JP2021140943A - Noise-reduced cable - Google Patents

Abstract

To provide a noise-reduced cable that can achieve noise reduction and has improved bendability and flexibility.SOLUTION: A noise-reduced cable has a magnetic layer that surrounds the periphery of a structure such as a conductive wire and an insulating layer. The magnetic layer has a plurality of magnetic wires 16a (a plurality of magnetic wires 16b), and the plurality of magnetic wires 16a (plurality of magnetic wires 16b) each include a fiber 17 and a magnetic tape 13 spirally wound around the fiber 17.SELECTED DRAWING: Figure 7

Description

The present invention relates to a noise suppression cable, and more particularly to a noise suppression cable provided with a magnetic layer.

As a cable such as a signal transmission cable, a cable including a conductive wire and an insulating layer covering the outer periphery of the conductive wire is known. Here, since the electromagnetic wave radiated from the conductive wire becomes noise, a noise suppression cable capable of suppressing the noise by providing a magnetic layer made of a magnetic tape or a magnetic plating layer on the outer periphery of the insulating layer has been developed. There is.

For example, Patent Document 1 describes a noise suppression cable including a conductive wire, an insulating layer covering the outer periphery of the conductive wire, and two magnetic tape layers wound around the outer periphery of the insulating layer in opposite directions. Is disclosed.

Further, Patent Document 2 discloses a technique for forming a magnetic tape by cutting out a rolled material made of a magnetic material and attaching a plurality of cut out rolled material pieces to a resin tape. Further, Patent Document 2 also discloses that the width direction of the magnetic tape matches the rolling direction of the rolled material.

Further, Patent Document 3 discloses a technique in which a shield layer is formed of a strip-shaped iron foil and a strip-shaped copper foil woven into a braided shape. Further, the strip-shaped iron foil and the strip-shaped copper foil are formed by winding the iron foil and the copper foil around the cotton thread, respectively.

JP-A-2015-153734 JP-A-2015-198040 Japanese Unexamined Patent Publication No. 6-60730

Noise suppression cables with a magnetic layer are used as cables for various purposes. For example, when noise suppression cables are used in parts where frequent rotation and / or bending movements are performed, such as moving parts of robots. , Noise suppression cables are required to have high flexibility and flexibility. Therefore, when the structure constituting the magnetic layer is hard, there is a problem that it is difficult to route the noise suppression cable.

Therefore, it is desired to develop a noise suppression cable that can suppress noise and has improved flexibility and flexibility.

Other objectives and novel features will become apparent from the description and accompanying drawings herein.

The noise suppression cable according to the embodiment includes a conductive wire, at least one insulating core having a first insulating layer covering the outer periphery of the conductive wire, and a shield layer covering the outer periphery of the insulating core.
A magnetic layer that covers the outer periphery of the shield layer is provided. Here, the magnetic layer has a plurality of magnetic wires wound around the outer periphery of the shield layer, and each of the plurality of magnetic wires is spirally wound around the first fiber and the outer periphery of the first fiber. Includes magnetic tape.

According to one embodiment, it is possible to provide a noise suppression cable capable of suppressing noise and having improved flexibility and flexibility.

It is a perspective view which shows the noise suppression cable in Embodiment 1. FIG. It is sectional drawing which shows the noise suppression cable in Embodiment 1. FIG. It is a top view which shows the manufacturing method of the magnetic wire in Embodiment 1. FIG. It is a top view which shows the manufacturing method of the magnetic wire in Embodiment 1. FIG. It is sectional drawing which shows the manufacturing method of the magnetic wire in Embodiment 1. FIG. It is sectional drawing which shows the manufacturing method of the magnetic wire in Embodiment 1. FIG. It is a side view which shows the manufacturing method of the magnetic wire in Embodiment 1. FIG. It is a side view which shows the bundle composed of a plurality of magnetic wires in Embodiment 1. FIG. It is a side view which shows the magnetic layer in Embodiment 1. FIG. It is a side view which shows the magnetic layer in Embodiment 2. FIG. FIG. 10 is an enlarged view of a main part of the magnetic layer in FIG. It is a side view which shows the magnetic layer in Embodiment 3. FIG. It is a perspective view which shows the noise suppression cable in the modification.

Hereinafter, embodiments will be described in detail with reference to the drawings. In all the drawings for explaining the embodiment, the members having the same function are designated by the same reference numerals, and the repeated description thereof will be omitted. Further, in the following embodiments, the description of the same or similar parts is not repeated in principle except when it is particularly necessary.

Further, in the drawings for explaining the embodiments, hatching may be added or omitted in order to make the configuration easy to understand.

(Embodiment 1)
<Configuration of noise suppression cable 1>
The noise suppression cable 1 according to the first embodiment will be described below with reference to FIGS. 1 and 2. FIG. 1 is a perspective view showing a noise suppression cable 1. FIG. 2 is a cross-sectional view of the noise suppression cable 1 and is a cross-sectional view perpendicular to the extending direction of the noise suppression cable 1.

As shown in FIGS. 1 and 2, the noise suppression cable 1 includes a conductive wire 2, an insulating layer 3 covering the outer periphery of the conductive wire 2, a shield layer 4 covering the outer periphery of the insulating layer 3, and a shield layer 4. An insulating layer 5 that covers the outer periphery, a magnetic layer 6 that covers the outer periphery of the insulating layer 5, and a jacket 7 that covers the outer periphery of the magnetic layer 6 are provided.

The noise suppression cable 1 in the first embodiment is a coaxial cable for transmitting an electric signal, and is used for various electric devices used in, for example, wireless communication, broadcasting, a network, electronic measurement, or a robot. When the noise suppression cable 1 is used, electromagnetic waves and the like are radiated as noise from the conductive wire 2, but the radiation of the noise is suppressed by the magnetic layer 6 that covers the outer periphery of the conductive wire 2.

In the present specification, when an expression such as "insulating layer 3 covering the outer periphery of the conductive wire 2" is used, it means that the insulating layer 3 is located around the conductive wire 2 and is conductive. Including the case where the wire 2 and the insulating layer 3 are in direct contact with each other, the conductive wire 2 and the insulating layer 3 are in the above space in a state where a space or another structure exists between the conductive wire 2 and the insulating layer 3. Alternatively, the case where they are adjacent to each other via the above other structures is also included. Such a definition is not limited to the relationship between the conductive wire 2 and the insulating layer 3, but also applies to the relationship between other structures such as the insulating layer 5 and the magnetic layer 6. Further, as in the case of "magnetic layer 6 covering the outer periphery of the insulating layer 3," the magnetic layer 6 may represent a state of covering the outer periphery of the insulating layer 3 via the shield layer 4 and the insulating layer 5.

The conductive wire 2 is a single wire made of a metal material such as copper or a copper alloy, and the outer diameter of the conductive wire 2 is, for example, 0.25 mm to 2.15 mm. Further, a plating layer made of a metal material such as tin or nickel may be formed on the surface of the conductive wire 2. The metal material constituting the conductive wire 2 may be aluminum or an aluminum alloy, or is a metal-plated fiber in which the outer periphery of a resin fiber such as polyethylene, polypropylene or fluororesin is covered with a metal-plated layer such as copper. You may.

Further, the noise suppression cable 1 according to the first embodiment may include a plurality of conductive wires 2 such as 7, 12, 19, or 37 wires. In that case, one of the plurality of conductive wires 2 becomes a core wire, and the other conductive wire 2 is twisted around the outer circumference of the core wire. That is, the plurality of conductive wires 2 may form a concentric stranded wire having one of them as a core wire.

The insulating layer (first insulating layer) 3 is made of a resin material such as polyethylene, polypropylene or fluororesin, and is formed by, for example, an extrusion molding technique using an extruder. The insulating layer 3 may be made of a foamable resin material such as polyethylene foam or polypropylene foam. The outer diameter of the insulating layer 3 is, for example, 0.26 mm to 2.87 mm.

The conductive wire 2 and the insulating layer 3 form an insulating core (insulated electric wire) IC. Here, a case where the noise suppression cable 1 is a coaxial cable and includes one insulating core IC will be illustrated. However, the noise suppression cable 1 may include at least one insulating core IC, and may include a plurality of insulating core ICs.

The shield layer 4 is made of a non-magnetic metal, for example, a plating layer mainly composed of copper (non-magnetic metal plating layer), and is formed by using a fieldless plating method and an electric field plating method. The shield layer 4 may be composed of a plating layer mainly composed of brass, which can obtain a higher rust preventive effect than copper. The outer diameter of the shield layer 4 is, for example, 2.1 mm to 14.1 mm.

Further, in the shield layer 4, instead of the plating layer, a non-magnetic metal wire made of a non-magnetic metal material such as copper or brass, or a non-magnetic metal foil thread such as a copper foil thread is used as an insulating layer 3. It may be configured by winding it in a horizontal winding shape or a braided shape around the outer circumference of the metal.

Further, when the noise suppression cable 1 is used, the shield layer 4 is electrically connected to a power source provided outside the noise suppression cable 1, and a ground potential (reference potential) is applied to the shield layer 4.

The insulating layer (second insulating layer) 5 is made of a resin material such as polyethylene, polypropylene or fluororesin, and is formed by, for example, an extrusion molding technique using an extruder. The insulating layer 5 may be made of a foamable resin material such as polyethylene foam or polypropylene foam. The outer diameter of the insulating layer 5 is, for example, 2.2 mm to 14.2 mm.

The jacket 7 is made of a resin material such as polyethylene, polypropylene, vinyl chloride, silicone rubber or fluororesin, and is formed by, for example, an extrusion molding technique using an extruder. The outer diameter of the jacket 7 is, for example, 3.2 mm to 15.2 mm.

The magnetic layer 6 has a plurality of magnetic wires located between the insulating layer 5 and the jacket 7 and wound around the outer periphery of the insulating layer 5. The main feature of the first embodiment is that the magnetic layer 6 is composed of a plurality of magnetic wires. Hereinafter, the detailed structure of the magnetic wire will be described first based on the manufacturing method thereof, and then the magnetic layer 6 formed by using the plurality of magnetic wires will be described.

In the present specification, when an expression such as "a plurality of magnetic wires wound around the outer circumference of the insulating layer 5" is used, it is expressed as "an insulating layer 3 covering the outer circumference of the conductive wire 2". The same definition as in the case of is applied. For example, it represents a state in which a plurality of magnetic wires are wound around the outer periphery of the insulating layer 3 via the shield layer 4 and the insulating layer 5, such as "a plurality of magnetic wires wound around the outer periphery of the insulating layer 3". In some cases.

<Manufacturing method of magnetic wire 16a and magnetic wire 16b and their structure>
The method for manufacturing the magnetic wire 16a and the magnetic wire 16b according to the first embodiment will be described below with reference to FIGS. 3 to 7. FIG. 3 is a plan view showing the rolled material 11. FIG. 4 is a plan view showing the magnetic tape 13. 5 and 6 are cross-sectional views showing the magnetic tape 13. FIG. 7 is a side view showing the plurality of magnetic wires 16a and the plurality of magnetic wires 16b, and is a side view along the extending direction of the fiber 17.

First, as shown in FIG. 3, a strip-shaped rolled material 11 rolled in a predetermined direction is prepared. The rolled material 11 is a magnetic material, preferably made of a soft magnetic material having a small holding force and a large magnetic permeability. The soft magnetic material is, for example, an amorphous alloy such as a Co-based amorphous alloy or an Fe-based amorphous alloy, or a ferrite such as Mn-Zn-based ferrite, Ni-Zn-based ferrite, or Ni-Zn-Cu-based ferrite. It is a soft magnetic metal such as Fe—Ni based alloy (Permalloy), Fe—Si—Al based alloy (Sendust) or Fe—Si based alloy (silicon steel).

The plurality of arrows shown in the rolled material 11 in FIG. 3 indicate the rolling direction of the rolled material 11. Further, also in the drawings after FIG. 3, a plurality of arrows indicating the rolling direction may be shown on the magnetic material piece 11a, the magnetic tape 13, the magnetic wire 16a, and the magnetic wire 16b.

The rolled material 11 is cut out along the cutting line 12. The plurality of pieces cut out from the rolled material 11 become a plurality of magnetic material pieces 11a. The direction of the cutting line 12 is orthogonal to the rolling direction.

Next, as shown in FIGS. 4 and 5, a resin film (resin tape) 14 extending in a predetermined direction is prepared. The resin film 14 is made of a resin material such as polyethylene terephthalate or polypropylene. Next, the resin film 14 and the plurality of magnetic material pieces 11a are attached by attaching the plurality of magnetic material pieces 11a to the resin film 14 with an adhesive along the extending direction (first direction) of the resin film 14. The included magnetic tape 13 is formed. The magnetic tape 13 is wound around the fiber 17 described later. In that case, as shown in FIG. 5, the plurality of magnetic material pieces 11a are on the inside and the resin film 14 is on the outside. It is preferable that the magnetic material pieces 11a are attached to the resin film 14 so that the gaps between the magnetic material pieces 11a are as small as possible (ideally, the gaps are zero).

Further, the width of the resin film 14 corresponds to the width of the magnetic tape 13. The width W1 of the magnetic tape 13 and the resin film 14 shown in FIG. 4 substantially matches the dimensions of the plurality of magnetic material pieces 11a cut out from the rolled material 11. The thickness of the magnetic piece 11a is, for example, 0.01 mm to 0.05 mm, and the thickness of the resin film 14 is, for example, 0.01 mm to 0.05 mm. After attaching the plurality of magnetic material pieces 11a to the resin film 14, the width W1 of the resin film 14 and the plurality of magnetic material pieces 11a are formed by cutting both end portions of the magnetic tape 13 along the first direction. The dimensions may be matched.

Further, the extending direction of the magnetic tape 13 is the same as the extending direction of the resin film 14, and the width direction (second direction) of the magnetic tape 13 and the resin film 14 is the extending direction of the magnetic tape 13 or the resin film 14. The direction is orthogonal to the direction (first direction). Here, each of the plurality of magnetic material pieces 11a is attached to the resin film 14 so that the width direction of the magnetic tape 13 and the resin film 14 is the rolling direction of the rolling material 11. That is, the rolling directions of the plurality of magnetic material pieces 11a are the same, and are the same as the width directions of the magnetic tape 13 and the resin film 14.

Further, FIG. 6 is a modification of FIG. As shown in FIG. 6, the magnetic tape 13 may further include a resin film (resin tape) 15. That is, the magnetic tape 13 may be a structure in which a plurality of magnetic material pieces 11a are sandwiched between the resin film 14 and the resin film 15. The material constituting the resin film 15 is the same as the material constituting the resin film 14, and each dimension such as the thickness and width of the resin film 15 is the same as each dimension of the resin film 14.

In the case of the structure of FIG. 6, since the plurality of magnetic material pieces 11a are sandwiched between the resin film 14 and the resin film 15, the adhesion between the plurality of magnetic material pieces 11a and the resin film is improved as compared with FIG. Can be improved.

Next, as shown in FIG. 7, a fiber (first fiber) 17 extending in a predetermined direction is prepared. The fiber 17 is an insulating yarn, for example a chemical fiber such as polyester or nylon, or a natural fiber such as silk or cotton yarn.

By spirally winding the magnetic tape 13 around the outer periphery of the fiber 17, a magnetic wire (first magnetic wire) 16a and a magnetic wire (second magnetic wire) 16b including the fiber 17 and the magnetic tape 13 are formed. Here, the magnetic tape 13 is wound around the fiber 17 so that the plurality of magnetic material pieces 11a are on the inside and the resin film 14 is on the outside. That is, the plurality of magnetic material pieces 11a are located between the fiber 17 and the resin film 14.

Further, when the magnetic tape 13 further includes the resin film 15 as shown in FIG. 6, the resin film 15 is the innermost and is located between the fiber 17 and the plurality of magnetic material pieces 11a.

Further, although the magnetic tape 13 is wound around one fiber 17 here, a plurality of fibers 17 may be bundled and the magnetic tape 13 may be wound around the outer periphery of the bundled plurality of fibers 17.

Each of the magnetic tapes 13 of the magnetic wire 16a and the magnetic wire 16b is wound around the fiber 17 in opposite directions to each other. That is, the winding direction (first winding direction) R1 of the magnetic tape 13 of the magnetic wire 16a wound around the outer circumference of the fiber 17 is the winding direction (second winding direction) of the magnetic tape 13 of the magnetic wire 16b wound around the outer circumference of the fiber 17. Winding direction) The direction opposite to R2.

In other words, the magnetic tape 13 of the magnetic wire 16a is right-handed (Z-wound), and the magnetic tape 13 of the magnetic wire 16b is left-handed (S-wound). Here, the right-handed winding (Z-wound) means a winding method in which the fibers 17 are vertically installed from the bottom to the top and then wound from the lower left to the upper right. Left-handed (S-wound) means a winding method in which the fibers 17 are vertically installed from the bottom to the top and then wound from the lower right to the upper left. The magnetic tape 13 of the magnetic wire 16a may be left-handed (S-wound), and the magnetic tape 13 of the magnetic wire 16b may be right-handed (Z-wound).

As described above, in the two types of magnetic wires 16a and 16b, the winding directions of the magnetic tape 13 are opposite to each other, so that the rolling directions are opposite to each other. The outer diameters of the magnetic wire 16a and the magnetic wire 16b thus formed are, for example, 0.1 mm to 0.2 mm.

FIG. 8 is a side view showing a bundle 18a composed of a plurality of magnetic wires 16a and a bundle 18b composed of a plurality of magnetic wires 16b according to the first embodiment.

As shown in FIG. 8, a bundle (first bundle, third bundle) 18a is formed by bundling a plurality of magnetic wires 16a, and a bundle (second bundle, third bundle) is formed by bundling a plurality of magnetic wires 16b. ) 18b is configured. In other words, the bundle 18a is composed of a plurality of twisted magnetic wires 16a, and the bundle 18b is composed of a plurality of twisted magnetic wires 16b. Therefore, in the bundle 18a and the bundle 18b, the rolling directions are opposite to each other. The number of magnetic wires 16a or the number of magnetic wires 16b contained in the bundle 18a or the bundle 18b is not particularly limited and is appropriately designed.

<Structure of magnetic layer 6>
The magnetic layer 6 according to the first embodiment will be described in detail below with reference to FIG. FIG. 9 is a side view showing the magnetic layer 6 composed of the plurality of magnetic wires 16a or the plurality of magnetic wires 16b, and is a side view along the extending direction of the noise suppression cable 1.

In FIG. 9, the magnetic layer 6 is formed by spirally winding the bundle 18a (plurality of magnetic wires 16a) around the outer periphery of the insulating layer 5. Here, as the magnetic layer 6, instead of the bundle 18a in which the plurality of magnetic wires 16a are bundled, the bundle 18b in which the plurality of magnetic wires 16b are bundled may be applied.

As described above, each of the magnetic wire 16a and the magnetic wire 16b includes the magnetic tape 13, the magnetic tape 13 includes a plurality of magnetic material pieces 11a, and the rolling directions of the magnetic material pieces 11a are the same. Yes, it is the same direction as the width direction of the magnetic tape 13. The direction of the rolling direction intersects the extending direction of the noise suppression cable 1 (conductive wire 2 of the insulating core IC) so as to be 90 ° ± 10 °.

The winding angle of the magnetic tape 13 around the fiber 17 and the winding angle of the magnetic wire 16a around the insulating layer 5 may be adjusted so as to have such an intersection angle. For example, if the winding angle of the magnetic tape 13 with respect to the fiber 17 is 45 ° (see FIG. 7) and the winding angle of the magnetic wire 16a with respect to the insulating layer 5 is 45 ° (see FIG. 9), the rolling direction of the magnetic tape 13 is , Crosses at 90 ° with respect to the extending direction of the noise suppression cable 1 (conductive wire 2 of the insulating core IC).

Further, in each of the plurality of magnetic material pieces 11a, the magnetic permeability in the direction orthogonal to the rolling direction (extending direction of the magnetic tape 13) is larger than the magnetic permeability in the rolling direction (width direction of the magnetic tape 13). .. That is, each of the plurality of magnetic material pieces 11a has inductive magnetic anisotropy.

Here, there are cases where the directions of the plurality of magnetic material pieces 11a are rotated by 90 degrees and the width direction of the magnetic tape 13 is orthogonal to the rolling direction, and cases where the magnetic tape 13 is used as in the first embodiment. It is known that when the measurement using the coil is performed in the case where the width direction is the rolling direction, the inductance of the coil is higher in the latter case, and noise such as electromagnetic waves can be suppressed. For example, Patent Document 2 (Japanese Unexamined Patent Publication No. 2015-198040) discloses such a measurement result.

In the first embodiment, since the width direction of the magnetic tape 13 is the rolling direction, noise can be suppressed by the noise suppression cable 1 provided with such a magnetic layer 6.

Further, each of the plurality of magnetic wires 16a and the plurality of magnetic wires 16b is composed of a fiber 17 and a magnetic tape 13 wound around the outer periphery of the fiber 17. That is, by using the magnetic layer 6 containing the relatively soft fibers 17, the flexibility and flexibility of the noise suppression cable 1 are improved as compared with the case where the magnetic layer is composed only of the relatively hard magnetic material. be able to. Further, since the mass of the material constituting the fiber 17 is lighter than the mass of the material of the magnetic material, the weight of the noise suppression cable 1 can be reduced.

By the way, as described with reference to FIGS. 5 and 6, the magnetic tape 13 is wound around the outer periphery of the fiber 17 with the plurality of magnetic material pieces 11a on the inside and the resin film 14 on the outside. Therefore, the outer periphery of the magnetic wire 16a and the magnetic wire 16b is covered with an insulator. Therefore, even if the insulating layer 5 shown in FIGS. 1 and 2 is not provided, the insulating state is maintained between the shield layer 4 and the magnetic layer 6.

Therefore, as a modification of the first embodiment, the formation of the insulating layer 5 may be omitted, and the shield layer 4 and the magnetic layer 6 may be brought into direct contact with each other. That is, the plurality of magnetic wires 16a and the plurality of magnetic wires 16b may be wound around the outer periphery of the shield layer 4 so that the resin film 14 of the magnetic tape 13 is in direct contact with the shield layer 4. In that case, since the formation of the insulating layer 5 can be omitted, it is possible to suppress an increase in the manufacturing cost of the noise suppression cable 1 while ensuring the reliability of the noise suppression cable 1.

(Embodiment 2)
The noise suppression cable 1 according to the second embodiment will be described below with reference to FIGS. 10 and 11. In the following, the differences from the first embodiment will be mainly described. FIG. 10 is a side view showing the magnetic layer 6 composed of the plurality of magnetic wires 16a and the plurality of magnetic wires 16b, and is a side view along the extending direction of the noise suppression cable 1. FIG. 11 is an enlarged view of a main part of the magnetic layer 6 in FIG.

The second embodiment is different from the first embodiment in that the plurality of magnetic wires 16a and the plurality of magnetic wires 16b constituting the magnetic layer 6 are wound.

In FIG. 10, the bundle 18a (plurality of magnetic wires 16a) and the bundle 18b (plurality of magnetic wires 16b) are wound around the outer periphery of the insulating layer 5 while being woven alternately. That is, the magnetic layer 6 is formed by winding the bundle 18a and the bundle 18b around the outer periphery of the insulating layer 5 in a braided manner.

Here, as shown in FIG. 11, the orientations of the bundles 18a (plurality of magnetic wires 16a) and the bundles 18b (plurality of magnetic wires 16b) wound in a braided manner in the rolling direction are aligned. If the braided magnetic layer 6 is formed by using only one of the bundle 18a and the bundle 18b, the directions in the rolling direction are orthogonal to each other.

As described with reference to FIG. 7, the winding direction R1 of the magnetic wire 16a is opposite to the winding direction R2 of the magnetic wire 16b. Therefore, even when the bundle 18a and the bundle 18b are wound around the outer periphery of the insulating layer 5 in a braided manner, the rolling directions of the magnetic piece 11a can be aligned, and the same effect as that of the first embodiment can be obtained. can.

That is, also in the second embodiment, the direction of the rolling direction intersects the noise suppression cable 1 so as to be 90 ° ± 10 ° (range of 80 ° or more and 100 ° or less). Therefore, the noise suppression effect can be obtained as in the first embodiment.

(Embodiment 3)
The noise suppression cable 1 according to the third embodiment will be described below with reference to FIG. In the following, the differences from the second embodiment will be mainly described.

In the second embodiment, the plurality of magnetic wires 16a constituting the bundle 18a and the plurality of magnetic wires 16b forming the bundle 18b each contained a magnetic material. In the third embodiment, instead of the bundle 18a or the bundle 18b, a bundle 18c composed of a plurality of fibers containing no magnetic material is used.

As shown in FIG. 12, a bundle (fourth bundle) 18c is formed by bundling a plurality of fibers 17. In other words, the bundle 18c consists of a plurality of twisted fibers 17. The bundle 18c (plurality of fibers 17) is wound around the outer circumference of the insulating layer 5. For each of the plurality of fibers (second fibers) 17 constituting the bundle 18c, the same material as that applied to the fibers (first fibers) 17 included in the magnetic wire 16a and the magnetic wire 16b can be applied.

One of the bundle 18a or the bundle 18b and the bundle 18c are wound around the outer circumference of the insulating layer 5 while being woven alternately. That is, one of the bundle 18a or the bundle 18b and the bundle 18c are wound around the outer circumference of the insulating layer 5 in a braided manner to form the magnetic layer 6.

In the third embodiment, as compared with the second embodiment, the noise suppression effect is reduced by the amount of the magnetic material, but the noise suppression effect is contained because a large amount of fibers 17 which are relatively soft materials are contained. The flexibility and flexibility of the cable 1 can be improved. Further, since the mass of the material constituting the fiber 17 is lighter than the mass of the material of the magnetic material, the weight of the noise suppression cable 1 can be reduced. Therefore, when the influence of noise is within the permissible range and higher flexibility and flexibility are required, the noise suppression cable 1 according to the third embodiment can be effectively used.

Although the present invention has been specifically described above based on the embodiments, the present invention is not limited to the above embodiments and can be variously modified without departing from the gist thereof.

For example, in the above embodiment, the case where the noise suppression cable 1 is a coaxial cable and the number of insulating core ICs composed of the conductive wire 2 and the insulating layer 3 is one has been illustrated, but the noise suppression cable 1 has a plurality of cables. An insulating core IC may be provided. FIG. 13 is a perspective view showing the noise suppression cable 1 in the modified example. Here, a twisted core formed by twisting three insulating core ICs is illustrated. The twisting pitch can be, for example, 20 mm to 50 mm.

Also in FIG. 13, the direction of the rolling direction is 90 ° ± 10 ° (range of 80 ° or more and 100 ° or less) with respect to the extending direction of the noise suppression cable (extending direction of each conductive wire 2 of the twisted core). The twist angle (twisting pitch) of the twisted core and the winding angle of the magnetic tape 13 with respect to the fiber 17 are adjusted so as to intersect with each other. Therefore, as in the first embodiment, the noise can be suppressed by the noise suppression cable 1 provided with the twisted core.

1 Noise suppression cable 2 Conductive wire 3 Insulation layer (first insulation layer)
4 Shield layer 5 Insulation layer (second insulation layer)
6 Magnetic layer 7 Jacket 11 Rolled material 11a Magnetic material piece 12 Cutting line 13 Magnetic tape 14 Resin film 15 Resin film 16a Magnetic wire (first magnetic wire)
16b magnetic wire (second magnetic wire)
17 fibers (first fiber, second fiber)
18a bundle (1st bundle, 3rd bundle)
18b bundle (2nd bundle, 3rd bundle)
18c bundle (4th bundle)
IC insulation core R1 winding direction (first winding direction)
R2 winding direction (second winding direction)
W1 width

Claims (11)

A conductive wire and at least one insulating core having a first insulating layer covering the outer periphery of the conductive wire,
A shield layer that covers the outer circumference of the insulating core and
A magnetic layer that covers the outer circumference of the shield layer and
With
The magnetic layer has a plurality of magnetic wires wound around the outer periphery of the shield layer.
Each of the plurality of magnetic wires is a noise suppression cable including a first fiber and a magnetic tape spirally wound around the outer periphery of the first fiber. In the noise suppression cable according to claim 1,
The magnetic tape is a noise suppression cable including a resin film extending in the first direction and a plurality of magnetic material pieces attached to the resin film along the first direction. In the noise suppression cable according to claim 2,
A noise suppression cable in which each of the plurality of magnetic material pieces is located between the first fiber and the resin film. In the noise suppression cable according to claim 3,
A noise suppression cable in which the plurality of magnetic wires are wound around the outer periphery of the shield layer so that the resin film is in direct contact with the shield layer. In the noise suppression cable according to claim 1,
A second insulating layer that covers the outer periphery of the shield layer is further provided.
The magnetic layer covers the outer periphery of the second insulating layer.
A noise suppression cable in which the plurality of magnetic wires are wound around the outer periphery of the second insulating layer. In the noise suppression cable according to any one of claims 2 to 4.
Each of the plurality of magnetic material pieces is a piece cut out from a rolled material which is a magnetic material.
Each of the plurality of magnetic material pieces is attached to the resin film so that the second direction orthogonal to the first direction and the width direction of the magnetic tape is the rolling direction of the rolling material. Attached noise suppression cable. In the noise suppression cable according to claim 6,
A noise suppression cable in which the extending direction of the noise suppression cable and the rolling direction of the rolled material intersect in a range of 80 ° or more and 100 ° or less. In the noise suppression cable according to claim 7,
A noise suppression cable in which the magnetic permeability of each of the plurality of magnetic material pieces in the first direction is different from the magnetic permeability of each of the plurality of magnetic material pieces in the second direction. In the noise suppression cable according to any one of claims 1 to 8.
A noise suppression cable in which the plurality of magnetic wires are spirally wound around the outer periphery of the shield layer. In the noise suppression cable according to any one of claims 1 to 8.
The plurality of magnetic wires include a plurality of first magnetic wires and a plurality of second magnetic wires.
The first winding direction of the magnetic tape of each of the plurality of first magnetic wires wound around the outer circumference of the first fiber is the direction of each of the plurality of second magnetic wires wound around the outer circumference of the first fiber. The direction is opposite to the second winding direction of the magnetic tape.
The first bundle is formed by bundling the plurality of first magnetic wires.
The second bundle is formed by bundling the plurality of second magnetic wires.
A noise suppression cable in which the first bundle and the second bundle are wound around the outer periphery of the shield layer in a braided manner. In the noise suppression cable according to any one of claims 1 to 8.
The magnetic layer further has a plurality of second fibers wound around the outer periphery of the shield layer.
A third bundle is formed by bundling the plurality of magnetic wires.
A fourth bundle is formed by bundling the plurality of second fibers.
A noise suppression cable in which the third bundle and the fourth bundle are wound around the outer periphery of the shield layer in a braided manner.

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