DE102014013555B4 - Cable for signal transmission, method for its manufacture and use of such a cable for the transmission of audio signals - Google Patents

Abstract

Cable (10) for the transmission of electrical signals, comprising an inner conductor (1), an inner conductor (1) surrounding the electrical insulation (2), and with a parallel to the inner conductor (1) extending electrically conductive strip (3), wherein the electrically conductive strip (3) is folded around the electrical insulation (2), and the folding extends around a longitudinal axis of the cable (10), characterized in that the cable (10) has a further inner conductor (1a), a further inner conductor (1a). 1a) surrounding further electrical insulation (2a), and a parallel to the further inner conductor (1a) extending further electrically conductive strip (3a), wherein the further electrically conductive strip (3a) is folded around the further electrical insulation (2a), wherein the fold extends around the longitudinal axis of the cable (10), wherein the inner conductor (1), the electrically conductive band (3), the further inner conductor (1a) and the further electrically conductive band (3a) are parallel next to one another are guided as a double cable, wherein at least one positive electrode (5) to the electrically conductive strip (3) and to the further electrically conductive strip (3a) arranged laterally adjacent and parallel to this, wherein a negative electrode (7) the Inner conductor (1), the electrically conductive band (3), the further inner conductor (1a), the further electrically conductive band (3a) and the at least one positive electrode (5) together surrounds, and wherein a Villardkaskade (9) with the inner conductor (1), the further inner conductor (1a), the negative electrode (7) and the positive electrode (5) is electrically conductively connected.

Description

The invention relates to a cable for transmitting electrical signals, in particular from the field of electroacoustics, and to a method for producing such a cable. At the same time the use of such a cable for the transmission of audio signals is described.

In conventional cables for the transmission of electrical signals, in particular audio cables for the transmission of audio signals, such as interlink cable and speaker cable, at least one electrical conductor is present. Furthermore, a conventional cable has at least one electrically insulating jacket, which bears against the electrical conductor with an inner wall. However, such conventional cables can often not meet the very high requirements for undisturbed signal transmission in the audio sector, inter alia due to a relatively high capacitance and / or inductance per unit length and / or unwanted signal-influencing interactions between individual cable components. Known cables usually do not reach desired values, are often of very complicated construction and / or correspondingly expensive to manufacture.

Especially with audio cables, such as interlink cable and speaker cable, it is desirable that they have as little of their own life as possible. For this purpose, it is desirable to keep interfering electrical and mechanical influences of individual cable components as low as possible. Among other things, it is advantageous to minimize the occurrence of parasitic capacitance between the conductor (s) and / or shielding in order to avoid attenuation in higher frequency ranges and phase shifts. For example, microphone cables have a parasitic capacitance, respond to sound and / or other mechanical vibrations. Furthermore, the lowest possible longitudinal inductance of the conductor (s) of the cable, which likewise has a damping effect on heights and can influence the phase, is desirable.

In particular, inductance and capacitance change the phase between current and voltage depending on frequency, so that the time behavior of many conventional cables is not constant. In addition, unwanted filter circuits and / or resonant circuits may occur. Also known unbalanced cables, such as coaxial cable, with a concentric structure, which have an inner conductor which is surrounded at a constant distance by a hollow cylindrical outer conductor which shields the inner conductor from interference, are often not effective, especially in desirable cables with an outgoing line and a Return, so with a symmetrical structure.

From the DE 11 2006 003 546 T5 is the structure of a coaxial cable known. The coaxial cable comprises an inner conductor and a dielectric surrounding the inner conductor. Around the dielectric around a conductor layer for shielding the inner conductor is arranged. The conductor layer consists of a metal foil, which is designed as a so-called cigarette winding, and an outer conductor layer enclosing the metal foil.

From the DE 699 23 740 T2 a multi-core coaxial cable is known, which comprises per conductor an inner conductor, an insulation and an outer conductor, which run parallel to each other.

From the DE 33 37 433 A1 a speaker cable is known, which has an inner conductor and a dielectric, wherein the dielectric is surrounded by a further annular conductor. This further ring conductor is galvanically connected to the inner conductor at the beginning and at the end of the loudspeaker cable.

From the US Pat. No. 7,126,055 B1 a speaker cable is known which has a conductor which runs parallel to the further line and which is used as a positive electrode. The cable also has an additional conductor surrounding the previous conductors and the positive electrode and used as a negative electrode.

It is an object of the present application to provide a cable for signal transmission, which is characterized in particular by an improved signal transmission, preferably has a reduced longitudinal inductance along the cable, and / or in which a reduced, in particular parasitic, capacitance occurs. It is another object of the present application to provide a simplified and / or improved method for producing such a cable and a use.

These objects are achieved inter alia by a cable having the features of claim 1. Further, these objects are achieved by a manufacturing method of such a cable having the features of claim 8. In claim 9, a use for the cable is specified. Advantageous developments of the cable are the subject of the dependent claims.

According to the invention, a cable for transmitting electrical signals has an inner conductor, an electrical insulation surrounding the inner conductor, and an electrically conductive band running parallel to the inner conductor. The electrically conductive band is folded around the electrical insulation. The fold extends around a longitudinal axis of the cable, ie in the longitudinal direction of the cable. In particular, the fold extends along a long one Edge of the electrically conductive band or parallel to the long edge of the electrically conductive band.

The inner conductor is preferably used to reduce eddy currents. The electrically conductive band fulfills the function of signal transmission. Advantageously, the structure according to the application with the inner conductor and the electrically-conductive band folded around it acts like a Faraday ring, which advantageously reduces or even completely prevents disturbing eddy current losses in the electrically conductive band.

The folding of the electrically conductive band extending in the longitudinal direction of the cable advantageously reduces the longitudinal inductance, which can result in disadvantageous damping in higher frequency ranges and disadvantageous frequency-dependent phase shift between current and voltage. In particular, the fold is formed along the cable length. The folding edge thus extends in the longitudinal direction of the cable.

The electrically conductive band is preferably folded in full cable length. This creates a longitudinal inductance that is similar to a solid single wire. In this case, the folded electrically conductive tape has a much larger surface compared to the single wire. This has a favorable effect on the signal transmission due to the skin effect.

The cable further comprises a further inner conductor, a further electrical insulation surrounding the further inner conductor, and a further electrically conductive band extending parallel to the further inner conductor.

The further electrically conductive band is folded around the further electrical insulation. The fold extends around the longitudinal direction of the cable, ie in the longitudinal direction. The inner conductor, the electrically conductive band, the further inner conductor and the further electrically conductive band are guided parallel to each other as a double cable.

In particular, the double cable has two identically designed individual cables. The individual cables each have the inner conductor with surrounding electrical insulation and the electrically conductive band folded around the inner conductor with surrounding electrical insulation. The double cable has a modular construction with a forward conductor, for example a signal conductor, and a return conductor, for example a neutral conductor. Hinleiter and return conductors are preferably arranged laterally side by side and guided parallel to each other. Preferably, the forward conductor and the return conductor are mechanically fastened to one another, for example by a common external insulation.

Due to the design of the individual cable according to the application, in the case of the adjacent arrangement, the area of the individual cable to the further individual cable is relatively small at a relatively large distance from one another. This makes it possible, advantageously, to achieve a low capacitance and a low inductance, with which disturbing signal-transmitting effects occur only reduced with advantage.

The cable, which is designed as a double cable, also has one positive electrode per individual cable. This can be arranged laterally adjacent or the single cable can be arranged umschlingend. Preferably, parallel to the electrically conductive band and to the further electrically conductive band, a negative electrode is present. The negative electrode coexists the inner conductor, the electrically conductive band, the further inner conductor, the further electrically conductive band and the positive electrode. The cable designed as a double cable therefore has two identically formed individual cables, each having the inner conductor, the electrically conductive band and the positive electrode. These individual components of the single cable are each preferably guided parallel to one another along the longitudinal direction of the cable. In turn, the individual cables are also preferably guided parallel to one another. The negative electrode is designed, for example, as a mesh or as an electrode wound around the two adjacent individual cables.

For example, the positive electrode and / or the negative electrode each have an electrical wire, preferably with a surrounding electrically insulating jacket.

The positive electrode is preferably formed as a single guided electrode, which is guided in two individual cables. Alternatively, two positive electrodes may be used, each positive electrode being associated with a single cable. The embodiments and advantages cited in connection with individually guided positive electrodes are also used in the present application in connection with a jointly executed positive electrode and vice versa.

With the positive electrode and the negative electrode, an electric field can be generated, advantageously avoided by a polarity reversal or polarization in the dielectric formed by the respective electrical insulation, which surrounds the individual cables, and a dielectric relaxation can be reduced. The polarity reversal in the dielectric and the Dielectric relaxation can cause detrimental and disturbing effects in signal transmission, which are reduced or completely avoided by the electric field.

The effect of the polarity reversal in the dielectric as well as the dielectric relaxation are well known to the person skilled in the art at this point and are therefore not explained in any more detail here.

For generating the electric field, in particular for generating required auxiliary voltages (bias), for example, batteries or power supplies can be used.

To generate an electric field which prevents the polarity reversal in the dielectric, a Villard cascade is used. The Villard cascade is designed in such a way that even a low voltage of the signal to be transmitted generates a relatively high voltage and can be used as a bias voltage. A load of the signal to be transmitted is excluded by generating the electric field at the latest after a charging time in the msec range.

In the Villard cascade, a high voltage is achieved by cascading, in particular by multiple series connection of the Greinacher circuit. The Villard cascade, in particular its structure and mode of operation, is known to the person skilled in the art and will therefore not be discussed further here.

According to the invention, the cable has the Villard cascade. The Villard cascade is therefore arranged integrated on the cable and / or attached. The Villard cascade is electrically conductively connected to the inner conductor, the further inner conductor, the negative electrode and the positive electrode. In particular, the individual cables are connected to an input of Villardkaskade. At an exit of the villagascade, the positive electrode and the negative electrode are connected.

The skin effect is well known to the skilled person at this point and will therefore not be explained here.

Overall, advantageously, an improved signal transmission due to the reduced longitudinal inductance can be achieved by the longitudinal folding of the electrically conductive band and due to the favored skin effect.

In the present case, an electrically conductive band is to be understood as meaning preferably a thin body of electrically conductive material, preferably of an integrally formed design, which has a band-shaped and / or strip-shaped geometry. Due to the necessary folding of the electrically conductive band, this preferably has flexible properties. Among other things, the electrically conductive tape can be considered as a continuous, electrically conductive strip. In particular, the electrically conductive band has a limited width and extends in the longitudinal direction. The electrically conductive band is thus preferably designed as a continuous band with the long edge and a limited width.

In the present case, a folding is to be understood in particular as a permanent deformation of the electrically conductive strip. The permanent deformation is produced for example by a forming manufacturing process. In other words, a surface part of the electrically conductive strip is preferably folded over by a bending process in relation to a remaining surface part. In this case, the electrically conductive strip can be folded several times around the inner conductor, in particular bent and / or folded down. For example, the folded electrically conductive tape completely surrounds the inner conductor. The inner conductor is preferably arranged as centrally as possible or almost centrally in the folded electrically conductive band.

In addition to the bending process for folding the electrically conductive strip, the skilled person will of course be aware of other alternative folding possibilities preferably based on stress processes or deformations of the electrically conductive strip under the action of a force such as kinking, crushing or shearing, which may be used in the present case.

In the present case, the longitudinal axis of the cable is to be understood in particular as the longitudinally extending axis of the cable. The longitudinal axis thus extends along the cable.

According to the invention, the inner conductor and the electrically conductive strip run parallel to one another. In particular, the inner conductor is guided in the electrically conductive band or is surrounded, encased and / or encircled by it.

In accordance with at least one embodiment, the inner conductor has at least one electrical wire. For example, the inner conductor is a single wire or a stranded wire. Under a strand is an existing of thin strands and often easy to bend inner conductor to understand. The inner conductor is preferably made of copper, and the inner conductor is particularly preferably made of silver-plated copper. The inner conductor is preferably incorporated in the electrical insulation. The electrical insulation preferably completely surrounds the inner conductor. Especially The electrical insulation has a cylindrical cross-section in which the inner conductor is preferably arranged centrally and / or centrally.

Preferably, the electrical insulation Teflon, ETFE (ethylene-tetrafluoroethylene) and / or crosslinked polyolefins. This advantageously allows a heat-resistant, mechanically strong, smooth and / or slidable inner cable around which the electrically conductive tape is folded. In addition, Teflon, ETFE and crosslinked polyolefins, which can act as a dielectric, have low absorption values of less than 0.1% of electrical energy, with the result that interference effects based on recharge effects, so-called energy storage effects, and dielectric relaxation occur with advantage for signal transmission.

For example, the inner conductor is a so-called AWG 26 wire (AWG: American Wire Gauge) with surrounding electrical insulation. Such inner conductors are known in the art and are therefore not explained in detail here.

The inner cable, so the inner conductor with surrounding electrical insulation, is preferably used in addition to the reduction of eddy current effects, inter alia, as a guide for the folding of the electrically conductive tape.

In accordance with at least one embodiment, the electrically conductive band in the cable cross-section is spiral-shaped. In particular, the electrically conductive band in the cross section of the cable has a spiral-like fold around the inner conductor with surrounding electrical insulation. Of course, it is not absolutely necessary here that the folding of the electrically conductive strip is exactly spiral-shaped, as long as sufficiently good signal transmission is ensured. In particular, a spiral-shaped folding provided with production-related deviations is also expedient. For example, the fold in the cable cross-section is in the form of a planar spiral with rectangular or rectangular-like fold edges. At least partially straight portions of the electrically conductive strip in cross section may occur due to the production, without generating adverse electrical effects.

In accordance with at least one embodiment, the electrically conductive band comprises copper, preferably high-purity copper. Copper has advantageously, inter alia, after a thermal treatment soft and supple properties. This advantageously facilitates further processing steps and processing steps, in particular the folding of the electrically conductive strip. Preferably, the electrically conductive tape is made of high purity, thermally treated copper. Preferably, the electrically conductive tape is a film, particularly preferably a copper foil.

In accordance with at least one embodiment, the inner conductor and the electrically conductive strip are mechanically fastened to one another at each end of the cable and / or connected to one another in an electrically conductive manner. In particular, the attachment is formed only at the ends of the cable. The rest of the cable no further fasteners between the inner conductor and the electrically conductive tape are provided. For example, the inner conductor and the electrically conductive tape are soldered together only at the ends of the cable. The attachment of the inner conductor and the electrically conductive band only at the ends of the cable advantageously allows flexibility of the cable components to each other. This flexibility advantageously allows a simplified laying of the cable, which causes a bending radius change of the cable and a consequent displacement of the inner conductor and the electrically conductive strip to each other.

To generate a sufficiently strong electric field, which prevents the polarity reversal in the dielectric of the electrical insulation, a quadruple to sixfold signal voltage, in particular about a five-fold signal voltage, is required. Through the Villard cascade, this can be generated with advantage. The signal transmission disturbing effects, such as recharging effects in the dielectric of the electrical insulation and the effect of dielectric relaxation, can be advantageously avoided.

In accordance with at least one embodiment, the cable, which is designed as a double cable, further comprises protective resistors that protect connected devices in the event that a diode or a capacitor of the villa cascade has a damage.

In accordance with at least one embodiment, the cable further comprises an outer insulation surrounding the double cable together. The outer insulation preferably has crosslinked polyolefins. Particularly preferably, the crosslinked polyolefins are applied to the double cable at high temperatures, in particular shrunk. Such external insulation is advantageously very stable against mechanical influences, such as crushing, buckling and pulling, and highly damped against mechanical vibrations.

In accordance with at least one embodiment, the cable further comprises a coating disposed over the outer insulation and coextensively surrounding the dual cable. The coating preferably has a fabric tube, which advantageously enables mechanical decoupling.

According to at least one embodiment, all necessary leads and terminations are preferably integrated in the cable.

According to the invention, the cable is used as an audio cable, in particular as a cable for transmitting signals from the field of electroacoustics, for example as an interlink cable, a loudspeaker cable or a digital cable.

The cable is produced in a method according to the invention. This includes several process steps. Thermally treated copper is rolled to a copper tape or copper strip about 70 microns thick to form an electrically conductive ribbon of copper. Then, an inner conductor with jacketed electrical insulation is placed on the electrically conductive tape, wherein the inner conductor is guided on a long edge of the electrically conductive strip, so that the inner conductor and the electrically conductive strip are guided parallel to each other in the longitudinal direction of the cable to be produced, wherein the inner conductor and the electrically conductive band are soldered together only at ends of the cable, so that a mechanical and electrical attachment is formed. Subsequently, the electrically conductive tape is folded or wrapped around the inner conductor with surrounding electrical insulation, wherein the inner conductor is completely surrounded by the electrically conductive tape. Furthermore, the previous process steps are repeated to create a double cable with two cables routed parallel to each other. Following this, one positive electrode is routed in parallel to each cable, in which case a single insulation is shrunk around each cable with the respective positive electrode. Furthermore, a common negative electrode is wound around the two cables with the respective positive electrode and the respective individual insulation. Thereafter, a Villard cascade is connected to the inner conductors, the negative electrode and the positive electrode.

The manufacturing method advantageously allows a simple and fast production of a cable with improved signal transmission, among other things due to a reduced longitudinal inductance.

The embodiments and advantages cited in connection with the cable are also used in connection with the manufacturing process and vice versa.

The electrically conductive tape is preferably formed by smoothing the electrically conductive material. For example, the electrically conductive material is rolled out. Preferably, high-purity copper is rolled out to a copper foil with, for example, a thickness of 70 μm. In comparison with conventional internal conductors, which often consist of drawn copper wires and microantrations and a modified crystalline structure due to their production on their surface, which may result signal-influencing semiconductor effects, these conventional disadvantageous effects do not occur in the rolled-out electrically conductive band.

The inner conductor is applied to the electrically conductive tape, for example by laying. Preferably, the inner conductor is placed along a long edge of the electrically conductive strip. Subsequently, the electrically conductive band is preferably folded several times around the inner conductor in the longitudinal direction of the cable. The folding is preferably carried out by a mechanical method, in particular by mechanical bending. The multiple folding results preferably in a multiple sheathing of the inner conductor with the electrically conductive tape. Between individual turns of the electrically conductive strip, a lubricant, in particular silicone oil, is preferably introduced, with which advantageously the risk of breakage, caused by different lengths in the winding upon bending of the cable, is markedly reduced. Due to folding edges of the electrically conductive strip, the electrically conductive strip per turn can have a rectangular geometry in cross section. Manufacturing-related deviations from this rectangular geometry are of course possible and will be apparent to those skilled in the art.

According to at least one embodiment, the cable has an outer insulation, which is shrunk at temperatures of preferably higher 250 ° C, particularly preferably higher 260 ° C. Preferably, the outer insulation comprises polyolefins preferably having a 3: 1 or greater shrinkage rate. The outer insulation preferably surrounds the remaining components of the cable completely. Such outer insulation is advantageously very stable against mechanical influences and allows a damping against extreme mechanical vibrations.

According to at least one embodiment, the cable has a coating of preferably fabric tube, which is shrunk over the outer insulation. Such a fabric hose advantageously improves the mechanical decoupling of the cable.

Further advantages and advantageous developments of the invention will become apparent from the following in connection with the 1 to 6 described embodiments. Show it:

1 . 5 in each case a schematic longitudinal view of an embodiment of a cable according to the invention,

2 . 3 in each case a schematic cross section of an embodiment of a cable according to the invention,

4 FIG. 2: a schematic view of a Villard cascade used in the cables of the exemplary embodiments of FIGS 3 and 5 Can be used, and

6 : a flow chart of an embodiment of a manufacturing method according to the invention.

In the figures, the same or equivalent components may each be provided with the same reference numerals. The illustrated components and their proportions with each other are not necessarily to be regarded as true to scale.

1 shows an embodiment of a cable 10 in supervision of the cable 10 which is in the manufacturing process. The manufacturing process is in connection with 6 explained in more detail. The cable 10 is an audio cable, such as a speaker cable.

The cable 10 has an inner conductor 1 on top of an electrical insulation 2 completely surrounded or surrounded by this. The inner conductor 1 with surrounding electrical insulation 2 is, for example, a silver-plated copper strand AWG 26 with a teflon insulation. Teflon as a material of electrical insulation makes the cable with heat-resistant, mechanically strong, smooth and slippery with advantage. In addition, Teflon has very favorable absorption values of less than 0.1%, as a result of which disruptive effects such as recharging effects and / or the effect of dielectric relaxation are favorably influenced for signal transmission. As a result, the temporal behavior of the signal to be transmitted also improves with advantage.

The inner conductor 1 and the electrical insulation 2 are on an electrically conductive tape 3 , in particular a copper band, arranged or placed. In particular, the inner conductor 1 with associated electrical insulation 2 on a long edge of the electrically conductive band 3 applied. The inner conductor 1 and the electrically conductive tape 3 run parallel to each other in the longitudinal direction L of the cable 10 , At ends 4a . 4b of the cable 10 is the inner conductor 1 each on the electrically conductive tape 3 mechanically and electrically fixed, in particular soldered to this. Another mechanical and / or electrical attachment between the inner conductor 1 and the electrically conductive tape 3 is not scheduled. As a result, advantageously, when bending and / or laying the finished cable, the displacement of the inner conductor 1 relative to the electrically conductive band 3 require a flexibility of the individual components of the cable 10 be guaranteed to each other.

The electrically conductive band 3 becomes the further process around the inner conductor 1 with surrounding electrical insulation 2 preferably folded several times, in particular wound by folding. The material of the electrically conductive band 3 , in particular high-purity copper is soft and supple by a preceding thermal process, which simplifies the further processing advantage. The inner conductor 1 with surrounding electrical insulation 2 serves as a guide for the folding.

The cable 10 with folded or wound electrically conductive tape 3 is in cross section in the embodiment of 2 shown.

The folding of the electrically conductive band 3 is formed such that the inner conductor 1 with surrounding electrical insulation 2 several times from the electrically conductive tape 3 surrounded or wrapped. Between the individual folds or windings of the electrically conductive band 3 is a lubricant, preferably silicone oil introduced. Overall, results from the multiple folding of the electrically conductive tape 3 in cross-section, in particular a spiral-like shape. The shape of the fold is similar to a rectangular shape with rounded edges.

The electrically conductive band 3 is here folded in full cable length. This creates a reduced longitudinal inductance of the cable during operation 10 which is comparable to a solid single wire. In this case, the electrically conductive tape 3 Compared to a single wire on a much larger surface, which has a favorable effect on the signal transmission due to the skin effect.

For example, the cable points 10 an electrically conductive tape 3 with a width of 36 mm and a thickness of 70 μm. This results in a cross-sectional area of about 2.52 mm ² . Relative to the cable 10 with a cable length of, for example, 100 mm, the surface is about 7200 mm ² . A conventional solid round single wire with a comparable cross-section, ie a radius of 0.9 mm, has only a surface area of about 566 mm ² , ie only 1 / 12.5 of the surface of the electrically conductive strip 3 ,

The cable 10 of the embodiment of 3 is designed as a double cable, the two Single cable 10a . 10b has, which are guided parallel to each other. The single cables 10a . 10b each have the inner conductor 1 . 1a with surrounding electrical insulation 2 . 2a and that around this inner conductor 1 . 1a wound or folded electrically conductive tape 3 . 3a on, as in the previous embodiments of the 1 and 2 are described.

The cable 10 has due to a small area and a large distance of about 1.5 mm, the inner conductor 1 . 1a and the electrically conductive bands 3 . 3a to each other with advantage a capacity of less than 50 pF / m and an inductance of less than 20 μH / m. The signal transmission disturbing effects are minimized with advantage.

Next point the individual cables 10a . 10b one parallel to the inner conductors 1 . 1a guided or around the inner conductor 1 . 1a wound positive electrode 5 on. The positive electrode 5 is for example a Teflon-insulated positive field electrode. In particular, the positive electrode 5 to the respective electrically conductive band in the longitudinal direction of the respective individual cable 10a . 10b be wrapped.

To the positive electrode 5 , the electrically conductive band 3 . 3a and the inner conductor 1 . 1a with surrounding electrical insulation 2 . 2a of each individual cable 10a . 10b is in each case an electrical single insulation 6a . 6b made of polyolefins, each along the single cable 10a . 10b extends and the individual components of each individual cable 10a . 10b completely surrounds.

To the electrical single insulation 6a . 6b is a negative electrode 7 , For example, a negative field electrode of a metal mesh arranged. The negative electrode 7 surrounds the single cables 10a . 10b together. In particular, the negative electrode 7 around the single cables 10a . 10b in the longitudinal direction of the cable 10 be wrapped.

Through the positive electrode 5 and the negative electrode 7 For example, an electric field can be generated which causes a polarity reversal in the respective electrical insulation acting as a dielectric 2 . 2a avoids and reduces the dielectric relaxation. To generate a sufficiently strong electric field, which prevents the polarity reversal in the dielectric, about five times the signal voltage is required. For this a Villard cascade is used, which in connection with 4 is explained in more detail. Since only one electric field is generated, a load on the signal to be transmitted is very low or even impossible.

To the negative electrode 7 is a common external insulation 8th arranged from crosslinked polyolefins. The mechanical structure of cross-linked polyolefins, which are shrunk by high temperatures of over 250 ° C respectively to the respective components with a 3: 1 or larger shrinkage rate, is advantageously very stable and highly damped against mechanical vibrations. On the outer insulation 8th can further shrunk a fabric tube (not shown), which improves the mechanical decoupling advantage.

The embodiment of 4 shows a diagram of a Villard cascade 9 , as used for example in connection with the double cable of the embodiment of 3 Use finds. The Villard cascade 9 is designed so that even a low voltage of the signal to be transmitted, a relatively high voltage can be used. For example, the voltage of the signal in a speaker, which is operated at 400 W (peak) and has 8 ohms impedance, about 79 V. The Villard cascade can be used to generate a very high DC voltage, which limits to 400 V for safety reasons is.

At an entrance E1 of the Villard Cascade 9 is one of the individual cables. In particular, the Villard Cascade 9 electrically connected to this one single cable. At another entrance E2 of the Villard cascade 9 is the other single cable on. They too are electrically connected to each other. The positive electrode is connected to an output X of the Villard cascade 9 electrically connected.

The Villard cascade 9 is mounted on the double cable integrated. Furthermore, all supply lines and terminations are integrated in the cable. A double cable 10 with integrated Villardkaskade example, in the embodiment of 5 shown. The cable 10 has partially on its outer insulation on a housing which is mechanically fixed to the cable, and in which the Villard cascade is arranged.

The generation of a high voltage with the Villard cascade can be used, for example, with audiointerlink cable, loudspeaker cable or digital cable.

In 6 FIG. 10 is a flowchart of a manufacturing process of a cable as in the previous one 3 is executed shown.

In a step S1, a thermally treated copper is rolled to a copper tape or copper strip to about 70 microns thick, so that the electrically conductive tape is formed from copper. Compared to the usually drawn wires, which are mostly used in conventional cables, the rolled-out electrically conductive band of copper has no micro-fractures on its surface and no altered crystalline structure. Such structural changes occurring in conventional wires can give rise to semiconductor effects which have a signal-influencing and signal-disturbing effect. By rolling out the electrically conductive tape these are advantageously avoidable.

In a step S2, the inner conductor is placed on the electrically conductive tape with jacketed electrical insulation. In this case, the inner conductor is guided on a long edge of the electrically conductive strip, so that the inner conductor and the electrically conductive strip are guided parallel to one another in the longitudinal direction of the cable to be produced. In this case, the inner conductor is soldered only at the ends of the cable to the electrically conductive band or vice versa, so that a mechanical and electrical fastening is formed.

In a step S3, the electrically conductive band is folded around the inner conductor with surrounding electrical insulation. Among other things, the inner conductor serves as a guide for the folding. The fold, ie in particular the folded edge, extends in the longitudinal direction of the cable to be produced. The electrically conductive band is folded or wound around the inner conductor several times, so that the inner conductor is completely surrounded by the electrically conductive band.

The steps S1 to S3 are performed twice to make a double cable having two cables routed in parallel with each other, an angled cable and a return cable.

In a step S4, the positive electrode is guided parallel to the inner conductor of the Hinkabels and parallel to the inner conductor of the return cable. In particular, the positive electrode is wound around the respective electrically conductive band in the longitudinal direction of the respective cable. Cross-linked polyolefins are then shrunk around these components of each cable at a 3: 1 or greater shrink rate at a high temperature of about 250 ° C or higher as a single insulation.

In a step S5, the negative electrode is wound around the forward and the return cable together, so that the negative electrode is also guided in the longitudinal direction of the double cable and allows a first mechanical attachment of the Hinkabels to the return cable and vice versa. In particular, the negative electrode can be designed as a tube made of tinned copper fabric. Around the negative electrode the outer insulation and / or the coating of fabric tube are shrunk, which terminate the return cable to the outside.

In a final step S6, the Villard cascade is electrically connected to individual electrical wires of the double cable and mechanically fastened by means of a housing directly to the double cable. In addition, all supply lines and terminations are integrated in the double cable.

LIST OF REFERENCE NUMBERS

1

inner conductor

1a

another inner conductor

2

electrical insulation

2a

further electrical insulation

3, 3a

electrically conductive tape

4a, 4b

Ends of the cable

5

positive electrode

6a, 6b

Single insulation

7

negative electrode

8th

external insulation

9

Villardkaskade

10a, 10b

Single cable

10

electric wire

L

longitudinal direction

E1

entrance

E2

another entrance

A

output

X

output

S1 to S6

steps

Claims (9)

Electric wire ( 10 ) for transmission of electrical signals, with an inner conductor ( 1 ), one of the inner conductor ( 1 ) surrounding electrical insulation ( 2 ), and with a parallel to the inner conductor ( 1 ) extending electrically conductive band ( 3 ), wherein the electrically conductive band ( 3 ) around the electrical insulation ( 2 ), and folding around a longitudinal axis of the cable ( 10 ), characterized in that the cable ( 10 ) a further inner conductor ( 1a ), a further inner conductor ( 1a ) surrounding further electrical insulation ( 2a ), and a parallel to the further inner conductor ( 1a ) extending further electrically conductive tape ( 3a ), wherein the further electrically conductive band ( 3a ) about the further electrical insulation ( 2a ), wherein the fold around the longitudinal axis of the cable ( 10 ), wherein the inner conductor ( 1 ), the electrically conductive band ( 3 ), the further inner conductor ( 1a ) and the further electrically conductive band ( 3a ) are guided parallel to each other as a double cable, wherein at least one positive electrode ( 5 ) to the electrically conductive tape ( 3 ) and to the further electrically conductive band ( 3a ) is laterally adjacent and guided parallel to this, wherein a negative electrode ( 7 ) the inner conductor ( 1 ), the electrically conductive band ( 3 ), the further inner conductor ( 1a ), the other electrically conductive band ( 3a ) and the at least one positive electrode ( 5 ) and where a Villard cascade ( 9 ) with the inner conductor ( 1 ), the further inner conductor ( 1a ), the negative electrode ( 7 ) and the positive electrode ( 5 ) is electrically conductively connected. Electric wire ( 10 ) according to claim 1, wherein the electrically conductive tape ( 3 ) is spiral in the cable cross-section. Electric wire ( 10 ) according to any one of the preceding claims, wherein the electrically conductive tape ( 3 ) Copper has. Electric wire ( 10 ) according to one of the preceding claims, wherein the inner conductor ( 1 ) is a single wire or a stranded wire. Electric wire ( 10 ) according to one of the preceding claims, wherein the inner conductor ( 1 ) and the electrically conductive band ( 3 ) at each end ( 4a . 4b ) of the cable ( 10 ) are mechanically attached to each other and electrically connected to each other. Electric wire ( 10 ) according to one of the preceding claims, wherein between the individual folds of the electrically conductive strip ( 3 ) or between individual turns of the electrical tape ( 3 ) a lubricant is introduced. Electric wire ( 10 ) according to one of the preceding claims, further comprising an outer insulation ( 8th ), which surrounds the double cable together. Method for producing a cable ( 10 ) comprising the following steps: - rolling out (S1) thermally treated copper into a copper tape or copper strip with a thickness of about 70 μm, so that an electrically conductive strip ( 3 ) arises from copper; - placing (S2) an inner conductor ( 1 ) with jacketed electrical insulation ( 2 ) on the electrically conductive tape ( 3 ), wherein the inner conductor ( 1 ) on a long edge of the electrically conductive strip ( 3 ), so that the inner conductor ( 1 ) and the electrically conductive band ( 3 ) parallel to each other in the longitudinal direction of the cable to be produced ( 10 ) are guided, wherein the inner conductor ( 1 ) and the electrically conductive band ( 3 ) only at the ends of the cable ( 10 ) are soldered together, so that a mechanical and electrical attachment is created; - Folding or winding (S3) of the electrically conductive strip ( 3 ) around the inner conductor ( 1 ) with surrounding electrical insulation ( 2 ), wherein the inner conductor ( 1 ) completely from the electrically conductive tape ( 3 ) is surrounded; Repeating the method steps rolling (S1), laying (S2) and folding or winding (S3) around a double cable with two parallel cables ( 10a . 10b ) to accomplish; - guiding (S4) one positive electrode each ( 5 ) parallel to each cable ( 10a . 10b ), after which each cable ( 10a . 10b ) with the respective positive electrode ( 5 ) each a single insulation ( 6a . 6b ) is shrunk; Winding (S5) a common negative electrode ( 7 ) around the two cables ( 10a . 10b ) with the respective positive electrode ( 5 ) and the individual insulation ( 6a . 6b ); - connecting (S6) a Villard cascade ( 9 ) to the inner conductors ( 1 . 1a ), the negative electrode ( 7 ) and the positive electrode ( 5 ). Use of a cable according to one of claims 1 to 7 for the transmission of audio signals.

Images