EP1158542A1 - Flexible coaxial cable and its manufacturing method - Google Patents

Flexible coaxial cable and its manufacturing method Download PDF

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Publication number
EP1158542A1
EP1158542A1 EP01401370A EP01401370A EP1158542A1 EP 1158542 A1 EP1158542 A1 EP 1158542A1 EP 01401370 A EP01401370 A EP 01401370A EP 01401370 A EP01401370 A EP 01401370A EP 1158542 A1 EP1158542 A1 EP 1158542A1
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EP
European Patent Office
Prior art keywords
cable
ribbon
windings
screen
insulation
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Granted
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EP01401370A
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German (de)
French (fr)
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EP1158542B1 (en
Inventor
Pascal Clouet
Jean-Francois Guinot
Jean-Jacques Maisseu
Francois Vaille
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Nexans SA
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Nexans SA
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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
    • H01B11/18—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
    • H01B11/1808—Construction of the conductors
    • H01B11/183—Co-axial cables with at least one helicoidally wound tape-conductor

Definitions

  • the present invention relates to flexible coaxial cables and more particularly those of small section, which can be used in particular in medical imaging, or on portable transmission equipment such as than computers, or for microwave transmissions.
  • GB-A-2 130 430 discloses a flexible coaxial cable, which has a flexible conductive core, flexible insulation around said core, a conductive screen also flexible around said insulation and a possible flexible protective outer sheath.
  • the screen of this cable is consisting of an internal metal strip, which is folded longitudinally around the insulation, an external metal tape, which is wrapped helically around the internal ribbon, and a possible metallic braid, which is then mounted around the outer tape and provided to allow make a connection to the screen at the ends of the cable.
  • Each of the ribbons can be made of a single metal or be made of composite material by example in tinned copper or plastic / metal laminate.
  • the external ribbon is used to cover cracks or cracks, which may appear in the tape internal under the effect of kinks / folds in the cable. Its windings have however, they themselves tend to move during these folds / unfoldings of the cable, which changes the contact resistance and the geometry assembly of the windings between them and on the internal tape, leading to a helical current path in this outer ribbon and limiting the performance of the screen,
  • EP-A-0 236 096 also discloses a coaxial cable flexible, which avoids the drawbacks of the cable known from the aforementioned document and has for this purpose a screen comprising a copper ribbon laid longitudinally or helically wrapped around the insulation having overlapping edges, a copper braid around this ribbon and a layer of metal closing the opening along the overlapping edges of said ribbon and the interstices of the braid and joining the braid and said ribbon, so that the screen is flexible and without openings.
  • the coaxial cable thus obtained is flexible while having a screen efficient.
  • the metal layer between the braid and the ribbon is not no uniform thickness all around the cable, due to its fluidity in the state molten.
  • the manufacturing process for such a screen is long and little dresser. As indicated in this document, it cannot be carried out in continuous online, due to the very different speeds of setting up its different parts.
  • the installation of the braid being much slower than that of other parties.
  • a braid tight is advantageous for a good possible obturation of its interstices by molten metal, on the other hand it makes a good and more difficult and uncertain flow of molten metal through it for its binding to the ribbon and the closing the opening line of the edges of the ribbon.
  • the use of a molten tin bath requires safety devices to avoid risk of burns and inhalation of vapors.
  • the object of the present invention is to produce a flexible coaxial cable having a reliable screen structure leading to excellent performance and stable over time and allowing a manufacturing process particularly simple and fast.
  • a flexible coaxial cable comprising a core flexible conductive, flexible insulation around said core and a screen flexible metal around said insulation, said screen comprising a first metal strip provided with a metal coating on at least one side of it and helically wrapped around said insulation in having successive windings overlapping in a zone of continuous helical overlap along said cable, is characterized in that that said first ribbon is tightly closed on itself in all of said overlap area of said windings by said coating welding said windings to each other.
  • a flexible coaxial cable having a flexible conductive core, flexible insulation around said core and a flexible metal screen around said insulation, said screen comprising a first metallic ribbon and a second ribbon metallic exterior wound helically around said insulation and provided at least for one of them with a metallic coating on at at least one side thereof
  • each of said ribbons has windings with continuous helical junction along said cable, in that the windings of said second ribbon completely cover the backing of the first ribbon and partially the windings of said first ribbon, and in that the overlap zones of the windings of said ribbons are sealed by said coating provided on the minus one of the two opposite faces of said ribbons.
  • the invention also relates to a method for manufacturing said cable, characterized in that it consists in subjecting the cable provided with said screen to a peripheral heating of welding of the windings of each ribbon composing said screen, without external input of solder material.
  • the peripheral welding heating is provided. by a high frequency induction winding, mounted on a continuous production line of said screen.
  • the cable has a conductive core flexible 1, flexible insulation 2 covering said core and a flexible screen 3 surrounding said insulation.
  • This flexible screen 3 is constituted by a metal strip 4, which is provided with a metallic coating 5 on at least its outer face, is wrapped helically around the insulation, having its windings overlapping widely, and is tightly closed on itself by said coating welding said windings to each other throughout their overlapping area.
  • the overlap noted 6 of the windings is illustrated by 50%. In practical it may be less, being however at least 20 to 25% and preferably around 40%. It defines the overlap area welded, without any external material, which is helical and continues the along the cable for perfect sealing and conservation of performance of the screen 3 thus formed.
  • the conductive core 1 is a solid core single conductor or a stranded stranded core, for example of bare copper, tinned, silver or copper alloy or steel coated with copper.
  • the insulation is a conventional or expanded dielectric, such as PTFE, FEP, PFA, PE or PP.
  • the screen 4 is preferably produced by a ribbon of tinned copper, the tin coating of which is melted for soldering direct from its windings to each other throughout their area of overlap.
  • the ribbon 4 can be tinned on both sides.
  • This cable is advantageously a coaxial cable of diameter over insulation 2 between 0.2 and 8 mm.
  • the ribbon used 4 has a width of 0.2 to 15 mm and has a winding pitch of 0.12 to 10 mm, depending on the insulation diameter.
  • the cable can of course be provided with an outer sheath of protection, which is optional and not shown.
  • the tape 14 is advantageously constituted by a laminated tape plastic / metal with the plastic side against the insulation 2.
  • the tapes 16 and 18 are advantageously constituted by metal ribbons, for example made of copper, and provided with metallic coating layers 17 and 19, by example of tin or tin-based or, at least on their inner side.
  • Ribbons 16 and 18 are wound in the same direction and at the same not, being offset relative to each other by around 1 ⁇ 4 to 3 ⁇ 4 of the value of the winding step. They are welded to each other and to the tape 14 by coatings 17 and 19.
  • each of the two helical bands 16 and 18 has its windings largely overlapping.
  • the inner longitudinal strip 14 is optional.
  • each of the helical bands 16 and 18 has a 16 'and 18' gap between its windings, this gap being continuous along the cable.
  • the outermost helical ribbon windings 18 overlap totally the gap 16 'of the ribbon 16 and partially the windings of this one.
  • the longitudinal strip 14 is optional in the cable screen.
  • the cable of Figure 2 or 3 may also have a sheath protective exterior, not shown. Its dimensions and the pitch of its helical ribbons are as defined for the cable Figure 1.
  • the cable may include a longitudinal tape (such as tape 14 in Figure 2 or 3) under the tape helical 4, the latter then being provided with an internal metallic coating and optionally of the exterior metallic coating 5.
  • a longitudinal tape such as tape 14 in Figure 2 or 3
  • the latter then being provided with an internal metallic coating and optionally of the exterior metallic coating 5.
  • FIG. 4 The process for continuously producing screen 3 on the core online conductor 1 provided with its insulation 2 is illustrated in FIG. 4.
  • the core insulated conductor noted by references 1 and 2 is taken from a coil storage 20 and passes through a tape station 22, which receives the tape 4 provided with its coating 5.
  • This ribbon is taken from a roller 21 and is helically wrapped around the insulated core, as described opposite Figure 1.
  • the cable with this ribbon then passes through a station 23 of soldering the ribbon windings to each other, in which the welding is carried out, without external input of welding material, directly by the coating 5.
  • This soldering station comprises at this effect an induction coil 24 supplied at high frequency, which ensures the fusion of the coating 5 and the resulting weld of the windings to others.
  • the cable provided with its screen 3 thus tightly closed is stored on a take-up reel 25.

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  • Communication Cables (AREA)
  • Insulated Conductors (AREA)
  • Manufacturing Of Electric Cables (AREA)

Abstract

A flexible coaxial cable includes a shield formed by at least one metal tape provided with a metal coating and wound helically around the insulated core of the cable. The shield is sealed to itself in leakproof manner by the coating which is melted so as to bond directly together the overlapping turns of a single tape or the overlapping turns of two superposed tapes by subjecting the cable provided with the shield to peripheral induction heating.

Description

La présente invention se rapporte aux câbles coaxiaux flexibles et plus particulièrement ceux de faible section, qui sont utilisables notamment en imagerie médicale, ou sur des équipements portables de transmission tels que des ordinateurs, ou pour des transmissions micro-ondes.The present invention relates to flexible coaxial cables and more particularly those of small section, which can be used in particular in medical imaging, or on portable transmission equipment such as than computers, or for microwave transmissions.

L'une des exigences à satisfaire est que le conducteur extérieur ou écran d'un tel câble soit et reste parfaitement efficace alors que le câble et donc cet écran sont flexibles.One of the requirements to be met is that the outside conductor or screen of such a cable is and remains perfectly effective while the cable and so this screen are flexible.

Le document GB-A- 2 130 430 divulgue un câble coaxial flexible, qui comporte une âme conductrice flexible, une isolation flexible autour de ladite âme, un écran conducteur également flexible autour de ladite isolation et une possible gaine extérieure flexible de protection. L'écran de ce câble est constitué par un ruban métallique interne, qui est plié longitudinalement autour de l'isolation, un ruban métallique externe, qui est enroulé hélicoïdalement autour du ruban interne, et une éventuelle tresse métallique, qui est alors montée autour du ruban externe et prévue pour permettre de réaliser une connexion à l'écran aux extrémités du câble. Les bords du ruban interne se chevauchent ou sont soudés le long du câble et ceux du ruban externe se chevauchent largement d'un enroulement au suivant. Chacun des rubans peut être en un seul métal ou être en matériau composite par exemple en cuivre étamé ou en laminé plastique/métal.GB-A-2 130 430 discloses a flexible coaxial cable, which has a flexible conductive core, flexible insulation around said core, a conductive screen also flexible around said insulation and a possible flexible protective outer sheath. The screen of this cable is consisting of an internal metal strip, which is folded longitudinally around the insulation, an external metal tape, which is wrapped helically around the internal ribbon, and a possible metallic braid, which is then mounted around the outer tape and provided to allow make a connection to the screen at the ends of the cable. The edges of the ribbon internal overlap or are soldered along the cable and those of the ribbon external overlap widely from one winding to the next. Each of the ribbons can be made of a single metal or be made of composite material by example in tinned copper or plastic / metal laminate.

Dans ce câble ainsi connu, le ruban externe sert à recouvrir des craquelures ou fissures, qui sont susceptibles d'apparaítre dans le ruban interne sous l'effet de pliures/dépliures du câble. Ses enroulements ont cependant eux-mêmes tendance à se déplacer lors de ces pliures/dépliures du câble, ce qui modifie la résistance de contact et la géométrie d'assemblage des enroulements entre-eux et sur le ruban interne, en conduisant à une trajectoire hélicoïdale de courant dans ce ruban externe et limitant alors les performances de l'écran,In this cable thus known, the external ribbon is used to cover cracks or cracks, which may appear in the tape internal under the effect of kinks / folds in the cable. Its windings have however, they themselves tend to move during these folds / unfoldings of the cable, which changes the contact resistance and the geometry assembly of the windings between them and on the internal tape, leading to a helical current path in this outer ribbon and limiting the performance of the screen,

Le document EP-A- 0 236 096 divulgue également un câble coaxial flexible, qui évite les inconvénients du câble connu par le document précité et a à cet effet un écran comportant un ruban de cuivre posé longitudinalement ou enroulé hélicoïdalement autour de l'isolation en ayant des bords se chevauchant, une tresse de cuivre autour de ce ruban et une couche de métal venant fermer l'ouverture le long des bords se chevauchant dudit ruban et les interstices de la tresse et venant solidariser la tresse et ledit ruban, de sorte que l'écran soit flexible et sans ouvertures.EP-A-0 236 096 also discloses a coaxial cable flexible, which avoids the drawbacks of the cable known from the aforementioned document and has for this purpose a screen comprising a copper ribbon laid longitudinally or helically wrapped around the insulation having overlapping edges, a copper braid around this ribbon and a layer of metal closing the opening along the overlapping edges of said ribbon and the interstices of the braid and joining the braid and said ribbon, so that the screen is flexible and without openings.

Pour la fabrication d'un tel câble, après la mise en place de l'écran et de la tresse, on fait passer le câble dans un bain de métal fondu, en l'occurrence d'étain. Pendant l'application de ce métal fondu, le ruban joue le rôle d'écran thermique pour isoler thermiquement l'isolation du métal fondu, alors qu'en l'absence du ruban le métal fondu viendrait directement en contact avec l'isolation et pourrait la dégrader.For the manufacture of such a cable, after the installation of the screen and of the braid, the cable is passed through a bath of molten metal, the occurrence of tin. During the application of this molten metal, the ribbon plays the role of thermal shield to thermally insulate the insulation of molten metal, whereas in the absence of the ribbon the molten metal would come directly into contact with the insulation and could degrade it.

Le câble coaxial ainsi obtenu est flexible tout en ayant un écran performant. Cependant la couche de métal entre la tresse et le ruban n'est pas d'épaisseur uniforme tout autour du câble, du fait de sa fluidité à l'état fondu. De plus le procédé de fabrication d'un tel écran est long et peu commode. Comme indiqué dans ce document, il ne peut être réalisé en continu en ligne, du fait des vitesses très différentes de mise en place de ses différentes parties. La mise en place de la tresse étant nettement plus lente que celle des autres parties. Par ailleurs, alors que l'utilisation d'une tresse serrée est avantageuse pour une bonne obturation possible de ses interstices par le métal fondu, elle rend par contre plus difficile et incertain un bon écoulement du métal fondu à travers elle pour sa liaison au ruban et la fermeture de la ligne d'ouverture des bords du ruban. En outre, l'utilisation d'un bain d'étain fondu nécessite des dispositifs de sécurité pour éviter les risques de brûlure et d'inhalation de vapeurs.The coaxial cable thus obtained is flexible while having a screen efficient. However, the metal layer between the braid and the ribbon is not no uniform thickness all around the cable, due to its fluidity in the state molten. In addition, the manufacturing process for such a screen is long and little dresser. As indicated in this document, it cannot be carried out in continuous online, due to the very different speeds of setting up its different parts. The installation of the braid being much slower than that of other parties. By the way, while using a braid tight is advantageous for a good possible obturation of its interstices by molten metal, on the other hand it makes a good and more difficult and uncertain flow of molten metal through it for its binding to the ribbon and the closing the opening line of the edges of the ribbon. In addition, the use of a molten tin bath requires safety devices to avoid risk of burns and inhalation of vapors.

La présente invention a pour but de réaliser un câble coaxial flexible ayant une structure d'écran fiable conduisant à des performances excellentes et stables dans le temps et permettant un procédé de fabrication particulièrement simple et rapide.The object of the present invention is to produce a flexible coaxial cable having a reliable screen structure leading to excellent performance and stable over time and allowing a manufacturing process particularly simple and fast.

Selon l'invention, un câble coaxial flexible comportant une âme conductrice flexible, une isolation flexible autour de ladite âme et un écran métallique flexible autour de ladite isolation, ledit écran comportant un premier ruban métallique pourvu d'un revêtement métallique sur au moins une face de celui-ci et enroulé hélicoïdalement autour de ladite isolation en présentant des enroulements successifs se chevauchant selon une zone de chevauchement hélicoïdale continue le long dudit câble, est caractérisé en ce que ledit premier ruban est fermé de manière étanche sur lui-même dans toute ladite zone de chevauchement desdits enroulements par ledit revêtement soudant lesdits enroulements les uns aux autres. According to the invention, a flexible coaxial cable comprising a core flexible conductive, flexible insulation around said core and a screen flexible metal around said insulation, said screen comprising a first metal strip provided with a metal coating on at least one side of it and helically wrapped around said insulation in having successive windings overlapping in a zone of continuous helical overlap along said cable, is characterized in that that said first ribbon is tightly closed on itself in all of said overlap area of said windings by said coating welding said windings to each other.

Pareillement selon la présente invention, un câble coaxial flexible, comportant une âme conductrice flexible, une isolation flexible autour de ladite âme et un écran métallique flexible autour de ladite isolation, ledit écran comportant un premier ruban métallique et un deuxième ruban métallique extérieur enroulés hélicoïdalement autour de ladite isolation et munis au moins pour l'un d'entre eux d'un revêtement métallique sur au moins une face de celui-ci est caractérisé en ce que chacun desdits rubans présente des enroulements à déjoint hélicoïdal continu le long dudit câble, en ce que les enroulements dudit deuxième ruban recouvrent totalement le déjoint du premier ruban et partiellement les enroulements dudit premier ruban, et en ce que les zones de recouvrement des enroulements desdits rubans sont soudées de manière étanche par ledit revêtement prévu sur au moins l'une des deux faces en regard desdits rubans.Similarly according to the present invention, a flexible coaxial cable, having a flexible conductive core, flexible insulation around said core and a flexible metal screen around said insulation, said screen comprising a first metallic ribbon and a second ribbon metallic exterior wound helically around said insulation and provided at least for one of them with a metallic coating on at at least one side thereof is characterized in that each of said ribbons has windings with continuous helical junction along said cable, in that the windings of said second ribbon completely cover the backing of the first ribbon and partially the windings of said first ribbon, and in that the overlap zones of the windings of said ribbons are sealed by said coating provided on the minus one of the two opposite faces of said ribbons.

Ce câble présente avantageusement au moins l'une des caractéristiques additionnelles suivantes :

  • ledit premier ruban présente un pas d'enroulement compris entre 0,2 et 10 mm et ledit câble un diamètre sur ladite isolation compris entre 0,2 et 8 mm.
  • ledit écran comporte un ruban métallique intérieur posé longitudinalement directement autour de ladite isolation, en ayant des bords se chevauchant.
This cable advantageously has at least one of the following additional characteristics:
  • said first strip has a winding pitch of between 0.2 and 10 mm and said cable has a diameter on said insulation of between 0.2 and 8 mm.
  • said screen comprises an internal metal strip laid longitudinally directly around said insulation, having overlapping edges.

L'invention a également pour objet un procédé de fabrication dudit câble, caractérisé en ce qu'il consiste à soumettre le câble muni dudit écran à un chauffage périphérique de soudure des enroulements de chaque ruban composant ledit écran, sans apport extérieur de matière de soudure.The invention also relates to a method for manufacturing said cable, characterized in that it consists in subjecting the cable provided with said screen to a peripheral heating of welding of the windings of each ribbon composing said screen, without external input of solder material.

Avantageusement le chauffage périphérique de soudure est assuré par un bobinage à induction alimenté en haute fréquence, monté sur une ligne de réalisation en continu dudit écran.Advantageously, the peripheral welding heating is provided. by a high frequency induction winding, mounted on a continuous production line of said screen.

Les caractéristiques et avantages de l'invention ressortiront de la description faite ci-après en rérérence aux dessins ci-annexés dans lesquels :

  • la figure 1 est une vue en perspective d'un premier mode de réalisation d'un câble coaxial flexible selon l'invention,
  • la figure 2 est une vue en perspective d'un autre mode de réalisation d'un câble coaxial flexible selon l'invention,
  • la figure 3 est une vue en perspective d'un autre mode de réalisation du câble selon l'invention,
  • la figure 4 est une vue schématique illustrant le procédé de réalisation du câble de la figure 1.
The characteristics and advantages of the invention will emerge from the description given below with reference to the attached drawings in which:
  • FIG. 1 is a perspective view of a first embodiment of a flexible coaxial cable according to the invention,
  • FIG. 2 is a perspective view of another embodiment of a flexible coaxial cable according to the invention,
  • FIG. 3 is a perspective view of another embodiment of the cable according to the invention,
  • FIG. 4 is a schematic view illustrating the method for producing the cable of FIG. 1.

En se référant à la figure 1, le câble comporte une âme conductrice flexible 1, une isolation flexible 2 recouvrant ladite âme et un écran flexible 3 entourant ladite isolation.Referring to Figure 1, the cable has a conductive core flexible 1, flexible insulation 2 covering said core and a flexible screen 3 surrounding said insulation.

Cet écran flexible 3 est constitué par un ruban de métal 4, qui est pourvu d'un revêtement métallique 5 sur au moins sa face extérieure, est enroulé hélicoïdalement autour de l'isolation, en ayant ses enroulements se chevauchant largement, et est fermé de manière étanche sur lui-même par ledit revêtement soudant lesdits enroulements les uns aux autres dans toute leur zone de chevauchement.This flexible screen 3 is constituted by a metal strip 4, which is provided with a metallic coating 5 on at least its outer face, is wrapped helically around the insulation, having its windings overlapping widely, and is tightly closed on itself by said coating welding said windings to each other throughout their overlapping area.

Le chevauchement noté 6 des enroulements est illustré de 50 %. En pratique il peut être moindre, en étant toutefois d'au moins de 20 à 25 % et de préférence de l'ordre de 40 %. Il définit la zone de chevauchement soudée, sans apport de matière extérieure, qui est hélicoïdale et continue le long du câble pour une parfaite étanchéité et une conservation des performances de l'écran 3 ainsi constitué.The overlap noted 6 of the windings is illustrated by 50%. In practical it may be less, being however at least 20 to 25% and preferably around 40%. It defines the overlap area welded, without any external material, which is helical and continues the along the cable for perfect sealing and conservation of performance of the screen 3 thus formed.

Dans ce câble, l'âme conductrice 1 est une âme massive monoconducteur ou une âme toronnée multibrins, par exemple en cuivre nu, étamé, argenté ou en alliage de cuivre ou encore en acier recouvert de cuivre.In this cable, the conductive core 1 is a solid core single conductor or a stranded stranded core, for example of bare copper, tinned, silver or copper alloy or steel coated with copper.

L'isolation est un diélectrique classique ou expansé, tels que du PTFE, FEP, PFA, PE ou PP. L'écran 4 est réalisé de préférence par un ruban de cuivre étamé, dont le revêtement d'étain est fondu pour la soudure directe de ses enroulements les uns aux autres dans toute leur zone de chevauchement. Le ruban 4 peut être étamé sur ses deux faces.The insulation is a conventional or expanded dielectric, such as PTFE, FEP, PFA, PE or PP. The screen 4 is preferably produced by a ribbon of tinned copper, the tin coating of which is melted for soldering direct from its windings to each other throughout their area of overlap. The ribbon 4 can be tinned on both sides.

Ce câble est avantageusement un câble coaxial de diamètre sur l'isolation 2 compris entre 0,2 et 8 mm. Le ruban utilisé 4 a une largeur de 0,2 à 15 mm et présente un pas d'enroulement de 0,12 à 10 mm, suivant le diamètre de l'isolation.This cable is advantageously a coaxial cable of diameter over insulation 2 between 0.2 and 8 mm. The ribbon used 4 has a width of 0.2 to 15 mm and has a winding pitch of 0.12 to 10 mm, depending on the insulation diameter.

Le câble peut bien entendu être muni d'une gaine extérieure de protection, qui est optionnelle et non représentée.The cable can of course be provided with an outer sheath of protection, which is optional and not shown.

En se référant aux figures 2 et 3, on a désigné par 13 ou 13'l'écran réalisé autour de l'isolation 2 de l'âme conductrice 1. Cet écran métallique 13 ou 13' comporte :

  • Un ruban intérieur 14, qui est posé en long directement autour de l'isolation 2 et a ses bords se recouvrant longitudinalement ainsi que représenté en 15.
  • Un ruban intermédiaire 16 enroulé hélicoïdalement autour du ruban 14 et
  • Un ruban extérieur 18 enroulé hélidoïdalement autour du ruban 16.
Referring to FIGS. 2 and 3, the screen made around the insulation 2 of the conductive core 1 has been designated by 13 or 13 ′. This metal screen 13 or 13 ′ comprises:
  • An inner strip 14, which is laid lengthwise directly around the insulation 2 and has its edges overlapping longitudinally as shown in 15.
  • An intermediate ribbon 16 wound helically around the ribbon 14 and
  • An outer ribbon 18 helically wound around the ribbon 16.

Le ruban 14 est avantageusement constitué par un ruban en laminé plastique/métal dont la face plastique est contre l'isolation 2. Les rubans 16 et 18 sont avantageusement constitué par des rubans en métal, par exemple en cuivre, et munis de couches de revêtement métallique 17 et 19, par exemple d'étain ou à base d'étain ou, au moins sur leur face intérieure.The tape 14 is advantageously constituted by a laminated tape plastic / metal with the plastic side against the insulation 2. The tapes 16 and 18 are advantageously constituted by metal ribbons, for example made of copper, and provided with metallic coating layers 17 and 19, by example of tin or tin-based or, at least on their inner side.

Les rubans 16 et 18 sont enroulés dans le même sens et au même pas, en étant décalés l'un relativement à l'autre de l'ordre de ¼ à ¾ de la valeur du pas d'enroulement. Ils sont soudés l'un à l'autre et au ruban 14 par les revêtements 17 et 19.Ribbons 16 and 18 are wound in the same direction and at the same not, being offset relative to each other by around ¼ to ¾ of the value of the winding step. They are welded to each other and to the tape 14 by coatings 17 and 19.

Dans la figure 2, chacun des deux rubans hélicoïdaux 16 et 18 a ses enroulements se chevauchant largement. Le ruban longitudinal intérieur 14 est optionnel.In Figure 2, each of the two helical bands 16 and 18 has its windings largely overlapping. The inner longitudinal strip 14 is optional.

Dans la figure 3, chacun des rubans hélicoïdaux 16 et 18 présente un déjoint 16' et 18' entre ses enroulements, ce déjoint étant continu le long du câble. Les enroulements du ruban hélicoïdal le plus extérieur 18 recouvrent totalement le déjoint 16' du ruban 16 et partiellement les enroulements de celui-ci. Le ruban longitudinal 14 est optionnel dans l'écran du câble.In Figure 3, each of the helical bands 16 and 18 has a 16 'and 18' gap between its windings, this gap being continuous along the cable. The outermost helical ribbon windings 18 overlap totally the gap 16 'of the ribbon 16 and partially the windings of this one. The longitudinal strip 14 is optional in the cable screen.

Le câble de la figure 2 ou 3 peut également comporter une gaine extérieure de protection, non représentée. Ses dimensions et le pas d'enroulement de ses rubans hélicoïdaux sont tels que défini pour le câble de la figure 1.The cable of Figure 2 or 3 may also have a sheath protective exterior, not shown. Its dimensions and the pitch of its helical ribbons are as defined for the cable Figure 1.

On note en regard de la figure 1, que le câble peut comporter un ruban longitudinal (tel que le ruban 14 de la figure 2 ou 3) sous le ruban hélicoïdal 4, ce dernier étant alors muni d'un revêtement métallique intérieur et optionnellement du revêtement métallique extérieur 5.It is noted with reference to FIG. 1, that the cable may include a longitudinal tape (such as tape 14 in Figure 2 or 3) under the tape helical 4, the latter then being provided with an internal metallic coating and optionally of the exterior metallic coating 5.

Le procédé de réalisation en continu en ligne de l'écran 3 sur l'âme conductrice 1 munie de son isolation 2 est illustré dans la figure 4. L'âme conductrice isolée notée par les références 1 et 2 est prélevée d'une bobine de stockage 20 et traverse une station de rubanage 22, qui reçoit le ruban 4 muni de son revêtement 5. Ce ruban est prélevé d'un rouleau 21 et est enroulé hélicoïdalement autour de l'âme isolée, ainsi que décrit en regard de la figure 1. Le câble muni de ce ruban passe alors dans une station 23 de soudure des enroulements du ruban les uns aux autres, dans laquelle la soudure est réalisée, sans apport extérieur de matière de soudure, directement par le revêtement 5. Cette station de soudure comporte à cet effet un bobinage à induction 24 alimenté en haute fréquence, qui assure la fusion du revêtement 5 et la soudure résultante des enroulements les uns aux autres. Le câble muni de son écran 3 ainsi fermé de manière étanche est stocké sur une bobine de réception 25.The process for continuously producing screen 3 on the core online conductor 1 provided with its insulation 2 is illustrated in FIG. 4. The core insulated conductor noted by references 1 and 2 is taken from a coil storage 20 and passes through a tape station 22, which receives the tape 4 provided with its coating 5. This ribbon is taken from a roller 21 and is helically wrapped around the insulated core, as described opposite Figure 1. The cable with this ribbon then passes through a station 23 of soldering the ribbon windings to each other, in which the welding is carried out, without external input of welding material, directly by the coating 5. This soldering station comprises at this effect an induction coil 24 supplied at high frequency, which ensures the fusion of the coating 5 and the resulting weld of the windings to others. The cable provided with its screen 3 thus tightly closed is stored on a take-up reel 25.

Bien entendu la réalisation en continu en ligne de l'écran 13 ou 13' du câble de la figure 2 ou 3 est obtenue de manière analogue, en mettant le cas échéant en place le ruban interne optionnel posé en long autour de l'âme isolée puis le premier ruban hélicoïdal et enfin le ruban hélicoïdal extérieuret en faisant alors défiler le câble dans la station de soudure précitée. Le câble est alors stocké sur la bobine de réception.Of course the continuous production online of the screen 13 or 13 ' of the cable of Figure 2 or 3 is obtained analogously, by putting the optionally in place the optional internal ribbon laid lengthwise around the core insulated then the first helical ribbon and finally the external helical ribbon and by then running the cable through the aforementioned soldering station. The cable is then stored on the take-up reel.

Claims (9)

Câble coaxial flexible, comportant une âme conductrice flexible (1), une isolation flexible (2) autour de ladite âme et un écran métallique flexible (3, 13, 13') autour de ladite isolation, ledit écran comportant un premier ruban métallique (4, 16), pourvu d'un revêtement métallique (5, 17), sur au moins une face de celui-ci et enroulé hélicoïdalement autour de ladite isolation en présentant des enroulements successifs se chevauchant selon une zone de chevauchement hélicoïdale continue le long dudit câble, caractérisé en ce que ledit premier ruban (4) est fermé de manière étanche sur lui-même dans toute ladite zone de chevauchement desdits enroulements par ledit revêtement (5) soudant lesdits enroulements les uns aux autres.Flexible coaxial cable, comprising a flexible conductive core (1), a flexible insulation (2) around said core and a flexible metallic screen (3, 13, 13 ') around said insulation, said screen comprising a first metallic ribbon (4 , 16), provided with a metallic coating (5, 17), on at least one face thereof and wound helically around said insulation by presenting successive windings overlapping in a continuous helical overlapping zone along said cable , characterized in that said first strip (4) is closed in a sealed manner over itself throughout said zone of overlap of said windings by said coating (5) welding said windings to one another. Câble selon la revendication 1, caractérisé en ce qu'il comporte un deuxième ruban métallique (18), enroulé hélicoïdalement sur ledit premier ruban (16) en ayant des enroulements se chevauchant les uns les autres pourvu d'un revêtement métallique (19) sur au moins celle de ses faces située en regard dudit premier ruban et ayant ses enroulements soudés entre eux et à ceux dudit premier ruban.Cable according to claim 1, characterized in that it comprises a second metal strip (18), wound helically on said first strip (16) having overlapping windings provided with a metallic coating (19) on at least that of its faces located opposite said first ribbon and having its windings welded together and to those of said first ribbon. Câble coaxial flexible, comportant une âme conductrice flexible (1), une isolation flexible (2) autour de ladite âme et un écran métallique flexible (13') autour de ladite isolation, ledit écran comportant un premier ruban métallique (16) et un deuxième ruban métallique extérieur (18) enroulés hélicoïdalement autour de ladite isolation et munis au moins pour l'un d'entre eux d'un revêtement métallique (17, 19) sur au moins une face de celui-ci, caractérisé en ce que chacun desdits rubans (16, 18) présente des enroulements à déjoint hélicoïdal (16' 18') continu le long dudit câble, en ce que les enroulements dudit deuxième ruban (18) recouvrent totalement le déjoint du premier ruban (16) et partiellement les enroulements dudit premier ruban, et en ce que les zones de recouvrement des enroulements desdits rubans sont soudées de manière étanche par ledit revêtement (17, 19) prévu sur au moins l'une des deux faces en regard desdits rubans.Flexible coaxial cable, comprising a flexible conductive core (1), a flexible insulation (2) around said core and a flexible metallic screen (13 ') around said insulation, said screen comprising a first metallic strip (16) and a second external metallic strip (18) wound helically around said insulation and provided at least for one of them with a metallic coating (17, 19) on at least one face thereof, characterized in that each of said ribbons (16, 18) have windings with helical junction (16 '18') continuous along said cable, in that the windings of said second ribbon (18) completely cover the junction of the first ribbon (16) and partially the windings of said first ribbon, and in that the areas of overlap of the windings of said ribbons are sealed by said coating (17, 19) provided on at least one of the two opposite faces of said ribbons. Câble selon l'une des revendications 1 à 3, caractérisé en que ledit écran comporte en outre un ruban métallique intérieur (14), posé longitudinalement directement autour de ladite isolation, en ayant des bords (15) se chevauchant. Cable according to one of claims 1 to 3, characterized in that said screen further comprises an internal metal strip (14), placed longitudinally directly around said insulation, having edges (15) overlapping. Câble selon la revendication 4, caractérisé en que ledit ruban intérieur (14) est en laminé plastique/métal.Cable according to claim 4, characterized in that said ribbon interior (14) is made of plastic / metal laminate. Câble selon l'une des revendications 1 et 3, caractérisé en ce que ledit premier ruban (4, 16) présente un pas d'enroulement compris entre 0,2 et 10 mm et ledit câble un diamètre sur ladite isolation compris entre 0,2 et 8 mm.Cable according to one of claims 1 and 3, characterized in that said first strip (4, 16) has a winding pitch of between 0.2 and 10 mm and said cable a diameter on said insulation of between 0.2 and 8 mm. Câble selon l'une des revendications 1 à 6, caractérisé en ce que chaque ruban muni du revêtement métallique est en cuivre étamé.Cable according to one of claims 1 to 6, characterized in that each strip provided with the metallic coating is made of tinned copper. Procédé de fabrication d'un câble selon l'une des revendications 1 à 7, caractérisé en ce qu'il consiste à soumettre le câble muni dudit écran à un chauffage périphérique de soudure des enroulements de chaque ruban composant ledit écran, sans apport extérieur de matière de soudure.Method of manufacturing a cable according to one of claims 1 to 7, characterized in that it consists in subjecting the cable provided with said screen to a peripheral heating of welding of the windings of each ribbon making up said screen, without external input from solder material. Procédé selon la revendication 8, caractérisé en ce qu'il consiste à assurer ledit chauffage périphérique de soudure au moyen d'un bobinage à induction (24) alimenté en haute fréquence, qui est prévu sur une ligne de réalisation en continu dudit écran sur le câble et est traversé par ledit câble.Method according to claim 8, characterized in that it consists in ensuring said peripheral heating of welding by means of an induction coil (24) supplied at high frequency, which is provided on a continuous production line of said screen on the cable and is crossed by said cable.
EP01401370A 2000-05-25 2001-05-23 Flexible coaxial cable and its manufacturing method Expired - Lifetime EP1158542B1 (en)

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FR0006689 2000-05-25
FR0006689A FR2809528B1 (en) 2000-05-25 2000-05-25 FLEXIBLE COAXIAL CABLE AND MANUFACTURING METHOD THEREOF

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EP (1) EP1158542B1 (en)
AT (1) ATE301867T1 (en)
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US6583361B2 (en) 2003-06-24
ATE301867T1 (en) 2005-08-15
EP1158542B1 (en) 2005-08-10
US20020003046A1 (en) 2002-01-10
DE60112509D1 (en) 2005-09-15
DE60112509T2 (en) 2006-06-01
FR2809528B1 (en) 2002-07-19
FR2809528A1 (en) 2001-11-30

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