表皮効果による減衰問題を解消しようとするものとして、たとえば下記特許文献１に開示されたような発明がある。これは、透磁率と伝導率が特殊な導電性被覆を有したものであって、上記のような観点から良好な減衰特性を得ようとするものではない。また、内部導体の表面の性状によって、高周波信号の減衰問題を解消しようとするものはない。   In addition, there exists invention which was disclosed by the following patent document 1 as what is going to eliminate the attenuation | damping problem by a skin effect. This is because the magnetic permeability and conductivity have a special conductive coating, and it is not intended to obtain good damping characteristics from the above viewpoint. In addition, there is no attempt to solve the high-frequency signal attenuation problem depending on the surface properties of the inner conductor.

特開２００６−４９３２８号公報JP 2006-49328 A

この発明は、内部導体の表面状態によって良好な減衰特性を得ることを主たる課題とする。   The main object of the present invention is to obtain good attenuation characteristics depending on the surface state of the inner conductor.

そのための手段は、内部導体を絶縁体、外部導体およびシースで順に覆った同軸ケーブルであって、上記内部導体が、銅製の線材の表面に、平均厚０．５〜０．６μmの錫メッキ層を有したものであり、該錫メッキ層の表面における凹凸のばらつきが、ダイスにより０．１μｍ以内となるように形成された同軸ケーブルである。
Means therefor is a coaxial cable in which an inner conductor is covered with an insulator, an outer conductor and a sheath in order, and the inner conductor is a tin-plated layer having an average thickness of 0.5 to 0.6 μm on the surface of a copper wire. The coaxial cable is formed such that unevenness on the surface of the tin plating layer is within 0.1 μm by a die.

別の手段は、絶縁体、外部導体およびシースで順に覆われた同軸ケーブル用内部導体の製造方法であって、銅製の線材を溶融錫に浸漬した後、ダイスのダイス穴を通過させて、ダイスによる目付制御と表面の平滑化を行って、平均の厚さが０．５〜０．６μmで、表面における凹凸のばらつきが０．１μｍ以内である錫メッキ層を形成する同軸ケーブル用内部導体の製造方法である。
Another means is a method of manufacturing an inner conductor for a coaxial cable, which is sequentially covered with an insulator, an outer conductor, and a sheath. After the copper wire is immersed in molten tin, the die is passed through a die hole. Of the inner conductor for a coaxial cable that forms a tin-plated layer having an average thickness of 0.5 to 0.6 μm and a surface irregularity variation of 0.1 μm or less . It is a manufacturing method.

すなわち、上記の構成によれば、線材の表面に形成された錫メッキは、厚さが０．５〜０．６μmと、１μmを超える一般的なものよりも薄い。これによって、導電率が高い銅製の線材で伝達される高周波信号を多くすることができる。しかも、その表面は滑らかである。滑らかとは、厚さのばらつきが０．１μm以内と、１μmを超える一般的なものよりも少ない状態である。 That is, according to said structure, the tin plating formed in the surface of a wire is 0.5-0.6 micrometer, and is thinner than the general thing exceeding 1 micrometer. As a result, it is possible to increase the number of high-frequency signals transmitted through the copper wire having high conductivity. Moreover, the surface is smooth. “Smooth” refers to a state in which the thickness variation is within 0.1 μm and less than a general one exceeding 1 μm.

このため、内部導体の表面部分における抵抗の増加を防ぎ、高周波信号の減衰を抑えることができる。   For this reason, an increase in resistance at the surface portion of the inner conductor can be prevented, and attenuation of the high-frequency signal can be suppressed.

以上のように、この発明によれば、表皮効果による高周波信号の減衰を抑えることができる。   As described above, according to the present invention, attenuation of a high-frequency signal due to the skin effect can be suppressed.

この発明を実施するための一形態を、以下図面を用いて説明する。
図１は、同軸ケーブル１１の構造を示す斜視図であり、同軸ケーブル１１は、断面における中心に位置する内部導体２１と、内部導体２１を順に取り巻く、絶縁体３１、外部導体４１、およびシース５１を有する。 An embodiment for carrying out the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view showing the structure of the coaxial cable 11. The coaxial cable 11 has an inner conductor 21 located at the center of the cross section, an insulator 31, an outer conductor 41, and a sheath 51 surrounding the inner conductor 21 in order. Have

内部導体２１は、信号（電波）が伝わる部分で、図２に示したように、軟銅からなる断面真円形の線材２２の表面に、厚さｔの平均が０．５〜０．６μmである錫メッキ層２３が形成された構造である。錫メッキ層２３の形成は酸化防止のためである。   The inner conductor 21 is a portion through which a signal (radio wave) is transmitted. As shown in FIG. 2, the average thickness t is 0.5 to 0.6 μm on the surface of the wire 22 having a perfectly circular cross section made of soft copper. In this structure, a tin plating layer 23 is formed. The formation of the tin plating layer 23 is to prevent oxidation.

絶縁体４１は、電気的絶縁機能と内部導体保護機能をもち、たとえば発泡ポリエチレンで形成されている。   The insulator 41 has an electrical insulation function and an internal conductor protection function, and is formed of, for example, foamed polyethylene.

外部導体は、内部導体を伝わる信号（電波）を外部に漏らさず、また外部からの電波の侵入を防ぐためのもので、アルミ箔テープ４２と編組線４３とで構成されている。アルミ箔テープ４２には、たとえば両面アルミ箔付けＰＥＴテープが使用できる。編組線４３には、アルミニウム合金線を網状に撚ったものが使用できる。   The outer conductor does not leak a signal (radio wave) transmitted through the inner conductor to the outside, and prevents intrusion of radio waves from the outside, and is composed of an aluminum foil tape 42 and a braided wire 43. As the aluminum foil tape 42, for example, a double-sided aluminum foil-attached PET tape can be used. As the braided wire 43, an aluminum alloy wire twisted in a net shape can be used.

シース５１は、同軸ケーブル１１を包んで保護する外皮であり、たとえば耐候性塩化ビニルで形成される。   The sheath 51 is an outer skin that wraps and protects the coaxial cable 11 and is formed of, for example, weather-resistant vinyl chloride.

そして、上記内部導体２１の錫メッキ層２３は、溶融メッキ法により形成され、図３に示したように厚さのばらつきが少ない平滑に形成されている。表面が滑らかなので、外観上光沢を有する。   The tin plating layer 23 of the inner conductor 21 is formed by a hot dipping method, and is formed smoothly with little variation in thickness as shown in FIG. Since the surface is smooth, it has a glossy appearance.

このような錫メッキ層２３は、図４に示したようにして形成される。
すなわち、長尺の線材２２を所定温度に加熱した溶融錫６１に順次浸漬したのち、溶融錫６１から出た、溶融錫６１の付着している線材２２に対して絞りを行う。この絞りは、ダイス６２を通して行う。ダイス６２には、線材２２の径に応じて所定大のダイス穴６３が形成されている。また、ダイス穴６３の口縁は凹凸がないよう滑らかに形成されている。これにより、所定厚の錫メッキ層２３が形成できる。しかも、ダイス穴６３の口縁が凹凸のない滑らかな形状に形成されているので、錫メッキ層２３の表面における凹凸のばらつきを抑えることができる。具体的には０．１μm以内に抑えられ、平滑性と緻密性を有持たせることができる。 Such a tin plating layer 23 is formed as shown in FIG.
That is, after the long wire 22 is sequentially immersed in the molten tin 61 heated to a predetermined temperature, the wire 22 coming out of the molten tin 61 and having the molten tin 61 attached thereto is squeezed. This throttling is performed through the die 62. A predetermined large die hole 63 is formed in the die 62 according to the diameter of the wire 22. Further, the rim of the die hole 63 is formed smoothly so as not to be uneven. Thereby, the tin plating layer 23 having a predetermined thickness can be formed. In addition, since the rim of the die hole 63 is formed in a smooth shape without irregularities, it is possible to suppress variations in irregularities on the surface of the tin plating layer 23. Specifically, it can be suppressed within 0.1 μm, and can have smoothness and denseness.

このようにして形成した内部導体２１を有する同軸ケーブル１１について、減衰特性について試験を行ったところ、図５に示したような結果が得られた。   When the coaxial cable 11 having the inner conductor 21 formed as described above was tested for attenuation characteristics, the result shown in FIG. 5 was obtained.

試験に用いた試料としての同軸ケーブル１１は、内部導体２１の外径が１．０５ｍｍで、絶縁体３１の外径が５．０ｍｍ、絶縁体３１の厚さが１．９８ｍｍであり、外部導体４１に、厚さ０．０５ｍｍの両面アルミ箔付けＰＥＴテープ（アルミ箔テープ４２）とアルミニウム合金線からなる編組線４３を用い、シース５１には、厚さ０．９５ｍｍの耐候性塩化ビニルからなるものである。   The coaxial cable 11 as a sample used for the test has an outer diameter of the inner conductor 21 of 1.05 mm, an outer diameter of the insulator 31 of 5.0 mm, and a thickness of the insulator 31 of 1.98 mm. A braided wire 43 made of PET tape (aluminum foil tape 42) with a double-sided aluminum foil having a thickness of 0.05 mm and an aluminum alloy wire is used for 41, and a weather-resistant vinyl chloride having a thickness of 0.95 mm is used for the sheath 51. Is.

比較例として、内部導体の錫メッキ層が、従来のとおり石綿からなる線状体で目付制御がなされて形成され、その他の部位の条件は上記の条件と同一の同軸ケーブルでも試験を行った。   As a comparative example, the tin plating layer of the inner conductor was formed by controlling the basis weight with a linear body made of asbestos as in the past, and the coaxial cable having the same conditions as the above conditions was also tested for other parts.

試験では１００ｍ当たりの減衰量を調べた。図５において、試料の結果は実線で、比較例の結果は一点鎖線で示した。   In the test, the attenuation per 100 m was examined. In FIG. 5, the result of the sample is indicated by a solid line, and the result of the comparative example is indicated by a one-dot chain line.

この図に示すように、全体として周波数が高くなるに連れて減衰量が高まるが、試料の場合には、比較例の場合に比して減衰量が大きくない。   As shown in this figure, the attenuation amount increases as the frequency increases as a whole, but in the case of the sample, the attenuation amount is not large compared to the case of the comparative example.

すなわち、試料の場合、２２０ＭＨｚで９．６ｄＢ、４７０ＭＨｚで１４．５ｄＢ、７７０ＭＨｚで１９ｄＢ、１０００ＭＨｚで２３ｄＢ、１３００ＭＨｚで２７ｄＢ、１５５０ＭＨｚで３０．２ｄＢ、１７７０ＭＨｚで３２．８ｄＢ、１８００ＭＨｚで３４ｄＢ、２０００ＭＨｚで３７ｄＢと減衰するのに対して、比較例の場合には、上記各周波数においてそれぞれ順に、１１．５ｄＢ、２０．５ｄＢ、２７．５ｄＢ、３４ｄＢ、４１．８ｄＢ、４８ｄＢ、５２ｄＢ、５６ｄＢとなった。   That is, in the case of a sample, 9.6 dB at 220 MHz, 14.5 dB at 470 MHz, 19 dB at 770 MHz, 23 dB at 1000 MHz, 27 dB at 1300 MHz, 30.2 dB at 1550 MHz, 32.8 dB at 1770 MHz, 34 dB at 1800 MHz, 37 dB at 2000 MHz. In contrast, in the case of the comparative example, the frequencies were 11.5 dB, 20.5 dB, 27.5 dB, 34 dB, 41.8 dB, 48 dB, 52 dB, and 56 dB, respectively, in the comparative example.

このように、比較例と比べると、全体的に減衰を抑えることができるうえ、特に高周波数域においての減衰量を抑えることができる。   As described above, as compared with the comparative example, it is possible to suppress the attenuation as a whole, and it is possible to suppress the amount of attenuation particularly in a high frequency region.

しかも、減衰特性を良好にするために内部導体の表面のメッキ層を銀メッキで行うことも考えられるが、銀メッキは効果であって、製造コストを抑えたい同軸ケーブルには使用できない。この点、上述のように錫メッキであれば、安価に製造でき、そのうえ上述の如く良好な減衰特性を得ることができる。   In addition, it is conceivable that the plating layer on the surface of the inner conductor is formed by silver plating in order to improve the attenuation characteristics, but silver plating is effective and cannot be used for a coaxial cable for which the manufacturing cost is to be suppressed. In this regard, if tin plating is used as described above, it can be manufactured at a low cost, and good damping characteristics can be obtained as described above.

また、銀メッキ層を形成する場合には電気メッキ法によらなければならないが、錫メッキ層を形成する場合であれば溶融メッキ法で製造できるので、既存の設備を有効に利用できる利点も有する。   In addition, when a silver plating layer is formed, it must be based on an electroplating method. However, if a tin plating layer is formed, it can be manufactured by a hot dipping method, so that there is an advantage that existing facilities can be used effectively. .

以上はこの発明を実施するための一形態であり、上述の構成に限定されるものではなく、その他の形態を採用することができる。   The above is one form for implementing this invention, and is not limited to the above-mentioned structure, Other forms can be employ | adopted.

同軸ケーブルの構造を示す斜視図。The perspective view which shows the structure of a coaxial cable. 内部導体の断面構造を示す拡大図。The enlarged view which shows the cross-section of an internal conductor. 内部導体の一部破断側面図。The partially broken side view of an internal conductor. 内部導体の製造方法を示す説明図。Explanatory drawing which shows the manufacturing method of an internal conductor. 減衰特性を示すグラフ。The graph which shows a damping characteristic. 従来の内部導体の一部破断側面図。The partially broken side view of the conventional internal conductor.

符号の説明Explanation of symbols

１１…同軸ケーブル
２１…内部導体
２２…線材
２３…錫メッキ層
３１…絶縁体
４１…外部導体
５１…シース
６１…溶融錫
６２…ダイス
６３…ダイス穴 DESCRIPTION OF SYMBOLS 11 ... Coaxial cable 21 ... Inner conductor 22 ... Wire material 23 ... Tin plating layer 31 ... Insulator 41 ... Outer conductor 51 ... Sheath 61 ... Molten tin 62 ... Die 63 ... Die hole

Claims (2)

内部導体を絶縁体、外部導体およびシースで順に覆った同軸ケーブルであって、
上記内部導体が、銅製の線材の表面に、平均厚０．５〜０．６μmの錫メッキ層を有したものであり、該錫メッキ層の表面における凹凸のばらつきが、ダイスにより０．１μｍ以内となるように形成された
同軸ケーブル。 A coaxial cable in which an inner conductor is covered with an insulator, an outer conductor, and a sheath in order,
The inner conductor has a tin plating layer with an average thickness of 0.5 to 0.6 μm on the surface of a copper wire, and the unevenness on the surface of the tin plating layer is within 0.1 μm due to a die. become thus formed coaxial cable. 絶縁体、外部導体およびシースで順に覆われた同軸ケーブル用内部導体の製造方法であって、
銅製の線材を溶融錫に浸漬した後、ダイスのダイス穴を通過させて、ダイスによる目付制御と表面の平滑化を行って、平均の厚さが０．５〜０．６μmで、表面における凹凸のばらつきが０．１μｍ以内である錫メッキ層を形成する
同軸ケーブル用内部導体の製造方法。
A method of manufacturing an inner conductor for a coaxial cable covered with an insulator, an outer conductor, and a sheath in order,
After immersing the copper wire in the molten tin, and passed through a die hole of the die, by performing the smoothing of the basis weight control and surface by the die, the thickness of the average in 0.5～0.6Myuemu, irregularities in the surface The manufacturing method of the inner conductor for coaxial cables which forms the tin plating layer whose dispersion | variation is less than 0.1 micrometer .
JP2007023659A 2007-02-02 2007-02-02 Coaxial cable and method of manufacturing inner conductor for coaxial cable Expired - Fee Related JP5010300B2 (en)

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