EP0867891A1 - Data transmission cable and its manufacturing process - Google Patents

Data transmission cable and its manufacturing process Download PDF

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Publication number
EP0867891A1
EP0867891A1 EP98400664A EP98400664A EP0867891A1 EP 0867891 A1 EP0867891 A1 EP 0867891A1 EP 98400664 A EP98400664 A EP 98400664A EP 98400664 A EP98400664 A EP 98400664A EP 0867891 A1 EP0867891 A1 EP 0867891A1
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EP
European Patent Office
Prior art keywords
tape
cable according
cable
layer
insulating layer
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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.)
Granted
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EP98400664A
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German (de)
French (fr)
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EP0867891B1 (en
Inventor
Serge Damilo
Daniel Prudhon
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.)
Nexans SA
Original Assignee
Alcatel SA
Alcatel Alsthom Compagnie Generale dElectricite
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Publication of EP0867891A1 publication Critical patent/EP0867891A1/en
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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
    • 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
    • H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
    • H01B13/26—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping
    • H01B13/2613—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping by longitudinal lapping
    • H01B13/262—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping by longitudinal lapping of an outer metallic screen

Definitions

  • the present invention relates to a cable for data transmission comprising a conductive screen to protect one or more conductor (s) against external electromagnetic disturbances.
  • Data transmission usually takes place using conductors isolated electrical devices surrounded by a screen or several metallic screens, the screen (or screens) being enclosed in a sheath.
  • the screen isolates the conductors from external electromagnetic interference. We obtains the best protection when the conductive screen is continuous, without opening. But the usual manufacturing techniques require the use of one or more ribbons to form the screen, which necessarily leads to openings which limit the effectiveness of the screen to highest frequencies.
  • patent US-4 510 346 proposes a cable comprising at least one electrical conductor surrounded by a disturbance protection screen electromagnetic at high frequencies, the screen having, arranged in length, a ribbon interior and an exterior tape each having a conductive layer covered by a insulating layer; the inner tape has its conductive layer facing outwards and the tape outside has its conductive layer facing inwards so that these layers are applied against each other; at least one of these two ribbons has longitudinal overlapping edges.
  • the present invention aims to solve this problem by providing a cable to both effective at very high frequencies, typically above 100 MHz, and easier to strip only the known effective cables at these frequencies.
  • the present invention provides for this purpose a cable comprising at least one electrical conductor surrounded by a screen for protection against electromagnetic disturbances at high frequencies, the screen comprising, arranged in length, an inner tape comprising a conductive layer and an outer tape comprising a conductive layer covered by an insulating layer, the conductive layer of the outer tape being turned inward so that the respective conductive layers of the inner and outer tapes are applied one against the other, and at least one of the two ribbons with longitudinal overlapping edges, characterized in that the insulating material of the insulating layer of the outer tape is bonded to the inner wall of an outer sheath.
  • the cable according to the invention is protected against disturbances which may approach 1 GHz.
  • the cable according to the invention is particularly simple to connect because, when the opening of the sheath, the outer tape remains glued to the latter, and the conductive layer of the interior tape remains visible alone. The connection of the cable according to the invention to a connector is therefore facilitated.
  • the area of the longitudinal edges of the inner tape is covered by a continuous area of the outer tape. This ensures good continuity screen.
  • the areas of the longitudinal edges of the two ribbons are opposite each other.
  • the inner ribbon also consists of a layer conductive covered with an insulating layer, in polyester for example.
  • the interior and exterior ribbons can slide correctly on guides during the manufacturing. In this way the risk of deterioration by friction is minimized.
  • this outer tape can be glued to the sheath.
  • the sheath material is hot extruded at a temperature sufficient for the material plastic outer tape softens and sticks to the inner surface of the sheath.
  • An electrical continuity wire can be placed between the two screens.
  • the contact between the electrical continuity wire and the metal of one of the two tapes, preferably the metal of the inner tape is improved.
  • the cable according to the invention it is possible, for example, to hot extrude the outer sheath at a temperature such that it sticks to the insulating layer of the outer tape.
  • the interior and exterior ribbons can be preformed in the same guide. In this way the two ribbons do not move one relative to the other, which avoids the friction which could be damaging between the layer conductive inner tape and the conductive layer of the outer tape.
  • the cable 10 shown in Figure 1 is intended to transport data at high debit, especially for computer applications.
  • the cable comprises two quads 12 and 14, each quarter being formed by a set of four insulated conductors, for example 12 1 , 12 2 , 12 3 and 12 4 for the quarter 12.
  • a screen protecting the conductors against external disturbance which is formed by two ribbons, one of which, 18, surrounds the other, 16.
  • Each ribbon has two layers, namely a 25 ⁇ m aluminum layer thick and a 1 2 ⁇ m thick polyester layer.
  • the polyester layer 20 of the inner tape 16 is turned inward, i.e. towards quarters 12 and 14, while the conductive layer 22 of this same tape interior 1 6 faces outward.
  • the inner ribbon 16 is arranged lengthwise, that is to say that its longitudinal edges 24 and 26 are along the length of the cable and the longitudinal edges 24 1 and 26 1 of the ribbon, which end in said longitudinal edges 24 and 26, overlap and remain on one side of the cable.
  • the outer ribbon 18 of constitution and dimensions identical to those of the ribbon 16. However, its polyester layer 30 is facing outward, and its conductive layer 32 is therefore facing inward.
  • the ribbon 18 is, like the inner ribbon 16, arranged lengthwise, with longitudinal edges 34 1 and 36 1 overlapped opposite the overlapped edges 24 1 and 26 1 of the inner ribbon 16.
  • a continuity wire or conductor 40 is disposed between the interior ribbons and outside.
  • the layer 30 of polyester, facing outwards, of the tape outside 18 is bonded to the internal face of the sheath 42. This bonding is carried out during extrusion of the sheath. The extrusion is carried out at a temperature high enough to that the polyester 30 of the outer tape 18 softens and thus sticks to the sheath 42.
  • the sheath 42 When it is desired to connect the cable to a connector, the sheath 42 is removed. the corresponding end. The inner ribbon 16 then remains only visible. His diaper conductive 22, facing outward, allows easy connection.
  • the two tapes 16 and 18 are preformed by the same guides (not shown).
  • FIG. 2 is a diagram on which the frequencies F, in MHz, have been plotted on the abscissa and the transfer impedance Z of the cable is plotted on the ordinate.
  • the cable performance is all the better when the impedance Z is low.
  • impedance Z represented by curve 50, presents a minimum 52 for 80 MHz approximately and that its value is satisfactory throughout the measurement range, i.e. up to 500 MHz approximately.

Abstract

A data transmission cable consists of at least one electrical conductor (12, 14) surrounded by a screen to protect from high frequency electromagnetic interference. The screen consists of an inner strip (16) with a layer (22) of a conducting material, and an outer strip (18) with a conducting layer (32) covered by an insulating layer (30). The conducting layer of the outer strip (18) faces inwards, so that the conducting layers of the two strips are applied against one another, and at least one of the two strips has overlapping edges. The insulating layer of the outer strip is stuck to the inner surface of the cable's outer sleeve (42). The adhesion is carried out during extrusion of the outer sleeve, when the polyester insulating layer of the outer strip is softened sufficiently for it to adhere to the inner surface of the sleeve. Also claimed is a method of manufacturing the cable. The cable is efficient at very high frequencies, typically above 100 MHz, and is protected at up to at least 500 MHz.

Description

La présente invention est relative à un câble pour la transmission de données comprenant un écran conducteur pour protéger un, ou plusieurs, conducteur(s) contre des perturbations électromagnétiques extérieures.The present invention relates to a cable for data transmission comprising a conductive screen to protect one or more conductor (s) against external electromagnetic disturbances.

La transmission de données s'effectue habituellement à l'aide de conducteurs électriques isolés entourés par un écran ou plusieurs écrans métalliques, l'écran (ou les écrans) étant enfermé(s) dans une gaine.Data transmission usually takes place using conductors isolated electrical devices surrounded by a screen or several metallic screens, the screen (or screens) being enclosed in a sheath.

L'écran isole les conducteurs des perturbations électromagnétiques extérieures. On obtient la meilleure protection quand l'écran conducteur est continu, sans ouverture. Mais les techniques usuelles de fabrication obligent à utiliser un ou plusieurs rubans pour former l'écran, ce qui entraíne nécessairement des ouvertures qui limitent l'efficacité de l'écran aux fréquences les plus élevées.The screen isolates the conductors from external electromagnetic interference. We obtains the best protection when the conductive screen is continuous, without opening. But the usual manufacturing techniques require the use of one or more ribbons to form the screen, which necessarily leads to openings which limit the effectiveness of the screen to highest frequencies.

Les meilleurs écrans protègent de façon efficace jusqu'à des fréquences de l'ordre de 30 à 40 Mhz. Jusqu'à présent les meilleurs résultats sont obtenus à l'aide d'un ruban métallique disposé en long dont les bords longitudinaux se recouvrent. Un ruban en long donne de meilleurs résultats qu'un ruban disposé en hélice car la longueur sur laquelle s'étend l'ouverture est plus faible.The best screens effectively protect up to frequencies of the order of 30 to 40 Mhz. So far the best results are achieved using a ribbon metal arranged in length whose longitudinal edges overlap. A long ribbon gives better results than a ribbon arranged in a helix because the length over which extends the opening is smaller.

L'augmentation des débits d'information dans les câbles amène à augmenter la fréquence limite en deçà de laquelle les câbles sont protégés vis-à-vis de l'extérieur.The increase in information rates in cables leads to an increase in the limit frequency below which the cables are protected from the outside.

Ainsi, le brevet US-4 510 346 propose un câble comportant au moins un conducteur électrique entouré par un écran de protection contre les perturbations électromagnétiques à hautes fréquences, l'écran comportant, disposés en long, un ruban intérieur et un ruban extérieur présentant chacun une couche conductrice recouverte par une couche isolante ; le ruban intérieur a sa couche conductrice tournée vers l'extérieur et le ruban extérieur a sa couche conductrice tournée vers l'intérieur de manière que ces couches conductrices soient appliquées l'une contre l'autre ; au moins l'un de ces deux rubans présente des bords longitudinaux en recouvrement.Thus, patent US-4 510 346 proposes a cable comprising at least one electrical conductor surrounded by a disturbance protection screen electromagnetic at high frequencies, the screen having, arranged in length, a ribbon interior and an exterior tape each having a conductive layer covered by a insulating layer; the inner tape has its conductive layer facing outwards and the tape outside has its conductive layer facing inwards so that these layers are applied against each other; at least one of these two ribbons has longitudinal overlapping edges.

Si l'écran d'un tel câble protège efficacement des perturbations électromagnétiques jusqu'à des fréquences très élevées (au moins 100 Mhz), il pose néanmoins un problème majeur qui est celui de la dénudabilité. On comprend bien en effet que le ruban extérieur, posé en long, avec sa couche conductrice vers l'inférieur contre la couche conductrice du ruban intérieur empêche d'accéder facilement à la partie conductrice de l'écran et donc rend le raccordement du câble délicat à réaliser. If the screen of such a cable effectively protects against electromagnetic interference up to very high frequencies (at least 100 MHz), it nevertheless poses a problem major which is that of denudability. It is indeed well understood that the outer ribbon, laid lengthwise, with its conductive layer towards the bottom against the conductive layer of the inner tape prevents easy access to the conductive part of the screen and therefore makes the delicate cable connection to be made.

La présente invention a pour but de résoudre ce problème en proposant un câble à la fois efficace aux très hautes fréquences, typiquement supérieures à 100 Mhz , et plus facile à dénuder que les câbles connus efficaces à ces fréquences.The present invention aims to solve this problem by providing a cable to both effective at very high frequencies, typically above 100 MHz, and easier to strip only the known effective cables at these frequencies.

La présente invention propose à cet effet un câble comportant au moins un conducteur électrique entouré par un écran de protection contre les perturbations électromagnétiques à hautes fréquences, l'écran comportant, disposés en long, un ruban intérieur comprenant une couche conductrice et un ruban extérieur comprenant une couche conductrice recouverte par une couche isolante, la couche conductrice du ruban extérieur étant tournée vers l'intérieur de sorte que les couches conductrices respectives des rubans intérieur et extérieur soient appliquées l'une contre l'autre, et au moins l'un des deux rubans présentant des bords longitudinaux en recouvrement,
   caractérisé en ce que la matière isolante de la couche isolante du ruban extérieur est collée à la paroi intérieure d'une gaine externe.The present invention provides for this purpose a cable comprising at least one electrical conductor surrounded by a screen for protection against electromagnetic disturbances at high frequencies, the screen comprising, arranged in length, an inner tape comprising a conductive layer and an outer tape comprising a conductive layer covered by an insulating layer, the conductive layer of the outer tape being turned inward so that the respective conductive layers of the inner and outer tapes are applied one against the other, and at least one of the two ribbons with longitudinal overlapping edges,
characterized in that the insulating material of the insulating layer of the outer tape is bonded to the inner wall of an outer sheath.

Le câble selon l'invention est protégé contre des perturbations pouvant approcher 1 GHz. De plus, le câble selon l'invention est particulièrement simple à connecter car, lors de l'ouverture de la gaine, le ruban extérieur reste collé à cette dernière, et la couche conductrice du ruban intérieur reste seul apparente. Le raccordement du câble selon l'invention à un connecteur est donc facilité.The cable according to the invention is protected against disturbances which may approach 1 GHz. In addition, the cable according to the invention is particularly simple to connect because, when the opening of the sheath, the outer tape remains glued to the latter, and the conductive layer of the interior tape remains visible alone. The connection of the cable according to the invention to a connector is therefore facilitated.

Avantageusement, la zone des bords longitudinaux du ruban intérieur est recouverte par une zone continue du ruban extérieur. Ceci permet d'assurer une bonne continuité électrique de l'écran. De préférence dans ce cas, les zones des bords longitudinaux des deux rubans sont à l'opposé l'une de l'autre.Advantageously, the area of the longitudinal edges of the inner tape is covered by a continuous area of the outer tape. This ensures good continuity screen. Preferably in this case, the areas of the longitudinal edges of the two ribbons are opposite each other.

Il est préférable que le ruban intérieur soit également constitué par une couche conductrice recouverte d'une couche isolante, en polyester par exemple. De cette manière les rubans intérieur et extérieur peuvent coulisser correctement sur des guides au cours de la fabrication. De cette manière le risque de détérioration par le frottement est minimisé.It is preferable that the inner ribbon also consists of a layer conductive covered with an insulating layer, in polyester for example. In this way the interior and exterior ribbons can slide correctly on guides during the manufacturing. In this way the risk of deterioration by friction is minimized.

En outre ce ruban extérieur peut être collé à la gaine. A cet effet, dans un exemple, le matériau de la gaine est extrudé à chaud à une température suffisante pour que la matière plastique du ruban extérieur se ramollisse et colle à la surface intérieure de la gaine.In addition, this outer tape can be glued to the sheath. To this end, in an example, the sheath material is hot extruded at a temperature sufficient for the material plastic outer tape softens and sticks to the inner surface of the sheath.

Un fil de continuité électrique peut être disposé entre les deux écrans. De cette manière le contact entre le fil de continuité électrique et le métal de l'un des deux rubans, de préférence le métal du ruban intérieur, est amélioré. On a aussi constaté une amélioration de la protection contre les perturbations à basse fréquence.An electrical continuity wire can be placed between the two screens. Of this way the contact between the electrical continuity wire and the metal of one of the two tapes, preferably the metal of the inner tape is improved. There has also been an improvement in protection against low frequency disturbances.

Pour réaliser le câble selon l'invention, on peut par exemple extruder à chaud la gaine extérieure à une température telle qu'elle colle à la couche isolante du ruban extérieur. To make the cable according to the invention, it is possible, for example, to hot extrude the outer sheath at a temperature such that it sticks to the insulating layer of the outer tape.

Par ailleurs, on peut effectuer le préformage des rubans intérieur et extérieur dans un même guide. De cette manière les deux rubans ne se déplacent pas l'un par rapport à l'autre, ce qui évite les frottements qui pourraient être dommageables entre la couche conductrice du ruban intérieur et la couche conductrice du ruban extérieur.In addition, the interior and exterior ribbons can be preformed in the same guide. In this way the two ribbons do not move one relative to the other, which avoids the friction which could be damaging between the layer conductive inner tape and the conductive layer of the outer tape.

D'autres caractéristiques et avantages de l'invention apparaítront avec la description de certains de ses modes de réalisation, celle-ci étant effectuée en se référant aux dessins ci-annexés sur lesquels :

  • la figure 1 est une vue en coupe schématique d'un câble conforme à l'invention, et
  • la figure 2 est un diagramme montrant l'effet de l'invention.
Other characteristics and advantages of the invention will appear with the description of some of its embodiments, this being carried out with reference to the attached drawings in which:
  • FIG. 1 is a schematic sectional view of a cable according to the invention, and
  • Figure 2 is a diagram showing the effect of the invention.

Le câble 10 représenté sur la figure 1 est destiné à transporter des données à haut débit, notamment pour les applications informatiques.The cable 10 shown in Figure 1 is intended to transport data at high debit, especially for computer applications.

Dans cet exemple le câble comporte deux quartes 12 et 14, chaque quarte étant formée par un ensemble de quatre conducteurs isolés, par exemple 121, 122, 123 et 124 pour la quarte 12.In this example, the cable comprises two quads 12 and 14, each quarter being formed by a set of four insulated conductors, for example 12 1 , 12 2 , 12 3 and 12 4 for the quarter 12.

Selon l'invention on prévoit un écran protégeant les conducteurs contre les perturbations extérieures qui est formé de deux rubans, dont l'un, 18, entoure l'autre, 16.According to the invention there is provided a screen protecting the conductors against external disturbance which is formed by two ribbons, one of which, 18, surrounds the other, 16.

Chaque ruban a deux couches, à savoir une couche d'aluminium de 25 µm d'épaisseur et une couche de polyester de 1 2 µm d'épaisseur.Each ribbon has two layers, namely a 25 µm aluminum layer thick and a 1 2 µm thick polyester layer.

La couche 20 de polyester du ruban intérieur 16 est tournée vers l'intérieur, c'est-à-dire vers les quartes 12 et 14, tandis que la couche conductrice 22 de ce même ruban intérieur 1 6 est tournée vers l'extérieur.The polyester layer 20 of the inner tape 16 is turned inward, i.e. towards quarters 12 and 14, while the conductive layer 22 of this same tape interior 1 6 faces outward.

Le ruban intérieur 16 est disposé en long, c'est-à-dire que ses arêtes longitudinales 24 et 26 sont selon la longueur du câble et les bords longitudinaux 241 et 261 du ruban, qui se terminent par lesdites arêtes longitudinales 24 et 26, se recouvrent et restent d'un côté du câble.The inner ribbon 16 is arranged lengthwise, that is to say that its longitudinal edges 24 and 26 are along the length of the cable and the longitudinal edges 24 1 and 26 1 of the ribbon, which end in said longitudinal edges 24 and 26, overlap and remain on one side of the cable.

Autour du ruban 16 est disposé le ruban extérieur 18 de constitution et de dimensions identiques à celles du ruban 16. Cependant, sa couche 30 en polyester est tournée vers l'extérieur, et sa couche conductrice 32 est donc tournée vers l'intérieur. Le ruban 18 est, comme le ruban intérieur 16, disposé en long, avec des bords longitudinaux 341 et 361 en recouvrement à l'opposé des bords en recouvrements 241 et 261 du ruban intérieur 16.Around the ribbon 16 is arranged the outer ribbon 18 of constitution and dimensions identical to those of the ribbon 16. However, its polyester layer 30 is facing outward, and its conductive layer 32 is therefore facing inward. The ribbon 18 is, like the inner ribbon 16, arranged lengthwise, with longitudinal edges 34 1 and 36 1 overlapped opposite the overlapped edges 24 1 and 26 1 of the inner ribbon 16.

Un fil ou conducteur de continuité 40 est disposé entre les rubans intérieur et extérieur.A continuity wire or conductor 40 is disposed between the interior ribbons and outside.

Enfin l'ensemble est entouré par une gaine 42.Finally, the assembly is surrounded by a sheath 42.

Selon l'invention, la couche 30 de polyester, tournée vers l'extérieur, du ruban extérieur 18 est collée à la face interne de la gaine 42. Ce collage est effectué lors de l'extrusion de la gaine. L'extrusion est effectuée à une température suffisamment élevée pour que le polyester 30 du ruban extérieur 18 se ramollisse et colle ainsi à la gaine 42.According to the invention, the layer 30 of polyester, facing outwards, of the tape outside 18 is bonded to the internal face of the sheath 42. This bonding is carried out during extrusion of the sheath. The extrusion is carried out at a temperature high enough to that the polyester 30 of the outer tape 18 softens and thus sticks to the sheath 42.

Lorsque l'on désire raccorder le câble à un connecteur on enlève la gaine 42 à l'extrémité correspondante. Le ruban intérieur 16 reste alors seul apparent. Sa couche conductrice 22, tournée vers l'extérieur, permet un raccordement aisé.When it is desired to connect the cable to a connector, the sheath 42 is removed. the corresponding end. The inner ribbon 16 then remains only visible. His diaper conductive 22, facing outward, allows easy connection.

Pour la fabrication du câble les deux rubans 16 et 18 sont préformés par les mêmes guides (non montrés).For the manufacture of the cable the two tapes 16 and 18 are preformed by the same guides (not shown).

Par ailleurs, au cours de la fabrication, avant le collage, ce sont les faces en polyester des rubans qui sont en contact avec les guides. De cette manière le risque de détérioration par le frottement est minimisé.Furthermore, during manufacture, before bonding, these are the faces in polyester ribbons that are in contact with the guides. In this way the risk of deterioration by friction is minimized.

Le contact de la couche conductrice 32 du ruban extérieur contre la couche conductrice 22 du ruban intérieur minimise le risque d'apparition d'ouverture pour les perturbations électromagnétiques extérieures. Les positions opposées des bords en recouvrement sont aussi particulièrement favorables à la minimisation des perturbations. Pour cette raison, il est préférable que la zone des bords longitudinaux en recouvrement, 241 et 261, du ruban intérieur 16 soit recouverte par une zone continue 44 du ruban extérieur.Contact of the conductive layer 32 of the outer tape against the conductive layer 22 of the inner tape minimizes the risk of the appearance of an opening for external electromagnetic disturbances. The opposite positions of the overlapping edges are also particularly favorable for minimizing disturbances. For this reason, it is preferable that the area of the longitudinal overlapping edges, 24 1 and 26 1 , of the inner tape 16 is covered by a continuous area 44 of the outer tape.

La figure 2 est un diagramme sur lequel les fréquences F, en MHz, ont été portées en abscisses et l'impédance de transfert Z du câble est portée en ordonnées. Les performances du câble sont d'autant meilleures que l'impédance Z est faible. On voit que l'impédance Z, représentée par la courbe 50, présente un minimum 52 pour 80 MHz environ et que sa valeur est satisfaisante dans toute la gamme de mesure, c'est-à-dire jusqu'à 500 MHz environ.FIG. 2 is a diagram on which the frequencies F, in MHz, have been plotted on the abscissa and the transfer impedance Z of the cable is plotted on the ordinate. The cable performance is all the better when the impedance Z is low. We see that impedance Z, represented by curve 50, presents a minimum 52 for 80 MHz approximately and that its value is satisfactory throughout the measurement range, i.e. up to 500 MHz approximately.

Claims (10)

Câble comportant au moins un conducteur électrique (12, 14) entouré par un écran de protection contre les perturbations électromagnétiques à hautes fréquences, l'écran comportant, disposés en long, un ruban intérieur (16) comprenant une couche conductrice (22) et un ruban extérieur (18) comprenant une couche conductrice (32) recouverte par une couche isolante (30), la couche conductrice (32) du ruban extérieur (18) étant tournée vers l'intérieur de sorte que les couches conductrices (22, 32) respectives des rubans intérieur (16) et extérieur (18) soient appliquées l'une contre l'autre, et au moins l'un des deux rubans présentant des bords longitudinaux en recouvrement,
caractérisé en ce que la matière isolante de la couche isolante (30) du ruban extérieur (18) est collée à la paroi intérieure d'une gaine externe (42).Cable comprising at least one electrical conductor (12, 14) surrounded by a screen for protection against high-frequency electromagnetic interference, the screen comprising, arranged in length, an inner strip (16) comprising a conductive layer (22) and a outer tape (18) comprising a conductive layer (32) covered by an insulating layer (30), the conductive layer (32) of the outer tape (18) being turned inward so that the conductive layers (22, 32) respective of the interior (16) and exterior (18) ribbons are applied one against the other, and at least one of the two ribbons having longitudinal overlapping edges,
characterized in that the insulating material of the insulating layer (30) of the outer tape (18) is bonded to the inner wall of an outer sheath (42). Câble selon la revendication 1, caractérisé en ce que la zone des bords longitudinaux (241, 261) du ruban intérieur (16) est recouverte par une zone continue (44) du ruban extérieur (18).Cable according to claim 1, characterized in that the area of the longitudinal edges (24 1 , 26 1 ) of the inner tape (16) is covered by a continuous area (44) of the outer tape (18). Câble selon la revendication 2, caractérisé en ce que la zone des bords longitudinaux (241, 261) du ruban intérieur est à l'opposé de la zone des bords longitudinaux (341, 361) du ruban extérieur.Cable according to claim 2, characterized in that the area of the longitudinal edges (24 1 , 26 1 ) of the inner tape is opposite the area of the longitudinal edges (34 1 , 36 1 ) of the outer tape. Câble selon l'une quelconque des revendications précédentes, caractérisé en ce que les couches conductrices (22, 32) des rubans (16, 18) sont à base d'aluminium.Cable according to any one of the preceding claims, characterized in that the conductive layers (22, 32) of the ribbons (16, 18) are based on aluminum. Câble selon l'une quelconque des revendications précédentes, caractérisé en ce que le ruban intérieur (16) comporte une couche isolante (20), par exemple en polyester, recouvrant ladite couche conductrice (22).Cable according to any one of the preceding claims, characterized in that the inner tape (16) has an insulating layer (20), for example polyester, covering said conductive layer (22). Câble selon l'une des revendications précédentes, caractérisé en ce que la couche isolante (30) du ruban extérieur (18) est en polyester.Cable according to one of the preceding claims, characterized in that the layer the insulating tape (30) of the outer tape (18) is made of polyester. Câble selon l'une quelconque des revendications précédentes, caractérisé en ce que le ruban intérieur et le ruban extérieur ont une constitution et des dimensions sensiblement identiques.Cable according to any one of the preceding claims, characterized in that the inner tape and the outer tape have a constitution and dimensions substantially identical. Câble selon l'une quelconque des revendications précédentes, caractérisé en ce qu'un fil conducteur de continuité (40) est disposé entre les deux rubans (16, 18).Cable according to any one of the preceding claims, characterized in that a wire continuity conductor (40) is disposed between the two tapes (16, 18). Procédé de fabrication d'un câble selon l'une quelconque des revendications précédentes, caractérisé en ce que la gaine extérieure (42) est réalisée par extrusion à chaud à une température telle qu'elle colle à la couche isolante du ruban extérieur (18). Method of manufacturing a cable according to any one of the claims above, characterized in that the outer sheath (42) is produced by extrusion at hot to a temperature such that it sticks to the insulating layer of the outer tape (18). Procédé de fabrication d'un câble selon l'une quelconque des revendications précédentes, caractérisé en ce que le préformage des rubans intérieur (16) et extérieur (18) est effectué dans un même guide.Method of manufacturing a cable according to any one of the claims previous, characterized in that the preforming of the interior (16) and exterior ribbons (18) is carried out in the same guide.
EP98400664A 1997-03-27 1998-03-23 Data transmission cable and its manufacturing process Expired - Lifetime EP0867891B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9703751 1997-03-27
FR9703751A FR2761515B1 (en) 1997-03-27 1997-03-27 CABLE FOR DATA TRANSMISSION AND MANUFACTURING METHOD THEREOF

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EP0867891A1 true EP0867891A1 (en) 1998-09-30
EP0867891B1 EP0867891B1 (en) 2002-07-03

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EP (1) EP0867891B1 (en)
DE (1) DE69806295T2 (en)
FR (1) FR2761515B1 (en)

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Also Published As

Publication number Publication date
FR2761515B1 (en) 1999-04-30
DE69806295T2 (en) 2002-11-28
US6259019B1 (en) 2001-07-10
DE69806295D1 (en) 2002-08-08
EP0867891B1 (en) 2002-07-03
FR2761515A1 (en) 1998-10-02

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