EP0851437A1 - Easy-connectable shielded cable - Google Patents

Easy-connectable shielded cable Download PDF

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Publication number
EP0851437A1
EP0851437A1 EP97403130A EP97403130A EP0851437A1 EP 0851437 A1 EP0851437 A1 EP 0851437A1 EP 97403130 A EP97403130 A EP 97403130A EP 97403130 A EP97403130 A EP 97403130A EP 0851437 A1 EP0851437 A1 EP 0851437A1
Authority
EP
European Patent Office
Prior art keywords
cable
shielding
screen
incisions
along
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.)
Ceased
Application number
EP97403130A
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German (de)
French (fr)
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
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alcatel SA, Alcatel Alsthom Compagnie Generale dElectricite filed Critical Alcatel SA
Publication of EP0851437A1 publication Critical patent/EP0851437A1/en
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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
    • H01B7/38—Insulated conductors or cables characterised by their form with arrangements for facilitating removal of insulation
    • 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

Definitions

  • the present invention relates to cables comprising at least one electrical conductor and a shielding screen formed of a ribbon. It applies in particular to cables with multiple conductors such as cables used in IT including four pairs of conductors formed by two quartes.
  • the invention aims to overcome the drawbacks of the state of the art.
  • a cable comprising at minus an electrical conductor, a ribbon laid over and forming shielding screen and tearing means of said screen is characterized in that said means of tearing is formed by incisions in the screen of shielding arranged along at least one line running on along the cable.
  • the invention makes it possible to get rid of the rope of tear used in the prior art which, on the one hand simplifies the manufacture of the cable and, on the other hand, especially in the case of small cables, avoids the excess thickness due to the tearing line.
  • the shielding according to the invention is also well better than that offered by a set of two ribbons each posed already.
  • the shielding tape can be laid lengthwise or helically.
  • FIG. 1 shows a shielded flat cable 1 comprising two quartes 2. This type of cable is used in the IT field for data transmission.
  • Each quarter 2 consists of a twist of four solid copper conductors 3, the conductors 3 being each insulated by a first insulating sheath 4 in one material with a low dielectric constant, such as polyethylene or expanded polypropylene for example.
  • the diameter of the solid conductors 3 is 0.6 mm and the diameter of the conductors insulated by means of the sheaths is 1.3 mm.
  • Quarters 2 arranged side by side, are surrounded a second insulating sheath 5.
  • This can be consisting of a thin shell 0.25 to 1 mm thick made of polyethylene, which allows rigid and reliable support of quads relative to each other while providing a sufficient elasticity to allow handling of the cable.
  • the shielding screen is an aluminum tape 50 ⁇ m thick and 5 mm wide.
  • an outer envelope for maintaining and protection 8 for example PVC, is extruded around all.
  • the second sheath 5 can be omitted if the shielding screen is able to ensure the function of keeping the four in place compared to each other.
  • the shielding tape 7 is laid, in a conventional manner, helical and overlapping. It could also be laid lengthwise and overlapping. Incisions 10 are obtained by perforation by means of a wheel comprising points in the shape of needles. This perforation can be performed on the ribbon before it is put in place (in the case where each line of incisions is parallel to the edge of the ribbon), or when manufacturing the cable after installation of the screen and before wrapping in the sheath 8.
  • needles 0.2 to 0.5 mm in diameter with a length of 5/100 to 1/10 mm allow to create the desired incisions without hurting insulated conductors.
  • the incisions 10 are formed according to one or more lines running along the cable. These lines can be straight, helical, sinusoidal, zig-zag, etc ...
  • the incisions 9A and 9B of each of the screens of shielding 6A and 6B are not necessarily identical, nor in their size and in their shape.
  • the invention is not limited to the embodiments represented. On the contrary, it applies to any cable comprising at least one electrical conductor and at least one shielding tape, regardless of the number of conductors and the number of sub-assemblies of conductors screened separately.

Abstract

The cable has one or more electrical conductors (3) with a strip of suitable material wound round the conductor group to provide a shielding screen (6). The screen has lines of weakness formed along its length to allow it to be easily separated. The weakness is formed by perforations (10) positioned at regular intervals along the shielding strip. The size of the perforations is chosen to minimise the effect on the shielding properties. The perforations are in a line that lies either along the length of the cable, parallel to the conductors or runs along the strip forming the shielding so that the perforations spiral along the length of the cable.

Description

La présente invention concerne les câbles comportant au moins un conducteur électrique et un écran de blindage formé d'un ruban. Elle s'applique en particulier aux câbles de données comportant plusieurs conducteurs tels que les câbles utilisés dans le domaine informatique comprenant quatre paires de conducteurs formées de deux quartes.The present invention relates to cables comprising at least one electrical conductor and a shielding screen formed of a ribbon. It applies in particular to cables with multiple conductors such as cables used in IT including four pairs of conductors formed by two quartes.

Dans la plupart des applications, il est nécessaire de pouvoir ôter le ruban de blindage pour raccorder les conducteurs du câble à un connecteur. A cette fin, il est connu de placer un filin de déchirement disposé en long sous le ruban de blindage; voir par exemple US-A-5 107 076. Cette solution n'est cependant pas très satisfaisante car il faut tout d'abord ouvrir le ruban de blindage sur une longueur d'une dizaine de centimètres afin de pouvoir accéder au filin de déchirement; cette opération présente ainsi le risque d'endommager le câble. Par ailleurs, certains rubans de blindage utilisés, tels que les complexes d'aluminium contrecollés à un support en polyester sont très résistants et par conséquent très difficiles à déchirer.In most applications, it is necessary to ability to remove shielding tape to connect cable conductors to a connector. To this end, it is known to place a tearing line arranged in length under the shielding tape; see for example US-A-5,107,076. solution is however not very satisfactory because it is necessary first open the shielding tape over a length about ten centimeters in order to be able to access the tearing line; this operation thus presents the risk of damaging the cable. In addition, some ribbons of shielding used, such as aluminum complexes laminated to a polyester backing are very resistant and therefore very difficult to tear.

Il est également connu de poser deux rubans à déjoint, avec des pas de sens opposés pour former un écran de blindage; voir par exemple DE-A-3 123 040. La nécessité d'utiliser deux rubans constitue un inconvénient. En outre, un blindage eficace est difficile à obtenir avec des signaux de fréquence supérieure à 100 MHz.It is also known to lay two ribbons at a time, with opposite direction steps to form a screen of shielding; see for example DE-A-3 123 040. The need using two ribbons is a drawback. In addition, effective shielding is difficult to obtain with signals of frequency higher than 100 MHz.

L'invention a pour but de pallier les inconvénients de l'état de la technique.The invention aims to overcome the drawbacks of the state of the art.

Conformément à l'invention, un câble comportant au moins un conducteur électrique, un ruban posé à recouvrement et formant écran de blindage et un moyen de déchirement dudit écran est caractérisé en ce que ledit moyen de déchirement est formé par des incisions dans l'écran de blindage disposées suivant au moins une ligne courant le long du câble. According to the invention, a cable comprising at minus an electrical conductor, a ribbon laid over and forming shielding screen and tearing means of said screen is characterized in that said means of tearing is formed by incisions in the screen of shielding arranged along at least one line running on along the cable.

Ces incisions forment une amorce de rupture à partir desquelles il est facile de procéder à l'arrachage du ruban de blindage.These incisions form a beginning of rupture from which it is easy to tear off the tape shielding.

L'invention permet de s'affranchir du filin de déchirement utilisé dans l'art antérieur ce qui, d'une part simplifie la fabrication du câble et, d'autre part, notamment dans le cas de câbles de petites dimensions, évite la surépaisseur due au filin de déchirement.The invention makes it possible to get rid of the rope of tear used in the prior art which, on the one hand simplifies the manufacture of the cable and, on the other hand, especially in the case of small cables, avoids the excess thickness due to the tearing line.

Le blindage selon l'invention est en outre bien meilleur que celui offert par un ensemble de deux rubans posés chacun à déjoint.The shielding according to the invention is also well better than that offered by a set of two ribbons each posed already.

Selon l'invention, le ruban de blindage peut être posé en long ou en hélice.According to the invention, the shielding tape can be laid lengthwise or helically.

Les caractéristiques et avantages de l'invention apparaitront mieux à la lecture des modes de réalisation suivants, donnés à titre illustratif mais non limitatif, faite en référence aux dessins annexés, sur lesqueles :

  • la figure 1 représente une quarte blindée dans laquelle le ruban de blindage présente des lignes d'incisions en hélice, et
  • la figure 2 représente un câble blindé à deux quartes, chaque quarte étant blindée individuellement.
The characteristics and advantages of the invention will appear better on reading the following embodiments, given by way of illustration but not limitation, made with reference to the appended drawings, in which:
  • FIG. 1 represents an armored quarter in which the armor strip has helical incision lines, and
  • FIG. 2 represents a two-quarter shielded cable, each quarter being individually shielded.

Dans les figures, les éléments communs portent les mêmes numéros de référence.In the figures, the common elements bear the same reference numbers.

On a représenté sur la figure 1 un câble plat blindé 1 comprenant deux quartes 2. Ce type de câble est utilisé dans le domaine informatique pour la transmisssion des données. Chaque quarte 2 est constituée d'une torsade de quatre conducteurs massifs en cuivre 3, les conducteurs 3 étant isolés chacun par une première gaine isolante 4 en un matériau ayant une faible constante diélectique, comme le polyéthylène ou le polypropylène expansé par exemple.FIG. 1 shows a shielded flat cable 1 comprising two quartes 2. This type of cable is used in the IT field for data transmission. Each quarter 2 consists of a twist of four solid copper conductors 3, the conductors 3 being each insulated by a first insulating sheath 4 in one material with a low dielectric constant, such as polyethylene or expanded polypropylene for example.

Le diamètre des conducteurs massifs 3 est de 0,6 mm et le diamètre des conducteurs isolés au moyen des gaines est de 1,3 mm. The diameter of the solid conductors 3 is 0.6 mm and the diameter of the conductors insulated by means of the sheaths is 1.3 mm.

Les quartes 2, disposées côte à côte, sont entourées d'une deuxième gaine isolante 5. Celle-ci peut être constituée d'une mince enveloppe d'épaisseur de 0,25 à 1 mm en polyéthylène, qui permet un maintien rigide et fiable des quartes l'une par rapport à l'autre tout en offrant une élasticité suffisante pour permettre de manipuler le câble. Un écran de blindage 6, constitué par un ruban 7 déposé en hélice, est réalisé autour de la deuxième gaine pour éviter que les signaux transportés par le câble ne soient perturbés par des rayonnements électromagnétiques extérieurs.Quarters 2, arranged side by side, are surrounded a second insulating sheath 5. This can be consisting of a thin shell 0.25 to 1 mm thick made of polyethylene, which allows rigid and reliable support of quads relative to each other while providing a sufficient elasticity to allow handling of the cable. A shielding screen 6, constituted by a ribbon 7 deposited in propeller, is made around the second sheath to avoid the signals carried by the cable are not disturbed by external electromagnetic radiation.

A titre d'exemple, l'écran de blindage est un ruban d'aluminium de 50 µm d'épaisseur et de 5 mm de largeur.For example, the shielding screen is an aluminum tape 50 µm thick and 5 mm wide.

Enfin, une enveloppe extérieure de maintien et de protection 8, par exemple en PVC, est extrudée autour de l'ensemble.Finally, an outer envelope for maintaining and protection 8, for example PVC, is extruded around all.

Dans le câble représenté sur la figure 1, la deuxième gaine 5 peut être omise si l'écran de blindage est à même d'assurer la fonction de maintien en place des quartes l'une par rapport à l'autre.In the cable shown in Figure 1, the second sheath 5 can be omitted if the shielding screen is able to ensure the function of keeping the four in place compared to each other.

Le ruban de blindage 7 est posé, de manière classique, en hélice et à recouvrement. Il pourrait également être posé en long et à recouvrement. Les incisions 10 sont obtenues par perforation au moyen d'une molette comportant des pointes en forme d'aiguilles. Cette perforation peut être effectuée sur le ruban avant qu'il ne soit mis en place (dans le cas où chaque ligne d'incisions est parallèle au bord du ruban), ou lors de la fabrication du câble après la pose de l'écran et avant l'enveloppage dans la gaine 8.The shielding tape 7 is laid, in a conventional manner, helical and overlapping. It could also be laid lengthwise and overlapping. Incisions 10 are obtained by perforation by means of a wheel comprising points in the shape of needles. This perforation can be performed on the ribbon before it is put in place (in the case where each line of incisions is parallel to the edge of the ribbon), or when manufacturing the cable after installation of the screen and before wrapping in the sheath 8.

Pour un câble tel que défini plus haut, des aiguilles de diamètre 0,2 à 0,5 mm ayant une longueur de 5/100 à 1/10 mm permettent de créer les incisions désirées sans blesser les conducteurs isolés.For a cable as defined above, needles 0.2 to 0.5 mm in diameter with a length of 5/100 to 1/10 mm allow to create the desired incisions without hurting insulated conductors.

De manière plus générale, on conçoit que des incisions ayant une dimension de un à quelques dixièmes de millimètre n'affecte pas de manière sensible les propriétés d'écran du ruban de blindage aux fréquences de l'ordre de 100 MHz. More generally, we understand that incisions having a dimension of one to a few tenths of a millimeter does not significantly affect the screen properties of the shielding tape at frequencies of the order of 100 MHz.

Les incisions 10 sont formées suivant une ou plusieurs lignes courant le long du câble. Ces lignes peuvent être droites, hélicoïdales, sinusoïdales, en zig-zag, etc...The incisions 10 are formed according to one or more lines running along the cable. These lines can be straight, helical, sinusoidal, zig-zag, etc ...

Lorsque plusieurs lignes d'incisions sont réalisées, comme c'est le cas du câble représenté sur le figure 1, celles-ci sont réparties de préférence de manière à être équidistantes.When several lines of incisions are made, as in the case of the cable shown in FIG. 1, these are preferably distributed so as to be equidistant.

Selon le nombre de conducteurs et le type de signaux utilisés, il peut être utile dans certaines applications de blinder séparément des sous-ensembles de conducteurs. Ainsi, comme on l'a représenté sur la figure 2, on peut remplacer l'écran de blindage du câble à deux quartes représenté sur les figures précédentes par deux écrans de blindage, un pour chaque quarte.According to the number of conductors and the type of signals used, it may be useful in some applications of shield separately from conductor sub-assemblies. So, as shown in Figure 2, we can replace the two-quarter cable shielding screen shown on the previous figures by two shielding screens, one for each quarter.

Ceci permet d'améliorer le niveau de paradiaphonie entre quartes d'au moins 20 dB.This improves the level of crosstalk between quarters of at least 20 dB.

Dans des applications où l'interaction entre les quartes serait moindre, il est possible de ne prévoir un écran de blindage que sur l'une des deux quartes.In applications where the interaction between quartes would be less, it is possible to only plan a shielding screen only on one of the two quarters.

Les incisions 9A et 9B de chacun des écrans de blindage 6A et 6B ne sont pas nécessairement identiques, ni dans leur dimension ni dans leur forme.The incisions 9A and 9B of each of the screens of shielding 6A and 6B are not necessarily identical, nor in their size and in their shape.

L'invention n'est pas limitée aux modes de réalisation représentés. Elle s'applique au contraire à tout câble comportant au moins un conducteur électrique et au moins un ruban de blindage, quel que soient le nombre de conducteurs électriques et le nombre de sous-ensembles de conducteurs blindés séparément.The invention is not limited to the embodiments represented. On the contrary, it applies to any cable comprising at least one electrical conductor and at least one shielding tape, regardless of the number of conductors and the number of sub-assemblies of conductors screened separately.

Claims (7)

Câble comportant au moins un conducteur électrique (3), un ruban (7, 7A, 7B) posé à recouvrement et formant écran de blindage (6, 6A, 6B) et un moyen de déchirement dudit écran caractérisé en ce que ledit moyen de déchirement est formé par des incisions (10, 10A, 10B) dans l'écran de blindage (7) disposées suivant au moins une ligne courant le long du câble.Cable comprising at least one electrical conductor (3), a ribbon (7, 7A, 7B) placed overlapping and forming a screen of shield (6, 6A, 6B) and a means of tearing said screen characterized in that said tearing means is formed by incisions (10, 10A, 10B) in the shielding screen (7) arranged along at least one line running along the cable. Câble selon la revendication 1 caractérisé en ce que chaque ligne d'incisions (10, 10A, 10B) est une ligne en hélice par rapport à l'axe du câble.Cable according to claim 1 characterized in that each line of incisions (10, 10A, 10B) is a line in helix with respect to the axis of the cable. Câble selon la revendication 1 caractérisé en ce que chaque ligne d'incisions (10, 10A, 10B) est une ligne parallèle à l'axe du câble.Cable according to claim 1 characterized in that each line of incisions (10, 10A, 10B) is a line parallel to the axis of the cable. Câble selon l'une des revendications 1 à 3 caractérisé en ce que ledit ruban (7, 7A, 7B) est posé en hélice.Cable according to one of claims 1 to 3 characterized in that said strip (7, 7A, 7B) is placed in a helix. Câble selon l'une des revendications 1 à 3 caractérisé en ce que ledit ruban (7, 7A, 7B) est posé en long.Cable according to one of claims 1 to 3 characterized in that said strip (7, 7A, 7B) is laid lengthwise. Câble selon l'une des revendications précédentes comportant au moins deux sous-ensembles (2), chaque sous-ensemble comprenant un écran de blindage (6A, 6B) pourvu d'incisions (10, 10A, 10B) et au moins un conducteur électrique (3).Cable according to one of the preceding claims comprising at least two subsets (2), each subset comprising a shielding screen (6A, 6B) provided incisions (10, 10A, 10B) and at least one conductor electric (3). Câble selon la revendication 6 caractérisé en ce que chaque sous-ensemble (2) comporte quatre conducteurs torsadés.Cable according to claim 6 characterized in that each sub-assembly (2) has four conductors twisted.
EP97403130A 1996-12-23 1997-12-23 Easy-connectable shielded cable Ceased EP0851437A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9615844 1996-12-23
FR9615844A FR2757672B1 (en) 1996-12-23 1996-12-23 EASY TO CONNECT ARMORED CABLE

Publications (1)

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EP0851437A1 true EP0851437A1 (en) 1998-07-01

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EP97403130A Ceased EP0851437A1 (en) 1996-12-23 1997-12-23 Easy-connectable shielded cable

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EP (1) EP0851437A1 (en)
FR (1) FR2757672B1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2013123A1 (en) * 1970-03-19 1971-09-30 Kabel- u. Metallwerke Gutehoffnungshütte AG, 3000 Hannover Metal-sheathed electric cable
DE3123040A1 (en) * 1981-06-11 1983-01-05 Vacuumschmelze Gmbh, 6450 Hanau Magnetically screened cable having a screen consisting of soft-magnetic material
US5107076A (en) * 1991-01-08 1992-04-21 W. L. Gore & Associates, Inc. Easy strip composite dielectric coaxial signal cable

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2013123A1 (en) * 1970-03-19 1971-09-30 Kabel- u. Metallwerke Gutehoffnungshütte AG, 3000 Hannover Metal-sheathed electric cable
DE3123040A1 (en) * 1981-06-11 1983-01-05 Vacuumschmelze Gmbh, 6450 Hanau Magnetically screened cable having a screen consisting of soft-magnetic material
US5107076A (en) * 1991-01-08 1992-04-21 W. L. Gore & Associates, Inc. Easy strip composite dielectric coaxial signal cable

Also Published As

Publication number Publication date
FR2757672A1 (en) 1998-06-26
FR2757672B1 (en) 1999-01-22

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