WO2022130801A1 - Multicore parallel cable and method for manufacturing same - Google Patents

Multicore parallel cable and method for manufacturing same Download PDF

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Publication number
WO2022130801A1
WO2022130801A1 PCT/JP2021/039938 JP2021039938W WO2022130801A1 WO 2022130801 A1 WO2022130801 A1 WO 2022130801A1 JP 2021039938 W JP2021039938 W JP 2021039938W WO 2022130801 A1 WO2022130801 A1 WO 2022130801A1
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WIPO (PCT)
Prior art keywords
conductor
parallel cable
film
recess
coaxial
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PCT/JP2021/039938
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French (fr)
Japanese (ja)
Inventor
毅安 中山
博人 今村
哲 山崎
Original Assignee
東京特殊電線株式会社
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Application filed by 東京特殊電線株式会社 filed Critical 東京特殊電線株式会社
Priority to DE112021006442.8T priority Critical patent/DE112021006442T5/en
Priority to JP2022569755A priority patent/JPWO2022130801A1/ja
Publication of WO2022130801A1 publication Critical patent/WO2022130801A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00—Communication cables or conductors
    • H01B11/18—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
    • H01B11/1808—Construction of the conductors
    • H01B11/1826—Co-axial cables with at least one longitudinal lapped tape-conductor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00—Communication cables or conductors
    • H01B11/18—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
    • H01B11/20—Cables having a multiplicity of coaxial lines
    • H01B11/203—Cables having a multiplicity of coaxial lines forming a flat arrangement
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/016—Apparatus or processes specially adapted for manufacturing conductors or cables for manufacturing co-axial cables

Definitions

  • the present invention relates to a multi-core parallel cable having a small transmission loss and a method for manufacturing the same.
  • a coaxial cable having an external conductor As a coaxial cable with excellent shield characteristics, a coaxial cable having an external conductor is known. As shown in FIG. 7, excellent shielding characteristics are similarly required for a two-core parallel cable in which two coaxial wires 3 in which the outer periphery of the central conductor 1 is covered with an insulator 2 are arranged in parallel. For example, Patent Document 1 , 2 is proposed.
  • the 2-core parallel cable 10 shown in FIG. 7 of the present application exemplifies a hollow structure as the insulator 2.
  • Patent Document 1 two cores in which the outer periphery of the inner conductor is covered with an insulator are arranged in parallel, and a metal vapor deposition layer is formed on one or both sides of a plastic tape on the outer periphery of these two cores.
  • the composite tape of No. 1 is vertically attached so that the metal vapor deposition layer is on the outside, a horizontal winding shield is applied to the outer periphery of the first composite tape, and metal vapor deposition is performed on one or both sides of the plastic tape on the outer periphery of the horizontal winding shield.
  • a two-core parallel cable is proposed in which a second composite tape on which a layer is formed is wound so that the metal vapor deposition layer is on the inside, and the outer circumference of the second composite tape is covered with a jacket.
  • an insulating coating layer having a gap portion (fan surface shape) continuous in the longitudinal direction is provided on the outer periphery of the central conductor to form a signal line, which is arranged in parallel with two cores, and further, a central valley of both signal lines.
  • a high-speed differential transmission cable has been proposed in which a drain wire is arranged in a portion, an outer conductor is formed by winding a metal laminated tape while maintaining a 3-core flat structure, and a jacket is coated on the outer conductor.
  • the present invention has been made to solve the above problems, and an object of the present invention is to provide a multi-core parallel cable having a small transmission loss and a method for manufacturing the same.
  • the multi-core parallel cable according to the present invention is a multi-core parallel cable in which a plurality of coaxial wires are arranged side by side in one direction, and a film-shaped outer conductor is provided on the outer periphery of the plurality of coaxial wires.
  • the film-shaped outer conductor is characterized in that, at least a part thereof has a recess along the outer periphery of the coaxial line between the coaxial lines arranged side by side.
  • the film-shaped outer conductor since the film-shaped outer conductor has a recess at least a part thereof along the outer periphery of the coaxial line between the coaxial lines arranged side by side, the volume of the outer conductor located on the outer periphery of the coaxial line is increased.
  • the conductor resistance of the outer conductor becomes smaller and the resistance value of the outer conductor becomes smaller. As a result, the shielding characteristics of the individual coaxial lines can be enhanced and the transmission loss can be reduced.
  • the L / D is in the range of 0.01 to 0.45.
  • the transmission loss can be reduced by arranging the film-shaped outer conductor along the outer circumference of the coaxial line. It is preferably 0.05 to 0.40.
  • the film-shaped outer conductor is vertically wound around the plurality of coaxial wires, and the recess is formed in a portion where the film-shaped outer conductor overlaps. ..
  • the recess is formed in the overlapping portion of the film-shaped outer conductor, the conductor volume of the film-shaped outer conductor along the outer circumference of the coaxial line is increased, the shielding characteristic is further improved, and the transmission loss is reduced. can do.
  • the recesses are formed in two places in the direction orthogonal to the one direction between the adjacent coaxial lines. According to the present invention, since the recesses are formed in two places in the direction perpendicular to one direction (in each of the vertical directions), more film-like outer conductors can be placed along the outer periphery of the coaxial wire, and the shielding characteristics can be improved. It can be further increased and the transmission loss can be reduced.
  • the multi-core parallel cable according to the present invention further has a cover conductor that covers the film-shaped outer conductor.
  • a cover conductor that covers the film-shaped outer conductor since the cover conductor that covers the outer periphery of the film-shaped outer conductor is further provided, it is possible to suppress the vertically attached film-shaped outer conductor from loosening, and it is possible to stabilize the transmission characteristics.
  • the coaxial line is composed of a central conductor and an insulator provided on the outer periphery of the central conductor.
  • the insulator preferably has a hollow structure, and the outer diameter can be made smaller.
  • the method for manufacturing a multi-core parallel cable according to the present invention is a method for manufacturing a multi-core parallel cable in which a plurality of coaxial wires are arranged side by side in one direction, and the plurality of coaxial lines are arranged side by side in one direction.
  • the recesses In the method for manufacturing a multi-core parallel cable according to the present invention, it is preferable to form the recesses at two locations in the direction orthogonal to the one direction in the step of forming the recesses. According to the present invention, the transmission loss can be further reduced by forming the particles at two locations in a direction orthogonal to one direction (vertical direction).
  • the film-shaped outer conductor located between the coaxial lines is pushed in with a jig to form the recess.
  • a multi-core parallel cable having a small transmission loss and a method for manufacturing the same.
  • it can be preferably used as a differential cable used for automobiles and the like using 5G (5th generation mobile communication system).
  • the multi-core parallel cable 10 As shown in FIGS. 1 and 2, the multi-core parallel cable 10 according to the present invention has a plurality of coaxial wires 3 arranged side by side in one direction, and is in the form of a film on the outer periphery of the plurality of coaxial wires 3.
  • the outer conductor 4 is provided, and the film-shaped outer conductor 4 has a recess 7 between the coaxial lines 3 and 3 arranged side by side, at least a part of which is along the outer periphery of the coaxial line 3.
  • the film-shaped outer conductor 4 constituting the multi-core parallel cable 10 has a recess 7 along the outer periphery of the coaxial line 3 at least a part thereof between the coaxial lines 3 and 3 arranged side by side, the coaxial line 3 has a recess 7.
  • the volume of the outer conductor 4 located on the outer periphery increases, the conductor resistance of the outer conductor 4 decreases, and the resistance value of the outer conductor decreases.
  • the shielding characteristics of the individual coaxial wires 3 are enhanced, and the transmission loss can be reduced.
  • the coaxial line 3 is indispensable for constituting the multi-core parallel cable 10, and is composed of a central conductor 1 and an insulator 2 provided on the outer periphery of the central conductor 1.
  • two or more coaxial wires 3 are arranged side by side next to each other in one direction.
  • Parallel installation means that they are provided side by side, and normally, the adjacent coaxial lines 3 and 3 are in contact with each other, but they do not necessarily have to be in contact with each other.
  • the “plurality” means two or more, and the upper limit is not particularly limited, but the upper limit may be, for example, about six. When used as a differential cable, it is composed of an even number of coaxial wires 3.
  • the central conductor 1 is composed of one strand extending in the longitudinal direction of the coaxial wire 3, or is configured by twisting a plurality of strands.
  • the type of the strand is not particularly limited as long as it is made of a good conductive metal, but is a good conductive metal conductor such as a copper wire, a copper alloy wire, an aluminum wire, an aluminum alloy wire, or a copper-aluminum composite wire, or Those having a plating layer on their surfaces can be preferably mentioned. Copper wire and copper alloy wire are particularly preferable.
  • the plating layer a solder plating layer, a tin plating layer, a gold plating layer, a silver plating layer, a nickel plating layer and the like are preferable.
  • the cross-sectional shape of the wire is not particularly limited, but the cross-sectional shape is preferably circular, but it may be substantially circular or square.
  • the cross-sectional shape of the central conductor 1 is also not particularly limited. It may be circular (including an ellipse) or rectangular, but it is preferably circular.
  • the outer diameter of the central conductor 1 is preferably as large as possible so that the electrical resistance (AC resistance, conductor resistance) becomes small, but in order to reduce the outer diameter of the coaxial line 3, for example, 0.09 to The range of about 1 mm can be mentioned.
  • an insulating film (not shown) may be provided on the surface of the center conductor 1.
  • the type and thickness of the insulating film are not particularly limited, but for example, those that decompose well at the time of soldering are preferable, and thermosetting polyurethane films and the like can be preferably mentioned.
  • the insulator 2 is an insulating layer having a low dielectric constant provided continuously in the longitudinal direction on the outer periphery of the central conductor 1.
  • the material of the insulator 2 is not particularly limited and is arbitrarily selected according to the required impedance characteristics.
  • PFA ⁇ 2.1
  • ETFE ⁇ 2.5
  • F ⁇ P ⁇ 2.1
  • the material of the insulator 2 may contain a colorant.
  • the thickness of the insulator 2 is not particularly limited and is arbitrarily selected according to the required impedance characteristics, but is preferably in the range of, for example, about 0.15 to 1.5 mm.
  • the method for forming the insulator 2 is not particularly limited, but any of the solid structure, the hollow structure, and the foamed structure can be easily formed by extrusion.
  • the hollow structure using a low dielectric constant material can reduce the thickness of the insulator 2 without deteriorating the transmission characteristics, so that the outer diameter of the coaxial wire 3 can be reduced, and as a result, the multi-core parallel cable.
  • the volume of the 10 can be reduced, and the thickness of the multi-core parallel cable 10 can be reduced.
  • FIG. 5 is an example of an insulator 2 having a hollow structure.
  • This hollow structure has a gap portion 2A inside the structure, and the gap portion 2A can be, for example, a cross-sectional form in which the gap portion 2A is surrounded by the inner annular portion 2B, the outer annular portion 2C, and the connecting portion 2D.
  • the gap portion 2A is continuously provided in the insulator 2, but the form thereof may be round or rectangular and is not particularly limited. Since the insulator 2 having such a hollow structure is excellent in lateral pressure strength, it is not easily crushed in the process of forming the recess 7 described later, and the high frequency characteristics can be stabilized.
  • the insulator 2 having a hollow structure can be formed by extruding resin on the outer periphery of the central conductor 1 traveling on the extrusion die.
  • the thickness of each of the inner annular portion 2B, the outer annular portion 2C, and the connecting portion 2D is not particularly limited, but is, for example, in the range of about 0.01 to 0.05 mm, and is outside the formed hollow structure insulator 2.
  • the diameter can be, for example, in the range of about 0.4 to 1.0 mm.
  • the film-shaped outer conductor 4 (hereinafter referred to as “outer conductor 4”) is provided on the outer periphery of the plurality of coaxial wires 3 so as to cover the plurality of coaxial wires 3. ..
  • the outer conductor 4 has a recess 7 having a recess provided between the coaxial wires 3 and 3 arranged side by side so that at least a part thereof is provided along the outer periphery of the coaxial wire 3. Due to the presence of the recess 7, the outer conductor 4 runs along the outer periphery of the coaxial line 3 for a long time.
  • the volume of the outer conductor 4 located on the outer periphery of the coaxial line 3 increases as compared with the case without the recess 7, and the outer conductor The conductor resistance of 4 becomes smaller and the resistance value of the outer conductor becomes smaller. As a result, the shield characteristics of the individual coaxial wires 3 are enhanced, and the transmission loss can be reduced.
  • the outer conductor 4 is not particularly limited as long as it is in the form of a film that can be vertically attached so as to cover a plurality of coaxial wires 3, but a metal resin tape (in some cases, reference numeral 4 may be used in combination) can be preferably mentioned.
  • the metal resin tape 4 is a resin base material on which a metal layer is provided via an adhesive layer as needed.
  • the resin base material is not particularly limited, but a polyester film such as polyethylene terephthalate or polyethylene naphthalate can be preferably used.
  • the thickness of the resin base material is arbitrarily selected from those in the range of, for example, about 2 to 20 ⁇ m.
  • the adhesive layer arbitrarily provided is not particularly limited, but is preferably an adhesive layer capable of heat bonding.
  • urethane-based adhesives, epoxy-based adhesives, acrylic-based adhesives and the like can be mentioned.
  • the metal layer a copper layer, an aluminum layer and the like can be preferably mentioned.
  • the metal layer may be a metal layer formed on a resin base material by vapor deposition or plating, or a metal foil bonded via an adhesive layer (for example, a polyester-based thermoplastic adhesive resin) provided as needed.
  • an adhesive layer for example, a polyester-based thermoplastic adhesive resin
  • the thickness of the metal layer is not particularly limited and varies depending on the forming means, but the one formed by vapor deposition or plating can be arbitrarily selected from the range of about 2 to 8 ⁇ m, and the metal foil is laminated. Can be arbitrarily selected from the range of about 6 to 16 ⁇ m. Even in such a thin metal layer, the outer conductor 4 is stably held by the cover conductor 5 provided on the thin metal layer so as to cover the coaxial wire 3.
  • the outer conductor 4 is vertically wound around a plurality of coaxial wires 3. As shown in FIG. 3, “vertical attachment” is to wind the outer conductor 4 so as to wrap it along the longitudinal direction of the plurality of coaxial wires 3.
  • the resin base material side is the coaxial wire 3 side and the metal layer side is the cover conductor side.
  • the overlapping portion 8 is a space portion 9 in the vertical direction (between the coaxial lines and the outside before providing the recess). It is desirable that the space is arranged so as to cover the space portion 9 with a length that crosses the space (space surrounded by the conductor 4), and a recess 7 is formed thereafter.
  • the "vertical” and “vertical direction” are the upper and lower sides of the drawing when viewed in a plan view, or the directions thereof.
  • the recesses 7 are formed at one or two places in the direction orthogonal to the above-mentioned one direction, but it is preferably at two places. As shown in FIG. 2B, one place is a form in which recesses 7 are provided on one of the upper and lower sides, and two places are as shown in FIG. 2A. , It is a form in which recesses 7 are provided on both the upper and lower sides. In particular, since it is formed at two locations, the outer conductor 4 can be made longer and more along the outer circumference of the coaxial line 3, the shield characteristics can be further improved, and the transmission loss can be reduced.
  • the L / D is preferably in the range of 0.01 to 0.45. By keeping it within this range, the film-shaped outer conductor 4 can be made longer along the outer circumference of the coaxial line 3 to reduce the transmission loss.
  • the more preferable L / D is 0.05 to 0.40. In particular, when the L / D exceeds 0.45, the return loss due to reflection becomes large, so that the effect of improving the transmission loss is limited. When the L / D is 0.40 or less, the influence of the return loss due to the reflection is small, so that the transmission loss can be effectively suppressed. As shown in FIG.
  • the recess amount L is a straight line connecting the uppermost two points P1 and P2 of each of the outer conductors 4 in contact with the coaxial lines 3 and 3, and the bottom point P3 which is the lowermost point of the concave portion 7. The shortest distance.
  • FIG. 6 is a photograph of an example in which the outer conductor 4 is covered with the cover conductor 5 having a braided shield structure.
  • FIG. 6A shows a form in which the outer conductor 4 is exposed by partially cutting the cover conductor 5 made of the braided shield, and in the linear form extending laterally through the center of the outer conductor 4, the outer conductor 4 is exposed.
  • FIG. 6B which is a recessed recess 7, shows a form in which the outer conductor 4 is covered with a cover conductor 5 made of a braided shield.
  • the cover conductor 5 covers the vertically attached outer conductor 4 to prevent slackening and misalignment, it contributes to maintaining stable transmission characteristics.
  • the horizontally wound metal thin wire may be a single layer or laminated, and is not particularly limited, but a single layer is preferable.
  • the thin metal wire constituting the cover conductor 5 is not particularly limited as long as it is a fine metal wire having good conductivity.
  • various fine metal wires typified by tin-plated copper wire and the like can be preferably used.
  • the outer diameter of the thin metal wire may be, for example, one in the range of about 0.04 to 0.1 mm.
  • the number of thin metal wires is also arbitrarily selected depending on whether the structure is a braided structure or a horizontal winding shield structure, the size of the object to be covered, and the like.
  • the outer conductor 4 along the outer circumference of the coaxial wire 3 is less likely to shift due to the cover conductor 5, the distance between the outer conductor 4 and the center conductor 1 is less likely to change even if the outer conductor 4 is bent or unbent. As a result, phase fluctuation is less likely to occur, and deterioration of signal transmission characteristics (attenuation amount, skew) can be suppressed.
  • signal transmission characteristics attenuation amount, skew
  • the outer cover 6 is provided on the outer periphery of the cover conductor 5, and the material thereof is not particularly limited as long as it has an insulating property.
  • a resin tape provided with an adhesive layer on one side may be spirally wound, but preferably, the resin is extruded and provided.
  • various resins applied to a general coaxial cable can be used as the outer body, and for example, a fluorine-based resin such as PFA, ETFE, FEP or the like can be used. It may be a resin, a vinyl chloride resin, a polyolefin resin such as polyethylene, or a polyester resin such as polyethylene terephthalate.
  • the thickness of the outer cover 6 can be, for example, in the range of about 0.1 to 1 mm.
  • the cover conductor 5 When a resin tape is used, it is possible to prevent the cover conductor 5 (particularly in the case of a horizontal winding shield structure) from being displaced by fusing it with the cover conductor 5.
  • the resin tape When a resin tape with a fusion layer is used, the resin tape is wound horizontally with the fusion layer side facing the cover conductor 5.
  • the material of the resin tape include polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyamide (PA), polyimide (PI), polyphenylene sulfide (PPS), and ethylene-ethylene tetrafluoride copolymer (ETFE).
  • the thickness of the resin tape is not particularly limited as long as it is thick enough to secure the required dielectric strength, but can be about 0.004 to 0.01 mm.
  • the fused layer is provided on one side of the resin tape, and examples of the material thereof include thermosetting resins such as polyurethane resin, polyester resin, and polyesterimide resin. The thickness of the fused layer is also not particularly limited, but can be about 0.001 mm.
  • the method for manufacturing a multi-core parallel cable 10 is a method for manufacturing a multi-core parallel cable in which a plurality of coaxial wires 3 are arranged side by side in one direction, and the plurality of coaxial lines 3 are arranged side by side in one direction.
  • the recess 7 it is preferable to form the recess 7 at two locations in the direction orthogonal to the one direction.
  • the two locations are two locations in the vertical direction as shown in FIG. 2A, and the transmission loss can be further reduced.
  • the film-shaped outer conductor 4 is covered after arranging the two coaxial lines 3, as shown in FIG. 3, there is a space 9 between the coaxial lines and the outer conductor 4.
  • the film-shaped outer conductor 4 is pushed by the recess-forming members 20 and 20 shown in FIG. Can be formed.
  • the recess forming member 20 is not particularly limited, but it is convenient to use the pulley as shown in FIG. 4 as the recess forming member 20, and by passing the multi-core parallel cable 10 between the two pulleys, the recess 7 is formed. Can be easily provided at two locations in the vertical direction.
  • the multi-core parallel cable 10 thus obtained has a small transmission loss, it can be preferably used as a differential cable used for automobiles and the like using 5G (5th generation mobile communication system).
  • Example 1 As the coaxial wire 3, a silver-plated annealed copper wire (AWG24) having an outer diameter of 0.501 mm was used as the central conductor 1.
  • AMG24 silver-plated annealed copper wire
  • a PFA resin manufactured by DuPont
  • the gap portion 2A is connected to the inner annular portion 2B and the outer annular portion 2C.
  • a hollow structure having a cross-sectional shape surrounded by the portion 2D was formed.
  • the thickness of the inner annular portion 2B is 0.128 mm
  • the thickness of the outer annular portion 2C is 0.154 mm
  • the thickness of the connecting portion 2D is 0.161 mm
  • the outer diameter D of) was 1.36 mm
  • the void ratio of the void portion 2A was 30% with respect to the area of the entire insulator (entire hollow structure).
  • the dielectric constant ⁇ was about 1.6. In this way, the coaxial line 3 was manufactured.
  • the two coaxial wires 3 produced were arranged so as to be in close contact with each other, and the film-shaped outer conductor 4 was provided so as to vertically attach and wrap the two coaxial wires 3.
  • the outer conductor 4 used a copper foil having a thickness of 0.008 mm was provided on one surface of a PET resin base material having a thickness of 0.004 mm via an adhesive layer, and the width was 2.5 mm and the total thickness was 0.
  • a 0.02 mm metal resin tape 4 was used.
  • the metal resin tape 4 was vertically attached so that the copper foil side was on the coaxial line side and the overlapping portion 8 was formed by a width of 1.4 mm as shown in FIG.
  • the overlapping portion 8 has a length that crosses the space portion 9 in the vertical direction when FIG.
  • FIG. 3 is viewed in a plan view, is arranged so as to cover the space portion 9, and then the recess forming member 20 (pulley) shown in FIG. was used on only one side, and a recess 7 having a recess amount L of 0.0136 mm was formed on only one side (see FIG. 2B).
  • the dent amount L / coaxial line outer diameter D was 0.01.
  • a braided shield was provided as a cover conductor 5 so as to cover the whole.
  • 80 silver-plated annealed copper wires having an outer diameter of 0.10 mm were used.
  • a PFA resin (manufactured by DuPont) layer was extruded to form a 2-core parallel cable 10 having an outer diameter of 2.7 mm and a width of 4.0 mm.
  • Example 2 to 10 A 2-core parallel cable with various dents was produced. Other than that, it was the same as in Example 1.
  • Example 11 In Example 1, the recess forming member 20 (pulley) shown in FIG. 4 was used on both sides to form recesses 7 having a recess amount L of 0.0136 mm on both the upper and lower sides (see FIG. 2A). Other than that, it was the same as in Example 1.
  • the dent amount L / coaxial line outer diameter D was 0.01.
  • Example 12 to 20 A 2-core parallel cable with various dents was produced. Other than that, it was the same as in Example 11.
  • Comparative Example 1 and Comparative Example 2 are examples in which the recess 7 is not provided, and other than that, the same as in Examples 1 and 11, respectively.
  • Tables 1 and 2 The measurement results of the transmission loss are shown in Tables 1 and 2.
  • Tables 1 and 2 For the transmission loss, the attenuation of 1 m of the cable was measured using a network analyzer. Tables 1 and 2 also show the coaxial line outer diameter D, the dent amount L, the unit length volume calculated from the dent amount, and the dent amount L / coaxial line outer diameter D.

Abstract

[Problem] To provide a multicore parallel cable having a small transmission loss, and a method for manufacturing the same. [Solution] The problem is solved by a multicore parallel cable 10 comprising a plurality of coaxial cables 3 disposed in parallel in one direction, and a film-like outer conductor 4 provided on an outer periphery of the plurality of coaxial cables 3. The film-like outer conductor 4 includes a recessed portion 7 between the coaxial cables 3, 3 disposed in parallel, at least a part of the recessed portion 7 being disposed along the outer periphery of the coaxial cables 3. Preferably, L/D is in a range of 0.01 to 0.45, where L is the amount of depression of the recessed portion 7 and D is the outer diameter of the coaxial cables 3. Further, the film-like outer conductor 4 is wound longitudinally along the plurality of coaxial cables 3, and the recessed portion 7 is preferably formed in an overlap portion 8 of the film-like outer conductor 4.

Description

多芯平行ケーブル及びその製造方法Multi-core parallel cable and its manufacturing method
　本発明は、伝送損失の小さい多芯平行ケーブル及びその製造方法に関する。 The present invention relates to a multi-core parallel cable having a small transmission loss and a method for manufacturing the same.
　シールド特性に優れた同軸ケーブルとして、外部導体を有する同軸ケーブルが知られている。優れたシールド特性は、図７に示すように、中心導体１の外周を絶縁体２で被覆した２本の同軸線３を並列させた２芯平行ケーブルにおいても同様に要求され、例えば特許文献１，２で提案されている。なお、本願の図７に示す２芯平行ケーブル１０は、絶縁体２として中空構造のものを例示している。 As a coaxial cable with excellent shield characteristics, a coaxial cable having an external conductor is known. As shown in FIG. 7, excellent shielding characteristics are similarly required for a two-core parallel cable in which two coaxial wires 3 in which the outer periphery of the central conductor 1 is covered with an insulator 2 are arranged in parallel. For example, Patent Document 1 , 2 is proposed. The 2-core parallel cable 10 shown in FIG. 7 of the present application exemplifies a hollow structure as the insulator 2.
　特許文献１には、内部導体の外周を絶縁体で被覆したコアを２本並列に配列し、これら２本のコアの外周に、プラスチックテープの片面又は両面に金属蒸着層が形成される第１の複合テープを、その金属蒸着層が外側となるように縦添えし、第１の複合テープの外周に横巻シールドを施し、その横巻シールドの外周に、プラスチックテープの片面又は両面に金属蒸着層が形成される第２の複合テープを、その金属蒸着層が内側となるように巻き付け、第２の複合テープの外周をジャケットで被覆してなる２芯平行ケーブルが提案されている。 In Patent Document 1, two cores in which the outer periphery of the inner conductor is covered with an insulator are arranged in parallel, and a metal vapor deposition layer is formed on one or both sides of a plastic tape on the outer periphery of these two cores. The composite tape of No. 1 is vertically attached so that the metal vapor deposition layer is on the outside, a horizontal winding shield is applied to the outer periphery of the first composite tape, and metal vapor deposition is performed on one or both sides of the plastic tape on the outer periphery of the horizontal winding shield. A two-core parallel cable is proposed in which a second composite tape on which a layer is formed is wound so that the metal vapor deposition layer is on the inside, and the outer circumference of the second composite tape is covered with a jacket.
　特許文献２には、中心導体の外周に、長手方向に連続した空隙部（扇面形）を有する絶縁被覆層を設けて信号線とし、これを２芯平行に並べ、更に両信号線の中央谷間部にドレイン線を配置し、３芯フラット構造を保持しつつ金属ラミネートテープの巻回で外部導体を形成し、これにジャケットを被覆してなる高速差動伝送ケーブルが提案されている。 In Patent Document 2, an insulating coating layer having a gap portion (fan surface shape) continuous in the longitudinal direction is provided on the outer periphery of the central conductor to form a signal line, which is arranged in parallel with two cores, and further, a central valley of both signal lines. A high-speed differential transmission cable has been proposed in which a drain wire is arranged in a portion, an outer conductor is formed by winding a metal laminated tape while maintaining a 3-core flat structure, and a jacket is coated on the outer conductor.
特開２００３－３１０４６号公報Japanese Patent Application Laid-Open No. 2003-31046 特開２００８－１０３１７９号公報Japanese Unexamined Patent Publication No. 2008-103179
　こうした２芯平行ケーブルにおいて、伝送特性のさらなる向上が要請され、特に５Ｇ（第５世代移動通信システム）を利用した自動車に用いる差動ケーブル等として、伝送損失をより小さくできる２芯平行ケーブル等の多芯平行ケーブルの開発が期待されている。 Further improvement of transmission characteristics is required for such a 2-core parallel cable, and in particular, as a differential cable or the like used for an automobile using 5G (5th generation mobile communication system), a 2-core parallel cable or the like that can further reduce a transmission loss. The development of multi-core parallel cables is expected.
　本発明は、上記課題を解決するためになされたものであって、その目的は、伝送損失の小さい多芯平行ケーブル及びその製造方法を提供することにある。 The present invention has been made to solve the above problems, and an object of the present invention is to provide a multi-core parallel cable having a small transmission loss and a method for manufacturing the same.
　（１）本発明に係る多芯平行ケーブルは、複数の同軸線が一方向に並設された多芯平行ケーブルであって、前記複数の同軸線の外周にはフィルム状の外部導体が設けられ、前記フィルム状の外部導体は、並設された前記同軸線間で、少なくともその一部が前記同軸線の外周に沿う凹部を有する、ことを特徴とする。 (1) The multi-core parallel cable according to the present invention is a multi-core parallel cable in which a plurality of coaxial wires are arranged side by side in one direction, and a film-shaped outer conductor is provided on the outer periphery of the plurality of coaxial wires. The film-shaped outer conductor is characterized in that, at least a part thereof has a recess along the outer periphery of the coaxial line between the coaxial lines arranged side by side.
　この発明によれば、フィルム状の外部導体は、並設された前記同軸線間で少なくともその一部が同軸線の外周に沿う凹部を有するので、同軸線の外周に位置する外部導体の体積が増し、外部導体の導体抵抗が小さくなって外部導体の抵抗値が小さくなる。その結果、個々の同軸線のシールド特性が高まって伝送損失を小さくすることができる。 According to the present invention, since the film-shaped outer conductor has a recess at least a part thereof along the outer periphery of the coaxial line between the coaxial lines arranged side by side, the volume of the outer conductor located on the outer periphery of the coaxial line is increased. In addition, the conductor resistance of the outer conductor becomes smaller and the resistance value of the outer conductor becomes smaller. As a result, the shielding characteristics of the individual coaxial lines can be enhanced and the transmission loss can be reduced.
　本発明に係る多芯平行ケーブルにおいて、前記凹部の凹み量をＬとし、前記同軸線の外径をＤとしたとき、Ｌ／Ｄが０．０１～０．４５の範囲内である。この発明によれば、Ｌ／Ｄが上記範囲であるので、フィルム状の外部導体を同軸線の外周に沿わせて伝送損失を小さくすることができる。なお、好ましくは、０．０５～０．４０である。 In the multi-core parallel cable according to the present invention, when the recess amount of the recess is L and the outer diameter of the coaxial line is D, the L / D is in the range of 0.01 to 0.45. According to the present invention, since the L / D is in the above range, the transmission loss can be reduced by arranging the film-shaped outer conductor along the outer circumference of the coaxial line. It is preferably 0.05 to 0.40.
　本発明に係る多芯平行ケーブルにおいて、前記フィルム状の外部導体は、前記複数の同軸線に縦添えで巻き付けられており、前記凹部は、前記フィルム状の外部導体が重なる部分に形成されている。この発明によれば、凹部がフィルム状の外部導体の重なり部分に形成されているので、同軸線の外周に沿うフィルム状の外部導体の導体体積が増し、シールド特性をより高めて伝送損失を小さくすることができる。 In the multi-core parallel cable according to the present invention, the film-shaped outer conductor is vertically wound around the plurality of coaxial wires, and the recess is formed in a portion where the film-shaped outer conductor overlaps. .. According to the present invention, since the recess is formed in the overlapping portion of the film-shaped outer conductor, the conductor volume of the film-shaped outer conductor along the outer circumference of the coaxial line is increased, the shielding characteristic is further improved, and the transmission loss is reduced. can do.
　本発明に係る多芯平行ケーブルにおいて、隣り合う前記同軸線間において、前記凹部は前記一方向に直行する方向に２か所形成されている。この発明によれば、凹部が一方向に直行する方向（上下方向それぞれ）に２か所形成されているので、フィルム状の外部導体を同軸線の外周により多く沿わせることができ、シールド特性をより高めて伝送損失を小さくすることができる。 In the multi-core parallel cable according to the present invention, the recesses are formed in two places in the direction orthogonal to the one direction between the adjacent coaxial lines. According to the present invention, since the recesses are formed in two places in the direction perpendicular to one direction (in each of the vertical directions), more film-like outer conductors can be placed along the outer periphery of the coaxial wire, and the shielding characteristics can be improved. It can be further increased and the transmission loss can be reduced.
　本発明に係る多芯平行ケーブルにおいて、前記フィルム状の外部導体を覆うカバー導体をさらに有する。この発明によれば、フィルム状の外部導体の外周を覆うカバー導体をさらに有するので、縦添えしたフィルム状の外部導体が弛むのを抑えることができ、伝送特性を安定させることができる。 The multi-core parallel cable according to the present invention further has a cover conductor that covers the film-shaped outer conductor. According to the present invention, since the cover conductor that covers the outer periphery of the film-shaped outer conductor is further provided, it is possible to suppress the vertically attached film-shaped outer conductor from loosening, and it is possible to stabilize the transmission characteristics.
　本発明に係る多芯平行ケーブルにおいて、前記同軸線が、中心導体と、該中心導体の外周に設けられた絶縁体とで構成されている。この絶縁体は、中空構造であることが好ましく、外径をより小さくすることができる。 In the multi-core parallel cable according to the present invention, the coaxial line is composed of a central conductor and an insulator provided on the outer periphery of the central conductor. The insulator preferably has a hollow structure, and the outer diameter can be made smaller.
　（２）本発明に係る多芯平行ケーブルの製造方法は、複数の同軸線が一方向に並設された多芯平行ケーブルの製造方法であって、前記複数の同軸線を一方向に並設する工程と、並設した前記同軸線をフィルム状の外部導体を縦添えして覆う工程と、縦添えした前記フィルム状の外部導体のうち前記同軸線間に位置する部分に凹部を形成する工程と、前記凹部を設けた後に前記フィルム状の外部導体を覆うカバー導体を設ける工程とを少なくとも有することを特徴とする。 (2) The method for manufacturing a multi-core parallel cable according to the present invention is a method for manufacturing a multi-core parallel cable in which a plurality of coaxial wires are arranged side by side in one direction, and the plurality of coaxial lines are arranged side by side in one direction. A step of vertically attaching a film-shaped outer conductor to cover the coaxial wires arranged side by side, and a step of forming a recess in a portion of the vertically attached film-shaped outer conductor located between the coaxial lines. It is characterized by having at least a step of providing a cover conductor for covering the film-shaped outer conductor after providing the recess.
　本発明に係る多芯平行ケーブルの製造方法は、前記凹部を形成する工程において、前記凹部を、前記一方向に直行する方向の２か所に形成することが好ましい。この発明によれば、一方向に直行する方向（上下方向）の２か所に形成することで、伝送損失をより小さくすることができる。 In the method for manufacturing a multi-core parallel cable according to the present invention, it is preferable to form the recesses at two locations in the direction orthogonal to the one direction in the step of forming the recesses. According to the present invention, the transmission loss can be further reduced by forming the particles at two locations in a direction orthogonal to one direction (vertical direction).
　本発明に係る多芯平行ケーブルの製造方法は、前記凹部を形成する工程において、前記同軸線間に位置する前記フィルム状の外部導体を治具で押し込んで前記凹部を形成する。 In the method for manufacturing a multi-core parallel cable according to the present invention, in the step of forming the recess, the film-shaped outer conductor located between the coaxial lines is pushed in with a jig to form the recess.
　本発明によれば、伝送損失の小さい多芯平行ケーブル及びその製造方法を提供することができる。特に５Ｇ（第５世代移動通信システム）を利用した自動車等に用いる差動ケーブルとして好ましく利用できる。 According to the present invention, it is possible to provide a multi-core parallel cable having a small transmission loss and a method for manufacturing the same. In particular, it can be preferably used as a differential cable used for automobiles and the like using 5G (5th generation mobile communication system).
本発明に係る多芯平行ケーブルの一例（２芯平行ケーブル）を示す断面構成図である。It is sectional drawing which shows an example (two-core parallel cable) of the multi-core parallel cable which concerns on this invention. フィルム状の外部導体に凹部を設けた例であり、（Ａ）は上下両側に凹部を設けた場合であり、（Ｂ）は片側に凹部を設けた場合である。This is an example in which a recess is provided in the film-shaped outer conductor, (A) is a case where recesses are provided on both the upper and lower sides, and (B) is a case where a recess is provided on one side. フィルム状の外部導体が重なった部分に凹部を設けた例である。This is an example in which a recess is provided in a portion where film-shaped outer conductors overlap. フィルム状の外部導体に凹部を形成する方法である。This is a method of forming a recess in a film-shaped outer conductor. 同軸線を構成する絶縁体を中空構造体とした一例を示す断面図である。It is sectional drawing which shows an example which made the insulator which constitutes a coaxial line into a hollow structure. 外被体を設ける前の２芯平行ケーブルの形態を示す写真である。It is a photograph which shows the form of the 2-core parallel cable before the outer cover is provided. 従来の２芯平行ケーブルの一例を示す断面構成図である。It is sectional drawing which shows an example of the conventional two-core parallel cable.
　本発明に係る多芯平行ケーブル及び製造方法の実施形態について、図面を参照しつつ説明する。なお、本発明は、以下に説明する実施形態及び図面に記載した形態と同じ技術的思想の発明を含むものであり、本発明の技術的範囲は実施形態の記載や図面の記載のみに限定されるものでない。 An embodiment of the multi-core parallel cable and the manufacturing method according to the present invention will be described with reference to the drawings. In addition, the present invention includes the invention of the same technical idea as the embodiment described below and the embodiment described in the drawings, and the technical scope of the present invention is limited to the description of the embodiment and the description of the drawings. Not a thing.
　［多芯平行ケーブル］
　本発明に係る多芯平行ケーブル１０は、図１及び図２に示すように、複数の同軸線３が一方向に並設されたものであって、複数の同軸線３の外周にはフィルム状の外部導体４が設けられ、そのフィルム状の外部導体４は、並設された同軸線３，３間で、少なくともその一部が同軸線３の外周に沿う凹部７を有する。 [Multi-core parallel cable]
As shown in FIGS. 1 and 2, the multi-core parallel cable 10 according to the present invention has a plurality of coaxial wires 3 arranged side by side in one direction, and is in the form of a film on the outer periphery of the plurality of coaxial wires 3. The outer conductor 4 is provided, and the film-shaped outer conductor 4 has a recess 7 between the coaxial lines 3 and 3 arranged side by side, at least a part of which is along the outer periphery of the coaxial line 3.
　この多芯平行ケーブル１０を構成するフィルム状の外部導体４は、並設された同軸線３，３間で少なくともその一部が同軸線３の外周に沿う凹部７を有するので、同軸線３の外周に位置する外部導体４の体積が増し、外部導体４の導体抵抗が小さくなって外部導体の抵抗値が小さくなる。その結果、個々の同軸線３のシールド特性が高まって伝送損失を小さくすることができる。 Since the film-shaped outer conductor 4 constituting the multi-core parallel cable 10 has a recess 7 along the outer periphery of the coaxial line 3 at least a part thereof between the coaxial lines 3 and 3 arranged side by side, the coaxial line 3 has a recess 7. The volume of the outer conductor 4 located on the outer periphery increases, the conductor resistance of the outer conductor 4 decreases, and the resistance value of the outer conductor decreases. As a result, the shielding characteristics of the individual coaxial wires 3 are enhanced, and the transmission loss can be reduced.
　以下、各構成要素を説明する。 Each component will be described below.
　＜同軸線＞
　同軸線３は、多芯平行ケーブル１０を構成する必須のものであり、中心導体１と、中心導体１の外周に設けられた絶縁体２とで構成されている。本発明に係る多芯平行ケーブル１０において、この同軸線３は、図１に示すように、一方向に隣り合って２以上並設される。「並設」とは、並んで設けられることを意味し、通常は、隣り合う同軸線３，３同士は接触しているが、必ずしも接触していなくても構わない。「複数」とは、２以上を意味するが、上限は特に限定されえないが、上限としては例えば６本程度を例示できる。差動ケーブルとして利用する場合は、偶数の同軸線３で構成される。 <Coaxial line>
The coaxial line 3 is indispensable for constituting the multi-core parallel cable 10, and is composed of a central conductor 1 and an insulator 2 provided on the outer periphery of the central conductor 1. In the multi-core parallel cable 10 according to the present invention, as shown in FIG. 1, two or more coaxial wires 3 are arranged side by side next to each other in one direction. "Parallel installation" means that they are provided side by side, and normally, the adjacent coaxial lines 3 and 3 are in contact with each other, but they do not necessarily have to be in contact with each other. The “plurality” means two or more, and the upper limit is not particularly limited, but the upper limit may be, for example, about six. When used as a differential cable, it is composed of an even number of coaxial wires 3.
　（中心導体）
　中心導体１は、同軸線３の長手方向に延びる１本の素線で構成されるもの、又は複数本の素線を撚り合わせて構成されるものである。素線は、良導電性金属からなるものであればその種類は特に限定されないが、銅線、銅合金線、アルミニウム線、アルミニウム合金線、銅アルミニウム複合線等の良導電性の金属導体、又はそれらの表面にめっき層が施されたものを好ましく挙げることができる。銅線、銅合金線が特に好ましい。めっき層としては、はんだめっき層、錫めっき層、金めっき層、銀めっき層、ニッケルめっき層等が好ましい。素線の断面形状も特に限定されないが、断面形状が円形であることが好ましいが、略円形であっても角形形状であってもよい。 (Center conductor)
The central conductor 1 is composed of one strand extending in the longitudinal direction of the coaxial wire 3, or is configured by twisting a plurality of strands. The type of the strand is not particularly limited as long as it is made of a good conductive metal, but is a good conductive metal conductor such as a copper wire, a copper alloy wire, an aluminum wire, an aluminum alloy wire, or a copper-aluminum composite wire, or Those having a plating layer on their surfaces can be preferably mentioned. Copper wire and copper alloy wire are particularly preferable. As the plating layer, a solder plating layer, a tin plating layer, a gold plating layer, a silver plating layer, a nickel plating layer and the like are preferable. The cross-sectional shape of the wire is not particularly limited, but the cross-sectional shape is preferably circular, but it may be substantially circular or square.
　中心導体１の断面形状も特に限定されない。円形（楕円形を含む。）であってもよいし矩形等であってもよいが、円形であることが好ましい。中心導体１の外径は、電気抵抗（交流抵抗、導体抵抗）が小さくなるように、できるだけ大きいことが望ましいが、同軸線３の外径を細径化するためには、例えば０．０９～１ｍｍ程度の範囲内を挙げることができる。中心導体１の表面には、必要に応じて絶縁皮膜（図示しない）が設けられていてもよい。絶縁皮膜の種類と厚さは特に限定されないが、例えばはんだ付け時に良好に分解するものが好ましく、熱硬化性ポリウレタン皮膜等を好ましく挙げることができる。 The cross-sectional shape of the central conductor 1 is also not particularly limited. It may be circular (including an ellipse) or rectangular, but it is preferably circular. The outer diameter of the central conductor 1 is preferably as large as possible so that the electrical resistance (AC resistance, conductor resistance) becomes small, but in order to reduce the outer diameter of the coaxial line 3, for example, 0.09 to The range of about 1 mm can be mentioned. If necessary, an insulating film (not shown) may be provided on the surface of the center conductor 1. The type and thickness of the insulating film are not particularly limited, but for example, those that decompose well at the time of soldering are preferable, and thermosetting polyurethane films and the like can be preferably mentioned.
　（絶縁体）
　絶縁体２は、中心導体１の外周に、長手方向に連続して設けられている低誘電率の絶縁層である。絶縁体２の材料は特に限定されず、要求されるインピーダンス特性に応じて任意に選択されるが、例えばＰＦＡ（ε２．１）、ＥＴＦＥ（ε２．５）、ＦΕＰ（ε２．１）等、誘電率が２．０～２．５の低誘電率のフッ素系樹脂が好ましく、なかでも、ＰＦＡ樹脂が好ましい。なお、絶縁体２の材料に着色剤を含有させてもよい。絶縁体２の厚さも特に限定されず、要求されるインピーダンス特性に応じて任意に選択されるが、例えば０．１５～１．５ｍｍ程度の範囲内とすることが好ましい。絶縁体２の形成方法は特に限定されないが、中実構造、中空構造、発泡構造のいずれも押し出しで容易に形成できる。特に低誘電率材料を採用した中空構造は、伝送特性を低下させることなく絶縁体２の厚さを薄くできるので、同軸線３の外径を小さくすることができ、その結果、多芯平行ケーブル１０の体積を小さくでき、また、多芯平行ケーブル１０の厚さを薄くすることができる。 (Insulator)
The insulator 2 is an insulating layer having a low dielectric constant provided continuously in the longitudinal direction on the outer periphery of the central conductor 1. The material of the insulator 2 is not particularly limited and is arbitrarily selected according to the required impedance characteristics. For example, PFA (ε2.1), ETFE (ε2.5), FΕP (ε2.1) and the like are dielectric. A fluororesin having a low dielectric constant of 2.0 to 2.5 is preferable, and a PFA resin is particularly preferable. The material of the insulator 2 may contain a colorant. The thickness of the insulator 2 is not particularly limited and is arbitrarily selected according to the required impedance characteristics, but is preferably in the range of, for example, about 0.15 to 1.5 mm. The method for forming the insulator 2 is not particularly limited, but any of the solid structure, the hollow structure, and the foamed structure can be easily formed by extrusion. In particular, the hollow structure using a low dielectric constant material can reduce the thickness of the insulator 2 without deteriorating the transmission characteristics, so that the outer diameter of the coaxial wire 3 can be reduced, and as a result, the multi-core parallel cable. The volume of the 10 can be reduced, and the thickness of the multi-core parallel cable 10 can be reduced.
　図５は、中空構造の絶縁体２の例である。この中空構造は、構造体内部に空隙部２Ａを有し、例えばその空隙部２Ａを、内環状部２Ｂ、外環状部２Ｃ及び連結部２Ｄで囲む断面形態等とすることができる。空隙部２Ａは、絶縁体２の中に連続して設けられているが、その形態は、丸形でも矩形でもよく特に限定されない。こうした中空構造の絶縁体２は、側圧強度に優れるので、後述する凹部７の形成工程等で潰れにくく、高周波特性を安定なものとすることができる。なお、中空構造の絶縁体２は、押出ダイを走行する中心導体１の外周に樹脂押出しして成形することができる。内環状部２Ｂ、外環状部２Ｃ及び連結部２Ｄのそれぞれの厚さは特に限定されないが、例えば０．０１～０．０５ｍｍ程度の範囲内であり、形成された中空構造の絶縁体２の外径は、例えば０．４～１．０ｍｍ程度の範囲内とすることができる。 FIG. 5 is an example of an insulator 2 having a hollow structure. This hollow structure has a gap portion 2A inside the structure, and the gap portion 2A can be, for example, a cross-sectional form in which the gap portion 2A is surrounded by the inner annular portion 2B, the outer annular portion 2C, and the connecting portion 2D. The gap portion 2A is continuously provided in the insulator 2, but the form thereof may be round or rectangular and is not particularly limited. Since the insulator 2 having such a hollow structure is excellent in lateral pressure strength, it is not easily crushed in the process of forming the recess 7 described later, and the high frequency characteristics can be stabilized. The insulator 2 having a hollow structure can be formed by extruding resin on the outer periphery of the central conductor 1 traveling on the extrusion die. The thickness of each of the inner annular portion 2B, the outer annular portion 2C, and the connecting portion 2D is not particularly limited, but is, for example, in the range of about 0.01 to 0.05 mm, and is outside the formed hollow structure insulator 2. The diameter can be, for example, in the range of about 0.4 to 1.0 mm.
　＜フィルム状の外部導体＞
　フィルム状の外部導体４（以下「外部導体４」という。）は、図１及び図２に示すように、複数の同軸線３を覆うように、複数の同軸線３の外周に設けられている。外部導体４は、並設された同軸線３，３間に、少なくともその一部が同軸線３の外周に沿うように設けられた凹みを有する凹部７を有している。この凹部７の存在により、外部導体４は同軸線３の外周に長く沿うことになるので、凹部７のない場合に比べて同軸線３の外周に位置する外部導体４の体積が増し、外部導体４の導体抵抗が小さくなって外部導体の抵抗値が小さくなる。その結果、個々の同軸線３のシールド特性が高まって伝送損失を小さくすることができる。 <Film-shaped outer conductor>
As shown in FIGS. 1 and 2, the film-shaped outer conductor 4 (hereinafter referred to as “outer conductor 4”) is provided on the outer periphery of the plurality of coaxial wires 3 so as to cover the plurality of coaxial wires 3. .. The outer conductor 4 has a recess 7 having a recess provided between the coaxial wires 3 and 3 arranged side by side so that at least a part thereof is provided along the outer periphery of the coaxial wire 3. Due to the presence of the recess 7, the outer conductor 4 runs along the outer periphery of the coaxial line 3 for a long time. Therefore, the volume of the outer conductor 4 located on the outer periphery of the coaxial line 3 increases as compared with the case without the recess 7, and the outer conductor The conductor resistance of 4 becomes smaller and the resistance value of the outer conductor becomes smaller. As a result, the shield characteristics of the individual coaxial wires 3 are enhanced, and the transmission loss can be reduced.
　外部導体４は、複数の同軸線３を覆うように縦添えできるフィルム状のものであれば特に限定されないが、金属樹脂テープ（符号４を併用することがある。）を好ましく挙げることができる。金属樹脂テープ４とは、樹脂基材上に必要に応じて接着剤層を介して金属層を設けたものである。樹脂基材は特に限定されないが、ポリエチレンテレフタレートやポリエチレンナフタレート等のポリエステルフィルムを好ましく用いることができる。 The outer conductor 4 is not particularly limited as long as it is in the form of a film that can be vertically attached so as to cover a plurality of coaxial wires 3, but a metal resin tape (in some cases, reference numeral 4 may be used in combination) can be preferably mentioned. The metal resin tape 4 is a resin base material on which a metal layer is provided via an adhesive layer as needed. The resin base material is not particularly limited, but a polyester film such as polyethylene terephthalate or polyethylene naphthalate can be preferably used.
　樹脂基材の厚さは、例えば２～２０μｍ程度の範囲内のものから任意に選択される。任意に設けられる接着剤層も特に限定されないが、加熱接着が可能な接着剤層であることが好ましい。例えば、ウレタン系接着剤、エポキシ系接着剤、アクリル系接着剤等を挙げることができる。 The thickness of the resin base material is arbitrarily selected from those in the range of, for example, about 2 to 20 μm. The adhesive layer arbitrarily provided is not particularly limited, but is preferably an adhesive layer capable of heat bonding. For example, urethane-based adhesives, epoxy-based adhesives, acrylic-based adhesives and the like can be mentioned.
　金属層は、銅層、アルミニウム層等を好ましく挙げることができる。金属層は、樹脂基材上に蒸着やめっきにより成膜されたもの、又は必要に応じて設けられた接着剤層（例えばポリエステル系熱可塑性接着性樹脂等）を介して貼り合わされた金属箔等を好ましく挙げることができる。金属層の厚さは特に限定されず、形成手段によっても異なるが、蒸着やめっきで成膜したものは２～８μｍ程度の範囲内から任意に選択することができ、金属箔を貼り合わせたものは６～１６μｍ程度の範囲内から任意に選択することができる。なお、こうした薄い金属層であっても、その上に設けられるカバー導体５により、外部導体４は、同軸線３を覆う態様で安定的に保持される。 As the metal layer, a copper layer, an aluminum layer and the like can be preferably mentioned. The metal layer may be a metal layer formed on a resin base material by vapor deposition or plating, or a metal foil bonded via an adhesive layer (for example, a polyester-based thermoplastic adhesive resin) provided as needed. Can be preferably mentioned. The thickness of the metal layer is not particularly limited and varies depending on the forming means, but the one formed by vapor deposition or plating can be arbitrarily selected from the range of about 2 to 8 μm, and the metal foil is laminated. Can be arbitrarily selected from the range of about 6 to 16 μm. Even in such a thin metal layer, the outer conductor 4 is stably held by the cover conductor 5 provided on the thin metal layer so as to cover the coaxial wire 3.
　（縦添え）
　外部導体４は、複数の同軸線３に縦添えで巻き付けられている。「縦添え」は、図３に示すように、外部導体４を複数の同軸線３の長手方向に添わせて包むように巻くことである。外部導体４として縦添えする場合、樹脂基材側を同軸線３側とし、金属層側をカバー導体側とすることが好ましい。こうすることにより、外部導体４を構成する金属層と、カバー導体５とが接触して導通するという利点がある。縦添えでは、その一部に重なり部分８があるように巻かれるが、その重なり部分８は、図３に示すように、上下方向の空間部９（凹部を設ける前の、同軸線間と外部導体４とで囲まれた空間）を渡る長さで、その空間部９を覆うように配置し、その後に凹部７を形成したものであることが望ましい。なお、「上下」及び「上下方向」とは、図面を平面視した場合の上と下、又はその方向のことである。 (Vertical attachment)
The outer conductor 4 is vertically wound around a plurality of coaxial wires 3. As shown in FIG. 3, "vertical attachment" is to wind the outer conductor 4 so as to wrap it along the longitudinal direction of the plurality of coaxial wires 3. When vertically attached as the outer conductor 4, it is preferable that the resin base material side is the coaxial wire 3 side and the metal layer side is the cover conductor side. By doing so, there is an advantage that the metal layer constituting the outer conductor 4 and the cover conductor 5 are in contact with each other to conduct conduction. In the vertical attachment, the overlapping portion 8 is wound so as to have an overlapping portion 8, and as shown in FIG. 3, the overlapping portion 8 is a space portion 9 in the vertical direction (between the coaxial lines and the outside before providing the recess). It is desirable that the space is arranged so as to cover the space portion 9 with a length that crosses the space (space surrounded by the conductor 4), and a recess 7 is formed thereafter. The "vertical" and "vertical direction" are the upper and lower sides of the drawing when viewed in a plan view, or the directions thereof.
　（凹部）
　凹部７は、前記した一方向に直行する方向に１か所又は２か所形成されるが、２か所であることが好ましい。１か所とは、図２（Ｂ）に示すように、上下の一方の側に凹部７が設けられている形態のことであり、２か所とは、図２（Ａ）に示すように、上下の両方に凹部７が設けられている形態のことである。特に２か所形成されていることにより、同軸線３の外周に外部導体４をより長く且つより多く沿わせることができ、シールド特性をより高めて伝送損失を小さくすることができる。 (Recess)
The recesses 7 are formed at one or two places in the direction orthogonal to the above-mentioned one direction, but it is preferably at two places. As shown in FIG. 2B, one place is a form in which recesses 7 are provided on one of the upper and lower sides, and two places are as shown in FIG. 2A. , It is a form in which recesses 7 are provided on both the upper and lower sides. In particular, since it is formed at two locations, the outer conductor 4 can be made longer and more along the outer circumference of the coaxial line 3, the shield characteristics can be further improved, and the transmission loss can be reduced.
　凹部７の凹み量をＬとし、同軸線３の外径をＤとしたとき、Ｌ／Ｄが０．０１～０．４５の範囲内であることが好ましい。この範囲内にすることにより、フィルム状の外部導体４を同軸線３の外周により長く沿わせて伝送損失を小さくすることができる。なお、より好ましいＬ／Ｄは、０．０５～０．４０である。特に、Ｌ／Ｄが０．４５を超えると、反射によるリターンロスが大きくなるため、伝送損失の向上効果は限定的となる。Ｌ／Ｄが０．４０以下の場合には、反射によるリターンロスの影響は小さいために、伝送損失を効果的に抑制することが可能である。なお、凹み量Ｌは、図２に示すように、同軸線３，３と接した外部導体４の各々の最上の２点Ｐ１，Ｐ２を結んだ直線と凹部７の最下部となる底点Ｐ３の最短距離とする。 When the amount of the recess 7 is L and the outer diameter of the coaxial wire 3 is D, the L / D is preferably in the range of 0.01 to 0.45. By keeping it within this range, the film-shaped outer conductor 4 can be made longer along the outer circumference of the coaxial line 3 to reduce the transmission loss. The more preferable L / D is 0.05 to 0.40. In particular, when the L / D exceeds 0.45, the return loss due to reflection becomes large, so that the effect of improving the transmission loss is limited. When the L / D is 0.40 or less, the influence of the return loss due to the reflection is small, so that the transmission loss can be effectively suppressed. As shown in FIG. 2, the recess amount L is a straight line connecting the uppermost two points P1 and P2 of each of the outer conductors 4 in contact with the coaxial lines 3 and 3, and the bottom point P3 which is the lowermost point of the concave portion 7. The shortest distance.
　＜カバー導体＞
　カバー導体５は、外部導体４上に、金属細線の編組構造又は金属細線の横巻シールド構造で形成される。図６は、編組シールド構造のカバー導体５で外部導体４を覆っている例の写真である。図６（Ａ）は、編組シールドからなるカバー導体５を一部切断して外部導体４が露出した形態であり、外部導体４の中央を横方向に延びる線状の形態は、外部導体４が凹んだ凹部７である、図６（Ｂ）は、外部導体４が編組シールドからなるカバー導体５で覆われた形態である。カバー導体５は、縦添えされた外部導体４を覆って弛みや位置ずれを防ぐので、安定した伝送特性を維持するのに寄与する。なお、横巻シールド構造の場合、横巻した金属細線は、単層でも積層でもよく特に限定されないが、単層が好ましい。 <Cover conductor>
The cover conductor 5 is formed on the outer conductor 4 by a braided structure of fine metal wires or a horizontal winding shield structure of fine metal wires. FIG. 6 is a photograph of an example in which the outer conductor 4 is covered with the cover conductor 5 having a braided shield structure. FIG. 6A shows a form in which the outer conductor 4 is exposed by partially cutting the cover conductor 5 made of the braided shield, and in the linear form extending laterally through the center of the outer conductor 4, the outer conductor 4 is exposed. FIG. 6B, which is a recessed recess 7, shows a form in which the outer conductor 4 is covered with a cover conductor 5 made of a braided shield. Since the cover conductor 5 covers the vertically attached outer conductor 4 to prevent slackening and misalignment, it contributes to maintaining stable transmission characteristics. In the case of the horizontally wound shield structure, the horizontally wound metal thin wire may be a single layer or laminated, and is not particularly limited, but a single layer is preferable.
　カバー導体５を構成する金属細線は、良導電性の金属細線であれば特に限定されない。例えば、錫めっき銅線等に代表される各種の金属細線を好ましく用いることができる。金属細線の外径は、例えば０．０４～０．１ｍｍ程度の範囲内のものを挙げることができる。金属細線の本数も、編組構造とするか横巻シールド構造とするか、また、覆う対象物の大きさ等によって任意に選択される。 The thin metal wire constituting the cover conductor 5 is not particularly limited as long as it is a fine metal wire having good conductivity. For example, various fine metal wires typified by tin-plated copper wire and the like can be preferably used. The outer diameter of the thin metal wire may be, for example, one in the range of about 0.04 to 0.1 mm. The number of thin metal wires is also arbitrarily selected depending on whether the structure is a braided structure or a horizontal winding shield structure, the size of the object to be covered, and the like.
　カバー導体５によって、同軸線３の外周に沿う外部導体４がずれ難いので、曲げや曲げ戻しをしても、外部導体４と中心導体１との距離が変化し難い。その結果、位相変動が起きにくく、信号伝送特性（減衰量、スキュー）の低下を抑制することができる。特に差動信号を高速で伝送させる２芯平行ケーブルでは、信号伝送速度が２本の間で変化するのを抑制して伝送特性が低下してしまうのを防ぐことができる。 Since the outer conductor 4 along the outer circumference of the coaxial wire 3 is less likely to shift due to the cover conductor 5, the distance between the outer conductor 4 and the center conductor 1 is less likely to change even if the outer conductor 4 is bent or unbent. As a result, phase fluctuation is less likely to occur, and deterioration of signal transmission characteristics (attenuation amount, skew) can be suppressed. In particular, in a two-core parallel cable that transmits a differential signal at high speed, it is possible to suppress the signal transmission speed from changing between the two cables and prevent the transmission characteristics from deteriorating.
　＜外被体＞
　外被体６は、カバー導体５の外周に設けられ、絶縁性があればその材質は特に限定されない。片面に接着剤層を設けた樹脂テープを螺旋巻きして設けてもよいが、好ましくは、樹脂を押出して設ける。外被体６の構成樹脂としては、樹脂押出の場合は、外被体として一般的な同軸ケーブルに適用されている種々のものを使用することができ、例えばＰＦＡ、ＥＴＦＥ、ＦＥＰ等のフッ素系樹脂であってもよいし、塩化ビニル樹脂であってもよいし、ポリエチレン等のポリオレフィン樹脂であってもよいし、ポリエチレンテレフタレート等のポリエステル樹脂であってもよい。外被体６の厚さは、例えば０．１～１ｍｍ程度の範囲内とすることができる。 <Outer body>
The outer cover 6 is provided on the outer periphery of the cover conductor 5, and the material thereof is not particularly limited as long as it has an insulating property. A resin tape provided with an adhesive layer on one side may be spirally wound, but preferably, the resin is extruded and provided. As the constituent resin of the outer body 6, in the case of resin extrusion, various resins applied to a general coaxial cable can be used as the outer body, and for example, a fluorine-based resin such as PFA, ETFE, FEP or the like can be used. It may be a resin, a vinyl chloride resin, a polyolefin resin such as polyethylene, or a polyester resin such as polyethylene terephthalate. The thickness of the outer cover 6 can be, for example, in the range of about 0.1 to 1 mm.
　なお、樹脂テープを用いる場合は、カバー導体５と融着させることでカバー導体５（特に横巻シールド構造の場合）が位置ずれするのを防ぐことができる。融着層付きの樹脂テープを用いる場合、融着層の側をカバー導体５の側にして横巻きする。樹脂テープの材質としては、例えば、ポリエチレンテレフタレート（ＰＥＴ）、ポリエチレンナフタレート（ＰＥＮ）、ポリアミド（ＰＡ）、ポリイミド（ＰＩ）、ポリフェニレンサルファイド（ＰＰＳ）、エチレン－四フッ化エチレン共重合体（ＥＴＦＥ）、四フッ化エチレン－六フッ化プロピレン共重合体（ＦＥＰ）、フッ素化樹脂共重合体（ペルフルオロアルコキシフッ素樹脂：ＰＦＡ）、ポリエーテルエーテルケトン（ＰＥＥＫ）、等を挙げることができる。樹脂テープの厚さは、必要な絶縁耐圧を確保できるだけの厚さであれば特に限定されないが、０．００４～０．０１ｍｍ程度とすることができる。融着層は、樹脂テープの片面に設けられ、その材質としては、例えば、ポリウレタン樹脂、ポリエステル樹脂、ポリエステルイミド樹脂等の熱硬化性樹脂を挙げることができる。融着層の厚さも特に限定されないが、０．００１ｍｍ程度とすることができる。 When a resin tape is used, it is possible to prevent the cover conductor 5 (particularly in the case of a horizontal winding shield structure) from being displaced by fusing it with the cover conductor 5. When a resin tape with a fusion layer is used, the resin tape is wound horizontally with the fusion layer side facing the cover conductor 5. Examples of the material of the resin tape include polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyamide (PA), polyimide (PI), polyphenylene sulfide (PPS), and ethylene-ethylene tetrafluoride copolymer (ETFE). , Tetrafluorinated ethylene-propylene hexafluorinated copolymer (FEP), fluororesin copolymer (perfluoroalkoxy alkane resin: PFA), polyether ether ketone (PEEK), and the like. The thickness of the resin tape is not particularly limited as long as it is thick enough to secure the required dielectric strength, but can be about 0.004 to 0.01 mm. The fused layer is provided on one side of the resin tape, and examples of the material thereof include thermosetting resins such as polyurethane resin, polyester resin, and polyesterimide resin. The thickness of the fused layer is also not particularly limited, but can be about 0.001 mm.
　［多芯平行ケーブルの製造方法］
　本発明に係る多芯平行ケーブル１０の製造方法は、複数の同軸線３が一方向に並設された多芯平行ケーブルの製造方法であって、複数の同軸線３を一方向に並設する工程と、並設した同軸線３をフィルム状の外部導体４を縦添えして覆う工程と、縦添えしたフィルム状の外部導体４のうち同軸線３，３間に位置する部分に凹部７を形成する工程と、凹部７を設けた後にフィルム状の外部導体４を覆うカバー導体５を設ける工程とを少なくとも有する。なお、それぞれの工程については、「多芯平行ケーブル」の構成要素の説明欄で説明しているのでここではその説明を省略する。 [Manufacturing method of multi-core parallel cable]
The method for manufacturing a multi-core parallel cable 10 according to the present invention is a method for manufacturing a multi-core parallel cable in which a plurality of coaxial wires 3 are arranged side by side in one direction, and the plurality of coaxial lines 3 are arranged side by side in one direction. A step of covering the coaxial wires 3 arranged side by side with a film-shaped outer conductor 4 vertically attached, and a recess 7 in a portion of the vertically attached film-shaped outer conductors 4 located between the coaxial wires 3 and 3. It has at least a step of forming and a step of providing a cover conductor 5 that covers the film-shaped outer conductor 4 after providing the recess 7. Since each step is described in the explanation column of the components of the "multi-core parallel cable", the description thereof will be omitted here.
　各工程のうち、凹部７を形成する工程においては、凹部７を、前記一方向に直行する方向の２か所に形成することが好ましい。２箇所とは、図２（Ａ）に示すような上下方向の２か所であり、伝送損失をより小さくすることができる。 Of each step, in the step of forming the recess 7, it is preferable to form the recess 7 at two locations in the direction orthogonal to the one direction. The two locations are two locations in the vertical direction as shown in FIG. 2A, and the transmission loss can be further reduced.
　２本の同軸線３を並べた後にフィルム状の外部導体４を覆うだけでは、図３に示すように、同軸線間と外部導体４との間に空間部９がある。この工程では、フィルム状の外部導体４を縦添えし、その外部導体４をカバー導体５で覆う際に、図４に示す凹部形成部材２０，２０でフィルム状の外部導体４を押し込んで凹部７を形成することができる。凹部形成部材２０は特に限定されないが、図４に示すような滑車を凹部形成部材２０とすることが便利であり、そうした２つの滑車の間に多芯平行ケーブル１０を通過させることで、凹部７を上下方向の２箇所に容易に設けることができる。 If only the film-shaped outer conductor 4 is covered after arranging the two coaxial lines 3, as shown in FIG. 3, there is a space 9 between the coaxial lines and the outer conductor 4. In this step, when the film-shaped outer conductor 4 is vertically attached and the outer conductor 4 is covered with the cover conductor 5, the film-shaped outer conductor 4 is pushed by the recess-forming members 20 and 20 shown in FIG. Can be formed. The recess forming member 20 is not particularly limited, but it is convenient to use the pulley as shown in FIG. 4 as the recess forming member 20, and by passing the multi-core parallel cable 10 between the two pulleys, the recess 7 is formed. Can be easily provided at two locations in the vertical direction.
　こうして得られた多芯平行ケーブル１０は、伝送損失の小さいので、特に５Ｇ（第５世代移動通信システム）を利用した自動車等に用いる差動ケーブルとして好ましく利用できる。 Since the multi-core parallel cable 10 thus obtained has a small transmission loss, it can be preferably used as a differential cable used for automobiles and the like using 5G (5th generation mobile communication system).
　以下に、実施例を挙げて本発明を更に具体的に説明する。なお、本発明は以下の実施例に限定されるものではない。 Hereinafter, the present invention will be described in more detail with reference to examples. The present invention is not limited to the following examples.
　［実施例１］
　同軸線３は、中心導体１として外径０．５０１ｍｍの銀めっき軟銅線（ＡＷＧ２４）を用いた。絶縁体２は、中空構造体用ダイスニップルにて３５０℃でＰＦＡ樹脂（デュポン社製）を押出しして、図５に示すように、空隙部２Ａが内環状部２Ｂ、外環状部２Ｃ及び連結部２Ｄで囲まれた断面形態の中空構造体を形成した。この中空構造体において、内環状部２Ｂの厚さは０．１２８ｍｍ、外環状部２Ｃの厚さは０．１５４ｍｍ、連結部２Ｄの厚さは０．１６１ｍｍであり、中空構造体（絶縁体２）の外径Ｄは１．３６ｍｍであり、空隙部２Ａの空隙率は絶縁体全体（中空構造体全体）の面積に対して３０％であった。誘電率εは約１．６であった。こうして同軸線３を作製した。 [Example 1]
As the coaxial wire 3, a silver-plated annealed copper wire (AWG24) having an outer diameter of 0.501 mm was used as the central conductor 1. In the insulator 2, a PFA resin (manufactured by DuPont) is extruded at 350 ° C. with a die nipple for a hollow structure, and as shown in FIG. 5, the gap portion 2A is connected to the inner annular portion 2B and the outer annular portion 2C. A hollow structure having a cross-sectional shape surrounded by the portion 2D was formed. In this hollow structure, the thickness of the inner annular portion 2B is 0.128 mm, the thickness of the outer annular portion 2C is 0.154 mm, the thickness of the connecting portion 2D is 0.161 mm, and the hollow structure (insulator 2). The outer diameter D of) was 1.36 mm, and the void ratio of the void portion 2A was 30% with respect to the area of the entire insulator (entire hollow structure). The dielectric constant ε was about 1.6. In this way, the coaxial line 3 was manufactured.
　作製した同軸線３を２本密着するように並べ、フィルム状の外部導体４をその２本の同軸線３を縦添えして包むように設けた。用いた外部導体４として、厚さ０．００４ｍｍのＰＥＴ樹脂基材の一方の面に接着剤層を介して厚さ０．００８ｍｍの銅箔が設けられた、幅２．５ｍｍで合計厚さ０．０２ｍｍの金属樹脂テープ４を用いた。この金属樹脂テープ４を銅箔側が同軸線側になるようにして、図３に示すように１．４ｍｍの幅だけ重なり部分８となるようにして縦添えした。この重なり部分８は、図３を平面視した場合の上下方向の空間部９を渡る長さで、その空間部９を覆うように配置し、その後に図４に示す凹部形成部材２０（滑車）を片側だけ使用し、凹み量Ｌが０．０１３６ｍｍの凹部７を片側だけ形成した（図２（Ｂ）参照）。なお、凹み量Ｌ／同軸線外径Ｄは、０．０１であった。 The two coaxial wires 3 produced were arranged so as to be in close contact with each other, and the film-shaped outer conductor 4 was provided so as to vertically attach and wrap the two coaxial wires 3. As the outer conductor 4 used, a copper foil having a thickness of 0.008 mm was provided on one surface of a PET resin base material having a thickness of 0.004 mm via an adhesive layer, and the width was 2.5 mm and the total thickness was 0. A 0.02 mm metal resin tape 4 was used. The metal resin tape 4 was vertically attached so that the copper foil side was on the coaxial line side and the overlapping portion 8 was formed by a width of 1.4 mm as shown in FIG. The overlapping portion 8 has a length that crosses the space portion 9 in the vertical direction when FIG. 3 is viewed in a plan view, is arranged so as to cover the space portion 9, and then the recess forming member 20 (pulley) shown in FIG. Was used on only one side, and a recess 7 having a recess amount L of 0.0136 mm was formed on only one side (see FIG. 2B). The dent amount L / coaxial line outer diameter D was 0.01.
　凹部７を形成した後に、編組シールドをカバー導体５として全体を覆うように設けた。編組シールド構造のカバー導体５は、外径０．１０ｍｍの銀めっき軟銅線を８０本用いた。その後、外被体６として、ＰＦＡ樹脂（デュポン社製）層を押出して形成し、外径は厚さ２．７ｍｍで幅４．０ｍｍの２芯平行ケーブル１０を作製した。 After forming the recess 7, a braided shield was provided as a cover conductor 5 so as to cover the whole. For the cover conductor 5 having a braided shield structure, 80 silver-plated annealed copper wires having an outer diameter of 0.10 mm were used. Then, as the outer cover 6, a PFA resin (manufactured by DuPont) layer was extruded to form a 2-core parallel cable 10 having an outer diameter of 2.7 mm and a width of 4.0 mm.
　［実施例２～１０］
　凹み量を種々変えた２芯平行ケーブルを作製した。それ以外は実施例１と同様にした。 [Examples 2 to 10]
A 2-core parallel cable with various dents was produced. Other than that, it was the same as in Example 1.
　［実施例１１］
　実施例１において、図４に示す凹部形成部材２０（滑車）を両側使用し、凹み量Ｌが０．０１３６ｍｍの凹部７を上下両側形成した（図２（Ａ）参照）。それ以外は実施例１と同様にした。なお、凹み量Ｌ／同軸線外径Ｄは、０．０１であった。 [Example 11]
In Example 1, the recess forming member 20 (pulley) shown in FIG. 4 was used on both sides to form recesses 7 having a recess amount L of 0.0136 mm on both the upper and lower sides (see FIG. 2A). Other than that, it was the same as in Example 1. The dent amount L / coaxial line outer diameter D was 0.01.
　［実施例１２～２０］
　凹み量を種々変えた２芯平行ケーブルを作製した。それ以外は実施例１１と同様にした。 [Examples 12 to 20]
A 2-core parallel cable with various dents was produced. Other than that, it was the same as in Example 11.
　［比較例１，２］
　比較例１と比較例２は、凹部７を設けない例であり、それ以外はそれぞれ実施例１，１１と同様とした。 [Comparative Examples 1 and 2]
Comparative Example 1 and Comparative Example 2 are examples in which the recess 7 is not provided, and other than that, the same as in Examples 1 and 11, respectively.
　［評価］
　伝送損失の測定結果を表１及び表２に示した。伝送損失は、ネットワークアナライザを用いてケーブル１ｍの減衰量を測定した。表１及び表２には、同軸線外径Ｄ、凹み量Ｌ、凹み量から算出した単位長体積、凹み量Ｌ／同軸線外径Ｄも併せて記載した。 [evaluation]
The measurement results of the transmission loss are shown in Tables 1 and 2. For the transmission loss, the attenuation of 1 m of the cable was measured using a network analyzer. Tables 1 and 2 also show the coaxial line outer diameter D, the dent amount L, the unit length volume calculated from the dent amount, and the dent amount L / coaxial line outer diameter D.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000002
　１　中心導体
　２　絶縁体
　２Ａ　空隙部
　２Ｂ　内環状部
　２Ｃ　外環状部
　２Ｄ　連結部
　３　同軸線
　４　フィルム状の外部導体（金属樹脂テープ）
　５　カバー導体（編組シールド又は横巻シールド）
　６　外被体
　７　凹部
　８　重なり部分
　９　空間部
　１０　２芯平行ケーブル
　２０　凹部形成治具（滑車等）
　Ｄ　同軸線の外径
　Ｌ　凹部の凹み量
　Ｐ１，Ｐ２　２つの同軸線と接した外部導体の各々の最上点
　Ｐ３　凹部の最下部となる底点
  1 Center conductor 2 Insulator 2A Air gap 2B Inner annular part 2C Outer annular part 2D Connecting part 3 Coaxial line 4 Film-shaped outer conductor (metal resin tape)
5 Cover conductor (braided shield or horizontal winding shield)
6 Outer body 7 Recessed part 8 Overlapping part 9 Space part 10 2-core parallel cable 20 Recessed part forming jig (pulley, etc.)
D Outer diameter of coaxial wire L Recessed amount of recess P1, P2 Top point of each of the outer conductors in contact with two coaxial wires P3 Bottom point at the bottom of the recess

Claims (9)

  1. 　複数の同軸線が一方向に並設された多芯平行ケーブルであって、前記複数の同軸線の外周にはフィルム状の外部導体が設けられ、前記フィルム状の外部導体は、並設された前記同軸線間で、少なくともその一部が前記同軸線の外周に沿う凹部を有する、ことを特徴とする多芯平行ケーブル。 A multi-core parallel cable in which a plurality of coaxial wires are arranged side by side in one direction, a film-shaped outer conductor is provided on the outer periphery of the plurality of coaxial lines, and the film-shaped outer conductors are arranged side by side. A multi-core parallel cable characterized in that at least a part thereof has a recess along the outer periphery of the coaxial line between the coaxial lines.
  2. 　前記凹部の凹み量をＬとし、前記同軸線の外径をＤとしたとき、Ｌ／Ｄが０．０１～０．４５の範囲内である、請求項１に記載の多芯平行ケーブル。 The multi-core parallel cable according to claim 1, wherein the L / D is in the range of 0.01 to 0.45 when the amount of the recess of the recess is L and the outer diameter of the coaxial line is D.
  3. 　前記フィルム状の外部導体は、前記複数の同軸線に縦添えで巻き付けられており、前記凹部は、前記フィルム状の外部導体が重なり部分に形成されている、請求項１又は２に記載の多芯平行ケーブル。 The multiple according to claim 1 or 2, wherein the film-shaped outer conductor is vertically wound around the plurality of coaxial wires, and the recess is formed in an overlapping portion of the film-shaped outer conductor. Core parallel cable.
  4. 　隣り合う前記同軸線間において、前記凹部は前記一方向に直行する方向に２か所形成されている、請求項１～３のいずれか１項に記載の多芯平行ケーブル。 The multi-core parallel cable according to any one of claims 1 to 3, wherein the recesses are formed in two places in a direction orthogonal to the one direction between the adjacent coaxial lines.
  5. 　前記フィルム状の外部導体を覆うカバー導体をさらに有する、請求項１～４のいずれか１項に記載の多芯平行ケーブル。 The multi-core parallel cable according to any one of claims 1 to 4, further comprising a cover conductor that covers the film-shaped outer conductor.
  6. 　前記同軸線が、中心導体と、該中心導体の外周に設けられた絶縁体とで構成されている、請求項１～５のいずれか１項に記載の多芯平行ケーブル。 The multi-core parallel cable according to any one of claims 1 to 5, wherein the coaxial line is composed of a central conductor and an insulator provided on the outer periphery of the central conductor.
  7. 　複数の同軸線が一方向に並設された多芯平行ケーブルの製造方法であって、前記複数の同軸線を一方向に並設する工程と、並設した前記同軸線をフィルム状の外部導体を縦添えして覆う工程と、縦添えした前記フィルム状の外部導体のうち前記同軸線間に位置する部分に凹部を形成する工程と、前記凹部を設けた後に前記フィルム状の外部導体を覆うカバー導体を設ける工程とを少なくとも有する、ことを特徴とする多芯平行ケーブルの製造方法。 This is a method for manufacturing a multi-core parallel cable in which a plurality of coaxial wires are arranged side by side in one direction. A step of vertically attaching and covering, a step of forming a recess in a portion of the vertically attached film-shaped outer conductor located between the coaxial lines, and a step of covering the film-shaped outer conductor after providing the recess. A method for manufacturing a multi-core parallel cable, which comprises at least a step of providing a cover conductor.
  8. 　前記凹部を形成する工程において、前記凹部を、前記一方向に直行する方向の２か所に形成する、請求項７に記載の多芯平行ケーブルの製造方法。 The method for manufacturing a multi-core parallel cable according to claim 7, wherein in the step of forming the concave portion, the concave portion is formed at two locations in a direction orthogonal to the one direction.
  9. 　前記凹部を形成する工程において、前記同軸線間に位置する前記フィルム状の外部導体を治具で押し込んで前記凹部を形成する、請求項７又は８に記載の多芯平行ケーブルの製造方法。 The method for manufacturing a multi-core parallel cable according to claim 7 or 8, wherein in the step of forming the recess, the film-shaped outer conductor located between the coaxial lines is pushed in with a jig to form the recess.
PCT/JP2021/039938 2020-12-14 2021-10-29 Multicore parallel cable and method for manufacturing same WO2022130801A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5493179U (en) * 1977-12-15 1979-07-02
JPS55131017U (en) * 1979-03-10 1980-09-17
JP2003031045A (en) * 2001-07-18 2003-01-31 Hitachi Cable Ltd Double-core parallel extra-fine coaxial cable with longitudinally attached deposited tape

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003031046A (en) 2001-07-18 2003-01-31 Hitachi Cable Ltd Two-core parallel extra-file coaxial cable with longitudinally added deposited tape
JP4685744B2 (en) 2006-10-19 2011-05-18 東京特殊電線株式会社 High-speed differential transmission cable

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5493179U (en) * 1977-12-15 1979-07-02
JPS55131017U (en) * 1979-03-10 1980-09-17
JP2003031045A (en) * 2001-07-18 2003-01-31 Hitachi Cable Ltd Double-core parallel extra-fine coaxial cable with longitudinally attached deposited tape

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