EP0616340A1 - Un câble pour équipement électronique - Google Patents

Un câble pour équipement électronique Download PDF

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Publication number
EP0616340A1
EP0616340A1 EP94301869A EP94301869A EP0616340A1 EP 0616340 A1 EP0616340 A1 EP 0616340A1 EP 94301869 A EP94301869 A EP 94301869A EP 94301869 A EP94301869 A EP 94301869A EP 0616340 A1 EP0616340 A1 EP 0616340A1
Authority
EP
European Patent Office
Prior art keywords
cable
electronic equipment
elements
elongate
electrically
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP94301869A
Other languages
German (de)
English (en)
Inventor
Walter Schmid
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0616340A1 publication Critical patent/EP0616340A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones

Definitions

  • THIS invention relates to cables for electronic equipment. Particularly, this invention relates to low impedance cables for electronic equipment, which can supply high currents with low distortion.
  • Electronic equipment such as, loud speakers, need to be supplied with high currents from the amplifier, particularly at low or high frequencies, or both depending upon the loudspeaker. Because of the high current, a certain amount of distortion is created at the final output, as a result of the inductance of the cable and the mechanical vibrations created due to the magnetic field along the length of the cable. The longer the cable, the greater the inductance.
  • the inductance, along with the capacity of the output, such as an electrostatic loud speaker creates a resonant circuit which results in a distortion in the reproduced frequency and in phase response. This distortion depends upon the length of the cable, the ohmic resistance of the cable, and the magnitude of the capacitive load applied.
  • a cable for electronic equipment which includes a first set containing at least one elongate electrically conductive element interspersed with a second set containing at least one electrically conductive element, each member of the first set being electrically connected to every other member of the first set and each member of the first set being electrically insulated from every member of the second set and each member of the second set being electrically connected to every other member of the second set and being electrically insulated from every member of the first set, in such a manner that the current flow in the first set is in one direction, and the current flow in the second set is in the opposite direction, enabling the magnetic field, created by the first set, to cancel the magnetic field created by the second set, thereby at least substantially reducing the inductivity of the cable.
  • each set comprises a plurality of elongate electrically conductive elements, typically, six strands of electrically conductive wire.
  • the strands are of oxygen-free, single-crystal copper, silver or a super conductor material.
  • the elongate elements may be flexible, in the form of strands strings, films, foils, or rigid, in the form of flats, and may be sheathed or housed in insulating material.
  • insulating material is provided between each member of each set of the cable.
  • the insulating material may even be air or vacuum or foam.
  • a cable in accordance with this invention, is indicated generally by the reference numeral 10.
  • the cable 10 in its basic scheme comprises a first set 12 containing at least one elongate electrically conductive element interspersed with a second set 14 containing at least one electrically conductive element, each member of the set 12 (if the set 12 contains more than one elongate electrically conductive element) being electrically connected to every other member of the set in such a manner that the current flow in the set 12 is in one direction indicated by the arrow 16, and the current flow in the set 14 is in the opposite direction indicated by the arrow 18.
  • the creation of opposite magnetic fields when a current flows through the cable 10 enables the magnetic field created by the set 12 to cancel the magnetic field created by the set 14 since the current flow in the two sets are in opposite directions thereby substantially reducing the inductivity of the cable 10.
  • the cable 10 in accordance with the invention, comprises in its basic scheme, as illustrated in Figure 1, one set 12 of strands 20 being flexible elongate elements and another set 14 of strands 22.
  • the strands 20 of the set 12 are all electrically connected to each other.
  • the strands 22 of the set 14 are electrically connected to each other.
  • the strands 20 of set 12 and the strands 22 of set 14 are interspersed in such a manner that a strand 20 of set 12 alternates with a strand 22 of set 14.
  • Such interspersion can be achieved by connecting alternate strands or elements in a conventional cable to form the sets 12 and 14.
  • the current flow in one set 12 is opposite in direction to the current flow in the second set 14. Because the wires are intimately coupled by interspersion, the magnetic field induced by one strand in one set is cancelled by the magnetic field induced by its neighbor. This results in cancelling inductivity throughout the length of the cable. Increasing the number of strands in each set reduces the inductance value.
  • Figure 3 illustrates a rigid cable in which the strands are in the form of rigid flat elements 24 and 26 to form sets 12 and 14 respectively.
  • the elements 24 and 26 are electrically connected and interspersed in the same manner as described in the foregoing description for Figure 2.
  • the elongate elements can be sheathed in an insulating medium to reduce the internal resistance of the cable as well as its inductivity.
  • the resonance effects can be reduced to such an extent that it lies beyond the audible range and therefore, distortion of reproduced sound is attenuated.
  • Figure 4 illustrates a flat flexible resilient cable 10 in which the sets 12 and 14 are made up of insulated foils, sheets or films .
  • the elements of each set are electrically connected by soldering or other means outside the core conductive area designated by the block 30.
  • Figure 5 illustrates a three dimensional array of elements 32 and 34 of the sets.
  • the advantage of a three dimensional array is that each of the elements of each set is coupled more intimately than in a two dimensional configuration because each element is is surrounded on three or even all sides, depending upon the depth of the array.
  • FIG 6 illustrates another alternative configuration of the cable 10 in which the elements comprise tubes or sleeves alternately place annularly around one another.
  • the set of elements 36 are electrically connected and the set of elements 38 are electrically connected in accordance with the teachings of this invention.
  • Figure 7 illustrates the preferred embodiment of the invention in which the elements 40 and 42 are coiled in the form of a continuous spiral, with insulation layers 44 and 46 interspersed between the elements and between the sets respectively.
  • the inductance will be almost completely cancelled because the elements are very intimately coupled.
  • the other advantage of such a configuration is that the mechanical resonance is very low and therefore distortion is attenuated to a great extent.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Communication Cables (AREA)
EP94301869A 1993-03-16 1994-03-16 Un câble pour équipement électronique Withdrawn EP0616340A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA931841 1993-03-16
ZA931841 1993-03-16

Publications (1)

Publication Number Publication Date
EP0616340A1 true EP0616340A1 (fr) 1994-09-21

Family

ID=25582671

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94301869A Withdrawn EP0616340A1 (fr) 1993-03-16 1994-03-16 Un câble pour équipement électronique

Country Status (2)

Country Link
EP (1) EP0616340A1 (fr)
ZA (1) ZA942709B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0867893A2 (fr) * 1997-03-26 1998-09-30 Ascii Laboratories Inc Ligne de raccordement pour appareils-audio

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4808773A (en) * 1987-10-01 1989-02-28 Digital Equipment Corporation Low impedance cable
US5122924A (en) * 1988-12-05 1992-06-16 Murata Manufacturing Co., Ltd. Electronic component having a plurality of current path pairs

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4808773A (en) * 1987-10-01 1989-02-28 Digital Equipment Corporation Low impedance cable
US5122924A (en) * 1988-12-05 1992-06-16 Murata Manufacturing Co., Ltd. Electronic component having a plurality of current path pairs

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0867893A2 (fr) * 1997-03-26 1998-09-30 Ascii Laboratories Inc Ligne de raccordement pour appareils-audio
EP0867893A3 (fr) * 1997-03-26 1999-01-13 Ascii Laboratories Inc Ligne de raccordement pour appareils-audio

Also Published As

Publication number Publication date
ZA942709B (en) 1994-12-12

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