Cable

Abstract

To provide a cable effective in built up static electricity.SOLUTION: A cable 1 includes: a plurality of signal lines 3 as a plurality of first electric wires disposed along a circumferential direction of the cable; a conductive tape 5 having conductivity wound around the plurality of signal lines 3 so as to be in contact with each of the plurality of signal lines 3; and a sheath 9 that covers a circumference of the conductive tape 5. The conductive tape 5 includes a base material and a conductive layer composed of a conductive resin which is disposed on a surface of the base material.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a cable.

Background Art

[0002] As cables wired in devices such as industrial robots, for example, there are Patent Documents 1 and 2. In the cables described in Patent Documents 1 and 2, a collective core in which a plurality of insulated electric wires are arranged in multiple layers along the cable diameter direction is provided, and a holding tape and a sheath are sequentially arranged around the collective core.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] In devices such as industrial robots, there are movable parts where operations such as bending, twisting, and swinging (referred to as operations such as bending) are repeatedly performed, and it is necessary to wire a cable through this movable part. In recent years, in order to cope with the complication of devices and the high speed of signals, cables including a large number of electric wires have been used. When wiring such a cable including a large number of electric wires to a movable part, when operations such as bending are repeatedly applied to the cable, the electric wires may rub against each other, and static electricity may be charged on the surface of the electric wires.

[0005] In addition, when a signal line for transmitting a control signal or the like is used for a part of a large number of electric wires, if static electricity is charged on the surface of the signal line, it may cause noise, resulting in a decrease in transmission characteristics or malfunction of the device where the cable is wired. For example, if charging occurs on the surface of a signal line for transmitting an image signal, there is a possibility of image distortion. Also, if charging occurs on the surface of a signal line for transmitting a control signal for controlling an industrial robot or the like, there is a possibility of malfunction or a decrease in operating performance of the industrial robot or the like.

[0006] Therefore, an object of the present invention is to provide a cable effective against charged static electricity.

Means for Solving the Problems

[0007] The present invention aims to solve the above problems, and includes a plurality of first electric wires arranged along the circumferential direction of the cable, a conductive conductive tape wound around the plurality of first electric wires so as to be in contact with each of the plurality of first electric wires, and a sheath covering the periphery of the conductive tape. The conductive tape has a base material and a conductive layer made of a conductive resin provided on the surface of the base material, and provides a cable.

Effects of the Invention

[0008] According to the present invention, it is possible to provide a cable effective against charged static electricity.

Brief Description of the Drawings

[0009]

Figure 1

Mode for Carrying Out the Invention

[0010] [Embodiment] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0011] FIG. 1 is a cross-sectional view showing a cross-section perpendicular to the longitudinal direction of the cable 1 according to the present embodiment. The cable 1 is used, for example, as internal wiring within a device such as an industrial robot, and is routed through a movable part where operations such as bending, twisting, and swinging (hereinafter referred to as operations such as bending) are repeatedly performed. Note that the cable 1 is not limited to this, and may be used as wiring for an automobile that is repeatedly swung (for example, wiring that connects a device provided on the vehicle body and a device provided on the wheel). Further, the cable 1 can be used, for example, as wiring for medical equipment or wiring to a location that touches a person's skin.

[0012] The cable 1 includes a center interposer 2, a plurality of signal lines 3 as a plurality of first electric wires, a drain wire 4, a conductive tape 5, a reinforcing layer 6, a plurality of power lines 7 as a plurality of second electric wires, a holding tape 8, and a sheath 9. Hereinafter, each part will be described in detail.

[0013] (Center interposer 2) Although operations such as bending are repeatedly applied to the cable 1, since the stress applied by operations such as bending increases at the center of the cable, it is desirable to arrange the center interposer 2 at the center of the cable without arranging the signal lines 3 or the power lines 7. In the present embodiment, a linear body made of resin having a circular cross-section is used as the center interposer 2. As the resin used for the center interposer 2, for example, PVC (polyvinyl chloride) or PP (polypropylene) can be used. However, the center interposer 2 is not limited to this, and may be a tubular tube having a hollow portion along the longitudinal direction, or may be a fiber interposer using fibers such as sph (staple fiber) or nylon. Note that the center interposer 2 can be omitted.

[0014] (Signal line 3) Cable 1 has a plurality of signal lines 3 arranged along the circumferential direction of the cable as a plurality of first electric wires. In the present embodiment, the plurality of signal lines 3 are spirally twisted around the center spacer 2. In FIG. 1, the case of using 24 signal lines 3 is shown, but the number of signal lines 3 used for the cable 1 is not limited to this. However, the present invention is particularly effective in a multi-core cable 1 using 12 or more signal lines 3.

[0015] In the present embodiment, each of the plurality of signal lines 3 is composed of a pair-twisted wire 3a formed by twisting a pair of insulated electric wires 31. The insulated electric wire 31 has a conductor 31a composed of a collective-stranded wire formed by collectively stranding a plurality of metal strands, and an insulator 31b covering the periphery of the conductor 31a. The metal strands constituting the conductor 31a are made of copper or a copper alloy, and may be plated with tin, silver, or the like on their surfaces. For example, the conductor 31a can be constituted by collectively stranding metal strands made of a tin-plated soft copper wire having an outer diameter of 0.05 mm or more and 0.10 mm or less. When the signal line 3 and the power line 7 are provided, the outer diameter of the plurality of conductors 31a is preferably smaller than the outer diameter of the conductor 7a constituting the power line 7 described later. Further, the signal line 3 is not limited to the pair-twisted wire 3a formed by twisting a pair of insulated electric wires 31. For example, the signal line 3 may be a coaxial line or the like having an outer conductor and an outer sheath around the insulated electric wire.

[0016] As the insulator 31b, in order to improve the transmission characteristics of high-speed signals, it is preferable to use one having a low dielectric constant (preferably, the dielectric constant is 3 or less), and a fluororesin such as ETFE (tetrafluoroethylene-ethylene copolymer), or a resin made of PP, PE (polyethylene), or the like may be used. In particular, when a large number of signal lines 3 are used, in order to suppress the increase in the outer diameter of the cable 1, it is desirable to use a fluororesin such as ETFE that can be formed with a thin wall for the insulator 31b.

[0017] The signal line 3 is formed by twisting a pair of insulated wires 31 and does not have a shield layer. In order to suppress crosstalk between the signal lines 3, it is advisable to make the twist pitches of the signal lines 3 (twisted pairs 3a) adjacent to each other in the circumferential direction of the cable different. The twist pitch of the signal line 3 (twisted pair 3a) is the interval along the longitudinal direction of the signal line 3 at a location where the circumferential position of an arbitrary insulated wire 31 (position in the circumferential direction of the signal line 3) is the same. In the present embodiment, by alternately arranging two types of signal lines 3 with different twist pitches, the twist pitches of the signal lines 3 adjacent to each other in the circumferential direction of the cable are configured to be different.

[0018] The twist direction of the twisted pair 3a and the twist direction of the plurality of signal lines 3 are preferably different directions. If the twist direction of the twisted pair 3a and the twist direction of the plurality of signal lines 3 are the same, the twist of the twisted pair 3a will be strengthened by the twisting of the plurality of signal lines 3. When the cable 1 is repeatedly subjected to operations such as bending, the insulated wire 31 is likely to break because of this. The twist direction of the twisted pair 3a is the direction in which the insulated wire 31 rotates from one end to the other end when viewed from one end of the twisted pair 3a. The twist direction of the plurality of signal lines 3 is the direction in which the signal line 3 (twisted pair 3a) rotates from one end to the other end when viewed from one end of the cable 1.

[0019] By the way, fluororesin is more likely to be charged by rubbing than resins made of PP or PE. Therefore, if fluororesin is used for the insulator 31b to reduce the diameter of the cable 1, the insulator 31b is likely to be charged when the cable 1 is repeatedly subjected to operations such as bending. Furthermore, when the twisted pair 3a is used as the signal line 3, the surface of the signal line 3 becomes more uneven. Due to the rubbing between these unevennesses and the rubbing between the unevennesses and other members, the insulator 31b is likely to be charged, and furthermore, charging due to rubbing also occurs between the insulated wires 31 used for the signal line 3. Therefore, in the signal line 3 composed of the twisted pair 3a, when the cable 1 is repeatedly subjected to operations such as bending, the insulator 31b is in a state where it is more likely to be charged. In order to discharge the charge due to this charging to the ground (that is, to enable suppression of charging), the conductive tape 5 and the drain wire 4 described below are provided.

[0020] (Conductive tape 5 and drain wire 4) The conductive tape 5 is spirally wound around the plurality of signal lines 3 so as to be in contact with each of the plurality of signal lines 3. The conductive tape 5 is a member that serves both to release the charge charged on the signal line 3 to the ground and as a shield layer.

[0021] The conductive tape 5 is composed of a tape member (first tape member) having a base material and a conductive conductive layer provided on the surface of the base material. The base material is made of a resin based on a resin such as a polyolefin resin and is formed in a long strip shape. The base material has a first surface and a second surface facing each other in a thickness direction orthogonal to the longitudinal direction of the base material. The conductive layer is provided in a laminated state so as to cover at least one of the surfaces (the first surface and the second surface) of the base material. The conductive layer is made of a conductive resin in which conductive fine particles are dispersed in a base resin such as a polyolefin resin. The conductive tape 5 is spirally wound around the plurality of signal lines 3 in a state where the conductive layer is in contact with the signal line 3. Incidentally, the base resins constituting the base material 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. Further, the base material may have conductivity.

[0022] In this embodiment, an olefin resin with a low dielectric constant and capable of improving electrical characteristics is used as the base resin of the tape member constituting the conductive tape 5. More specifically, the base material constituting the tape member has a base resin made of an olefin resin, and the conductive layer constituting the tape member is made of a conductive resin in which conductive fine particles are dispersed in the base resin made of an olefin resin. Thereby, the conductive tape 5 can play the above-described role while having softness as a tape member (flexibility and flexibility that can flex smoothly when bent). As the olefin resin, for example, PP or PE can be used. As the conductive fine particles, carbon fine particles can be used. The conductive tape 5 is wound spirally so that a part in the width direction overlaps. The winding direction of the conductive tape 5 is preferably the same direction as the twisting direction of the signal line 3. Thereby, the cable 1 can be easily bent and the bending resistance can also be improved.

[0023] The tape member constituting the conductive tape 5 is an extrusion molded body in which the resin constituting the base material and the conductive resin constituting the conductive layer are simultaneously extruded using an extruder to laminate the conductive layer on one or both of the surfaces (the first surface and the second surface) of the base material. In particular, it is preferable to use the same olefin resin for the base resin constituting the base material and the base resin constituting the conductive layer. Thereby, the adhesion at the interface between the base material and the conductive layer can be enhanced. Therefore, even when an operation such as repeated bending is applied to the cable 1, it is possible to suppress the occurrence of peeling or the like at the interface between the base material and the conductive layer, and the function as the conductive tape 5 is less likely to deteriorate. Also, it is preferable that conductive layers are provided on both the first surface and the second surface of the base material. Thereby, it becomes easier to achieve both the role of discharging the charge charged on the signal line 3 to the ground and the role as a shield layer.

[0024] The conductive tape 5 preferably has an overall thickness (thickness of the tape member) of 90 μm or more and 150 μm or less. More preferably, the thickness of the conductive tape 5 is 90 μm or more and 150 μm or less and is smaller than the thickness of the insulator 31b. When the overall thickness of the conductive tape 5 is 90 μm or more, the conductive tape 5 is less likely to break when the cable 1 is bent or twisted. Also, when the overall thickness of the conductive tape 5 is 150 μm or less, other members (such as the signal line 3) that come into contact with the conductive tape 5 are less likely to be damaged when the cable 1 is bent or twisted. Therefore, by setting the overall thickness of the conductive tape 5 within the above-described range, the resistance of the cable 1 when the cable 1 is bent or twisted can be increased. At this time, the thickness of the base material constituting the tape member is preferably larger than the thickness of the conductive layer provided on one surface of the base material. For example, the thickness of the base material is preferably 2 times or more the thickness of the conductive layer. More preferably, the thickness of the base material is 2 times or more and 3 times or less 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 larger than the thickness of the conductive layer provided on one surface of the base material and larger than the total thickness of the conductive layers provided on both surfaces of the base material. Also, the surface resistance value of the conductive tape 5 is greater than 1.0×10 6 Ω and not more than 3.0×10 6 Ω, preferably not less than 1.2×10 6 Ω and not more than 2.0×10 6 Ω.

[0025] The winding direction of the conductive tape 5 is preferably the same as the twisting direction of the plurality of signal lines 3. This makes it less likely for the twists of the plurality of signal lines 3 to loosen. Note that the winding direction of the conductive tape 5 is the direction in which the conductive tape 5 rotates from one end to the other end as viewed from one end of the cable 1.

[0026] The conductive tape 5 is composed of a tape member having a non-conductive base material made of an olefin resin and a conductive layer provided on the surface of the base material and made of a conductive resin in which conductive fine particles are dispersed in the olefin resin. Thus, the tape member has softness as a tape member (flexibility and softness that can flex smoothly when bent), and the conductivity will not deteriorate due to rubbing against the signal line 3. Therefore, even if an operation such as repeated bending is applied to the cable 1, the signal line 3 (insulator 31b) is not easily worn due to rubbing against the conductive tape 5, and a decrease in electrical characteristics can also be suppressed. For example, instead of the conductive tape 5, it is also conceivable to use a metal tape such as a copper PET tape in which a copper layer is formed on one surface of a resin tape made of PET (polyethylene terephthalate). However, when a metal tape is used instead of the conductive tape 5, since the metal tape is hard, when an operation such as repeated bending is applied to the cable 1, the edge of the metal tape rubs against the insulator 31b and the insulator 31b is scraped off, and the resistance to operations such as bending may be greatly reduced. Also, for example, when a copper-plated tape obtained by plating a cloth-like body is used instead of the conductive tape 5, although scraping of the insulator 31b can be suppressed, the copper plating is likely to peel off due to rubbing against the signal line 3, and there is a risk that the shielding performance will deteriorate and the electrical characteristics will deteriorate.

[0027] The drain wire 4 serves to ground the conductive tape 5. In the present embodiment, since it is difficult to connect the conductive tape 5 to the ground line by soldering during terminal processing and it is not easy to ground, the drain wire 4 is used to facilitate terminal processing. The drain wire 4 is arranged so as to be in contact with the conductive tape 5 between a pair of signal lines 3 adjacent to each other in the circumferential direction of the cable among the plurality of signal lines 3 and the conductive tape 5. In the present embodiment, the drain wire 4 is twisted spirally together with the plurality of signal lines 3, and the conductive tape 5 is wound around it.

[0028] The drain wire 4 is composed of a stranded wire conductor formed by twisting a plurality of metal strands. The metal strands constituting the drain wire 4 are made of copper or a copper alloy, and may be plated with tin, silver, or the like on their surfaces. The drain wire 4 can be formed, for example, by concentrically twisting or bunching a plurality of metal strands made of a tinned soft copper wire having an outer diameter of 0.05 mm or more and 0.10 mm or less. The drain wire 4 has a smaller outer diameter than the signal wire 3 and is arranged so as to enter the valley portion between adjacent signal wires 3 in the circumferential direction of the cable.

[0029] (Reinforcing layer 6) The reinforcing layer 6 is provided between the conductive tape 5 and the plurality of power supply lines 7, and serves to protect the relatively soft conductive tape 5 from being crushed against the radial inward pressing force when the plurality of power supply lines 7 are twisted together. In addition, the reinforcing layer 6 also serves to protect the conductive tape 5 from being damaged due to rubbing between the conductive tape 5 and the power supply lines 7 when the cable 1 is repeatedly bent or the like.

[0030] The reinforcing layer 6 may be a layer formed by extrusion molding. However, in this case, since the reinforcing layer 6 becomes a cylindrical molded body, it becomes difficult to bend the cable 1, and there is a risk that the reinforcing layer 6 may break if the cable 1 is bent forcibly. Therefore, from the viewpoint of facilitating bending of the cable 1, the reinforcing layer 6 is preferably configured by spirally winding a tape member (second tape member) made of resin around the conductive tape 5. By configuring the reinforcing layer 6 with a tape member, it becomes possible to perform the winding of the conductive tape 5 and the winding of the tape member of the reinforcing layer 6 in one step, and it is also possible to reduce the manufacturing cost. Note that the winding direction of the tape member constituting the reinforcing layer 6 is preferably the same as the winding direction of the conductive tape 5. This makes it difficult for the winding of the conductive tape 5 to loosen.

[0031] As the tape member used for the reinforcing layer 6, for example, a resin tape made of a non-foamed resin such as PE, PP, or PVC, a foamed resin tape made of a foamed resin such as foamed PP, a non-woven fabric, etc. can be used. In order to enhance the cushioning property and further improve the protection performance of the conductive tape 5, it can be said that it is more desirable to use a foamed resin tape. In order to further improve the protection performance of the conductive tape 5, the tape member used for the reinforcing layer 6 is preferably at least thicker than the conductive tape 5. More specifically, the thickness of the tape member used for the reinforcing layer 6 is preferably greater than 1 times and less than or equal to 3 times the thickness of the conductive tape 5. Note that the reinforcing layer 6 can be omitted.

[0032] (Power line 7) Around the reinforcing layer 6, a plurality of power lines 7 are wound along the circumferential direction of the cable as a plurality of second electric wires. Here, the case of using 36 power lines 7 is shown, but the number of power lines 7 is not limited to this. The power line 7 has a conductor 7a composed of a stranded wire formed by collectively stranding a plurality of metal strands, and an insulator 7b covering the periphery of the conductor 7a. The metal strands constituting the conductor 7a are made of copper or a copper alloy, and may be plated with tin, silver, etc. on its surface. The conductor 7a can be formed, for example, by collectively stranding a plurality of metal strands made of a tinned soft copper wire with an outer diameter greater than 0.10 mm.

[0033] The twisting direction of the power line 7 is preferably the same as the twisting direction of the signal line 3. Thereby, the cable 1 can be easily bent, and the resistance to operations such as bending can also be improved. Note that the power line 7 is not essential and can be omitted. When the power line 7 is omitted, the reinforcing layer 6 can also be omitted accordingly. Also, only signal lines can be twisted around the reinforcing layer 6 instead of the power line 7, or both the power line 7 and the signal lines can be mixed and twisted together.

[0034] Note that in cable 1, a plurality of power lines 7 (a plurality of second electric wires) may not be arranged outside the cable in the radial direction from the conductive tape 5. At this time, the cable 1 is provided with a sheath 9 around the conductive tape 5 or the reinforcing layer 6 in a state of being in contact with the conductive tape 5 or the reinforcing layer 6. Further, in the cable 1, a plurality of power lines 7 and a plurality of signal lines 3 may be arranged in a mixed manner along the circumferential direction of the cable outside the cable in the radial direction from the conductive tape 5.

[0035] (Pressing tape 8) The pressing tape 8 serves to hold the twists of the power lines 7 so that they do not unwind. As the pressing tape 8, for example, a resin tape made of PE, PP, or the like can be used. The pressing tape 8 is spirally wound around the plurality of power lines 7 so that a part in the width direction overlaps. The winding direction of the pressing tape 8 is preferably the same as the winding direction of the conductive tape 5. Note that when using a signal line instead of the power line 7 or when mixing the power line 7 and the signal line outside the cable in the radial direction from the conductive tape 5, a conductive tape may be used as the pressing tape 8 to suppress charging. In this case, it is desirable to also provide a drain wire for grounding the conductive tape. Note that the tape member used for the reinforcing layer 6 is made thicker than the pressing tape 8. Further, the thickness of the pressing tape 8 is preferably equal to or less than the thickness of the conductive tape 5. Further, when the power line 7 is not provided outside the cable in the radial direction from the conductive tape 5, etc., the pressing tape 8 can be omitted.

[0036] (Sheath 9) The sheath 9 is provided to cover the periphery of the pressing tape 8. The sheath 9 is made of, for example, a resin composition mainly composed of PVC, silicone rubber, chlorinated polyethylene, etc. When used in applications that require chemical resistance or applications that come into contact with human skin, it is advisable to use a resin composition mainly composed of silicone rubber. The resin composition may contain additives such as crosslinking agents, crosslinking catalysts, antioxidants, plasticizers, lubricants, fillers, flame retardants, stabilizers, colorants, etc. Further, a film for improving the slipperiness of the surface of the sheath 9 may be provided to cover the surface of the sheath 9. In particular, when the sheath 9 is made of a resin composition mainly composed of silicone rubber, it is advisable to provide a film for improving the slipperiness on its surface. The film provided on the surface of the sheath 9 can be, for example, a film formed by curing a liquid silicone rubber containing fine particles with an average particle diameter of 1 μm or more and 10 μm or less by an addition reaction. The fine particles are made of, for example, silicone rubber, silicone resin, etc. The thickness of the film is, for example, 3 μm or more and 100 μm or less. The static friction coefficient of the surface of the film is 0.5 or less. Also, the sheath 9 is preferably separated from the underlying member by a minute gap or the like. Thereby, rubbing can be suppressed from occurring between the sheath 9 and the underlying member due to operations such as bending, and deterioration of the sheath 9 can be prevented.

[0037] (Actions and Effects of the Embodiment) As described above, in the cable 1 according to the present embodiment, a conductive conductive tape 5 spirally wound around a plurality of signal lines 3 is provided so as to be in contact with each of the plurality of signal lines 3. The conductive tape 5 has a conductive layer made of a conductive resin in which conductive fine particles are dispersed in an olefin-based resin.

[0038] By configuring it in this way, when repeated operations such as bending, twisting, and swinging are applied to the cable 1, the charges generated by the rubbing between the signal lines 3 can be guided to the ground through the conductive tape 5 (and the drain line 4), and the charging of the signal lines 3 can be suppressed. As a result, the degradation of the transmission characteristics due to charging can be suppressed, and the transmission characteristics of the signal lines 3 can be maintained well. In particular, when a fluororesin that can be formed into a thin film for reducing the diameter of the cable 1 is used as the insulator 31b of the signal line 3, charging due to rubbing is likely to occur, so the effect of this embodiment is significant. That is, according to this embodiment, even when a fluororesin is used as the insulator 31b of the signal line 3, it is possible to suppress the degradation of the transmission characteristics due to charging, which contributes to the reduction of the diameter of the cable 1.

[0039] (Modification example) Although not mentioned in the above embodiment, when noise countermeasures are required at a relatively low frequency, in order to increase the metal volume as a shield, a shield layer such as a braided shield may be provided between the conductive tape 5 and the pressing tape 8.

[0040] Also, in the cable 1, a plurality of first electric wires, that is, the signal lines 3 and the power supply lines 7, may be arranged in a mixed state inside the cable 1 in the radial direction of the cable diameter, closer to the inside than the conductive tape 5. As the plurality of first electric wires, for example, those in which the signal lines 3 and the power supply lines 7 are arranged along the circumferential direction of the cable inside the cable 1 in the radial direction of the cable diameter, closer to the inside than the conductive tape 5, those in which a plurality of power supply lines 7 are arranged so as to surround the outer circumference of a plurality of signal lines 3 arranged along the circumferential direction of the cable, those in which the power supply line 7 is arranged inside a plurality of signal lines 3 arranged along the circumferential direction of the cable, and the like can be used.

[0041] Also, in the cable 1, a plurality of signal lines 3 are arranged along the circumferential direction of the cable as a plurality of first electric wires inside the cable 1 in the radial direction of the cable diameter, closer to the inside than the conductive tape 5. However, a plurality of power supply lines may be arranged along the circumferential direction of the cable instead of the plurality of signal lines 3.

[0042] In addition, in the cable 1, in a plurality of first electric wires and a plurality of second electric wires arranged along the circumferential direction of the cable, an intervening member made of a resin string, a fiber thread, or the like may be arranged between the adjacent electric wires to fill the gap therebetween. When a plurality of intervening members are arranged, it is preferable that the intervening members made of the same member are arranged at equal intervals along the circumferential direction of the cable.

[0043] (Summary of Embodiment) Next, the technical idea grasped from the above-described embodiments will be described by referring to the reference numerals and the like in the embodiments. However, each reference numeral and the like in the following description are not limited to the members specifically shown in the embodiments for the components in the claims.

[0044] [1] A cable (1) comprising: a plurality of first electric wires (signal wires 3) arranged along the circumferential direction of the cable; a conductive conductive tape (5) wound around the plurality of first electric wires (signal wires 3) so as to be in contact with each of the plurality of first electric wires (signal wires 3); and a sheath (9) covering the periphery of the conductive tape (5), wherein the conductive tape (5) has a base material and a conductive layer made of a conductive resin provided on the surface of the base material.

[0045] [2] The cable (1) according to [1], further comprising: a plurality of second electric wires (power supply wires 7) twisted along the circumferential direction of the cable around the conductive tape (5); and a reinforcing layer (6) provided between the conductive tape (5) and the plurality of second electric wires (power supply wires 7) for protecting the conductive tape (5).

[0046] [3] The cable (1) according to [2], wherein the reinforcing layer (6) is formed by winding a tape member made of resin around the conductive tape (5).

[0047] [4] The cable (1) according to [3], wherein the tape member is thicker than the conductive tape (5).

[0048] [5] The cable (1) according to [1], having a central intervening member (2) disposed at the center of the cable, wherein the plurality of signal lines (3) are spirally twisted around the central intervening member (2).

[0049] [6] The cable (1) according to [1], wherein each of the plurality of first electric wires (signal lines 3) is a pair-twisted wire (3a) formed by twisting a pair of insulated electric wires (31).

[0050] [7] The cable (1) according to [1], wherein a drain wire (4) is disposed between a pair of the first electric wires (signal lines 3) adjacent to each other in the circumferential direction of the cable among the plurality of first electric wires (signal lines 3) so as to contact the conductive tape (5).

[0051] [8] The cable (1) according to [1], wherein the plurality of first electric wires are signal lines (3).

[0052] [9] The cable (1) according to [2], wherein the plurality of second electric wires are power lines (7).

[0053] (Addendum) Although the embodiments of the present invention have been described above, the embodiments described above do not limit the invention according to the claims. Also, it should be noted that not all combinations of the features described in the embodiments are essential means for solving the problems of the invention. Further, the present invention can be appropriately modified and implemented without departing from its gist.

Explanation of Reference Numerals

[0054] 1... Cable 2... Central intervening member 3... Signal line 3a... Pair-twisted wire 31... Insulated electric wire 31a... Conductor 31b... Insulator 4... Drain wire 5... Conductive tape 6... Reinforcing layer 7... Power line 8... Holding tape 9... Sheath

Claims

1. A plurality of first electric wires arranged along the circumferential direction of the cable, A conductive conductive tape wound around the plurality of first electric wires so as to be in contact with each of the plurality of first electric wires, A sheath covering the periphery of the conductive tape, comprising: The conductive tape has a base material and a conductive layer made of a conductive resin provided on the surface of the base material. Cable.

2. A plurality of second electric wires twisted along the circumferential direction of the cable around the conductive tape, A reinforcing layer provided between the conductive tape and the plurality of second electric wires for protecting the conductive tape. The cable according to claim 1.

3. The reinforcing layer is configured by winding a tape member made of resin around the conductive tape. The cable according to claim 2.

4. The tape member is thicker than the conductive tape. The cable according to claim 3.

5. Having a central interposition disposed at the center of the cable, The plurality of first electric wires are spirally twisted around the central interposition. The cable according to claim 1.

6. Each of the plurality of first electric wires is composed of a pair of twisted wires obtained by twisting a pair of insulated electric wires. The cable according to claim 1.

7. A drain wire is disposed between a pair of the first electric wires adjacent to each other in the circumferential direction of the cable among the plurality of first electric wires so as to be in contact with the conductive tape. The cable according to claim 1.

8. The plurality of first electric wires are composed of signal lines. The cable according to claim 1.

9. The plurality of second electric wires are composed of power supply lines. The cable according to claim 2.

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