EP0477006B1 - Hochohmiges elektrisches Kabel und Verfahren zur Herstellung - Google Patents

Hochohmiges elektrisches Kabel und Verfahren zur Herstellung Download PDF

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Publication number
EP0477006B1
EP0477006B1 EP19910308533 EP91308533A EP0477006B1 EP 0477006 B1 EP0477006 B1 EP 0477006B1 EP 19910308533 EP19910308533 EP 19910308533 EP 91308533 A EP91308533 A EP 91308533A EP 0477006 B1 EP0477006 B1 EP 0477006B1
Authority
EP
European Patent Office
Prior art keywords
conductors
conductor
surface portion
cable assembly
electrical 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.)
Expired - Lifetime
Application number
EP19910308533
Other languages
English (en)
French (fr)
Other versions
EP0477006A1 (de
Inventor
Richard F. Strauss
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.)
ABB Installation Products Inc
Original Assignee
Thomas and Betts Corp
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
Priority claimed from US07/585,858 external-priority patent/US5049215A/en
Priority claimed from US07/585,860 external-priority patent/US5091610A/en
Application filed by Thomas and Betts Corp filed Critical Thomas and Betts Corp
Publication of EP0477006A1 publication Critical patent/EP0477006A1/de
Application granted granted Critical
Publication of EP0477006B1 publication Critical patent/EP0477006B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01B7/08—Flat or ribbon cables
    • H01B7/0823—Parallel wires, incorporated in a flat insulating profile
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/0006—Apparatus or processes specially adapted for manufacturing conductors or cables for reducing the size of conductors or cables
    • 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
    • H01B7/0009—Details relating to the conductive cores

Definitions

  • This invention relates generally to high impeded electrical cable and also relates to a method of forming a high impedance cable having conductors being spaced at a given pitch.
  • Cable of this type typically includes a plurality of electrical conductors arranged in side-by-side spaced orientation. These conductors are surrounded by an insulative casing which electrically isolates each of the conductors.
  • each conductor measured by the cross-sectional area, dictates the amount of signal current that each conductor can carry.
  • the amount of signal current carried is directly proportional to the size of the conductor.
  • the impedance value of the cable is related, in part, to the spacing between adjacent conductors.
  • the greater the space between adjacent conductors i.e. the more insulating mass therebetween the greater the impedance value of the cable.
  • Wires of non-circular cross-section are known, for example, from GB-A-336 784 which shows condenser wires used as supplementary wires on trunk cables.
  • the two condenser wires in one embodiment are semicircular in cross-section, and planar surfaces face one another.
  • the condenser wires are individually insulated and have a common covering which is essentially oval in cross-section.
  • an electrical cable assembly comprising the steps of:
  • an electrical cable assembly comprising:
  • Figure 1 shows an extend of a conventional round conductor of the type used in accordance with the present invention.
  • Figure 2 shows schematically, the cross-sectional shape of the conductor of Figure 1.
  • Figure 3 shows, partially in section and partially schematically, a portion of a conventional flat multiconductor cable including round conductors of the type shown in Figure 1.
  • FIG. 4 shows schematically, an electrical conductor formed in accordance with the present invention.
  • Figure 5 shows, partially in section and partially schematically, a portion of an electrical cable of the present invention employing the conductor shown in Figure 4.
  • Conductor 10 is a solid round copper wire of conventional construction used to transmit electrical signals therealong.
  • Conductor 10 has a major longitudianl axis c and a circular cross-sectional shape as shown in Figure 2.
  • Typical wire sizes used in accordance with the present invention include American Wire Gage (AWG) sizes 26 through 30. Round conductors of these sizes have diameters d of between .010 inches and .016 inches. The cross-sectional areas of these conductors range between approximately 100 and 250 circular mils. Electrical resistance of a copper wire is inversely proportional to its cross-sectional area. Therefore, larger wires will have less resistance and can accordingly carry a greater amount of electrical signal therealong.
  • AMG American Wire Gage
  • Cable assembly 12 includes an electrically insulative casing 14 formed of extruded plastic such as polyvinyl chloride (PVC).
  • Casing 14 is generally flat having an upper planar surface 16 and a lower planar surface 18 substantially parallel thereto. While planar surfaces 16 and 18 are shown as flat, cable having undulating planar surfaces may also be employed. Cables of this type are commonly referred to as ribbon cables.
  • Conductors 10 are supported within casing 14 in electrical isolation. Conductors 10 are spaced from one another within casing 14 at a given pitch. Conductor pitch is defined by the distance between center line c of adjacent conductors 10. The pitch between conductors of flat ribbon cable is critical as ribbon cable is designed to be mass terminated to electrical connectors (not shown) having insulation displacing contacts fixedly supported in an insulative housing. the pitch of the cable must match the pitch of the connector. In Figure 3, the conductors are spaced at a pitch of P1. Since conductors 10 are of the round variety, the actual space between facing surfaces of adjacent conductors will be less than P1.
  • the distance between tangent points T1 and T2 of side-by-side conductors 10′ and 10 ⁇ is S1, which is substantially less than P1.
  • the impedance value of an electrical cable is determined, in part, by the special separation between facing surfaces of adjacent conductors. As a mass of insulating material increases between adjacent conductors, the impedance value of the cable will correspondingly increase. Thus, as conductor size is increased and/or the pitch between conductors is decreased, the impedance value of the cable will drop.
  • the present invention provides a technique for placing conductors at a closer pitch without either decreasing conductor size or decreasing the impedance value of the cable.
  • Conductor 20 is formed from a conventional solid round conductor such as conductor 10 shown in Figure 1.
  • the round conductor 20 is passed through flattening rollers (not shown) to form flat surfaces 21 along the length thereof.
  • the rollers are of the type conventionally used in the metallic forming art to press flat surfaces on metallic objects. Rollers capable of such function are commercially available.
  • Flat surfaces 21 may be placed on conductor 20 either simultaneously or by separate forming steps. As shown in Figure 4, flat surfaces 21 are diametrically opposed and substantially parallel to one another.
  • An important feature of the present invention is that rather than cutting a flat surface on each diametrical side of conductor 20, the conductor is actually flattened in a manner such that opposed upper and lower rounded conductor surfaces 23 and 25 are outwardly deformed from their original condition. Thus, the cross-sectional area of conductor 20 does not change during formation. This permits the conductor to carry the same amount of signal current as was possible prior to the forming steps employed in the present invention.
  • upper and lower surfaces 23, 25 also substantially maintain their rounded configuration. This facilitates the ability to mass terminate cable assembly 22 (Fig. 5) with conventional electrical connectors having insulation displacing contacts (not shown).
  • Cable assembly 22 includes insulative casing 24 similar to casing 14 shown in Figure 3.
  • Casing 24 includes upper and lower major planar surfaces 26 and 28 respectively which support therebetween conductors 20.
  • Cable assembly 22 includes conductors 20 of the type shown in Figure 4.
  • Conductors 20 are arranged within casing 24 so that flattened surfaces 21 are substantially perpendicular to major planar surfaces 26 and 28 and center lines c line in a common plane.
  • Rounded surfaces 23 and 25 face major surfaces 26 and 28 respectively.
  • Cable assembly 22 is typically formed by extruding insulative casing 24 over conductors 20.
  • the conductors 20 of cable assembly 22 are spaced at a pitch P1 which is less than P2 the pitch of cable assembly 12 (Fig. 3). Since each of conductors 20 includes flattened surfaces 21, the distance S2 between facing flattened surfaces 21 of adjacent conductors 20′ and 20 ⁇ is not correspondingly reduced. Comparing cable assembly 12 shown in Figure 3, with cable assembly 22 of the present invention shown in Figure 5, this feature is illustrated. While the conductor pitch of the cable assembly 22 of the present invention has been reduced from P1 to P2, the actual spacing between facing surfaces of adjacent conductors remains substantially the same. That is, S1 ⁇ S2.
  • the impedance value of cable assembly 22 would be substantially similar to impedance value of cable assembly 12. Also, as mentioned above, since conductors 20 maintain the same cross-sectional area as conductors 10, the signal carrying capability of cable assembly 22 is not reduced.
  • the present invention employs multiple conductors, each identically formed to have diametrically opposed flattened surfaces 21.
  • conductors 20 may be formed to have only one flattened surface.
  • only selected ones of conductors 20 may be formed to have one or more flattened surfaces. This would permit the cable assembly 22 to have selected different impedance values as between various pairs of conductors.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Insulated Conductors (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)
  • Multi-Conductor Connections (AREA)

Claims (11)

  1. Ein Verfahren zum Herstellen einer elektrischen Kabelanordnung (22), umfassend die folgenden Stufen:
    Ausbilden eines ersten langgestreckten elektrischen Leiters (20) mit einem im wesentlichen kreisrunden Querschnitt,
    Abflachen eines ersten Oberflächenabschnittes (21) des ersten Leiters (20) entlang seiner Länge,
    Ausbilden weiterer elektrischer Leiter (20),
    Anordnen des ersten Leiters (20) in einer Lage in einem Querabstand neben einem zweiten Leiter (20), wobei der abgeflachte erste Oberflächenabschnitt (21) des ersten Leiters dem zweiten Leiter zugewendet ist, und
    Ausbilden eines isolierenden Mantels (24) über den Leitern zum Placieren der Leiter in gegenseitige elektrische Isolierung, wobei der Mantel eine zu den Längsachsen der Leiter parallel liegende erste planare Hauptoberfläche (26) aufweist.
  2. Ein Verfahren nach Anspruch 1, enthaltend die Stufen des Abflachens eines zweiten Oberflächenabschnittes (21) des ersten Leiters (20) entlang seiner Länge, wobei der erste abgeflachte Oberflächenabschnitt in einem Abstand und im wesentlichen parallel zum zweiten abgeflachten Oberflächenabschnitt liegt.
  3. Ein Verfahren nach Anspruch 1 oder 2, wobei der zweite Leiter (20) im wesentlichen Kreisquerschnitt aufweist und weiter enthaltend die Stufe des Abflachens eines ersten Oberflächenabschnittes (21) des zweiten Leiters entlang seiner Länge.
  4. Ein Verfahren nach Anspruch 3, wobei diese Anordnungsstufe weiter das Anordnen des ersten und des zweiten Leiters (20) enthält, derart, daß die abgeflachten ersten Oberflächenabschnitte (21) des ersten und des zweiten Leiters einander zugekehrt sind.
  5. Ein Verfahren nach irgendeinem der Ansprüche 1 bis 4, wobei die Ausformstufe das Extrudieren des isolierenden Mantels (24) über dem ersten und dem zweiten Leiter enthält.
  6. Eine elektrische Kabelanordnung, umfassend:
    eine Vielzahl von langgestreckten elektrischen Leitern (20) und
    einen langgestreckten, elektrisch isolierenden Mantel (24), der jeden Leiter durchlaufend umschließt und diese Seite an Seite in einer elektrisch isolierenden Anordnung mit Querabstand abstützt, wobei der Mantel eine parallel zu den Leiterachsen liegende erste planare Hauptoberfläche (26) aufweist,
    wobei einer der Leiter (20) einen ersten ebenen Oberflächenabschnitt (21), der einem benachbarten Leiter zugewandt ist, und einen ersten bogenförmigen Oberflächenabschnitt (23), der der ersten planaren Hauptfläche (26) zugewandt ist, aufweist.
  7. Eine elektrische Kabelanordnung nach Anspruch 6, wobei der Mantel (24) eine zweite planare Hauptoberfläche (28) aufweist, die zu der ersten Hauptoberfläche (26) in einem Abstand liegt und im wesentlichen parallel zu dieser ist, und wobei die Leiter (20) zwischen diesen planaren Oberflächen abgestützt werden.
  8. Eine elektrische Kabelanordnung nach Anspruch 6 oder Anspruch 7, wobei der eine Leiter (20) einen zweiten ebenen Oberflächenabschnitt (21) aufweist, der in einem Abstand zum ersten ebenen Oberflächenabschnitt (21) liegt und im wesentlichen parallel zu diesem ist.
  9. Eine elektrische Kabelanordnung nach irgendeinem der Ansprüche 6 bis 8, wobei der eine Leiter (20) einen zweiten bogenförmigen Oberflächenabschnitt (25) aufweist, der der zweiten ebenen Hauptoberfläche (28) zugewandt ist.
  10. Eine elektrische Kabelanordnung nach irgendeinem der Ansprüche 6 bis 9, wobei einer der einander benachbarten Leiter einen ersten ebenen Oberflächenabschnitt (21) aufweist, der dem ebenen Oberflächenabschnitt des einen Leiters zugewandt ist.
  11. Eine elektrische Kabelanordnung wie in Anspruch 6 beansprucht, wobei jeder Leiter (20) eine erste und eine zweite zueinander parallele ebene Oberfläche (21) aufweist und ein erster und ein zweiter bogenförmiger Oberflächenabschnitt (23, 25) zwischen den ebenen Oberflächen verläuft, der Mantel einen zweiten ebenen Hauptoberflächenabschnitt (28) aufweist, der zu dem ersten ebenen Hauptoberflächenabschnitt (26) parallel liegt, und die parallelen ebenen Oberflächen (21) der Leiter zu der ersten und der zweiten planaren Oberfläche (26, 28) im wesentlichen senkrecht liegen.
EP19910308533 1990-09-19 1991-09-18 Hochohmiges elektrisches Kabel und Verfahren zur Herstellung Expired - Lifetime EP0477006B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US07/585,858 US5049215A (en) 1990-09-19 1990-09-19 Method of forming a high impedance electrical cable
US07/585,860 US5091610A (en) 1990-09-19 1990-09-19 High impedance electrical cable
US585860 1990-09-19
US585858 1990-09-19

Publications (2)

Publication Number Publication Date
EP0477006A1 EP0477006A1 (de) 1992-03-25
EP0477006B1 true EP0477006B1 (de) 1996-03-06

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Application Number Title Priority Date Filing Date
EP19910308533 Expired - Lifetime EP0477006B1 (de) 1990-09-19 1991-09-18 Hochohmiges elektrisches Kabel und Verfahren zur Herstellung

Country Status (4)

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EP (1) EP0477006B1 (de)
CA (1) CA2051505C (de)
DE (1) DE69117631T2 (de)
ES (1) ES2086494T3 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9064612B2 (en) 2010-08-31 2015-06-23 3M Innovative Properties Company Shielded electrical ribbon cable with dielectric spacing
US9105376B2 (en) 2010-08-31 2015-08-11 3M Innovative Properties Company Connector arrangements for shielded electrical cables
US11854716B2 (en) 2010-08-31 2023-12-26 3M Innovative Properties Company Shielded electrical cable

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9685259B2 (en) 2009-06-19 2017-06-20 3M Innovative Properties Company Shielded electrical cable
SG176901A1 (en) 2009-06-19 2012-01-30 3M Innovative Properties Co Shielded electrical cable
CA2809347A1 (en) 2010-08-31 2012-03-08 3M Innovative Properties Company Shielded electrical cable in twinaxial configuration
EP2522021B1 (de) 2010-08-31 2016-07-27 3M Innovative Properties Company Hochdichtes abgeschirmtes elektrokabel und andere abgeschirmte kabel, systeme und verfahren
US10147522B2 (en) 2010-08-31 2018-12-04 3M Innovative Properties Company Electrical characteristics of shielded electrical cables
CN105047269B (zh) 2010-09-23 2017-12-26 3M创新有限公司 屏蔽电缆

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB336784A (en) * 1928-10-20 1930-10-23 Siemens Ag Trunk cable with compensating condensers
FR1404549A (fr) * 1964-05-20 1965-07-02 Trefimetaux Trese métallique, sa fabrication et produits équipés de cette tresse
US3558803A (en) * 1969-08-26 1971-01-26 Revere Copper & Brass Inc Magnet strip conductor

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9064612B2 (en) 2010-08-31 2015-06-23 3M Innovative Properties Company Shielded electrical ribbon cable with dielectric spacing
US9105376B2 (en) 2010-08-31 2015-08-11 3M Innovative Properties Company Connector arrangements for shielded electrical cables
US9202608B2 (en) 2010-08-31 2015-12-01 3M Innovative Properties Company Connector arrangements for shielded electrical cables
US9202609B2 (en) 2010-08-31 2015-12-01 3M Innovative Properties Company Connector arrangements for shielded electrical cables
US9325121B2 (en) 2010-08-31 2016-04-26 3M Innovative Properties Company Connector arrangements for shielded electrical cables
US11854716B2 (en) 2010-08-31 2023-12-26 3M Innovative Properties Company Shielded electrical cable

Also Published As

Publication number Publication date
DE69117631D1 (de) 1996-04-11
CA2051505C (en) 1995-07-04
EP0477006A1 (de) 1992-03-25
DE69117631T2 (de) 1996-07-18
ES2086494T3 (es) 1996-07-01
CA2051505A1 (en) 1992-03-20

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