WO2011074693A1 - High-speed differential quad cable - Google Patents

High-speed differential quad cable Download PDF

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Publication number
WO2011074693A1
WO2011074693A1 PCT/JP2010/072842 JP2010072842W WO2011074693A1 WO 2011074693 A1 WO2011074693 A1 WO 2011074693A1 JP 2010072842 W JP2010072842 W JP 2010072842W WO 2011074693 A1 WO2011074693 A1 WO 2011074693A1
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cable
outer periphery
speed differential
layer
signal line
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French (fr)
Japanese (ja)
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勝雄 下沢
雅人 久保
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Junkosha Co Ltd
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Junkosha Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00—Communication cables or conductors
    • H01B11/02—Cables with twisted pairs or quads
    • H01B11/04—Cables with twisted pairs or quads with pairs or quads mutually positioned to reduce cross-talk

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  • the present invention relates to a high-speed differential quad cable that performs differential transmission of signals using a 4-core signal line.
  • the present invention has been made in view of the above-described problems, and an object of the present invention is to provide a high-speed differential quad cable that can suppress deterioration of characteristic impedance and attenuation at the initial sliding stage of the cable.
  • the signal wire having the dielectric layer on the outer periphery of the inner conductor obtained by twisting a plurality of conductors is twisted in the right direction or the left direction.
  • a fluororesin having good high-frequency characteristics such as porous polytetrafluoroethylene (EPTFE) or expanded PFA (tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer) can be used.
  • EPTFE porous polytetrafluoroethylene
  • expanded PFA tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer
  • a fluororesin such as EPTFE can be used.
  • the first and second winding layers 15 and 17 are made of tape formed by laminating ALPET, that is, aluminum foil and polyethylene terephthalate (PET) through polyvinyl chloride (PVC) as an adhesive layer. A tape can be used.
  • an EPTFE tape is wound to surround the dielectric layer 12 of the four-core signal line 10 and the outside of the interposition 13 to form the buffer layer 14.
  • a first winding layer 15 is formed by spirally winding a metallized tape so as to surround the outer periphery of the buffer layer 14 (spiral winding).
  • the shield layer 16 is formed by twisting a plurality of conducting wires 16 a on the outer periphery of the first winding layer 15 in the right direction or the left direction, which is the same direction as the twisting direction of the four-core signal line 10.
  • the second winding layer 17 is formed by spirally winding a metallized tape so as to surround the outer periphery of the shield layer 16 (spiral winding).
  • the EPTFE interpositions 13 are arranged at four positions between the adjacent signal lines 10 on the outer periphery of the four-core signal line 10. Then, EPTFE is coated to form a buffer layer 14 so as to have a thickness of 0.18 mm so as to surround the outer sides of the dielectric layer 12 and the interposition 13 of the four signal lines 10. Then, an ALPET formed by laminating an aluminum foil having a thickness of 10 ⁇ m and a PET having a thickness of 12 ⁇ m via a PVC (adhesive layer) having a thickness of 2 to 3 ⁇ m so as to surround the outer periphery of the buffer layer 14 is spirally formed.
  • the first winding layer 15 is formed by winding (spiral winding).
  • FIG. 2 shows that the high-speed differential quad cable 1 of the example and the high-speed differential quad cable of the comparative example are set to 1 m, connectors are connected to both ends of the cable, and the mandrel (bending radius is 15 mm) of the sliding tester is set.
  • the change in attenuation (dB / m) when the characteristic impedance Zo ( ⁇ ) and the frequency (GHz) when the sliding test is performed 5000 times at 100 times / minute are 0.1 GHz and 1.0 GHz.
  • FIG. As is apparent from FIG. 2, in the high-speed differential quad cable of the comparative example, the characteristic impedance Zo ( ⁇ ) had an initial value of 100.38 ( ⁇ ) but after 5000 sliding tests. It was 109.2 ( ⁇ ), and the rate of change was 8.8%.

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Abstract

A high-speed differential quad cable (1) comprises four signal lines (10) twisted rightwards or leftwards and each including an inner conductor (11) formed by twisting a plurality of lead wires (11a) and a dielectric layer (12) formed around the outer circumference of the inner conductor; and an outer conductor (16) disposed outside the signal lines and including a plurality of lead wires (16a) that are twisted in the same direction as the twisting direction of the four signal lines. It is inferred that the behavior of the four signal lines will be similar to that of the outer conductor when the cable slides since the twisting direction of the four signal lines and that of the outer conductor are the same as described above. As a result, degradation of the characteristic impedance and the attenuation of the cable in the early stage of sliding of the cable can be suppressed.

Description

高速差動用クワッドケーブルHigh-speed differential quad cable

　本発明は、４芯の信号線を用いて信号の差動伝送を行う高速差動用クワッドケーブルに関する。 The present invention relates to a high-speed differential quad cable that performs differential transmission of signals using a 4-core signal line.

　従来、データ伝送が高速ビットレートで行われる場合に用いられる伝送線路として、高速差動ケーブルがある。このような高速差動ケーブルは、特表平９−５１１３５９号公報に示されており、この特表平９−５１１３５９号公報には、複合作動ペアケーブル（クワッドケーブル又はカッドケーブルともいう）が開示されている。このクワッドケーブルは、信号導線を絶縁体により被覆した４本の絶縁電線を充填芯材を中心に環状に配し、絶縁電線を囲んで絶縁スペーサを配している。そして、絶縁スペーサの外周に編組導体又はアルミ化されたポリエステルからなるシールド導体を配し、その外周を外被で覆った構成となっている。このようなクワッドケーブルはツインナクスケーブルと比べ細線化可能であるという利点を有している。
　例えば、ロボットに搭載されているカメラは、ロボットの動作に合わせて回転や昇降等の動作が可能なように構成されている。このため、一例として挙げるカメラリンクケーブルは、カメラの動作に追従して屈曲して摺動することになる。ところが、特表平９−５１１３５９号公報に開示されているクワッドケーブルでは、ケーブルの摺動初期に特性インピーダンスや減衰量が例えば著しく上昇して変動し、電気特性の悪化現象が発生するため、摺動されるケーブルには適用困難である。この問題を解決するために、本発明者は、鋭意、研究、開発を続けた結果、摺動初期における特性インピーダンスや減衰量の悪化を防止できるクワッドケーブルの構成を見出し、本発明を完成するに至ったものである。 Conventionally, there is a high-speed differential cable as a transmission line used when data transmission is performed at a high bit rate. Such a high-speed differential cable is disclosed in Japanese Patent Laid-Open No. 9-511359, and this Japanese Patent Laid-Open No. 9-511359 discloses a composite operating pair cable (also referred to as a quad cable or a quad cable). Has been. In this quad cable, four insulated wires in which signal conductors are covered with an insulator are arranged in an annular shape around a filling core material, and an insulating spacer is arranged around the insulated wires. Then, a braided conductor or a shield conductor made of aluminized polyester is arranged on the outer periphery of the insulating spacer, and the outer periphery is covered with a jacket. Such quad cables have the advantage that they can be made thinner than twinax cables.
For example, a camera mounted on a robot is configured to be able to perform operations such as rotation and elevation according to the operation of the robot. For this reason, the camera link cable mentioned as an example will bend and slide following the operation of the camera. However, in the quad cable disclosed in Japanese Patent Publication No. 9-511359, the characteristic impedance and the attenuation amount are increased and fluctuated, for example, at the initial stage of the sliding of the cable, resulting in deterioration of electrical characteristics. It is difficult to apply to cables that are moved. In order to solve this problem, the present inventor has intensively researched and developed, and as a result, has found a configuration of a quad cable that can prevent deterioration of characteristic impedance and attenuation in the early stage of sliding, and completes the present invention. It has come.

　本発明は、上記のような課題に鑑みなされたものであり、その目的は、ケーブルの摺動初期における特性インピーダンスや減衰量の悪化を抑制できる高速差動用クワッドケーブルを提供することにある。
　上記目的達成のため、本発明の高速差動用クワッドケーブルでは、複数本の導線を撚り合わせた内部導体の外周に誘電体層を設けた信号線を４芯、右方向もしくは左方向に撚り合わせ、前記４芯の信号線の外周にバッファ層を設け、前記バッファ層の外周にテープ状部材を螺旋状に巻き付けた第１の巻回層を設け、前記第１の巻回層の外周に複数本の導線を前記４芯の信号線の撚り方向と同一方向に撚り合わせた外部導体を設け、前記外部導体の外周にテープ状部材を螺旋状に巻き付けた第２の巻回層を設け、前記第２の巻回層の外周に外被を設けたことを特徴としている。
　このように、４芯の信号線の撚り方向と外部導体の撚り方向とが同一方向となるように構成したので、ケーブルの摺動時の４芯の信号線と外部導体の挙動が近似したものとなると推測され、ケーブルの摺動初期における特性インピーダンスや減衰量の悪化を抑制することができる。
　また、前記４芯の信号線の中心および該信号線と前記バッファ層の間には、高周波特性の良好な部材が介在されている。このように、高周波特性の良好な部材を介在させることにより、信号線同士の摺動を改善することができ、ケーブルの摺動初期における特性インピーダンスや減衰量の悪化をさらに抑制することができる。 The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a high-speed differential quad cable that can suppress deterioration of characteristic impedance and attenuation at the initial sliding stage of the cable.
In order to achieve the above object, in the high-speed differential quad cable according to the present invention, the signal wire having the dielectric layer on the outer periphery of the inner conductor obtained by twisting a plurality of conductors is twisted in the right direction or the left direction. A buffer layer is provided on the outer periphery of the four-core signal line, a first winding layer in which a tape-like member is spirally wound is provided on the outer periphery of the buffer layer, and a plurality of windings are provided on the outer periphery of the first winding layer. An outer conductor in which two conductive wires are twisted in the same direction as the twisting direction of the four-core signal line, a second winding layer in which a tape-like member is spirally wound around the outer conductor, It is characterized in that a jacket is provided on the outer periphery of the second winding layer.
In this way, since the twist direction of the 4-core signal line and the twist direction of the external conductor are the same direction, the behavior of the 4-core signal line and the external conductor when the cable slides is approximated. Thus, it is possible to suppress the deterioration of the characteristic impedance and the attenuation amount in the initial sliding of the cable.
Further, a member having good high frequency characteristics is interposed between the center of the four-core signal line and between the signal line and the buffer layer. Thus, by interposing a member having good high frequency characteristics, it is possible to improve the sliding between the signal lines, and to further suppress the deterioration of the characteristic impedance and the attenuation amount in the initial sliding of the cable.

　第１図は、本発明の実施形態に係る高速差動用クワッドケーブルの軸と直交する方向の図である。
　第２図は、実施例および比較例の高速差動用クワッドケーブルを摺動試験したときの特性インピーダンスおよび減衰量の変化を示す図である。 FIG. 1 is a view in a direction perpendicular to the axis of a high-speed differential quad cable according to an embodiment of the present invention.
FIG. 2 is a diagram showing changes in characteristic impedance and attenuation when a sliding test is performed on the high-speed differential quad cables of Examples and Comparative Examples.

　以下に説明する実施形態は特許請求の範囲に係る発明を限定するものではなく、また実施形態の中で説明されている特徴の組み合わせの全てが本発明の成立に必須であるとは限らない。
　第１図は、本発明の実施形態に係る高速差動用クワッドケーブルの軸と直交する方向の図である。この高速差動用クワッドケーブル１は、複数本の導線１１ａを撚り合わせた中心導体１１（内部導体）の外周に誘電体層１２を形成した信号線１０を、右方向もしくは左方向に４芯撚り合わせ、その際、４芯の信号線１０の中心に介在１３を配置している。さらに、４芯の信号線１０の外周の隣接する信号線１０間にも介在１３を配置し、４芯の信号線１０の誘電体層１２および介在１３の外側にバッファ層１４を形成する。
　このバッファ層１４の外周にテープ状部材でなる第１の巻回層１５を形成し、第１の巻回層１５の外周に複数本の導線１６ａを４芯の信号線１０の撚り方向と同一方向に撚り合わせたシールド層（外部導体）１６を形成する。さらに、シールド層１６の外周にテープ状部材でなる第２の巻回層１７を形成し、第２の巻回層１７の外周にジャケット（外被）１８を形成した構成となっている。
　中心導体１１の導線１１ａは、例えば銀めっき高抗張力合金線が使用可能である。誘電体層１２には、例えば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）等のフッ素樹脂が使用可能である。介在１３には、例えば多孔質ポリテトラフルオロエチレン（ＥＰＴＦＥ）、延伸ＰＦＡ（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）等の高周波特性が良好なフッ素樹脂が使用可能である。バッファ層１４には、例えばＥＰＴＦＥ等のフッ素樹脂が使用可能である。
　第１および第２の巻回層１５，１７には、ＡＬＰＥＴ、即ちアルミ箔とポリエチレンテレフタレート（ＰＥＴ）とを、接着層としてポリ塩化ビニル（ＰＶＣ）を介して積層してテープ状に形成した金属化テープが使用可能である。第１および第２の巻回層１５，１７は、バッファ層１４およびシールド層１６を包囲するように外周に螺旋状（いわゆる、スパイラル巻き）に設けられる。なお、第１および第２の巻回層１５，１７は、上記したような金属化テープを用いたが、例えば、ＰＥＴに銅、アルミ等の金属を蒸着した金属蒸着テープあるいはアルミ箔、銅箔等の金属箔をテープ化した金属テープを用いても良いことは勿論のことである。シールド層１６の導線１６ａは、例えば錫メッキ錫入り合金線が使用可能である。ジャケット１８には、例えばＦＥＰが使用可能である。
　このような構成の高速差動用クワッドケーブル１は以下の手順により作製される。先ず、複数本の導線１１ａを撚って中心導体１１とし、この中心導体１１の外周に押出機（図示せず）を用いてＦＥＰを押出し被覆して第１の誘電体層１２を形成した信号線１０を作製する。次に、４本の信号線１０を誘電体層１２が軸方向に接触するように、右方向もしくは左方向に撚り合わせ、その際、４芯の信号線１０の中心にＥＰＴＦＥもしくは延伸ＰＦＡでなる介在１３を配置し、さらに、４芯の信号線１０の外周の隣接する信号線１０間にも介在１３を配置する。
　そして、４芯の信号線１０の誘電体層１２および介在１３の外側を包囲するように例えばＥＰＴＦＥテープを巻回してバッファ層１４を形成する。このバッファ層１４の外周を包囲するように金属化テープを螺旋状に巻回（スパイラル巻き）して第１の巻回層１５を形成する。そして、第１の巻回層１５の外周に複数本の導線１６ａを４芯の信号線１０の撚り方向と同一方向である右方向もしくは左方向に撚ってシールド層１６を形成する。このシールド層１６の外周を包囲するように金属化テープを螺旋状に巻回（スパイラル巻き）して第２の巻回層１７を形成する。最後に、第２の巻回層１７の外周に絶縁テープを巻き付けて、もしくは押出機を用いて絶縁体を押出し被覆してジャケット１８を形成する。以上により、高速差動用クワッドケーブル１が完成する。
　以上のような構成の高速差動用クワッドケーブル１によれば、４芯の信号線１０の撚り方向とシールド層１６の導線１６ａの撚り方向とが同一方向となるように構成したので、ケーブルの摺動時の４芯の信号線１０とシールド層１６の挙動が近似したものとなると推測され、ケーブルの摺動初期における特性インピーダンスや減衰量などの電気特性の悪化を抑制することができる。また、信号線１０の中心および該信号線１０とバッファ層１４の間に、高周波特性の良好な介在１３を配置しているので、信号線１０同士の摺動を改善することができ、ケーブルの摺動初期における特性インピーダンスや減衰量の悪化をさらに抑制することができる。
　次に、実施例として本実施形態の高速差動用クワッドケーブル１および比較例として従来の高速差動用クワッドケーブルを作製して摺動試験を行い、それらのインピーダンスおよび減衰量を測定したので、この測定結果について第２図を参照して説明する。ここで、測定に使用した実施例の高速差動用クワッドケーブル１は、以下のようにして作製されている。中心導体１１の導線１１ａとして外径０．０７９ｍｍの銀めっき高抗張力合金線を１９本用意し、該導線１１ａを撚って中心導体１１とする。そして、この中心導体１１の外周に外径０．６５ｍｍとなるように図示しない押出機を用いてＦＥＰを押出し被覆して誘電体層１２を形成し信号線１０とする。
　４本の信号線１０を誘電体層１２が軸方向に接触するように、右方向もしくは左方向に撚り合わせ、その際、４芯の信号線１０の中心の１箇所にＥＰＴＦＥの介在１３を配置し、さらに、４芯の信号線１０の外周の隣接する信号線１０間の４箇所にもＥＰＴＦＥの介在１３を配置する。そして、４本の信号線１０の誘電体層１２および介在１３の外側を包囲するように、厚さ０．１８ｍｍとなるようにＥＰＴＦＥを被覆してバッファ層１４を形成する。
　そして、バッファ層１４の外周を包囲するように、厚さ１０μｍのアルミ箔と厚さ１２μｍのＰＥＴとを厚さ２~３μｍのＰＶＣ（接着層）を介して積層してなるＡＬＰＥＴを螺旋状に巻回（スパイラル巻き）して第１の巻回層１５を形成する。そして、導線１６ａとして外径０．０８ｍｍの錫メッキ錫入り合金線を７１本用意し、第１の巻回層１５の外周に４芯の信号線１０の撚り方向と同一方向である右方向もしくは左方向に撚ってシールド層１６を形成する。
　さらに、シールド層１６の外周を包囲するように、厚さ１０μｍのアルミ箔と厚さ１２μｍのＰＥＴとを厚さ２~３μｍのＰＶＣ（接着層）を介して積層してなるＡＬＰＥＴを螺旋状に巻回（スパイラル巻き）して第２の巻回層１７を形成する。最後に、第２の巻回層１７の外周を包囲するように、厚さ０．０５ｍｍのＦＥＰを被覆してジャケット１８を形成する。一方、測定に使用した比較例の高速差動用クワッドケーブルは、上述の実施例の高速差動用クワッドケーブル１と略同一構成であるが、７１本の導線１６ａを第１の巻回層の外周に４芯の信号線の撚り方向と逆方向である方向に撚ってシールド層を形成した点のみ異なる構成となっている。
　第２図は、実施例の高速差動用クワッドケーブル１および比較例の高速差動用クワッドケーブルを１ｍとしてケーブル両端にコネクタを接続し、摺動試験機のマンドレル（曲げ半径１５ｍｍ）にセットして１００回／分で５０００回の摺動試験を行ったときの特性インピーダンスＺｏ（Ω）および周波数（ＧＨｚ）を０．１ＧＨｚと１．０ＧＨｚとしたときの減衰量（ｄＢ／ｍ）の変化を示す図である。
　第２図から明らかなように、比較例の高速差動用クワッドケーブルでは、特性インピーダンスＺｏ（Ω）は、初期値が１００．３８（Ω）であったものが５０００回の摺動試験後は１０９．２（Ω）となり、変化率は８．８％であった。一方、実施例の高速差動用クワッドケーブル１では、特性インピーダンスＺｏ（Ω）は、初期値が１００．８（Ω）であったものが５０００回の摺動試験後は１０２．８９（Ω）となり、変化率は２．１％と比較例の高速差動用クワッドケーブルと比べ良好な値を示している。
　また、比較例の高速差動用クワッドケーブルでは、０．１ＧＨｚの周波数（ＧＨｚ）の減衰量（ｄＢ／ｍ）は、初期値が０．３４３（ｄＢ／ｍ）であったものが５０００回の摺動試験後は０．４０５（ｄＢ／ｍ）となり、変化率は１８．１％であった。また、１．０ＧＨｚの周波数（ＧＨｚ）の減衰量（ｄＢ／ｍ）は、初期値が１．３２（ｄＢ／ｍ）であったものが５０００回の摺動試験後は１．７４（ｄＢ／ｍ）となり、変化率は３１．８％であった。
　一方、実施例の高速差動用クワッドケーブル１では、０．１ＧＨｚの周波数（ＧＨｚ）の減衰量（ｄＢ／ｍ）は、初期値が０．３７５（ｄＢ／ｍ）であったものが５０００回の摺動試験後は０．３７６（ｄＢ／ｍ）となり、変化率は０．３％と比較例の高速差動用クワッドケーブルと比べ非常に良好な値を示している。また、１．０ＧＨｚの周波数（ＧＨｚ）の減衰量（ｄＢ／ｍ）は、初期値が１．１７（ｄＢ／ｍ）であったものが５０００回の摺動試験後は１．２８（ｄＢ／ｍ）となり、変化率は９．４％とこれも比較例の高速差動用クワッドケーブルと比べ非常に良好な値を示している。
　以上説明したように、本実施形態の高速差動用クワッドケーブル１によれば、ケーブルの摺動初期における特性インピーダンスや減衰量の悪化を抑制することができるため、摺動されるケーブル、例えばロボットに搭載されているカメラリンクケーブルに適用可能である。 The embodiments described below do not limit the invention according to the claims, and all combinations of features described in the embodiments are not necessarily essential for the establishment of the present invention.
FIG. 1 is a view in a direction perpendicular to the axis of a high-speed differential quad cable according to an embodiment of the present invention. This high-speed differential quad cable 1 has a signal wire 10 in which a dielectric layer 12 is formed on the outer periphery of a central conductor 11 (inner conductor) obtained by twisting a plurality of conducting wires 11a, and a four-core twisted right or left direction. At this time, the interposition 13 is disposed at the center of the four-core signal line 10. Further, an intervening 13 is also arranged between adjacent signal lines 10 on the outer periphery of the 4-core signal line 10, and a buffer layer 14 is formed outside the dielectric layer 12 and the interposition 13 of the 4-core signal line 10.
A first winding layer 15 made of a tape-like member is formed on the outer periphery of the buffer layer 14, and a plurality of conductors 16 a are arranged on the outer periphery of the first winding layer 15 in the same twisting direction as the four-core signal line 10. A shield layer (outer conductor) 16 twisted in the direction is formed. Further, a second winding layer 17 made of a tape-like member is formed on the outer periphery of the shield layer 16, and a jacket (outer jacket) 18 is formed on the outer periphery of the second winding layer 17.
As the conducting wire 11a of the central conductor 11, for example, a silver-plated high strength alloy wire can be used. For the dielectric layer 12, for example, a fluororesin such as tetrafluoroethylene-hexafluoropropylene copolymer (FEP) can be used. For the interposition 13, for example, a fluororesin having good high-frequency characteristics such as porous polytetrafluoroethylene (EPTFE) or expanded PFA (tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer) can be used. For the buffer layer 14, for example, a fluororesin such as EPTFE can be used.
The first and second winding layers 15 and 17 are made of tape formed by laminating ALPET, that is, aluminum foil and polyethylene terephthalate (PET) through polyvinyl chloride (PVC) as an adhesive layer. A tape can be used. The first and second winding layers 15 and 17 are provided in a spiral shape (so-called spiral winding) on the outer periphery so as to surround the buffer layer 14 and the shield layer 16. The first and second winding layers 15 and 17 use the metallized tape as described above. For example, a metal vapor-deposited tape obtained by vapor-depositing a metal such as copper or aluminum on PET, an aluminum foil, or a copper foil. It goes without saying that a metal tape obtained by tapering a metal foil such as the above may be used. As the conducting wire 16a of the shield layer 16, for example, an alloy wire containing tin plating tin can be used. For the jacket 18, for example, FEP can be used.
The high-speed differential quad cable 1 having such a configuration is manufactured by the following procedure. First, a signal in which a plurality of conductive wires 11a are twisted to form a central conductor 11, and FEP is extruded and coated on the outer periphery of the central conductor 11 using an extruder (not shown) to form a first dielectric layer 12. Wire 10 is made. Next, the four signal lines 10 are twisted rightward or leftward so that the dielectric layer 12 contacts in the axial direction. At this time, the center of the four-core signal line 10 is made of EPTFE or stretched PFA. The intervening 13 is disposed, and the intervening 13 is also disposed between adjacent signal lines 10 on the outer periphery of the four-core signal line 10.
Then, for example, an EPTFE tape is wound to surround the dielectric layer 12 of the four-core signal line 10 and the outside of the interposition 13 to form the buffer layer 14. A first winding layer 15 is formed by spirally winding a metallized tape so as to surround the outer periphery of the buffer layer 14 (spiral winding). Then, the shield layer 16 is formed by twisting a plurality of conducting wires 16 a on the outer periphery of the first winding layer 15 in the right direction or the left direction, which is the same direction as the twisting direction of the four-core signal line 10. The second winding layer 17 is formed by spirally winding a metallized tape so as to surround the outer periphery of the shield layer 16 (spiral winding). Finally, an insulating tape is wound around the outer periphery of the second winding layer 17 or an insulator is extruded and coated using an extruder to form the jacket 18. Thus, the high-speed differential quad cable 1 is completed.
According to the high-speed differential quad cable 1 configured as described above, since the twist direction of the four-core signal line 10 and the twist direction of the conductor 16a of the shield layer 16 are the same direction, It is presumed that the behavior of the four-core signal line 10 and the shield layer 16 at the time of sliding is approximate, and deterioration of electrical characteristics such as characteristic impedance and attenuation at the initial stage of sliding of the cable can be suppressed. Further, since the interposition 13 having good high frequency characteristics is disposed between the center of the signal line 10 and between the signal line 10 and the buffer layer 14, the sliding of the signal lines 10 can be improved, and the cable It is possible to further suppress the deterioration of the characteristic impedance and the attenuation amount at the initial stage of sliding.
Next, the high-speed differential quad cable 1 of the present embodiment as an example and a conventional high-speed differential quad cable as a comparative example were manufactured and subjected to a sliding test, and their impedance and attenuation were measured. The measurement result will be described with reference to FIG. Here, the high-speed differential quad cable 1 of the embodiment used for the measurement is manufactured as follows. Nineteen silver-plated high tensile strength alloy wires having an outer diameter of 0.079 mm are prepared as the conductor 11a of the center conductor 11, and the conductor 11a is twisted to form the center conductor 11. Then, FEP is extruded and coated using an extruder (not shown) so that the outer diameter of the center conductor 11 is 0.65 mm on the outer periphery, and the dielectric layer 12 is formed as the signal line 10.
The four signal lines 10 are twisted rightward or leftward so that the dielectric layer 12 contacts in the axial direction, and an EPTFE interposition 13 is disposed at one center of the four-core signal line 10 at that time. Further, the EPTFE interpositions 13 are arranged at four positions between the adjacent signal lines 10 on the outer periphery of the four-core signal line 10. Then, EPTFE is coated to form a buffer layer 14 so as to have a thickness of 0.18 mm so as to surround the outer sides of the dielectric layer 12 and the interposition 13 of the four signal lines 10.
Then, an ALPET formed by laminating an aluminum foil having a thickness of 10 μm and a PET having a thickness of 12 μm via a PVC (adhesive layer) having a thickness of 2 to 3 μm so as to surround the outer periphery of the buffer layer 14 is spirally formed. The first winding layer 15 is formed by winding (spiral winding). Then, 71 tin-plated tin-containing alloy wires having an outer diameter of 0.08 mm are prepared as the conducting wire 16a, and the right direction that is the same direction as the twist direction of the 4-core signal wire 10 on the outer periphery of the first winding layer 15 or The shield layer 16 is formed by twisting in the left direction.
Further, an ALPET formed by laminating an aluminum foil having a thickness of 10 μm and a PET having a thickness of 12 μm via a PVC (adhesive layer) having a thickness of 2 to 3 μm so as to surround the outer periphery of the shield layer 16 is spirally formed. The second winding layer 17 is formed by winding (spiral winding). Finally, the jacket 18 is formed by covering FEP having a thickness of 0.05 mm so as to surround the outer periphery of the second wound layer 17. On the other hand, the high-speed differential quad cable of the comparative example used for the measurement has substantially the same configuration as the high-speed differential quad cable 1 of the above-described embodiment, but 71 conductors 16a are connected to the first winding layer. The only difference is that the shield layer is formed by twisting the outer periphery in a direction opposite to the twisting direction of the 4-core signal line.
FIG. 2 shows that the high-speed differential quad cable 1 of the example and the high-speed differential quad cable of the comparative example are set to 1 m, connectors are connected to both ends of the cable, and the mandrel (bending radius is 15 mm) of the sliding tester is set. The change in attenuation (dB / m) when the characteristic impedance Zo (Ω) and the frequency (GHz) when the sliding test is performed 5000 times at 100 times / minute are 0.1 GHz and 1.0 GHz. FIG.
As is apparent from FIG. 2, in the high-speed differential quad cable of the comparative example, the characteristic impedance Zo (Ω) had an initial value of 100.38 (Ω) but after 5000 sliding tests. It was 109.2 (Ω), and the rate of change was 8.8%. On the other hand, in the high-speed differential quad cable 1 of the example, the characteristic impedance Zo (Ω), which had an initial value of 100.8 (Ω), was 102.89 (Ω) after 5000 sliding tests. Thus, the rate of change is 2.1%, which is a better value than the high speed differential quad cable of the comparative example.
Further, in the high-speed differential quad cable of the comparative example, the attenuation value (dB / m) of the frequency (GHz) of 0.1 GHz is 5000 times that the initial value is 0.343 (dB / m). After the sliding test, it was 0.405 (dB / m), and the rate of change was 18.1%. Further, the attenuation value (dB / m) of the frequency (GHz) of 1.0 GHz is 1.32 (dB / m) after 5000 sliding tests, although the initial value is 1.32 (dB / m). m), and the rate of change was 31.8%.
On the other hand, in the high-speed differential quad cable 1 of the example, the attenuation amount (dB / m) of the frequency (GHz) of 0.1 GHz is 5000 times that the initial value is 0.375 (dB / m). After the sliding test, it was 0.376 (dB / m), and the rate of change was 0.3%, which is a very good value compared with the high-speed differential quad cable of the comparative example. Further, the attenuation value (dB / m) of the frequency (GHz) of 1.0 GHz was 1.17 (dB / m) as an initial value but 1.28 (dB / m) after 5000 sliding tests. m), and the rate of change is 9.4%, which is also a very good value compared to the high-speed differential quad cable of the comparative example.
As described above, according to the high-speed differential quad cable 1 of the present embodiment, the deterioration of the characteristic impedance and the attenuation amount at the initial stage of sliding of the cable can be suppressed. It is applicable to the camera link cable installed in

　本発明の高速差動用クワッドケーブルは、カメラリンクケーブルのみならず、摺動されると共に高速ビットレートで長距離のデータ伝送を行う機器、例えば、ノート型のコンピュータや折り畳み式の携帯電話等の可動部を有する電子機器に適用可能である。 The high-speed differential quad cable of the present invention is not only a camera link cable, but also a device that slides and transmits data over a long distance at a high bit rate, such as a notebook computer or a foldable mobile phone. The present invention can be applied to an electronic device having a movable part.

Claims (2)

　複数本の導線を撚り合わせた内部導体の外周に誘電体層を設けた信号線を４芯、右方向もしくは左方向に撚り合わせ、前記４芯の信号線の外周にバッファ層を設け、前記バッファ層の外周にテープ状部材を螺旋状に巻き付けた第１の巻回層を設け、前記第１の巻回層の外周に複数本の導線を前記４芯の信号線の撚り方向と同一方向に撚り合わせた外部導体を設け、前記外部導体の外周にテープ状部材を螺旋状に巻き付けた第２の巻回層を設け、前記第２の巻回層の外周に外被を設けたことを特徴とする高速差動用クワッドケーブル。 The signal wire provided with the dielectric layer on the outer periphery of the inner conductor obtained by twisting a plurality of conducting wires is twisted in the 4-core, right direction or left direction, and the buffer layer is provided on the outer periphery of the 4-core signal line, A first winding layer in which a tape-like member is spirally wound around the outer periphery of the layer is provided, and a plurality of conductors are arranged on the outer periphery of the first winding layer in the same direction as the twisting direction of the four-core signal line A twisted outer conductor is provided, a second winding layer in which a tape-like member is spirally wound around the outer periphery of the outer conductor is provided, and a jacket is provided on the outer periphery of the second winding layer. High speed differential quad cable. 　前記４芯の信号線の中心および該信号線と前記バッファ層の間に、高周波特性の良好な部材を介在させたことを特徴とする請求項１に記載の高速差動用クワッドケーブル。 The quad cable for high-speed differential according to claim 1, wherein a member having good high-frequency characteristics is interposed between the center of the four-core signal line and between the signal line and the buffer layer.
PCT/JP2010/072842 2009-12-15 2010-12-14 High-speed differential quad cable Ceased WO2011074693A1 (en)

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