JP4569300B2 - Cable harness - Google Patents

Description

The present invention, bending of the electronic equipment, relating to case Bull harness suitable for use in accompanied wiring portions twisting.

  In recent years, with the spread of notebook computers, mobile phones, small video cameras, etc., in addition to the reduction in size and weight of these information communication devices, high-speed data transmission and higher density are required. In these communication devices, the liquid crystal display unit is usually configured to be foldable. Therefore, the electrical connection between the device main unit and the display unit is a wiring structure involving bending, twisting, etc. It is said that. In general, it is necessary to suppress the occurrence of electromagnetic interference (EMI) between circuits due to electromagnetic waves radiated from signal lines.

  In order to cope with this, a flexible substrate (FPC) that can be bent for circuit mounting and wiring in an apparatus is used. However, in addition to the conventional folding type, recently, an opening / closing / twisting type device has appeared, and generally the wiring length of the FPC becomes long, and it is difficult to minimize the ground potential. For circuit wiring using FPC, a solid ground structure having a ground conductor layer as a ground conductor layer is known as a ground conductor layer for securing a low resistance ground conductor and EMI countermeasures. The bendability is poor at the bent part, and cracks may occur and break.

  For this reason, it is known that slits are made in the ground conductor portion of the rotating bending portion, and signal conductors and ground conductors are alternately arranged in a staggered manner to reduce ground conductor performance and ensure flexibility. (For example, refer to Patent Document 1). However, if the number of solid ground conductors is reduced in order to improve flexibility, the resistance value of the ground conductor increases and the ground potential rises, and there is a problem that the impedance mismatch of signals and EMI characteristics deteriorate. The wiring method using the FPC has not provided a satisfactory effective solution.

It is also known to use a bend-resistant shielded cable at a portion where the bending of a robot or the like is repeatedly applied to the wiring of the rotational bending portion using the FPC (for example, see Patent Document 2). In the bending-resistant shielded cable disclosed in Patent Document 2, a plurality of electric wires having a shield layer are twisted to form a cable core, the outer periphery thereof is pressed and wound, a shield layer is provided on the outer side, and the outermost layer is externally wound. Covered with a cover. And it is supposed that both the shield layer of an electric wire and the shield layer of a cable core can be formed by horizontal winding or a braided structure using a copper foil thread.
Japanese Patent Laid-Open No. 2004-88020 Japanese Utility Model Publication No. 5-38712

  Whereas FPC is used for the electrical wiring of the rotating and bending part, recently, wiring using a cable harness in which a plurality of ultra-fine coaxial wires are bundled in a part that involves opening / closing and twisting of a folding device such as a mobile phone. The method has been adopted. In the wiring system using this cable harness, the bending / twisting performance can be ensured for the time being, and there is no problem with respect to impedance matching and EMI due to the use of a coaxial line. However, since the coaxial wire used is usually a very thin wire having an outer diameter of 1 mm or less, the resistance value of the outer conductor is relatively large, and there is a problem that a potential difference occurs in the ground portion when the wiring length becomes long.

  Therefore, in order to reduce the resistance of the outer conductor of the coaxial line, if the outer conductor size of the coaxial line is increased or a double structure is used, the bending / twisting performance deteriorates. Therefore, a plurality of conductor wires (copper wires) are covered with horizontal windings or braided copper wires along the outer circumference of the bundled coaxial wires and run parallel to the outer conductor of the coaxial wires. Tried to establish. However, although the ground potential can be improved, there is a problem that the copper wires forming the braided conductor track rub against each other due to bending and twisting, resulting in breakage, and still satisfying the mechanical characteristics. It is not done.

In addition to this, a tape-shaped conductor (for example, used for a grounding wire) in which a plurality of conductor wires are twilled to give flexibility, and a braided copper foil yarn as shown in Patent Document 2 are used together. for even shielding layer in the case of shielding, every overlapping bend, similar problems are envisaged for twisting.
The present invention has been made in view of the above, bends, it is an object to provide a to case Bull harness improved mechanical properties which can reduce the breakage occurs without reducing the twisting performance.

Cable harness according to the invention, the wire group obtained by bundling a plurality of wires, covered by a lateral winding of a plain weave was tape-like conductor fiber yarn by arranging a plurality of Dohakuito in parallel to the warp plastics as weft It is characterized by that. For the electric wires of the electric wire group, an insulating wire or a coaxial wire composed of an inner conductor, an insulator, and an outer conductor is used. When a coaxial line is used, the outer conductor of the coaxial line is electrically connected to the tape-shaped conductor at one or more locations.

  According to the present invention, the presence of a slight gap between the plurality of conductor wires constituting the tape-like conductor reduces the friction between the conductor wires due to bending and twisting, resulting in a disconnection accident. It is possible to reduce the occurrence of the above and to provide a durable shield conductor. Moreover, the ground potential difference of a coaxial line can be reduced by electrically connecting the wound tape-shaped conductor and the bundled outer conductor of the coaxial line at a desired portion.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram for explaining the outline of a tape-shaped conductor according to the present invention. In the figure, 1 is a tape-shaped conductor, 2 is a conductor wire, 2 'is a copper foil yarn, 3 is a fiber yarn, 3a is a tangling yarn, 4 is a copper foil tape, and 5 is a high tensile strength fiber yarn.

As shown in FIG. 1 (A), the tape-shaped conductor 1 according to the present invention has a plurality of conductor strands 2 arranged in parallel and used as warp yarns, plastic fiber yarns 3 as weft yarns, and warp and weft yarns. It is a plain weave structure that crosses one by one, and is knitted into a tape shape .

As fiber yarn 3 of transverse yarns, to plain weaving at a pitch 1.5mm~2.5mm 50 denier polyester yarn. In addition, the fiber yarn 3 is entangled and fixed using the entanglement yarn 3a at one end of the conductor strands 2 arranged in parallel, and the fiber yarn 3 is not unwound or loosened even if the fiber yarn 3 is cut halfway. I am doing so.

The conductor wire 2, can be used Dohakuito 2 '. The Dohakuito 2 ', as shown in FIG. 1 (B), generally a high tensile strength fiber yarn 5 of polyester yarn, etc.-out lap winding the rectangular wire like copper foil tape 4 which is manufactured by rolling a round wire Tin alloy copper or ordinary copper is used as the copper foil material. This copper foil thread 2 ′ is generally used for an earphone, a headphone, a curl cord of a telephone, and the like, and is known as a conductor wire excellent in bending strength and flexibility. In the present invention, for example, 90 copper foil yarns 2 'having an outer diameter of about 0.11 mm are juxtaposed in parallel at a pitch of 0.13 mm to give warp yarns, and 50 denier polyester yarns as weft yarns and a pitch of 1.5 mm to 2.5 mm. Plain weave.

Tape-like conductor 1 as described above, the shield conductor wound on the outer periphery of the wire group obtained by bundling a pole plurality of electric wires of the fine, bending, can be used for duty post involving any twisting. In this case, the presence of a slight gap between the plurality of conductor wires constituting the flexible conductor reduces the friction between the conductor wires due to bending and twisting, and reduces the occurrence of disconnection accidents. can do. Incidentally, at least one of the plurality of copper foil yarn 2 'made of a warp, may be replaced by tensile strength fiber yarn such as aramid fibers. In this case, the conductive resistance is somewhat high, but a high tension tape-shaped conductor can be obtained.

  FIG. 2 is a diagram showing an outline of a cable harness in which a shield conductor is formed using a tape-like conductor as described in FIG. In the figure, 1 is a tape-shaped conductor, 6a is an insulated wire, 6b is a coaxial wire, 7 is an electric wire group, 7a is an intermediate portion, 7b is an end, 8 is a presser tape, 9 is a protective tape, 10a and 10b are electric Connector, 11 is a shield conductor, 11a is a shield terminal, 12 is an internal conductor, 13 is an insulator, 14 is an external conductor, and 15 is a jacket.

  As shown in FIG. 2 (A), the cable harness according to the present invention has a plurality of insulated wires 6a or coaxial wires 6b, or both ends of a wire group 7 formed by bundling the insulated wires 6a and the coaxial wires 6b in a composite state. The electrical connectors 10a and 10b are connected to the part 7b, and the intermediate part 7a is configured to be bundled in a round shape with the pressing tape 8. Both ends 7b of the electric wire group 7 are aligned so that the insulated wires 6a or the coaxial wires 6b are arranged in a parallel row, and are connected to the terminals of the electrical connectors 10a and 10b. In addition, the presser tape 8 for bundling the intermediate part 7a of the electric wire group 7 only needs to be able to bind the insulating wire 6a or the coaxial wire 6b.

The tape-shaped conductor 1 described with reference to FIG. 1 is wound around the outer periphery of the presser tape 8 in which the electric wire group 7 is bundled to form a shield conductor 11. In this case, at least one of the plurality of conductor strands 2 serving as warp yarns may be replaced with a tensile fiber yarn such as an aramid fiber. A protective tape 9 is wound around the outside to prevent the shield conductor 11 from being damaged by an external force and to protect the shield conductor 11 so that it can be easily handled during device assembly. As the conductor wire 2 of the tape-like conductor 1 of case, it is possible to use copper foil yarn 2 'as described with reference to FIG. The shield terminal 11a of the shield conductor 11 is twisted together and connected to the ground potential portion of the electrical connectors 10a and 10b, or a separately prepared ground terminal (not shown) is connected to the inside of the device. Connect to the provided ground terminal.

  FIG. 2B shows an example of the insulated wire 6 a constituting the electric wire group 7, and has a shape in which the outer side of the internal conductor 12 is covered with the insulator 13. The inner conductor 12 is formed of a single wire made of a copper alloy wire having an outer diameter of about 0.05 to 0.1 mm, or a stranded wire obtained by twisting seven copper alloy wires having an outer diameter of about 0.025 mm as shown in the figure. . The insulator 13 is formed by, for example, extrusion-coating a fluororesin-based PFA (tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer) to a thickness of about 0.02 mm to 0.06 mm, or winding the tape. The As shown in FIG. 2 (A), a plurality of insulated wires 6a or a plurality of wire pairs are bundled, and electrical connectors 10a and 10b are connected to both ends, as shown in FIG. A shield conductor 11 is wound by horizontal winding at about 15 mm to form a cable harness.

  FIG. 2 (C) shows an example of the coaxial line 6b constituting the electric wire group 7. The outer side of the inner conductor 12 is covered with an insulator 13, and the outer conductor 14 is coaxially arranged on the outer side of the outer conductor 15. It is the shape covered with. The inner conductor 12 and the insulator 13 are formed, for example, in the same manner as the insulated wire 6a in FIG. 2B, and a copper alloy wire having an outer diameter of about 0.03 mm is braided or laterally wound outside the insulator 13. And the outer conductor 14 is formed by winding two layers of polyester tape having a thickness of about 0.004 mm. As shown in FIG. 2 (A), a plurality of the coaxial wires 6b are bundled, electrical connectors 10a and 10b are connected to both ends, and the tape-like conductor 1 is wound in a lateral winding at a pitch of about 5 mm to 15 mm to shield the conductor. 11 and a cable harness.

  FIG. 3 is a view showing another embodiment of a cable harness in which the coaxial wires 6b of FIG. 2C are bundled as the electric wire group 7, and FIG. 3A is a state in which an electrical connector is connected to both ends of the electric wire group. FIG. 3B is a diagram showing a state in which a tape-like conductor is wound around the middle part of the electric wire group and protected by a protective tape. In the figure, reference numeral 16 denotes an exposed portion of the outer conductor of the coaxial line, and description of other reference numerals is omitted by using the same reference numerals as those described in FIGS.

  In this embodiment, the outer conductor of the coaxial line 6b and the shield conductor 11 are electrically connected at an arbitrary or desired portion of the intermediate portion 7a of the electric wire group 7, thereby minimizing (reducing the ground potential difference of the outer conductor of the coaxial line. And low resistance grounding. In addition, the end portion 7b of the electric wire group 7 is not bent into an L shape as shown in FIG. 2, but the end portion 7b of the electric wire group is narrowed in a fan shape while keeping the original electrical connector attached. It is shown in an example of binding. In addition, when the harness length is short with this shape, it is necessary to consider that the length of the coaxial line 6b is different between the central portion and the end side. However, when the harness length is long, it is absorbed by the fan-shaped displacement portion at the end portion. Can be adjusted.

  In this embodiment, as shown in FIG. 3A, the outer conductor 14 is exposed by cutting open the outer cover of the coaxial line 6b at a desired portion (one or more) in the longitudinal direction at the intermediate portion 7a of the wire group 7. Let me. The external conductor exposed portion 16 can be subjected to a treatment (for example, application of a conductive paint, binding with a flexible conductor, etc.) such that when the electric wire group 7 is bundled, they are electrically connected and integrated with each other. . The electrical connectors 10a and 10b (or the printed circuit board) may be connected either before or after the outer conductor exposed portion 16 is formed.

  Subsequently, as shown in FIG. 3B, the tape-like conductor 1 described in FIG. 1 is wound around the intermediate portion 7 a of the bundled electric wire group 7 in a horizontal winding to form a shield conductor 11. The end portion of the tape-like conductor 1 is collectively formed into a twisted wire shape as a shield terminal 11a and connected to the ground potential portion of the electrical connectors 10a and 10b, or a separately prepared ground terminal (not shown) is connected. Connect to the ground terminal provided in the device.

  In this case, the electric wire group 7 is bundled by winding the tape-shaped conductor 1 directly on the electric wire group 7 without being bundled with a pressing tape. The shield conductor 11 thus formed is electrically connected to the exposed outer conductor 14 of the coaxial line 6b at the exposed outer conductor portion 16 formed at a predetermined portion. In addition, in order to ensure electrical connection, means such as conductive paint, solder, and a conductive band may be used supplementarily. Thereafter, similarly to the case of FIG. 2A, the protective tape 9 is wound around the outer surface of the shield conductor 11 to protect the shield conductor 11 from damage.

  By connecting the shield terminal 11a of the shield conductor 11 to the ground, the shield conductor 11 becomes a ground conductor connected in parallel to the outer conductor of the coaxial line 6b. Even if each of the outer conductors of the coaxial line 6b is grounded by the electrical connectors 10a and 10b at both ends to be ground potential, if the harness length between the electrical connectors 10a and 10b is long, the intermediate portion and the electrical connector 10a , 10b may cause a difference in ground potential. However, as described above, the outer conductor of the coaxial line 6b is collectively connected to the shield conductor 11 at a desired portion to be set to the ground potential, so that the ground potential difference as described above can be reduced.

  When manufacturing a cable harness as shown in FIG. 2 or FIG. 3, conventionally, several shield conductor wires are used to collectively form a shield conductor around a group of wires. Braided in units or wound sideways. For this reason, in terms of manufacturing, it is necessary to feed out the number of conductor wires corresponding to the number of conductor wires, which requires time for manufacturing and high-precision winding. Further, when used in a portion that is bent or twisted, adjacent conductor wires rub against each other, easily breaking, and having a short service life.

  However, the cable harness according to the present invention simply forms the shield conductor 11 simply by winding a tape-shaped conductor in which a plurality of conductor strands are arranged in parallel in a tape shape around the wire group at a predetermined pitch. can do. As shown in FIG. 1, this tape-shaped conductor can be formed relatively easily by plain weaving using a plurality of conductor wires as warp yarns and plastic yarns such as polyester yarns as weft yarns. Since each conductor wire is separated from each other by a weft plastic yarn, even if it is used in a portion that is bent or twisted, the conductor wires adjacent to each other do not rub against each other, and disconnection occurs. Significantly reduced, it has become possible to extend the service life.

  A cable harness in which 40 coaxial wires are bundled with a foamed tetrafluoroethylene resin tape and a tape-like conductor according to the present invention in which copper foil yarn is used as a conductor wire around the outer periphery of the cable harness is 100 mm long. Between them and twisted ± 180 ° (1 time per reciprocation) 150,000 times, but some swelling occurred when the shield wire was wound, but the copper foil thread was not broken It was. Moreover, even when an annealed copper wire was used as the conductor element wire, the winding state of the shield conductor was disturbed but did not break. On the other hand, when the shield conductor is formed of a braid of annealed copper wire, similarly gripped between 100 mm in length and twisted ± 180 ° 10,000 times, the braided annealed copper wire is separated. As a result, disconnection also occurred and a predetermined twisting characteristic could not be obtained.

It is a figure explaining the outline of the tape-shaped conductor by this invention. It is a figure explaining embodiment of the cable harness by this invention. It is a figure explaining other embodiment of the cable harness by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Tape-like conductor, 2 ... Conductor strand, 2 '... Copper foil yarn, 3 ... Fiber yarn, 3a ... Tangle yarn, 4 ... Copper foil tape, 5 ... High tensile fiber yarn, 6a ... Insulated wire, 6b DESCRIPTION OF SYMBOLS ... Coaxial wire, 7 ... Electric wire group, 7a ... Intermediate | middle part, 7b ... End part, 8 ... Pressing tape, 9 ... Protective tape, 10a, 10b ... Electrical connector, 11 ... Shield conductor, 11a ... Shield terminal, 12 ... Internal conductor , 13 ... insulator, 14 ... outer conductor, 15 ... jacket, 16 ... exposed portion of outer conductor of coaxial line.

Claims (5)

Wire group obtained by bundling a plurality of wires, and features that you have cracks covered by SPIRAL plain weave the tape-like conductor fiber yarn by arranging a plurality of Dohakuito in parallel to the warp plastics as weft Cable harness. Wherein among the plurality of conductors wires, cable harness according to claim 1, characterized in that at least one and tensile strength fiber yarn. The cable harness according to claim 1 or 2 , wherein the electric wires of the electric wire group are insulated wires. The cable harness according to claim 1 or 2 , wherein the electric wires of the electric wire group are coaxial wires including an inner conductor, an insulator, and an outer conductor. 5. The cable harness according to claim 4 , wherein a plurality of outer conductors of the coaxial line are electrically connected to the tape-shaped conductor at one or more locations.

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