Cable

Abstract

To provide a cable capable of suppressing friction with other members.SOLUTION: A cable 1 comprises an assembly core 4 having a plurality of electric wires 2, a shield layer 6 covering the periphery of the assembly core 4, and a sheath 8 covering the periphery of the shield layer 6, where the shield layer 6 is made of a conductive tape 6a, the conductive tape 6a is wound such that a part thereof overlaps, and overlapped portions of the conductive tape 6a are fused, an outer tape member 7 wound on the periphery of the conductive tape 6a is provided between the conductive tape 6a and the sheath 8, and the outer tape member 7 and the conductive tape 6a are not fused.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a cable. [Background technology]

[0002] Conventionally, examples of cables wired to moving parts of devices such as industrial robots include cables that include an aggregate core formed by twisting together multiple electric wires (insulated electric wires, twisted pair wires formed by twisting pairs of insulated electric wires, etc.), a shielding layer (outer conductor) that covers the aggregate core, and a sheath that is provided around the shielding layer (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2019-240370 Summary of the Invention [Problem to be solved by the invention]

[0004] Cables used in industrial robots and machine tools, or in clean environments such as semiconductor manufacturing equipment, are required to have excellent abrasion resistance and bending resistance, as well as low dust generation. Conventional cables generally use a shielding layer made of metal wires, but shielding layers using metal braids are relatively heavy, which creates a problem of making the entire cable heavy. When the cable becomes heavy, it can rub strongly against other components around the cable, causing problems such as scraping off parts of the sheath.

[0005] Therefore, an object of the present invention is to provide a cable that can suppress friction with other components. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, the present invention provides a cable comprising: an aggregate core having a plurality of electric wires; a shielding layer surrounding the aggregate core; and a sheath surrounding the shielding layer, wherein the shielding layer is made of a conductive tape that is wound so that a portion of the conductive tape overlaps the other, and the overlapping portion of the conductive tape is fused; and an outer tape member is provided between the conductive tape and the sheath and wrapped around the conductive tape, and the outer tape member and the conductive tape are not fused together. [Effects of the Invention]

[0007] According to the present invention, a cable capable of suppressing friction with other components can be provided. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a cross-sectional view showing a cross section perpendicular to the longitudinal direction of a cable according to an embodiment of the present invention. [Figure 2] FIG. 10 is a diagram illustrating the restoring force of a cable. DETAILED DESCRIPTION OF THE INVENTION

[0009] [Embodiment Mode] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0010] (Overall configuration of cable 1) FIG. 1 is a cross-sectional view showing a cross section perpendicular to the longitudinal direction of cable 1 according to this embodiment. Cable 1 is used, for example, as internal wiring in equipment such as industrial robots, and is routed through moving parts that are repeatedly bent, twisted, swung, and the like (hereinafter referred to as bending and the like). Cable 1 may also be used, for example, in equipment such as semiconductor manufacturing equipment, and may be used in clean environments where dust generation is undesirable. Cable 1 may also be used as wiring for automobiles that are repeatedly swung (for example, wiring connecting a device provided on the vehicle body with a device provided on the wheels). Cable 1 may also be used, for example, as wiring for medical equipment or wiring to locations that come into contact with human skin.

[0011] As shown in Fig. 1, cable 1 includes an assembled core 4 made up of multiple electric wires 2, a shielding layer 6 that surrounds the assembled core 4, and a sheath 8 that surrounds the shielding layer 6. In this embodiment, a conductive tape 6a is used as the shielding layer 6, and tape members 5 and 7 are provided on the inner and outer sides of the shielding layer 6 in the cable radial direction. A drain wire 9 for grounding the conductive tape 6a is also provided. Each part will be described in detail below.

[0012] (Electric wire 2) The cable 1 has a plurality of twisted pair wires 20 as the plurality of electric wires 2. The twisted pair wires 20 are formed by twisting a pair of insulated electric wires 21 together. The insulated electric wires 21 have a conductor 21a made of a bunched twisted wire formed by bunching a plurality of metal wires together, and an insulator 21b covering the conductor 21a. The metal wires that make up the conductor 21a are made of copper or a copper alloy, and their surfaces may be plated with tin, silver, or the like. For example, the conductor 21a can be formed by bunching metal wires made of tin-plated annealed copper wires with an outer diameter of 0.05 mm or more and 0.13 mm or less. The outer diameter of the conductor 21a is, for example, 0.30 mm or more and 1.00 mm or less. The cross-sectional area of ​​the conductor 21a is, for example, 0.07 mm or less. 2 More than 0.60mm 2 The following is the result.

[0013] To improve the transmission characteristics of high-speed signals, the insulator 21b should preferably have a low dielectric constant (preferably, a dielectric constant of 3 or less). Examples of suitable materials include fluororesins such as ETFE (tetrafluoroethylene-ethylene copolymer), and resins such as polypropylene and polyethylene. In particular, when multiple electric wires 2 are used, a thin, moldable fluororesin such as ETFE can be used for the insulator 21b to prevent the cable 1 from becoming too large. However, in recent years, the use of fluororesins has been discouraged to reduce environmental impact, and from the perspective of reducing environmental impact, it is preferable to use a non-fluororesin. Furthermore, it is more preferable that the specific gravity of the insulator 21b be 1.0 or less. This reduces the weight of the electric wires 2 and the weight of the cable 1 itself, thereby further reducing friction between the cable 1 and surrounding components. Suitable non-fluororesins with a specific gravity of 1.0 or less include PP (polypropylene) and irradiation-crosslinked PP.

[0014] In order to suppress crosstalk between the twisted pairs 20, it is preferable to make the twist pitch of adjacent twisted pairs 20 different. The twist pitch of the twisted pairs 20 is the distance along the longitudinal direction of the twisted pairs 20 between points where the circumferential positions of any insulated electric wires 21 (the positions in the circumferential direction of the twisted pairs 20) are the same.

[0015] The electric wire 2 is not limited to the twisted pair wire 20. For example, the electric wire 2 may be configured as a single insulated electric wire 21, or may be a coaxial wire having an outer conductor and an outer sheath around the insulated electric wire 21.

[0016] The conductor pull-out force of the insulated wire 21 constituting the electric wire 2 is preferably 0.5 N / 25 mm or more and 3.0 N / 25 mm or less. The conductor pull-out force is the force (average value) when the conductor 21a is pulled out of the insulator 21b in the longitudinal direction at a constant speed (for example, a speed of 50 mm / min). This allows the conductor 21a to move relatively easily within the insulator 21b, thereby suppressing breakage due to stress concentration on some of the metal wires and improving resistance to bending and twisting. The conductor pull-out force can be adjusted by adjusting the manufacturing speed (wire speed) when the insulator 21b is extruded to form the insulator 21b or the temperature of the insulator 21b immediately after extrusion.

[0017] However, if the conductor pull-out force of the insulated wire 21 is reduced to 3.0 N / 25 mm or less, the conductor 21a becomes more likely to move relative to the insulator 21b, which may cause friction between the conductor 21a and the insulator 21b. To prevent breakage of the metal wires of the conductor 21a due to this friction and to improve resistance to bending and other operations, it is preferable to use an insulator 21b with high elongation. Specifically, it is preferable that the elongation of the insulator 21b be 500% or more.

[0018] In this embodiment, three electric wires 2 are twisted together, and nine electric wires 2 are twisted around them to form an assembled core 4 with a two-layer structure. Hereinafter, the electric wire 2 constituting the inner layer in the cable radial direction will be referred to as the first electric wire 2a, and the electric wire 2 constituting the outer layer will be referred to as the second electric wire 2b. In this embodiment, the first electric wire 2a and the second electric wire 2b have the same configuration, but the first electric wire 2a and the second electric wire 2b may have different configurations. For example, if the outer diameter and cross-sectional area of ​​the conductor 21a of the insulated electric wire 21 constituting the first electric wire 2a are smaller than the outer diameter and cross-sectional area of ​​the conductor 21a of the insulated electric wire 21 constituting the second electric wire 2b and the outer diameter and cross-sectional area of ​​the insulated electric wire 21 constituting the first electric wire 2a are smaller than the outer diameter and cross-sectional area of ​​the insulated electric wire 21 constituting the second electric wire 2b, when the cable 1 is subjected to an action such as bending, a larger tensile force will be applied to the second electric wire 2b, which is disposed further outward in the cable radial direction. Therefore, in this case, it is more preferable to make the conductor pull-out force of the insulated wire 21 constituting the second electric wire 2b greater than the conductor pull-out force of the insulated wire 21 constituting the first electric wire 2a. Also, in this case, it is more preferable to make the elongation of the insulator 21b of the insulated wire 21 constituting the second electric wire 2b greater than the elongation of the insulator 21b of the insulated wire 21 constituting the first electric wire 2a. For example, the elongation of the insulator 21b of the insulated wire 21 constituting the first electric wire 2a can be set to 790% or more, and the elongation of the insulator 21b of the insulated wire 21 constituting the second electric wire 2b can be set to 810% or more.

[0019] Note that when the outer diameter and cross-sectional area of ​​the conductor 21a of the insulated electric wire 21 constituting the first electric wire 2a are larger than those of the conductor 21a of the insulated electric wire 21 constituting the second electric wire 2b, and when the outer diameter and cross-sectional area of ​​the insulated electric wire 21 constituting the first electric wire 2a are larger than those of the insulated electric wire 21 constituting the second electric wire 2b, it is more preferable to make the conductor pull-out force of the insulated electric wire 21 constituting the second electric wire 2b smaller than that of the insulated electric wire 21 constituting the first electric wire 2a. This makes it possible to reduce the difference in the mobility of the conductor 21a of the insulated electric wire 21 constituting the first electric wire 2a and that of the insulated electric wire 21 constituting the second electric wire 2b when a tensile force is applied in the cable longitudinal direction. Therefore, when the cable 1 is repeatedly bent, for example, it is possible to suppress breakage due to stress concentration on the metal wires of the first electric wire 2a and the second electric wire 2b, and improve resistance to bending and twisting.

[0020] (Collective Core 4) In this embodiment, the collective core 4 is formed by twisting together 12 electric wires 2 (twisted pairs 20) and fiber fillers 3. Here, a two-layer structure is formed by twisting three electric wires 2 together and twisting nine electric wires 2 around them. The fiber fillers 3 are arranged between each electric wire 2 and serve to suppress abrasion between adjacent electric wires 2 when the cable 1 is repeatedly bent or otherwise subjected to bending or other operations. As the fiber fillers 3, for example, staple fiber yarn or a fibrous filler made of nylon or the like can be used. In particular, when a non-fluorine resin such as PP is used for the insulator 21b, it is desirable to use fiber fillers 3 with high cushioning properties such as staple fiber yarn and to space the electric wires 2 as far apart as possible in order to suppress breakage due to friction between the electric wires 2 and improve resistance to bending or the like.

[0021] Here, the collective core 4 is constructed using 12 electric wires 2, but the number of electric wires 2 used in the collective core 4 is not limited to this. Here, multiple electric wires 2 are arranged in two layers, but one layer or three or more layers may be used. Here, the collective core 4 is constructed by twisting multiple twisted pair wires 20, each formed by twisting a pair of insulated electric wires 21 together. Alternatively, the collective core 4 may be constructed by twisting multiple child twisted wires, each formed by twisting three or more insulated electric wires 21 together. Furthermore, the collective core 4 may include a linear body or tube made of resin. For example, the collective core 4 may be constructed by twisting multiple electric wires 2 around a linear body arranged in the center of the cable.

[0022] The twist direction of the twisted pairs 20 and the twist direction of the assembly core 4 are preferably different directions. If the twist direction of the twisted pairs 20 and the twist direction of the assembly core 4 were the same direction, the twist of the twisted pairs 20 would be strengthened by the twisting of the assembly core 4, making it more likely that the insulated wires 21 would break when the cable 1 is repeatedly bent or otherwise subjected to other operations. The twist direction of the twisted pairs 20 is the direction in which the insulated wires 21 rotate from one end to the other when viewed from one end of the twisted pairs 20. The twist direction of the assembly core 4 is the direction in which the wires 2 (twisted pairs 20) rotate from one end to the other when viewed from one end of the cable 1.

[0023] (Shield layer 6, and tape members 5, 7) The shielding layer 6 is composed of a conductive tape 6a having a substrate and a conductive layer made of conductive resin provided on the surface of the substrate. The conductive tape 6a is very thin and light. Therefore, the weight of the cable 1 can be reduced compared to when the shielding layer 6 is a braided shield using metal wires or a horizontally wound shield. By reducing the weight of the cable 1, it is possible to further reduce friction between the cable 1 and surrounding components. In addition, since the shielding layer 6 is thin and easy to bend, the cable 1 can be easily bent with a small bending radius. The conductive tape 6a is wound in a spiral shape so that parts of it overlap in the width direction.

[0024] The substrate of the conductive tape 6a is formed in a long strip shape and is made of a resin such as a polyolefin resin as a base resin. The substrate has a first surface and a second surface facing each other in a thickness direction perpendicular to the longitudinal direction of the substrate. The conductive layer is provided in a laminated state so as to cover at least one of the surfaces (first surface and second surface) of the substrate. The conductive layer is made of a conductive resin having a base resin such as a polyolefin resin in which conductive particles are dispersed. The base resins constituting the substrate and the conductive layer may contain additives such as a crosslinking agent, a crosslinking catalyst, an antioxidant, a plasticizer, a lubricant, a filler, a flame retardant, a stabilizer, and a colorant. The substrate may also be conductive.

[0025] The thickness of the conductive tape 6a is preferably 50 μm or more and 150 μm or less. More preferably, the thickness of the conductive tape 6a is 50 μm or more and 100 μm or less. When the overall thickness of the conductive tape 6a is 50 μm or more, the conductive tape 6a is less likely to break when the cable 1 is repeatedly bent or otherwise subjected to bending. Furthermore, when the overall thickness of the conductive tape 6a is 150 μm or less, the cable 1 can be made lightweight while maintaining flexibility. Furthermore, the thickness of the base material of the conductive tape 6a is preferably greater than the thickness of the conductive layer provided on one of the surfaces of the base material. For example, the thickness of the base material is preferably at least twice the thickness of the conductive layer. More preferably, the thickness of the base material is preferably at least two times and not more than three times the thickness of the conductive layer. When conductive layers are laminated on both surfaces of the base material, the thickness of the base material is preferably greater than the thickness of the conductive layer provided on one of the surfaces of the base material and greater than the total thickness of the conductive layers provided on both surfaces of the base material. In addition, in order to have good shielding performance (noise suppression effect) in the frequency band of 0.1 MHz to 100 MHz, the surface resistance of the conductive tape 6a is 1.0×10 6 Ω greater than 3.0×10 6 Ω or less, preferably 1.2×10 6 Ω or more 2.0×10 6 It is preferable that it is Ω or less.

[0026] In this embodiment, the conductive tape 6a is fused at a temperature of 150°C or higher and 200°C or lower. The heat generated during extrusion molding of the sheath 8 softens and fuses the overlapping portions of the conductive tape 6a, resulting in the conductive tape 6a becoming a hollow cylindrical shape as a whole. This increases the restoring force that causes the cable 1 to return to a straight shape when bent. For example, as shown in FIG. 2, when the cable 1 is wired in a U-shape, even if the opposing parallel portions of the cable 1 are pushed closer to each other, the cable 1 is likely to return to its original shape. Furthermore, because the cable 1 is lightweight and has high restoring ability, the cable 1 is less likely to sag, allowing it to maintain its wiring shape (to be self-supporting), and preventing interference with surrounding components due to the cable 1 sagging. Furthermore, the lighter weight of the cable 1 also reduces the load when the cable 1 is subjected to bending or other operations, significantly improving its resistance to bending and other operations.

[0027] In this embodiment, a conductive tape 6a is used, which has a base material made of polyethylene (PE) and conductive layers made of PE with carbon particles dispersed on both sides. By having conductive layers on both sides of the base material, when the tape is wound spirally so that part of the width of the tape overlaps, the conductive layers on the front and back sides come into contact with each other, forming a continuous conductive layer in the longitudinal direction, which contributes to improving electrical properties.

[0028] For example, instead of the conductive tape 6a, it is also possible to use a metal tape, such as a copper-PET tape, which is a resin tape made of PET (polyethylene terephthalate) with a copper layer formed on one side. However, if a metal tape is used instead of the conductive tape 6a, the metal tape's hardness can cause the edge of the metal tape to rub against the insulator 21b, resulting in abrasion of the insulator 21b when the cable 1 is repeatedly bent, which can significantly reduce the cable's resistance to bending and other operations. Furthermore, if a copper-plated tape, which is a copper-plated cloth-like material, is used instead of the conductive tape 6a, abrasion of the insulator 21b can be suppressed, but repeated bending and other operations can easily cause the copper plating to peel off, which can reduce the shielding performance and electrical characteristics. The conductive tape 6a has the softness (flexibility and pliability that allows it to flex flexibly when bent) of a tape material, making it easy to bend, lightweight, and capable of improving its resilience by fusing the overlapping portions to form a cylindrical shape. Therefore, it is suitable as the shielding layer 6 of the cable 1 disposed in a movable portion.

[0029] However, the conductive tape 6a softens due to heat generated when the sheath 8 is extruded. Therefore, if the sheath 8 is extruded directly onto the conductive tape 6a, the conductive tape 6a and the sheath 8 will be fused together. If the conductive tape 6a and the sheath 8 are fused together, the conductive tape 6a may not be able to follow the movement of the sheath 8 when the cable 1 is repeatedly bent, and the conductive tape 6a may be damaged. To prevent such a problem, an outer tape member 7 is provided between the conductive tape 6a and the sheath 8. The outer tape member 7 is spirally wrapped around the conductive tape 6a so that a portion of the outer tape member 7 overlaps with the conductive tape 6a in the width direction. The outer tape member 7 is made of, for example, a paper tape or a nonwoven fabric tape, and is not fused to the conductive tape 6a or the sheath 8.

[0030] Furthermore, if the conductive tape 6a were provided directly on the collective core 4, there is a risk that the conductive tape 6a would be fused to the electric wires 2 due to the heat generated when the sheath 8 is extruded. Therefore, in this embodiment, an inner tape member 5 is provided between the collective core 4 and the conductive tape 6a. The inner tape member 5 is wound spirally around the collective core 4 so that a portion of the inner tape member 5 overlaps with the collective core 4 in the width direction. The inner tape member 5, like the outer tape member 7, is made of, for example, paper tape or nonwoven tape, and is not fused to the conductive tape 6a or the electric wires 2 of the collective core 4.

[0031] It is preferable that the twisting direction of the collective core 4, the winding direction of the conductive tape 6a, the winding direction of the outer tape member 7, and the winding direction of the inner tape member 5 are all the same. This can further improve the durability when the cable 1 is subjected to bending or other operations. Note that the winding direction of the tape members (conductive tape 6a, outer tape member 7, and inner tape member 5) is the direction in which the tape members rotate from one end to the other end of the cable 1 when viewed from one end of the cable 1.

[0032] In FIG. 1, the inner tape member 5, the conductive tape 6a, and the outer tape member 7 are depicted in a circular shape, but the surfaces of the inner tape member 5, the conductive tape 6a, and the outer tape member 7 may have projections and recesses formed thereon in accordance with the twisted shape of the collective core 4.

[0033] (Drain wire 9) When using conductive tape 6a as the shielding layer 6, it is difficult to solder the conductive tape 6a directly to a substrate or the like. Therefore, it is preferable to provide a drain wire 9 for grounding the conductive tape 6a. The drain wire 9 is made of a stranded conductor formed by twisting together multiple metal wires. The metal wires constituting the drain wire 9 are made of copper or a copper alloy, and their surfaces may be plated with tin, silver, or the like. The drain wire 9 may be formed, for example, of a concentric strand formed by twisting together multiple metal wires made of tin-plated annealed copper wires with an outer diameter of 0.05 mm to 0.10 mm, or a bunched strand formed by bunching together multiple metal wires. The drain wire 9 is provided between the inner tape member 5 and the conductive tape 6a so as to contact the inner circumferential surface of the conductive tape 6a.

[0034] The drain wires 9 have a smaller outer diameter than the electric wires 2 and are arranged so as to enter the valleys between the electric wires 2 adjacent in the circumferential direction of the cable. The twisting direction and twisting pitch of the drain wires 9 are the same as those of the bundled core 4. This makes it easier for the drain wires 9 to enter the valleys between the electric wires 2 adjacent in the circumferential direction of the cable, thereby reducing the likelihood of unevenness on the surface of the conductive tape 6a. In particular, since the drain wires 9 are bundled stranded wires, the cross-sectional shape of the drain wires 9 can be deformed into a non-circular shape, such as an ellipse, and the drain wires 9 can easily enter the valleys between the electric wires 2 adjacent in the circumferential direction of the cable. This reduces the likelihood of unevenness on the surface of the conductive tape 6a, and reduces the likelihood of the cross-sectional shape of the cable 1 becoming distorted in the circumferential direction of the cable. When the cross-sectional shape of the cable 1 is less likely to become distorted, stress can be prevented from concentrating locally in distorted parts when the cable is repeatedly bent, twisted, or the like, and resistance to repeated bending, twisting, or the like is less likely to decrease.

[0035] (Sheath 8) The sheath 8 is provided to cover the periphery of the outer tape member 7. The sheath 8 is made of a resin composition primarily composed of, for example, PVC, silicone rubber, chlorinated polyethylene, or the like. For applications requiring chemical resistance or applications involving contact with human skin, a resin composition primarily composed of silicone rubber is preferably used. The resin composition may contain additives such as a crosslinking agent, a crosslinking catalyst, an antioxidant, a plasticizer, a lubricant, a filler, a flame retardant, a stabilizer, and a colorant. The surface of the sheath 8 may be provided with a coating to improve the slipperiness of the surface of the sheath 8. In particular, when the sheath 8 is made of a resin composition primarily composed of silicone rubber, a coating to improve the slipperiness of the surface may be provided. The coating provided on the surface of the sheath 8 may be, for example, a liquid silicone rubber containing fine particles with an average particle diameter of 1 μm to 10 μm, cured by addition reaction. The fine particles may be made of, for example, silicone rubber, silicone resin, or the like. The thickness of the coating is, for example, 3 μm or more and 100 μm or less. The static friction coefficient of the surface of the coating is 0.5 or less. In addition, it is preferable that the sheath 8 is separated from the underlying member by a small gap or the like. This makes it possible to prevent the sheath 8 from deteriorating due to friction with the underlying member caused by bending or other operations.

[0036] (Actions and Effects of the Embodiments) As described above, in the cable 1 according to this embodiment, the shielding layer 6 is formed by wrapping conductive tape 6a around the sheath 8 so that parts of the tape overlap, and the overlapping parts of the conductive tape 6a are fused. The outer tape member 7 is wound around the conductive tape 6a between the conductive tape 6a and the sheath 8, and the outer tape member 7 and the conductive tape 6a are not fused together.

[0037] By forming the shielding layer 6 using conductive tape 6a and fusing the overlapping portions of the conductive tape 6a to form a tubular shape, the cable 1 can be made lighter and have an improved restoring force to return the cable 1 to a straight shape when bent, compared to when the shielding layer 6 is formed using metal wires. As a result, the load applied to the cable 1 when it is bent or otherwise subjected to motion can be reduced, and sagging of the cable 1 due to its own weight can also be suppressed. Therefore, when the cable 1 is wired to a moving part of a device such as an industrial robot, the cable 1 can easily follow the movement of the moving part, reducing friction with other components and unintended interference with other components, thereby improving the cable 1's resistance to motion such as bending. Furthermore, according to this embodiment, the cable 1 can be made lighter, which facilitates transportation of the cable 1 and reduces transportation costs.

[0038] Furthermore, by interposing an outer tape member 7 made of a material that does not fuse to the conductive tape 6a between the conductive tape 6a and the sheath 8, it is possible to prevent the conductive tape 6a and the sheath 8 from fusing together due to the heat generated when the sheath 8 is extruded. This makes it possible to improve the cable 1's resistance to movements such as bending, even when the conductive tape 6a is used as the shielding layer 6.

[0039] Furthermore, if the shielding layer 6 is made of metal wires, it is necessary to form the shielding layer 6 on a dedicated manufacturing line. However, if the shielding layer 6 is made of conductive tape 6a, it is possible to perform the twisting of the collective core 4, the winding of the inner tape member 5, the winding of the conductive tape 6a, the winding of the outer tape member 7, and the formation of the sheath 8 all on a single manufacturing line, which makes it easier to manufacture the cable 1 and reduces manufacturing costs.

[0040] Furthermore, if the shielding layer 6 were made of metal wires, there would be a risk that if the metal wires were to break, the broken metal wires would break through the sheath 8 and protrude to the outside, or that the broken metal wires would pierce the electric wires 2 that make up the collective core 4. In contrast, in the present embodiment, the shielding layer 6 is made of conductive tape 6a, so even if the conductive tape 6a is damaged, there is no risk of damaging the sheath 8 or the electric wires 2. Furthermore, there is less deterioration in shielding performance when the shielding layer 6 is damaged compared to when the shielding layer 6 is made of metal wires. In recent years, the price of copper has been rising, so by making the shielding layer 6 out of conductive tape 6a, there is also the advantage that the amount of copper used can be reduced, thereby reducing costs.

[0041] (Summary of the embodiment) Next, the technical ideas grasped from the above-described embodiments will be described by using the reference numerals and the like in the embodiments. However, the reference numerals and the like in the following description do not limit the components in the claims to the members and the like specifically shown in the embodiments.

[0042] [1] A cable (1) comprising: an aggregate core (4) having a plurality of electric wires (2); a shielding layer (6) surrounding the aggregate core (4); and a sheath (8) surrounding the shielding layer (6), wherein the shielding layer (6) is made of a conductive tape (6a), the conductive tape (6a) is wound so that a portion of the conductive tape (6a) overlaps with another portion of the conductive tape (6a), and the overlapping portion of the conductive tape (6a) is fused; and an outer tape member (7) is provided between the conductive tape (6a) and the sheath (8) and is wound around the conductive tape (6a), and the outer tape member (7) and the conductive tape (6a) are not fused together.

[0043] [2] The cable (1) described in [1], wherein the conductive tape (6a) has a base material and conductive layers made of conductive resin provided on both surfaces of the base material.

[0044] [3] The cable (1) according to [1], further comprising an inner tape member (5) wound around the collective core (4) between the collective core (4) and the conductive tape (6a), and the inner tape member (5) and the conductive tape (6a) are not fused together.

[0045] [4] The cable (1) according to [3], wherein the twisting direction of the collective core (4), the winding direction of the conductive tape (6a), the winding direction of the outer tape member (7), and the winding direction of the inner tape member (5) are the same.

[0046] [5] The cable (1) according to [1], wherein the electric wire (2) has an insulator (21b) around the conductor (21a), and the insulator (21b) is made of a non-fluorine resin having a specific gravity of 1.0 or less.

[0047] [6] The cable (1) described in [1], further comprising a drain wire (9) provided in contact with the conductive tape (6a) in a valley portion between the collective core (4) and the conductive tape (6a) and between adjacent electric wires (2) in the circumferential direction of the cable.

[0048] [7] The cable (1) according to [6], wherein the drain wires (9) have the same twist direction and twist pitch as the collective core (4).

[0049] (Addendum) Although the embodiments of the present invention have been described above, the invention according to the claims is not limited to the above-described embodiments. It should be noted that not all of the combinations of features described in the embodiments are necessarily essential to the means for solving the problems of the invention. Furthermore, the present invention can be appropriately modified and implemented within the scope of its spirit. [Explanation of symbols]

[0050] 1...Cable 2...Electric wire 20...twisted pair wire 21...Insulated wire 21a...conductor 21b...Insulator 3...Fiber interposition 4...Collective Core 5...Inner tape member 6...Shield layer 6a...Conductive tape 7...Outer tape member 8...Sheath 9...Drain wire

Claims

1. a core assembly having a plurality of electric wires; a shield layer covering the periphery of the collective core; a sheath that covers the shield layer, the shielding layer is made of a conductive tape; The conductive tape is wound so that a part of the conductive tape overlaps with another part of the conductive tape, and the overlapped part of the conductive tape is fused. an outer tape member is provided between the conductive tape and the sheath and wound around the conductive tape, and the outer tape member and the conductive tape are not fused together; cable.

2. The conductive tape has a base material and conductive layers made of a conductive resin provided on both surfaces of the base material. The cable of claim 1 .

3. an inner tape member is provided between the aggregate core and the conductive tape and is wound around the aggregate core, and the inner tape member and the conductive tape are not fused together; The cable of claim 1 .

4. the twisting direction of the collective core, the winding direction of the conductive tape, the winding direction of the outer tape member, and the winding direction of the inner tape member are all the same; 4. The cable of claim 3.

5. The electric wire has an insulator around a conductor, The insulator is made of a non-fluorine resin having a specific gravity of 1.0 or less. The cable of claim 1 .

6. a drain wire provided in contact with the conductive tape in a valley portion between the electric wires adjacent in the circumferential direction of the cable, between the collective core and the conductive tape; The cable of claim 1 .

7. The drain wires have the same twist direction and twist pitch as the collective core.

7. The cable of claim 6.

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