JP6893419B2 - coaxial cable - Google Patents

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JP6893419B2
JP6893419B2 JP2017003432A JP2017003432A JP6893419B2 JP 6893419 B2 JP6893419 B2 JP 6893419B2 JP 2017003432 A JP2017003432 A JP 2017003432A JP 2017003432 A JP2017003432 A JP 2017003432A JP 6893419 B2 JP6893419 B2 JP 6893419B2
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coaxial cable
substantially flat
shield layer
lumber
constituting
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JP2018113180A (en
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克昭 加藤
克昭 加藤
篤史 川合
篤史 川合
恭輔 大石
恭輔 大石
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Nissei Electric Co Ltd
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本発明は、情報通信機器、通信端末機器、さらには計測機器等の高周波部品の信号伝達線路、および内視鏡、超音波診断装置等の医療用器具の機器配線路として用いられる同軸ケーブルに関する。 The present invention relates to a coaxial cable used as a signal transmission line for high-frequency components such as information communication equipment, communication terminal equipment, and measuring equipment, and a device wiring path for medical equipment such as an endoscope and an ultrasonic diagnostic device.

近年、情報通信機器や通信端末機器等はますます小型化され、機器内の配線スペースはより狭くなり、同軸ケーブルは更なる細径化が求められている。
一方、細径であっても、高速、大容量化する情報通信機器において、減衰量等の高周波特性を維持することが切望されている。
In recent years, information communication equipment and communication terminal equipment have become smaller and smaller, the wiring space in the equipment has become narrower, and the coaxial cable is required to have a smaller diameter.
On the other hand, it is desired to maintain high frequency characteristics such as attenuation in information communication equipment having a small diameter but increasing in speed and capacity.

同軸ケーブルの細線化としては、絶縁体の外周に金属素線を巻き回してなる横巻シールド構造の他、略矩形のリボン状導体を螺旋状に巻装する構造が知られている。(特許文献1、特許文献2)
しかし、横巻シールド構造では細線化が未だ不十分であり、また、リボン状導体では柔軟性が劣る傾向があり、更なる改良が求められている。
As a thinning of the coaxial cable, in addition to a horizontal winding shield structure in which a metal wire is wound around the outer circumference of an insulator, a structure in which a substantially rectangular ribbon-shaped conductor is spirally wound is known. (Patent Document 1, Patent Document 2)
However, the horizontal winding shield structure is still insufficiently thinned, and the ribbon-shaped conductor tends to be inferior in flexibility, and further improvement is required.

特開2009−146850号公報JP-A-2009-146850 特開2000−353435号公報Japanese Unexamined Patent Publication No. 2000-353435

本発明の課題は、同軸ケーブルの細径化を図るとともに、細径であっても減衰量、反射損失(VSWR)、シールド特性、クロストーク等の高周波特性に優れ、かつ、柔軟性においても優れる同軸ケーブルを提供することにある。 The subject of the present invention is to reduce the diameter of the coaxial cable, and even if the diameter is small, it is excellent in high frequency characteristics such as attenuation, reflection loss (VSWR), shield characteristics, and crosstalk, and is also excellent in flexibility. To provide coaxial cables.

本発明の要旨は以下のとおりである。 The gist of the present invention is as follows.

(1)シールド層を有する同軸ケーブルにおいて、シールド層の少なくとも一層は、複数本からなる略平角形状の導体(略平角材)を互いに重ならないように並列に配置された状態で巻きつけられる構造を有する。
(2)シールド層を有する同軸ケーブルにおいて、該シールド層の少なくとも一層は、複数本からなる略平角形状の導体(略平角材)を互いに重ならないように並列に配置された状態で巻きつけられる構造であって、同軸ケーブルの線方向に対する、略平角材の巻きつけ角度α(<90°)は、10°〜40°である。
)シールド層を有する同軸ケーブルにおいて、該シールド層は、導電性を有するテープ材を縦添えし、該テープ材の上に、略平角材を巻きつける構造を有する。
(4)同軸ケーブルを構成する誘電体外径D、及び、シールド層を構成する略平角材の幅Wは、以下の関係式を満たす。
(関係式)0.7≦D/W≦10
(5)同軸ケーブルを構成する誘電体外径D、及び、シールド層を構成する略平角材の厚みTは、以下の関係式を満たす。
(関係式)8≦D/T≦80
(6)シールド層を構成する略平角材の遮蔽密度は80%以上である。
)巻きつけられた略平角材間の隙間距離は、100μm以下である。
)シールド層を構成するテープ材は、幅方向の両端が重なり合わない状態で縦添えされる。
)縦添されたテープ材において、テープが施されていない隙間距離は、200μm以下である。
(1) In a coaxial cable having a shield layer, at least one layer of the shield layer has a structure in which a plurality of substantially flat conductors (substantially flat square members) are wound in parallel so as not to overlap each other. Have.
(2) In a coaxial cable having a shield layer, at least one layer of the shield layer is wound in a state in which a plurality of substantially flat conductors (substantially flat lumber) are arranged in parallel so as not to overlap each other. The winding angle α (<90 °) of the substantially flat square timber with respect to the line direction of the coaxial cable is 10 ° to 40 °.
( 3 ) In a coaxial cable having a shield layer, the shield layer has a structure in which a conductive tape material is vertically attached and a substantially flat square material is wound around the tape material.
(4) The dielectric outer diameter D constituting the coaxial cable and the width W of the substantially flat square lumber constituting the shield layer satisfy the following relational expressions.
(Relational expression) 0.7 ≤ D / W ≤ 10
(5) The dielectric outer diameter D constituting the coaxial cable and the thickness T of the substantially flat square lumber constituting the shield layer satisfy the following relational expressions.
(Relational expression) 8 ≤ D / T ≤ 80
(6) The shielding density of the substantially flat lumber constituting the shield layer is 80% or more.
( 7 ) The gap distance between the wound substantially flat lumber is 100 μm or less.
( 8 ) The tape material constituting the shield layer is vertically attached in a state where both ends in the width direction do not overlap.
( 9 ) In the vertically attached tape material, the gap distance to which the tape is not applied is 200 μm or less.

本発明によれば、以下に記載する優れた効果が期待できる。 According to the present invention, the excellent effects described below can be expected.

(1)内部導体は細くせず、外部導体を薄くすることで細径化しているため、減衰量等の高周波特性を維持したまま、細径化が可能となる。
(2)略平角材を用いるため、丸型の素線に比べ外部導体を薄くできる(すなわち細径化できる)とともに、複数本を並列配置し、一括して巻き付けられるため、太径の略平角材を1本巻き付ける場合と比べ、格段に柔軟性が改善される。
(3)シールド層として、導電性を有するテープ材を縦添えした上に、金属製の略平角材を巻きつける2重構造であれば、細径化の他、減衰量やシールド特性等の高周波特性においても優れる。
(4)さらに、本発明の略平角材の仕様(幅、厚み)及び誘電体外径の関係式、巻き付け角度、略平角材間の隙間距離とすることで、柔軟性を犠牲とすることなく細径化でき、より小型化された機器内への自由な配線が可能となる。
(5)略平角材は、丸線より幅広であることから、丸線を使用する場合と比べ、巻き付ける本数が減らすことができる。その結果、巻き付け張力を高く設定でき、断線・乗りこえ(コブ)等の発生を抑えられる。
(6)また、従前のように丸線を多数束ねて巻き付ける場合と比べ、本願の略平角材のように、幅広の線を少ない本数を巻き付ける方が、線間の隙間が少なくなるため、シールド特性の向上においても寄与する。
(7)本発明のテープ材は、幅方向の両端が重なり合わない状態で縦添えされるため、略平角材を巻き付ける際に、テープ材の反転やしわ、折れ等を防止し、安定生産が可能となる。
(1) Since the inner conductor is not thinned but the outer conductor is thinned to reduce the diameter, it is possible to reduce the diameter while maintaining high frequency characteristics such as the amount of attenuation.
(2) Since a substantially flat square lumber is used, the outer conductor can be made thinner (that is, the diameter can be reduced) compared to a round wire, and a plurality of conductors can be arranged in parallel and wound together, so that the diameter is approximately flat. Compared to the case of wrapping one square timber, the flexibility is significantly improved.
(3) If the double structure is such that a conductive tape material is vertically attached as a shield layer and a substantially flat metal material is wound around the shield layer, the diameter is reduced and high frequencies such as attenuation and shield characteristics are obtained. It is also excellent in characteristics.
(4) Further, by setting the specifications (width, thickness) of the substantially flat square timber of the present invention, the relational expression of the outer diameter of the dielectric, the winding angle, and the gap distance between the substantially flat square timbers, the flexibility is not sacrificed. The diameter can be reduced, and free wiring can be performed inside a smaller device.
(5) Since the substantially flat square lumber is wider than the round wire, the number of wraps can be reduced as compared with the case where the round wire is used. As a result, the winding tension can be set high, and the occurrence of disconnection, overrunning (hump), etc. can be suppressed.
(6) In addition, compared to the case where a large number of round wires are bundled and wound as in the past, when a small number of wide wires are wound as in the substantially flat square lumber of the present application, the gap between the wires is reduced, so that the shield is used. It also contributes to the improvement of characteristics.
(7) Since the tape material of the present invention is vertically attached in a state where both ends in the width direction do not overlap, stable production is achieved by preventing the tape material from being inverted, wrinkled, broken, etc. when winding a substantially flat square material. It will be possible.

本発明に係る同軸ケーブルの一例を示す断面図Sectional drawing which shows an example of the coaxial cable which concerns on this invention 本発明のシールド層を構成する略平角材の概略図Schematic diagram of a substantially flat lumber constituting the shield layer of the present invention 本発明の略平角材の巻き付けを示す概略図Schematic diagram showing winding of a substantially flat lumber of the present invention 柔軟性の評価方法を示す概略図Schematic diagram showing how to evaluate flexibility 本発明に係る同軸ケーブル等の電気特性評価結果(減衰量)Evaluation result (attenuation amount) of electrical characteristics of a coaxial cable or the like according to the present invention. 本発明に係る同軸ケーブル等の電気特性評価結果(反射損失(VSWR))Evaluation Results of Electrical Characteristics of Coaxial Cable, etc. According to the Present Invention (Reflection Loss (VSWR)) 本発明に係る同軸ケーブル等の電気特性評価結果(クロストーク)Evaluation Results of Electrical Characteristics of Coaxial Cable, etc. According to the Invention (Crosstalk)

以下、本発明の同軸ケーブルの一例として、基本構成について、図面を参照しながら説明する。 Hereinafter, as an example of the coaxial cable of the present invention, the basic configuration will be described with reference to the drawings.

図1の同軸ケーブル1は、中心より順に、内部導体2、誘電体層3、シールド層6を構成するテープ材4及び略平角材5、そして、外層7である。 The coaxial cable 1 of FIG. 1 is, in order from the center, an inner conductor 2, a dielectric layer 3, a tape material 4 forming a shield layer 6, a substantially flat square material 5, and an outer layer 7.

シールド層の少なくとも一層は、複数本からなる略平角形状の導体(略平角材)を互いに重ならないように並列に配置された状態で巻きつけられる構造を有する。高周波特性の観点で、シールド層6は、導電性を有するテープ材4を縦添えする層と、複数本の略平角形状の導体(略平角材)5を巻き付ける層の2層設けることが好ましい。
At least one layer of the shield layer has a structure in which a plurality of substantially flat conductors (substantially flat square members) are wound in a state of being arranged in parallel so as not to overlap each other. From the viewpoint of high frequency characteristics, it is preferable that the shield layer 6 is provided with two layers, a layer in which the conductive tape material 4 is vertically attached and a layer in which a plurality of substantially flat conductors (substantially flat square members) 5 are wound.

テープ材4の材質は導電性を有し、シールド特性が得られれば、特に限定されない。
例えば、両面又は片面に銅やアルミニウム等の金属箔を設けた、ポリエステル等の樹脂との複合テープ、あるいは、銅やアルミニウム等の金属箔テープ、導電フィラー入りテープ等が挙げられる。
The material of the tape material 4 is not particularly limited as long as it has conductivity and shield characteristics can be obtained.
For example, a composite tape with a resin such as polyester provided with a metal foil such as copper or aluminum on both sides or one side, a metal foil tape such as copper or aluminum, a tape containing a conductive filler, or the like can be mentioned.

テープ材4の寸法は特に限定しないが、テープ材4は、幅方向の両端が重なり合わない状態で縦添えされることが好ましい。幅方向の両端が重なり合わない状態は、テープ材4の幅が、誘電体の周径よりも小さいことを示している。(図3)
さらに、テープ材4が施されていない(周方向の)隙間距離は、テープ材の反転やしわ、折れ等を防止の観点で200μm以下であることが好ましく、より好ましくは150μm以下である。
シールド特性や、端末加工時のレーザー光による誘電体損傷を防止する観点で、最も好ましくは100μm以下である。
The dimensions of the tape material 4 are not particularly limited, but it is preferable that the tape material 4 is vertically attached in a state where both ends in the width direction do not overlap. The state in which both ends in the width direction do not overlap indicates that the width of the tape material 4 is smaller than the peripheral diameter of the dielectric. (Fig. 3)
Further, the gap distance (in the circumferential direction) where the tape material 4 is not applied is preferably 200 μm or less, more preferably 150 μm or less, from the viewpoint of preventing inversion, wrinkles, breakage, etc. of the tape material.
It is most preferably 100 μm or less from the viewpoint of shielding characteristics and preventing dielectric damage due to laser light during terminal processing.

略平角材5の材質は、金属製が好ましいが、シールド特性が保たれれば、樹脂等を含有してもよく、特に限定しない。好ましくは、銀メッキや錫めっき等を施した軟銅線や硬銅線等である。 The material of the substantially flat lumber 5 is preferably made of metal, but may contain a resin or the like as long as the shielding characteristics are maintained, and is not particularly limited. An annealed copper wire or a hard copper wire plated with silver, tin, or the like is preferable.

略平角材5の形状は、例えば、丸型の金属導体を圧延したものであり、楕円や平角等の形状であって、丸線より厚みが小さい形状であれば、特に限定されない。 The shape of the substantially flat square lumber 5 is not particularly limited as long as it is, for example, a rolled metal conductor of a round shape, has a shape such as an ellipse or a flat square, and has a thickness smaller than that of a round wire.

略平角材5の持ち数は、2本以上であれば特に限定されないが、柔軟性及び生産性の観点で4本〜16本が好ましい。
4本より多くすることで、略平角材5の幅を小さくでき、柔軟性に寄与するとともに、16本より小さくすることで、巻き付ける際に素線への巻き付け強度を強く設定でき、より凹凸の少ない滑らかな表面が得られるため、凹凸不良を抑制し生産性に寄与する。
The number of substantially flat square timbers 5 is not particularly limited as long as it is 2 or more, but 4 to 16 pieces are preferable from the viewpoint of flexibility and productivity.
By making the number more than 4, the width of the substantially flat square timber 5 can be reduced, which contributes to flexibility, and by making it smaller than 16, the strength of wrapping around the wire can be set strongly, and the unevenness becomes more uneven. Since a small amount of smooth surface can be obtained, unevenness defects are suppressed and contribution to productivity is contributed.

略平角材5は、適切な持ち数で束ねられた複数本からなり、略平角材のそれぞれが互いに重ならないよう並列に配置された状態で巻きつけられる。細径の略平角材5を複数本同時に巻き付けることで、柔軟性に寄与する。製造方法は限定されないが、複数本の略平角材は、一括して同時に巻き付けられることが好ましい。
The substantially flat square timber 5 is composed of a plurality of pieces bundled in an appropriate number of holdings, and the substantially flat square timbers are wound in a state of being arranged in parallel so as not to overlap each other. By winding a plurality of substantially flat square timbers 5 having a small diameter at the same time, it contributes to flexibility. Although the manufacturing method is not limited, it is preferable that a plurality of substantially flat lumbers are wound together at the same time.

略平角材5の仕様、及び、巻き付け角度については、同軸ケーブル1の柔軟性を維持する目的で、下記の設定が好ましい。 The specifications of the substantially flat lumber 5 and the winding angle are preferably set as follows for the purpose of maintaining the flexibility of the coaxial cable 1.

すなわち、略平角材5の幅Wについては、同軸ケーブルを構成する誘電体外径Dとの下記関係式を満たすことが好ましい。
0.7≦D/W≦10(関係式1)
さらに、柔軟性、及び、生産性の観点で、さらに好ましくは、
2≦D/W≦8(関係式2)
である。
That is, it is preferable that the width W of the substantially flat lumber 5 satisfies the following relational expression with the dielectric outer diameter D constituting the coaxial cable.
0.7 ≦ D / W ≦ 10 (relationship formula 1)
Further, from the viewpoint of flexibility and productivity, more preferably.
2 ≦ D / W ≦ 8 (relationship formula 2)
Is.

本関係式は、柔軟性を維持するために、誘電体外径に対して、適する略平角材の幅が設定できることを示している。特に、関係式2が示すように、誘電体外径Dは、略平角材の幅の2倍から8倍程度であると、柔軟性、及び、生産性の両方に優れる。
すなわち、2倍以上では、より柔軟性に寄与し、8倍以下では、略平角材の持ち数を少なくでき、生産性に寄与する。
This relational expression indicates that a suitable width of a substantially flat lumber can be set with respect to the outer diameter of the dielectric in order to maintain flexibility. In particular, as shown by the relational expression 2, when the dielectric outer diameter D is about 2 to 8 times the width of the substantially flat lumber, both flexibility and productivity are excellent.
That is, when it is 2 times or more, it contributes more flexibility, and when it is 8 times or less, the number of substantially flat lumber can be reduced, which contributes to productivity.

略平角材5の厚さTについては、同軸ケーブルを構成する誘電体外径Dとして、下記関係式を満たすことが好ましい。
8≦D/T≦80(関係式3)
さらに、柔軟性、及び、生産性の観点で、さらに好ましくは、
8≦D/T≦60(関係式4)
である。
Regarding the thickness T of the substantially flat lumber 5, it is preferable that the outer diameter D of the dielectric constituting the coaxial cable satisfies the following relational expression.
8 ≦ D / T ≦ 80 (relationship formula 3)
Further, from the viewpoint of flexibility and productivity, more preferably.
8 ≦ D / T ≦ 60 (relationship formula 4)
Is.

本関係式は、柔軟性を維持するために、誘電体外径に対して、適する略平角材の厚さが設定できることを示している。特に、関係式4が示すように、誘電体外径Dは、略平角材の厚さの8倍から60倍程度であると、柔軟性、及び、生産性の両方に優れる。
すなわち、8倍以上では、より柔軟性に寄与し、60倍以下では、巻き付け強度を強く設定できるため、より生産性に寄与する。
This relational expression indicates that an appropriate thickness of a substantially flat lumber can be set with respect to the outer diameter of the dielectric in order to maintain flexibility. In particular, as shown by the relational expression 4, when the dielectric outer diameter D is about 8 to 60 times the thickness of the substantially flat lumber, both flexibility and productivity are excellent.
That is, when it is 8 times or more, it contributes more flexibility, and when it is 60 times or less, the winding strength can be set strongly, which further contributes to productivity.

略平角材5の遮蔽密度は80%以上が好ましいが、シールド特性の観点で、特に好ましくは90%以上である。 The shielding density of the substantially flat lumber 5 is preferably 80% or more, but is particularly preferably 90% or more from the viewpoint of shielding characteristics.

略平角材5の巻き付け角度α(<90°)は、同軸ケーブル1の線方向に対し、5°〜60°であることが好ましい。生産性向上の観点で、さらに好ましくは5°〜50°である。生産性向上に加え、柔軟性の観点で、最も好ましくは、10°〜40°である。(図3) The winding angle α (<90 °) of the substantially flat lumber 5 is preferably 5 ° to 60 ° with respect to the line direction of the coaxial cable 1. From the viewpoint of improving productivity, it is more preferably 5 ° to 50 °. In addition to improving productivity, it is most preferably 10 ° to 40 ° from the viewpoint of flexibility. (Fig. 3)

略平角材5のそれぞれは、互いに重ならないよう並列配置されていることが好ましい。すなわち、幅方向の両端が重なり合わない状態であるため、同軸ケーブル1のいずれの部分をとっても、略平角材は一層のみ施されている状態であり、平滑性が保たれ、電気特性の向上につながる。 It is preferable that each of the substantially flat square timbers 5 is arranged in parallel so as not to overlap each other. That is, since both ends in the width direction do not overlap each other, no matter which part of the coaxial cable 1 is taken, only one layer of substantially flat lumber is applied, so that smoothness is maintained and electrical characteristics are improved. Connect.

巻きつけられた略平角材5間の隙間距離は、シールド特性の観点より、50μm以下が好ましい。隙間距離は、小さい方が、略平角材が平滑に施されることとなり、反射損失(VSWR)を低く抑えられ、減衰特性の改善に寄与することから、さらに好ましくは、30μm以下、最も好ましくは20μm以下である。 The gap distance between the wound substantially flat square timbers 5 is preferably 50 μm or less from the viewpoint of shield characteristics. The smaller the gap distance, the smoother the flat lumber is applied, the lower the reflection loss (VSWR) is suppressed, and the more it contributes to the improvement of the damping characteristics. Therefore, it is more preferably 30 μm or less, most preferably 30 μm or less. It is 20 μm or less.

(柔軟性の測定方法)
同軸ケーブル1の柔軟性は、先端に重りをつけた一定長のケーブルを、測定台より垂らし、その垂れ具合を測定する方法にて評価する。(図4参照)
(1)測定台にケーブルを固定する。その際、ケーブルが、台の支点より50mm外側に出るように固定し、ケーブル先端に重り5gを取り付ける。
(2)支点下25mmの点において、台とケーブルの水平距離Xを測定する。
(Measurement method of flexibility)
The flexibility of the coaxial cable 1 is evaluated by a method in which a cable having a constant length with a weight at the tip is hung from a measuring table and the degree of dripping is measured. (See Fig. 4)
(1) Fix the cable to the measuring table. At that time, fix the cable so that it protrudes 50 mm outside the fulcrum of the base, and attach a weight of 5 g to the tip of the cable.
(2) Measure the horizontal distance X between the base and the cable at a point 25 mm below the fulcrum.

本発明におけるその余の構成については、一般的なケーブルの仕様であって、とくに限定されるものではない。 The remaining configuration in the present invention is a general cable specification and is not particularly limited.

以下、本発明の同軸ケーブル1(図1)について、実施例を挙げ、さらに具体的に説明するが、本発明の範囲について、これらに限定されるものではない。 Hereinafter, the coaxial cable 1 (FIG. 1) of the present invention will be described in more detail with reference to examples, but the scope of the present invention is not limited thereto.

(実施例1〜4、比較例1〜2、従来例1〜2)
実施例1は、内部導体2は外径0.15mmの銀めっき軟銅線7/0.05、誘電体3は肉厚0.125mm、外径0.40mmのPFA樹脂である。
シールド層6は、幅1.20mm、厚さ0.01mmの銅ポリエステルテープを縦添えした上に、幅W0.60mm、厚さT0.05mmの銀メッキ軟銅線からなる略平角材5を2本束ね、互いに重ならないよう並列配置し、一括して同時に巻き付ける。略平角材5の巻き付け角度は12°である。
外層5は、肉厚0.05mm、外径0.56mmのPFA樹脂である。
(Examples 1 to 4, Comparative Examples 1 to 2, Conventional Examples 1 to 2)
In Example 1, the inner conductor 2 is a silver-plated annealed copper wire 7 / 0.05 having an outer diameter of 0.15 mm, and the dielectric 3 is a PFA resin having a wall thickness of 0.125 mm and an outer diameter of 0.40 mm.
The shield layer 6 is formed by vertically attaching a copper polyester tape having a width of 1.20 mm and a thickness of 0.01 mm, and two substantially flat square timbers 5 made of silver-plated annealed copper wire having a width of W0.60 mm and a thickness of T0.05 mm. Bundle them, arrange them in parallel so that they do not overlap each other, and wind them all at once. The winding angle of the substantially flat lumber 5 is 12 °.
The outer layer 5 is a PFA resin having a wall thickness of 0.05 mm and an outer diameter of 0.56 mm.

実施例2は、実施例1のうち、略平角材5の寸法は、幅W0.16mm、厚さT0.02mm、持ち数8本である。 In Example 2, in Example 1, the dimensions of the substantially flat lumber 5 are a width W0.16 mm, a thickness T0.02 mm, and a number of holdings of eight.

実施例3は、実施例1のうち、誘電体外径は0.60mmであり、略平角材5の寸法は、幅W0.08mm、厚さT0.01mm、持ち数24本とある。 In Example 3, the outer diameter of the dielectric is 0.60 mm, and the dimensions of the substantially flat lumber 5 are width W0.08 mm, thickness T0.01 mm, and number of holdings 24.

実施例4は、実施例1のうち、誘電体外径は0.80mmであり、略平角材5の寸法を、幅W0.08mm、厚さT0.01mm、持ち数30本である。 In the fourth embodiment, the outer diameter of the dielectric is 0.80 mm, and the dimensions of the substantially flat square lumber 5 are a width W0.08 mm, a thickness T0.01 mm, and a number of 30 pieces.

比較例1は、実施例1のうち、誘電体外径は0.34mmであり、略平角材5の寸法は、幅W0.60mm、厚さT0.05mm、持ち数2本である。 In Comparative Example 1, in Example 1, the outer diameter of the dielectric is 0.34 mm, and the dimensions of the substantially flat square lumber 5 are a width W of 0.60 mm, a thickness of T0.05 mm, and two holdings.

比較例2は、実施例1のうち、誘電体外径は0.90mmであり、略平角材5の寸法は、幅W0.08mm、厚さT0.01mm、持ち数30本である。 In Comparative Example 2, in Example 1, the outer diameter of the dielectric is 0.90 mm, and the dimensions of the substantially flat lumber 5 are a width W0.08 mm, a thickness T0.01 mm, and a number of 30 pieces.

従来例1は、シールド構造は、一般的な編組構造であり、外層5の外径は0.81mmである。(誘電体の外径は、実施例2と同等サイズ、かつ、特性インピーダンスは50Ωに調整される。) In Conventional Example 1, the shield structure is a general braided structure, and the outer diameter of the outer layer 5 is 0.81 mm. (The outer diameter of the dielectric is the same size as in Example 2, and the characteristic impedance is adjusted to 50Ω.)

従来例2は、シールド構造は、一般的な横巻き構造であり、外層5の外径は0.64mmである。(誘電体の外径は、実施例2と同等サイズ、かつ、特性インピーダンスは50Ωに調整される。) In Conventional Example 2, the shield structure is a general horizontal winding structure, and the outer diameter of the outer layer 5 is 0.64 mm. (The outer diameter of the dielectric is the same size as in Example 2, and the characteristic impedance is adjusted to 50Ω.)

実施例2及び従来例1、2について、電気特性(減衰量、反射損失(VSWR)、クロストーク)の評価を行い、結果を図5〜図7に示す。 The electrical characteristics (attenuation amount, return loss (VSWR), crosstalk) of Examples 2 and Conventional Examples 1 and 2 were evaluated, and the results are shown in FIGS. 5 to 7.

(電気特性評価方法)
ケーブル長:1000mm(測定用コネクタ付)
測定器:ネットワークアナライザー
周波数範囲:0−12GHz
(Electrical characteristic evaluation method)
Cable length: 1000 mm (with measurement connector)
Measuring instrument: Network analyzer Frequency range: 0-12GHz

図5〜図7より、本願発明の実施例2は、従来例1の編組構造、及び、従来例2の横巻構造と比較し、細径にも関わらず、減衰量、反射損失(VSWR)、クロストーク、いずれの電気特性においても、優れていることが分かる。 From FIGS. 5 to 7, in the second embodiment of the present invention, as compared with the braided structure of the conventional example 1 and the horizontal winding structure of the conventional example 2, the attenuation amount and the reflection loss (VSWR) are reduced in spite of the small diameter. , Crosstalk, all of which are excellent in electrical characteristics.

電気特性に優れる理由として、本願発明の実施例2は、シールド層6として、従来の丸線を用いる代わりに略平角材5を使用することで細径化する一方、略平角材の内側に銅ポリエステルテープの縦添えを施すことで、減衰量、反射損失(VSWR)に寄与する点が挙げられる。また、略平角材5が密に並列配置されるため、平滑性に優れる点も、減衰量、VSWRに加え、クロストークにおいても寄与すると考えらえる。 As a reason for the excellent electrical characteristics, in Example 2 of the present invention, the diameter is reduced by using a substantially flat square timber 5 instead of using a conventional round wire as the shield layer 6, while copper is used inside the substantially flat square timber. The vertical attachment of polyester tape contributes to the amount of attenuation and reflection loss (VSWR). Further, since the substantially flat square timbers 5 are densely arranged in parallel, it is considered that the excellent smoothness also contributes to the crosstalk in addition to the attenuation amount and VSWR.

実施例1乃至4、比較例1乃至2、及び、従来例1乃至2について、柔軟性及び外観の評価結果を表1に示す。 Table 1 shows the evaluation results of flexibility and appearance of Examples 1 to 4, Comparative Examples 1 and 2, and Conventional Examples 1 and 2.

Figure 0006893419
Figure 0006893419

実施例1乃至4はいずれも、柔軟性や生産性について優位性が確認された。 All of Examples 1 to 4 were confirmed to be superior in terms of flexibility and productivity.

特に、本願発明の実施例2及び3においては、D/Wが2〜8、または、D/Tが8〜60であり、略平角材5を巻き付けた構造であっても、従来例1乃至4と同等の柔軟性を維持しつつ、略平角材5の断線や乗り越え等による凹凸発生がなく、生産性(外観)においても優れていると言える。 In particular, in Examples 2 and 3 of the present invention, even if the D / W is 2 to 8 or the D / T is 8 to 60 and the structure is such that the substantially flat lumber 5 is wound, the conventional examples 1 to 1 to 3 While maintaining the same flexibility as No. 4, it can be said that the flat lumber 5 is excellent in productivity (appearance) because there is no unevenness due to disconnection or overcoming.

比較例1と比較し、D/Wが0.7以上、あるいは、D/Tが8以上であると、略平角材による柔軟性への影響が低く抑えられるとともに、持ち数を2本以上とすることができることから、巻き付ける際の張力を適正に保ち、外観不良を低減、生産性の向上に寄与する。 Compared with Comparative Example 1, when the D / W is 0.7 or more, or the D / T is 8 or more, the influence of the substantially flat lumber on the flexibility can be suppressed to a low level, and the number of holdings is 2 or more. Therefore, the tension at the time of winding is maintained appropriately, the appearance defect is reduced, and the productivity is improved.

比較例2と比較し、D/Wが10以下、あるいは、D/Tが80以下であると、略平角材5の持ち数を少なくでき、重なりによる凹凸発生等外観不良を低減、生産性の向上に寄与する。 When the D / W is 10 or less or the D / T is 80 or less as compared with Comparative Example 2, the number of substantially flat square timbers 5 can be reduced, appearance defects such as unevenness due to overlapping can be reduced, and productivity can be improved. Contribute to improvement.

以上より、本願発明の実施例は、従来例1の編組構造、従来例2の横巻き構造と比較し、細径にも関わらず、減衰量、VSWR、クロストーク等の電気特性に優れ、かつ、略平角材5を使用するにも関わらず、従来例と同等の柔軟性を有し、生産性にも優れている。 From the above, the embodiment of the present invention is superior to the braided structure of Conventional Example 1 and the horizontal winding structure of Conventional Example 2 in spite of its small diameter, and is excellent in electrical characteristics such as attenuation, VSWR, and crosstalk. Despite the fact that the substantially flat lumber 5 is used, it has the same flexibility as the conventional example and is excellent in productivity.

本発明の同軸ケーブルは、容易に細径化されながらも、減衰量等の高周波特性に優れ、かつ、柔軟性においても優れるので、情報通信機器、通信端末機器、計測機器等の高周波部品の信号伝達線路、および内視鏡、超音波診断装置等の医療用器具の機器配線路のみならず、小型電子機器用の信号伝達線路全般において有用である。 The coaxial cable of the present invention has excellent high-frequency characteristics such as attenuation while being easily reduced in diameter, and is also excellent in flexibility. Therefore, signals of high-frequency components such as information communication equipment, communication terminal equipment, and measuring equipment are also excellent. It is useful not only for transmission lines and equipment wiring lines for medical instruments such as endoscopes and ultrasonic diagnostic devices, but also for signal transmission lines for small electronic devices in general.

1 同軸ケーブル
2 内部導体
3 誘電体層
4 テープ材
5 略平角材
6 シールド層
7 外層
W 略平角材の幅
T 略平角材の厚さ
α 略平角材の巻き付け角度
X 測定長(柔軟性の指標)

1 Coaxial cable 2 Inner conductor 3 Dielectric layer 4 Tape material 5 Approximately flat square lumber 6 Shield layer 7 Outer layer W Approximately flat lumber width T Approximately flat lumber thickness α Approximately flat lumber winding angle X Measurement length (index of flexibility) )

Claims (9)

シールド層を有する同軸ケーブルにおいて、
該シールド層の少なくとも一層は、複数本からなる略平角形状の導体(略平角材)を互いに重ならないように並列に配置された状態で巻きつけられる構造であることを特徴とする同軸ケーブル。
In a coaxial cable with a shield layer
A coaxial cable characterized in that at least one layer of the shield layer has a structure in which a plurality of substantially flat conductors (substantially flat square members) are wound in a state of being arranged in parallel so as not to overlap each other.
シールド層を有する同軸ケーブルにおいて、In a coaxial cable with a shield layer
該シールド層の少なくとも一層は、複数本からなる略平角形状の導体(略平角材)を互いに重ならないように並列に配置された状態で巻きつけられる構造であって、At least one layer of the shield layer has a structure in which a plurality of substantially flat conductors (substantially flat square members) are wound in a state of being arranged in parallel so as not to overlap each other.
同軸ケーブルの線方向に対する、略平角材の巻きつけ角度α(<90°)は、10°〜40°であることを特徴とする同軸ケーブル。A coaxial cable characterized in that the winding angle α (<90 °) of a substantially flat square timber with respect to the line direction of the coaxial cable is 10 ° to 40 °.
シールド層を有する同軸ケーブルにおいて、
該シールド層は、導電性を有するテープ材を縦添えし、
該テープ材の上に略平角材を巻きつける構造を有することを特徴とする、
請求項1または2に記載の同軸ケーブル。
In a coaxial cable with a shield layer
The shield layer is vertically attached with a conductive tape material.
Characterized in that it has a winding attaching structure the substantially flat wire over said tape,
The coaxial cable according to claim 1 or 2.
同軸ケーブルを構成する誘電体外径D、及び、シールド層を構成する略平角材の幅Wは、以下の関係式を満たすことを特徴とする、
請求項1乃至3のいずれか1項に記載の同軸ケーブル。

(関係式)0.7≦D/W≦10
The dielectric outer diameter D constituting the coaxial cable and the width W of the substantially flat square lumber constituting the shield layer satisfy the following relational expressions.
The coaxial cable according to any one of claims 1 to 3.

(Relational expression) 0.7 ≤ D / W ≤ 10
同軸ケーブルを構成する誘電体外径D、及び、シールド層を構成する略平角材の厚みTは、以下の関係式を満たすことを特徴とする、
請求項1乃至4のいずれか1項に記載の同軸ケーブル。

(関係式)8≦D/T≦80
The dielectric outer diameter D constituting the coaxial cable and the thickness T of the substantially flat square lumber constituting the shield layer satisfy the following relational expressions.
The coaxial cable according to any one of claims 1 to 4.

(Relational expression) 8 ≤ D / T ≤ 80
シールド層を構成する略平角材の遮蔽密度は80%以上であることを特徴とする、
請求項1乃至5のいずれか1項に記載の同軸ケーブル。
The shielding density of the substantially flat lumber constituting the shield layer is 80% or more.
The coaxial cable according to any one of claims 1 to 5.
巻きつけられた略平角材間の隙間距離は、100μm以下であることを特徴とする、
請求項1乃至6のいずれか1項に記載の同軸ケーブル。
The gap distance between the wound substantially flat lumber is 100 μm or less.
The coaxial cable according to any one of claims 1 to 6.
シールド層を構成するテープ材は、幅方向の両端が重なり合わない状態で縦添えされることを特徴とする、
請求項1乃至のいずれか1項に記載の同軸ケーブル。
The tape material constituting the shield layer is characterized in that both ends in the width direction are vertically attached without overlapping.
The coaxial cable according to any one of claims 1 to 7.
縦添されたテープ材において、テープが施されていない隙間距離は、200μm以下であることを特徴とする、
請求項1乃至のいずれか1項に記載の同軸ケーブル。
In the vertically attached tape material, the gap distance to which the tape is not applied is 200 μm or less.
The coaxial cable according to any one of claims 1 to 8.
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