JP2022049979A - Composite cable - Google Patents

Abstract

To provide a composite cable excellent in twisting properties.SOLUTION: A composite cable includes: a plurality of coaxial cables; and an outer peripheral coating arranged on an outer periphery of the plurality of coaxial cables. The plurality of coaxial cables include coaxial cables having different outer diameters. The plurality of coaxial cables are twisted along a longer direction thereof to form a composite wire. At least a first coaxial cable being a coaxial cable having the smallest outer diameter from among the plurality of coaxial cables is arranged on an outer peripheral side of the composite wire.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to composite cables.

Patent Document 1 includes an endoscope having a hollow tubular shape and flexibility, and a woven cable arranged spirally inside the endoscope tube. Cable for use is disclosed.

Japanese Unexamined Patent Publication No. 2015-136570

The endoscopy apparatus used for endoscopy has, for example, an insertion part to be inserted inside the human body. The insertion portion has a tip portion provided with a camera module, a light, or the like, and a portion of a composite cable connecting the tip portion and the main body of the endoscopy device.

The insertion part is required to be able to be deformed in order to insert it inside the human body and confirm the observation target. Then, when the insertion portion is deformed, the composite cable constituting the insertion portion is repeatedly twisted or bent. Therefore, the composite cable is required to have excellent twisting characteristics so that the cable constituting the composite cable does not break even when it is repeatedly deformed and twisted.

Therefore, it is an object of the present disclosure to provide a composite cable having excellent twisting characteristics.

The composite cable of the present disclosure includes a plurality of coaxial cables and
It has an outer peripheral coating, which is arranged on the outer circumference of the plurality of coaxial cables.
The plurality of coaxial cables include coaxial cables having different outer diameters.
The plurality of coaxial cables are twisted along the longitudinal direction to form a composite wire.
Of the plurality of coaxial cables, at least the first coaxial cable, which is the coaxial cable having the smallest outer diameter, is arranged on the outer peripheral side of the composite wire.

According to the present disclosure, it is possible to provide a composite cable having excellent twisting characteristics.

FIG. 1 is a cross-sectional view of the composite cable according to one aspect of the present disclosure in a plane perpendicular to the longitudinal direction. FIG. 2 is an explanatory diagram of the twist pitch of the composite wire. FIG. 3 is a cross-sectional view of the composite cable produced in Experimental Example 3 in a plane perpendicular to the longitudinal direction. FIG. 4 is an explanatory diagram of the twisting test.

The embodiment for carrying out will be described below.

[Explanation of Embodiments of the present disclosure]
First, embodiments of the present disclosure will be listed and described. In the following description, the same or corresponding elements are designated by the same reference numerals, and the same description is not repeated for them.

(1) The composite cable according to one aspect of the present disclosure includes a plurality of coaxial cables.
It has an outer peripheral coating, which is arranged on the outer circumference of the plurality of coaxial cables.
The plurality of coaxial cables include coaxial cables having different outer diameters.
The plurality of coaxial cables are twisted along the longitudinal direction to form a composite wire.
Of the plurality of coaxial cables, at least the first coaxial cable, which is the coaxial cable having the smallest outer diameter, is arranged on the outer peripheral side of the composite wire.

By arranging at least the first coaxial cable, which is the coaxial cable having the smallest outer diameter, on the outer peripheral side of the composite wire among the plurality of coaxial cables of the composite wire, the twisting characteristics of the composite cable can be improved. The cause of this is not clear, but it is inferred as follows. A plurality of coaxial cables are spirally twisted along the longitudinal direction to form a composite wire. Therefore, the length of the first coaxial cable included in the composite line can be lengthened by arranging the first coaxial cable on the outer peripheral side as compared with the case where the first coaxial cable is arranged on the inner peripheral side of the composite line. As a result, when the composite cable is twisted, the outer diameter is smaller than that of other coaxial cables, and the remaining capacity for expansion and contraction of the first coaxial cable, which is relatively easy to break, increases, which makes it difficult to break. ..

Note that arranging the first coaxial cable on the outer peripheral side of the composite wire means that other cables constituting the composite wire are not arranged on the outer peripheral side of the composite wire than the first coaxial cable.

(2) Of the plurality of coaxial cables, at least one of the second coaxial cables, which is the coaxial cable having the largest outer diameter, may be arranged on the outer peripheral side of the composite wire.

By arranging at least one of the second coaxial cables on the outer peripheral side of the composite wire, the twisting characteristics of the composite cable can be particularly enhanced.

(3) The composite wire may further include a plurality of insulated cables.

Insulated cables are less likely to break than coaxial cables. Therefore, since the composite wire of the composite cable further includes the insulating cable, the various members at the tip portion can be connected to the main body of the endoscope device without affecting the twisting characteristics.

(4) In the composite line, at least one of the plurality of insulated cables may be arranged inside the first coaxial cable.

By arranging at least one of the insulated cables inside the first coaxial cable, the twisting characteristics of the composite cable can be improved while suppressing the outer diameter of the composite cable.

(5) At least one of the plurality of insulated cables arranged inside the first coaxial cable may have an outer diameter larger than the outer diameter of the first coaxial cable.

By making the outer diameter of at least one of the plurality of insulated cables arranged inside the first coaxial cable larger than the outer diameter D1 of the first coaxial cable, the twisting characteristics of the composite cable can be enhanced.

(6) Of the plurality of coaxial cables, a coaxial cable having an outer diameter of 0.97 mm or less may be arranged on the outer peripheral side of the composite wire.

A coaxial cable with an outer diameter of 0.97 mm or less is easier to break than a coaxial cable with an outer diameter thicker than 0.97 mm. This is because the twisting characteristics of the cable can be particularly improved.

(7) When the outer diameter of the first coaxial cable is D1 and the outer diameter of the second coaxial cable, which is the thickest coaxial cable, is D2, D1 / D2 is 0.14 or more and 0.88 or less. It may be.

By setting D1 / D2 to 0.14 or more, the difference between the outer diameter D1 of the first coaxial cable and the outer diameter D2 of the second coaxial cable can be suppressed. Excessive force is applied only to the cable, and it is possible to prevent the cable from being easily broken.

Conventionally, in a composite cable including a plurality of coaxial cables having different outer diameters, when twisted, the coaxial cable having a small outer diameter tends to be broken. On the other hand, according to the composite cable according to one aspect of the present disclosure, even when a plurality of coaxial cables having different outer diameters are included, the coaxial cable having a small outer diameter is broken when the composite cable is twisted. Can be suppressed. Therefore, the composite cable according to one aspect of the present disclosure exhibits a higher effect as compared with the conventional composite cable as the outer diameter of the coaxial cable contained is different, for example, when D1 / D2 is 0.88 or less. Compared with the conventional composite cable, it can exhibit particularly high twisting characteristics.

(8) The twist pitch of the composite wire may be 14.4 mm or more.

By setting the twist pitch of the composite wire to 14.4 mm or more, the twisting characteristics of the composite cable can be particularly improved.

When the composite cable is twisted in the same direction as the twist direction of the composite wire, the twist pitch of the composite wire is temporarily shortened, and a force is applied to the coaxial cable or the like constituting the composite wire. Therefore, the first coaxial cable or the like having a small outer diameter may be disconnected. On the other hand, by setting the twist pitch of the composite wire to 14.4 mm or more, even when the composite cable is twisted in the same direction as the twist direction of the composite wire, the twist pitch of the composite wire becomes excessively small. It can be suppressed and the disconnection of the first coaxial cable or the like can be suppressed.

(9) A comprehensive shield may be further provided between the outer peripheral coating and the composite wire.

By providing a comprehensive shield, it is possible to cut noise intrusion into the signal transmitted by the composite cable and noise radiated to the outside.

(10) A holding winding covering the composite wire may be further provided between the composite wire and the comprehensive shield.

By arranging the restraint winding, it is possible to stably maintain the twisted shape of the coaxial cable or the like constituting the composite wire.

(11) The plurality of coaxial cables include a plurality of the first coaxial cable and a plurality of second coaxial cables which are coaxial cables having the largest outer diameter.
The plurality of the first coaxial cables and the plurality of the second coaxial cables may be arranged in a row so as to be in contact with the inner peripheral surface of the restraining winding.

By arranging the plurality of first coaxial cables and the plurality of second coaxial cables in a row so as to be in contact with the inner peripheral surface of the restraint winding, the coaxial cables that are easily broken can be arranged on the outer peripheral side of the composite wire. Therefore, the twisting characteristics of the composite cable can be particularly improved.

(12) The composite line may further include an interposition in the central portion.

Since the composite wire has an interposition, the work of twisting the coaxial cable or the like to form the composite wire can be easily performed.

[Details of Embodiments of the present disclosure]
A specific example of the composite cable according to one embodiment of the present disclosure (hereinafter referred to as “the present embodiment”) will be described below with reference to the drawings. It should be noted that the present invention is not limited to these examples, and is indicated by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.
(Composite cable)
FIG. 1 shows an example of a configuration having a cross section perpendicular to the longitudinal direction of the composite cable of the present embodiment. Further, FIG. 2 shows a side view of the composite line included in the composite cable of the present embodiment. The composite cable of the present embodiment will be described below with reference to FIGS. 1 and 2.

Each member contained in the composite cable of this embodiment will be described.
(A) Composite line The composite cable 10 of the present embodiment has a plurality of coaxial cables. The plurality of coaxial cables concerned include coaxial cables having different outer diameters. In the case of the composite cable 10 shown in FIG. 1, two types of coaxial cables having different outer diameters, a first coaxial cable 11 and a second coaxial cable 12, are included. However, the present invention is not limited to such a form, and the composite cable of the present embodiment may include three or more types of coaxial cables having different outer diameters.

The plurality of coaxial cables are twisted along the longitudinal direction to form a composite wire 13.

Here, first, the member included in the composite wire 13 will be described.
(A-1) Member of composite wire (A-1-1) Coaxial cable The configuration of the coaxial cable is not particularly limited. Explaining the configuration of the coaxial cable by taking the second coaxial cable 12 as an example, the inner conductor 12A, the insulator 12B, the shield conductor 12C, and the outer cover 12D are sequentially provided from the center side in the cross section perpendicular to the longitudinal direction. Have.

The inner conductor 12A is used as the central conductor of the second coaxial cable 12. Examples of the material of the inner conductor 12A include copper, aluminum, and a copper alloy. The surface of the inner conductor may be plated with silver or tin. Therefore, for example, a silver-plated copper alloy, a tin-plated copper alloy, or the like can be used as the internal conductor 12A. The inner conductor 12A may be a single wire (wire) or a stranded wire obtained by twisting a plurality of wires.

The material constituting the insulator 12B is not particularly limited, but polytetrafluoroethylene (PTFE), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), and the like. Fluororesin such as ethylene-tetrafluoroethylene copolymer (ETFE) and resin such as polyester resin such as polyethylene terephthalate (PET) can be used.

The shield conductor 12C has a structure in which a metal wire is horizontally wound or braided around the outer periphery of the insulator 12B. As the material of the metal wire included in the shield conductor 12C, copper, aluminum, a copper alloy or the like can be used. The surface of the metal wire of the shield conductor may be plated with silver or tin. Therefore, as the metal wire of the shield conductor, for example, a silver-plated copper alloy, a tin-plated copper alloy, or the like can be used.

The material constituting the outer cover 12D is not particularly limited, but a resin such as the above-mentioned fluororesin or polyester resin can be used for the insulator 12B.

Although described here using the second coaxial cable 12, the first coaxial cable 11 may also have an internal conductor, an insulator, a shield conductor, and an outer cover. The material of each member of the first coaxial cable 11 is not particularly limited, but for example, the same material as that described with respect to the second coaxial cable 12 can be used.

As described above, the composite cable of the present embodiment can have a plurality of coaxial cables having different outer diameters. When the outer diameter of the first coaxial cable 11 which is the thinnest outer diameter coaxial cable is D1 and the outer diameter of the second coaxial cable 12 which is the thickest outer diameter coaxial cable is D2, D1 and D2 are particularly limited. However, it is preferable that D1 / D2 is 0.14 or more and 0.88 or less. Further, D1 / D2 is more preferably 0.20 or more and 0.70 or less.

By setting D1 / D2 to 0.14 or more, the difference between the outer diameter D1 of the first coaxial cable 11 and the outer diameter D2 of the second coaxial cable 12 can be suppressed. 1 Excessive force is applied only to the coaxial cable 11, and it is possible to prevent the cable from being easily broken.

Conventionally, in a composite cable including a plurality of coaxial cables having different outer diameters, when twisted, the coaxial cable having a small outer diameter tends to be broken. On the other hand, according to the composite cable of the present embodiment, even when a plurality of coaxial cables having different outer diameters are included, it is possible to prevent the coaxial cable having a small outer diameter from being broken when the composite cable is twisted. .. Therefore, the composite cable of the present embodiment exerts a higher effect as compared with the conventional composite cable as the outer diameter of the coaxial cable to have is different. For example, when D1 / D2 is 0.88 or less, the conventional composite cable is used. Compared to composite cables, it can exhibit particularly high twisting characteristics.

For example, in an experimental example described later, the outer diameter D11A of the inner conductor 11A of the first coaxial cable 11 is 0.048 mm, and the outer diameter D12A of the inner conductor 12A of the second coaxial cable 12 is 0.090 mm. That is, the outer diameter D11A of the inner conductor 11A of the first coaxial cable 11 is smaller than the outer diameter D12A of the inner conductor 12A of the second coaxial cable 12.

The film thickness L11B of the insulator 11B of the first coaxial cable 11 is 0.030 mm, and the film thickness L12B of the insulator 12B of the second coaxial cable 12 is 0.075 mm. That is, the film thickness L11B of the insulator 11B of the first coaxial cable 11 is smaller than the film thickness L12B of the insulator 12B of the second coaxial cable 12.

As described above, by reducing the film thickness of the insulator of the first coaxial cable 11 according to the small internal conductor, the bending rigidity of the first coaxial cable can be reduced and the composite cable can be easily bent. ..
(A-1-2) Insulated Cable The composite wire 13 included in the composite cable 10 of the present embodiment may further include an insulated cable in addition to the coaxial cable described above.

Insulated cables are less likely to break than coaxial cables, as will be described later. Therefore, since the composite wire 13 of the composite cable 10 further includes an insulating cable, various members at the tip portion can be connected to the endoscopy apparatus main body without affecting the twisting characteristics.

When the composite wire 13 further includes an insulated cable, the composite wire 13 can be configured by twisting the insulated cable together with the plurality of coaxial cables. For example, as shown in FIG. 1, the composite wire 13 can include a plurality of insulated cables. FIG. 1 shows an example of having two types of insulated cables, a first insulated cable 15 having a different outer diameter and a second insulated cable 16, but the present invention is not limited to this. When the composite wire 13 has an insulated cable, the insulated cable may have only one type having the same outer diameter and configuration, or may have three or more types of insulated cables having different outer diameters and configurations. good. Further, the number of insulated cables included in the composite wire 13 is not particularly limited, and any number can be included. FIG. 1 shows an example in which an insulated cable having an outer diameter D16 of the second insulated cable 16 smaller than the outer diameter D15 of the first insulated cable 15 is used in combination as the first insulated cable 15 and the second insulated cable 16. ing.

Explaining the configuration of the insulated cable by taking the first insulated cable 15 as an example, it has an internal conductor 15A and an insulator 15B in order from the center side in a cross section perpendicular to the longitudinal direction.

Examples of the material of the inner conductor 15A include copper, aluminum, and a copper alloy. The surface of the inner conductor 15A may be plated with silver or tin. Therefore, for example, a silver-plated copper alloy, a tin-plated copper alloy, or the like can be used as the internal conductor. The inner conductor 15A may be a single wire (wire) or a stranded wire obtained by twisting a plurality of wires.

The material constituting the insulator 15B is not particularly limited, but polytetrafluoroethylene (PTFE), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), and the like. Fluororesin such as ethylene-tetrafluoroethylene copolymer (ETFE) and resin such as polyester resin such as polyethylene terephthalate (PET) can be used.

Although the first insulated cable 15 has been described here, other insulated cables, for example, the second insulated cable 16 may also have an internal conductor and an insulator. The material of each member of the other insulated cable is not particularly limited, but for example, the same material as described in the first insulated cable 15 can be used.
(A-1-3) The intervening composite line 13 may further include the intervening 19 in the central portion.

The interposition 19 can be composed of fibers such as rayon and nylon yarn. The interposition may be composed of tensile strength fibers.

The interposition can be placed in a gap surrounded by a coaxial cable or an insulated cable.

Since the composite wire 13 has an interposition, the work of twisting the coaxial cable or the like to form the composite wire 13 can be easily performed.
(A-2) Arrangement of Each Member The inventor of the present invention relates to a composite cable having excellent twisting characteristics, which can suppress disconnection of the cables constituting the composite cable even when the composite cable is repeatedly twisted. Study was carried out.

As described above, the composite cable of the present embodiment may include a coaxial cable and, if necessary, an insulated cable. According to the study of the inventor of the present invention, the coaxial cable is more likely to break than the insulated cable when the composite cable is repeatedly twisted. Then, they have found that the ease of disconnection of the coaxial cable changes and the twisting characteristic of the composite cable changes depending on the arrangement of the coaxial cable in the composite cable, and completed the present invention.
(A-2-1) Arrangement of Coaxial Cable In the composite cable 10 of the present embodiment, at least the first coaxial cable 11 which is the smallest coaxial cable among the plurality of coaxial cables included in the composite wire 13 is used. , It is preferable to arrange the composite line 13 on the outer peripheral surface 13A side.

In this way, by arranging at least the first coaxial cable 11, which is the coaxial cable having the smallest outer diameter among the plurality of coaxial cables of the composite wire 13, on the outer peripheral 13A side of the composite wire 13, the composite cable 10 can be used. The twisting characteristics can be improved. The cause of this is not clear, but it is inferred as follows. As described above, the plurality of coaxial cables are spirally twisted along the longitudinal direction to form a composite wire 13. Therefore, by arranging the first coaxial cable 11 on the outer peripheral 13A side rather than on the inner peripheral 13B side (inside) of the composite wire 13, the length of the first coaxial cable 11 included in the composite wire 13 is long. Can be lengthened. As a result, when the composite cable 10 is twisted, the outer diameter is smaller than that of other coaxial cables, and the remaining capacity for expansion and contraction of the first coaxial cable 11 which is relatively easy to break becomes large, and it becomes difficult to break. Conceivable.

Note that arranging the first coaxial cable 11 on the outer peripheral 13A side of the composite wire 13 means that the composite wire 13 is configured on the outer peripheral 13A side of the composite wire 13 with respect to the first coaxial cable 11 as shown in FIG. It means that the cable is not placed.

FIG. 1 shows an example of having two types of coaxial cables, a first coaxial cable 11 and a second coaxial cable 12, but as described above, the composite wire 13 has three or more types having different outer diameters. It is also possible to have a coaxial cable of.

In this case, among the plurality of coaxial cables, it is preferable that the coaxial cable having an outer diameter of 0.97 mm or less is arranged on the outer peripheral side of the composite wire 13. This is because a coaxial cable with an outer diameter of 0.97 mm or less is easier to break than a coaxial cable with an outer diameter thicker than 0.97 mm, so by arranging it on the outer peripheral side of the composite wire 13, disconnection is suppressed. However, the twisting characteristics of the composite cable can be particularly improved.

However, as described above, among the cables constituting the composite wire 13, the coaxial cable is more likely to be broken than the insulated cable. Therefore, as shown in FIG. 1, at least one of the second coaxial cable 12, which is the coaxial cable having the largest outer diameter among the plurality of coaxial cables, is also arranged on the outer peripheral 13A side of the composite wire 13. It is preferable to have. By arranging at least one of the second coaxial cables 12 on the outer peripheral 13A side of the composite wire 13, the twisting characteristics of the composite cable 10 can be particularly enhanced.

As shown in FIG. 1, the plurality of coaxial cables included in the composite cable 10 of the present embodiment can include a plurality of first coaxial cables 11 and a plurality of second coaxial cables 12. The plurality of first coaxial cables 11 and the plurality of second coaxial cables 12 are preferably arranged in a row so as to be in contact with the inner peripheral surface 18A of the restraint winding 18 described later.

By arranging the plurality of first coaxial cables 11 and the plurality of second coaxial cables 12 in a row so as to be in contact with the inner peripheral surface 18A of the restraint winding 18 in this way, the coaxial cables that are easily broken can be combined with the composite wire 13. It can be arranged on the outer circumference 13A side of the. Therefore, the twisting characteristics of the composite cable can be particularly improved.
(A-2-2) Arrangement of insulated cables The arrangement of insulated cables is not particularly limited. As described above, according to the study of the inventor of the present invention, the insulated cable is less likely to be broken as compared with the coaxial cable. Therefore, for example, in the composite wire 13, it is preferable that at least one of the plurality of insulated cables is arranged inside the first coaxial cable 11.

By arranging at least one of the plurality of insulated cables inside the first coaxial cable, the twisting characteristics of the composite cable can be improved while suppressing the outer diameter of the composite cable.

At this time, it is preferable that at least one of the plurality of insulated cables arranged inside the first coaxial cable 11 has an outer diameter larger than the outer diameter D1 of the first coaxial cable 11.

By making the outer diameter of at least one of the plurality of insulated cables arranged inside the first coaxial cable 11 larger than the outer diameter D1 of the first coaxial cable 11, the twisting characteristics of the composite cable are improved. Be done.

In the case of the composite cable 10 shown in FIG. 1, for example, it is preferable that the outer diameter D15 of the first insulated cable 15 is thicker than the outer diameter D1 of the first coaxial cable. It is more preferable that the outer diameter D16 of the second insulated cable 16 is also thicker than the outer diameter D1 of the first coaxial cable 11.
(A-3) Twist pitch The twist pitch of the composite wire 13 is not particularly limited, but according to the study of the inventor of the present invention, it is preferably 14.4 mm or more, and more preferably 20.0 mm or more. preferable.

By setting the twist pitch of the composite wire 13 to 14.4 mm or more, the twisting characteristics of the composite cable can be particularly improved.

When the composite cable 10 is twisted in the same direction as the twist direction of the composite wire, the twist pitch of the composite wire is temporarily shortened, and a force is applied to the coaxial cable or the like constituting the composite wire 13. Therefore, the first coaxial cable or the like having a small outer diameter may be disconnected. On the other hand, by setting the twist pitch of the composite wire 13 to 14.4 mm or more, the twist pitch of the composite wire becomes excessively small even when the composite cable 10 is twisted in the same direction as the twist direction of the composite wire. This can be suppressed and the disconnection of the first coaxial cable or the like can be suppressed.

The upper limit of the twist pitch of the composite wire 13 is not particularly limited, but is preferably 40.0 mm or less, and more preferably 35.0 mm or less, for example.

The twist pitch means the length at which the cable is twisted once. The said length means the length along the central axis of the composite line 13.

FIG. 2 shows a side view of the composite line 13. As shown in FIG. 1, the composite wire 13 includes two first coaxial cables 111 and 112 and six second coaxial cables 121 to 126 and two first isolated cables 151 on the outer peripheral 13A side. It has 152. Therefore, the first coaxial cables 111 and 112, the second coaxial cables 121 to 126, and the first insulated cables 151 and 152 appear repeatedly on the side surface of the composite wire 13 in this order.

Then, as shown in FIG. 2, on the side surface of the composite wire 13, the distance between the same cables along the central axis CA, for example, between the second coaxial cables 121, is the twist pitch Pt of the composite wire 13.

The twist pitch can be measured, for example, by the method described in JIS C 3002 (1992).
(B) Outer peripheral coating The composite cable 10 of the present embodiment may have an outer peripheral coating 14 arranged on the outer periphery of a plurality of coaxial cables. That is, the outer peripheral coating 14 is arranged so as to cover the outer periphery of the composite line 13.

The material constituting the outer peripheral coating 14 is not particularly limited, but polytetrafluoroethylene (PTFE), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), and the like. Fluororesin such as ethylene-tetrafluoroethylene copolymer (ETFE) and resin such as polyester resin such as polyethylene terephthalate (PET) can be used.

By providing the outer peripheral coating 14, it is possible to protect the members constituting the composite cable such as the composite wire 13.
(C) Comprehensive shield A comprehensive shield may be further provided between the outer peripheral coating 14 and the composite wire 13.

By providing a comprehensive shield, it is possible to cut noise intrusion into the signal transmitted by the composite cable and noise radiated to the outside.

The comprehensive shield 17 has a structure in which a metal wire is horizontally wound or braided around the outer periphery of the composite wire 13. As the material of the metal wire included in the general shield 17, copper, aluminum, a copper alloy, or the like can be used. The surface of the metal wire of the general shield may be plated with silver or tin. Therefore, as the metal wire of the comprehensive shield, for example, a silver-plated copper alloy, a tin-plated copper alloy, or the like can be used.
(D) Restraining winding The composite cable 10 of the present embodiment may further have a restraining winding 18 covering the composite wire 13 between the composite wire 13 and the general shield 17.

The restraint winding 18 covers the composite wire 13. By arranging the holding winding 18, it is possible to stably maintain the twisted shape of the coaxial cable or the like constituting the composite wire 13.

As the holding roll 18, for example, a paper tape, a non-woven fabric, or a resin tape such as polyester can be used. Further, the holding roll 18 may be spirally wound along the longitudinal direction of the core, or may be vertically attached, that is, the holding paper may be arranged vertically along the longitudinal direction of the core. Further, the winding direction may be Z winding or S winding.

Specific examples will be given below, but the present invention is not limited to these examples.
(Evaluation methods)
First, an evaluation method of the composite cable produced in the following experimental example will be described.
(1) Outer diameter of cable The outer diameter of the coaxial cable and the insulated cable used for the composite cable produced in the following experimental examples was measured using a micrometer by the method described in JIS C 3002 (1992).
(2) Twist pitch The twist pitch of the composite wire was measured by the method described in JIS C 3002 (1992).
(3) Twisting characteristics A test method for twisting characteristics will be described with reference to FIG.

The composite cable C having a length of 2 m produced in the following experimental example was hung vertically, and the upper end and the lower end of the composite cable C were gripped by chucks 411 and 412, respectively. With the chuck 412 at the lower end fixed, the chuck 411 at the upper end was twisted left and right around the axis 42 of the composite cable C from -360 ° to + 360 ° at a speed of 30 rotations / minute. The twisting test was performed while measuring the resistance value of one first coaxial cable, and the number of times until the resistance value increased to 10 times or more the initial resistance value was measured. The number of twists until the movement from -360 ° to + 360 ° is set to one. The larger the number of twists, the better the twisting characteristics.

It was evaluated as A when the number of twists until the first coaxial cable was broken was 15,000 or more, B when it was 10,000 or more and less than 15,000, and C when it was less than 10,000. When the evaluation is A or B, it can be evaluated as a composite cable having excellent twisting characteristics.

The composite cable in each experimental example will be described below. Experimental Example 1 and Experimental Example 2 are Examples, and Experimental Example 3 is a Comparative Example.
(Experimental Example 1)
By the following procedure, a composite cable 10 having a structure whose cross section perpendicular to the longitudinal direction has the structure shown in FIG. 1 was produced.

The first coaxial cable 11, the second coaxial cable 12, the first insulated cable 15, and the second insulated cable 16 included in the composite wire 13 of the composite cable 10 have the configurations shown in Table 1.

A composite wire 13 was produced by using two first coaxial cables 11, six second coaxial cables 12, three first insulated cables 15, one second insulated cable 16, and an interposition 19.

As shown in FIG. 1, the coaxial cable and the insulated cable are arranged so as to surround the interposition 19, and the first coaxial cables 111 and 112 and the second coaxial cables 121 to 126 and the second coaxial cables 121 to 126 are arranged on the outer peripheral 13A side of the composite wire 13. 1 Insulated cables 151 and 152 were arranged. The first insulated cable 153 was arranged on the inner circumference 13B side of the composite wire 13 with respect to the first coaxial cable 111. Similarly, the second insulated cable 16 is also arranged on the inner peripheral 13B side of the composite wire 13 with respect to the first coaxial cable 111.

The twist pitch of the obtained composite wire 13 was set to 30 mm.

Further, a sintered PTFE tape was wound around Z winding around the outer periphery of the composite wire 13 to form a restraining winding 18. As a result, the plurality of first coaxial cables 11 and the plurality of second coaxial cables 12 are arranged in a row so as to be in contact with the inner peripheral surface 18A of the restraint winding 18 as shown in FIG.

A comprehensive shield 17 and an outer peripheral coating 14 are arranged on the outer periphery of the restraint winding 18. The configurations of the general shield 17 and the outer peripheral coating 14 are as shown in Table 2.

When the twisting test described above was performed on the obtained composite cable, the evaluation result was A.
(Experimental Example 2)
When manufacturing the composite wire 13, the twist pitch of the composite wire was set to 13 mm. Except for the above points, a composite cable was manufactured in the same manner as in Experimental Example 1, and the twisting test described above was performed. As a result, the evaluation result was B.
(Experimental Example 3)
When manufacturing the composite wire 13, the arrangement of the coaxial cable and the insulated cable was changed to manufacture the composite cable 30 shown in FIG.

Specifically, all the first insulated cables 151 to 153 are arranged on the outer peripheral 13A side of the composite wire 13. Then, the first coaxial cables 111 and 112 were arranged on the inner peripheral 13B side of the composite wire 13. A composite cable was manufactured in the same manner as in Experimental Example 1 except for the above points, and the twisting test described above was performed. The evaluation result of the twist test was C.

実験例１～実験例３の結果から明らかなように、複数の外径の異なる同軸ケーブルを有する複合線について、最も径の細い第１同軸ケーブル１１を、複合線１３の外周側に配置することで、該複合線を含む複合ケーブルの捻回特性を高められることを確認できた。

As is clear from the results of Experimental Examples 1 to 3, for a composite wire having a plurality of coaxial cables having different outer diameters, the first coaxial cable 11 having the smallest diameter is arranged on the outer peripheral side of the composite wire 13. Therefore, it was confirmed that the twisting characteristics of the composite cable including the composite wire can be enhanced.

10, 30, C Composite cable 11, 111, 112 First coaxial cable 12, 121 to 126 Second coaxial cable 11A, 12A Inner conductor 11B, 12B Insulator 12C Shield conductor 12D Outer cover 13 Composite wire 13A Outer circumference 13B Inner circumference 14 Outer circumference coating 15, 151 to 153 First insulating cable 15A Inner conductor 15B Insulator 16 Second insulating cable 17 Comprehensive shield 18 Suppressed winding 18A Inner peripheral surface 19 Intervening D1 Outer diameter D2 Outer diameter D11A Outer diameter L11B Thickness D12A Outer diameter L12B Film thickness CA center axis Pt twist pitch 411, 412 chuck

Claims (12)

With multiple coaxial cables,
It has an outer peripheral coating, which is arranged on the outer circumference of the plurality of coaxial cables.
The plurality of coaxial cables include coaxial cables having different outer diameters.
The plurality of coaxial cables are twisted along the longitudinal direction to form a composite wire.
A composite cable in which at least the first coaxial cable, which is the smallest coaxial cable among the plurality of coaxial cables, is arranged on the outer peripheral side of the composite wire. The composite cable according to claim 1, wherein at least one of the second coaxial cables, which is the coaxial cable having the thickest outer diameter among the plurality of coaxial cables, is arranged on the outer peripheral side of the composite line. The composite cable according to claim 1 or 2, wherein the composite wire further includes a plurality of insulated cables. The composite cable according to claim 3, wherein at least one of the plurality of insulated cables in the composite wire is arranged inside the first coaxial cable. The composite cable according to claim 4, wherein at least one of the plurality of insulated cables arranged inside the first coaxial cable has an outer diameter larger than the outer diameter of the first coaxial cable. The composite cable according to any one of claims 1 to 5, wherein a coaxial cable having an outer diameter of 0.97 mm or less is arranged on the outer peripheral side of the composite wire among the plurality of coaxial cables. When the outer diameter of the first coaxial cable is D1 and the outer diameter of the second coaxial cable, which is the thickest coaxial cable, is D2,
The composite cable according to any one of claims 1 to 6, wherein D1 / D2 is 0.14 or more and 0.88 or less. The composite cable according to any one of claims 1 to 7, wherein the twist pitch of the composite wire is 14.4 mm or more. The composite cable according to any one of claims 1 to 8, further comprising a comprehensive shield between the outer peripheral coating and the composite wire. The composite cable according to claim 9, further comprising a holding winding covering the composite wire between the composite wire and the general shield. The plurality of coaxial cables include a plurality of the first coaxial cable and a plurality of second coaxial cables which are coaxial cables having the largest outer diameter.
The composite cable according to claim 10, wherein the plurality of the first coaxial cables and the plurality of the second coaxial cables are arranged in a row so as to be in contact with the inner peripheral surface of the restraining winding. The composite cable according to any one of claims 1 to 11, wherein the composite line further includes an interposition in the center.

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