Coaxial cable and method for manufacturing coaxial cable

Abstract

A coaxial cable (100a) comprises a first conductor part (1) and a second conductor part (2). The first conductor part (1) has an internal space (V). The first conductor part (1) extends along a central axis (A). The first conductor part (1) includes a first conductor section (11) and a first insulating section (12). The first insulating section (12) covers a surface (11s) of the first conductor section (11). A first through-hole (H1) is formed in the second conductor part (2), in a side surface (20s) surrounding the central axis (A). The first conductor part (1) is inserted into the internal space (V) via the first through-hole (H1).

Description

Coaxial cable and method for manufacturing the same

[0001] TECHNICAL FIELD The present disclosure relates to coaxial cables and methods for manufacturing coaxial cables.

[0002] 2. Description of the Related Art Conventionally, a coaxial cable has been known in which an outer conductor is disposed around an inner conductor (see, for example, Japanese Patent Application Laid-Open No. 03-214513).

[0003] See Japanese Patent Application Publication No. 03-214513

[0004] However, the coaxial cable described above is manufactured through a number of manufacturing steps, such as forming a coaxial wire by sequentially providing an insulating layer, a shielding layer, and an outer coating layer on the outer periphery of a central conductor, and then carrying out a pressure treatment as necessary. Therefore, there is room for improvement in the manufacturing of the coaxial cable.

[0005] The present disclosure has been made to solve the above-mentioned problems, and an object of the present disclosure is to provide a coaxial cable that is easy to manufacture.

[0006] A coaxial cable according to the present disclosure includes a first conductor portion and a second conductor portion. The first conductor portion has an internal space. The first conductor portion extends along a central axis. The first conductor portion includes a first conductor portion and a first insulating portion. The first insulating portion covers the surface of the first conductor portion. A first through hole is formed on a side surface of the second conductor portion surrounding the central axis. The first conductor portion is inserted into the internal space through the first through hole.

[0007] A method for manufacturing a coaxial cable according to the present disclosure includes the steps of preparing a first conductor portion and a second conductor portion, covering the first conductor portion with a first insulating portion, forming a first through hole and a second through hole in the second conductor portion, extending the first conductor portion from the first through hole through an internal space to the second through hole, and covering the second conductor portion with the second insulating portion.

[0008] According to the above, a coaxial cable that is easy to manufacture can be obtained.

[0009] FIG. 1 is a schematic perspective view of a coaxial cable according to a first embodiment. FIG. 2 is a schematic plan view of the coaxial cable according to the first embodiment. FIG. 3 is a schematic cross-sectional view of the coaxial cable taken along line III-III in FIG. 2. FIG. 4 is a schematic cross-sectional view of the coaxial cable taken along line IV-IV in FIG. 2. FIG. 5 is a schematic cross-sectional view of the coaxial cable taken along line V-V in FIG. 2. FIG. 6 is a flowchart of a method for manufacturing a coaxial cable according to the first embodiment. FIG. 7 is a schematic plan view showing a step in the method for manufacturing a coaxial cable according to the first embodiment. FIG. 8 is a schematic plan view showing a step subsequent to the step shown in FIG. 7 in the method for manufacturing a coaxial cable according to the first embodiment. FIG. 9 is a schematic plan view showing a step subsequent to the step shown in FIG. 8 in the method for manufacturing a coaxial cable according to the first embodiment. FIG. 10 is a schematic plan view showing a step subsequent to the step shown in FIG. 9 in the method for manufacturing a coaxial cable according to the first embodiment. FIG. 11 is a schematic plan view showing a step subsequent to the step shown in FIG. 10 in the method for manufacturing a coaxial cable according to the first embodiment. Fig. 12 is a schematic plan view showing a step subsequent to the step shown in Fig. 11 in the method for manufacturing a coaxial cable according to embodiment 1. Fig. 13 is a schematic plan view showing a step subsequent to the step shown in Fig. 12 in the method for manufacturing a coaxial cable according to embodiment 1. Fig. 14 is a schematic perspective view of a coaxial cable according to embodiment 2. Fig. 15 is a schematic cross-sectional view of the coaxial cable according to embodiment 2.

[0010] Hereinafter, embodiments of the present disclosure will be described. Unless otherwise specified, the same or corresponding parts in the following drawings will be denoted by the same reference numerals, and the description thereof will not be repeated.

[0011] First Embodiment <Configuration of Coaxial Cable> Fig. 1 is a schematic perspective view of a coaxial cable 100a according to the first embodiment. Fig. 2 is a schematic plan view of the coaxial cable 100a according to the first embodiment. Fig. 3 is a schematic cross-sectional view of the coaxial cable 100a taken along line III-III in Fig. 2. Fig. 4 is a schematic cross-sectional view of the coaxial cable 100a taken along line IV-IV in Fig. 2. Fig. 5 is a schematic cross-sectional view of the coaxial cable 100a taken along line V-V in Fig. 2.

[0012] The coaxial cable 100a shown in Figures 1 to 5 is a coaxial cable 100a through which a high-frequency current of, for example, 10 kHz or more flows, and mainly includes a first conductor portion 1, a second conductor portion 2, and a terminal 3.

[0013] 3 to 5 , the first conductor portion 1 has a first conductor portion 11 and a first insulating portion 12. The first insulating portion 12 covers the surface 11s of the first conductor portion 11. The second conductor portion 2 has a second conductor portion 21 and a second insulating portion 22. The second insulating portion 22 covers the surface 21s1 of the second conductor portion 21.

[0014] As shown in FIG. 2 , the first conductor portion 1 and the second conductor portion 2 extend along the central axis A. The first conductor portion 1 and the second conductor portion 2 are flat in shape. In plan view, the first conductor portion 1 and the second conductor portion 2 are preferably arranged so as to overlap each other. From a different perspective, when the first conductor portion 1 and the second conductor portion 2 are flat in shape, the first conductor portion 1 and the second conductor portion 2 preferably face each other, as shown in FIGS. 4 and 5 . In this way, the area of ​​the surfaces where the first conductor portion 11 and the second conductor portion 21 face each other increases, reducing current imbalance. As a result, heat generation in the coaxial cable 100a is suppressed.

[0015] Each of the first conductor portion 11 and the second conductor portion 21 is, for example, a cylindrical conductor with both ends open. That is, each of the first conductor portion 11 and the second conductor portion 21 is conductive. Each of the first conductor portion 11 and the second conductor portion 21 may have a shape that is stretchable. Specifically, each of the first conductor portion 11 and the second conductor portion 21 may be an aggregate of conductive fibers. For example, each of the first conductor portion 11 and the second conductor portion 21 may have a configuration in which the fibers are twisted together or a braided configuration.

[0016] As will be described later, in order to suppress heat generation in the coaxial cable 100a, it is preferable that the first conductor portion 1 and the second conductor portion 2 have a flat shape. Therefore, the first conductor portion 11 and the second conductor portion 21 may each have a foil shape, a tape shape, a plain weave shape, or a plain braid shape.

[0017] The material constituting each of the first conductor portion 11 and the second conductor portion 21 may be a braid. By using the same material constituting the first conductor portion 11 as the material constituting the second conductor portion 21, the number of types of parts can be reduced, leading to cost savings.

[0018] The first conductor portion 11 and the second conductor portion 21 may include, for example, any of copper wire, copper alloy wire, aluminum wire, carbon fiber wire, copper-plated polyester fiber wire, semiconductor fiber wire, and composite fiber wire. Examples of semiconductor fiber wire include carbon nanotube fiber and silicon fiber. Composite fiber wire is formed by interweaving at least one of metal fiber and semiconductor fiber with at least one of glass fiber, resin fiber, carbon fiber, basalt fiber, ceramic fiber, and alumina fiber.

[0019] 4, the first insulating portion 12 covers the first conductor portion 11 so that the first conductor portion 11 is insulated from the second conductor portion 21. The second insulating portion 22 covers the second conductor portion 21 so that the second conductor portion 21 is insulated from the surroundings of the second conductor portion 21.

[0020] For example, a rubber tube, a heat-shrinkable tube, or a braided tube may be used as the first insulating portion 12 and the second insulating portion 22. The material constituting the heat-shrinkable tube includes, for example, at least one of polyolefin, silicone, and fluororesin.

[0021] Rubber tubes and heat-shrinkable tubes are flexible. Therefore, when they are used as covering materials for conductors, the covering material adheres closely to the conductor, preventing the covering material from coming off the conductor. Furthermore, when used as covering materials, rubber tubes and heat-shrinkable tubes can provide a good appearance.

[0022] The braided tube is made of, for example, fiber. The material constituting the braided tube may include, for example, nylon, silk thread, or glass fiber. When the braided tube is used as a covering material for a conductor, the braided tube takes a shape that conforms to the shapes of the first conductor portion 11 and the second conductor portion 21. In other words, when the first conductor portion 11 and the second conductor portion 21 are flat, the first conductor section 1 composed of the first conductor portion 11 and the first insulating portion 12, and the second conductor section 2 composed of the second conductor portion 21 and the second insulating portion 22, each take a flat shape.

[0023] Terminals 3 are connected to the ends of the first conductor portion 1 and the second conductor portion 2. Specifically, as shown in FIGS. 1 to 3 , terminal 31a is connected to one end of the first conductor portion 1. Terminal 31b is connected to the other end of the first conductor portion 1 opposite to the one end to which terminal 31a is connected. Terminal 32a is connected to one end of the second conductor portion 2. Terminal 32b is connected to the other end of the second conductor portion 2 opposite to the one end to which terminal 32a is connected. The positions at which terminals 31b and 32b are arranged are opposite the positions at which terminals 31a and 32a are arranged.

[0024] The terminal 3 may be connected to the ends of the first conductor portion 1 and the second conductor portion 2 by, for example, crimping. The terminal 3 connected to the ends of the first conductor portion 1 and the second conductor portion 2 in this manner is connected to an external device (not shown). As shown in Figures 1 to 3, the terminal 3 may have a terminal hole h formed therein.

[0025] 2, the shape of the terminal 3 is preferably rectangular in plan view. This increases the area where, for example, the terminal 31a connected to one end of the first conductor portion 1 and the terminal 32a connected to one end of the second conductor portion 2 overlap in plan view. As a result, the bias of the current flowing through the terminal 3 is suppressed.

[0026] The terminal 31a connected to one end of the first conductor portion 1 can be connected to, for example, a positive terminal of an external device. On the other hand, the terminal 32a connected to one end of the second conductor portion 2 can be connected to, for example, a negative terminal of an external device. In this way, the direction of the current flowing through the first conductor portion 11 is opposite to the direction of the current flowing through the second conductor portion 21.

[0027] Here, a feature of the coaxial cable 100a according to the first embodiment is that, as shown in Fig. 1 and Fig. 3 , a portion 1c of the first conductor portion 1 is inserted into an internal space V of the second conductor portion 2. Specifically, as shown in Fig. 3 , a first through hole H1 and a second through hole H2 are formed on a side surface 20s of the second conductor portion 2. The second conductor portion 2 has an internal space V. As shown in Fig. 4 , the internal space V is a region surrounded by an inner circumferential surface 21s2 of the second conductor portion 21.

[0028] The first through hole H1 and the second through hole H2 communicate from the outside of the second conductor portion 2 to the internal space V. On the central axis A, the first through hole H1 is located on one end where the terminals 31 a and 32 a are arranged. On the central axis A, the second through hole H2 is located on the other end where the terminals 31 b and 32 b are arranged.

[0029] The first conductor portion 1 is inserted into the internal space V through the first through hole H1 and the second through hole H2. Specifically, the first conductor portion 1 has one end 1l and the other end 1r. In the first conductor portion 1, the one end 1l is located from the first through hole H1 to the outside of the second conductor portion 2. In the first conductor portion 1, the other end 1r extends to the outside of the second conductor portion 2 through the second through hole H2. The other end 1r is located on the opposite side of the one end 1l. A portion 1c of the first conductor portion 1, which is located between the one end 1l and the other end 1r, is located within the internal space V. Note that in FIG. 1 , the portion 1c of the first conductor portion 1 that is located within the internal space V is indicated by dotted lines.

[0030] As shown in FIG. 4 , in a portion 1c of the first conductor section 1 disposed in the internal space V, the first conductor portion 11 is surrounded by the second conductor portion 21. In this case, the direction of magnetic flux b2 generated by the current flowing through the second conductor portion 21 is around the central axis A. The direction of magnetic flux b1 generated by the current flowing through the first conductor portion 11 is also around the central axis A. That is, the center of magnetic flux b2 generated by the current flowing through the second conductor portion 21 coincides with the center of magnetic flux b1 generated by the current flowing through the first conductor portion 11. The direction of current flowing through the first conductor portion 11 and the direction of current flowing through the second conductor portion 21 are opposite to each other. Therefore, the magnetic flux b1 generated by the current flowing through the first conductor portion 11 and the magnetic flux b2 generated by the current flowing through the second conductor portion 21 are generated in directions that cancel each other out outside the coaxial cable 100a. As a result, the emission of electromagnetic noise outside the coaxial cable 100a is suppressed. In the first embodiment, by forming a through hole in the second conductor portion 2, the coaxial cable 100a that can achieve the above-mentioned effects can be easily manufactured.

[0031] 5, the first conductor portion 1 and the second conductor portion 2 can be disposed spaced apart from each other at one end 1l and the other end 1r in FIG. 1. Due to the proximity effect, current flows so as to be biased toward the surfaces where the first conductor portion 11 and the second conductor portion 21 face each other. If the first conductor portion 1 and the second conductor portion 2 are flat in plan view, current bias is suppressed. In other words, the greater the widths of the first conductor portion 1 and the second conductor portion 2 in plan view, the greater the area of ​​the surfaces where the first conductor portion 11 and the second conductor portion 21 face each other, and heat generation in the coaxial cable 100a is suppressed.

[0032] In FIGS. 4 and 5, the nominal cross-sectional area of ​​the first conductor portion 11 and the second conductor portion 21 is, for example, 20 mm ２ The nominal cross-sectional area of ​​the first conductor portion 11 and the second conductor portion 21 is, for example, 10 mm ２It is preferable that the first conductor portion 11 and the second conductor portion 21 have the same nominal cross-sectional area. Furthermore, the larger the nominal cross-sectional areas of the first conductor portion 11 and the second conductor portion 21, the smaller the resistance value. As a result, heat generation in the coaxial cable 100a is suppressed.

[0033] <Method of Manufacturing Coaxial Cable> Fig. 6 is a flowchart of a method of manufacturing the coaxial cable 100a according to the first embodiment. The method of manufacturing the coaxial cable 100a will be described below. As shown in Fig. 7, the method of manufacturing the coaxial cable 100a includes a step (S1) of preparing the first conductor portion 11 and the second conductor portion 21. In this step (S1), components required for the steps described below, such as the first conductor portion 11 and the second conductor portion 21, are prepared.

[0034] Next, a step (S2) is carried out to cover the first conductor portion 11 with the first insulating portion 12. In this step (S2), as shown in Fig. 8, the surface 11s of the first conductor portion 11 is covered with the first insulating portion 12. Note that the area indicated by the dotted line in Fig. 8 corresponds to the first conductor portion 11. In this manner, the first conductor 1 is manufactured.

[0035] Next, a step (S3) is performed to form a first through hole H1 and a second through hole H2 in the second conductor portion 21. In this step (S3), first, as shown in FIG. 9 , one end and the other end of the second conductor portion 21 are pressed in the direction of the central axis A. In this way, the second conductor portion 21 is compressed in the direction of the central axis A. As a result, the second conductor portion 21 expands in the short direction. Because the material constituting the first conductor portion 11 and the second conductor portion 21 is, for example, a braid, the above-described step can be performed manually.

[0036] 10 , a first through hole H1 and a second through hole H2 are formed in the surface 21s1 of the second conductor portion 21. By widening the mesh of the second conductor portion 21, the first through hole H1 and the second through hole H2 that communicate with the internal space V from the outside of the second conductor portion 21 are formed.

[0037] Next, a step (S4) is performed in which the first conductor portion 11 is extended from the first through hole H1 through the internal space V to the second through hole H2. In this step (S4), as shown in FIG. 11 , the first conductor portion 11 is extended from the first through hole H1 through the internal space V to the second through hole H2. Note that the area indicated by the dotted line in FIG. 11 corresponds to a portion 1c of the first conductor portion 1 disposed within the internal space V. Next, one end and the other end of the second conductor portion 21 expanded in the short-side direction are pulled in the direction of the central axis A. By doing so, the first conductor portion 1 and the second conductor portion 21 are brought into close contact with each other, as shown in FIG. 12 .

[0038] Next, a step (S5) is performed to cover the second conductor portion 21 with the second insulating portion 22. In this step (S5), the surface 21s1 of the second conductor portion 21 is covered with the second insulating portion 22, as shown in FIG.

[0039] Next, a step (S6) is performed in which terminals 3 are connected to both ends of each of first conductor portion 11 and second conductor portion 21. In this step (S6), terminals 3 are connected to one end and the other end of each of first conductor portion 1 and second conductor portion 2 by crimping. Terminals 3 are connected to first conductor portion 1 and second conductor portion 2 by crimping. In this manner, coaxial cable 100a shown in FIGS. 1 to 5 is manufactured.

[0040] Conventionally, coaxial cables are manufactured using large equipment such as an extruder, but the above manufacturing method allows the coaxial cable 100a to be manufactured manually while suppressing heat generation, thereby providing the coaxial cable 100a according to the first embodiment, which is easy to manufacture.

[0041] <Operation and Effect> The coaxial cable 100a according to the present disclosure includes a first conductor portion 1 and a second conductor portion 2. The first conductor portion 1 has an internal space V. The first conductor portion 1 extends along a central axis A. The first conductor portion 1 includes a first conductor portion 11 and a first insulating portion 12. The first insulating portion 12 covers a surface 11s of the first conductor portion 11. A first through hole H1 is formed on a side surface 20s of the second conductor portion 2 that surrounds the central axis A. The first conductor portion 1 is inserted into the internal space V through the first through hole H1.

[0042] In this way, the emission of electromagnetic noise to the outside of the coaxial cable 100a is suppressed because the part 1c of the first conductor 1 is inserted into the internal space V of the second conductor 2. Furthermore, the coaxial cable 100a can be easily manufactured manually without using large-scale equipment.

[0043] In the coaxial cable 100a, a second through hole H2 is formed on the side surface 20s of the second conductor portion 2. The first conductor portion 1 has one end 1l and the other end 1r. The one end 1l is located outside the second conductor portion 2 from the first through hole H1. The other end 1r is located on the opposite side of the one end 1l. The other end 1r extends to the outside of the second conductor portion 2 through the second through hole H2.

[0044] In this way, the emission of electromagnetic noise to the outside of the coaxial cable 100a is suppressed because the part 1c of the first conductor 1 is inserted into the internal space V of the second conductor 2. Furthermore, the coaxial cable 100a can be easily manufactured manually without using large-scale equipment.

[0045] In the coaxial cable 100a, the second conductor section 2 includes a second conductor portion 21 and a second insulating portion 22. The second insulating portion 22 covers the second conductor portion 21. In this manner, the second conductor portion 21 is insulated from the surroundings.

[0046] In the coaxial cable 100a, the material constituting the second conductor portion 21 is a braided body. In this way, the coaxial cable 100a can be easily manufactured manually without using a large-scale device.

[0047] In the coaxial cable 100a, the material constituting the first conductor portion 11 is a braid. This reduces the number of components, thereby reducing the cost of manufacturing the coaxial cable 100a.

[0048] In the coaxial cable 100a, the first conductor 1 and the second conductor 2 are flat in shape, which can suppress heat generation in the coaxial cable 100a due to the proximity effect.

[0049] A manufacturing method of the coaxial cable 100a according to the present disclosure includes a step (S1) of preparing a first conductor portion 11 and a second conductor portion 21 having an internal space V, a step (S2) of covering the first conductor portion 11 with a first insulating portion 12, a step (S3) of forming a first through hole H1 and a second through hole H2 in the second conductor portion 21, a step (S4) of extending the first conductor portion 11 from the first through hole H1 through the internal space V to the second through hole H2, and a step (S5) of covering the second conductor portion 21 with a second insulating portion 22.

[0050] In this way, the emission of electromagnetic noise to the outside of the coaxial cable 100a is suppressed because the part 1c of the first conductor 1 is inserted into the internal space V of the second conductor 2. Furthermore, the coaxial cable 100a can be easily manufactured manually without using large-scale equipment.

[0051] The method for manufacturing the coaxial cable 100a includes a step (S6) of connecting terminals 3 to both ends of each of the first conductor portion 11 and the second conductor portion 21.

[0052] In this way, the emission of electromagnetic noise to the outside of the coaxial cable 100a is suppressed because the part 1c of the first conductor 1 is inserted into the internal space V of the second conductor 2. Furthermore, the coaxial cable 100a can be easily manufactured manually without using large-scale equipment.

[0053] Second Embodiment <Configuration of Coaxial Cable> Fig. 14 is a schematic perspective view of a coaxial cable 100b according to the second embodiment. Fig. 14 corresponds to Fig. 1. Fig. 15 is a schematic cross-sectional view of the coaxial cable 100b according to the second embodiment. Fig. 15 corresponds to Fig. 3. The coaxial cable 100b shown in Figs. 14 and 15 basically has the same configuration as the coaxial cable 100a shown in Figs. 1 to 5 and can achieve the same effects, but differs in that two terminals 32b are connected to the other end of the second conductor portion 2. In the coaxial cable 100b according to the second embodiment, the second through hole H2 is not formed on the side surface 20s of the second conductor portion 2.

[0054] As described above, the second conductor portion 21 is a cylindrical conductor with both ends open. That is, the second conductor portion 2 has an opening at the other end. The other end 1r of the first conductor portion 1 is exposed to the outside through the opening. As shown in FIG. 15 , the other end of the second conductor portion 21 is branched into two. For example, two notches are made from the opening at the other end along both side surfaces of the first conductor portion 1. As a result, the other end of the second conductor portion 21 can be branched into a portion located above the first conductor portion 1 and a portion located below the first conductor portion 1. Terminals 32b are connected to each of the two branched second conductor portions 21. That is, two terminals 32b are connected to the end of the second conductor portion 2 opposite the side where the first through hole H1 is formed in the direction of the central axis A. As shown in FIG. 15 , the two terminals 32b are arranged to sandwich the terminal 31b.

[0055] In this way, the coaxial cable 100b can be used as a module that converts the two terminals into three terminals.

[0056] <Effects> In the coaxial cable 100b, two terminals 32b are connected to the end of the second conductor portion 2 on the side opposite to the side where the first through hole H1 is formed in the direction of the central axis A. In this way, the coaxial cable 100b can be used as a module that converts two terminals into three terminals.

[0057] The embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. Unless there is a contradiction, at least two of the embodiments disclosed herein may be combined. The basic scope of the present disclosure is defined by the claims, not the above description, and is intended to include all modifications within the meaning and scope of the claims.

[0058] Various aspects of the present disclosure are described below as appendices. (Appendix 1) A coaxial cable comprising: a first conductor; and a second conductor having an internal space and extending along a central axis, wherein the first conductor includes a first conductor portion and a first insulating portion covering a surface of the first conductor portion, wherein a first through hole is formed in the second conductor portion on a side surface surrounding the central axis, and wherein the first conductor portion is inserted into the internal space through the first through hole. (Appendix 2) A coaxial cable according to Appendix 1, wherein a second through hole is formed in the side surface of the second conductor, and wherein the first conductor portion has one end located outside the second conductor portion from the first through hole and another end located opposite to the one end, and wherein the other end extends outside the second conductor portion through the second through hole. (Supplementary Note 3) The coaxial cable according to Supplementary Note 1 or Supplementary Note 2, wherein the second conductor portion includes a second conductor portion and a second insulating portion, and the second insulating portion covers the second conductor portion. (Supplementary Note 4) The coaxial cable according to Supplementary Note 2 or Supplementary Note 3, wherein the material constituting the second conductor portion is a braid. (Supplementary Note 5) The coaxial cable according to any one of Supplementary Note 1 to Supplementary Note 4, wherein the material constituting the first conductor portion is a braid. (Supplementary Note 6) The coaxial cable according to Supplementary Note 1, wherein two terminals are connected to an end of the second conductor portion on the side opposite to the side on which the first through hole is formed in the central axis direction. (Supplementary Note 7) The coaxial cable according to any one of Supplementary Note 1 to Supplementary Note 6, wherein the first conductor portion and the second conductor portion have flat shapes. (Supplementary Note 8) A method for manufacturing a coaxial cable, comprising the steps of: preparing a first conductor portion and a second conductor portion having an internal space; covering the first conductor portion with a first insulating portion; forming a first through hole and a second through hole in the second conductor portion; extending the first conductor portion from the first through hole through the internal space to the second through hole; and covering the second conductor portion with the second insulating portion. (Supplementary Note 9) A method for manufacturing a coaxial cable according to Supplementary Note 8, comprising the step of connecting terminals to both ends of each of the first conductor portion and the second conductor portion.

[0059] 1 first conductor portion, 1c part, 1l one end, 1r other end, 2 second conductor portion, 3, 31a, 31b, 32a, 32b terminal, 11 first conductor portion, 11s, 21s1 surface, 12 first insulating portion, 20s side surface, 21 second conductor portion, 21s2 inner surface, 22 second insulating portion, 24 opening, 100a, 100b coaxial cable, A central axis, H1 first through hole, H2 second through hole, V internal space, b1, b2 magnetic flux, h terminal hole.

Claims

1. A coaxial cable comprising: a first conductor portion; and a second conductor portion having an internal space and extending along a central axis, said first conductor portion including a first conductor portion and a first insulating portion covering a surface of said first conductor portion, said second conductor portion having a first through hole formed on a side surface surrounding said central axis, and said first conductor portion being inserted into said internal space through said first through hole.

2. A coaxial cable as described in claim 1, wherein a second through hole is formed on the side surface of the second conductor portion, and the first conductor portion has one end located from the first through hole to the outside of the second conductor portion and another end located opposite the one end, and the other end extends to the outside of the second conductor portion through the second through hole.

3. A coaxial cable as described in claim 2, wherein the second conductor portion includes a second conductor portion and a second insulating portion, and the second insulating portion covers the second conductor portion.

4. The coaxial cable according to claim 3, wherein the material constituting the second conductor portion is a braid.

5. The coaxial cable according to claim 4, wherein the material constituting said first conductor portion is a braid.

6. A coaxial cable as described in claim 1, wherein two terminals are connected to an end of the second conductor portion on the side opposite to the side on which the first through hole is formed in the central axis direction.

7. A coaxial cable according to any one of claims 1 to 6, wherein the first conductor portion and the second conductor portion are flat in shape.

8. A method for manufacturing a coaxial cable, comprising the steps of: preparing a first conductor portion and a second conductor portion having an internal space; covering the first conductor portion with a first insulating portion; forming a first through hole and a second through hole in the second conductor portion; extending the first conductor portion from the first through hole through the internal space to the second through hole; and covering the second conductor portion with a second insulating portion.

9. A method for manufacturing a coaxial cable according to claim 8, further comprising the step of connecting terminals to both ends of each of said first conductor portion and said second conductor portion.