JP2004071374A - Connecting method of transmission cable and connector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain reduced crosstalk, uniform characteristic impedance, and common ground connection, by having an equal distance between a drain wire and each signal wire so that the electric field generated by the both signal wires becomes almost symmetrical, and near-end crosstalk from the both signal wires is uniform. <P>SOLUTION: When connecting a transmission cable 1 having a pair of signal wires 3 and a drain wire 7, to a connector 15, the pair of signal wires 3 are split and connected to the upper surface and the lower surface of a signal contact 19 respectively, and the drain wire 7 is connected to approximately center in a vertical direction of a ground contact 23. This allows the distance of the drain wire and each signal wire to be equal, the electric field generated by the both signal wires to be approximately symmetrical, and the crosstalk from the both signal wires to be uniform, thus, reducing the near-end crosstalk, and having uniform characteristic impedance of each signal wire at connector connecting part. <P>COPYRIGHT: (C)2004,JPO

Description

表１から、＃１→＃２の場合と＃３→＃２の場合とを比較すると、この実施の形態のコネクタ接続方法は従来の方法より近端クロストーク値の差が少ないことが分かる。また、近端クロストーク値の合計（％）についても、この実施の形態の方法は従来の方法より小さいことが分かる。
【００３０】
次に、この発明の他の実施の形態のコネクタ１５について幾つかの例を説明する。なお、これらの例は図１のコネクタ１５とほぼ同様の構造であるので同様の部材は同符号を付し、異なる点について説明する。
【００３１】
図２には図１に代る他の実施の形態が示されている。図２において、図１における部品と同じ部品には同一の符号を付して重複する説明を省略する。
【００３２】
図２においてグランド接続部２１として左右方向にあけられた貫通穴に右側からドレイン線７が挿入されて例えば半田付けで接続される。
【００３３】
したがって、図２の場合の作用並びに効果は図１と同様の作用並びに効果を奏するものである。
【００３４】
図３を参照するに、グランドコンタクト２３のグランド接続部２１としては、ドレイン線７を差し込み可能なドレイン線差し込み用孔としての例えばドレイン線圧入用孔２５がグランドコンタクト２３の前方端面に上下方向のほぼ中央に設けられている。したがって、ドレイン線７は前記ドレイン線圧入用孔２５に差し込んで圧入して容易に接続することができる。
【００３５】
図４には図３に代る他の実施の形態が示されている。図４において、図３における部品と同じ部品には同一の符号を付して重複する説明を省略する。
【００３６】
図４においてグランド接続部２１としてのドレイン線圧入用孔２５が、グランドコンタクト２３の前方上下面にほぼ前部に設けられて、ドレイン線７が上から上下方向のほぼ中央部に差し込んで圧入して容易に接続される。
【００３７】
したがって、図４の場合の作用並びに効果は図３と同様の作用並びに効果を奏するものである。
【００３８】
図５には図３に代る他の実施の形態が示されている。図５において、図３における部品と同じ部品には同一の符号を付して重複する説明を省略する。
【００３９】
図５においてグランド接続部２１としてのドレイン線圧入用孔２５が、グランドコンタクト２３の前方において下方向へ向けて設けられて、ドレイン線７が前方から後方へのほぼ中央部に差し込んで圧入して容易に接続される。
【００４０】
したがって、図５の場合の作用並びに効果は図３と同様の作用並びに効果を奏するものである。
【００４１】
図６には図３に代る他の実施の形態が示されている。図６において、図３における部品と同じ部品には同一の符号を付して重複する説明を省略する。
【００４２】
図６においてグランド接続部２１としてのドレイン線圧入用孔２５が、グランドコンタクト２３の前方上下面に上方から下方へ向けて割られて設けられて、ドレイン線７が上から上下方向のほぼ中央部に差し込んで圧入して容易に接続される。
【００４３】
したがって、図６の場合の作用並びに効果は図３と同様の作用並びに効果を奏するものである。
【００４４】
図７を参照するに、他の実施の形態のコネクタ１５を示すものであり、グランドコンタクト２３のグランド接続部２１としては、ドレイン線７を差し込み可能なドレイン線差し込み用孔としての例えばドレイン線挿入用孔２７がグランドコンタクト２３の側面の上下方向のほぼ中央に設けられており、孔の向きはグランドコンタクト２３の前方端側に向いている。なお、このドレイン線挿入用孔２７は、例えば雄雌型のプレス用工具が用いられ、図８に示されているように打ち抜き加工によりグランドコンタクト２３にドレイン線挿入用孔２７が形成される。
【００４５】
したがって、ドレイン線７は前記ドレイン線挿入用孔２７に差し込んで容易に接続することができる。
【００４６】
図９を参照するに、図７の変形型のコネクタ１５を示すものであり、ドレイン線挿入用孔２７は図７とは異なり、孔の向きがグランドコンタクト２３の側面に上下方向に向いている。なお、作用効果は図７とほぼ同様である。
【００４７】
図１０を参照するに、他の実施の形態のコネクタ１５を示すものであり、グランドコンタクト２３のグランド接続部２１としては、ドレイン線７を挿入してクランプするドレイン線固定用クランプ２９がグランドコンタクト２３の上下方向のほぼ中央に設けられている。ドレイン線固定用クランプ２９は断面Ｃ字形状をなしており、クランプ穴の向きがグランドコンタクト２３の前方端側に向いている。
【００４８】
したがって、ドレイン線７は前記ドレイン線固定用クランプ２９のクランプ穴に差し込んで、例えばペンチなどの締付け用工具を用いてクランプして容易に接続することができる。
【００４９】
図１１を参照するに、図１０の変形型のコネクタ１５を示すものであり、ドレイン線固定用クランプ２９は図１０とは異なり、クランプ穴の向きがグランドコンタクト２３の側面に上下方向に向いている。なお、作用および効果は図１０とほぼ同様である。
【００５０】
図１２を参照するに、図１０の変形型のコネクタ１５を示すものであり、ドレイン線固定クランプ２９は図１０とは異なり、グランドコンタクト２３を製造する際に一体的に右側面を開口した丸溝が形成される。この丸溝にドレイン線７を前方から差し込みかしめることで接合される。なお、作用および効果は図１０と同様である。
【００５１】
図１４を参照するに、この実施の形態に係わる２芯同軸ケーブル３１は、２本のドレイン線３３Ａ，３３Ｂが設けられており、他は図５に示される２芯同軸ケーブル１とほぼ同様であるので同様の部材は同符号が付されている。なお、この実施の形態では上記の２本のドレイン線３３Ａ，３３Ｂが２本の信号線３の両外側に位置して設けられている。
【００５２】
また、上記の２芯同軸ケーブル３１が接続されるこの実施の形態のコネクタ３５としては、２本の信号線３を上下に振り分けて接続するための接続部３７Ａ，３７Ｂを上下面に設けたシグナルコンタクト３９と、このシグナルコンタクト３９の図１４において左側に位置すると共に上記の２本のドレイン線３３Ａ，３３Ｂのうちの一方のドレイン線３３Ａを上面に接続する第１接続部４１を設けた第１グランドコンタクト４３と、前記シグナルコンタクト３９の図１１において右側に位置すると共に他方のドレイン線３３Ｂを下面に接続する第２接続部４５を設けた第２グランドコンタクト４７と、で構成されている。なお、第２グランドコンタクト４７の上面には他の２芯同軸ケーブル４９の２本のドレイン線５１Ａ，５１Ｂのうちの一方のドレイン線５１Ａを接続するための第１接続部５３が設けられている。
【００５３】
上記のコネクタ３５への接続方法としては、２芯同軸ケーブル３１の２本の信号線３がそれぞれ１本ずつシグナルコンタクト３９の上下面に振り分けて例えば半田付けで接続され、２本のドレイン線３３Ａ，３３Ｂは一方のドレイン線３３Ａが第１グランドコンタクト４３の上面の第１接続部４１に例えば半田付けで接続され、他方のドレイン線３３Ｂが第２グランドコンタクト４７の下面の第２接続部４５に例えば半田付けで接続される。
【００５４】
なお、他の２芯同軸ケーブル４９が隣のシグナルコンタクト５５に接続されるときは、２芯同軸ケーブル４９の一方のドレイン線５１Ａが第２グランドコンタクト４７の上面の第１接続部５３に例えば半田付けで接続され、他方のドレイン線５１Ｂが第３グランドコンタクト５７の下面の第２接続部５９に例えば半田付けで接続される。
【００５５】
したがって、複数の２芯同軸ケーブル３１がコネクタ３５に接続される場合も上記と同様の要領であり、複数の各２芯同軸ケーブル３１の各２本のドレイン線３３Ａ，３３Ｂは、それぞれ対応するシグナルコンタクト３９の両隣のグランドコンタクト４３，４７の第１接続部４１と第２接続部４５に交互に接続されることとなる。
【００５６】
以上のことから、上記のように複数の２芯同軸ケーブル３１の各２本のドレイン線３３Ａ，３３Ｂが両隣のグランドコンタクト４３，４７の上下面の第１接続部４１と第２接続部４５に交互に接続されるので、コモングランド接続が容易にでき、２芯同軸ケーブル３１の２本の信号線３とグランドとの間の電流の流れが均一になり、近端クロストークが軽減し、コネクタ接続部における各信号線の特性インピーダンスを均一にすることが可能となる。
【００５７】
また、コネクタ３５の内部でコモングランドにする必要がなく、余計なグランドの引き回しが不要になるのでコネクタ形状を簡略化することが可能であり、安定した伝送特性を得ることができる。
【００５８】
なお、この発明は前述した実施の形態に限定されることなく、適宜な変更を行うことによりその他の態様で実施し得るものである。
【００５９】
【発明の効果】
以上のごとき発明の実施の形態の説明から理解されるように、請求項１の発明によれば、ドレイン線をグランドコンタクトの上下方向のほぼ中央に接続したので、ドレイン線と各信号線との距離が等しくなり、両信号線が生じる電界がほぼ対称となり、両信号線からのクロストークが均一となり、また、その結果として、近端クロストークが軽減され、コネクタ接続部における各信号線の特性インピーダンスを均一にすることができる。
【００６０】
請求項２の発明によれば、２本のドレイン線を両隣のグランドコンタクトの上下面に交互に接続するので、コモングランド接続を容易にでき、２芯同軸ケーブルの２本の信号線とグランドとの間の電流の流れを均一にできる。近端クロストークを軽減でき、コネクタ接続部における各信号線の特性インピーダンスを均一にすることができる。
【００６１】
また、コネクタ内部でコモングランドにする必要がなく、余計なグランドの引き回しが不要になるのでコネクタ形状を簡略化でき、安定した伝送特性を得ることができる。
【００６２】
請求項３の発明によれば、請求項１記載の効果と同様であり、ドレイン線をグランドコンタクトの上下方向のほぼ中央に接続したので、ドレイン線と各信号線との距離が等しくなり、両信号線が生じる電界がほぼ対称となり、両信号線からのクロストークが均一となり、また、その結果として、近端クロストークが軽減され、コネクタ接続部における各信号線の特性インピーダンスを均一にすることができる。
【００６３】
請求項４の発明によれば、ドレイン線差し込み用孔にドレイン線を容易に差し込んで接続できる。
【００６４】
請求項５の発明によれば、ドレイン線固定用クランプのクランプ穴にドレイン線を容易に差し込んで、例えば締付け用工具で容易にクランプ接続できる。
【００６５】
請求項６の発明によれば、請求項２記載の効果と同様であり、２本のドレイン線を両隣のグランドコンタクトの上下面に交互に接続するので、コモングランド接続を容易にでき、２芯同軸ケーブルの２本の信号線とグランドとの間の電流の流れを均一にできる。近端クロストークを軽減でき、コネクタ接続部における各信号線の特性インピーダンスを均一にすることができる。
【００６６】
また、コネクタ内部でコモングランドにする必要がなく、余計なグランドの引き回しが不要になるのでコネクタ形状を簡略化でき、安定した伝送特性を得ることができる。
【図面の簡単な説明】
【図１】この発明の実施の形態における２芯同軸ケーブルのコネクタ接続状態を示す斜視図である。
【図２】この発明の図１に代る他の実施の形態における２芯同軸ケーブルのコネクタ接続状態を示す斜視図である。
【図３】この発明の他の実施の形態における２芯同軸ケーブルのコネクタ接続状態を示す斜視図である。
【図４】この発明の他の実施の形態における２芯同軸ケーブルのコネクタ接続状態を示す斜視図である。
【図５】この発明の他の実施の形態における２芯同軸ケーブルのコネクタ接続状態を示す斜視図である。
【図６】この発明の別の実施の形態における２芯同軸ケーブルのコネクタ接続状態を示す斜視図である。
【図７】この発明の他の実施の形態における２芯同軸ケーブルのコネクタ接続状態を示す斜視図である。
【図８】図７のグランドコンタクトの前方端側から視たグランド接続部の側面図である。
【図９】この発明の他の実施の形態における２芯同軸ケーブルのコネクタ接続状態を示す斜視図である。
【図１０】この発明の他の実施の形態における２芯同軸ケーブルのコネクタ接続状態を示す斜視図である。
【図１１】この発明の他の実施の形態における２芯同軸ケーブルのコネクタ接続状態を示す斜視図である。
【図１２】この発明の他の実施の形態における２芯同軸ケーブルのコネクタ接続状態を示す斜視図である。
【図１３】（Ａ）は２芯同軸ケーブルの斜視図で、（Ｂ）は（Ａ）の縦断面図である。
【図１４】この発明の他の実施の形態における２芯同軸ケーブルのコネクタ接続状態を示す斜視図である。
【図１５】従来の２芯同軸ケーブルのコネクタ接続状態を示す斜視図である。
【符号の説明】
１，３１，４９　２芯同軸ケーブル
３　信号線
７，３３Ａ，３３Ｂ，５１Ａ，５１Ｂ　ドレイン線
１５，３５　コネクタ
１７Ａ，１７Ｂ　接続部（シグナルコンタクト１９の）
１９，３９，５５　シグナルコンタクト
２１　グランド接続部
２３　グランドコンタクト
２５　ドレイン線圧入用孔
２７　ドレイン線挿入用孔
２９　ドレイン線固定用クランプ
３７Ａ，３７Ｂ　接続部（シグナルコンタクト３９の）
４１　第１接続部（２芯同軸ケーブル３１用の）
４３　第１グランドコンタクト
４５　第２接続部（２芯同軸ケーブル３１用の）
４７　第２グランドコンタクト
５３　第１接続部（２芯同軸ケーブル４９用の）
５７　第３グランドコンタクト
５９　第２接続部（２芯同軸ケーブル４９用の）[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a transmission cable connection method and a connector.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there is a collective cable used between servers such as computers, and is used when reception and transmission are performed instantaneously or simultaneously smoothly even when a large amount of communication signals are transmitted instantaneously. The above-mentioned collective cable is configured by arranging a large number of signal lines or signal line pairs in a plurality of layers from the inner side to the outer side. Note that the signal line is formed by coating the outer periphery with a covering material made of a low-density insulator, and the signal line pair is a two-core coaxial cable (Twinax) holding a pair of signal lines in parallel.
[0003]
Referring to FIG. 15, the two-core coaxial cable 101 has one or two drain lines 103 attached substantially in parallel to two signal lines 105A on the drain line connection side and a drain line 105B on the drain line non-connection side. The connector 107 to which the two-core coaxial cable 101 is shielded is connected to a signal contact 109 for connecting the two signal lines 105A and 105B and a ground contact 111 for connecting the drain line 103. Are provided.
[0004]
As a method of connecting to the connector 107, two signal lines 105 and 105B are respectively connected to the upper and lower surfaces of the signal contact 109 by soldering, for example, and the drain line 103 is connected to either of the upper and lower surfaces of the ground contact 111. For example, in FIG. 15, it is connected to the upper surface by soldering.
[0005]
[Problems to be solved by the invention]
By the way, in the conventional connection method to the connector 107, since the connection of the drain line 103 is only on one surface of the ground contact 111, the signal line 105A and the drain line 103 on the drain line connection side and the drain line There is a difference in the interval between the connection-side signal line 105B and the drain line 103, as indicated by the arrow in FIG. That is, the distance between the signal line 105A on the drain line connection side and the drain line 103 is smaller than the distance between the signal line 105B on the drain line non-connection side and the drain line 103.
[0006]
Due to this difference, the electric field generated between the signal lines 105A and 105B and the drain line 103 is different. In the signal line 105A close to the drain line 103, the ratio of the lines of electric force converging on the drain line 103 increases, and the induced electromotive force (crosstalk) decreases. On the other hand, the signal line 105B that is far from the drain line 103 has a problem that the ratio of the lines of electric force converging on the drain line 103 decreases, and the induced electromotive force (crosstalk) increases.
[0007]
Further, since the ground potential of each two-core coaxial cable 101 is made common, it is necessary to conduct the grounds of all the ground contacts 111, so that the ground becomes complicated, and the transmission characteristics may be an unstable factor. there were.
[0008]
SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and an object of the present invention is to make the distance between a drain line and a signal line equal so that the electric fields generated by the two signal lines are substantially symmetrical, and the electric field generated by the two signal lines is reduced. Cross-talk becomes uniform, as a result, near-end crosstalk is reduced and the characteristic impedance becomes uniform, and a connection method and a connector of a transmission cable enabling common ground connection are provided. .
[0009]
[Means for Solving the Problems]
In order to achieve the above object, a transmission cable connecting method according to the present invention according to claim 1 is a transmission cable connecting method for connecting a transmission cable having a pair of signal lines and one drain line to a connector. ,
A pair of signal lines are distributed and connected to upper and lower surfaces of a signal contact, and a drain line is connected to a substantially vertical center of a ground contact.
[0010]
Therefore, since the drain line is connected to the substantially vertical center of the ground contact, the distance between the drain line and each signal line becomes equal, the electric field generated by both signal lines becomes almost symmetric, and the crosstalk from both signal lines , And as a result, the near-end crosstalk is reduced, and the characteristic impedance of each signal line at the connector connection is also uniform.
[0011]
According to a second aspect of the present invention, there is provided a transmission cable connecting method for connecting a transmission cable having a pair of signal lines and two drain lines to a connector.
A pair of signal lines are distributed and connected to the upper and lower surfaces of the signal contact, one of the two drain lines is connected to the upper surface of one ground contact adjacent to one side of the signal contact, and the other drain line is connected. The signal contact is connected to the lower surface of another ground contact adjacent to the other side of the signal contact.
[0012]
Therefore, since the two drain lines are alternately connected to the upper and lower surfaces of the ground contacts on both sides, the common ground connection is easy, and the current flows between the two signal lines of the two-core coaxial cable and the ground. Becomes uniform. As a result, the near-end crosstalk is reduced, and the characteristic impedance of each signal line at the connector connection part is also uniform.
[0013]
In addition, since it is not necessary to provide a common ground inside the connector, and unnecessary wiring of the ground is not required, the shape of the connector can be simplified, and stable transmission characteristics can be obtained.
[0014]
According to a third aspect of the present invention, there is provided a connector for connecting a transmission cable having a pair of signal lines and one drain line,
A signal contact provided on the upper and lower surfaces with a connecting portion for distributing and connecting a pair of signal lines up and down, and a ground contact provided with a connecting portion for connecting the drain line substantially at the center in the vertical direction. It is a feature.
[0015]
Therefore, since the drain line is connected to the substantially vertical center of the ground contact, the distance between the drain line and each signal line becomes equal, and the electric field generated by both signal lines is reduced. As a result, the crosstalk from both signal lines becomes uniform, and as a result, the near-end crosstalk is reduced, and the characteristic impedance of each signal line at the connector connection becomes uniform.
[0016]
According to a fourth aspect of the present invention, in the connector according to the third aspect, the connection portion of the ground contact is a drain line insertion hole into which a drain line can be inserted.
[0017]
Therefore, since the connection portion is the drain wire insertion hole, the drain wire is easily inserted into the drain wire insertion hole and connected.
[0018]
According to a fifth aspect of the present invention, in the connector according to the third aspect, the connection portion of the ground contact is a drain line fixing clamp for clamping a drain line.
[0019]
Therefore, since the connection portion is a drain line fixing clamp, the drain line is easily inserted into the clamp hole of the drain line fixing clamp, and is easily clamped and connected with, for example, a fastening tool.
[0020]
According to a sixth aspect of the present invention, there is provided a connector for connecting a transmission cable including a pair of signal lines and two drain lines,
A signal contact provided on the upper and lower surfaces with connection portions for vertically distributing and connecting a pair of signal lines, and a first contact adjacent to one side of the signal contact and connecting one of the two drain lines to the upper surface. A first ground contact having a connection portion, and a second ground contact having a second connection portion adjacent to the other side of the signal contact and connecting the other of the two drain lines to the lower surface. It is characterized by comprising.
[0021]
Therefore, the operation is the same as that of the second aspect, and the two drain lines are alternately connected to the upper and lower surfaces of the ground contacts on both sides, so that common ground connection is easy and two lines of the two-core coaxial cable are connected. The current flow between the signal line and the ground becomes uniform. As a result, the near-end crosstalk is reduced, and the characteristic impedance of each signal line at the connector connection part is also uniform.
[0022]
In addition, since it is not necessary to provide a common ground inside the connector, and unnecessary wiring of the ground is not required, the shape of the connector can be simplified, and stable transmission characteristics can be obtained.
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0024]
As the transmission cable according to this embodiment, referring to FIGS. 13A and 13B, a two-core coaxial cable 1 has a coating material 5 made of an insulator on the outer periphery of a signal line 3 as a center conductor. The drain wire 7 is attached to the pair of the signal lines 3 and a tape material 9 such as aluminum is wound around the outer periphery.
[0025]
Referring to FIG. 1, the case where the above-described two-core coaxial cable 1 is connected as the connector 15 according to the embodiment of the present invention will be described. The connector 15 connects the two signal lines 3 of the two-core coaxial cable 1 up and down. A signal contact 19 provided on the upper and lower surfaces with connecting portions 17A and 17B for distributing and connecting to the ground, and a ground provided with, for example, a ground connecting portion 21 as a connecting portion for connecting the drain line 7 substantially at the center in the vertical direction. And a ground contact 23.
[0026]
As a method of connecting to the connector 15, the two signal lines 3 of the two-core coaxial cable 1 are distributed one by one to the connection portions 17A and 17B on the upper and lower surfaces of the signal contact 19 and connected by, for example, soldering. The drain line 7 is inserted from the left side into a through hole formed in the left-right direction as a ground connection part 21 substantially at the center of the ground contact 23 in the vertical direction, and is connected by, for example, soldering.
[0027]
Therefore, since the drain line 7 is connected to the through hole of the ground connection portion 21 at a position where it is symmetrically distributed in the vertical direction of the ground contact 23, the distance between the drain line and each signal line becomes equal, and both signal lines are generated. The electric field becomes substantially symmetric, crosstalk from both signal lines becomes uniform, and as a result, near-end crosstalk is reduced, and the characteristic impedance of each signal line at the connector connection becomes uniform.
[0028]
Incidentally, Table 1 shows a comparison table of the near-end crosstalk value between the conventional connector connection method and the connector connection method of this embodiment. A near-end crosstalk value (%) at each connection surface between the # 1, # 2, and # 3 cables 1 adjacent to each other and a total (%) of these near-end crosstalk values are shown.
[0029]
[Table 1]

From Table 1, comparing the cases of # 1 → # 2 and # 3 → # 2 shows that the connector connection method of this embodiment has a smaller difference in the near-end crosstalk value than the conventional method. Also, it can be seen that the method of this embodiment is smaller than the conventional method in the total (%) of the near-end crosstalk values.
[0030]
Next, some examples of the connector 15 according to another embodiment of the present invention will be described. Since these examples have substantially the same structure as the connector 15 of FIG. 1, the same members are denoted by the same reference numerals, and different points will be described.
[0031]
FIG. 2 shows another embodiment instead of FIG. In FIG. 2, the same components as those in FIG. 1 are denoted by the same reference numerals, and redundant description will be omitted.
[0032]
In FIG. 2, a drain wire 7 is inserted from the right side into a through hole formed in the left and right direction as a ground connection part 21 and connected by, for example, soldering.
[0033]
Therefore, the operation and effect in the case of FIG. 2 exhibit the same operation and effect as in FIG.
[0034]
Referring to FIG. 3, as the ground connection portion 21 of the ground contact 23, for example, a drain wire insertion hole 25 as a drain wire insertion hole into which the drain wire 7 can be inserted is formed in the front end face of the ground contact 23 in the vertical direction. It is provided almost at the center. Therefore, the drain wire 7 can be easily connected by being inserted into the drain wire press-fitting hole 25 by press-fitting.
[0035]
FIG. 4 shows another embodiment instead of FIG. In FIG. 4, the same components as those in FIG. 3 are denoted by the same reference numerals, and redundant description will be omitted.
[0036]
4, a drain wire press-fitting hole 25 as a ground connection portion 21 is provided substantially at the front upper and lower surfaces of the ground contact 23, and the drain wire 7 is inserted from above into a substantially central portion in the vertical direction and press-fitted. Connected easily.
[0037]
Therefore, the operation and effect in the case of FIG. 4 exhibit the same operation and effect as in FIG.
[0038]
FIG. 5 shows another embodiment instead of FIG. 5, the same components as those in FIG. 3 are denoted by the same reference numerals, and redundant description will be omitted.
[0039]
In FIG. 5, a drain wire press-fitting hole 25 serving as a ground connection portion 21 is provided downward in front of the ground contact 23, and the drain wire 7 is inserted by press-fitting into a substantially central portion from front to back. Easily connected.
[0040]
Therefore, the operation and effect in the case of FIG. 5 exhibit the same operation and effect as in FIG.
[0041]
FIG. 6 shows another embodiment instead of FIG. 6, the same components as those in FIG. 3 are denoted by the same reference numerals, and redundant description will be omitted.
[0042]
In FIG. 6, a drain wire press-fitting hole 25 serving as a ground connection portion 21 is provided on the upper and lower front surfaces of the ground contact 23 so as to be divided from the upper side to the lower side. And press-fit for easy connection.
[0043]
Therefore, the operation and effect in the case of FIG. 6 exhibit the same operation and effect as in FIG.
[0044]
Referring to FIG. 7, a connector 15 according to another embodiment is shown. A ground connection portion 21 of a ground contact 23 is, for example, a drain line insertion hole into which a drain line 7 can be inserted. The hole 27 is provided substantially at the center of the side surface of the ground contact 23 in the vertical direction, and the direction of the hole is toward the front end of the ground contact 23. For example, male and female press tools are used as the drain line insertion holes 27, and the drain line insertion holes 27 are formed in the ground contacts 23 by punching as shown in FIG.
[0045]
Therefore, the drain line 7 can be easily connected by inserting it into the drain line insertion hole 27.
[0046]
Referring to FIG. 9, a modified connector 15 of FIG. 7 is shown, wherein the hole 27 for drain line insertion is different from that of FIG. 7 and the direction of the hole is vertically directed to the side surface of the ground contact 23. . The operation and effect are almost the same as those in FIG.
[0047]
Referring to FIG. 10, a connector 15 according to another embodiment is shown. As a ground connection part 21 of a ground contact 23, a drain line fixing clamp 29 for inserting and clamping the drain line 7 is a ground contact. 23 is provided substantially at the center in the vertical direction. The drain wire fixing clamp 29 has a C-shaped cross section, and the direction of the clamp hole faces the front end side of the ground contact 23.
[0048]
Therefore, the drain wire 7 can be inserted easily into the clamp hole of the drain wire fixing clamp 29 and clamped with a fastening tool such as pliers, for example, to be easily connected.
[0049]
Referring to FIG. 11, a modified connector 15 shown in FIG. 10 is shown. The drain wire fixing clamp 29 is different from FIG. 10 in that the direction of the clamp hole is vertically directed to the side surface of the ground contact 23. I have. The operation and effect are substantially the same as those in FIG.
[0050]
Referring to FIG. 12, there is shown a modified connector 15 of FIG. 10, in which a drain line fixing clamp 29 is different from that of FIG. A groove is formed. The drain wire 7 is inserted into this round groove from the front and caulked. The operation and effect are the same as those in FIG.
[0051]
Referring to FIG. 14, a two-core coaxial cable 31 according to this embodiment is provided with two drain wires 33A and 33B, and is otherwise substantially the same as the two-core coaxial cable 1 shown in FIG. Therefore, similar members are denoted by the same reference numerals. In this embodiment, the two drain lines 33A and 33B are provided on both outer sides of the two signal lines 3.
[0052]
In addition, as the connector 35 of this embodiment to which the above-mentioned two-core coaxial cable 31 is connected, signal portions 37A and 37B for distributing and connecting the two signal lines 3 up and down are provided on the upper and lower surfaces. A contact 39 and a first connection portion 41 which is located on the left side of the signal contact 39 in FIG. 14 and which connects one of the two drain lines 33A and 33B to the upper surface thereof are provided. A ground contact 43 and a second ground contact 47 which is located on the right side of the signal contact 39 in FIG. 11 and has a second connection portion 45 for connecting the other drain line 33B to the lower surface are provided. Note that a first connection portion 53 for connecting one of the two drain wires 51A and 51B of the other two-core coaxial cable 49 is provided on the upper surface of the second ground contact 47. .
[0053]
As a method of connecting to the connector 35, the two signal lines 3 of the two-core coaxial cable 31 are distributed one by one to the upper and lower surfaces of the signal contact 39 and connected by, for example, soldering, and the two drain lines 33A are connected. , 33B, one drain line 33A is connected to the first connection portion 41 on the upper surface of the first ground contact 43 by, for example, soldering, and the other drain line 33B is connected to the second connection portion 45 on the lower surface of the second ground contact 47. For example, they are connected by soldering.
[0054]
When another two-core coaxial cable 49 is connected to the adjacent signal contact 55, one drain line 51 </ b> A of the two-core coaxial cable 49 is connected to the first connection portion 53 on the upper surface of the second ground contact 47 by, for example, soldering. The other drain line 51B is connected to the second connection portion 59 on the lower surface of the third ground contact 57 by, for example, soldering.
[0055]
Therefore, the case where a plurality of two-core coaxial cables 31 are connected to the connector 35 is the same as described above, and each of the two drain wires 33A and 33B of each of the plurality of two-core coaxial cables 31 has a corresponding signal. The first connection portions 41 and the second connection portions 45 of the ground contacts 43 and 47 on both sides of the contact 39 are alternately connected.
[0056]
As described above, each of the two drain wires 33A and 33B of the plurality of two-core coaxial cables 31 is connected to the first and second connection portions 41 and 45 on the upper and lower surfaces of the adjacent ground contacts 43 and 47 as described above. Since they are connected alternately, common ground connection can be easily performed, the current flow between the two signal lines 3 of the two-core coaxial cable 31 and the ground becomes uniform, the near-end crosstalk is reduced, and the connector is connected. The characteristic impedance of each signal line at the connection portion can be made uniform.
[0057]
In addition, there is no need to provide a common ground inside the connector 35, so that extra ground routing is not required, so that the connector shape can be simplified, and stable transmission characteristics can be obtained.
[0058]
The present invention is not limited to the above-described embodiment, but can be embodied in other modes by making appropriate changes.
[0059]
【The invention's effect】
As can be understood from the above description of the embodiment of the invention, according to the invention of claim 1, the drain line is connected to substantially the center in the vertical direction of the ground contact, so that the drain line is connected to each signal line. The distances are equal, the electric field generated by both signal lines is almost symmetric, the crosstalk from both signal lines is uniform, and as a result, the near-end crosstalk is reduced, and the characteristics of each signal line at the connector connection part are reduced. The impedance can be made uniform.
[0060]
According to the second aspect of the present invention, the two drain lines are alternately connected to the upper and lower surfaces of the ground contacts on both sides, so that the common ground connection can be easily performed and the two signal lines of the two-core coaxial cable, the ground, and the ground. During the current flow can be made uniform. The near-end crosstalk can be reduced, and the characteristic impedance of each signal line at the connector connection portion can be made uniform.
[0061]
In addition, there is no need to provide a common ground inside the connector, and no extra wiring of the ground is required, so that the connector shape can be simplified and stable transmission characteristics can be obtained.
[0062]
According to the third aspect of the present invention, the effect is the same as that of the first aspect, and since the drain line is connected to substantially the center of the ground contact in the vertical direction, the distance between the drain line and each signal line becomes equal. The electric field generated by the signal lines is substantially symmetric, crosstalk from both signal lines is uniform, and as a result, near-end crosstalk is reduced, and the characteristic impedance of each signal line at the connector connection is made uniform. Can be.
[0063]
According to the invention of claim 4, the drain wire can be easily inserted into the drain wire insertion hole and connected.
[0064]
According to the fifth aspect of the present invention, the drain wire can be easily inserted into the clamp hole of the drain wire fixing clamp, and the clamp connection can be easily performed by, for example, a fastening tool.
[0065]
According to the sixth aspect of the invention, the same effect as in the second aspect is achieved, and two drain lines are alternately connected to the upper and lower surfaces of the ground contacts on both sides, so that the common ground connection can be easily performed and the two cores can be connected. The current flow between the two signal lines of the coaxial cable and the ground can be made uniform. The near-end crosstalk can be reduced, and the characteristic impedance of each signal line at the connector connection portion can be made uniform.
[0066]
In addition, there is no need to provide a common ground inside the connector, and no extra wiring of the ground is required, so that the connector shape can be simplified and stable transmission characteristics can be obtained.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a connector connection state of a two-core coaxial cable according to an embodiment of the present invention.
FIG. 2 is a perspective view showing a connector connection state of a two-core coaxial cable according to another embodiment of the present invention instead of FIG. 1;
FIG. 3 is a perspective view showing a connector connection state of a two-core coaxial cable according to another embodiment of the present invention.
FIG. 4 is a perspective view showing a connector connection state of a two-core coaxial cable according to another embodiment of the present invention.
FIG. 5 is a perspective view showing a connector connection state of a two-core coaxial cable according to another embodiment of the present invention.
FIG. 6 is a perspective view showing a connector connection state of a two-core coaxial cable according to another embodiment of the present invention.
FIG. 7 is a perspective view showing a connector connection state of a two-core coaxial cable according to another embodiment of the present invention.
FIG. 8 is a side view of a ground connection portion viewed from the front end side of the ground contact of FIG. 7;
FIG. 9 is a perspective view showing a connector connection state of a two-core coaxial cable according to another embodiment of the present invention.
FIG. 10 is a perspective view showing a connector connection state of a two-core coaxial cable according to another embodiment of the present invention.
FIG. 11 is a perspective view showing a connector connection state of a two-core coaxial cable according to another embodiment of the present invention.
FIG. 12 is a perspective view showing a connector connection state of a two-core coaxial cable according to another embodiment of the present invention.
13A is a perspective view of a two-core coaxial cable, and FIG. 13B is a longitudinal sectional view of FIG.
FIG. 14 is a perspective view showing a connector connection state of a two-core coaxial cable according to another embodiment of the present invention.
FIG. 15 is a perspective view showing a connector connection state of a conventional two-core coaxial cable.
[Explanation of symbols]
1, 31, 49 Two-core coaxial cable 3 Signal line 7, 33A, 33B, 51A, 51B Drain line 15, 35 Connector 17A, 17B Connection part (of signal contact 19)
19, 39, 55 Signal contact 21 Ground connection part 23 Ground contact 25 Drain wire press-fit hole 27 Drain wire insertion hole 29 Drain wire fixing clamp 37A, 37B Connection part (of signal contact 39)
41 1st connection part (for 2 core coaxial cable 31)
43 First ground contact 45 Second connection part (for two-core coaxial cable 31)
47 Second ground contact 53 First connection part (for two-core coaxial cable 49)
57 Third ground contact 59 Second connection part (for two-core coaxial cable 49)

Claims (6)

In a transmission cable connection method for connecting a transmission cable having a pair of signal lines and one drain line to a connector,
A method of connecting a transmission cable, wherein a pair of signal lines are distributed and connected to upper and lower surfaces of a signal contact, and a drain line is connected to a substantially vertical center of a ground contact. In a transmission cable connection method for connecting a transmission cable having a pair of signal lines and two drain lines to a connector,
A pair of signal lines are distributed and connected to the upper and lower surfaces of the signal contact, one of the two drain lines is connected to the upper surface of one ground contact adjacent to one side of the signal contact, and the other drain line is connected. A method of connecting a transmission cable, comprising connecting to a lower surface of another ground contact adjacent to the other side of the signal contact. A connector for connecting a transmission cable having a pair of signal lines and one drain line,
A signal contact provided on the upper and lower surfaces with a connecting portion for distributing and connecting a pair of signal lines up and down, and a ground contact provided with a connecting portion for connecting the drain line substantially at the center in the vertical direction. Features connector. The connector according to claim 3, wherein the connection part of the ground contact is a drain line insertion hole into which a drain line can be inserted. 4. The connector according to claim 3, wherein the connection portion of the ground contact is a drain line fixing clamp for clamping the drain line. In a connector for connecting a transmission cable having a pair of signal lines and having two drain lines,
A signal contact provided on the upper and lower surfaces with connection portions for vertically distributing and connecting a pair of signal lines, and a first contact adjacent to one side of the signal contact and connecting one of the two drain lines to the upper surface. A first ground contact having a connection portion, and a second ground contact having a second connection portion adjacent to the other side of the signal contact and connecting the other of the two drain lines to the lower surface. A connector characterized by being constituted.

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