JP2016110730A - Multicore cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multicore cable comprising a plurality of coaxial electrical lines and insulation wires assembled and covered with coat, in which increment in cable diameter is suppressed to improve flexibility and handleability.SOLUTION: A multicore cable 1 comprises a plurality of electrical lines comprising coaxial electrical lines 2 and insulation wires and coat 6 covering periphery of the plurality of electrical lines. The plurality of electrical lines are aligned on 2 or more parallel lines. A pair of coaxial electrical lines in the electrical lines aligned in parallel are closely arranged. The coat 6 has a configuration in which 4 corner parts of a rectangular shape are rounded in a section orthogonal to longitudinal direction of the multicore cable 1. The insulation wires to be a grand line 4 are arranged at the side of inner surface of 4 corner parts of the coat 6. Center conductor of the coaxial electrical line 2 has 0.004 mmto 0.05 mmof sectional area. The coat 6 has thickness of 0.4 mm to 1.0 mm.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a multicore cable, and more particularly, to a multicore cable in which a plurality of coaxial cables and other insulated wires are assembled and the outside is covered with a jacket.

  A multi-core cable is known in which a plurality of coaxial electric wires that transmit high-speed digital signals and the like are assembled and the outer sides thereof are covered with a jacket. Some of these multicore cables are configured as composite cables including other insulated wires, for example, insulated wires for power supplies and insulated wires for control signals, in addition to coaxial wires.

  For example, Patent Document 1 includes a twisted signal line, a plurality of signal line pairs, and a power line pair, and the twisted signal line, the plurality of signal line pairs, and the power line pair are perpendicular to the longitudinal direction thereof. A transmission cable is disclosed that is bundled so that a plurality of signal line pairs and a power supply line pair surround a twisted signal line when viewed in a simple cross section.

  Patent Document 2 discloses an aggregate cable including an aggregate cable core having a plurality of flat cables, an electromagnetic shield part provided on the outer periphery of the aggregate cable core, and a jacket layer provided on the outer periphery of the electromagnetic shield part. Has been. Each flat cable includes a flat cable core in which a plurality of coaxial cables are arranged substantially in a line, and a sheath layer that is formed by covering substantially the entire surface of the flat cable core with a synthetic resin and restrains the plurality of coaxial cables. Have.

International Publication No. 2010/092812 JP 2010-97773 A

In a multi-core cable in which a plurality of coaxial wires and insulated wires are gathered to cover a jacket, there is a demand to make the cable diameter as small as possible and to reduce the cable thickness. In addition, in a multicore cable, the flexibility of the cable is required to improve handling.
However, when a plurality of electric wires are assembled with a round cross section, the cable diameter increases and becomes thicker as the number of electric wires included in the multicore cable increases, and the flexibility also decreases, resulting in poor handling.

  In addition, if the STP (Shielded twist pair) cable, which is a shielded twisted pair wire, or a 2-core parallel wire wound with shielding tape is used as the electric wire of the multicore cable, The flexibility of the multi-core cable is hindered by the integrated electric wire.

  In the cable of Patent Document 1, a cable having a circular cross section is formed when the double-wired electric wires are assembled, so that the diameter increases, and handling and flexibility are hindered. Patent Document 2 does not suggest a configuration including more electric wires.

  The present invention has been made in view of the above-described circumstances, and in a multi-core cable in which a plurality of coaxial wires and insulated wires are collected and covered with an outer sheath, an increase in cable diameter is suppressed, and flexibility and handleability are improved. The purpose is to provide a multi-core cable.

A multi-core cable according to the present invention is a multi-core cable having a plurality of wires including coaxial wires and insulated wires, and an outer sheath covering the periphery of the plurality of wires, wherein the plurality of wires are arranged in parallel in two or more rows. In the cross-section perpendicular to the longitudinal direction of the multi-core cable, the outer cover is rounded at four corners of the rectangle, in which a pair of coaxial electric wires are closely arranged among the paralleled electric wires. shaped, insulated wire becomes the ground lines are arranged on the inner surface of the envelope of the four corners, the cross-sectional area of the center conductor of the coaxial cable is 0.004mm ² ~0.05mm ^2, wherein This is a multi-core cable having a jacket thickness of 0.4 mm to 1.0 mm.

  According to the present invention, in a multicore cable in which a plurality of coaxial electric wires and insulated wires are assembled and covered with a jacket, an increase in the cable diameter is suppressed, and a multicore cable with improved flexibility and handleability is provided. Can do.

It is a figure which shows the structural example of the multi-core cable by this invention. It is a figure explaining the structure of the coaxial wire pair applied to a multicore cable.

First, embodiments of the present invention will be listed and described.
The invention related to the multi-core cable of the present application is a multi-core cable having a plurality of electric wires including coaxial wires and insulated wires, and a jacket covering the periphery of the plurality of electric wires, wherein the plurality of electric wires are two or more rows. A pair of coaxial wires are arranged in close contact with each other, and in the cross section perpendicular to the longitudinal direction of the multi-core cable, the jacket is rounded at four corners of a rectangle. has been shape, insulated wire becomes the ground lines are arranged on the inner surface of the envelope of the four corners, the cross-sectional area of the center conductor of the coaxial cable is located at 0.004mm ² ~0.05mm ² The multi-core cable has a thickness of the jacket of 0.4 mm to 1.0 mm. Thereby, the increase in a cable diameter and the deterioration of a softness | flexibility can be suppressed, and the multicore cable which improves handleability can be provided.

  Preferably, the plurality of electric wires are arranged in two rows, and all the electric wires are in contact with the inner surface of the jacket. Thereby, arrangement | positioning of the electric wire in a multicore cable can be stabilized.

  In one row of the plurality of electric wires arranged in parallel, from one corner portion to another corner portion, each electric wire is in contact with the inner surface of the outer jacket, and adjacent electric wires are arranged in contact with each other. It is preferable. Thereby, it is possible to stabilize the arrangement of the electric wires and suppress an increase in the cable width.

  Of the plurality of electric wires arranged in parallel, one row of electric wires preferably has a portion where the electric wires are not in contact with each other. When a plurality of electric wire rows cannot have the same width, the width of the electric wire row can be adjusted at a portion where the electric wires are not in contact with each other.

  It is preferable that intervening fibers are filled in portions where the electric wires are not in contact with each other. Thereby, it can stabilize so that the arrangement | sequence of an electric wire may not be disturbed.

  It is preferable that a plurality of coaxial electric wire pairs are arranged in each of two or more rows in which the electric wires are arranged in parallel, and the coaxial electric wire pairs in one row do not contact each other. Thereby, disorder of the arrangement | sequence when collecting an electric wire can be suppressed.

[Details of the embodiment of the present invention]
Specific examples of the multicore cable according to the present invention will be described below with reference to the drawings. In addition, this invention is not limited to these illustrations, is shown by the claim, and includes all the changes within the meaning and range equivalent to a claim.

FIG. 1 is a diagram showing a configuration example of a multicore cable according to the present invention. In the figure, 1 is a multi-core cable, 2 is a coaxial wire, 3 is a coaxial wire pair, 4 is a ground wire, 5 is another insulated wire, and 6 is a jacket (sheath).
The multi-core cable 1 is configured by covering a plurality of electric wires (coaxial wire pair 3, ground wire 4, and other insulated wires 5) including a coaxial wire and an insulated wire with an outer sheath 6. The other insulated wires 5 can include, for example, a low-speed signal transmission wire, a low-speed control signal wire, a power line, and the like.

  The jacket 6 is coated and formed by extrusion molding using a resin such as polyethylene (PE), polyvinyl chloride (PVC), ethylene vinyl acetate copolymer (EVA), polyurethane, and the thickness is 0.4 mm to 1 mm. The range is 0.0 mm. In order to maintain a shape in which a plurality of electric wires are arranged in parallel, the jacket 6 needs to have a certain strength, and also needs a thickness of more than a certain thickness from the viewpoint of durability. For this reason, the thickness of the jacket 6 is required to be 0.4 mm or more. Moreover, since the softness | flexibility falls and it becomes difficult to handle when the thickness exceeds 1.0 mm, it is preferable that the upper limit of the thickness is 1 mm.

  The coaxial wire pair 3 is formed by closely arranging two coaxial wires 2 in which a central conductor is covered with an insulator in parallel. In this example, five coaxial wire pairs 3 are assembled, but the number of sets is not limited. The coaxial wire pair 3 can simultaneously input a signal whose phase is inverted by 180 ° to the two coaxial wires 2 and transmit it, and synthesize the difference on the receiving side to double the signal output on the receiving side. . Further, since the noise signal received in the middle of the transmission path from transmission to reception is equally applied to the pair of coaxial cables 2, it is canceled when output as a differential signal on the receiving side, and noise is removed. . By arranging the coaxial wire pairs 3 in parallel and in close contact, the two coaxial wires 2 constituting the coaxial wire pair 3 are arranged in close contact in parallel, thereby causing a signal delay time difference (skew) between the two coaxial wires. ) Can be reduced. In addition, the configuration in which the coaxial cable 2 is arranged in parallel and the shield tape is not wound further provides flexibility compared to the STP cable that is a shielded pair-twisted wire or the two-core parallel wire wound with the shield tape. can do.

FIG. 2 is a diagram illustrating the configuration of a coaxial wire pair applied to a multicore cable. Each coaxial cable 2 has a configuration in which the center conductor 11 is covered with an insulator 12, the outer conductor 13 is disposed on the outer periphery of the insulator 12, and the outer side thereof is covered with a jacket 14. For example, a tin-plated mild steel wire or a tin-plated copper alloy wire is used as the center conductor 11, and a plurality of strands twisted or a single wire configuration is used. The center conductor 11 in each case, the cross-sectional area (area of the cross section perpendicular to the longitudinal direction) is ^{0.004mm 2 ~0.06mm 2, AWG (American} Wire Gauge) and an outer diameter of 30 to 40 equivalent To do. Thereby, a thin multi-core cable suitable for high-speed digital signal transmission between information processing apparatuses is obtained.

  As the insulator 12, a fluororesin such as FEP (tetrafluoroethylene-hexafluoropropylene copolymer) or PFA (tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer) can be used. A highly heat-resistant fluororesin is used. As the fluorinated fluororesin, a fluororesin having a terminal group fluorinated (—CF 3) can be used, but a completely fluorinated fluororesin may be used. Fluororesin has good thin-wall processability and is suitable for reducing the cable diameter. In addition, since the fluorinated resin has a low dynamic friction coefficient, it has good bending resistance.

The outer conductor 13 is formed by horizontally winding or braiding a wire made of, for example, a tin-plated mild steel wire or the like, and may have a structure in which a metal foil is additionally provided in order to improve a shielding function. ) It is formed by winding a resin tape such as a tape. Further, a resin material such as a fluororesin may be extrusion coated.

  In the above configuration, the multi-core cable 1 according to the embodiment of the present invention includes a plurality of electric wires including the coaxial electric wire 2 and the insulated wires (the ground wire 4 and the other insulated wires 5), and an outer covering the periphery of the plurality of electric wires. A plurality of electric wires are arranged in parallel in two or more rows. In the configuration of FIG. 1, a plurality of electric wires are arranged in two rows of the upper and lower rows, but may be arranged in parallel in three or more rows. By arranging a plurality of electric wires in parallel in a plurality of rows, the outer shape of the multi-core cable 1 can be flattened, the thickness thereof can be reduced, and the cable width can be appropriately increased. In this case, the width of the multi-core cable 1 (the length in the parallel direction of the wires) increases according to the number of wires to be assembled and the diameter thereof, but the width of the multi-core cable 1 connects the multi-core cable 1. Any width that is narrower than the connector width is acceptable. For example, the width of the multi-core cable 1 can be 3 mm or more and 10 mm or less. The thickness of the multicore cable can be, for example, 1.3 mm or more and 3.8 mm.

The cross section (FIG. 1) orthogonal to the longitudinal direction of the multicore cable 1 has a shape in which corners C1 to C4 at four corners of a rectangle are rounded. That is, an R shape is given to the outer periphery of the four corners of the rectangle. Here, the multi-core cable 1 has a rectangular cross section so as not to increase its thickness, and the outer peripheral surfaces of the four corners C1 to C4 of the rectangle are rounded to smooth the outer peripheral surface of the corners. ing. An insulated wire serving as the ground wire 4 is disposed on the inner surface side of each of the four corners C1 to C4 of the jacket 6. Providing the ground wires 4 at the four corners improves the symmetry of the multi-core cable, which is preferable for stabilizing the ground potential of the cable.
The inner surface of the jacket 6 is rounded along the shape of the ground wire 4, and the outer peripheral side corners of the jacket 6 are rounded so as to correspond to the shape. Thereby, the outer jacket 6 has a uniform thickness and imparts uniform flexibility.

All of the electric wires (coaxial electric wire 2, ground wire 4, and other insulated electric wires 5) arranged in parallel in a plurality of rows are in contact with the inner surface of the jacket 5. Thereby, arrangement | positioning of an electric wire is stabilized.
A plurality of electric wires arranged in parallel in a plurality of rows do not necessarily have the same width (length in the parallel direction). In this case, the width of the longest row matches the width of the inner surface of the jacket 6. That is, in any one row of the plurality of electric wires arranged in parallel, from one corner of the rectangular shape to the other corner, each wire touches the inner surface of the jacket 6 and each row of the wires is It arrange | positions so that it may mutually contact. In the example of FIG. 1, among the electric wires arranged in the upper and lower two rows, the upper electric wires are in contact with the inner surface of the jacket 6 until all the electric wires in the row reach the corner portion C2 from the corner portion C1. It arrange | positions so that each adjacent electric wire may mutually contact | connect. Thereby, the arrangement of the electric wires can be stabilized and the increase in the cable width can be suppressed.

Moreover, in any one row of the plurality of electric wires arranged in parallel, there is a portion where the electric wires are not in contact with each other. In the example of FIG. 1, among the wires arranged in the upper and lower rows, the lower wire has a gap G in the arrangement direction. In the portion other than the gap G, the lower wires are arranged adjacent to each other to stabilize the arrangement between the wires.
The gap G can be filled with intervening fibers (not shown). As the intervening fiber, for example, a fiber made of sufu (span rayon), a PP (polypropylene) fiber, or the like can be used. By filling the gap G between the electric wires with intervening fibers, the arrangement of the electric wires can be stabilized so as not to be disturbed.

The plurality of electric wires arranged in parallel are configured such that a plurality of coaxial electric wire pairs 3 are arranged in each of two or more rows in which the electric wires are arranged in parallel, and the coaxial electric wire pairs 3 in one row are not adjacent to each other. Yes. In the example of FIG. 1, among the electric wires arranged in two upper and lower rows, the upper electric wire includes three pairs of coaxial electric wires 3, and these three pairs of coaxial electric wires are included in the upper row. Are not adjacent to each other. Similarly, the lower wire includes two pairs of coaxial wires 3, but these two pairs of coaxial wires are not adjacent to each other in the lower row.
The coaxial wire 2 tends to have a larger diameter than other insulated wires. Therefore, in order to improve the symmetry of the arrangement of the electric wires in the multicore cable 1, it is preferable to arrange the coaxial electric wire pairs 3 so as not to be adjacent to each other in the row without concentrating the coaxial electric wire pairs 3. . This also suppresses the disturbance of the arrangement when assembling the electric wires.

  With the above configuration, in a multicore cable in which a plurality of coaxial wires and insulated wires are assembled and covered with a jacket, it is possible to provide a multicore cable with improved flexibility and handleability while suppressing an increase in cable diameter. it can.

DESCRIPTION OF SYMBOLS 1 ... Multi-core cable, 2 ... Coaxial electric wire, 3 ... Coaxial electric wire pair, 4 ... Ground wire, 5 ... Insulated electric wire, 11 ... Center conductor, 12 ... Insulator, 13 ... External conductor, 14 ... Jacket | cover.

Claims (6)

A multi-core cable having a plurality of wires including coaxial wires and insulated wires, and a jacket covering the periphery of the plurality of wires,
Two or more rows of the plurality of electric wires are juxtaposed, and a pair of coaxial electric wires among the juxtaposed electric wires are juxtaposed and arranged closely,
In the cross section orthogonal to the longitudinal direction of the multi-core cable, the jacket has a shape in which four corners of a rectangle are rounded, and an insulation that serves as a ground wire on the inner surface side of the four corners of the jacket The wires are placed,
The multi-core cable, wherein a cross-sectional area of a central conductor of the coaxial cable is 0.004 mm ^{2 to} 0.05 mm ² , and a thickness of the jacket is 0.4 mm to 1.0 mm.   The multi-core cable according to claim 1, wherein the plurality of electric wires are arranged in two rows, and all the electric wires are in contact with an inner surface of the jacket.   In one row of the plurality of electric wires arranged in parallel, from one corner portion to another corner portion, each electric wire is in contact with the inner surface of the outer jacket, and adjacent electric wires are arranged in contact with each other. The multi-core cable according to claim 2.   The multi-core cable according to claim 2, wherein a part of the plurality of electric wires arranged in parallel has a portion where the electric wires do not contact each other in one row of electric wires.   The multi-core cable according to claim 4, wherein intervening fibers are filled in portions where the electric wires are not in contact with each other. The multi-core cable according to any one of claims 1 to 5, wherein a plurality of coaxial electric wire pairs are arranged in each of two or more rows in which the electric wires are arranged in parallel, and the coaxial electric wire pairs in one row do not contact each other. .

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