WO2021023759A1 - Flexible, electrical flat ribbon cable and coil spring cassette with a flat ribbon cable of this kind - Google Patents

Flexible, electrical flat ribbon cable and coil spring cassette with a flat ribbon cable of this kind Download PDF

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Publication number
WO2021023759A1
WO2021023759A1 PCT/EP2020/071967 EP2020071967W WO2021023759A1 WO 2021023759 A1 WO2021023759 A1 WO 2021023759A1 EP 2020071967 W EP2020071967 W EP 2020071967W WO 2021023759 A1 WO2021023759 A1 WO 2021023759A1
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WO
WIPO (PCT)
Prior art keywords
ribbon cable
electrically conductive
electrical
coupling surface
flexible
Prior art date
Application number
PCT/EP2020/071967
Other languages
German (de)
French (fr)
Inventor
Raphael KLEINE
Knut Moldenhauer
Guido PASCHMANN
Original Assignee
Kostal Automobil Elektrik Gmbh & 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.)
Filing date
Publication date
Application filed by Kostal Automobil Elektrik Gmbh & Co. Kg filed Critical Kostal Automobil Elektrik Gmbh & Co. Kg
Publication of WO2021023759A1 publication Critical patent/WO2021023759A1/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
    • H01B7/08—Flat or ribbon cables
    • H01B7/0838—Parallel wires, sandwiched between two insulating layers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G11/00—Arrangements of electric cables or lines between relatively-movable parts
    • H02G11/02—Arrangements of electric cables or lines between relatively-movable parts using take-up reel or drum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B60R16/023—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems
    • B60R16/027—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems between relatively movable parts of the vehicle, e.g. between steering wheel and column
    • 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
    • H01B7/02—Disposition of insulation
    • H01B7/0233—Cables with a predominant gas dielectric
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/08—Flat or ribbon cables
    • H01B7/0861—Flat or ribbon cables comprising one or more screens

Definitions

  • the invention relates to a flexible, electrical flat ribbon cable with at least one electrical conductor, which is arranged between two insulating cover foils, a flat, electrically conductive layer being applied as a coupling surface on the outside of at least one of the two cover foils.
  • the invention relates to a coil spring cassette with such a ribbon cable, wherein the coil spring cassette comprises a stationary, cylindrical stator housing part, and a cylindrical rotor housing part arranged coaxially to this and rotatable about its longitudinal axis, with a through the outer jacket surface of the inner housing part and the inner jacket surface of the outer housing part limited winding gap is formed in which the flexible flat cable is arranged.
  • Flexible, electrical flat ribbon cables of the type mentioned at the beginning consist of one or more electrical conductor (s) arranged essentially parallel to one another, which is / are arranged between two insulating cover foils.
  • the cover films are usually connected to one another by an adhesive and thus enclose the electrical conductors between them. If at least two of them are present, the electrical conductors are spaced from one another and insulated from one another by the adhesive and / or the cover films.
  • the electrical conductors can be designed as mostly rectangular or square copper conductors in cross-section or have been applied to one of the two cover foils by means of a printing process.
  • Such flexible, electrical flat ribbon cables are used in particular in applications in which only a small amount of installation space is available.
  • Flexible, electrical ribbon cables are also used, for example, in devices in which two mutually movable elements are in electrical connection with one another, as is the case, for example, with a coil spring cassette of a motor vehicle.
  • a coil spring cassette comprises a rotor connected non-rotatably to the steering spindle and a stator connected to the casing tube and is used to establish an electrical connection between the stator-side electrical system and the electrical / electronic components integrated in a steering wheel.
  • the ribbon cable is wound either in one winding direction or with the formation of a U-shaped bend so that several turns of the steering wheel are possible.
  • the ribbon cable used must be designed to be particularly flexible, particularly in the case of the last-mentioned version, also referred to as the U-turn principle.
  • Such coil spring cassettes are provided, for example, in order to be able to securely transmit energy and / or data in motor vehicles between connection points that are rotatably held in the steering wheel and that are stationary in the area of the steering column.
  • Via the connection points of such a device for example, an airbag system, a steering wheel heater, a switching device, etc. can be supplied with the voltage and signals necessary for its function.
  • the increasing scope of electronic functions in the steering wheel creates the need for fast and interference-free data transmission via a coil spring cassette. However, this is only possible to a limited extent due to the geometry of the flat cables currently in use. For fast data transmission, a line system with an impedance that is matched to the impedance of the supply lines used is necessary.
  • Flat ribbon cables with at least one electrical conductor and at least one so-called coupling surface are used for data transmission.
  • This coupling surface usually covers the entire surface of an outer side of the ribbon cable.
  • Such ribbon cables with a suitable impedance of 100 ohms are certainly available, but they are unsuitable for use in a coil spring cassette according to the U-turn principle described above, since they are too stiff due to the thickness of the insulating cover films required to achieve the desired impedance are.
  • the ribbon cable In order to enable the ribbon cable to be bent in a U-shape, at least with a radius that is as small as is required in a winding gap that is usually available, the ribbon cable needs to be more flexible. Simply reducing the thickness of the insulating cover film in order to achieve the required flexibility is not expedient, however, since this increases the capacitive coating of the ribbon cable and thus reduces its impedance accordingly.
  • the electrical ribbon cable according to the present invention has the advantage over the prior art of having the flexibility required for use in a coil spring cassette according to the U-turn principle and at the same time providing an impedance suitable for fast data transmission.
  • this “target” impedance is 100 Ohm, for example.
  • this is achieved in that, while maintaining the geometry of the electrical ribbon cable and the material of the insulating cover films, measures are taken to reduce the capacitance per unit length of the capacitor formed by the electrical conductor and the coupling surface.
  • the reduction in the capacitance per unit length of the capacitor formed by the electrical conductor and the coupling surface is preferably carried out by taking measures to reduce the effective relative dielectric constant and / or the effective capacitor surface.
  • a reduction in the effective relative dielectric constant is achieved by perforating at least one of the insulating cover foils.
  • a reduction in the effective capacitor area is advantageously achieved by perforations in the electrically conductive layer acting as the coupling area, or by the fact that this coupling area is formed by an electrically conductive paste with a low fill factor of metal particles or by a layer vapor-deposited in the PVD process .
  • FIG. 1 shows a cross section of a ribbon cable according to the invention 2: an embodiment of a flat ribbon cable according to the invention in a three-dimensional view
  • Fig. 3 a coil spring cassette with an inventive
  • a ribbon cable 1 comprises at least one electrical conductor 2. Designs with a plurality of electrical conductors arranged essentially parallel to one another are also possible. Since the properties of the ribbon cable that are essential to the invention can already be realized with just one electrical conductor, this simplest embodiment is assumed below without restricting the idea to it.
  • the electrical conductor 2 is arranged between two insulating cover films 3, 4 which are connected to one another and to the electrical conductor 2 by an adhesive and thus enclose the electrical conductor 2 between them.
  • the electrical conductor is designed as a copper conductor with a mostly rectangular cross section or has been applied to one of the two cover foils 3, 4 by means of a printing process.
  • An electrically conductive layer is applied to the outside of at least one of the two insulating cover films 4. This electrically conductive layer fulfills the function of a so-called coupling surface 5 and generally covers the outside of the flat ribbon cable over the entire surface.
  • the electrical properties of such a flat ribbon cable are essentially determined by the geometry of the cable and the specific electrical properties of the materials used.
  • the line impedance of the ribbon cable which is decisive here, is inversely proportional to the root of the capacitive coating of the same, which in turn depends on the dielectric constant of the insulating material, as well as on the size and the distance between the opposing electrically conductive surfaces.
  • the thickness of the insulating cover foils 3, 4 of the same is reduced to such an extent that its flexibility is sufficient to enable a U-shaped bend in a winding gap of a coil spring cassette. This allows the impedance to drop from 100 ohms to around 50 ohms.
  • the material used for the insulating cover films 3, 4, which in the present case is PET, should be retained for reasons of its mechanical properties.
  • the width of the electrical conductor 2 within the ribbon cable 1, and thus the decisive dimension for determining the area A of the capacitance described, cannot be reduced below a minimum of 0.2 mm in this case for mechanical reasons, at least at the present time.
  • the present invention proposes measures to "simulate" effective dielectric constants s r 'and effective areas A' that achieve the desired effects.
  • a perforation of the insulating cover sheets 3, 4 is provided as such a measure. This means the introduction of small holes in these foils, which, as has been shown, change the mechanical properties of the foils only to a small extent, but the effective dielectric constant s r 'can be reduced noticeably compared to the purely material-related relative dielectric constant s r .
  • the coupling surface which is formed e.g. by a thin aluminum foil, can be provided with openings.
  • electrical shielding which is required for EMC reasons, for example, is still ensured, but the effective area A ‘of the capacitor is reduced so that the capacitance of the capacitor is also reduced.
  • FIG. 2 shows an embodiment of a flat ribbon cable 1 according to the invention with several electrical conductors 2 arranged parallel to one another in a three-dimensional view.
  • the two measures mentioned namely a perforation of the insulating cover films 3, 4 and the provision of the coupling surface 5 with openings 5 ', are carried out simultaneously.
  • the perforations 4 'in the upper cover sheet 4 are here at the same points as the perforations 5' in the coupling surface 5. This enables a very simple production of the ribbon cable 1 thus created by punching these perforations 4 ', 5' into the already included the coupling surface 5 provided upper cover sheet 4 before it is joined to the electrical conductor 2 and the lower cover sheet 3.
  • a similar effect with regard to the effective area A 'of the capacitor formed between the electrical conductor 2 within the ribbon cable 1 and the coupling surface 5 is achieved in that the coupling surface 5 is not formed by an aluminum foil glued to the PET foil, but rather by coating with a suitably adjusted electrically conductive paste.
  • Such pastes are available, for example, as silver or aluminum conductive pastes. These are polymer pastes that are filled with small particles of the corresponding metal and are applied to the ribbon cables, e.g. by means of a printing process. By reducing the fill factor of these pastes, that is to say the amount of metal particles per volume of the paste, a reduction in the effective area A ‘of the capacitor is achieved, similarly to what was previously described with reference to the openings.
  • Fig. 3 is a coil spring cassette 6 with electrical ribbon cables 1.1
  • the rotor housing part 7 which is on the outside here, can be rotated about its longitudinal axis and thus about the stator housing part 8, which is located on the inside and is arranged coaxially therewith.
  • the outer jacket surface of the stator housing part 8 and the inner jacket surface of the rotor housing part 7 form a winding gap 9 in which the four flexible flat cables are accommodated, one of these flat cables, shown in broken lines in the drawing, being a flat cable 1.1 designed according to the invention.
  • the four flexible flat cables 1.1, 1.2, 1.3 and 1.4 are attached with their respective first ends on the Statorgenosu seteil 8 and with their respective second ends on the rotor housing part 7 and so arranged in the winding gap 9 that they with their adjacent sections of their ends Length on the outer jacket surface of the stator housing part 8 and adjacent to the inner jacket surface of the rotor housing part 7 in opposite directions Direction are wound. Between these two sections of the respective flat cables there are U-shaped turning sections that reverse the winding direction of the same. When the rotor housing part 7 rotates in one direction or the other, these U-shaped turning sections move along the circumference of the winding gap 9, and the ribbon cables are unwound on one side and wound on the other.
  • the other ribbon cables 1.2, 1.3 and 1.4 present in addition to the one ribbon cable 1.1 according to the invention can of course also be other ribbon cables designed according to the invention.
  • conventional ribbon cables can just as well be used here, the mechanical properties of which can be adapted to the requirements of the coil spring cassette 6 without having to take the line impedance into account, or so-called dummy cables that contain no electrical conductor at all, but only made of the insulator material the cover foils exist.

Abstract

According to the invention, a flexible electrical flat ribbon cable comprising at least one electrical conductor which is arranged between two insulating covering films, wherein an electrically conductive layer of flat design is applied as a coupling area to the outer side of at least one of the two covering films, is characterized in that measures for reducing the capacitance per unit length of the capacitor which is formed by the electrical conductor and the coupling area are taken while retaining the geometry of the electrical flat ribbon cable and the material of the insulating covering films.

Description

Flexibles, elektrisches Flachbandkabel und Wickelfederkassette mit einem solchen Flachbandkabel Flexible, electrical ribbon cable and clock spring cassette with such a ribbon cable
Die Erfindung betrifft ein flexibles, elektrisches Flachbandkabel mit zumindest einem elektrischen Leiter, der zwischen zwei isolierenden Deckfolien angeordnet ist, wobei auf der Außenseite zumindest einer der beiden Deckfolien eine flächig ausgebildete, elektrisch leitende Schicht als Kopplungsfläche aufgebracht ist. The invention relates to a flexible, electrical flat ribbon cable with at least one electrical conductor, which is arranged between two insulating cover foils, a flat, electrically conductive layer being applied as a coupling surface on the outside of at least one of the two cover foils.
Weiterhin betrifft die Erfindung eine Wickelfederkassette mit einem solchen Flachbandkabel, wobei die Wickelfederkassette ein feststehendes, zylindrisches Statorgehäuseteil, und ein koaxial zu diesem angeordnetes, um seine Längsachse drehbares zylindrisches Rotorgehäuseteil umfasst, wobei ein durch die äußere Mantelfläche des innen liegenden Gehäuseteils und die innere Mantelfläche des außen liegenden Gehäuseteils begrenzter Wickelspalt gebildet ist, in dem das flexible Flachkabel angeordnet ist. Furthermore, the invention relates to a coil spring cassette with such a ribbon cable, wherein the coil spring cassette comprises a stationary, cylindrical stator housing part, and a cylindrical rotor housing part arranged coaxially to this and rotatable about its longitudinal axis, with a through the outer jacket surface of the inner housing part and the inner jacket surface of the outer housing part limited winding gap is formed in which the flexible flat cable is arranged.
Flexible, elektrische Flachbandkabel der eingangs genannten Art bestehen aus einem oder mehreren im Wesentlichen parallel zueinander angeordneten elektrischen Leiter(n), der/die zwischen zwei isolierenden Deckfolien angeordnet ist/sind. Die Deckfolien sind üblicherweise durch ein Klebemittel miteinander verbunden und schließen somit die elektrischen Leiter zwischen sich ein. Die elektrischen Leiter sind, soweit zumindest zwei davon vorhanden sind, voneinander beabstandet und durch den Kleber und/oder die Deckfolien voneinander isoliert. Die elektrischen Leiter können als im Querschnitt zumeist rechteckige oder quadratische Kupferleiter ausgebildet sein oder im Wege eines Druckvorganges auf eine der beiden Deckfolien aufgetragen worden sein. Eingesetzt werden solche flexiblen, elektrischen Flachbandkabel insbesondere in Anwendungen, in denen nur ein geringer Einbauraum zur Verfügung steht. Flexible, elektrische Flachbandkabel finden z.B. auch Einsatz in solchen Vorrichtungen, in denen zwei gegeneinander bewegliche Elemente in elektrischer Verbindung miteinander stehen, wie dies beispielsweise bei einer Wickelfederkassette eines Kraftfahrzeuges der Fall ist. Eine solche Wickelfederkassette umfasst einen drehfest mit der Lenkspindel verbundenen Rotor und einen mit dem Mantelrohr verbundenen Stator und dient zum Fierstellen einer elektrischen Verbindung zwischen dem statorseitigen Bordnetz und den in einem Lenkrad integrierten elektrischen/elektronischen Komponenten. Innerhalb einer solchen Wickelfederkassette ist das Flachbandkabel entweder in einer Wickelrichtung oder unter Ausbildung einer U-förmigen Umbiegung so aufgewickelt, dass mehrere Lenkradumdrehungen möglich sind. Zu diesem Zweck muss das eingesetzte Flachbandkabel insbesondere bei der zuletzt genannten, auch als U-Turn-Prinzip bezeichneten Ausführung besonders flexibel ausgebildet sein. Flexible, electrical flat ribbon cables of the type mentioned at the beginning consist of one or more electrical conductor (s) arranged essentially parallel to one another, which is / are arranged between two insulating cover foils. The cover films are usually connected to one another by an adhesive and thus enclose the electrical conductors between them. If at least two of them are present, the electrical conductors are spaced from one another and insulated from one another by the adhesive and / or the cover films. The electrical conductors can be designed as mostly rectangular or square copper conductors in cross-section or have been applied to one of the two cover foils by means of a printing process. Such flexible, electrical flat ribbon cables are used in particular in applications in which only a small amount of installation space is available. Flexible, electrical ribbon cables are also used, for example, in devices in which two mutually movable elements are in electrical connection with one another, as is the case, for example, with a coil spring cassette of a motor vehicle. Such a coil spring cassette comprises a rotor connected non-rotatably to the steering spindle and a stator connected to the casing tube and is used to establish an electrical connection between the stator-side electrical system and the electrical / electronic components integrated in a steering wheel. Within such a coil spring cassette, the ribbon cable is wound either in one winding direction or with the formation of a U-shaped bend so that several turns of the steering wheel are possible. For this purpose, the ribbon cable used must be designed to be particularly flexible, particularly in the case of the last-mentioned version, also referred to as the U-turn principle.
Derartige Wickelfederkassetten sind z.B. dafür vorgesehen, um in Kraftfahrzeugen Energie und/oder Daten zwischen drehbeweglich im Lenkrad gehaltenen und ortsfest im Bereich der Lenksäule angeordneten Anschlußstellen sicher übertragen zu können. Über die Anschlußstellen einer solchen Vorrichtung kann z.B. ein Airbagsystem, eine Lenkradheizung, eine Schalteinrichtung usw. mit der bzw. mit den zu seiner Funktion notwendigen Spannung und Signalen versorgt werden. Durch den zunehmenden Umfang elektronischer Funktionen im Lenkrad entsteht der Bedarf einer schnellen und störsicheren Datenübertragung über eine Wickelfederkassette. Dieses ist jedoch aufgrund der Leitungsgeometrien der aktuell verwendeten Flachkabel nur eingeschränkt möglich. Für eine schnelle Datenübertragung ist ein in seiner Impedanz an die Impedanz der verwendeten Zuleitungen angepasstes Leitungssystem notwendig. Insbesondere zur Übertragung schneller Signale, d.h. mit hohen Datenraten von 10 Mbit/sec, 100 MBit/sec oder mehr, z.B. etwa über Flexray, Automotive Ethernet oder LVDS, ist es wünschenswert, die Leitungsimpedanz eines Flachbandkabels in einer Wickelfederkassette der Leitungsimpedanz einer üblicherweise verwendeten verdrillten Leitung anzupassen. Die Impedanz einer solchen Leitung beträgt im Allgemeinen etwa 100 Ohm. Such coil spring cassettes are provided, for example, in order to be able to securely transmit energy and / or data in motor vehicles between connection points that are rotatably held in the steering wheel and that are stationary in the area of the steering column. Via the connection points of such a device, for example, an airbag system, a steering wheel heater, a switching device, etc. can be supplied with the voltage and signals necessary for its function. The increasing scope of electronic functions in the steering wheel creates the need for fast and interference-free data transmission via a coil spring cassette. However, this is only possible to a limited extent due to the geometry of the flat cables currently in use. For fast data transmission, a line system with an impedance that is matched to the impedance of the supply lines used is necessary. In particular for the transmission of fast signals, ie with high data rates of 10 Mbit / sec, 100 Mbit / sec or more, e.g. via Flexray, Automotive Ethernet or LVDS, it is desirable to match the line impedance of a ribbon cable in a coil spring cassette to the line impedance of a commonly used twisted pair Adjust line. The impedance of such a line is generally around 100 ohms.
Zur Datenübertragung werden Flachbandkabel mit zumindest einem elektrischen Leiter und zumindest einer sogenannten Kopplungsfläche eingesetzt. Diese Kopplungsfläche bedeckt eine Außenseite des Flachbandkabels in der Regel vollflächig. Derartige Flachbandkabel mit einer passenden Impedanz von 100 Ohm sind zwar durchaus verfügbar, jedoch sind diese für eine Verwendung in einer Wickelfederkassette nach dem zuvor beschriebenen U-Turn-Prinzip ungeeignet, da sie aufgrund der zur Realisierung der gewünschten Impedanz erforderlichen Dicke der isolierenden Deckfolien zu steif sind. Um eine U-förmige Umbiegung des Flachbandkabels zumindest mit einem so kleinen Radius zu ermöglichen, wie er in einem üblicherweise zur Verfügung stehenden recht knapp bemessenen Wickelspalt erforderlich ist, ist eine höhere Flexibilität des Flachbandkabels vonnöten. Einfach nur die Dicke der isolierenden Deckfolien zu verringern, um die erforderliche Flexibilität zu erreichen, ist jedoch nicht zielführend, da sich dadurch die kapazitive Belag des Flachbandkabels erhöht und damit dessen Impedanz entsprechend verringert. Flat ribbon cables with at least one electrical conductor and at least one so-called coupling surface are used for data transmission. This coupling surface usually covers the entire surface of an outer side of the ribbon cable. Such ribbon cables with a suitable impedance of 100 ohms are certainly available, but they are unsuitable for use in a coil spring cassette according to the U-turn principle described above, since they are too stiff due to the thickness of the insulating cover films required to achieve the desired impedance are. In order to enable the ribbon cable to be bent in a U-shape, at least with a radius that is as small as is required in a winding gap that is usually available, the ribbon cable needs to be more flexible. Simply reducing the thickness of the insulating cover film in order to achieve the required flexibility is not expedient, however, since this increases the capacitive coating of the ribbon cable and thus reduces its impedance accordingly.
Das elektrische Flachbandkabel gemäß der vorliegenden Erfindung hat gegenüber dem Stand der Technik den Vorteil, eine für eine Verwendung in einer Wickelfederkassette nach dem U-Turn-Prinzip erforderliche Flexibilität aufzuweisen und gleichzeitig eine für eine schnelle Datenübertragung geeignete Impedanz bereitzustellen. Im Falle der zuvor genannten Übertragungswege Flexray, Automotive Ethernet oder LVDS beträgt diese „Ziel“ - Impedanz beispielsweise 100 Ohm. The electrical ribbon cable according to the present invention has the advantage over the prior art of having the flexibility required for use in a coil spring cassette according to the U-turn principle and at the same time providing an impedance suitable for fast data transmission. In the case of the aforementioned Transmission paths Flexray, Automotive Ethernet or LVDS, this “target” impedance is 100 Ohm, for example.
Dies gelingt erfindungsgemäß dadurch, dass unter Beibehaltung der Geometrie des elektrischen Flachbandkabels und des Materials der isolierenden Deckfolien Maßnahmen zur Verringerung des Kapazitätsbelages des durch den elektrischen Leiter und die Kopplungsfläche gebildeten Kondensators getroffen sind. According to the invention, this is achieved in that, while maintaining the geometry of the electrical ribbon cable and the material of the insulating cover films, measures are taken to reduce the capacitance per unit length of the capacitor formed by the electrical conductor and the coupling surface.
Die Verringerung des Kapazitätsbelages des durch den elektrischen Leiter und die Kopplungsfläche gebildeten Kondensators erfolgt dabei bevorzugt, indem Maßnahmen zur Verringerung der effektiven relativen Dielektrizitätskonstante und/oder der effektiven Kondensatorfläche getroffen sind. The reduction in the capacitance per unit length of the capacitor formed by the electrical conductor and the coupling surface is preferably carried out by taking measures to reduce the effective relative dielectric constant and / or the effective capacitor surface.
In einer vorteilhaften Ausführungsform ist vorgesehen, dass eine Verringerung der effektiven relativen Dielektrizitätskonstante durch eine Perforation zumindest einer der isolierenden Deckfolien erzielt wird. In an advantageous embodiment it is provided that a reduction in the effective relative dielectric constant is achieved by perforating at least one of the insulating cover foils.
Eine Verringerung der effektiven Kondensatorfläche wird vorteilhaft durch Durchbrechungen in der als Kopplungsfläche wirkenden, elektrisch leitenden Schicht erzielt, oder dadurch, dass diese Kopplungsfläche durch eine elektrisch leitfähige Paste mit einem geringen Füllfaktor an Metall-Partikeln oder durch eine im PVD-Verfahren aufgedampfte Schicht gebildet ist. A reduction in the effective capacitor area is advantageously achieved by perforations in the electrically conductive layer acting as the coupling area, or by the fact that this coupling area is formed by an electrically conductive paste with a low fill factor of metal particles or by a layer vapor-deposited in the PVD process .
Weitere vorteilhafte Ausgestaltungen des erfindungsgemäßen Gegenstandes sind in den Unteransprüchen angegeben und werden anhand eines in den Zeichnungen dargestellten Ausführungsbeispieles näher erläutert. Dabei zeigen Further advantageous configurations of the subject matter according to the invention are specified in the subclaims and are explained in more detail using an exemplary embodiment shown in the drawings. Show it
Fig. 1 einen Querschnitt eines erfindungsgemäßen Flachbandkabels Fig. 2: eine Ausführung eines erfindungsgemäßen Flachbandkabels in einer dreidimensionalen Ansicht 1 shows a cross section of a ribbon cable according to the invention 2: an embodiment of a flat ribbon cable according to the invention in a three-dimensional view
Fig. 3: eine Wickelfederkassette mit einem erfindungsgemäßenFig. 3: a coil spring cassette with an inventive
Flachbandkabel im Querschnitt Ribbon cable in cross section
Wie in Fig. 1 dargestellt, umfasst ein erfindungsgemäßes Flachbandkabel 1 zumindest einen elektrischen Leiter 2. Es sind auch Ausführungen mit mehreren, im Wesentlichen parallel zueinander angeordneten elektrischen Leitern möglich. Da die erfindungswesentlichen Eigenschaften des Flachbandkabels bereits mit nur einem elektrischen Leiter realisierbar sind, wird im Folgenden von dieser einfachsten Ausführung ausgegangen, ohne die Idee darauf zu beschränken. Der elektrische Leiter 2 ist, wie aus der Zeichnung ersichtlich, zwischen zwei isolierenden Deckfolien 3, 4 angeordnet, die miteinander und mit dem elektrischen Leiter 2 durch ein Klebemittel verbunden sind und somit den elektrischen Leiter 2 zwischen sich einschließen. Der elektrische Leiter ist als im Querschnitt zumeist rechteckiger Kupferleiter ausgebildet oder im Wege eines Druckvorganges auf eine der beiden Deckfolien 3, 4 aufgetragen worden. Auf der Außenseite zumindest einer der beiden isolierenden Deckfolien 4 ist eine elektrisch leitende Schicht aufgebracht. Diese elektrisch leitende Schicht erfüllt die Funktion einer sogenannten Kopplungsfläche 5 und bedeckt die Außenseite des Flachbandkabels in der Regel vollflächig. As shown in FIG. 1, a ribbon cable 1 according to the invention comprises at least one electrical conductor 2. Designs with a plurality of electrical conductors arranged essentially parallel to one another are also possible. Since the properties of the ribbon cable that are essential to the invention can already be realized with just one electrical conductor, this simplest embodiment is assumed below without restricting the idea to it. As can be seen from the drawing, the electrical conductor 2 is arranged between two insulating cover films 3, 4 which are connected to one another and to the electrical conductor 2 by an adhesive and thus enclose the electrical conductor 2 between them. The electrical conductor is designed as a copper conductor with a mostly rectangular cross section or has been applied to one of the two cover foils 3, 4 by means of a printing process. An electrically conductive layer is applied to the outside of at least one of the two insulating cover films 4. This electrically conductive layer fulfills the function of a so-called coupling surface 5 and generally covers the outside of the flat ribbon cable over the entire surface.
Die elektrischen Eigenschaften eines solchen Flachbandkabels, insbesondere die hier relevanten Eigenschaften hinsichtlich der Übertragung schneller Signale etwa auf einem Flexray, Automotive Ethernet oder LVDS werden im Wesentlichen durch die Geometrie des Kabels und durch die spezifischen elektrischen Eigenschaften der verwendeten Materialien bestimmt. So ist die hier maßgebliche Leitungsimpedanz des Flachbandkabels umgekehrt proportional zur Wurzel aus dem kapazitiven Belag desselben, welcher wiederum von der Dielektrizitätskonstante des Isolatormaterials, sowie von der Größe und dem Abstand der einander gegenüberliegenden elektrisch leitfähigen Flächen abhängt. Die elektrische Kapazität zweier einander gegenüberliegender elektrisch leitfähiger Platten (Plattenkondensator) ist C = eo * £r * A / d, mit der Fläche A und dem Abstand d der Platten, der relativen Dielektrizitätskonstante sr des zwischen ihnen befindlichen Dielektrikums und der Dielektrizitätskonstante eo des Vakuums. Dieser Zusammenhang beschreibt die Verhältnisse bezüglich des betrachteten Flachbandkabels ausreichend genau, um daraus ableiten zu können, wie dessen entsprechende Parameter hinsichtlich Geometrie und Material beeinflusst werden müssen, um die angestrebte Ziel-Impedanz von 100 Ohm zu erreichen. The electrical properties of such a flat ribbon cable, in particular the properties relevant here with regard to the transmission of fast signals, for example on a Flexray, Automotive Ethernet or LVDS, are essentially determined by the geometry of the cable and the specific electrical properties of the materials used. The line impedance of the ribbon cable, which is decisive here, is inversely proportional to the root of the capacitive coating of the same, which in turn depends on the dielectric constant of the insulating material, as well as on the size and the distance between the opposing electrically conductive surfaces. The electrical capacitance of two opposing electrically conductive plates (plate capacitor) is C = eo * £ r * A / d, with the area A and the distance d between the plates, the relative dielectric constant s r of the dielectric between them and the dielectric constant eo des Vacuum. This relationship describes the relationships with regard to the flat cable under consideration with sufficient accuracy to be able to deduce from it how its corresponding parameters with regard to geometry and material must be influenced in order to achieve the desired target impedance of 100 ohms.
Ausgehend von einem bereits existierenden elektrischen Flachbandkabel 1 mit einer passenden Impedanz von 100 Ohm wird die Dicke der isolierenden Deckfolien 3, 4 desselben so weit verringert, dass seine Flexibilität zur Ermöglichung einer U-förmigen Umbiegung in einem Wickelspalt einer Wickelfederkassette ausreichend ist. Dadurch kann die Impedanz von 100 Ohm bis auf etwa 50 Ohm absinken. Starting from an already existing electrical ribbon cable 1 with a suitable impedance of 100 ohms, the thickness of the insulating cover foils 3, 4 of the same is reduced to such an extent that its flexibility is sufficient to enable a U-shaped bend in a winding gap of a coil spring cassette. This allows the impedance to drop from 100 ohms to around 50 ohms.
Das für die isolierenden Deckfolien 3, 4 verwendete Material, bei dem es sich im vorliegenden Fall um PET handelt, soll aus Gründen der mechanischen Eigenschaften desselben beibehalten werden. Die Breite des elektrischen Leiters 2 innerhalb des Flachbandkabels 1 , und damit die entscheidende Dimension zur Bestimmung der Fläche A der beschriebenen Kapazität, kann ebenfalls aus mechanischen Gründen zumindest zum gegenwärtigen Zeitpunkt nicht unter ein Mindestmaß von in diesem Falle 0,2 mm verringert werden. The material used for the insulating cover films 3, 4, which in the present case is PET, should be retained for reasons of its mechanical properties. The width of the electrical conductor 2 within the ribbon cable 1, and thus the decisive dimension for determining the area A of the capacitance described, cannot be reduced below a minimum of 0.2 mm in this case for mechanical reasons, at least at the present time.
Um dennoch die Impedanz des Flachbandkabels 1 in dem gewünschten Sinne beeinflussen zu können, schlägt die vorliegende Erfindung Maßnahmen vor, um effektive Dielektrizitätskonstanten sr‘ und effektive Flächen A‘ zu „simulieren“, die die angestrebten Wirkungen erzielen. In order to still be able to influence the impedance of the ribbon cable 1 in the desired sense, the present invention proposes measures to "simulate" effective dielectric constants s r 'and effective areas A' that achieve the desired effects.
So ist als eine derartige Maßnahme eine Perforation der isolierenden Deckfolien 3, 4 vorgesehen. Damit ist das Einbringen kleiner Löcher in diese Folien gemeint, durch die, wie sich gezeigt hat, die mechanischen Eigenschaften der Folien nur in geringem Maße verändert werden, die effektive Dielektrizitätskonstante sr‘ sich aber merklich gegenüber der rein materialbedingten relativen Dielektrizitätskonstante sr verringern lässt. A perforation of the insulating cover sheets 3, 4 is provided as such a measure. This means the introduction of small holes in these foils, which, as has been shown, change the mechanical properties of the foils only to a small extent, but the effective dielectric constant s r 'can be reduced noticeably compared to the purely material-related relative dielectric constant s r .
Weitere Maßnahme betreffen die effektive Fläche A‘, des zwischen dem elektrischen Leiter 2 innerhalb des Flachbandkabels 1 und der Kopplungsfläche 5 gebildeten Kondensators. Further measures relate to the effective area A ‘of the capacitor formed between the electrical conductor 2 within the ribbon cable 1 and the coupling surface 5.
So kann etwa die Kopplungsfläche, die z.B. durch eine dünne Aluminium-Folie gebildet wird, mit Durchbrechungen versehen werden. Dadurch ist zwar einerseits eine elektrische Abschirmung, die beispielsweise aus EMV Gründen erforderlich ist, nach wie vor gewährleistet, aber die effektive Fläche A‘ des Kondensators ist verringert, so dass auch die Kapazität des Kondensators verringert ist. For example, the coupling surface, which is formed e.g. by a thin aluminum foil, can be provided with openings. As a result, on the one hand, electrical shielding, which is required for EMC reasons, for example, is still ensured, but the effective area A ‘of the capacitor is reduced so that the capacitance of the capacitor is also reduced.
Fig. 2 zeigt eine Ausführung eines erfindungsgemäßen Flachbandkabels 1 mit mehreren, parallel zueinander angeordneten elektrischen Leitern 2 in einer dreidimensionalen Ansicht. Bei dem hier dargestellten Flachbandkabel 1 sind die beiden genannten Maßnahmen, nämlich eine Perforation der isolierenden Deckfolien 3, 4 und das Versehen der Kopplungsfläche 5 mit Durchbrechungen 5‘ gleichzeitig ausgeführt. Die Durchbrechungen 4‘ in der oberen Deckfolie 4 befinden sich hier an den gleichen Stellen wie die Durchbrechungen 5‘ in der Kopplungsfläche 5. Dies ermöglicht eine sehr einfache Herstellung des so beschaffenen Flachbandkabels 1 durch Stanzen dieser Durchbrechungen 4‘, 5‘ in die bereits mit der Kopplungsfläche 5 versehene obere Deckfolie 4, bevor diese mit dem elektrischen Leiter 2 und der unteren Deckfolie 3 zusammengefügt wird. 2 shows an embodiment of a flat ribbon cable 1 according to the invention with several electrical conductors 2 arranged parallel to one another in a three-dimensional view. In the flat ribbon cable 1 shown here, the two measures mentioned, namely a perforation of the insulating cover films 3, 4 and the provision of the coupling surface 5 with openings 5 ', are carried out simultaneously. The perforations 4 'in the upper cover sheet 4 are here at the same points as the perforations 5' in the coupling surface 5. This enables a very simple production of the ribbon cable 1 thus created by punching these perforations 4 ', 5' into the already included the coupling surface 5 provided upper cover sheet 4 before it is joined to the electrical conductor 2 and the lower cover sheet 3.
Einen ähnlichen Effekt hinsichtlich der effektiven Fläche A‘, des zwischen dem elektrischen Leiter 2 innerhalb des Flachbandkabels 1 und der Kopplungsfläche 5 gebildeten Kondensators erreicht man dadurch, dass die Kopplungsfläche 5 nicht durch eine auf die PET-Folie geklebte Aluminium- Folie gebildet ist, sondern durch eine Beschichtung mit einer geeignet eingestellten elektrisch leitfähigen Paste. Solche Pasten gibt es z.B. als Silber oder Aluminium-Leitpasten. Dies sind Polymer-Pasten, die mit kleinen Partikeln des entsprechenden Metalls gefüllt sind, und z.B. mittels eines Druckprozesses auf die Flachbandkabel aufgebracht werden. Durch eine Verringerung des Füllfaktors dieser Pasten, also der Menge an Metall-Partikeln pro Volumen der Paste, erreicht man, ähnlich wie zuvor anhand der Durchbrechungen beschrieben, eine Verringerung der effektiv wirksamen Fläche A‘ des Kondensators. A similar effect with regard to the effective area A 'of the capacitor formed between the electrical conductor 2 within the ribbon cable 1 and the coupling surface 5 is achieved in that the coupling surface 5 is not formed by an aluminum foil glued to the PET foil, but rather by coating with a suitably adjusted electrically conductive paste. Such pastes are available, for example, as silver or aluminum conductive pastes. These are polymer pastes that are filled with small particles of the corresponding metal and are applied to the ribbon cables, e.g. by means of a printing process. By reducing the fill factor of these pastes, that is to say the amount of metal particles per volume of the paste, a reduction in the effective area A ‘of the capacitor is achieved, similarly to what was previously described with reference to the openings.
In Fig. 3 ist eine Wickelfederkassette 6 mit elektrischen Flachbandkabeln 1.1 ,In Fig. 3 is a coil spring cassette 6 with electrical ribbon cables 1.1,
1.2, 1.3 und 1.4 dargestellt. Das hier außen liegende Rotorgehäuseteil 7 ist um seine Längsachse und somit um das innen liegend, koaxial zu diesem angeordnete Statorgehäuseteil 8 drehbar. Durch die äußere Mantelfläche des Statorgehäuseteils 8 und die innere Mantelfläche des Rotorgehäuseteils 7 wird ein Wickelspalt 9 gebildet, in dem die vier flexiblen Flachkabel aufgenommen sind, wobei eines dieser Flachbandkabel, das in der Zeichnung gestrichelt dargestellt ist, ein erfindungsgemäß ausgeführtes Flachbandkabel 1.1 ist. Die vier flexiblen Flachkabel 1.1 , 1.2, 1.3 und 1.4 sind mit ihren jeweils ersten Enden am Statorgehäu seteil 8 und mit ihren jeweils zweiten Enden am Rotorgehäuseteil 7 befestigt und so in dem Wickelspalt 9 angeordnet, dass sie mit ihren an ihre jeweiligen Enden angrenzenden Abschnitten ihrer Länge an der äußeren Mantelfläche des Statorgehäuseteils 8 und an der inneren Mantelfläche des Rotorgehäuseteils 7 anliegend in entgegen gesetzter Richtung gewickelt sind. Zwischen diesen beiden Abschnitten der jeweiligen Flachkabel befinden sich jeweils die Wickelrichtung derselben umkehrende U- förmige Wendeabschnitte. Bei einer Drehung des Rotorgehäuseteils 7 in der einen oder anderen Richtung bewegen sich diese U-förmigen Wendeabschnitte entlang des Umfangs des Wickelspaltes 9, und die Flachbandkabel werden an ihrer einen Seite ab- und an der anderen aufgewickelt. 1.2, 1.3 and 1.4. The rotor housing part 7, which is on the outside here, can be rotated about its longitudinal axis and thus about the stator housing part 8, which is located on the inside and is arranged coaxially therewith. The outer jacket surface of the stator housing part 8 and the inner jacket surface of the rotor housing part 7 form a winding gap 9 in which the four flexible flat cables are accommodated, one of these flat cables, shown in broken lines in the drawing, being a flat cable 1.1 designed according to the invention. The four flexible flat cables 1.1, 1.2, 1.3 and 1.4 are attached with their respective first ends on the Statorgehäu seteil 8 and with their respective second ends on the rotor housing part 7 and so arranged in the winding gap 9 that they with their adjacent sections of their ends Length on the outer jacket surface of the stator housing part 8 and adjacent to the inner jacket surface of the rotor housing part 7 in opposite directions Direction are wound. Between these two sections of the respective flat cables there are U-shaped turning sections that reverse the winding direction of the same. When the rotor housing part 7 rotates in one direction or the other, these U-shaped turning sections move along the circumference of the winding gap 9, and the ribbon cables are unwound on one side and wound on the other.
Bei den neben dem einen erfindungsgemäßen Flachbandkabel 1.1 vorhandenen weiteren Flachbandkabeln 1.2, 1.3 und 1.4, kann es sich selbstverständlich auch um weitere erfindungsgemäß ausgeführte Flachbandkabel handeln. Es können hier aber ebenso gut konventionelle Flachbandkabel eingesetzt sein, deren mechanische Eigenschaften den Erfordernissen der Wickelfederkassette 6 angepasst werden können, ohne auf die Leitungsimpedanz Rücksicht nehmen zu müssen, oder sogenannte Dummy-Kabel, die überhaupt keinen elektrischen Leiter enthalten, sondern nur aus dem Isolatormaterial der Deckfolien bestehen. The other ribbon cables 1.2, 1.3 and 1.4 present in addition to the one ribbon cable 1.1 according to the invention can of course also be other ribbon cables designed according to the invention. However, conventional ribbon cables can just as well be used here, the mechanical properties of which can be adapted to the requirements of the coil spring cassette 6 without having to take the line impedance into account, or so-called dummy cables that contain no electrical conductor at all, but only made of the insulator material the cover foils exist.
Je nach Zusammensetzung der Wickelfederkassette, sowie insbesondere der Art der weiteren verwendeten Flachbandkabel 1.2, 1.3 und 1.4, kann es erforderlich sein, das erfindungsgemäße Flachbandkabel 1.1 so auszuführen, dass auf den Außenseiten beider Deckfolien 3, 4 Kopplungsflächen 5 aufgebracht sind. Die beschriebenen Maßnahmen zur Verringerung der effektiven relativen Dielektrizitätskonstante sr‘ und/oder der effektiven Kondensatorfläche A‘ können selbstverständlich auch in diesem Falle vorteilhaft verwendet werden. Depending on the composition of the coil spring cassette and in particular the type of other ribbon cables 1.2, 1.3 and 1.4 used, it may be necessary to design the ribbon cable 1.1 according to the invention in such a way that coupling surfaces 5 are applied to the outside of both cover films 3, 4. The measures described for reducing the effective relative dielectric constant s r 'and / or the effective capacitor area A' can of course also be used advantageously in this case.

Claims

Patentansprüche Claims
1. Flexibles elektrisches Flachbandkabel (1 , 1.1) mit zumindest einem elektrischen Leiter (2), der zwischen zwei isolierenden Deckfolien (3, 4) angeordnet ist, wobei auf der Außenseite zumindest einer der beiden Deckfolien (4) eine flächig ausgebildete, elektrisch leitende Schicht als Kopplungsfläche (5) aufgebracht ist, dadurch gekennzeichnet, dass unter Beibehaltung der Geometrie des elektrischen Flachbandkabels (1 , 1.1) und des Materials der isolierenden Deckfolien (3, 4) Maßnahmen zur Verringerung des Kapazitätsbelages des durch den elektrischen Leiter (2) und die Kopplungsfläche (5) gebildeten Kondensators getroffen sind. 1. Flexible electrical ribbon cable (1, 1.1) with at least one electrical conductor (2) which is arranged between two insulating cover films (3, 4), with at least one of the two cover films (4) having a flat, electrically conductive one on the outside Layer is applied as a coupling surface (5), characterized in that while maintaining the geometry of the electrical ribbon cable (1, 1.1) and the material of the insulating cover films (3, 4) measures to reduce the capacitance per unit of the electrical conductor (2) and the coupling surface (5) formed capacitor are met.
2. Flexibles elektrisches Flachbandkabel (1 , 1.1) nach Anspruch 1, dadurch gekennzeichnet, dass zur Verringerung des Kapazitätsbelages des durch den elektrischen Leiter (2) und die Kopplungsfläche (5) gebildeten Kondensators Maßnahmen zur Verringerung der effektiven relativen Dielektrizitätskonstante (sr‘) und/oder der effektiven Kondensatorfläche (A‘) getroffen sind. 2. Flexible electrical ribbon cable (1, 1.1) according to claim 1, characterized in that measures to reduce the effective relative dielectric constant (s r ') are taken to reduce the capacitance per unit length of the capacitor formed by the electrical conductor (2) and the coupling surface (5) and / or the effective capacitor area (A ') are met.
3. Flexibles elektrisches Flachbandkabel nach Anspruch 2, dadurch gekennzeichnet, dass eine Verringerung der effektiven relativen Dielektrizitätskonstante (sr‘) durch eine Perforation zumindest einer der isolierenden Deckfolien (3, 4) erzielt wird. 3. Flexible electrical ribbon cable according to claim 2, characterized in that a reduction in the effective relative dielectric constant (s r ') is achieved by perforating at least one of the insulating cover films (3, 4).
4. Flexibles elektrisches Flachbandkabel nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass eine Verringerung der effektiven Kondensatorfläche (A‘) durch Durchbrechungen (5‘) in der als Kopplungsfläche (5) wirkenden, elektrisch leitenden Schicht erzielt wird. 4. Flexible electrical ribbon cable according to claim 2 or 3, characterized in that a reduction in the effective capacitor area (A ‘) is achieved by perforations (5‘) in the electrically conductive layer acting as the coupling surface (5).
5. Flexibles elektrisches Flachbandkabel nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass eine Verringerung der effektiven Kondensatorfläche (A‘) dadurch erzielt wird, dass die als Kopplungsfläche (5) wirkende, elektrisch leitende Schicht durch eine elektrisch leitfähige Paste mit einem geringen Füllfaktor an Metall- Partikeln gebildet ist. 5. Flexible electrical ribbon cable according to claim 2 or 3, characterized in that a reduction in the effective Capacitor surface (A ') is achieved in that the electrically conductive layer acting as coupling surface (5) is formed by an electrically conductive paste with a low fill factor of metal particles.
6. Flexibles elektrisches Flachbandkabel nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass eine Verringerung der effektiven Kondensatorfläche (A‘) dadurch erzielt wird, dass die als Kopplungsfläche (5) wirkende, elektrisch leitende Schicht durch eine im PVD-Verfahren aufgedampfte Schicht gebildet ist. 6. Flexible electrical ribbon cable according to claim 2 or 3, characterized in that a reduction in the effective capacitor area (A ') is achieved in that the electrically conductive layer acting as the coupling area (5) is formed by a layer vapor-deposited in the PVD process .
7. Wickelfederkassette (6) mit einem feststehenden zylindrischen7. Clock spring cassette (6) with a fixed cylindrical
Statorgehäuseteil (7) und einem koaxial zu diesem angeordneten, um seine Längsachse drehbaren, zylindrischen Rotorgehäuseteil (8), wobei ein durch die äußere Mantelfläche des innen liegenden Gehäuseteils (8) und die innere Mantelfläche des außen liegenden Gehäuseteils (7) begrenzter Wickelspalt (9) gebildet ist, in dem zumindest ein zumindest einen elektrischen Leiter (2) aufweisendes flexibles elektrisches Flachbandkabel (1.1) nach einem der Ansprüche 1 bis 6 angeordnet ist. Stator housing part (7) and a cylindrical rotor housing part (8) arranged coaxially with respect to this and rotatable about its longitudinal axis, with a winding gap (9 ) is formed in which at least one flexible electrical ribbon cable (1.1) having at least one electrical conductor (2) according to one of claims 1 to 6 is arranged.
PCT/EP2020/071967 2019-08-07 2020-08-05 Flexible, electrical flat ribbon cable and coil spring cassette with a flat ribbon cable of this kind WO2021023759A1 (en)

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US5495996A (en) * 1993-06-14 1996-03-05 Sumitomo Electric Industries, Ltd. Cable Reel
US6111203A (en) * 1998-05-29 2000-08-29 Hon Hai Precision Ind. Co., Ltd. Ground plane cable assembly utilizing ribbon cable
EP1758133A1 (en) * 2004-05-24 2007-02-28 Sony Chemicals Corp. Flexible flat cable
US6969807B1 (en) * 2004-07-20 2005-11-29 Advanced Flexible Circuits Co., Ltd. Planar type flexible cable with shielding structure
DE102010046812A1 (en) * 2010-09-28 2012-03-29 Leopold Kostal Gmbh & Co. Kg Coil spring cassette for connection of e.g. airbag system of motor vehicle, has flexible ribbon such as thin steel strip, attached to stator and rotor housing portions

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