CN1101050C - 具有改进型屏蔽结构的电缆 - Google Patents
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- CN1101050C CN1101050C CN94108245A CN94108245A CN1101050C CN 1101050 C CN1101050 C CN 1101050C CN 94108245 A CN94108245 A CN 94108245A CN 94108245 A CN94108245 A CN 94108245A CN 1101050 C CN1101050 C CN 1101050C
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- 239000002131 composite material Substances 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 abstract description 6
- 230000005611 electricity Effects 0.000 description 2
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B11/00—Communication cables or conductors
- H01B11/02—Cables with twisted pairs or quads
- H01B11/06—Cables with twisted pairs or quads with means for reducing effects of electromagnetic or electrostatic disturbances, e.g. screens
- H01B11/10—Screens specially adapted for reducing interference from external sources
- H01B11/1016—Screens specially adapted for reducing interference from external sources composed of a longitudinal lapped tape-conductor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B11/00—Communication cables or conductors
- H01B11/02—Cables with twisted pairs or quads
- H01B11/06—Cables with twisted pairs or quads with means for reducing effects of electromagnetic or electrostatic disturbances, e.g. screens
Abstract
本发明公开了用于传输差动逻辑信号、具有改进型屏蔽层(70)的传输电缆(60)。该电缆包括一对并排放置的绝缘信号导线(62,64),用具有导电材料层(82)的屏蔽包裹层(72)包裹这两根信号导线。在屏蔽包裹层(72)的外侧,与其中一根信号导线(62)相邻,沿轴向放置一根未非绝缘的漏电导线。导电材料层(82)沿漏电导线(66)的外侧继续包裹,因而形成该屏蔽的额外包裹层(74),并至少包裹电缆组的一部分。漏电导线(66)与屏蔽材料(82)保持电气接触。
Description
本发明涉及一种电缆,它具有至少两根绝缘信号导线和一根与屏蔽层保持接触的漏电导线,屏蔽层沿电缆长度方向包裹信号导线。
现代信号传输电缆一般沿电缆长度方向用薄导电箔屏蔽,并且包含一根与箔保持接触的漏电导线用以端接箔屏蔽层。图1中的10表示这种传输电缆。电缆10包括一对绝缘信号导线12和14及一根非绝缘的漏电导线16,如图中所示,三根导线并排排列。导电屏蔽材料层18包裹三根导线组,以使屏蔽层与非绝缘的漏电导线保持电接触。该屏蔽层可防止电缆辐射,同时隔离附近的或杂散信号。这种具有平缓结构的电缆其优势在于便于线路敷设和其他某些应用中的电缆控制工作。当这种电缆用于具有相当快的上升时间和高比特率的差动逻辑信号传输时,沿两根信号导线12和14的信号传输时延就变得十分重要。图1中示出的气隙20导致屏蔽层与两根信号导线间的不对称电容耦合。由于气隙对导线12上信号的影响大于对导线14上信号的影响,使其具有不同的介电常数,因此引起两个信号的传输时延不同。在快速开关电路、高速时钟信号线路和长距离电缆结构中,这种传输时延差,会导致输出信号达不到阈值,即或是达到了阈值,也会由于信号脉冲太窄而使其缺乏足够的能量被识别为一个数据位,因而造成奇偶校验错误。解决这一问题的办法是在空间22中安置漏电导线,并贴着两根信号导线的绝缘层外侧。然而,这样又在原平面上增加了一个凸度,因此,不利用许多应用时的安装。此外,这种排列使得通过自动设备端接漏电导线变得困难。
因此,本发明的目的是提供一种传输电缆,其信号导线应具有基本相同的传输时延,同时通过将漏电导线布置在与两根信号导线具有同一中心线的位置使其保持理想的平缓轮廓。
本发明揭示的屏蔽电缆包含至少两根并排排列的绝缘导线,从而使得它们的轴限定一个平面,还包括一个屏蔽层,以及其轴线的位置与所述平面基本上平行的一条非绝缘漏电导线,其特征在于,所述的屏蔽层完全围绕所述的两条绝缘导线延伸,但并不在这两条导线之间,从而形成一个全屏蔽包裹层,而且,所述屏蔽层也部分在所述全屏蔽包裹层之上延伸,从而形成一个部分屏蔽包裹层,使得所述的非绝缘漏电导线位于所述全屏蔽包裹层和所述部分屏蔽包裹层之间。
以下将通过例示参照附图对本发明进行说明:
图1为工业中常见的传输电缆的截面图。
图2为图1中所示电缆的时延偏移的图形表示。
图3、4、5为由时延偏移所造成的输出信号的图形表示。
图6是对本发明进行图示讲解说明的传输电缆截面图。
图2为图1中一对绝缘导线12和14传输时延的图形表示,在工业中称其为“时延偏移”。以下对将其用于本发明时,造成时延偏移的原因之一做简短的讨论。
在电缆的输入端30处给两根信号导线施加一个信号,每根导线上用单脉冲32表示。注意,在差动模式中,这两个脉冲应有180度的相位差,但为说明清楚起见,以同相位示之。当信号到达电缆输出端34时,脉冲向右侧偏移,如图2所示,其偏移量与该特别类型和长度的电缆的传输时延相等。这些有了偏移的脉冲用36和38表示。值得注意的是,导线14的传输时延是tD2,而导线12的时延比它小,为tD1,这是由气隙20所致。工业中所称的时延偏移定义为tD2-tD1的
绝对值。这种时延偏移用图3、4、5做了进一步的图解说明。在图3中,用脉冲形式40和42表示的差动信号施加在导线12和14的输入端上。如果在该点取样输出信号,该信号看去和脉冲44一样,其峰值均在阈电压46之上,并具有一个全宽持续时间。若在距电缆输入端较远处的一点取样输出信号,脉冲42的位置相对脉冲40的位置会有所滞后,造成明显的时延偏移。这会造成类似于图4中脉冲48的输出信号。注意,脉冲48超出阈电压部分的宽度比图3中脉冲44的宽度要窄得多。同样,若在沿电缆方向更远处取样输出信号,则时延偏移更大,造成非常窄的脉冲宽度,如图5中的50所示。虽然脉冲50确实超出阈电压,但由于其超出部分太窄,以至于没有足够的能量作为一个有效数据位被接收。若时延偏移进一步增大,脉冲50可能达不到阈电压46,上述任何一种情况都会造成奇偶校验错误。例如,图1所示电缆的典型时延偏移是每英尺42微微秒,对于100英尺长的电缆,其时延偏移为4.2毫微秒。在高频应用中,如500兆赫兹及以上,其脉冲宽度只有1毫微秒或更少,4.2毫微秒的时延偏移是绝对无法工作的。
通过在导线与气隙20之间加屏蔽层,将气隙对绝缘导线12的影响加以屏蔽,可显著减小这种时延偏移。这种结构如图6所示。此处,电缆60具有第一根和第二根绝缘信号导线,分别由62和64表示,和一根漏电导线66,它们的轴心在同一平面68上。一个屏蔽层70完全包裹两根绝缘导线62和64,至少有一层全包裹72,之后,额外的部分至少由部分包裹层74包裹漏电导线66,并且和全包裹层72端接,这样,漏电导线便夹在包裹层72和74之间。屏蔽层70由两层复合而成,一层80为绝缘材料,诸如聚酯或其他合适的载体材料,另一层82为铝或其他合适的导电材料,它淀积在载体上,或附着在载体上。在这种布置下,气隙84与漏电导线66相邻,并和绝缘信号导线62相隔离,因此不会显著影响该信号导线的传输时延。例如,图6中电缆的一般时延偏移为每英尺5微微秒,从而100英尺长的电缆有0.5毫微秒的时延偏移。对于500兆赫兹的应用,这充分在可接受的工作范围之内。包裹层72可以多层包裹两根绝缘导线,部分包裹层74可以对整组导线进行全包裹,或者多层包裹。其唯一要求是漏电导线66要安排在任何两个相邻包裹层之间,并与其中的包裹层82保持电气接触。在该实施例中,非绝缘的漏电导线66与包裹层74中的导电层82保持电气接触。
在当前例子中,尽管漏电导线66的轴在平面68上,但若不希望或不需要有平缓的电缆轮廓时,也不必如此。另外,导电层82和非导电层80可以倒置,使导电层背朝包裹层72面向外,这样使漏电导线66与包裹层72的导电层保持电气接触,而不再与包裹层74的导电层电气接触。一个替换实施例,如图7所示,用这种倒置的包裹层70只包裹两根绝缘信号导线62和64。而非绝缘的漏电导线66借助于外层套90与导电层82保持电气接触。
本发明的主要优点是,在差动对电缆中,可显著减小信号偏移,使偏移量小到可忽略不计的程度,或是完全消除偏移。同时使漏电导线与两根信号导线在同一平面内,便于电缆控制。此外,将漏电导线与信号导线置于同一平面还使通过自动设备进行寻找和端接变得更容易。
Claims (5)
1.一种电缆,该电缆包括至少两根并排排列的绝缘导线,从而使得它们的轴限定一个平面,还包括一个屏蔽层,以及其轴线的位置与所述平面基本上平行的一条非绝缘漏电导线,其特征在于,所述的屏蔽层完全围绕所述的两条绝缘导线延伸,但并不在这两条导线之间,从而形成一个全屏蔽包裹层,而且,所述屏蔽层也部分在所述全屏蔽包裹层之上延伸,从而形成一个部分屏蔽包裹层,使得所述的非绝缘漏电导线位于所述全屏蔽包裹层和所述部分屏蔽包裹层之间。
2.如权利要求1所述的电缆,其特征在于,所述屏蔽层是连续的层。
3.如权利要求2所述的电缆,其特征在于,所述屏蔽层包括背对背排列的作为单个复合层的非导电材料层和导电材料层。
4.如权利要求3所述的电缆,其特征在于,所述的导电材料层向内朝向所述的漏电导线。
5.如权利要求1所述的电缆,其特征在于,所述的漏电导线与所述部分屏蔽包裹层保持电气接触。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/091,577 US5416268A (en) | 1993-07-14 | 1993-07-14 | Electrical cable with improved shield |
US091,577 | 1993-07-14 | ||
US091577 | 1993-07-14 |
Publications (2)
Publication Number | Publication Date |
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CN1102501A CN1102501A (zh) | 1995-05-10 |
CN1101050C true CN1101050C (zh) | 2003-02-05 |
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Application Number | Title | Priority Date | Filing Date |
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CN94108245A Expired - Fee Related CN1101050C (zh) | 1993-07-14 | 1994-07-13 | 具有改进型屏蔽结构的电缆 |
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Country | Link |
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US (1) | US5416268A (zh) |
EP (1) | EP0634755B1 (zh) |
JP (1) | JP3659667B2 (zh) |
KR (1) | KR100344867B1 (zh) |
CN (1) | CN1101050C (zh) |
DE (1) | DE69421853T2 (zh) |
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JP2015130326A (ja) * | 2013-12-10 | 2015-07-16 | デルファイ・テクノロジーズ・インコーポレーテッド | 遮蔽ケーブルアセンブリ |
GB2524286B (en) * | 2014-03-19 | 2020-09-23 | Glanfield Anthony | Leak detection apparatus and methods |
US10079082B2 (en) * | 2015-07-30 | 2018-09-18 | Alltop Electronics (Suzhou) Ltd. | Data transmission cable |
JP6834732B2 (ja) * | 2017-04-12 | 2021-02-24 | 住友電気工業株式会社 | 二芯平行ケーブル |
US10950367B1 (en) * | 2019-09-05 | 2021-03-16 | Te Connectivity Corporation | Electrical cable |
US11342097B2 (en) * | 2020-08-03 | 2022-05-24 | Dell Products L.P. | Spiral shielding on a high speed cable |
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US3032604A (en) * | 1959-03-30 | 1962-05-01 | Belden Mfg Co | Electrical cable |
US3673315A (en) * | 1970-09-08 | 1972-06-27 | Belden Corp | Shielded cable |
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US4098346A (en) * | 1976-10-01 | 1978-07-04 | Deere & Company | Steering for plow with adjustable plow bottoms |
US4323721A (en) * | 1980-02-08 | 1982-04-06 | Belden Corporation | Electric cables with improved shielding member |
US4327246A (en) * | 1980-02-19 | 1982-04-27 | Belden Corporation | Electric cables with improved shielding members |
DE3011868A1 (de) * | 1980-03-27 | 1981-10-01 | Kabel- und Metallwerke Gutehoffnungshütte AG, 3000 Hannover | Feuchtigkeitsgeschuetztes elektrisches energiekabel |
US4374299A (en) * | 1980-05-19 | 1983-02-15 | Belden Corporation | Triboelectric transducer cable |
US4510346A (en) * | 1983-09-30 | 1985-04-09 | At&T Bell Laboratories | Shielded cable |
CA1242006A (en) * | 1985-12-16 | 1988-09-13 | Lawrence O'connor | Tape for wrapping electrical conductors |
US4800236A (en) * | 1986-08-04 | 1989-01-24 | E. I. Du Pont De Nemours And Company | Cable having a corrugated septum |
GB8717954D0 (en) * | 1987-07-29 | 1987-09-03 | Kt Technologies Inc | Cable shielding tape |
-
1993
- 1993-07-14 US US08/091,577 patent/US5416268A/en not_active Expired - Lifetime
-
1994
- 1994-05-20 EP EP94303610A patent/EP0634755B1/en not_active Expired - Lifetime
- 1994-05-20 DE DE69421853T patent/DE69421853T2/de not_active Expired - Fee Related
- 1994-07-07 KR KR1019940016331A patent/KR100344867B1/ko not_active IP Right Cessation
- 1994-07-13 CN CN94108245A patent/CN1101050C/zh not_active Expired - Fee Related
- 1994-07-13 JP JP18384694A patent/JP3659667B2/ja not_active Expired - Fee Related
Cited By (1)
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CN104221235A (zh) * | 2012-04-20 | 2014-12-17 | 住友电装株式会社 | 线束及线束的制造方法 |
Also Published As
Publication number | Publication date |
---|---|
KR960015605A (ko) | 1996-05-22 |
EP0634755B1 (en) | 1999-12-01 |
KR100344867B1 (ko) | 2002-11-18 |
DE69421853T2 (de) | 2000-07-06 |
US5416268A (en) | 1995-05-16 |
EP0634755A2 (en) | 1995-01-18 |
EP0634755A3 (en) | 1996-06-05 |
JPH0757563A (ja) | 1995-03-03 |
CN1102501A (zh) | 1995-05-10 |
JP3659667B2 (ja) | 2005-06-15 |
DE69421853D1 (de) | 2000-01-05 |
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