JP2006351424A - Differential signal transmission cable - Google Patents

Differential signal transmission cable Download PDF

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JP2006351424A
JP2006351424A JP2005178004A JP2005178004A JP2006351424A JP 2006351424 A JP2006351424 A JP 2006351424A JP 2005178004 A JP2005178004 A JP 2005178004A JP 2005178004 A JP2005178004 A JP 2005178004A JP 2006351424 A JP2006351424 A JP 2006351424A
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differential signal
signal transmission
transmission cable
wire
wires
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Tatsunari Miyashita
龍成 宮下
Toshiaki Mori
利明 森
Tsunemitsu Omiya
常満 大宮
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SWCC Showa Device Technology Co Ltd
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SWCC Showa Device Technology Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a differential signal transmission cable in which inside skew of the differential signal transmission cable can be lessened, and cable cutting work in terminal working and connecting work of the cable and a connector are easy. <P>SOLUTION: An insulating electric wire 12 and a drain wire 14 are arranged in parallel on the same plane, these outer periphery are equipped with differential signal pair electric wire 18 jacketed by outer covering layer 16 and a coated wire 22 of single core, and at the outer face of these electric wires, and respective plurality of differential signal pair electric wires 18 and coated wires 22 are respectively arranged in parallel on the plane, and heat welding parts 24 to couple respective electric wire neighboring to each other are intermittently installed in the longitudinal direction, and a level difference 26 is installed at the boundary of the heat welding part 24 and non-welding part 28. The outline of the heat welding part 24 becomes clear, and a visual observation of the heat welding part 24 can be ensured easily. Cutting work of respective electric wire for use in connector connection becomes easier by making the existence of the heat welding part 24 as a mark at terminal working. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、コンピュータデバイスの周辺機器、高解像度の画像の伝送や高速ＨＤＤ等の記憶媒体の伝送回路に用いられる差動信号伝送ケーブルに関する。   The present invention relates to a differential signal transmission cable used in peripheral devices of computer devices, transmission of high-resolution images, and transmission circuits of storage media such as high-speed HDDs.

従来から、高速伝送方式として差動信号伝送（ディファレンシャル）方式が注目されている。
この差動信号伝送方式によるコンピュータデバイスの周辺機器、高解像度の画像伝送回路、高速ＨＤＤ等の信号記憶媒体を繋ぐのに好適な伝送回路として差動信号伝送ケーブルがある。中でも５００Ｍｂｐｓ以上の高速伝送に用いられる差動信号伝送ケーブルは伝達信号どうしの僅かな信号の伝播遅延時間差（スキュー）が問題となる。このため、差動信号伝送ケーブルは、信号線となる２本の絶縁電線どうしの伝播遅延時間差を限りなくゼロに近づける必要がある。 Conventionally, a differential signal transmission (differential) system has attracted attention as a high-speed transmission system.
There is a differential signal transmission cable as a transmission circuit suitable for connecting a peripheral device of a computer device by this differential signal transmission system, a high-resolution image transmission circuit, and a signal storage medium such as a high-speed HDD. In particular, a differential signal transmission cable used for high-speed transmission of 500 Mbps or more has a problem of a slight signal propagation delay time difference (skew) between transmission signals. For this reason, in the differential signal transmission cable, it is necessary to make the difference in propagation delay time between the two insulated wires to be signal lines as close to zero as possible.

このような要求に適合した差動信号伝送ケーブルの第１の例として、図５（ａ）に示すケーブルがある。すなわち、中心導体５１の外周に低密度絶縁層５２及びスキン層５３を順次設けた絶縁電線（信号線）５４を２本平行に接して並べ、これらの２本の絶縁電線５４の外周に金属ラミネートテープ等の導電性テープを金属面を外側にして包囲して外部導体５５を設け、この外部導体５５の外側で、２本の絶縁電線５４の中央外側部の一方にドレイン線５６を縦添えし、このドレイン線５６と外部導体５５の外周に合成樹脂テープを巻回して押え巻きテープ層５７を設け、さらにこの外周にジャケット層５８を被覆してなる差動信号伝送ケーブル５９である。   As a first example of a differential signal transmission cable that meets such requirements, there is a cable shown in FIG. That is, two insulated wires (signal lines) 54 in which a low-density insulating layer 52 and a skin layer 53 are sequentially provided on the outer periphery of the center conductor 51 are arranged in contact with each other in parallel, and a metal laminate is formed on the outer periphery of the two insulated wires 54. An outer conductor 55 is provided by enclosing a conductive tape such as a tape with the metal surface facing outward, and a drain wire 56 is vertically attached to one of the central outer portions of the two insulated wires 54 outside the outer conductor 55. This is a differential signal transmission cable 59 in which a synthetic resin tape is wound around the drain wire 56 and the outer conductor 55 to provide a press-wound tape layer 57, and a jacket layer 58 is coated on the outer periphery.

さらに、差動信号伝送ケーブルの第２の例として、図５（ｂ）に示すケーブルがある。すなわち、従来の第１の例と同じ構造の２本の絶縁電線５４の電気的平衡度を重視した、ビットレートの高速化に対応したハイスペック品として、２本の絶縁電線５４を平行に並べ、それらの両側にドレイン線５６を配置し、４芯フラット構造を保ちつつ金属ラミネートテープ等の導電性テープを金属面を内側にして螺旋巻き若しくは縦添えにして外部導体５５を形成し、その外側にジャケット層５８を設けた差動信号伝送ケーブル６０が知られている（例えば、特許文献１参照）。   Furthermore, there is a cable shown in FIG. 5B as a second example of the differential signal transmission cable. In other words, the two insulated wires 54 are arranged in parallel as a high-spec product corresponding to a higher bit rate with an emphasis on the electrical balance of the two insulated wires 54 having the same structure as the conventional first example. The drain wires 56 are arranged on both sides of the outer conductor 55, and a conductive tape such as a metal laminate tape is spirally wound or vertically attached with the metal surface on the inside while maintaining the four-core flat structure, and the outer conductor 55 is formed on the outside. There is known a differential signal transmission cable 60 provided with a jacket layer 58 (see, for example, Patent Document 1).

また、ケーブル素線が複数本、平行に並べられ隣接するケーブル素線の保護被膜どうしが互いに接着または融着されたものであって、かつその融着部分が隣接する一対のケーブル素線どうしの長さ方向に沿って間欠的に設けられ、その各融着部分の位置が隣接する一対毎に相互に順次ずれて配置されて構成された差動型ケーブルが知られている（例えば、特許文献２参照）。   Also, a plurality of cable strands are arranged in parallel, and the protective coatings of adjacent cable strands are bonded or fused together, and a pair of cable strands adjacent to each other are fused. A differential cable is known that is provided intermittently along the length direction, and the positions of the respective fused portions are sequentially shifted from each other in pairs adjacent to each other (for example, Patent Documents). 2).

そして、複数本の絶縁電線を撚り合わせて高速信号伝送ケーブルを製造する際に、各絶縁電線を全て略等しい長さにした状態で撚り合わせて、絶縁電線どうしのスキューを限りなくゼロに近づけることができるように組立て加工される高速信号伝送ケーブルとして、ケーブル素線が複数本、平行に所定のピッチ間隔で平面状に並べられ、これらのケーブル素線の長手方向に対して横断する複数の固定テープを間欠的に配置し、これらの固定テープによってケーブル素線が一体に保持されたケーブルコア中間体を巻回して構成されるケーブルコアを具備する高速信号伝送ケーブルが知られている（例えば、特許文献３参照）。
特開２００１−９３３５７号公報 特表２０００−５１６５７９号公報 特開２００３−３１７５５１号公報 When manufacturing a high-speed signal transmission cable by twisting a plurality of insulated wires, twist each insulated wire in an almost equal length so that the skew between the insulated wires is as close to zero as possible. As a high-speed signal transmission cable that is assembled and processed so that it can be installed, a plurality of cable strands are arranged in parallel in a plane at a predetermined pitch interval, and a plurality of fixed wires traverse the longitudinal direction of these cable strands There is known a high-speed signal transmission cable including a cable core configured by winding a cable core intermediate body in which a tape is intermittently arranged and a cable element wire is integrally held by these fixing tapes (for example, (See Patent Document 3).
JP 2001-93357 A JP 2000-516579 gazette JP 2003-317551 A

ところで、上記の技術には、次のような解決すべき課題があった。
従来から、図５（ａ）、（ｂ）に示した構造の差動信号伝送ケーブルの複数本をそれぞれ同一平面状に並行配列し、これらの差動信号伝送ケーブルの相隣接する各ケーブルどうしを連結する融着部分を設けた簾型の差動信号伝送ケーブルが知られている。
このような簾型の差動信号伝送ケーブルを製造するためには、各ケーブルどうしを連結する融着部分に熱と圧力を加える必要があるが、融着部分に熱と圧力が加わった際に、差動信号伝送ケーブルの２本の絶縁電線（信号線）間のドレイン線により不均一に信号線が変形し、差動インピーダンスのバランスが崩れていた。 By the way, the above technique has the following problems to be solved.
Conventionally, a plurality of differential signal transmission cables having the structure shown in FIGS. 5A and 5B are arranged in parallel on the same plane, and adjacent cables of these differential signal transmission cables are connected to each other. A saddle type differential signal transmission cable provided with a fused portion to be connected is known.
In order to manufacture such a saddle-shaped differential signal transmission cable, it is necessary to apply heat and pressure to the fusion part connecting the cables, but when heat and pressure are applied to the fusion part, The signal line was deformed unevenly by the drain line between the two insulated wires (signal lines) of the differential signal transmission cable, and the balance of the differential impedance was lost.

さらに、差動信号伝送ケーブルの端末加工時にはコネクタのピッチに合わせてケーブルの端末を加工することから、各差動信号対電線の信号長にばらつきが生じ端末加工時に僅かな対内スキューと対間スキューが生じていた。   In addition, when processing differential signal transmission cable ends, the cable ends are processed according to the connector pitch, resulting in variations in the signal length of each differential signal vs. wire, and slight inward and inter-pair skew during end processing. Has occurred.

本発明は、以上の点に着目してなされたもので、差動信号対電線の対内スキューを小さくできると共に、所望の差動インピーダンスを損ねることなく製造でき、端末加工時のケーブル切断作業及びケーブルとコネクタとの接続作業が容易な差動信号伝送ケーブルを提供することを目的とする。   The present invention has been made paying attention to the above points, and can reduce the in-skew of the differential signal-to-wire and can be manufactured without damaging the desired differential impedance. It is an object of the present invention to provide a differential signal transmission cable that can be easily connected to a connector.

本発明の各実施例においては、それぞれ次のような構成により上記の課題を解決する。
〈構成１〉
２本の絶縁電線と少なくとも１本のドレイン線とが同一平面上に並列配置され、その外周に導電テープからなるシールド層が設けられ、さらにその外周に、横断面形状が楕円形の外部被覆層が設けられた差動信号対電線を備え、上記差動信号対電線の複数本を、それぞれ上記楕円形の長軸方向に並列配置すると共に、これらの差動信号対電線に、相隣接する各差動信号対電線の外部被覆層の長軸方向の端部どうしを熱融着して連結した熱融着部を、長手方向に亘って間欠的若しくは連続的に設けたことを特徴とする差動信号伝送ケーブル。 In each embodiment of the present invention, the above-described problems are solved by the following configurations.
<Configuration 1>
Two insulated wires and at least one drain wire are arranged in parallel on the same plane, a shield layer made of conductive tape is provided on the outer periphery, and an outer covering layer having an elliptical cross-sectional shape on the outer periphery The differential signal pair wires are provided with a plurality of the differential signal pair wires arranged in parallel in the major axis direction of the ellipse, and the differential signal pair wires are adjacent to each other. The difference is characterized in that a heat-sealed part is provided intermittently or continuously in the longitudinal direction by joining the ends in the major axis direction of the outer covering layer of the differential signal pair wire to each other by heat-sealing. Dynamic signal transmission cable.

差動信号対電線の外部被覆層の長軸方向の端部を加熱加圧して熱融着するので、差動信号対電線の２本の絶縁電線を加圧することがない。従って、差動信号対電線の外部被覆層の熱融着部の成形により、差動信号対電線内の特性インピーダンスのバランスを損なわせることなく、扁平な簾状フラットケーブルが形成される。
外部被覆層の横断面形状の楕円形は、一例であり、差動伝送路の両脇に熱融着のための余裕を持たせた形状を代表して表現したものである。 Since the end portion in the major axis direction of the outer covering layer of the differential signal pair wire is heated and pressurized and heat-sealed, the two insulated wires of the differential signal pair wire are not pressurized. Therefore, by forming the heat-sealed portion of the outer covering layer of the differential signal-to-wire, a flat hook-shaped flat cable is formed without impairing the balance of characteristic impedance in the differential signal-to-wire.
The oval shape of the cross-sectional shape of the outer coating layer is an example, and represents a shape in which a margin for heat fusion is provided on both sides of the differential transmission path.

〈構成２〉
構成１記載の差動信号伝送ケーブルにおいて、上記差動信号対電線と１本の導体が外部被覆層により被覆された被覆線の各複数本をそれぞれ同一平面上に並列配置し、かつこれらの電線の外面に、相隣接する各電線どうしを連結する熱融着部を長手方向に亘って間欠的若しくは連続的に設けたことを特徴とする差動信号伝送ケーブル。 <Configuration 2>
The differential signal transmission cable according to Configuration 1, wherein the differential signal pair wires and a plurality of covered wires each having one conductor covered with an outer covering layer are arranged in parallel on the same plane, and these wires A differential signal transmission cable characterized in that a heat-sealing part for connecting adjacent electric wires to each other is provided intermittently or continuously in the longitudinal direction on the outer surface of the cable.

差動信号対電線の高さ（楕円形の短軸方向の長さ）と、１本の導体を絶縁被覆してなる、１芯の被覆線の外径との差が殆どないフラットケーブルが形成される。   A flat cable with little difference between the height of the differential signal pair wire (the length of the ellipse in the minor axis direction) and the outer diameter of the single-core coated wire formed by insulating one conductor is formed. Is done.

〈構成３〉
構成１または２に記載の差動信号伝送ケーブルにおいて、上記熱融着部と熱融着していない部分との境界に段差を設けたことを特徴とする差動信号伝送ケーブル。 <Configuration 3>
3. The differential signal transmission cable according to Configuration 1 or 2, wherein a step is provided at a boundary between the heat fusion part and a non-heat fusion part.

熱融着部と熱融着していない部分との境界に段差を設けたことにより、熱融着部の輪郭が明確になり、容易に熱融着部を目視確認することができる。従って、差動信号伝送ケーブルの端末加工時に、熱融着部の所在を目印としてコネクタ接続のための各電線の切断作業をし易くする効果がある。   By providing a step at the boundary between the heat fusion part and the non-heat fusion part, the outline of the heat fusion part becomes clear and the heat fusion part can be easily visually confirmed. Therefore, there is an effect of facilitating the cutting operation of each electric wire for connector connection with the location of the heat-sealed portion as a mark when processing the terminal of the differential signal transmission cable.

〈構成４〉
構成１〜３のいずれかに記載の差動信号伝送ケーブルにおいて、上記差動信号対電線の外部被覆層の長軸方向の端部を、上記外部被覆層の肉厚に０．２〜２．０ｍｍを加えた長さとしたことを特徴とする差動信号伝送ケーブル。 <Configuration 4>
In the differential signal transmission cable according to any one of the configurations 1 to 3, the end portion in the major axis direction of the outer covering layer of the differential signal pair electric wire is set to a thickness of 0.2 to 2. A differential signal transmission cable characterized by having a length with 0 mm added.

無駄のない適度の長さの熱融着部が得られる。   A heat-sealed portion having an appropriate length without waste is obtained.

〈構成５〉
構成１〜４のいずれかに記載の差動信号伝送ケーブルにおいて、上記ドレイン線の２本を、上記２本の絶縁電線の両側にそれぞれ並列配置したことを特徴とする差動信号伝送ケーブル。 <Configuration 5>
5. The differential signal transmission cable according to any one of configurations 1 to 4, wherein two of the drain wires are arranged in parallel on both sides of the two insulated wires.

差動信号対電線の扁平形状が安定する。   The flat shape of the differential signal pair wire is stable.

〈構成６〉
構成２〜５のいずれかに記載の差動信号伝送ケーブルにおいて、上記差動信号対電線の外部被覆層と上記被覆線の絶縁被覆とを同じ耐熱性樹脂で形成したことを特徴とする差動信号伝送ケーブル。 <Configuration 6>
The differential signal transmission cable according to any one of configurations 2 to 5, wherein an outer coating layer of the differential signal pair wire and an insulating coating of the coated wire are formed of the same heat resistant resin. Signal transmission cable.

差動信号伝送ケーブルの端末加工時に、差動信号対電線内に熱的悪影響を及ぼすことなくモールド加工が行える。   When processing the terminal of the differential signal transmission cable, molding can be performed without adversely affecting the differential signal-to-wire.

〈構成７〉
構成２〜６のいずれかに記載の差動信号伝送ケーブルにおいて、上記被覆線は、制御用電線と電源用電線とダミー線とを含むものであることを特徴とする差動信号伝送ケーブル。 <Configuration 7>
The differential signal transmission cable according to any one of configurations 2 to 6, wherein the covered wire includes a control wire, a power supply wire, and a dummy wire.

ダミー線を使用することにより、差動信号伝送ケーブルの端末加工時に使用するコネクタの形状、構造等の仕様に容易に合わせることができる。   By using the dummy wire, it is possible to easily match the specifications of the shape and structure of the connector used when processing the terminal of the differential signal transmission cable.

以下、本発明の実施の形態を実施例毎に詳細に説明する。   Hereinafter, embodiments of the present invention will be described in detail for each example.

図１は実施例１の差動信号伝送ケーブルを示す図で、（ａ）は平面図、（ｂ）は（ａ）のＡＡ線に沿う拡大断面図、（ｃ）は（ａ）のＢＢ線に沿う拡大断面図である。
実施例１の差動信号伝送ケーブルは、図１（ａ）に示すように、複数本の差動信号対電線１８と複数本の被覆線２２とをそれぞれ同一平面上に並列配置し、かつこれらの電線１８、２２の各外面に、相隣接する各電線どうしを連結する熱融着部２４を長手方向に亘って間欠的に設けて簾状フラットケーブルとしたもので、熱融着部２４と熱融着していない部分２８との境界に段差２６が設けられている。 1A and 1B are diagrams illustrating a differential signal transmission cable according to a first embodiment, where FIG. 1A is a plan view, FIG. 1B is an enlarged cross-sectional view taken along the line AA in FIG. 1A, and FIG. FIG.
In the differential signal transmission cable of the first embodiment, as shown in FIG. 1A, a plurality of differential signal pair wires 18 and a plurality of covered wires 22 are arranged in parallel on the same plane, and these Are provided on the outer surfaces of the electric wires 18 and 22 intermittently in the longitudinal direction to connect the adjacent electric wires to each other in the longitudinal direction. A step 26 is provided at the boundary with the portion 28 that is not heat-sealed.

図２は差動信号対電線１８の横断面図を示している。
差動信号対電線１８は、図２に示すように、２本の絶縁電線１２とその両側に２本のドレイン線１４とがそれぞれ同一平面上に並列配置され、これらの絶縁電線１２とドレイン線１４の外周に、アルミニウムテープとポリエステルテープを貼り合わせてなるラミネートテープ１５を、アルミニウム面を内側にして包囲し、これらの外周が耐熱ポリ塩化ビニル樹脂等の耐熱性樹脂からなる外部被覆層１６により被覆されている。 FIG. 2 shows a cross-sectional view of the differential signal pair wire 18.
As shown in FIG. 2, the differential signal pair electric wire 18 includes two insulated wires 12 and two drain wires 14 arranged on the same plane in parallel on the both sides, and these insulated wires 12 and the drain wires. A laminate tape 15 formed by laminating an aluminum tape and a polyester tape on the outer periphery of 14 is surrounded with an aluminum surface inside, and the outer periphery thereof is covered by an outer covering layer 16 made of a heat resistant resin such as a heat resistant polyvinyl chloride resin. It is covered.

差動信号対電線１８の外部被覆層１６の横断面形状は、楕円形である。この楕円形とは、いわゆる正楕円形より、図３に示すようなもっと扁平な形状を含むものである。複数本の差動信号対電線１８が楕円形の長軸方向に並列配置されている。差動信号対電線１８の外部被覆層１６の横断面形状が楕円形であることから、全体として扁平であり、その扁平高さと１芯の被覆線２２の外径との差が小さい簾状フラットケーブルが形成されている。ドレイン線１４の２本が２本の被覆線２２の両側にそれぞれ並列配置されていることにより、差動信号対電線１８の扁平形状が安定している。   The cross-sectional shape of the outer covering layer 16 of the differential signal pair electric wire 18 is an ellipse. This elliptical shape includes a flatter shape as shown in FIG. 3 than a so-called regular elliptical shape. A plurality of differential signal pair electric wires 18 are arranged in parallel in the elliptical long axis direction. Since the cross-sectional shape of the outer covering layer 16 of the differential signal pair electric wire 18 is elliptical, it is flat as a whole, and a bowl-shaped flat with a small difference between the flat height and the outer diameter of the single-core covered wire 22 A cable is formed. Since the two drain wires 14 are arranged in parallel on both sides of the two covered wires 22, the flat shape of the differential signal pair wire 18 is stable.

被覆線２２は、図１（ｂ）に示すように、１本の導体２０の外周が外部被覆層２１により被覆されてなる１芯の電線で、制御用電線３２と電源用電線３４を含んでいる。制御用電線３２は電源用電線３４と比べると導体外径が小さい。また、被覆線２２は、差動信号伝送ケーブルの端末加工時に使用するコネクタの形状、構造等の仕様に応じてダミー線を含むこともある。例えば、差動信号伝送ケーブルは、差動信号対電線１８が４本、制御用電線３２が７本、電源用電線３４が５本、ダミー線が２本で構成される。   As shown in FIG. 1B, the covered wire 22 is a one-core electric wire in which the outer periphery of one conductor 20 is covered with an outer covering layer 21, and includes a control wire 32 and a power supply wire 34. Yes. The control wire 32 has a smaller conductor outer diameter than the power supply wire 34. Further, the covered wire 22 may include a dummy wire depending on specifications such as the shape and structure of the connector used when processing the terminal of the differential signal transmission cable. For example, the differential signal transmission cable includes four differential signal pairs 18, seven control wires 32, five power wires 34, and two dummy wires.

熱融着部２４は、差動信号対電線１８と被覆線２２の各外部被覆層の一部が熱溶融されると共に加圧されて互いに融着されたもので、所定の金型を使用して加熱加圧する手段や、誘導加熱、誘電加熱等を利用した周知の熱融着手段を使って形成される。   The heat fusion part 24 is a part in which each of the outer covering layers of the differential signal pair electric wire 18 and the covered wire 22 is heat-melted and pressed to be fused to each other, and a predetermined mold is used. It is formed by using a means for heating and pressurizing, or a known heat fusion means using induction heating, dielectric heating or the like.

段差２６は、ほんの僅かの高さでも熱融着部２４の輪郭を目視できる程度であればよい。熱融着していない部分２８は、複数本の差動信号対電線１８と被覆線２２が互いに接着されていない、ばらばらの状態となっている。熱融着部２４と熱融着していない部分２８との境界に段差２６を設けたことにより、熱融着部２４の輪郭が明確になり、容易に熱融着部２４を目視確認することができる。従って、差動信号伝送ケーブルの端末加工時に、熱融着部２４の所在を目印としてコネクタ接続のための各電線の切断作業をし易くする効果がある。   The step 26 may be of such a level that the outline of the heat-sealed portion 24 can be visually observed even at a slight height. The portion 28 that is not heat-sealed is in a disjointed state in which the plurality of differential signal pair wires 18 and the covered wires 22 are not bonded to each other. By providing the step 26 at the boundary between the heat fusion part 24 and the non-heat fusion part 28, the outline of the heat fusion part 24 becomes clear and the heat fusion part 24 can be easily visually confirmed. Can do. Therefore, there is an effect of facilitating the cutting operation of each electric wire for connector connection, using the location of the heat-sealing portion 24 as a mark when processing the terminal of the differential signal transmission cable.

図３は差動信号対電線１８の熱融着部２４の成形状況の説明図で、（ａ）は熱融着前、（ｂ）は熱融着後の状況をそれぞれ示している。
図３（ａ）に示すように、差動信号対電線１８の外部被覆層１６の端部３０の長さＬを、外部被覆層１５の肉厚に０．２〜２．０ｍｍを加えた長さとされ、これが熱変形部とされる。各差動信号対電線１８を固定した状態で、各熱変形部を加熱加圧することにより、図３（ｂ）に示すように、端部３０が熱変形して互いに融着し合い所定形状の熱融着部２４が形成される。 FIG. 3 is an explanatory view of the molding state of the heat fusion part 24 of the differential signal pair electric wire 18, (a) shows the state before the heat fusion, and (b) shows the state after the heat fusion.
As shown in FIG. 3A, the length L of the end portion 30 of the outer covering layer 16 of the differential signal pair electric wire 18 is the length obtained by adding 0.2 to 2.0 mm to the thickness of the outer covering layer 15. This is the thermal deformation part. With each differential signal pair wire 18 fixed, by heating and pressurizing each thermally deformable portion, the end portions 30 are thermally deformed and fused together as shown in FIG. A heat fusion part 24 is formed.

上記の熱融着手段は、差動信号対電線１８の２本の絶縁電線１２を両側から加圧することなく熱融着部２４を形成するので、熱融着部２４の成形により、差動信号対電線１８内の特性インピーダンスのバランスを損なわせることはない。   The above heat fusion means forms the heat fusion part 24 without pressing the two insulated wires 12 of the differential signal pair electric wire 18 from both sides. The balance of the characteristic impedance in the electric wire 18 is not impaired.

実施例１の差動信号伝送ケーブルは、差動信号対電線１８と被覆線２２の各複数本をそれぞれ同一平面上に並列配置し、熱融着部２４により相隣接する各電線どうしを連結することによって、簾状フラットケーブルとしたもので、幅方向にも曲げ易く束ねることができ、配線方法の自由度が向上している。また、小型化したコネクタへの負担も少なく接続の信頼性も向上している。また、差動信号対電線１８の対間スキューを小さくできる。   In the differential signal transmission cable according to the first embodiment, a plurality of differential signal pair wires 18 and covered wires 22 are arranged in parallel on the same plane, and the adjacent wires are connected to each other by the heat fusion part 24. Thus, it is a saddle-shaped flat cable, and can be easily bundled in the width direction, so that the degree of freedom of the wiring method is improved. In addition, the burden on the miniaturized connector is small, and the connection reliability is improved. Moreover, the pair-to-pair skew of the differential signal pair electric wire 18 can be reduced.

差動信号対電線１８の外部被覆層１６と被覆線２２の外部被覆層２１とを同じ耐熱性樹脂で形成することにより、差動信号伝送ケーブルの端末加工時にモールド加工が行える。耐熱性樹脂としては、例えば、耐熱ポリ塩化ビニル樹脂が使用される。   By forming the outer covering layer 16 of the differential signal pair electric wire 18 and the outer covering layer 21 of the covering wire 22 with the same heat-resistant resin, molding can be performed at the end processing of the differential signal transmission cable. As the heat resistant resin, for example, a heat resistant polyvinyl chloride resin is used.

図４は、実施例２の差動信号伝送ケーブルを示す平面図である。
実施例２の差動信号伝送ケーブルは、図４に示すように、複数本の差動信号対電線１８と複数本の制御用電線（被覆線）３２と複数本の差動信号対電線１８とを順次同一平面上に並列配置し、かつこれらの電線１８、２２の各外面に、相隣接する各電線どうしを連結する熱融着部２４を長手方向に亘って間欠的に設けて簾状フラットケーブルとしたもので、熱融着部２４と熱融着していない部分２８との境界に段差２６が設けられている。
このように機器のコネクタ等に合わせて差動信号対電線１８と被覆線２２の配列を適宜選択できる。 FIG. 4 is a plan view illustrating the differential signal transmission cable according to the second embodiment.
As shown in FIG. 4, the differential signal transmission cable of the second embodiment includes a plurality of differential signal pair wires 18, a plurality of control wires (covered wires) 32, and a plurality of differential signal pair wires 18. Are sequentially arranged in parallel on the same plane, and on the outer surfaces of these electric wires 18 and 22, heat-sealing portions 24 for connecting adjacent electric wires are intermittently provided in the longitudinal direction to form a bowl-shaped flat A cable is provided, and a step 26 is provided at the boundary between the heat-sealed portion 24 and the portion 28 not heat-sealed.
Thus, the arrangement of the differential signal pair electric wire 18 and the covered wire 22 can be appropriately selected according to the connector of the device.

なお、本発明においては、熱融着部２４を、同一平面上に並列配置された複数本の差動信号対電線１８と被覆線２２との各外面に、長手方向に亘って連続的に設けたものを含むものである。また、本発明の差動信号伝送ケーブルは、複数本の差動信号対電線１８のみを、それぞれ楕円形の長軸方向に並列配置すると共に、これらの差動信号対電線１８に、相隣接する各差動信号対電線の外部被覆層１６の長軸方向の端部３０どうしを熱融着して連結した熱融着部を、長手方向に亘って間欠的若しくは連続的に設けてフラットケーブルとしたものを含むものである。   In the present invention, the heat fusion part 24 is continuously provided in the longitudinal direction on each outer surface of the plurality of differential signal pair wires 18 and the covered wire 22 arranged in parallel on the same plane. It includes things. In the differential signal transmission cable of the present invention, only a plurality of differential signal pairs 18 are arranged in parallel in the major axis direction of the ellipse, and adjacent to these differential signal pairs 18. A flat cable is formed by intermittently or continuously providing a heat-sealing portion in which the end portions 30 in the major axis direction of the outer covering layer 16 of each differential signal pair wire are joined by heat fusion in the longitudinal direction. Is included.

実施例１の差動信号伝送ケーブルを示す図で、（ａ）は平面図、（ｂ）は（ａ）のＡＡ線に沿う拡大断面図、（ｃ）は（ａ）のＢＢ線に沿う拡大断面図である。BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the differential signal transmission cable of Example 1, (a) is a top view, (b) is an expanded sectional view which follows the AA line of (a), (c) is an expansion along the BB line of (a). It is sectional drawing. 差動信号対電線を示す横断面図である。It is a cross-sectional view which shows a differential signal pair electric wire. 差動信号対電線の熱融着方法を説明するための説明図である。It is explanatory drawing for demonstrating the heat sealing | fusion method of a differential signal pair electric wire. 実施例２の差動信号伝送ケーブルを示す平面図である。6 is a plan view showing a differential signal transmission cable of Example 2. FIG. 従来の差動信号対電線を示す図で、（ａ）は一例を示す横断面図、（ｂ）は他の例を示す横断面図である。It is a figure which shows the conventional differential signal pair electric wire, (a) is a cross-sectional view which shows an example, (b) is a cross-sectional view which shows another example.

符号の説明Explanation of symbols

１２ 絶縁電線
１４ ドレイン線
１６ 外部被覆層
１８ 差動信号対電線
２０ 導体
２２ 被覆線
２４ 熱融着部
２６ 段差
２８ 熱融着していない部分
３０ 端部
３２ 制御用電線
３４ 電源用電線 12 Insulated wire 14 Drain wire 16 Outer covering layer 18 Differential signal pair wire 20 Conductor 22 Covered wire 24 Heat-sealed portion 26 Step 28 Unheated portion 30 End 32 Control wire 34 Power wire

Claims (7)

２本の絶縁電線と少なくとも１本のドレイン線とが同一平面上に並列配置され、その外周に導電テープからなるシールド層が設けられ、さらにその外周に、横断面形状が楕円形の外部被覆層が設けられた差動信号対電線を備え、
前記差動信号対電線の複数本を、それぞれ前記楕円形の長軸方向に並列配置すると共に、これらの差動信号対電線に、相隣接する各差動信号対電線の外部被覆層の長軸方向の端部どうしを熱融着して連結した熱融着部を、長手方向に亘って間欠的若しくは連続的に設けたことを特徴とする差動信号伝送ケーブル。 Two insulated wires and at least one drain wire are arranged in parallel on the same plane, a shield layer made of conductive tape is provided on the outer periphery, and an outer covering layer having an elliptical cross-sectional shape on the outer periphery A differential signal-to-wire provided with
A plurality of the differential signal pair wires are arranged in parallel in the elliptical long axis direction, and the long axis of the outer covering layer of each differential signal pair wire adjacent to the differential signal pair wires A differential signal transmission cable characterized in that a heat-sealed portion in which end portions in a direction are connected by heat-sealing is provided intermittently or continuously over a longitudinal direction. 請求項１記載の差動信号伝送ケーブルにおいて、
前記差動信号対電線と１本の導体が外部被覆層により被覆された被覆線の各複数本をそれぞれ同一平面上に並列配置し、かつこれらの電線の外面に、相隣接する各電線どうしを連結する熱融着部を長手方向に亘って間欠的若しくは連続的に設けたことを特徴とする差動信号伝送ケーブル。 The differential signal transmission cable according to claim 1,
A plurality of covered wires in which the differential signal pair wires and one conductor are covered with an outer covering layer are arranged in parallel on the same plane, and adjacent wires are arranged on the outer surface of these wires. A differential signal transmission cable characterized in that a heat-sealing part to be connected is provided intermittently or continuously over the longitudinal direction. 請求項１または２に記載の差動信号伝送ケーブルにおいて、
前記熱融着部と熱融着していない部分との境界に段差を設けたことを特徴とする差動信号伝送ケーブル。 The differential signal transmission cable according to claim 1 or 2,
A differential signal transmission cable, wherein a step is provided at a boundary between the heat fusion part and a non-heat fusion part. 請求項１〜３のいずれかに記載の差動信号伝送ケーブルにおいて、
前記差動信号対電線の外部被覆層の長軸方向の端部を、前記外部被覆層の肉厚に０．２〜２．０ｍｍを加えた長さとしたことを特徴とする差動信号伝送ケーブル。 In the differential signal transmission cable according to any one of claims 1 to 3,
A differential signal transmission cable characterized in that an end portion in the major axis direction of the outer covering layer of the differential signal pair electric wire has a length obtained by adding 0.2 to 2.0 mm to the thickness of the outer covering layer. . 請求項１〜４のいずれかに記載の差動信号伝送ケーブルにおいて、
前記ドレイン線の２本を、前記２本の絶縁電線の両側にそれぞれ並列配置したことを特徴とする差動信号伝送ケーブル。 In the differential signal transmission cable according to any one of claims 1 to 4,
A differential signal transmission cable, wherein two of the drain wires are arranged in parallel on both sides of the two insulated wires. 請求項２〜５のいずれかに記載の差動信号伝送ケーブルにおいて、
前記差動信号対電線の外部被覆層と前記被覆線の絶縁被覆とを同じ耐熱性樹脂で形成したことを特徴とする差動信号伝送ケーブル。 In the differential signal transmission cable according to any one of claims 2 to 5,
The differential signal transmission cable, wherein an outer coating layer of the differential signal pair wire and an insulating coating of the coated wire are formed of the same heat resistant resin. 請求項２〜６のいずれかに記載の差動信号伝送ケーブルにおいて、
前記被覆線は、制御用電線と電源用電線とダミー線とを含むものであることを特徴とする差動信号伝送ケーブル。 In the differential signal transmission cable according to any one of claims 2 to 6,
The sheathed wire includes a control wire, a power wire, and a dummy wire.
JP2005178004A 2005-06-17 2005-06-17 Differential signal transmission cable Pending JP2006351424A (en)

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