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EP2034491B1 - Extremely flexible shielded electric data conductor - Google Patents

Extremely flexible shielded electric data conductor Download PDF

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Publication number
EP2034491B1
EP2034491B1 EP08012284.9A EP08012284A EP2034491B1 EP 2034491 B1 EP2034491 B1 EP 2034491B1 EP 08012284 A EP08012284 A EP 08012284A EP 2034491 B1 EP2034491 B1 EP 2034491B1
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EP
European Patent Office
Prior art keywords
electrical line
line according
subsequent
woven fabric
wires
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.)
Not-in-force
Application number
EP08012284.9A
Other languages
German (de)
French (fr)
Other versions
EP2034491A2 (en
EP2034491B9 (en
EP2034491A3 (en
Inventor
Wolfgang Dlugas
Lothar Kundinger
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.)
HEW Kabel GmbH and Co KG
Original Assignee
HEW Kabel GmbH and Co KG
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.)
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Publication date
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Publication of EP2034491A2 publication Critical patent/EP2034491A2/en
Publication of EP2034491A3 publication Critical patent/EP2034491A3/en
Publication of EP2034491B1 publication Critical patent/EP2034491B1/en
Application granted granted Critical
Publication of EP2034491B9 publication Critical patent/EP2034491B9/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
    • H01B11/1008—Features relating to screening tape per se
    • 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
    • H01B7/04—Flexible cables, conductors, or cords, e.g. trailing cables

Definitions

  • the present invention relates to a highly flexible shielded electrical line for high-frequency data transmission in pivotable screens, in particular for pivotable LCD (liquid crystal display) devices, with two wires for power and / or at least two data wires.
  • pivotable LCD liquid crystal display
  • the document EP 1 768 133 A2 discloses a highly flexible shielded line for high frequency data transmission in pivotable screens.
  • the present invention is therefore based on the object of providing a data line for the described pivotable screens, which with high flexibility and largely independent of the prevailing ambient temperatures, the function of the screens with optimized quality of the data signals, the data reception even for high data rates in areas of e.g. 800 Mbit / sec and more guaranteed.
  • This object is achieved according to the invention, characterized in that the stranded and / or bundled or combined into pairs cores are enclosed in total by a shield of uninsulated metallic wires, which is covered to the outside by a conductive fiber fleece, the surface electrically contacted the shield, and that the nonwoven cover is finally enclosed by an outer shell of a silicone rubber.
  • This structure of an electrical data line ensures the pivotability of a screen in any direction even under permafrost conditions with simultaneous undisturbed data transmission at a high data rate of 800 or 1000 MHz and above.
  • a connected to a line according to the invention screen can therefore be folded without affecting the quality of transmission of the respective data forward or backward, rotated in one or the other direction or pivoted or pulled in the direction of the viewer or moved away from it again.
  • the conductive nonwoven fabric according to the invention may be a nonwoven material impregnated with conductive materials, but also a nonwoven material impregnated with metal threads.
  • a preferred variant of the invention results when the conductive nonwoven fabric is a metal-coated plastic nonwoven, wherein the coating is preferably carried out by a vapor deposition of the plastic nonwoven, by a vapor deposition, for example with aluminum or silver or with their alloys.
  • the stranded and / or bundled or combined in pairs cores are held together in total by a arranged below the wire mesh insulating fiber fleece.
  • This insulating nonwoven fabric leads to a further reduction of the friction losses in the line structure and thus to increase the flexibility of the electrical line according to the invention.
  • the conductive nonwoven fabric according to the invention contributes to increase the transmission frequencies also in that the insulation of the data wires is constructed in two layers, with an inner winding of the conductor of a stretched and sintered porous tape or a film of a non-melt processable from the melt fluoropolymer and an outer closed layer of a melt processable fluoropolymer.
  • the melt non-processable fluoropolymer is most preferably a polytetrafluoroethylene, the term polytetrafluoroethylene also including tetrafluoroethylene polymers provided with modifying additives, but in such an amount that the polymer, such as the polytetrafluoroethylene itself, does not melt is processable.
  • This embodiment of the invention not only has the high flexibility in dynamic laying over a wide temperature range between -50 ° C and + 180 ° C, it is also easily suitable for a transmission frequency over 800 and 1000 MHz with a screen attenuation greater than 65dB.
  • a further improvement of this data line results when, in a continuation of the invention, the PTFE (polytetrafluoroethylene) winding of the conductor carries a layer of a melt-processable fluoropolymer, which is frictionally connected to at least the uppermost band or film layer. Since the ratio of the wall thicknesses of the tape or film winding to the frictionally connected layer in the practice of the invention is 3: 1, this layer is merely to be regarded as a skin layer covering the winding.
  • the tetrafluoroethylene / hexafluoropropylene copolymer (FEP), the perfluoroalkoxy polymer (PFA) or else the tetrafluoroethylene-perfluoroalkylvinyl ether copolymer (TFA / PFA) have proven to be suitable for this skin layer.
  • FEP tetrafluoroethylene / hexafluoropropylene copolymer
  • PFA perfluoroalkoxy polymer
  • TFA tetrafluoroethylene-perfluoroalkylvinyl ether copolymer
  • other known melt-processable fluoropolymers can sometimes find a beneficial application.
  • a particularly advantageous embodiment of the invention results when, in addition to the individual wires provided for data transmission, additional wires for the power supply are arranged in the line construction.
  • additional wires for the power supply are arranged in the line construction.
  • Such a power supply for example, require the adjusting motors on swivel displays or the drive motors for mirror adjustments in or on motor vehicles.
  • the electrical, the feed current leading conductors of these wires expediently carry insulation from a processable from the melt fluoropolymer.
  • the wires for the power supply and the data wires have the same or almost the same diameter. This makes it easy to unify all the wires simultaneously to form a single stranded bandage. This ensures that all cores have the same bending behavior under bending stresses. If a central filling strand, a so-called bridle, is required for rounding the core consisting of the stranded cores, then it has proven to be especially expedient to produce the filler strand from a stretched and sintered polytetrafluoroethylene (PTFE) strand molding.
  • the molded strand is advantageously made of a twisted to a strand band of PTFE. The advantage of such a molded strand is its high cold flexibility and the lack of material abrasion, which, as in the case of glass silk tents, easily leads to contamination of the electronic components in the pivotable LCD devices.
  • the invention is on hand in the Fig. 1 to 3 explained as embodiments data lines explained in more detail.
  • the electrical leads described here are suitable for low voltage / high speed data transmission over copper wires (LVDS) due to their particular characteristics.
  • the Fig.1 shows a single-pair shielded, highly flexible data line for an EMC optimized transmission of data (LVDS-interface) with extremely high bending flexibility over a wide temperature range, as in particular can be used advantageously in the automotive technology for the connection of swivel screens.
  • LVDS-interface EMC optimized transmission of data
  • the copper conductors 1 are insulated with a diameter of, for example, 0.50 mm with a winding 2 of a stretched and sintered tape or a corresponding sheet of polytetrafluoroethylene (PTFE), or the known under the trade name HEI-tape® the applicant ,
  • the winding 2 of the PTFE tape carries a skin layer 3 made of a melt processable fluoropolymer, for example, a tetrafluoroethylene / hexafluoropropylene copolymer (FEP).
  • Fill strands 4 in the interstices of the stranded individual cores serve to stabilize the stranding, they can be made of a suitable plastic, but also consist of glass fibers.
  • the stranding 5 having said individual elements is enclosed by the bandage 6 made of an insulating fiber fleece.
  • An existing of tinned copper wires screen braid is denoted by 7, it is covered by the band 8 of a one or both sides with aluminum or silver steamed fiber fleece.
  • the outer envelope of the data line according to the invention forms the jacket 9 of a H exertvulkan byden (HTV) silicone rubber.
  • the outer diameter of this constructed according to the invention data line is about 4.5 mm, the operating voltage according to their use in automotive technology 48V.
  • an embodiment of the invention according to the Fig. 2 use.
  • the electrical conductors 12 of the pairs 10 with an outer diameter of, for example, 0.6 mm in this embodiment consist of bare, tinned or silver-plated copper wires.
  • the insulation 13 of the conductor 12 consists of a melt-processable above-mentioned fluoropolymer, for example, an FEP.
  • the all four pairs together comprehensive banding 14 may consist of a Folienbewicklung of a polyester tape, according to the embodiment of the Fig.1 but can also take over the task of banding with advantage an insulating, friction-reducing fiber fleece.
  • the shielding of the data line is made of tinned or silver-plated copper wires existing mesh 15, which in turn is surrounded to improve the shielding effect and thus to optimize the data transfer from the banding 16 of a metallized nonwoven fabric.
  • the data line according to the invention through the jacket 17, for example, from a HTV silicone rubber or LSR rubber.
  • the uniformly flexible even at low temperatures silicone rubber sheath ensures here in connection with the described elements of the data line their high bending ability, which allows a dynamic Verlegungsart swivel orrackziebaren from drawers or covers screens.
  • the outer diameter is about 6.0 to 6.5 mm, the operating voltage is also 48V.
  • Fig. 3 a particularly advantageous embodiment of the invention, in which the two provided for data transmission single cores 18 and 19 and the two at least approximately the same diameter as these having cores 20 and 21, which serve the power supply, for example, servomotors with pivotable screens, are stranded together. Since the wires 20 and 21 are not used for data transmission, their electrical conductors 22 and 23 are provided only with an insulation 24 or 25 made of a melt-processable fluoropolymer, for example from a FEP. For data transmission, on the other hand, insulation with a low dielectric constant, for example in the order of magnitude of 1.3, is important.
  • the conductors 26 and 27 of the individual wires 18 and 19 are first insulated with a winding 28 or 29 from a stretched and sintered band or from a corresponding film of polytetrafluoroethylene.
  • These tape or film windings are each covered by insulating layers 30 and 31 of a meltable fluoropolymer, in the illustrated embodiment of the above-mentioned FEP.
  • the bridle 33 In the center of the stranding 32 formed from the wires 18, 19, 20 and 21 of the Grestrang (the bridle) 33 is arranged.
  • this conduit consists of a strand twisted, stretched and sintered, i. porous, tape made of PTFE.
  • the use of this material has in addition to the high cold flexibility of Drstranges invention the advantage that contamination by material removal due to the performed during operation of the line movements of the connected pivoting devices are avoided.
  • the stranded bandage 32 having said strands is surrounded by the banding 34 made of an insulating nonwoven fabric within which the stranding bandage 32 is performed extremely low friction. If, as shown, the insulating fiber fleece covered by the braid 35, for example, tinned copper wires, then the braid 35 can be easily moved over the stranding 32 in the axial direction for mounting purposes, but the insulating fiber fleece also contributes to increase the flexibility of the entire line.
  • the banding 36 is arranged to improve the shielding effect and to optimize the data transfer from a one or both sides coated with a metal, advantageously steamed fiber fleece.
  • the metals used are preferably aluminum, silver or other conductive materials suitable for the coating process.
  • the outer envelope of this line according to the invention is formed by the jacket 37 made of a silicone rubber.
  • the outer diameter of this data line according to the invention is about 4.8 mm, the operating voltage is according to their use in automotive technology at 48V.
  • the particular advantage of this line according to the invention is the problem-free use in a temperature range of about -50 ° C to + 135 ° C and above while maintaining high flexibility and undisturbed data transmission with a data rate of about 800 or 1000 Mbit / sec.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Insulated Conductors (AREA)
  • Communication Cables (AREA)
  • Organic Insulating Materials (AREA)

Description

Die vorliegende Erfindung betrifft eine hochflexible geschirmte elektrische Leitung zur hochfrequenten Datenübermittlung bei schwenkbaren Bildschirmen, insbesondere für schwenkbare LCD (Flüssigkristallanzeige) Einrichtungen, mit zwei Adern zur Stromversorgung und /oder mindestens zwei Datenadern.The present invention relates to a highly flexible shielded electrical line for high-frequency data transmission in pivotable screens, in particular for pivotable LCD (liquid crystal display) devices, with two wires for power and / or at least two data wires.

Um dem zunehmenden Bedürfnis nach Informationen unabhängig vom jeweiligen Standort des Interessierten Rechnung zu tragen, hat beispielsweise die Kraftfahrzeugindustrie seit langem im Fahrzeug integrierte Bildschirme entwickelt, mit deren Hilfe die unterschiedlichsten Daten sichtbar gemacht werden können, seien es Informationen über den Zustand des Kraftfahrzeugs selbst, über Telefonanschlüsse, über Radioprogramme oder über eine Routenplanung (Navigationssystem). Das gilt insbesondere auch für Kraftfahrzeuge, die der Personenbeförderung dienen. Nicht immer ist es jedoch möglich, beispielsweise auch in Kraftfahrzeugen kleinerer Bauart, die für eine Darstellung der Informationen benötigten Bildschirme im Fahrzeug raumfest zu installieren, sei es, dass der entsprechende Platzbedarf nicht ausreicht, sei es, dass der Aufstellungsort im Automobil nur eine kurzfristige Betrachtung erlaubt. In solchen Fällen ist es erforderlich, die Bildschirme schwenkbar im Fahrzeug zu installieren, damit die Bildschirme in beliebigen Richtungen geklappt, geschwenkt, gedreht oder aus ihrer Lageposition, beispielsweise auch aus einer Schublade, herausgezogen werden können, um sie in eine für den Betrachter geeignete Position zu bringen. Entsprechend hoch ist die mechanische Beanspruchung der zur Datenübermittlung an die Bildschirme angeschlossenen elektrischen Leitungen. Bei einer schwenkbaren Anordnung des Bildschirmes werden diese Leitungen gezogen, gereckt und verdreht, wobei einem Ziehen, einer Reckung und einer Verdrehung ohne Schaden für die elektrische Leitung sehr schnell Grenzen gesetzt sind, wenn die Umgebungstemperaturen sehr tiefe oder hohe Werte annehmen. So hat sich gezeigt, dass z.B. in Gebieten mit Dauerfrost die herkömmlichen Datenleitungen nicht geeignet sind, die Funktion des Bildschirmes zu gewährleisten. Die bei tiefen Temperaturen beispielsweise versteiften Datenleitungen erlauben weder ein Herausklappen noch ein Verdrehen des Bildschirmes, eine ungestörte Dateninformation ist also nicht mehr gegeben.In order to meet the increasing need for information regardless of the location of the interested parties, for example, the automotive industry has long developed in the vehicle integrated screens, with the help of a variety of data can be made visible, it is information about the state of the motor vehicle itself, about Telephone connections, over radio programs or over a route planning (navigation system). This applies in particular to motor vehicles used for passenger transport. However, it is not always possible, for example in motor vehicles of smaller design, to install the screens required for displaying the information in the vehicle in a fixed space, be it that the corresponding space requirement is insufficient, be it that the installation site in the automobile is only a short-term consideration allowed. In such cases, it is necessary to pivotally install the screens in the vehicle to allow the screens to be flipped, swiveled, rotated, or pulled out of position, such as from a drawer, to a position suitable for the viewer bring to. Accordingly high is the mechanical stress of the data transmission to the screens connected electrical lines. With a pivotal arrangement of the screen these lines are drawn, stretched and twisted, with a pull, a stretching and a twist without damage to the electrical line very quickly limits are set when the ambient temperatures are very low or high values. It has thus been found that e.g. in areas with permafrost the conventional data lines are not suitable to ensure the function of the screen. The stiffened at low temperatures, for example, data lines allow neither folding out nor twisting the screen, an undisturbed data information is no longer given.

Um hier weiter zu kommen, hat man bereits die verseilten und/oder gebündelten elektrischen Leiter einer hochflexiblen Leitung zur hochfrequenten Datenübermittlung mit einer Bandierung aus einer mit Aluminium beschichteten Isolierfolie umgeben, die ein umgebendes Drahtgeflecht von innen her kontaktiert ( DE 10 2006 036 621 A1 ). Die Übertragungsfrequenz bzw. die im Betrieb zu übertragende Datenrate einer solcher Leitung ist jedoch, wenn auch auf hohem Niveau, begrenzt, eine weitere Anhebung der Übertragungsfrequenz ist nicht möglich.To get ahead, you already have the stranded and / or bundled electrical conductors of a highly flexible line to the high-frequency Surrounding data transmission with a banding of an aluminum-coated insulating film, which contacts a surrounding wire mesh from the inside ( DE 10 2006 036 621 A1 ). However, the transmission frequency or the data rate to be transmitted during operation of such a line is limited, albeit at a high level, a further increase in the transmission frequency is not possible.

Das Dokument EP 1 768 133 A2 offenbart eine hochflexible geschirmte Leitung zur hoch Frequenten Daten Übermittlung bei schwenkbaren Bildschirmen.The document EP 1 768 133 A2 discloses a highly flexible shielded line for high frequency data transmission in pivotable screens.

Der vorliegenden Erfindung liegt daher die Aufgabe zugrunde, eine Datenleitung für die beschriebenen schwenkbaren Bildschirme vorzuschlagen, die bei hoher Flexibilität und weitestgehender Unabhängig von den herrschenden Umgebungstemperaturen die Funktion der Bildschirme bei optimierter Qualität der Datensignale den Datenempfang auch für hohe Datenraten in Bereichen von z.B. 800 Mbit/sec und mehr gewährleistet.The present invention is therefore based on the object of providing a data line for the described pivotable screens, which with high flexibility and largely independent of the prevailing ambient temperatures, the function of the screens with optimized quality of the data signals, the data reception even for high data rates in areas of e.g. 800 Mbit / sec and more guaranteed.

Gelöst wird diese Aufgabe gemäß der Erfindung dadurch, dass die verseilten und/oder gebündelten oder zu Paaren zusammengefassten Adern insgesamt von einer Abschirmung aus unisolierten metallischen Drähten umschlossen sind, die nach Außen von einem leitfähigen Faservlies abgedeckt ist, das die Abschirmung umflächig elektrisch kontaktiert, und dass die Faservliesabdeckung schließlich von einem Außenmantel aus einem Silikonkautschuk umschlossen ist. Dieser Aufbau einer elektrischen Datenleitung gewährleistet die Schwenkbarkeit eines Bildschirmes in beliebige Richtungen selbst unter Permafrost Bedingungen bei gleichzeitiger ungestörter Datenübermittlung mit hoher Datenrate von 800 oder 1000 MHz und darüber. Ein mit einer Leitung nach der Erfindung verbundener Bildschirm kann demnach ohne Beeinträchtigung der Übertragungsqualität der jeweiligen Daten nach vorn oder nach hinten geklappt, in die eine oder andere Richtung gedreht oder geschwenkt oder in Richtung des Betrachters gezogen oder von diesem wieder wegbewegt werden.This object is achieved according to the invention, characterized in that the stranded and / or bundled or combined into pairs cores are enclosed in total by a shield of uninsulated metallic wires, which is covered to the outside by a conductive fiber fleece, the surface electrically contacted the shield, and that the nonwoven cover is finally enclosed by an outer shell of a silicone rubber. This structure of an electrical data line ensures the pivotability of a screen in any direction even under permafrost conditions with simultaneous undisturbed data transmission at a high data rate of 800 or 1000 MHz and above. A connected to a line according to the invention screen can therefore be folded without affecting the quality of transmission of the respective data forward or backward, rotated in one or the other direction or pivoted or pulled in the direction of the viewer or moved away from it again.

Das leitfähige Faservlies nach der Erfindung kann ein mit leitfähigen Werkstoffen imprägniertes Kunststoffvlies sein, aber auch ein mit Metallfäden durchwirktes Vliesmaterial. Eine bevorzugte Variante der Erfindung ergibt sich jedoch dann, wenn das leitfähige Faservlies ein mit Metall beschichtetes Kunststoffvlies ist, wobei die Beschichtung vorzugsweise durch eine Bedampfung des Kunststoffvlieses erfolgt, durch eine Bedampfung z.B. mit Aluminium oder auch mit Silber oder mit deren Legierungen.The conductive nonwoven fabric according to the invention may be a nonwoven material impregnated with conductive materials, but also a nonwoven material impregnated with metal threads. However, a preferred variant of the invention results when the conductive nonwoven fabric is a metal-coated plastic nonwoven, wherein the coating is preferably carried out by a vapor deposition of the plastic nonwoven, by a vapor deposition, for example with aluminum or silver or with their alloys.

Nach einem weiteren Erfindungsgedanken sind die verseilten und/oder gebündelten oder zu Paaren zusammengefassten Adern insgesamt von einem unterhalb des Drahtgeflechtes angeordneten isolierenden Faservlies zusammengehalten. Dieses isolierende Faservlies führt zu einer weiteren Verminderung der Reibungsverluste im Leitungsaufbau und damit zur Steigerung der Flexibilität der erfindungsgemäßen elektrischen Leitung.According to a further concept of the invention, the stranded and / or bundled or combined in pairs cores are held together in total by a arranged below the wire mesh insulating fiber fleece. This insulating nonwoven fabric leads to a further reduction of the friction losses in the line structure and thus to increase the flexibility of the electrical line according to the invention.

Neben der verbesserten Abschirmung durch das erfindungsgemäße leitfähige Faservlies trägt zur Erhöhung der Übertragungsfrequenzen auch bei, dass die Isolierung der Datenadern zweischichtig aufgebaut ist, mit einer inneren Bewicklung des Leiters aus einem gereckten und gesinterten porösen Band oder einer Folie aus einem aus der Schmelze nicht verarbeitbaren Fluorpolymer sowie einer äußeren geschlossenen Schicht aus einem aus der Schmelze verarbeitbaren Fluorpolymer. Das aus der Schmelze nicht verarbeitbare Fluorpolymer ist mit besonderem Vorteil ein Polytetrafluorethylen, wobei die Bezeichnung Polytetrafluorethylen auch Tetrafluorethylen - Polymere beinhaltet, die mit modifizierenden Zusätzen versehen sind, jedoch in einer solchen Menge, dass das Polymere, wie das Polytetrafluorethylen selbst, aus der Schmelze nicht verarbeitbar ist.In addition to the improved shielding by the conductive nonwoven fabric according to the invention contributes to increase the transmission frequencies also in that the insulation of the data wires is constructed in two layers, with an inner winding of the conductor of a stretched and sintered porous tape or a film of a non-melt processable from the melt fluoropolymer and an outer closed layer of a melt processable fluoropolymer. The melt non-processable fluoropolymer is most preferably a polytetrafluoroethylene, the term polytetrafluoroethylene also including tetrafluoroethylene polymers provided with modifying additives, but in such an amount that the polymer, such as the polytetrafluoroethylene itself, does not melt is processable.

Diese Ausführungsform der Erfindung weist nicht nur die hohe Flexibilität bei dynamischer Verlegung über einen weiten Temperaturbereich zwischen -50°C und +180°C auf, sie ist auch problemlos geeignet für eine Übertragungsfrequenz über 800 und 1000 MHz bei einer Schirmdämpfung größer 65dB. Eine weitere Verbesserung dieser Datenleitung ergibt sich dann, wenn in Weiterführung der Erfindung die PTFE (Polytetrafluorethylen) Bewicklung des Leiters eine mindestens mit der obersten Band - oder Folienlage kraftschlüssig verbundene Schicht aus einem aus der Schmelze verarbeitbaren Fluorpolymer trägt. Da das Verhältnis der Wanddicken von Band - oder Folienbewicklung zur kraftschlüssig verbundenen Schicht in Durchführung der Erfindung 3:1 beträgt, ist diese Schicht lediglich als eine die Bewicklung abdeckende Skin-Schicht anzusehen. Als geeignet für diese Skin-Schicht haben sich beispielsweise das Tetrafluorethylen/Hexafluorpropylen Copolymer (FEP), das Perfluoralkoxy-Polymer (PFA) oder auch das Tetrafluorethylen-Perfluoralkylvinylether Copolymerisat (TFA/PFA) erwiesen. Aber auch andere bekannte, aus der Schmelze verarbeitbare, Fluorpolymere können mitunter eine vorteilhafte Anwendung finden.This embodiment of the invention not only has the high flexibility in dynamic laying over a wide temperature range between -50 ° C and + 180 ° C, it is also easily suitable for a transmission frequency over 800 and 1000 MHz with a screen attenuation greater than 65dB. A further improvement of this data line results when, in a continuation of the invention, the PTFE (polytetrafluoroethylene) winding of the conductor carries a layer of a melt-processable fluoropolymer, which is frictionally connected to at least the uppermost band or film layer. Since the ratio of the wall thicknesses of the tape or film winding to the frictionally connected layer in the practice of the invention is 3: 1, this layer is merely to be regarded as a skin layer covering the winding. For example, the tetrafluoroethylene / hexafluoropropylene copolymer (FEP), the perfluoroalkoxy polymer (PFA) or else the tetrafluoroethylene-perfluoroalkylvinyl ether copolymer (TFA / PFA) have proven to be suitable for this skin layer. However, other known melt-processable fluoropolymers can sometimes find a beneficial application.

Eine besonders vorteilhafte Ausführungsform der Erfindung ergibt sich dann, wenn neben den zur Datenübermittlung vorgesehenen Einzeladern im Leitungsaufbau zusätzliche Adern zur Stromversorgung angeordnet sind. Eine solche Stromversorgung benötigen beispielsweise die Verstellmotoren an Schwenkdisplays oder die Antriebsmotoren für Spiegelverstellungen in bzw. an Kraftfahrzeugen. Die elektrischen, den Speisestrom führenden Leiter dieser Adern tragen zweckmäßig eine Isolierung aus einem aus der Schmelze verarbeitbaren Fluorpolymer.A particularly advantageous embodiment of the invention results when, in addition to the individual wires provided for data transmission, additional wires for the power supply are arranged in the line construction. Such a power supply, for example, require the adjusting motors on swivel displays or the drive motors for mirror adjustments in or on motor vehicles. The electrical, the feed current leading conductors of these wires expediently carry insulation from a processable from the melt fluoropolymer.

Vorteilhaft ist es ferner, wenn nach der Erfindung die Adern für die Stromversorgung und die Datenadern den gleichen oder doch nahezu gleichen Durchmesser aufweisen. So lassen sich alle Adern problemlos gleichzeitig zu einem einheitlichen Verseilverband vereinigen. Dabei ist sichergestellt, dass alle Adern bei Biegebeanspruchungen ein gleiches Biegeverhalten aufweisen. Wird zur Rundung der aus den verseilten Adern bestehenden Seele ein zentraler Füllstrang, eine sog. Trense, benötigt, dann hat es sich in Weiterführung der Erfindung als besonders zweckmäßig erwiesen, den Füllstrang aus einem gereckten und gesinterten Formstrang aus Polytetrafluorethylen (PTFE) herzustellen. Der Formstrang besteht vorteilhaft aus einem zu einem Strang verdrehten Band aus PTFE. Der Vorteil eines solchen Formstranges ist seine hohe Kälteflexibilität sowie der fehlende Materialabrieb, der, wie im Falle von Glasseidentrensen, leicht zu Verschmutzungen der elektronischen Bauelemente bei den schwenkbaren LCD Einrichtungen führt.It is also advantageous if according to the invention, the wires for the power supply and the data wires have the same or almost the same diameter. This makes it easy to unify all the wires simultaneously to form a single stranded bandage. This ensures that all cores have the same bending behavior under bending stresses. If a central filling strand, a so-called bridle, is required for rounding the core consisting of the stranded cores, then it has proven to be especially expedient to produce the filler strand from a stretched and sintered polytetrafluoroethylene (PTFE) strand molding. The molded strand is advantageously made of a twisted to a strand band of PTFE. The advantage of such a molded strand is its high cold flexibility and the lack of material abrasion, which, as in the case of glass silk tents, easily leads to contamination of the electronic components in the pivotable LCD devices.

Der weite Temperaturbereich beim Einsatz der Datenleitung nach der Erfindung verlangt einen geeigneten Mantelwerkstoff. Hier hat es sich in Durchführung der Erfindung als vorteilhaft erwiesen, wenn der Außenmantel aus einem heißvulkanisierenden Silikonkautschuk, einem sog. HTV Silikonkautschuk, hergestellt ist. Eine andere vorteilhafte Möglichkeit ist die, als Mantelwerkstoff einen LSR (Liquid Silicon Rubber) Kautschuk zu wählen.The wide temperature range when using the data line according to the invention requires a suitable sheath material. Here it has proved to be advantageous in carrying out the invention, when the outer jacket of a Heißvulkanisierenden silicone rubber, a so-called. HTV silicone rubber, is produced. Another advantageous option is to choose a LSR (Liquid Silicon Rubber) rubber as the sheath material.

Die Erfindung sei an Hand der in den Fig. 1 bis 3 als Ausführungsbeispiele dargestellten Datenleitungen näher erläutert. Die hier beschriebenen elektrischen Leitungen sind aufgrund ihrer besonderen Eigenschaften für die Niederspannungs / Hochgeschwindigkeits-Datenübertragung über Kupferdrähte (LVDS) geeignet.The invention is on hand in the Fig. 1 to 3 explained as embodiments data lines explained in more detail. The electrical leads described here are suitable for low voltage / high speed data transmission over copper wires (LVDS) due to their particular characteristics.

Die Fig.1 zeigt eine ein-paarige geschirmte, hochflexible Datenleitung für eine EMVoptimierte Übertragung von Daten (LVDS-interface) mit extrem hoher Biegewechselfähigkeit über einen weiten Temperaturbereich, wie sie insbesondere in der Kraftfahrzeugtechnik für den Anschluss von schwenkbaren Bildschirmen vorteilhaft verwendet werden kann. Hierbei sind die Kupferleiter 1 mit einem Durchmesser von z.B. 0,50 mm mit einer Bewicklung 2 aus einem gereckten und gesinterten Band bzw. einer entsprechenden Folie aus Polytetrafluorethylen (PTFE) isoliert, das oder die unter dem Handelsnamen HEI-tape® der Anmelderin bekannt ist. Die Bewicklung 2 aus dem PTFE-Band trägt eine Skin-Schicht 3 aus einem aus der Schmelze verarbeitbaren Fluorpolymer, beispielsweise aus einem Tetrafluorethylen/Hexafluorpropylen Copolymer (FEP). Füllstränge 4 in den Zwickeln der verseilten Einzeladern dienen der Stabilisierung des Verseilverbandes, sie können aus einem geeigneten Kunststoff hergestellt sein, aber auch aus Glasfasern bestehen. Der die genannten Einzelelemente aufweisende Verseilverband 5 ist umschlossen von der Bandierung 6 aus einem isolierenden Faservlies. Ein aus verzinnten Kupferdrähten bestehendes Schirmgeflecht ist mit 7 bezeichnet, es wird überdeckt von der Bandierung 8 aus einem ein- oder beidseitig mit Aluminium oder Silber bedampftes Faservlies. Die äußere Umhüllung der erfindungsgemäßen Datenleitung bildet der Mantel 9 aus einem heißvulkanisierenden (HTV) Silikonkautschuk. Der Außendurchmesser dieser entsprechend der Erfindung aufgebauten Datenleitung beträgt etwa 4,5 mm, die Betriebsspannung entsprechend ihrem Einsatz in der Kraftfahrzeugtechnik 48V.The Fig.1 shows a single-pair shielded, highly flexible data line for an EMC optimized transmission of data (LVDS-interface) with extremely high bending flexibility over a wide temperature range, as in particular can be used advantageously in the automotive technology for the connection of swivel screens. Here, the copper conductors 1 are insulated with a diameter of, for example, 0.50 mm with a winding 2 of a stretched and sintered tape or a corresponding sheet of polytetrafluoroethylene (PTFE), or the known under the trade name HEI-tape® the applicant , The winding 2 of the PTFE tape carries a skin layer 3 made of a melt processable fluoropolymer, for example, a tetrafluoroethylene / hexafluoropropylene copolymer (FEP). Fill strands 4 in the interstices of the stranded individual cores serve to stabilize the stranding, they can be made of a suitable plastic, but also consist of glass fibers. The stranding 5 having said individual elements is enclosed by the bandage 6 made of an insulating fiber fleece. An existing of tinned copper wires screen braid is denoted by 7, it is covered by the band 8 of a one or both sides with aluminum or silver steamed fiber fleece. The outer envelope of the data line according to the invention forms the jacket 9 of a Heißvulkanisierenden (HTV) silicone rubber. The outer diameter of this constructed according to the invention data line is about 4.5 mm, the operating voltage according to their use in automotive technology 48V.

Entsprechend den Forderungen, die an solche Datenleitungen gestellt werden, ist auch eine Ausführungsform der Erfindung nach der Fig. 2 einzusetzen. Bei dieser Datenleitung sind vier Paare 10 zu einem Verseilverband 11 zusammengefasst. Die elektrischen Leiter 12 der Paare 10 mit einem Aüßendurchmesser von z.B. 0,6 mm bestehen in dieser Ausführungsform aus blanken, verzinnten oder versilberten Kupferdrähten. Die Isolierung 13 der Leiter 12 besteht aus einem aus der Schmelze verarbeitbaren oben genannten Fluorpolymer, beispielsweise aus einem FEP. Die alle vier Paare gemeinsam umfassende Bandierung 14 kann aus einer Folienbewicklung aus einem Polyesterband bestehen, entsprechend dem Ausführungsbeispiel nach der Fig.1 kann aber auch hier mit Vorteil ein isolierendes, reibungsminderndes Faservlies die Aufgabe der Bandierung übernehmen. Der Abschirmung der Datenleitung dient das aus verzinnten oder versilberten Kupferdrähten bestehende Geflecht 15, das seinerseits zur Verbesserung der Schirmwirkung und damit zur Optimierung der Datenübertragung von der Bandierung 16 aus einem metallisierten Faservlies umgeben ist. Abgeschlossen nach Außen wird die erfindungsgemäße Datenleitung durch den Mantel 17, beispielsweise aus einem HTV Silikonkautschuk oder aus einem LSR Kautschuk.According to the demands placed on such data lines, an embodiment of the invention according to the Fig. 2 use. In this data line four pairs 10 are combined into a stranding 11. The electrical conductors 12 of the pairs 10 with an outer diameter of, for example, 0.6 mm in this embodiment consist of bare, tinned or silver-plated copper wires. The insulation 13 of the conductor 12 consists of a melt-processable above-mentioned fluoropolymer, for example, an FEP. The all four pairs together comprehensive banding 14 may consist of a Folienbewicklung of a polyester tape, according to the embodiment of the Fig.1 but can also take over the task of banding with advantage an insulating, friction-reducing fiber fleece. The shielding of the data line is made of tinned or silver-plated copper wires existing mesh 15, which in turn is surrounded to improve the shielding effect and thus to optimize the data transfer from the banding 16 of a metallized nonwoven fabric. Completed to the outside, the data line according to the invention through the jacket 17, for example, from a HTV silicone rubber or LSR rubber.

Der auch bei tiefen Temperaturen gleichbleibend flexible Silikonkautschukmantel sichert auch hier im Zusammenhang mit den beschriebenen Aufbauelementen der Datenleitung ihre hohe Biegewechselfähigkeit, die eine dynamische Verlegungsart bei schwenkbaren oder aus Schubladen oder Abdeckungen herausziebaren Bildschirmen gestattet. Bei dieser Ausführungsform der elektrischen Leitung liegt der Außendurchmesser bei etwa 6,0 bis 6,5 mm, die Betriebsspannung beträgt ebenfalls 48V.The uniformly flexible even at low temperatures silicone rubber sheath ensures here in connection with the described elements of the data line their high bending ability, which allows a dynamic Verlegungsart swivel or herausziebaren from drawers or covers screens. In this embodiment of the electrical line, the outer diameter is about 6.0 to 6.5 mm, the operating voltage is also 48V.

In Anlehnung an die Fig. 1 zeigt die Fig. 3 eine besonders vorteilhafte Ausführungsform der Erfindung, bei der die beiden zur Datenübermittlung vorgesehenen Einzeladern 18 und 19 und die beiden mindestens annähernd den gleichen Durchmesser wie diese aufweisenden Adern 20 und 21, die der Stromversorgung z.B. von Stellmotoren bei schwenkbaren Bildschirmen dienen, miteinander verseilt sind. Da die Adern 20 und 21 nicht zur Datenübermittlung verwendet werden, sind deren elektrische Leiter 22 und 23 lediglich mit einer Isolierung 24 bzw. 25 aus einem aus der Schmelze verarbeitbaren Fluorpolymer, beispielsweise aus einem FEP, versehen.
Für die Datenübertragung kommt es dagegen auf eine Isolierung mit einer geringen Dielektrizitätskonstanten an, z.B. in der Größenordnung von 1,3. Aus diesem Grunde sind die Leiter 26 und 27 der Einzeladern 18 und 19 zunächst mit einer Bewicklung 28 bzw. 29 aus einem gereckten und gesinterten Band bzw. aus einer entsprechenden Folie aus Polytetrafluorethylen isoliert. Diese Band- oder Folienwicklungen werden jeweils überdeckt von Isolierschichten 30 und 31 aus einem schmelzfähigen Fluorpolymer, im dargestellten Ausführungsbeispiel aus dem bereits oben erwähnten FEP.Based on the Fig. 1 show the Fig. 3 a particularly advantageous embodiment of the invention, in which the two provided for data transmission single cores 18 and 19 and the two at least approximately the same diameter as these having cores 20 and 21, which serve the power supply, for example, servomotors with pivotable screens, are stranded together. Since the wires 20 and 21 are not used for data transmission, their electrical conductors 22 and 23 are provided only with an insulation 24 or 25 made of a melt-processable fluoropolymer, for example from a FEP.
For data transmission, on the other hand, insulation with a low dielectric constant, for example in the order of magnitude of 1.3, is important. For this reason, the conductors 26 and 27 of the individual wires 18 and 19 are first insulated with a winding 28 or 29 from a stretched and sintered band or from a corresponding film of polytetrafluoroethylene. These tape or film windings are each covered by insulating layers 30 and 31 of a meltable fluoropolymer, in the illustrated embodiment of the above-mentioned FEP.

Im Zentrum des aus den Adern 18, 19, 20 und 21 gebildeten Verseilverbandes 32 ist der Füllstrang (die Trense) 33 angeordnet. Zur Erhöhung der Flexibilität dieser Leitung auch bei extrem tiefen Temperaturen, beispielsweise bis zu - 50° C, besteht er (sie) aus einem zum Strang verdrehten, gereckten und gesinterten, d.h. porösen, Band aus PTFE. Der Einsatz dieses Materials hat neben der hohen Kälteflexibilität des erfindungsgemäßen Füllstranges den Vorteil, dass Verschmutzungen durch Materialabtrag aufgrund der im Betrieb der Leitung durchzuführenden Bewegungen der angeschlossenen schwenkbaren Einrichtungen vermieden sind.In the center of the stranding 32 formed from the wires 18, 19, 20 and 21 of the Füllstrang (the bridle) 33 is arranged. To increase the flexibility of this conduit even at extremely low temperatures, for example up to -50 ° C, it consists of a strand twisted, stretched and sintered, i. porous, tape made of PTFE. The use of this material has in addition to the high cold flexibility of Füllstranges invention the advantage that contamination by material removal due to the performed during operation of the line movements of the connected pivoting devices are avoided.

Der die genannten Adern aufweisende Verseilverband 32 ist umgeben von der Bandierung 34 aus einem isolierenden Faservlies, innerhalb der der Verseilverband 32 extrem reibungsarm geführt ist. Wird, wie dargestellt, das isolierende Faservlies überdeckt von dem Schirmgeflecht 35 z.B. aus verzinnten Kupferdrähten, dann lässt sich das Schirmgeflecht 35 zu Montagezwecken leicht über dem Verseilverband 32 in Achsrichtung verschieben, das isolierende Faservlies trägt aber auch zur Steigerung der Flexibilität der gesamten Leitung bei. Über dem Schirmgeflecht 35 ist zur Verbesserung der Abschirmwirkung und zur Optimierung des Datentransfers die Bandierung 36 aus einem ein- oder beidseitig mit einem Metall beschichtetes, vorteilhaft bedampftes Faservlies angeordnet. Als Metalle dienen vorzugsweise Aluminium, Silber oder andere für den Beschichtungsvorgang geeignete leitfähige Materialien. Die äußere Umhüllung dieser erfindungsgemäßen Leitung wird gebildet durch den Mantel 37 aus einem Silikonkautschuk. Der Außendurchmesser dieser Datenleitung nach der Erfindung beträgt etwa 4,8 mm, die Betriebsspannung liegt entsprechend ihrem Einsatz in der Kraftfahrzeugtechnik bei 48V. Der besondere Vorteil dieser Leitung nach der Erfindung ist der problemlose Einsatz in einem Temperaturbereich von etwa -50° C bis +135° C und darüber bei gleichbleibender hoher Flexibilität sowie einer ungestörten Datenübertragung mit einer Datenrate von über 800 oder 1000 Mbit/sec.The stranded bandage 32 having said strands is surrounded by the banding 34 made of an insulating nonwoven fabric within which the stranding bandage 32 is performed extremely low friction. If, as shown, the insulating fiber fleece covered by the braid 35, for example, tinned copper wires, then the braid 35 can be easily moved over the stranding 32 in the axial direction for mounting purposes, but the insulating fiber fleece also contributes to increase the flexibility of the entire line. Over the shielding braid 35, the banding 36 is arranged to improve the shielding effect and to optimize the data transfer from a one or both sides coated with a metal, advantageously steamed fiber fleece. The metals used are preferably aluminum, silver or other conductive materials suitable for the coating process. The outer envelope of this line according to the invention is formed by the jacket 37 made of a silicone rubber. The outer diameter of this data line according to the invention is about 4.8 mm, the operating voltage is according to their use in automotive technology at 48V. The particular advantage of this line according to the invention is the problem-free use in a temperature range of about -50 ° C to + 135 ° C and above while maintaining high flexibility and undisturbed data transmission with a data rate of about 800 or 1000 Mbit / sec.

Claims (22)

  1. Highly flexible shielded electrical line for highfrequency data transmission in swivellable visual display units, in particular for swivellable LCD devices, having two current supply wires (20,21) and/or at least two data wires (1,12,18,19), characterised in that
    the wires, which are twisted and/or bundled or gathered in pairs (10), are enclosed altogether by a shielding (7,15,35) of uninsulated metallic wires, which are covered towards the outside by a conductive non-woven fabric (8,16,36) electrically contacting the shielding circumferentially, and in that finally this conductive non-woven fabric covering is enclosed by an outer sheath (9,17,37) made of a silicone rubber.
  2. Electrical line according to Claim 1,
    characterised in that
    the conductive non-woven fabric (8,16,36) is a plastic non-woven fabric impregnated with conductive materials.
  3. Electrical line according to Claim 1,
    characterised in that
    the conductive non-woven fabric (8,16,36) is a plastic non-woven fabric interwoven with metallic threads.
  4. Electrical line according to Claim 1,
    characterised in that
    the conductive non-woven fabric (8,16,36) is a plastic non-woven fabric coated with metal.
  5. Electrical line according to Claim 4,
    characterised in that
    the conductive non-woven fabric (8,16,36) is a plastic non-woven fabric (8,16,36) coated with metal on one or both sides by vapour deposition.
  6. Electrical line according to Claim 3 or one of the subsequent claims,
    characterised in that
    the metal is aluminium or an aluminium alloy.
  7. Electrical line according to Claim 3 or one of the subsequent claims,
    characterised in that
    the metal is silver or a silver alloy.
  8. Electrical line according to Claim 1 or one of the subsequent claims,
    characterised in that
    the outer conductive non-woven fabric covering (8,16,36) of the shielding (7,15,35) is composed of a wound tape of the conductive non-woven fabric.
  9. Electrical line according to Claim 1 or one of the subsequent claims,
    characterised in that
    the wires, which are twisted and/or bundled or gathered in pairs (10), are all held together by an insulating non-woven fabric (6,14,34) arranged below the wire mesh.
  10. Electrical line according to Claim 1 or one of the subsequent claims,
    characterised in that
    the insulation of the wires is of two-layered construction, with an inner wrapping of the conductor being composed of a stretched and sintered porous tape (2,28,29) or a film of non-melt-processable fluoropolymer, and an outer sealed layer (3,30,31) of a melt-processable fluoropolymer.
  11. Electrical line according to Claim 10,
    characterised in that
    the non-melt-processable fluoropolymer is a polytetrafluoroethylene.
  12. Electrical line according to Claim 10,
    characterised in that
    the outer sealed layer (3,30,31) is non-positively connected to at least the uppermost tape or film layer of the inner wrapping.
  13. Electrical line according to Claim 1 or one of the subsequent claims,
    characterised in that
    the insulation (24,25) of the current supply wires (20,21) is made of a melt-processable fluoropolymer.
  14. Electrical line according to Claim 1 or one of the subsequent claims, having a central filling strand (snaffle) (33), around which the single wires or pairs are twisted,
    characterised in that
    the filling strand (33) is composed of a stretched and sintered shaped strand made of polytetrafluoroethylene.
  15. Electrical line according to Claim 14,
    characterised in that
    the stretched and sintered shaped strand is composed of a tape made of polytetrafluoroethylene twisted into a strand.
  16. Electrical line according to Claim 10 or one of the subsequent claims,
    characterised in that
    the ratio of the wall thickness of the tape or film wrapping to the non-positively connected sealed layer is approximately 3:1.
  17. Electrical line according to Claim 1 or one of the subsequent claims,
    characterised in that
    the diameter of the current supply wires (20,21) and the diameter of the data wires (18,19) is kept identical, or almost identical.
  18. Electrical wire according to Claim 1 or one of the subsequent claims,
    characterised in that
    the current supply wires (20,21) and the data wires (18,19) are twisted together at the same time.
  19. Electrical line according to Claim 1 or one of the subsequent claims,
    characterised in that
    the outer sheath (9,17,37) of the line is a high-temperature-vulcanising (HTV) silicone rubber.
  20. Electrical line according to Claim 1 or one of the subsequent claims,
    characterised in that
    the outer sheath (17) of the line is an LSR (Liquid Silicone Rubber) rubber.
  21. Electrical line according to Claim 10 or one of the subsequent claims,
    characterised in that
    the electrical line shielded by the conductive non-woven fabric (8,16,36), in which line the non-melt-processable fluoropolymer is a polytetrafluoroethylene, polytetrafluoroethylene also including tetrafluoroethylene polymers which are provided with modifying additives in such a quantity that the polymer is non-melt-processable, has in the dynamic state a high flexibility at temperatures from -50° to +180°C at a data rate to be transmitted of >800 Mbit/sec.
  22. Use of the electrical line according to Claim 1 or one of the subsequent claims for low-voltage/high-speed data transmission via copper wires (LVDS)
EP08012284.9A 2007-09-05 2008-07-08 Extremely flexible shielded electric data conductor Not-in-force EP2034491B9 (en)

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US20090056972A1 (en) 2009-03-05
EP2034491B9 (en) 2013-11-06
EP2034491A3 (en) 2012-04-11
DE102007041981A1 (en) 2009-03-12

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