EP0296692A2 - Câble électrique multiconducteur à performance électrique contrôlée - Google Patents

Câble électrique multiconducteur à performance électrique contrôlée Download PDF

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Publication number
EP0296692A2
EP0296692A2 EP88300648A EP88300648A EP0296692A2 EP 0296692 A2 EP0296692 A2 EP 0296692A2 EP 88300648 A EP88300648 A EP 88300648A EP 88300648 A EP88300648 A EP 88300648A EP 0296692 A2 EP0296692 A2 EP 0296692A2
Authority
EP
European Patent Office
Prior art keywords
conductor
conductors
cable according
inner core
cable
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP88300648A
Other languages
German (de)
English (en)
Other versions
EP0296692A3 (fr
Inventor
Jerald Crawley
John Hostler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
WL Gore and Associates Inc
Original Assignee
WL Gore and Associates Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by WL Gore and Associates Inc filed Critical WL Gore and Associates Inc
Publication of EP0296692A2 publication Critical patent/EP0296692A2/fr
Publication of EP0296692A3 publication Critical patent/EP0296692A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
    • H01B7/1895—Internal space filling-up means
    • 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
    • H01B11/12—Arrangements for exhibiting specific transmission characteristics

Definitions

  • the present invention relates to a multi-conductor cable construction, in particular of miniature size, for transmission of data signals which has been designed to have a controlled electrical performance. More particularly the impedance and capacitance conductor-to-conductor and conductor-to-shield within the cable can be controlled.
  • Modern digital data processing and computing systems and other electronic apparatus have become increasingly miniaturized, the apparatus of many kinds are linked together in systems which may work together sometimes at a distance from the source of signal generation, and among which signals of less and less uniformity of shape and spacing are transmitted at higher and higher speeds.
  • Significant problems of clarity and accuracy of data transmission increasingly arise from faulty signal synchronization, recognition, and assembly and impedance matching where transmission cables offer less uniform or less controlled attenuation, impedance , and capacitance cpabilities to the systems.
  • a multi-conductor electrical cable having controlled impedance and capacitance conductor to conductor and conductor to shield, comprising an inner core of an insulative material around which a plurality of evenly-spaced electrical conductors are located, a layer of dielectric material surrounding said conductors and said inner core of insulation, and an outer insulating jacket.
  • the present invention provides a cable which controls impedance and capacitances signal to signal and signal to shield in small gauge wire applications such as, for example, those utilizing AWG 40 to AWG 44 wire.
  • Existing tape wrap technologies require too narrow a slit width at these gauge sizes.
  • metal conductors 1 are spiraled about a central core 2 of insulation material by a wire serving machine or other means.
  • the preferred range of wire size is AWG 20 - AWG 44.
  • a capstan can be used to pull insulation 2 at the required rate such that wires 1 can be spiraled or served on to it to achieve the desired spiral.
  • centre core insulation 2 may contain a centre conductor 6, as shown in Figure 3.
  • Insulation core 2 preferably comprises MIL-ENE (Registered trade mark) polyester, polytetrafluoroethylene (PTFE), or porous expanded PTFE (EPTFE), although other polymeric materials of suitable tensile strength and dielectric constant could be used.
  • the most preferred core is porous EPTFE.
  • a closing die on the serving machine may be used in some instances to embed the wires 1 partially into insulation 2 to ensure positional stability of wires 1 under stress when the cable is in use.
  • Typical insulative materials would be MIL-ENE (Registered Trade Mark) polyester, full density PTFE, or most preferably, EPTFE.
  • a shielding layer 4 can be braided, served or wound around the insulation layer 3. This can be aluminized foil, copper alloy braid, or served metal foil.
  • a final jacket layer 5 of protective insulation is placed or extruded on to the cable.
  • This jacket is suitably polyvinyl chloride (PVC), fluorinated ethylene-propylene (FEP) polymer, or polyfluoroalkyl vinyl ether (PFA).
  • the cable when containing small gauge conductors 1 (36 to 44 AWG), will provide strain relief to tension placed on the conductors, by distributing the majority of the load to the inner dielectric 2 rather than the conductors themselves since the conductors are spirally wrapped around the inner dielectric material 2.
  • the inner dielectric 2 can be made of a dielectric, such as EPTFE whose matrix tensile strength exceeds 7,000 psi (48,230Kpa), which makes it stronger than the conductors 1 and whose elongation is minimal, the vast majority of the load will be distributed to the dielectric material 2 rather than to the conductors 1. This property allows for the use of smaller conductors 2 without external strain relief techniques which add to the bulk of the cable.
  • the smaller overall diameter of the cable and the use of smaller gauge conductors makes for a lighter and more flexible cable, making the cable advantageous in peripheral equipment interconnection applications.
  • a feature of the cable is its flexibility which allows the use of a variety of signal transmission applications.
  • Several different gauges of conductor 1 may be used at the same time around core 2 depending on the particular application.
  • a conductor may be placed in the centre of the inner core with each conductor placed on the outer shell of the dielectric equally separated, as shown in Figure 3, from the inner conductor thus giving each conductor a consistent and similar impedance signal (outer conductor 1) to ground (inner conductor 6).
  • Inner conductor 6 may be optionally utilized for a ground or a signal conductor.
  • an overall shield 4 is employed separated from the conductors 1 by an outer dielectric 3 of EPTFE, PTFE, MIL-ENE (Trade Mark) or other insulating material, as depicted in Figure 2, by controlling the thickness of the insulation between conductors and shield, a consistent and similar impedance may be achieved between each conductor and the overall shield. In addition, by choosing a desirable inner dielectric overall diameter and equally spacing each conductor around the dielectric, similar impedances can be achieved between any conductor and any adjacent conductor.
  • Alternate conductors may be ground, not signal conductors, where low cross-talk is desired.
  • Many of the electrical properties including impedance, capacitance, velocity of propagation, and time delay can be controlled by choosing a dielectric material 2 suitable for the application and or designating a particular number of revolutions of conductor per centimeter around the inner dielectric 2.
  • One benefit of the present invention is that it enhances productivity in the manufacturing of multi-conductor cables since in many cases the signal carrying conductors need not be individually insulated.
  • Another preferred feature of the invention is the decrease in overall diameter of a multiple conductor cable having an equal number of conductors of the same size over one fabricated using existing technology. This smaller overall diameter is achieved by embedding each conductor in a dielectric material and by not separately insulating each individual conductor.
  • EPTFE used in this invention is the porous expanded PTFE disclosed in one or more of U.S. Patents 3,953,566; 3,962,153; 4,096,227; 4,110,392; and 4,187,390.

Landscapes

  • Communication Cables (AREA)
  • Insulated Conductors (AREA)
EP88300648A 1987-06-22 1988-01-27 Câble électrique multiconducteur à performance électrique contrôlée Withdrawn EP0296692A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US64715 1979-08-08
US6471587A 1987-06-22 1987-06-22

Publications (2)

Publication Number Publication Date
EP0296692A2 true EP0296692A2 (fr) 1988-12-28
EP0296692A3 EP0296692A3 (fr) 1989-05-10

Family

ID=22057814

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88300648A Withdrawn EP0296692A3 (fr) 1987-06-22 1988-01-27 Câble électrique multiconducteur à performance électrique contrôlée

Country Status (7)

Country Link
EP (1) EP0296692A3 (fr)
AU (1) AU8288887A (fr)
DK (1) DK339788A (fr)
FI (1) FI882996A (fr)
GB (1) GB2206439A (fr)
NO (1) NO880927L (fr)
PT (1) PT86981B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995005668A1 (fr) * 1993-08-16 1995-02-23 W.L. Gore & Associates, Inc. Cable acheminant des signaux electriques ayant des caracteristiques de champ egales pour chaque conducteur de signaux
EP1170756A2 (fr) * 2000-07-07 2002-01-09 Greenlee Textron Inc. Cordons de raccordement stables pour des instruments d'essai d'un réseau local
WO2008043948A2 (fr) * 2006-10-11 2008-04-17 Nexans Cable de contrôle éléctrique et procédé de fabrication associé

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB421073A (en) * 1933-07-14 1934-12-13 Pirelli General Cable Works Improvements in or relating to flexible multicore electric cables
FR924554A (fr) * 1945-03-30 1947-08-08 Int Standard Electric Corp Perfectionnements aux câbles de communication
DE2516830A1 (de) * 1975-04-15 1976-10-28 Aeg Telefunken Kabelwerke Verseilelement fuer elektrische kabel
DE3144743A1 (de) * 1981-11-11 1983-05-19 U.I. Lapp Kg, 7000 Stuttgart Elektrische, flexible leitung mit besonderer widerstandsfaehigkeit gegen torsionsbeanspruchung

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB667159A (en) * 1950-01-12 1952-02-27 Simplex Wire & Cable Company Improvements in or relating to submarine cables
NL301013A (fr) * 1962-11-27
US3351706A (en) * 1965-03-18 1967-11-07 Simplex Wire & Cable Co Spaced helically wound cable
US3324417A (en) * 1965-03-25 1967-06-06 Gen Cable Corp Shielded common return pairs and coaxial cable
FR93154E (fr) * 1966-01-20 1969-02-21 Chavanoz Moulinage Retorderie Fil conducteur inextensible.
US3800066A (en) * 1972-10-30 1974-03-26 Schlumberger Technology Corp Gas blocked logging cable
US4250351A (en) * 1979-08-08 1981-02-10 The Bendix Corporation Cable construction
GB2079890A (en) * 1980-04-17 1982-01-27 Greengate Cables Ltd Reinforced Tubing or Cable
DE3111468A1 (de) * 1981-03-24 1982-10-14 Anton Piller GmbH & Co KG, 3360 Osterode Starkstromnetz fuer mittelfrequenzdrehstrom und starkstromkabel fuer mittelfrequenzdrehstrom

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB421073A (en) * 1933-07-14 1934-12-13 Pirelli General Cable Works Improvements in or relating to flexible multicore electric cables
FR924554A (fr) * 1945-03-30 1947-08-08 Int Standard Electric Corp Perfectionnements aux câbles de communication
DE2516830A1 (de) * 1975-04-15 1976-10-28 Aeg Telefunken Kabelwerke Verseilelement fuer elektrische kabel
DE3144743A1 (de) * 1981-11-11 1983-05-19 U.I. Lapp Kg, 7000 Stuttgart Elektrische, flexible leitung mit besonderer widerstandsfaehigkeit gegen torsionsbeanspruchung

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995005668A1 (fr) * 1993-08-16 1995-02-23 W.L. Gore & Associates, Inc. Cable acheminant des signaux electriques ayant des caracteristiques de champ egales pour chaque conducteur de signaux
EP1170756A2 (fr) * 2000-07-07 2002-01-09 Greenlee Textron Inc. Cordons de raccordement stables pour des instruments d'essai d'un réseau local
EP1170756A3 (fr) * 2000-07-07 2002-12-11 Greenlee Textron Inc. Cordons de raccordement stables pour des instruments d'essai d'un réseau local
WO2008043948A2 (fr) * 2006-10-11 2008-04-17 Nexans Cable de contrôle éléctrique et procédé de fabrication associé
FR2907256A1 (fr) * 2006-10-11 2008-04-18 Nexans Sa Cable de controle electrique et procede de fabrication associe
WO2008043948A3 (fr) * 2006-10-11 2008-06-05 Nexans Cable de contrôle éléctrique et procédé de fabrication associé

Also Published As

Publication number Publication date
AU8288887A (en) 1988-12-22
GB2206439A (en) 1989-01-05
NO880927D0 (no) 1988-03-02
GB8801778D0 (en) 1988-02-24
PT86981B (pt) 1995-03-01
DK339788A (da) 1988-12-23
DK339788D0 (da) 1988-06-21
PT86981A (pt) 1989-05-31
FI882996A (fi) 1988-12-23
EP0296692A3 (fr) 1989-05-10
FI882996A0 (fi) 1988-06-22
NO880927L (no) 1988-12-23

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