JP5598625B2 - Cable with shielding layer and cord with modular plug using the same - Google Patents
Cable with shielding layer and cord with modular plug using the same Download PDFInfo
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- JP5598625B2 JP5598625B2 JP2014062835A JP2014062835A JP5598625B2 JP 5598625 B2 JP5598625 B2 JP 5598625B2 JP 2014062835 A JP2014062835 A JP 2014062835A JP 2014062835 A JP2014062835 A JP 2014062835A JP 5598625 B2 JP5598625 B2 JP 5598625B2
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Description
本発明は、接地作業が不要で、隣接ケーブル間における差動信号クロストークが小さい遮蔽層付きケーブル、及びそれを用いたモジュラープラグ付きコードに関する。 The present invention relates to a cable with a shielding layer that requires no grounding work and has a small differential signal crosstalk between adjacent cables, and a cord with a modular plug using the cable.
対型メタリックケーブルにおいては、１０Ｇｂｐｓの伝送速度を持つイーサネット（登録商標）の標準化が８０２．３標準化団体にて行われている。このように、物理層において差動信号を用いて高速な伝送をすることが、今後も予期される。差動信号で伝送をする分野では、複数のケーブル回線間に生じる隣接ケーブル間の差動信号クロストークを抑制することが重要である。 In the pair-type metallic cable, the standardization of Ethernet (registered trademark) having a transmission rate of 10 Gbps is performed by the 802.3 standardization organization. In this way, high-speed transmission using differential signals in the physical layer is expected in the future. In the field of transmission using differential signals, it is important to suppress differential signal crosstalk between adjacent cables that occurs between a plurality of cable lines.
隣接ケーブル間における差動信号クロストークは、同一ケーブル内での差動信号クロストークのようにＬＳＩ（Ｌａｒｇｅ Ｓｃａｌｅ Ｉｎｔｅｇｒａｔｉｏｎ）によるアクティブキャンセル機能による補償対象にならないため、ケーブルそのものにおいて抑圧する必要がある。 The differential signal crosstalk between adjacent cables is not subject to compensation by an active cancel function by LSI (Large Scale Integration) like the differential signal crosstalk in the same cable, and thus must be suppressed in the cable itself.
しかし、そのためには、遮蔽層のない対型メタリックケーブルでは、隣接ケーブル同士の対撚り線間の離間距離を大きくする必要があり、ケーブルの直径を意図的に大きくするしかない。例えば、遮蔽層のない非シールドケーブルでは、対の撚りをより細かくし、非シールドケーブルの直径を意図的に大きくすることで、ある程度は隣接ケーブル間の差動信号クロストークを抑制できる。しかし、直径が大きくなるのは好ましくない。 However, for that purpose, in a pair-type metallic cable without a shielding layer, it is necessary to increase the distance between adjacent pairs of twisted wires, and the cable diameter must be increased intentionally. For example, in an unshielded cable without a shielding layer, differential signal crosstalk between adjacent cables can be suppressed to some extent by making the twist of the pair finer and intentionally increasing the diameter of the unshielded cable. However, it is not preferable to increase the diameter.
また、メタルケーブルで１０Ｇｂｐｓの伝送を行う１０ＧＢＡＳＥ−Ｔなどは、隣接ケーブル間の差動信号クロストークが同一ケーブル内の差動信号クロストークより直接的に伝送品質に大きく影響を与える。このような通信方式のために専用に設計された、いわゆるＡｕｇｍｅｎｔｅｄ Ｃａｔｅｇｏｒｙ６といわれるケーブルは、Ａ社の製品同士、Ｂ社の製品同士のように製造者が同じケーブルの組み合わせにおいては隣接ケーブル間の差動信号クロストークを所定値内に抑えることができる。しかし、Ａ社の製品とＢ社の製品のように製造者が異なるケーブルの組み合わせ、つまり設計が異なるケーブルが隣接する場合は、隣接ケーブル間の差動信号クロストークを抑圧できない。これは、製造業者が異なると、対撚りピッチ、集合ピッチ、シース厚等の条件組み合わせが異なり、これらの条件が隣接ケーブル間の差動信号クロストークに対してパラメータとして振る舞うからである。 In addition, in 10GBASE-T that performs transmission at 10 Gbps with a metal cable, differential signal crosstalk between adjacent cables directly affects transmission quality more directly than differential signal crosstalk in the same cable. The so-called Augmented Category 6 cable designed exclusively for such a communication system is the difference between adjacent cables in a combination of cables of the same manufacturer, such as products of Company A and products of Company B. The dynamic signal crosstalk can be suppressed within a predetermined value. However, when a combination of cables of different manufacturers, such as products of Company A and Company B, that is, cables with different designs are adjacent, differential signal crosstalk between adjacent cables cannot be suppressed. This is because different manufacturers have different combinations of conditions such as twisting pitch, assembly pitch, and sheath thickness, and these conditions behave as parameters for differential signal crosstalk between adjacent cables.
したがって、対型メタリックケーブルに隣接ケーブル間における不要な差動信号クロストークを低減させるための遮蔽層を設けるのが好ましい。 Therefore, it is preferable to provide a shield layer for reducing unnecessary differential signal crosstalk between adjacent cables in the pair-type metallic cable.
図６及び図７に、従来の遮蔽層付き対型メタリックケーブル（以下、単に遮蔽層付きケーブルという）を示す。遮蔽層付きケーブル６１は、１対ないし複数対の対撚り線６７の外周に内側外皮６８を有し、該内側外皮６８の外周に遮蔽層６６を有し、該遮蔽層６６の外周に外側外皮６９を有する。遮蔽層６６は、切れ目のない連続な導体６４からなる。対撚り線６７は、２本の絶縁心線７１を対にして撚り合わせたものである。遮蔽層６６は、長手方向に連続した導体６４からなるテープまたは金属箔で構成される。また、ポリエチレンのような絶縁性テープの面上にアルミ箔を圧着させたアルペットテープを遮蔽層６６に用いる。２本の絶縁心線７１の心線導体７２には、例えば、差動信号を伝送させる。 6 and 7 show a conventional pair-type metallic cable with a shielding layer (hereinafter simply referred to as a cable with a shielding layer). The cable 61 with a shielding layer has an inner skin 68 on the outer periphery of one or more pairs of twisted wires 67, has a shielding layer 66 on the outer periphery of the inner skin 68, and has an outer skin on the outer periphery of the shielding layer 66. 69. The shielding layer 66 is composed of a continuous conductor 64 without a break. The twisted pair wire 67 is formed by twisting two insulating core wires 71 in pairs. The shielding layer 66 is made of a tape or metal foil made of a conductor 64 continuous in the longitudinal direction. Further, an alpet tape in which an aluminum foil is pressure-bonded on the surface of an insulating tape such as polyethylene is used for the shielding layer 66. For example, a differential signal is transmitted to the core conductors 72 of the two insulated cores 71.
従来の遮蔽層付きケーブル６１は、遮蔽層のない対型メタリックケーブルに比べて、隣接ケーブル間における差動信号クロストークが十分に小さい。 The conventional cable 61 with a shielding layer has a sufficiently small differential signal crosstalk between adjacent cables as compared with a paired metallic cable without a shielding layer.
従来の遮蔽層付きケーブル６１は、遮蔽層６６が切れ目のない連続な導体６４からなるため、任意の長さに切り出された遮蔽層付きケーブル６１の両端間で遮蔽層６６が導通短絡している。これは、従来の遮蔽層付きケーブル６１が差動信号クロストークの抑圧だけでなく、同相信号のノイズを抑圧することも意図して構成されているからである。
ところで、従来の遮蔽層付きケーブルは、遮蔽層付きケーブルが敷設された電磁環境によっては、遮蔽層付きケーブルの片端もしくは両端において遮蔽層を確実に接地しなければならない。しかし、接地を確実に行うことは困難である。その理由は、接地の確認方法が目視検査やテスターによる導通検査しか確立されておらず、接地の品質を十分に確認できないためである。また、ＭＨｚ以上の高周波信号伝送における接地は、直流や５０〜６０Ｈｚの商用電源周波数における接地と同じでなく、高周波用の接地設備が必要であるが、日本国内では、建築躯体構造物に高周波の接地を行うことができるアースボンディング設備が完備されていないため、確実に接地ができない。 By the way, the conventional cable with a shielding layer needs to reliably ground the shielding layer at one end or both ends of the cable with the shielding layer depending on the electromagnetic environment in which the cable with the shielding layer is laid. However, it is difficult to reliably perform grounding. The reason is that the grounding confirmation method has been established only by visual inspection or continuity inspection by a tester, and the quality of grounding cannot be sufficiently confirmed. Moreover, grounding in high frequency signal transmission of MHz or higher is not the same as grounding in direct current or commercial power frequency of 50-60 Hz, and high frequency grounding equipment is necessary. Since there is no ground bonding equipment that can be grounded, it cannot be grounded reliably.
また、従来の遮蔽層付きケーブルは、施工（布設）をする際に少なくとも片端における遮蔽層の接地作業が必要になるため、施工のコストが高くなる。すなわち、施工のコストは、工事費用が材料費の倍以上の大きな比重を占めるため、接地作業があると多大になる。 Moreover, since the conventional cable with a shielding layer requires grounding work of the shielding layer at least at one end when construction (laying) is performed, the construction cost becomes high. That is, the construction cost becomes large if there is a grounding work because the construction cost occupies a large specific gravity more than double the material cost.
しかし、接地作業をせずに遮蔽層を地電位から開放してしまうと、遮蔽層が高周波に対して予期せぬアンテナとして振る舞うことがある。また、遮蔽層付きケーブルが布設された環境に存在する電磁場の影響で、遮蔽層付きケーブルの両端間に電位差が生じた場合、電位差を解消するための電流還流が遮蔽層に生じることがある。 However, if the shielding layer is released from the ground potential without grounding, the shielding layer may behave as an unexpected antenna for high frequencies. In addition, when a potential difference occurs between both ends of the cable with the shielding layer due to the influence of the electromagnetic field existing in the environment where the cable with the shielding layer is laid, current reflux for eliminating the potential difference may occur in the shielding layer.
以上の問題点をまとめると、隣接ケーブル間における差動信号クロストークを抑えるには遮蔽層が必要であるが、遮蔽層の接地作業が施工コスト高の要因となっているので、遮蔽層はあるが接地作業の必要がないケーブルには、潜在需要がある。 To summarize the above problems, a shielding layer is required to suppress differential signal crosstalk between adjacent cables, but there is a shielding layer because grounding work of the shielding layer is a cause of high construction costs. There is a potential demand for cables that do not require grounding.
そこで、本発明の目的は、上記課題を解決し、接地作業が不要で、隣接ケーブル間における差動信号クロストークが小さい遮蔽層付きケーブル、及びそれを用いたモジュラープラグ付きコードを提供することにある。 Accordingly, an object of the present invention is to provide a cable with a shielding layer that solves the above-described problems, does not require grounding work, and has a small differential signal crosstalk between adjacent cables, and a cord with a modular plug using the cable. is there.
上記目的を達成するために本発明は、複数対の対撚り線、これら対撚り線の外周に設けられた内側外皮、該内側外皮の外周に設けられた遮蔽層および該遮蔽層の外周に設けられた外側外皮を備え、１０ＧＢＡＳＥ−Ｔに用いられる遮蔽層付きケーブルであって、 前記遮蔽層は、１つの絶縁性テープと、該絶縁性テープの片面上に形成された複数の導体部であって、複数のスリットによって該絶縁性テープの長手方向において互いに分断された不連続な複数の導体部と、を有する不連続導体遮蔽テープが前記内側外皮の外周に巻きつけられることにより形成され、前記遮蔽層付きケーブルは、隣接ケーブル間における差動信号クロストークが前記遮蔽層によって抑制されると共に、前記遮蔽層付きケーブルの両端間で前記遮蔽層が導通短絡していない遮蔽層付きケーブルである。 To achieve the above object, the present invention provides a plurality of pairs of twisted wires, an inner skin provided on the outer periphery of the twisted wires, a shielding layer provided on the outer periphery of the inner sheath, and an outer periphery of the shielding layer. A cable with a shielding layer used for 10GBASE-T, wherein the shielding layer includes one insulating tape and a plurality of conductor portions formed on one side of the insulating tape. A discontinuous conductor shielding tape having a plurality of discontinuous conductor portions separated from each other in the longitudinal direction of the insulating tape by a plurality of slits, and is formed by being wound around the outer periphery of the inner skin, In the cable with a shielding layer, differential signal crosstalk between adjacent cables is suppressed by the shielding layer, and the shielding layer is short-circuited between both ends of the cable with the shielding layer. A shielding layer with a cable that does not have.
前記遮蔽層は、前記不連続導体遮蔽テープが横巻きされることにより形成されてもよい。 The shielding layer may be formed by laterally winding the discontinuous conductor shielding tape.
上記遮蔽層付きケーブルの両端に、モジュラープラグが取り付けられていてもよい。 Modular plugs may be attached to both ends of the cable with the shielding layer.
本発明は次の如き優れた効果を発揮する。 The present invention exhibits the following excellent effects.
（１）接地作業が不要である。 (1) No grounding work is required.
（２）隣接ケーブル間における差動信号クロストークが小さい。 (2) The differential signal crosstalk between adjacent cables is small.
以下、本発明の一実施形態を添付図面に基づいて詳述する。 Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
図１に示されるように、本発明に係る遮蔽層付きケーブル１は、絶縁性テープ２の面上に形成される導体部４と、導体部４を電気的に絶縁するスリット３とを有する不連続導体遮蔽テープ５が、導体部４で覆われない部分がないように重ね巻きされて遮蔽層６が形成されたものである。 As shown in FIG. 1, a cable 1 with a shielding layer according to the present invention includes a conductor portion 4 formed on the surface of an insulating tape 2 and a slit 3 that electrically insulates the conductor portion 4. The continuous conductor shielding tape 5 is overwrapped so that there is no portion that is not covered with the conductor portion 4, and the shielding layer 6 is formed.
遮蔽層６の内側には、遮蔽の対象となる導体線を配置する。本実施形態では、遮蔽の対象となる導体線は対撚り線７である。遮蔽層付きケーブル１は、１対ないし複数対の対撚り線７の外周に内側外皮８を有し、該内側外皮８の外周に遮蔽層６を有し、該遮蔽層６の外周に外側外皮９を有する。 Inside the shielding layer 6, a conductor wire to be shielded is arranged. In the present embodiment, the conductor wire to be shielded is the twisted pair wire 7. The shielded cable 1 has an inner skin 8 on the outer periphery of one or more pairs of twisted wires 7, a shield layer 6 on the outer periphery of the inner skin 8, and an outer skin on the outer periphery of the shield layer 6. 9
対撚り線７は従来より知られているので、説明を省く。この対撚り線７の周囲にポリ塩化ビニルやポリエチレン等の熱可塑性プラスチックにて内側外皮８が形成されている。外側外皮９は、遮蔽層６の保護層となるものである。外側外皮９の材料は可撓性を有するプラスチックであるが、特に限定しない。外側外皮９の厚さは、特に限定しない。 Since the twisted pair wire 7 is known conventionally, description is abbreviate | omitted. An inner skin 8 is formed around the twisted wire 7 with a thermoplastic such as polyvinyl chloride or polyethylene. The outer skin 9 serves as a protective layer for the shielding layer 6. The material of the outer skin 9 is a flexible plastic, but is not particularly limited. The thickness of the outer skin 9 is not particularly limited.
図２に示されるように、不連続導体遮蔽テープ５は、所定の幅を有し長手方向に延びた絶縁性テープ２の片面に、絶縁性テープ２を密に覆う導体部（導体がある部分）４と、絶縁性テープ２の縁に対して斜めに傾斜して反対縁まで延びた直線状のスリット（導体がない部分）３とを不連続導体遮蔽テープ５の長手方向に周期的に有する。この不連続導体遮蔽テープ５は、ポリエステルやポリイミド等を基材とする絶縁性テープ２の面上に、アルミや銅などの金属箔からなる導体部４が、該導体部４をテープ長手方向に分割して導通を遮断するためにスリット３を設けながら接着・圧着・エッチング・印刷などの工程により形成されたものである。絶縁性テープ２の厚さは特に限定しない。スリット３の形状、導体部４の形状は図示した平行四辺形に限定しない。個々の導体部４がスリット３によって分断されていればよい。導体部４の厚さは特に限定しない。 As shown in FIG. 2, the discontinuous conductor shielding tape 5 has a conductor portion (a portion with a conductor) that covers the insulating tape 2 tightly on one side of the insulating tape 2 having a predetermined width and extending in the longitudinal direction. ) 4 and linear slits (portions where there is no conductor) 3 inclined obliquely with respect to the edge of the insulating tape 2 and extending to the opposite edge are periodically provided in the longitudinal direction of the discontinuous conductor shielding tape 5. . The discontinuous conductor shielding tape 5 includes a conductor portion 4 made of a metal foil such as aluminum or copper on the surface of the insulating tape 2 made of polyester, polyimide, or the like as a base material. It is formed by a process such as adhesion, pressure bonding, etching, and printing while providing slits 3 to divide and cut off conduction. The thickness of the insulating tape 2 is not particularly limited. The shape of the slit 3 and the shape of the conductor portion 4 are not limited to the illustrated parallelogram. It is sufficient that each conductor portion 4 is divided by the slit 3. The thickness of the conductor part 4 is not specifically limited.
この不連続導体遮蔽テープ５が内側外皮８の外周に巻き付けられている。不連続導体遮蔽テープ５は重ね巻きされている。 The discontinuous conductor shielding tape 5 is wound around the outer periphery of the inner skin 8. The discontinuous conductor shielding tape 5 is wound in layers.
ここで、内側外皮８に遮蔽層６の導体部４で覆われない部分がないようにするために図１の遮蔽層付きケーブル１では、図２の不連続導体遮蔽テープ５が重ね巻きされる。これにより、内側外皮８は露出する部分（径方向外方に向けて素通しになる部分）が遮蔽層付きケーブル１の全周・全長に１箇所もなくなる。 Here, in order to prevent the inner skin 8 from having a portion not covered with the conductor portion 4 of the shielding layer 6, the discontinuous conductor shielding tape 5 of FIG. . As a result, the exposed portion of the inner skin 8 (portion through which the inner skin 8 is exposed toward the outside in the radial direction) does not exist in one place on the entire circumference / full length of the cable 1 with the shielding layer.
仮に、このことを意図せずに不連続導体遮蔽テープ５を内側外皮８の外周に任意の螺旋状に巻き付けたとすると、その巻き付けたものには、導体部４で覆われない部分が周方向あるいは長手方向に所定の周期で存在してしまう。内側外皮８が露出していると、その部分による構造不均等に起因して対撚り線７にインピーダンスの変動又は反射減衰両特性の異常点が発生する。 If the discontinuous conductor shielding tape 5 is wound around the outer periphery of the inner skin 8 in an arbitrary spiral shape without intending this, the portion that is not covered by the conductor portion 4 is circumferential or It exists in a predetermined cycle in the longitudinal direction. When the inner skin 8 is exposed, an impedance variation or an abnormal point of both reflection attenuation characteristics occurs in the twisted pair wire 7 due to the structural unevenness due to the portion.
そこで、本発明では、内側外皮８に遮蔽層６の導体部４で覆われない部分がないようにする。具体的には、不連続導体遮蔽テープ５を内側外皮８の外周に一重に巻いたとき、不連続導体遮蔽テープ５のスリット３上に導体部４が重なるように二重目以降の不連続導体遮蔽テープ５を螺旋状に重ねて巻く。スリット３の幅は、遮蔽層付きケーブル１がスリット３の部分が重ならないよう容易に巻き付け製造できるように、導体部４の幅より十分小さくするのが好ましい。好適には、スリット３の幅を導体部４の幅に対して十分の一程度にする。 Therefore, in the present invention, the inner skin 8 is made such that there is no portion not covered with the conductor portion 4 of the shielding layer 6. Specifically, when the discontinuous conductor shielding tape 5 is wound on the outer circumference of the inner skin 8 in a single layer, the discontinuous conductors in the second and subsequent layers are arranged so that the conductor portion 4 overlaps the slit 3 of the discontinuous conductor shielding tape 5. The shielding tape 5 is spirally overlapped and wound. The width of the slit 3 is preferably sufficiently smaller than the width of the conductor portion 4 so that the cable 1 with a shielding layer can be easily wound and manufactured so that the slit 3 portion does not overlap. Preferably, the width of the slit 3 is set to about one tenth of the width of the conductor portion 4.
図１の遮蔽層付きケーブル１は、絶縁性テープ２の片面に不連続な導体部４を有する不連続導体遮蔽テープ５によって遮蔽層６が形成されているため、任意の長さ（ただし、スリット３の離間ピッチより長い）に切り出された遮蔽層付きケーブル１の両端間で遮蔽層６が導通短絡していない。従って、施工時に遮蔽層６の接地作業をせずに遮蔽層６が地電位から開放されても、遮蔽層６が高周波に対して予期せぬアンテナとして振る舞うことがない。また、遮蔽層付きケーブル１が布設された環境に電磁場が存在しても、遮蔽層付きケーブル１の両端間に電位差が生じることがなく、電位差を解消するための電流還流が遮蔽層６に生じることがない。よって、遮蔽層６の接地作業は不要となる。 Since the shielding layer 6 is formed by the discontinuous conductor shielding tape 5 having the discontinuous conductor portions 4 on one side of the insulating tape 2, the cable 1 with the shielding layer of FIG. 1 has an arbitrary length (however, a slit The shielding layer 6 is not short-circuited between both ends of the cable 1 with the shielding layer cut out to a longer pitch than 3). Therefore, even if the shielding layer 6 is released from the ground potential without grounding the shielding layer 6 during construction, the shielding layer 6 does not behave as an unexpected antenna for high frequencies. Further, even if an electromagnetic field exists in the environment where the cable 1 with the shielding layer is laid, a potential difference does not occur between both ends of the cable 1 with the shielding layer, and a current reflux for eliminating the potential difference occurs in the shielding layer 6. There is nothing. Therefore, the grounding work of the shielding layer 6 is not necessary.
また、図１の遮蔽層付きケーブル１は、内側外皮８に遮蔽層６の導体部４で覆われない部分がないので、隣接ケーブル間における差動信号クロストークを抑制することができる。 Moreover, since the cable 1 with a shielding layer of FIG. 1 does not have a part which is not covered with the conductor part 4 of the shielding layer 6 in the inner skin 8, the differential signal crosstalk between adjacent cables can be suppressed.
図１の遮蔽層付きケーブル１は、隣接ケーブル間における差動信号クロストークを抑制する遮蔽効果を有しつつ、接地作業が不要な遮蔽層付きケーブルである。また、この遮蔽層付きケーブルは、構造不均等が存在しない遮蔽層付きケーブルである。 A cable 1 with a shielding layer in FIG. 1 is a cable with a shielding layer that has a shielding effect of suppressing differential signal crosstalk between adjacent cables and does not require grounding work. Moreover, this cable with a shielding layer is a cable with a shielding layer in which structural inhomogeneity does not exist.
次に、本発明の他の実施形態を説明する。 Next, another embodiment of the present invention will be described.
図３に示されるように、本発明に係る遮蔽層付きケーブル３１は、絶縁性テープ３２の面上にスリット３３によって分割された不連続な導体部３４を有する不連続導体遮蔽テープ３５が縦添え巻きされて遮蔽層３６が形成されている。 As shown in FIG. 3, the cable 31 with the shielding layer according to the present invention is provided with a discontinuous conductor shielding tape 35 having discontinuous conductor portions 34 divided by slits 33 on the surface of the insulating tape 32. The shielding layer 36 is formed by being wound.
遮蔽層３６の内側には、遮蔽の対象となる導体線を配置する。本実施形態では、遮蔽の対象となる導体線は対撚り線３７である。遮蔽層付きケーブル３１は、１対ないし複数対の対撚り線３７の外周に内側外皮３８を有し、該内側外皮３８の外周に遮蔽層３６を有し、該遮蔽層３６の外周に外側外皮３９を有する。 Inside the shielding layer 36, a conductor wire to be shielded is disposed. In the present embodiment, the conductor wire to be shielded is a twisted pair wire 37. The cable 31 with a shielding layer has an inner skin 38 on the outer periphery of one or more pairs of twisted wires 37, a shielding layer 36 on the outer periphery of the inner skin 38, and an outer skin on the outer periphery of the shielding layer 36. 39.
この実施形態では、不連続導体遮蔽テープ３５が縦添え巻きされていることに加え、不連続導体遮蔽テープ３５の表裏両面上にそれぞれスリット３３によって分割された不連続な導体部３４を有し、表裏のスリット３３が互いに重ならない点と、不連続導体遮蔽テープ３５が導体部３４を覆う絶縁部４１を有する点を特徴とする。 In this embodiment, in addition to the discontinuous conductor shielding tape 35 being vertically attached, the discontinuous conductor shielding tape 35 has discontinuous conductor portions 34 divided by slits 33 on both front and back surfaces, It is characterized in that the slits 33 on the front and back sides do not overlap each other and that the discontinuous conductor shielding tape 35 has an insulating part 41 that covers the conductor part 34.
図４に示されるように、不連続導体遮蔽テープ３５は、所定の幅を有し長手方向に延びた絶縁性テープ３２の両面に、絶縁性テープ３２を密に覆う導体部（導体がある部分）３４と、絶縁性テープ３２の縁に対して斜めに傾斜した直線状のスリット（導体がない部分）３３とを不連続導体遮蔽テープ３５の長手方向に周期的に有する。この不連続導体遮蔽テープ３５は、ポリエステルやポリイミド等を基材とする絶縁性テープ３２の表側面と裏側面の面上に、アルミや銅などの金属箔からなる導体部３４が、該導体部３４をテープ長手方向に分割して導通を遮断するためにスリット３３を設けながら接着・圧着・エッチング・印刷などの工程により形成されたものである。表側面のスリット３３を形成する位置と裏側面のスリット３３を形成する位置がわずかでも重ならないようにすることで先述の構造不均等による対撚り線の特性低下を防ぐことができる。すなわち、図５（ａ）及び図５（ｂ）に示されるように、表側面にスリット３３がある位置には、裏側面に必ず導体部３４があり、裏側面にスリット３３がある位置には、表側面に必ず導体部３４がある。 As shown in FIG. 4, the discontinuous conductor shielding tape 35 has a conductor portion (a portion with a conductor) that covers the insulating tape 32 on both sides of the insulating tape 32 having a predetermined width and extending in the longitudinal direction. ) 34 and linear slits (portions where there is no conductor) 33 inclined obliquely with respect to the edge of the insulating tape 32 are periodically provided in the longitudinal direction of the discontinuous conductor shielding tape 35. The discontinuous conductor shielding tape 35 includes a conductor portion 34 made of a metal foil such as aluminum or copper on the front side surface and the back side surface of an insulating tape 32 based on polyester, polyimide, or the like. 34 is formed by a process such as adhesion, pressure bonding, etching, and printing while providing a slit 33 in order to divide 34 in the longitudinal direction of the tape and cut off conduction. By preventing the position where the slit 33 on the front side surface is formed from the position where the slit 33 on the back side surface is slightly overlapped, it is possible to prevent deterioration of the characteristics of the twisted wire due to the above-described structural unevenness. That is, as shown in FIG. 5A and FIG. 5B, the position where the slit 33 is on the front side always has the conductor 34 on the back side and the position where the slit 33 is on the back side. There is always a conductor 34 on the front side.
また、図４に示されるように、不連続導体遮蔽テープ３５の片面には、その縁に沿って導体部３４の縁近傍を覆う絶縁部４１を長手方向全長にわたって有する。絶縁部４１は、塗装や別途の絶縁性テープの貼り付けにより形成する。絶縁部４１の幅は、不連続導体遮蔽テープ３５の幅と内側外皮３８の外周長との差以上にしておく。絶縁部４１の幅がこれより短いと表裏面の導体部３４が接触する。 Further, as shown in FIG. 4, an insulating portion 41 that covers the vicinity of the edge of the conductor portion 34 along the edge is provided on one side of the discontinuous conductor shielding tape 35 over the entire length in the longitudinal direction. The insulating part 41 is formed by painting or attaching a separate insulating tape. The width of the insulating portion 41 is set to be equal to or larger than the difference between the width of the discontinuous conductor shielding tape 35 and the outer peripheral length of the inner skin 38. If the width of the insulating portion 41 is shorter than this, the conductor portions 34 on the front and back surfaces come into contact with each other.
この不連続導体遮蔽テープ３５が内側外皮３８の外周に縦添えに巻き付けられている。 The discontinuous conductor shielding tape 35 is wound vertically around the outer periphery of the inner skin 38.
不連続導体遮蔽テープ３５は表裏に導体部３４を有するため、内側外皮３８の外周に縦添え巻きした場合、表裏の導体部３４が相互に接触して、任意の長さに切り出された遮蔽層付きケーブルの両端間で遮蔽層３６が導通短絡してしまうことが生じ得る。そこで、本発明では、不連続導体遮蔽テープ３５の片面に導体部３４を覆う絶縁部４１を設ける。不連続導体遮蔽テープ３５を縦添え巻きしたとき、導体部３４同士が直接接して重なることなく、絶縁部４１を介して重なるので、電気的な隔離を維持することができる。 Since the discontinuous conductor shielding tape 35 has the conductor portions 34 on the front and back, when the longitudinally wound on the outer periphery of the inner outer skin 38, the conductor portions 34 on the front and back contact each other, and the shielding layer cut out to an arbitrary length The shielding layer 36 may be short-circuited between both ends of the attached cable. Therefore, in the present invention, the insulating portion 41 that covers the conductor portion 34 is provided on one surface of the discontinuous conductor shielding tape 35. When the discontinuous conductor shielding tape 35 is wound vertically, the conductor portions 34 do not directly contact each other and overlap each other via the insulating portion 41, so that electrical isolation can be maintained.
図３の遮蔽層付きケーブル３１は、隣接ケーブル間における差動信号クロストークを抑制する遮蔽効果を有しつつ、接地作業が不要な遮蔽層付きケーブルである。また、この遮蔽層付きケーブルは、構造不均等が存在しない遮蔽層付きケーブルである。 The cable 31 with a shielding layer in FIG. 3 is a cable with a shielding layer that has a shielding effect of suppressing differential signal crosstalk between adjacent cables and does not require a grounding operation. Moreover, this cable with a shielding layer is a cable with a shielding layer in which structural inhomogeneity does not exist.
上記実施形態では、遮蔽層付きケーブル１、３１は、複数対の対撚り線７、３７の外周に内側外皮８、３８を有し、該内側外皮８、３８の外周に不連続導体遮蔽テープ５、３５からなる遮蔽層６、３６を有し、該遮蔽層６、３６の外周に外側外皮９、３９を有するものとしたが、本発明はこの構造に限定されない。例えば、内側外皮８、３８を省略し、不連続導体遮蔽テープ５、３５の絶縁性テープ２、３２を適宜な厚さとし、内側外皮８、３８の代わりとすることができる。 In the above-described embodiment, the cables 1 and 31 with the shielding layer have the inner skins 8 and 38 on the outer circumferences of the multiple pairs of twisted wires 7 and 37, and the discontinuous conductor shielding tape 5 on the outer circumferences of the inner skins 8 and 38. , 35 and the outer skins 9, 39 on the outer periphery of the shielding layers 6, 36, but the present invention is not limited to this structure. For example, the inner skins 8 and 38 can be omitted, and the insulating tapes 2 and 32 of the discontinuous conductor shielding tapes 5 and 35 can be made to have an appropriate thickness to replace the inner skins 8 and 38.
以上説明したように、本発明によれば、隣接ケーブル間における差動信号クロストークを抑制することができ、しかも、接地作業が不要となるため施工のコストが遮蔽層のないケーブルの施工コストと同等程度に低減される。 As described above, according to the present invention, differential signal crosstalk between adjacent cables can be suppressed, and grounding work becomes unnecessary, so the construction cost is the construction cost of a cable without a shielding layer. Reduced to the same extent.
本発明に係る遮蔽層付きケーブルは、高速差動信号伝送システムに利用できる。 The cable with a shielding layer according to the present invention can be used in a high-speed differential signal transmission system.
本発明に係る遮蔽層付きケーブルは、ＪＩＳＸ５１５０に代表されるようなトポロジーの配線システムに使用されると共に、両端モジュラープラグ付きコード用のケーブルとしても使用される。 The cable with a shielding layer according to the present invention is used for a wiring system having a topology as represented by JISX5150 and also used as a cable for a cord with modular plugs at both ends.
１、３１ 遮蔽層付きケーブル
２、３２ 絶縁性テープ
３、３３ スリット
４、３４ 導体部
５、３５ 不連続導体遮蔽テープ
６、３６ 遮蔽層
７、３７ 対撚り線
８、３８ 内側外皮
９、３９ 外側外皮
DESCRIPTION OF SYMBOLS 1,31 Cable with shielding layer 2,32 Insulating tape 3,33 Slit 4,34 Conductor part 5,35 Discontinuous conductor shielding tape 6,36 Shielding layer 7,37 Twisted wire 8,38 Inner skin 9,39 Outside Hull
Claims (2)
前記遮蔽層は、１つの絶縁性テープと、該絶縁性テープの片面上に形成された複数の導体部であって、複数のスリットによって該絶縁性テープの長手方向において互いに分断された不連続な複数の導体部と、を有する不連続導体遮蔽テープが、前記導体部が前記内側外皮と接するように該内側外皮の外周に横巻きされることにより形成され、
前記遮蔽層付きケーブルは、隣接ケーブル間における差動信号クロストークが前記遮蔽層によって抑制されると共に、前記遮蔽層付きケーブルの両端間で前記遮蔽層が導通短絡していないことを特徴とする遮蔽層付きケーブル。 A plurality of pairs of twisted pair, these twisted pairs of inner skin provided on an outer periphery, the inner shielding layer provided on the outer periphery of the side skin and shielding layer with cable obtaining Bei outer skin provided on the outer periphery of the shielding layer Because
The shielding layer is a single insulating tape and a plurality of conductor portions formed on one side of the insulating tape, and is a discontinuous portion separated from each other in the longitudinal direction of the insulating tape by a plurality of slits. discontinuous conductor shielding tape having a plurality of conductor portions, the is, the conductor portion is laterally wound on the outer periphery of the inner skin in contact with the inner skin is formed by Rukoto,
The shielded cable is characterized in that differential signal crosstalk between adjacent cables is suppressed by the shield layer, and the shield layer is not short-circuited between both ends of the cable with the shield layer. Layered cable.
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| JPH09185913A (en) * | 1995-12-28 | 1997-07-15 | Fujikura Ltd | Shielding cable |
| DE102004042656B3 (en) * | 2004-09-03 | 2005-12-29 | Draka Comteq Germany Gmbh & Co. Kg | Multi-layer, strip-shaped shielding foil for electrical lines and thus equipped electrical cable, in particular data transmission cable |
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