CN119028639A - Multi-core cable - Google Patents
Multi-core cable Download PDFInfo
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- CN119028639A CN119028639A CN202311625387.5A CN202311625387A CN119028639A CN 119028639 A CN119028639 A CN 119028639A CN 202311625387 A CN202311625387 A CN 202311625387A CN 119028639 A CN119028639 A CN 119028639A
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- coaxial cables
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/04—Flexible cables, conductors, or cords, e.g. trailing cables
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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
- H01B11/20—Cables having a multiplicity of coaxial lines
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/04—Flexible cables, conductors, or cords, e.g. trailing cables
- H01B7/041—Flexible cables, conductors, or cords, e.g. trailing cables attached to mobile objects, e.g. portable tools, elevators, mining equipment, hoisting cables
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- Communication Cables (AREA)
- Insulated Conductors (AREA)
Abstract
本发明提供一种多芯电缆，其能够实现细径化，并且具有高弯曲性。多芯电缆(2)中，电接地的接地线(2)和多根同轴电缆(3)容纳于管状的护套(6)。同轴电缆(3)具有内部导体(31)、覆盖内部导体(31)的周围的绝缘体(32)以及外部导体(33)，该外部导体(33)由在绝缘体(32)的周围呈螺旋状地横向卷绕的多根外部导体裸线(330)构成，外部导体(33)露出，多根同轴电缆(3)各自的外部导体(33)通过与接地线(2)接触而直接地电接地或通过与其他同轴电缆(3)的外部导体(33)接触而间接地电接地。
The present invention provides a multi-core cable which can be reduced in diameter and has high flexibility. In the multi-core cable (2), an electrically grounded ground wire (2) and a plurality of coaxial cables (3) are contained in a tubular sheath (6). The coaxial cable (3) has an inner conductor (31), an insulator (32) covering the periphery of the inner conductor (31), and an outer conductor (33), wherein the outer conductor (33) is composed of a plurality of outer conductor bare wires (330) wound laterally in a spiral shape around the insulator (32), and the outer conductor (33) is exposed. The outer conductors (33) of the plurality of coaxial cables (3) are directly electrically grounded by contacting the ground wire (2) or indirectly electrically grounded by contacting the outer conductors (33) of other coaxial cables (3).
Description
Technical Field
The present invention relates to a multi-core cable having a plurality of coaxial cables.
Background
Conventionally, a multi-core cable having a plurality of coaxial cables is used for communication, for example. The multi-core communication cable described in patent document 1 includes a core material that is a fiber yarn made up of a plurality of fibers or a fiber bundle obtained by bundling the fiber yarn, a plurality of coaxial wires arranged on the outer periphery of the core material, a pressure-sensitive tape that covers and bundles the plurality of coaxial wires, a shield layer that covers the pressure-sensitive tape, and a tubular sheath that covers the shield layer. The coaxial cable includes a center conductor, an insulator, an outer conductor formed by winding a plurality of metal thin wires in a spiral shape in a lateral direction, and a covering body formed by winding a fusion layer of a resin tape with a fusion layer in a lateral direction on the outer conductor side.
Prior art literature
Patent literature
Patent document 1: japanese patent laid-open No. 2020-21733
Disclosure of Invention
Problems to be solved by the invention
For example, in-vivo cables of an articulated robot and multi-core cables used as cables for endoscopes and medical catheters are required to have high flexibility and a small diameter. The present invention has been made in order to meet such a demand, and an object thereof is to provide a multi-core cable which can be reduced in diameter and has high flexibility.
Means for solving the problems
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a multi-core cable in which at least 1 ground wire electrically grounded and a plurality of coaxial cables are accommodated in a tubular sheath, wherein the coaxial cables have an inner conductor, an insulator covering the periphery of the inner conductor, and an outer conductor composed of a plurality of bare outer conductor wires wound around the insulator in a spiral shape in a lateral direction, the outer conductor is exposed, and the outer conductors of the plurality of coaxial cables are electrically grounded directly by contact with the ground wire or indirectly by contact with the outer conductors of other coaxial cables.
Effects of the invention
According to the present invention, a multi-core cable having a reduced diameter and high flexibility can be provided.
Drawings
Fig. 1 is a cross-sectional view of a multi-core cable according to a first embodiment of the present invention.
In fig. 2, (a) is a perspective view showing 1 coaxial cable, (b) is a sectional view of line A-A of (a), and (c) is a sectional view of a ground wire shown on the same scale as (b).
Fig. 3 is an explanatory view of the ground wire and the plurality of coaxial cables, as viewed from a direction perpendicular to the longitudinal direction of the multi-core cable, with the tape member, the shield layer, and the sheath omitted.
In fig. 4, (a) is a schematic diagram showing a configuration example of a device system in which one end device and the other end device are connected by using a plurality of multicore cables, and (B) is a sectional view of the multicore cable at line B-B of (a).
Fig. 5 is a configuration diagram showing an example of a state in which the ground line of 1 multi-core cable and the inner conductors of a plurality of coaxial cables are connected to a plurality of electrodes of the substrate of the other end side device.
Fig. 6 is a cross-sectional view of a multicore cable according to a second embodiment of the present invention.
Fig. 7 is a diagram illustrating a band member, a shield layer, and a sheath of the multicore cable omitted in the second embodiment, and an explanatory diagram of the ground wire and the plurality of coaxial cables viewed from a direction perpendicular to the longitudinal direction of the multicore cable.
Fig. 8 is a cross-sectional view of a multicore cable according to modification 1 of the second embodiment.
Fig. 9 is a cross-sectional view of a multicore cable according to modification 2 of the second embodiment.
Fig. 10 is a cross-sectional view of a multicore cable according to a third embodiment of the present invention.
Description of the reference numerals
1. 1A, 1B, 1C, 1D … multicore cables, 2A, 2B, 2C, 2D grounding wires, 3A-3H coaxial cables, 6 … sheaths, 20, 20A, 20B, 20C, 20D … grounded bare wire, 31 … inner conductor, 32 … insulator, 33 … outer conductor, 130 … shielded bare wire, 310 … inner conductor bare wire, 330 … outer conductor bare wire.
Detailed Description
First embodiment
Fig. 1 is a cross-sectional view of a multi-core cable 1 according to a first embodiment of the present invention. In fig. 1, a cross section perpendicular to the longitudinal direction of the multi-core cable 1 is shown. The multi-core cable 1 is used as a cable for an endoscope or a medical catheter, or an in-vivo cable for an articulated robot, for example.
The multi-core cable 1 includes a ground wire 2 electrically grounded, a plurality of coaxial cables 3, a tape member 4 spirally wound around the ground wire 2 and the plurality of coaxial cables 3, a shield layer 5 composed of a plurality of shielded bare wires 50 spirally wound around the tape member 4 in a lateral direction, and a tubular sheath 6 covering the outer periphery of the shield layer 5.
In the present embodiment, 8 coaxial cables 3 are housed together with the ground wire 2 in the sheath 6. In the present embodiment, the multi-core cable 1 has 1 ground wire 2. The multi-core cable 1 may have a plurality of ground wires 2. That is, the multi-core cable 1 may have at least 1 ground wire 2. The ground wire 2 is a stranded wire formed by stranding a plurality of ground bare wires 20. The bare grounding wire 20 is, for example copper alloy wire or tin-plated copper alloy wire. In the present embodiment, 7 ground bare wires 20 are twisted to constitute the ground wire 2. The ground wire 2 is disposed in parallel with the sheath 6 near the center of the sheath 6.
As the belt member 4, for example, a member made of woven cloth, paper, resin, or the like can be used. The band member 4 is wound in a spiral shape in a state of being in contact with the coaxial cable 3. The bare shield wire 50 is made of, for example, silver-plated copper alloy, and is disposed between the tape member 4 and the sheath 6. The sheath 6 is made of, for example, an extrusion molded fluororesin, and protects the content thereof. The outer diameter of the sheath 6, that is, the outer diameter D 1 of the multi-core cable 1 is 1.0mm or less.
Fig. 2 (a) is a perspective view showing 1 coaxial cable 3. Fig. 2 (b) is a sectional view taken along line A-A of fig. 2 (a). Fig. 2 (c) is a sectional view of the ground wire 2 shown on the same scale as fig. 2 (b).
The coaxial cable 3 includes an inner conductor 31, an insulator 32 covering the periphery of the inner conductor 31, and an outer conductor 33 disposed around the insulator 32. The outer periphery of the outer conductor 33 of the coaxial cable 3 is exposed, and the outermost layer of the coaxial cable 3 is the outer conductor 33. That is, the coaxial cable 3 is an uncovered coaxial line in which the outer conductor 33 is exposed. The outer diameter D 3 of the coaxial cable 3 is 0.2mm or less.
The inner conductor 31 is a stranded wire formed by stranding a plurality of bare inner conductor wires 310. In the present embodiment, 7 bare inner conductor wires 310 are twisted to form the inner conductor 31. The inner conductor bare wire 310 is, for example copper alloy wire or tin-plated copper alloy wire. The outer diameter D 31 of the inner conductor 31 is 0.1mm or less. The outer diameter D 2 of the ground wire 2 is the same as or larger than the outer diameter D 31 of the inner conductor 31. For example, the outer diameter D 2 of the ground wire 2 is 1 to 2 times the outer diameter D 31 of the inner conductor 31. By setting the outer diameter D 2 of the ground wire 2 to be 1 to 2 times the outer diameter D 31 of the inner conductor 31, the outer diameter D 1 of the multi-core cable 1 can be reduced, and the outer conductors 33 of the plurality of coaxial cables 3 can be electrically grounded reliably.
The outer diameters of the multicore cable 1, the coaxial cable 3, the inner conductor 31, and the ground wire 2 can be measured by a method according to JIS C3005 using, for example, a vernier caliper, a micrometer, or a microscope. The outer diameters of the bare grounding wires 20A to 20D and the ground wires 2A to 2D in the second embodiment, the modification thereof, and the third embodiment, which will be described later, can be measured by the method according to JIS C3005.
The insulator 32 is made of, for example, a fluororesin. As the fluororesin for the insulator 32, more specifically, PFA (tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer) can be preferably used, for example. The inner conductor 31 is buried in the center portion of the insulator 32.
The outer conductor 33 is composed of a plurality of outer conductor bare wires 330 wound in a spiral shape in a lateral direction. The plurality of outer conductor bare wires 330 are spirally and laterally wound so as to be in contact with the outer peripheral surface 32a of the insulator 32. In the present embodiment, the outer conductor 33 is constituted by 30 outer conductor bare wires 330 as an example. The bare outer conductor 330 is, for example copper alloy wire or tin-plated copper alloy wire. In the present embodiment, the specifications of the plurality of coaxial cables 3 in the multi-core cable 1, such as the thickness and the material, are the same, but the present invention is not limited thereto, and the specifications of some of the coaxial cables 3 may be different from those of other coaxial cables 3.
The direction of transverse winding of the plurality of bare outer conductor wires 330 as viewed from the longitudinal direction of the coaxial cable 3 is the same as the direction of twisting of the plurality of bare inner conductor wires 310 of the inner conductor 31. In fig. 2 (b), the twisting direction of the bare inner conductor 310 is indicated by an arrow a 31, and the lateral winding direction of the bare outer conductor 330 is indicated by an arrow a 33. The twisting direction of the inner conductor bare wire 310 and the lateral winding direction of the outer conductor bare wire 330 are common to the respective coaxial cables 3. The direction of twisting the plurality of bare earth wires 20 in the ground wire 2 is the same as the direction of twisting the inner bare conductor 310 and the direction of transverse winding of the outer bare conductor 330. In fig. 2 (c), the twisting direction of the plurality of bare ground wires 20 is indicated by an arrow a 2.
The outer conductor 33 of each of the plurality of coaxial cables 3 is directly electrically grounded by contact with the ground wire 2 or is indirectly electrically grounded by contact with the outer conductor 33 of another coaxial cable 3. In order to explain the structure of the multi-core cable 1 in more detail, in the case where 8 coaxial cables 3 are specified, the respective coaxial cables 3 will be described as first to eighth coaxial cables 3A to 3H. The coaxial cable 3 is a generic term for the first to eighth coaxial cables 3A to 3H.
Fig. 3 is an explanatory view of the ground wire 2 and the first to eighth coaxial cables 3A to 3H, as viewed from a direction perpendicular to the longitudinal direction of the multi-core cable 1, with the tape member 4, the shield layer 5, and the sheath 6 omitted. In fig. 3, the ground line 2 and the first coaxial cable 3A are shown by solid lines, and the second to eighth coaxial cables 3B to 3H are schematically shown by virtual lines (two-dot chain lines).
The first coaxial cable 3A is disposed along the ground wire 2 near the center portion of the sheath 6. The outer conductor 33 of the first coaxial cable 3A is electrically grounded by direct contact with the ground wire 2. In the present embodiment, the ground wire 2 and the first coaxial cable 3A are arranged parallel to each other along the cable center axis C. But the ground wire 2 and the first coaxial cable 3A may be twisted in a spiral shape.
The second to eighth coaxial cables 3B to 3H are arranged in a spiral shape so as to surround the ground wire 2 and the first coaxial cable 3A. The direction of the spiral winding of the second to eighth coaxial cables 3B to 3H as viewed from the longitudinal direction of the multi-core cable 1 is the same as the direction of the twisting of the inner conductor bare wire 310 and the direction of the transverse winding of the outer conductor bare wire 330. In fig. 3, the direction of spiral winding of the second to eighth coaxial cables 3B to 3H is indicated by an arrow a 3.
In the cross section shown in fig. 1, the second to eighth coaxial cables 3B to 3H are arranged around the ground wire 2 and the first coaxial cable 3A along the circumferential direction of the multi-core cable 1 centered on the cable center axis C. The outer conductor 33 of each of the second to eighth coaxial cables 3B to 3H is in contact with the outer conductor 33 of the other coaxial cable 3 adjacent in the circumferential direction of the multi-core cable 1. In addition, the outer conductor 33 of the second coaxial cable 3B and the outer conductor 33 of the third coaxial cable 3C are in contact with the ground line 2. In addition, the outer conductor 33 of the sixth coaxial cable 3F and the outer conductor 33 of the seventh coaxial cable 3G are in contact with the outer conductor 33 of the first coaxial cable 3A.
As described above, in the present embodiment, in the section shown in fig. 1, the outer conductors 33 of the first to third coaxial cables 3A to 3C are directly electrically grounded by contact with the ground wire 2, and the outer conductors 33 of the fourth to eighth coaxial cables 3D to 3H are indirectly electrically grounded by contact with the outer conductors 33 of the other coaxial cables 3. However, since the second to eighth coaxial cables 3B to 3H are arranged in a spiral shape so as to surround the ground wire 2 and the first coaxial cable 3A as described above, the second to eighth coaxial cables 3B to 3H can be in direct contact with the ground wire 2 at other portions in the longitudinal direction of the multi-core cable 1.
Fig. 4 (a) is a schematic diagram showing a configuration example of the device system 7 in which the composite multi-core cable 10 configured by using the multi-core cable 1 of the multi-root embodiment is electrically connected to the one end device 71 connected to one end of the composite multi-core cable 10 and the other end device 72 connected to the other end of the composite multi-core cable 10. Fig. 4 (B) is a cross-sectional view of the composite multi-core cable 10 at line B-B of fig. 4 (a). The composite multi-core cable 10 is repeatedly bent at a plurality of portions in the longitudinal direction. The other end device 72 is, for example, a camera of an endoscope system inserted into a human body or a catheter head of a catheter system. The other end device 72 may be an articulated robot, an actuator of a machine tool, a sensor, or the like.
The one-end device 71 and the other-end device 72 have housing members 711 and 721 and substrates 712 and 722 accommodated in the housing members 711 and 721, respectively. The ground line 2 of each of the plurality of multicore cables 1 and the inner conductor 31 of the plurality of coaxial cables 3 are connected to electrodes provided on the substrates 712 and 722. The substrates 712 and 722 may be flexible substrates having a flexible film shape, for example, or may be solid substrates having higher rigidity than the flexible substrates. However, as the substrate 722 of the other-end device 72, a flexible substrate capable of realizing downsizing and weight saving of the other-end device 72 is preferably used.
Although not shown, both ends of the shielded bare wires 50 of the plurality of multicore cables 1 are electrically connected to the housing members 711 and 721 of the one-end device 71 and the other-end device 72. The case members 711 and 721 are made of metal, and electromagnetically shield the substrates 712 and 722.
As shown in fig. 4 (b), the composite multi-core cable 10 includes a plurality of multi-core cables 1, a plurality of power wires 11, a tape member 12 wound around the plurality of multi-core cables 1 and the plurality of power wires 11 in a spiral shape, a shield layer 13 composed of a plurality of shielded bare wires 130 wound around the tape member 12 in a spiral shape in a lateral direction, and a tubular outer sheath 14 covering the outer periphery of the shield layer 13. The plurality of multicore cables 1 and the plurality of power supply wires 11 are helically stranded. The power supply line 11 is a simple line having a conductor line 111 formed by twisting a plurality of bare wires 110 and an insulator 112 covering the conductor line 111. As an example, the conductor line 111 is connected to a power supply electrode provided on the back surface of the substrate 712 or 722 opposite to the surface on which the plurality of electrodes connecting the ground line 2 and the inner conductors 31 of the plurality of coaxial cables 3 are provided.
The inner conductor 31 in the plurality of coaxial cables 3 of each of the plurality of multicore cables 1 transmits an electric signal between the one-end side device 71 and the other-end side device 72. The outer conductor 33 functions as an electromagnetic shield. The power supply line 11 supplies electric power for the electric operation of the other-end device 72 to the other-end device 72. In the example shown in fig. 4 (b), the composite multi-core cable 10 has 7 multi-core cables 1 and 6 power supply lines 11. However, the number of the multi-core cables 1 and the power supply lines 11 in the composite multi-core cable 10 can be appropriately selected according to the purpose, function, and the like of the device system 7.
Fig. 5 is a configuration diagram showing an example of a state in which the ground wires 2 of 1 multi-core cable 1 and the inner conductors 31 of a plurality of coaxial cables 3 are connected to a plurality of electrodes 722a provided on a substrate 722 of the other end device 72. The connection between the substrate 712 of the one-end device 71 and the multi-core cable 1 is also performed in the same manner as in the configuration shown in fig. 5.
As shown in fig. 5, the insulator 32 of the coaxial cable 3 is removed in the vicinity of the electrode 722a, exposing the inner conductor 31. The ground line 2 and the inner conductor 31 are connected to the plurality of electrodes 722a by solder, for example. In fig. 5, illustration of the solder is omitted. The connection between the inner conductor 31 and the electrode 722a is not limited to soldering, and may be performed using a conductive adhesive or by welding.
The band member 4 is cut near the end face 6a of the sheath 6. The plurality of bare outer conductor wires 330 of the outer conductors 33 of the plurality of coaxial cables 3 are cut near the end face 4a of the band member 4. That is, both end portions of the outer conductor bare wire 330 become cut ends.
The shielded bare wires 50 of the multi-core cable 1 are led out from between the tape member 4 and the sheath 6, bundled, and electrically connected to the case member 721 by the solder 8. The plurality of shielded bare wires 50 may be crimped to the connection terminal by caulking, and the connection terminal may be connected to the case member 721 by, for example, bolting or caulking. Alternatively, the plurality of shielded bare wires 50 may be crimped to the crimped portion formed in the case member 721.
(Effects of the first embodiment)
According to the first embodiment described above, since the outer circumference of the outer conductor 33 of each coaxial cable 3 is not covered, the outer diameter of the coaxial cable 3 can be reduced, and the outer diameter of the multi-core cable 1 and the outer diameter of the composite multi-core cable 10 can be reduced. In addition, the outer conductor 33 of the coaxial cable 3 is not covered, and thus the flexibility of the multi-core cable 1 is also improved.
In the first embodiment, since the outer conductor 33 of each of the plurality of coaxial cables 3 is directly electrically grounded by contact with the ground wire 2 or indirectly electrically grounded by contact with the outer conductor 33 of another coaxial cable 3, the device structure can be simplified and the number of man-hours for operation can be reduced, as compared with the case where the outer conductor 33 is connected to the electrodes of the substrates 712 and 722 of the one-end device 71 and the other-end device 72 and grounded, for example.
In the first embodiment, at least 1 coaxial cable 3 (first coaxial cable 3A) is arranged along the ground line 2, and the other coaxial cables 3 (second to eighth coaxial cables 3B to 3H) are arranged in a spiral shape so as to surround at least 1 coaxial cable 3 (first coaxial cable 3A) and the ground line 2, so that the outer conductors 33 of all the coaxial cables 3 can be reliably electrically grounded. That is, if 7 or 8 coaxial cables 3 are arranged so as to surround 1 ground wire 2, the interval between the ground wires 2 and the coaxial cables 3 tends to be large, and connection between the ground wires 2 and the outer conductors 33 may not be performed with sufficient reliability, but in the first embodiment, the outer conductors 33 of the first coaxial cable 3A can be reliably brought into contact with the ground wires 2 by arranging the first coaxial cable 3A along the ground wires 2, and the second to eighth coaxial cables 3B to 3H can be reliably brought into contact with the outer conductors 33 of the ground wires 2 or the first coaxial cable 3A by arranging the second to eighth coaxial cables 3B to 3H in a spiral shape so as to surround the first coaxial cable 3A and the ground wires 2. That is, the outer conductors 33 of all the coaxial cables 3 can be reliably electrically grounded.
In the first embodiment, the direction of the spiral winding of the second to eighth coaxial cables 3B to 3H as seen from the longitudinal direction of the multi-core cable 1 is the same as the direction of the transverse winding of the outer conductor bare wire 330 in each coaxial cable 3 and the direction of the twisting of the plurality of ground bare wires 20 in the ground wire 2, and therefore, the contact between the outer conductor bare wires 330 in each coaxial cable 3 and the plurality of ground bare wires 20 are likely to be line contact along the longitudinal direction of these outer conductor bare wires 330 and ground bare wires 20, and the occurrence of disconnection in the outer conductor bare wires 330 and ground bare wires 20 can be suppressed even when the multi-core cable 1 is repeatedly bent.
Second embodiment
Next, a second embodiment of the present invention will be described with reference to fig. 6 and 7.
Fig. 6 is a cross-sectional view of a multicore cable 1A according to a second embodiment of the present invention. Like the multicore cable 1 of the first embodiment, the multicore cable 1A has a ground wire 2A electrically grounded, a plurality of coaxial cables 3, a tape member 4 spirally wound around the ground wire 2A and the plurality of coaxial cables 3, a shield layer 5 composed of a plurality of shielded bare wires 50 spirally wound around the tape member 4 in a lateral direction, and a tubular sheath 6 covering the outer periphery of the shield layer 5, but the arrangement of the ground wire 2A and the plurality of coaxial cables 3 is different from that of the multicore cable 1 of the first embodiment. The structure and materials of the respective members of the coaxial cable 3 are the same as those of the first embodiment.
The multi-core cable 1A of the present embodiment has a ground wire 2A arranged in the center portion, and a plurality of coaxial cables 3 are arranged so as to surround the ground wire 2A. The ground wire 2A is a stranded wire formed by stranding a plurality of ground bare wires 20A. In the example shown in fig. 6, 17 ground bare wires 20A are twisted to form a ground wire 2A, and 8 coaxial cables 3 are arranged between the ground wire 2A and the band member 4. In fig. 6, the twisting direction of the plurality of bare ground wires 20A is indicated by an arrow a 2A.
The outer diameter D 20A of each of the plurality of bare earth wires 20A in the earth wire 2A is the same as or larger than the outer diameter D 31 (see fig. 2 b) of the inner conductor 31. For example, the outer diameter D 20A of the ground bare wire 20A is1 to 2 times the outer diameter D 31 of the inner conductor 31. By setting the outer diameter D 20A of the ground bare wire 20A to 1 to 2 times the outer diameter D 31 of the inner conductor 31, the flexibility of the ground wire 2A can be improved, and the ground wire 2A can be reliably brought into contact with the outer conductor 33 of each of the plurality of coaxial cables 3. In the present embodiment, the outer diameter D 20A of the ground bare wire 20A formed is slightly larger than the outer diameter D 31 of the inner conductor 31.
Fig. 7 is an explanatory view of the ground wire 2A and 8 coaxial cables 3, as viewed from a direction perpendicular to the longitudinal direction of the multi-core cable 1A, with the tape member 4, the shield layer 5, and the sheath 6 omitted. In fig. 7, the ground line 2A is indicated by a solid line, and the plurality of coaxial cables 3 are schematically indicated by a virtual line (two-dot chain line).
The ground wire 2A is disposed so as to extend in the cable longitudinal direction in parallel with the cable center axis C. The plurality of coaxial cables 3 are arranged in a spiral shape so as to surround the ground wire 2A. The direction of the spiral winding of the plurality of coaxial cables 3 as viewed from the longitudinal direction of the multi-core cable 1 shown by the arrow a 3A in fig. 7 is the same as the direction of the twisting of the plurality of bare ground wires 20A shown by the arrow A2A in fig. 6. The outer diameter D 2A of the ground wire 2A is formed larger than the outer diameter D 3 of the coaxial cable 3 (see fig. 2B).
The outer conductors 33 of the 8 coaxial cables 3 are electrically grounded by direct contact with the ground wire 2A. However, the outer conductor 33 of some of the 8 coaxial cables 3 may be electrically grounded by contacting the outer conductor 33 of the other coaxial cable 3 which is electrically grounded, instead of contacting the ground wire 2A.
According to the second embodiment, the same effects as those of the first embodiment can be obtained. Further, since all of the 8 coaxial cables 3 are arranged in a spiral shape so as to face the ground wire 2A in the cable radial direction perpendicular to the cable center axis C, the outer conductor 33 of each coaxial cable 3 is brought into direct contact with the ground wire 2A, and is easily electrically grounded. Further, since the outer diameter D 2A of the ground wire 2A is larger than the outer diameter D 3 of the coaxial cable 3, the gap between the ground wire 2A and the outer conductor 33 of each coaxial cable 3 is small, and the ground wire 2A and the outer conductor 33 are easily brought into contact. The ground wire 2A may be formed of a double stranded wire formed by stranding a plurality of stranded wires formed by stranding a plurality of bare ground wires.
Modification 1 of the second embodiment
Fig. 8 is a cross-sectional view of a multicore cable 1B according to modification 1 of the second embodiment. In the second embodiment described above, the case where 17 ground bare wires 20A are twisted to form the ground wire 2A is described, but in modification 1 shown in fig. 8, 7 ground bare wires 20B are twisted to form the ground wire 2B. The outer diameter D 20B of the formed ground bare wire 20B is slightly smaller than 2 times the outer diameter D 31 of the inner conductor 31. Other structures of the multi-core cable 1B are the same as those of the second embodiment described above. According to modification 1, the same effects as those of the second embodiment can be obtained.
Modification 2 of the second embodiment
Fig. 9 is a cross-sectional view of a multicore cable 1C according to modification 2 of the second embodiment. In the second embodiment and modification 1 described above, the case where the multicore cables 1A, 1B have 8 coaxial cables 3 has been described, but in modification 2, the multicore cable 1C has 5 coaxial cables 3. The 5 coaxial cables 3 are arranged in a spiral shape so as to surround the ground wire 2C. The ground wire 2C is formed by twisting 7 ground bare wires 20C, and has an outer diameter corresponding to the space surrounded by 5 coaxial cables 3. The outer conductor 33 of each coaxial cable 3 is electrically grounded by direct contact with the ground wire 2C. The outer diameter D 2C of the formed ground wire 2C is larger than the outer diameter D 31 of the inner conductor 31 and smaller than the outer diameter D 3 of the coaxial cable 3.
According to modification 2, the same effects as those of the second embodiment can be obtained. If the number of coaxial cables 3 is 4 or less, the space surrounded by these coaxial cables 3 is narrowed, and the ground line disposed in the space is too thin, so that the resistance is increased, which is not preferable.
Third embodiment
Next, a third embodiment of the present invention will be described with reference to fig. 10.
Fig. 10 is a cross-sectional view of a multicore cable 1D according to a third embodiment of the present invention. Similar to the multicore cables 1 and 1A of the first and second embodiments, the multicore cable 1D includes an electrically grounded ground wire 2D, a plurality of coaxial cables 3, a tape member 4 spirally wound around the ground wire 2D and the plurality of coaxial cables 3, a shield layer 5 composed of a plurality of shielded bare wires 50 spirally wound around the tape member 4 in a lateral direction, and a tubular sheath 6 covering the outer periphery of the shield layer 5, but the arrangement of the ground wire 2D and the plurality of coaxial cables 3 is different from that of the multicore cables 1 and 1A of the first and second embodiments.
In the multicore cable 1D of the present embodiment, the ground wire 2D is disposed in the center portion, and a plurality of coaxial cables 3 are disposed between the ground wire 2D and the band member 4 so that the coaxial cables 3 are arranged along the cable radial direction. In the present embodiment, the multi-core cable 1D has 16 coaxial cables 3. The ground wire 2D is a twisted wire formed by twisting a plurality of ground bare wires 20D. In the example shown in fig. 10, 7 ground bare wires 20D are twisted to form a ground wire 2D. In fig. 10, the twisting direction of the plurality of bare ground wires 20D is indicated by an arrow a 2D.
5 Coaxial cables 3 out of the 16 coaxial cables 3 are arranged so as to surround the ground line 2D. The remaining 11 coaxial cables 3 are disposed so as to surround the outer circumferences of the 5 coaxial cables 3 (which surround the ground line 2D). The number of coaxial cables 3 surrounding the ground wire 2D is preferably at least 5 (5 or more) as in the modification 2 of the second embodiment. In the present embodiment, 5 coaxial cables 3 surrounding the ground line 2D are hereinafter referred to as inner-layer coaxial cables 3, and the other 11 coaxial cables 3 are hereinafter referred to as outer-layer coaxial cables 3.
The outer conductors 33 of the inner plurality of coaxial cables 3 are electrically grounded by direct contact with the ground wire 2A. The outer conductor 33 of each of the plurality of outer coaxial cables 3 is indirectly electrically grounded by contact with the outer conductor 33 of at least any one of the plurality of inner coaxial cables 3.
The plurality of coaxial cables 3 in the inner layer are arranged in a spiral around the ground wire 2D. The plurality of coaxial cables 3 of the outer layer are arranged in a spiral shape around the plurality of coaxial cables 3 of the inner layer. The direction of the spiral winding of the plurality of coaxial cables 3 of the inner layer and the direction of the spiral winding of the plurality of coaxial cables 3 of the outer layer are the same as the direction of the twisting of the plurality of bare ground wires 20A.
According to the third embodiment, the same effects as those of the first and second embodiments can be obtained, and more coaxial cables 3 than those of the first and second embodiments can be accommodated in the sheath 6, and the outer conductors 33 of the respective coaxial cables 3 can be electrically grounded.
(Summary of embodiments)
Next, reference numerals and the like in the cited embodiments describe technical ideas grasped from the above-described embodiments. However, the symbols in the following description are not limited to the members and the like that embody the constituent elements in the claims as embodiments.
[1] The multi-core cables 1, 1A, 1B, 1C, 1D are formed by housing at least 1 ground wire 2, 2A, 2B, 2C, 2D and a plurality of coaxial cables 3 electrically grounded in a tubular sheath 6, wherein the coaxial cables 3 have an inner conductor 31, an insulator 32 covering the periphery of the inner conductor 31, and an outer conductor 33, the outer conductor 33 is composed of a plurality of outer conductor bare wires 330 spirally and laterally wound around the insulator 32, the outer conductor 33 is exposed, and the outer conductors 33 of the plurality of coaxial cables 3 are electrically grounded directly by contact with the ground wires 2, 2A, 2B, 2C, 2D or indirectly by contact with the outer conductors 33 of the other coaxial cables 3.
[2] The multi-core cable 1 according to item [1], wherein at least 1 of the coaxial cables 3 is arranged along the ground line 2, and the other coaxial cables 3 are arranged in a spiral shape so as to surround the at least 1 coaxial cables 3 and the ground line 2.
[3] The multi-core cable 1A, 1B, 1C, 1D according to the above [1], wherein at least 5 of the coaxial cables 3 are arranged so as to surround the ground lines 2A, 2B, 2C, 2D.
[4] The multi-core cable 1A, 1B according to the above [3], wherein the ground wires 2A, 2B are formed by twisting a plurality of bare ground wires 20A, 20B, and the outer diameter of each of the plurality of bare ground wires 20A, 20B is 1 times or more and less than 2 times the outer diameter of the inner conductor 31.
[5] The multi-core cable 1D according to the above [3], wherein a plurality of the coaxial cables 3 are further arranged so as to surround the outer circumference of the at least 5 coaxial cables 3.
The first to third embodiments and modifications of the present invention have been described above, but these embodiments and modifications do not limit the invention according to the claims. Note that all combinations of the features described in the embodiments and the modifications are not limited to the means for solving the problems of the invention.
The present invention can be implemented by appropriately modifying the present invention within a range not departing from the gist thereof. For example, in the above-described embodiment and modification, the case where the ground wire is a stranded wire has been described, but the ground wire is not limited to this, and may be a single wire. The tape member 4 and the shielding layer 5 may be omitted depending on the environment in which the multi-core cable is used and the use conditions. In order to make the shape of the sheath 6 approximate to a circular shape, spacers may be disposed around the ground wires 2, 2A, 2B, 2C, 2D or the plurality of coaxial cables 3 to the extent that the electrical grounding of the outer conductor 33 of the coaxial cable 3 is not hindered. Further, conductive spacers may be disposed around the ground lines 2, 2A, 2B, 2C, 2D or the plurality of coaxial cables 3.
Claims (5)
1. A multi-core cable accommodates at least 1 ground wire and a plurality of coaxial cables electrically grounded in a tubular sheath, wherein,
The coaxial cable has an inner conductor, an insulator covering the circumference of the inner conductor, and an outer conductor,
The outer conductor is formed of a plurality of outer conductor bare wires spirally and laterally wound around the insulator, and the outer conductor is exposed,
The outer conductor of each of the plurality of coaxial cables is directly electrically grounded by contact with the ground wire or is indirectly electrically grounded by contact with the outer conductor of the other coaxial cable.
2. The multi-core cable according to claim 1, wherein at least 1 of the coaxial cables is arranged along the ground line, and the other coaxial cables are arranged in a spiral shape so as to surround the at least 1 of the coaxial cables and the ground line.
3. The multi-core cable according to claim 1, wherein at least 5 of the coaxial cables are arranged so as to surround the ground wire.
4. The multi-core cable according to claim 3, wherein the ground wire is formed by twisting a plurality of ground bare wires, and an outer diameter of the ground wire is 1 to 2 times an outer diameter of the inner conductor.
5. The multi-core cable according to claim 3, wherein a plurality of the coaxial cables are further arranged so as to surround an outer circumference of the at least 5 coaxial cables.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2023-086749 | 2023-05-26 | ||
| JP2023086749A JP2024169899A (en) | 2023-05-26 | 2023-05-26 | Multi-core cable |
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| Publication Number | Publication Date |
|---|---|
| CN119028639A true CN119028639A (en) | 2024-11-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311625387.5A Pending CN119028639A (en) | 2023-05-26 | 2023-11-30 | Multi-core cable |
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| Country | Link |
|---|---|
| JP (1) | JP2024169899A (en) |
| CN (1) | CN119028639A (en) |
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2023
- 2023-05-26 JP JP2023086749A patent/JP2024169899A/en active Pending
- 2023-11-30 CN CN202311625387.5A patent/CN119028639A/en active Pending
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| JP2024169899A (en) | 2024-12-06 |
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