CN116153565A - Cable with improved cable characteristics - Google Patents

Abstract

The invention provides a cable which can reduce the use amount of copper and is difficult to cause wire breakage in a shielding layer due to the influence of external force and dead weight. A cable (1) is provided with a cable core (3) having 1 or more wires (2), a shield layer (4) covering the periphery of the cable core (3), and a sheath (5) covering the periphery of the shield layer (4), wherein the shield layer (4) is formed by a braided shield in which a plurality of first metal wires (41) formed of aluminum or an aluminum alloy and a plurality of second metal wires (42) formed of copper or a copper alloy are braided in a crossing manner, and the outer diameter of the second metal wires (42) is larger than the outer diameter of the first metal wires (41).

Description

Cable with improved cable characteristics

Technical Field

The present invention relates to a cable.

Background

In the related art, as a cable connected to a servomotor or the like, for example, there is a composite cable including a plurality of signal wires formed of twisted pair wires and a plurality of power wires disposed around the signal wires (for example, refer to patent document 1). In this cable, a shield layer is provided so as to cover a plurality of signal wires and a plurality of power wires at a time, and the shield layer is formed by braiding a braided shield member made of a metal wire material composed of a tin-plated annealed copper wire.

Prior art literature

Patent literature

Patent document 1: japanese patent laid-open No. 2002-313144

Disclosure of Invention

Problems to be solved by the invention

In recent years, decarburization is accelerated, and world copper demand is increasing as a decarburization resource, so that copper price is rising. For example, the price of copper is 4 times or more that of aluminum. Therefore, in the wire and cable, it is desired to reduce the amount of copper used for the conductor and the shield layer while taking into consideration the influence on the conductor resistance and the shield characteristics. In particular, in the cable, the outer diameter of the cable tends to be large as the number of wires is increased. If the outer diameter of the cable is increased, the amount of copper used as the metal wire constituting the shield layer is also increased, and the cost may be greatly increased.

In addition, in the case of forming the shield layer by using a metal wire made of copper or a copper alloy in the cable, the weight of the cable tends to increase as the amount of the metal wire used increases. When the proportion of the weight of the shield layer to the weight of the entire cable is large, for example, when the cable is bent, an external force to the cable, the weight of the cable, or the like is applied to the shield layer, and a large load is applied to the shield layer. Therefore, the metal wire material constituting the shielding layer may be broken due to the influence of external force or self weight.

Accordingly, an object of the present invention is to provide a cable in which the amount of copper used can be reduced and breakage of a shield layer due to external force or self weight is less likely to occur.

Means for solving the problems

The present invention has been made to solve the above problems, and an object of the present invention is to provide a cable comprising: a cable core having 1 or more wires; a shielding layer covering the periphery of the cable core; and a sheath covering the periphery of the shielding layer, wherein the shielding layer is formed by a braided shielding member, the braided shielding member is formed by braiding a plurality of first metal wires formed by aluminum or aluminum alloy and a plurality of second metal wires formed by copper or copper alloy in a crossing manner, and the outer diameter of the second metal wires is larger than that of the first metal wires.

The effects of the invention are as follows.

According to the present invention, it is possible to provide a cable in which the amount of copper used can be reduced and breakage of a shield layer due to external force or self weight is less likely to occur.

Drawings

Fig. 1 (a) is a cross-sectional view showing a cross-section perpendicular to the longitudinal direction of an electric wire according to an embodiment of the present invention, (b) is a schematic view of a shield layer, and (c) is a schematic view of an inner shield layer.

Fig. 2 is a cross-sectional view perpendicular to the longitudinal direction of an electric wire according to another embodiment of the present invention.

Symbol description

1-cable, 2-wire, 21-signal wire, 22-power wire, 3-cable core, 3 a-inner core, 3 b-outer core, 4-shielding layer, 41-first metal wire, 42-second metal wire, 5-sheath, 8-inner shielding layer, 81-third metal wire, 82-fourth metal wire.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Fig. 1 (a) is a cross-sectional view showing a cross-section perpendicular to the longitudinal direction of the electric wire according to the present embodiment. Fig. 1 (b) is a schematic view of a shield layer (hereinafter, also referred to as an outer shield layer), and fig. 1 (c) is a schematic view of an inner shield layer. The cable 1 is used as a cable for a fixing portion for connecting an industrial robot to a control device or the like in a factory or the like, for example. The cable 1 may be used as a cable for a fixing portion of a plant other than an industrial robot, or may be used as a cable for wiring in an automobile or the like.

As shown in fig. 1 (a), the cable 1 includes: a cable core 3 having 1 or more electric wires 2; a shield layer 4 (hereinafter also referred to as an outer shield layer 4) covering the periphery of the cable core 3; and a sheath 5 covering the periphery of the shielding layer 4.

(electric wire 2)

The electric wire 2 includes a plurality of signal lines 21 for transmitting signals and a plurality of power lines 22 for supplying power. That is, the cable 1 is a composite cable in which the signal line 21 and the power line 22 are combined.

The signal line 21 is formed of a twisted pair 212 formed by twisting a pair of insulated wires 211. Each insulated wire 211 constituting the twisted pair 212 includes a conductor 211a formed by twisting a plurality of wires (for example, wires having an outer diameter of 0.1mm or less) made of tin-plated annealed copper wires or the like, and an insulator 211b provided so as to cover the periphery of the conductor 211 a. The insulator 211b is made of a fluororesin such as ETFE (tetrafluoroethylene-ethylene copolymer), FEP (tetrafluoroethylene-hexafluoropropylene copolymer), PFA (tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer), or the like.

Here, the case where 6 (6 pairs) of the signal lines 21 (twisted pairs 212) are used is shown, but the number of the signal lines 21 (twisted pairs 212) is not limited thereto. That is, the number of signal lines 21 may be 1 or more than 6. To suppress crosstalk (noise) between twisted pairs 212, each pair of twisted pairs 212 is more preferably twisted at a different twist lay distance. The signal line 21 is not limited to the twisted pair 212. For example, the signal line 21 may be a coaxial cable.

The power supply line 22 includes a conductor 22a formed by twisting a plurality of wires (for example, wires having an outer diameter of 0.1mm or less) made of a tin-plated annealed copper wire or the like, and an insulator 22b provided so as to cover the periphery of the conductor 22 a. The insulator 22b is made of a fluororesin such as ETFE (tetrafluoroethylene-ethylene copolymer), FEP (tetrafluoroethylene-hexafluoropropylene copolymer), PFA (tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer), or the like. The power supply line 22 has a larger conductor cross-sectional area than the insulated wire 211 constituting the twisted pair 212, and has a larger outer diameter. Here, 11 power lines 22 are used, but the number of power lines 22 is not limited to this. That is, the number of the power lines 22 may be 1 or more than 11.

(Cable core 3)

The cable core 3 has an inner shield layer 8 that covers the circumference of the electric wire 2 and is provided inside the shield layer 4. For example, in the cable 1 shown in fig. 1 (a), the cable core 3 has: an inner core 3a including a plurality of signal lines 21; an inner shielding layer 8 provided so as to cover the periphery of the inner core 3 a; and an outer core 3b including a plurality of power wires 22 stranded around the inner shielding layer 8. In the cable 1 shown in fig. 1 (a), the electric wire 2 is provided around the inner shield layer 8, but the present invention is not limited to this. That is, the cable core 3 may not be provided with the electric wire 2 between the inner shield layer 8 and the shield layer 4. This can reduce the outer diameter of the cable 1, and thus can reduce the amount of metal wires made of copper or copper alloy that constitute a shield layer provided on the outer side of the cable core. As a result, the cost of the cable 1 can be reduced.

The inner core 3a is formed by twisting 6 (6 pairs of) signal wires 21 (twisted pair 212). Since stress is concentrated in the cable center portion at the time of bending, in the present embodiment, the signal wires 21 (twisted pairs 212) are helically twisted around the filler 6 to constitute the inner core 3a. This can suppress the stress concentration on the signal line 21 (twisted pair 212) during bending and the deterioration of the transmission characteristics of the signal line 21 (twisted pair 212).

As the filler 6, for example, a thread-like body such as a staple fiber (staple fiber) may be used. The staple fiber yarn has a suitable cushioning property and does not break even when bent, and is therefore particularly suitable for use in bending the cable 1. The thread-like body used for the filler 6 is not limited to the staple fiber yarn, and for example, a thread-like body made of a rope, paper, jute fiber, nonwoven fabric, or the like may be used. The filler 6 is not limited to a linear body, and for example, a band-shaped filler may be used. The filler 6 also plays a role of suppressing deterioration of the transmission characteristics of the signal line 21 (twisted pair 212) by imparting cushioning properties to disperse stress applied to the signal line 21 (twisted pair 212) when bending.

The twisted pair 212 is preferably twisted in the opposite direction to the twisted direction of the conductor 211a and the inner core 3a. The direction of the twisting of the conductor 211a is the same as the direction of the twisting of the inner core 3a. This is because, when the twisted direction of the twisted pair 212 is set to be the same as the twisted direction of the conductor 211a and the inner core 3a, the wires constituting the conductor 211a are repeatedly twisted in the same direction, and there is a concern that the wires are broken during bending or the like. By setting the twisting direction of the twisted pair 212 to be opposite to the twisting direction of the conductor 211a and the inner core 3a, breakage of the wire can be suppressed, and resistance against bending can be improved.

The twisting direction of the conductor 211a is a direction in which the wire rotates from the other end side to the one end side when viewed from the one end side of the insulated wire 211. The twisted direction of the twisted pair 212 is a direction in which the insulated wire 211 rotates from the other end side to the one end side when viewed from the one end side of the inner core 3a. The twisting direction of the inner core 3a is a direction in which the twisted pair 212 rotates from the other end side to the one end side when viewed from the one end side of the inner core 3a.

Around the inner core 3a, a first pressure-sensitive tape 7 is spirally wound. As the first pressure-sensitive adhesive tape 7, a tape member made of paper tape or nonwoven fabric, or the like can be used. The first roll tape 7 is wound so as to be substantially circular in cross section. The signal wires 21 (twisted pairs 212) constituting the inner core 3a are respectively in contact with the inner peripheral surface of the first crimp band 7. An inner shielding layer 8 is provided around the first tape 7. The inner shielding layer 8 is described in detail below.

Around the inner shield layer 8, a resin tape 9 is spirally wound. The resin tape 9 plays a role of improving sliding between the power supply line 22 constituting the outer core 3b and the inner shield layer 8 and suppressing abrasion. As the resin tape 9, a material that is resistant to abrasion and has good sliding properties is preferably used, and for example, a resin tape made of nylon, or a fluororesin such as PTFE (polytetrafluoroethylene) or ETFE (tetrafluoroethylene-ethylene copolymer) is used. The resin tape 9 may not be provided depending on the application of the cable 1, the wiring site, and the like.

The outer core 3b is formed by helically twisting 11 power wires 22 around the resin tape 9. In the present embodiment, the filler 11 is twisted together with the power cord 22 to constitute the outer core 3b. The filler 11 functions to shape the outer shape of the cable 1 into a circular shape and is interposed between the power supply wires 22 constituting the outer core 3b to suppress abrasion of the power supply wires 22 when they are bent or the like. In the present embodiment, in the outer core 3b, the adjacent power supply lines 22 are not in contact with each other. As the filler 11 used for the outer core 3b, artificial staple fibers or the like can be used, as in the filler 6 used for the inner core 3a. In the cable core 3, the outer core 3b may not be provided depending on the application of the cable 1, the wiring site, and the like, as described above. At this time, the cable 1 has a structure in which, for example, a resin tape 9 and a second pressure-sensitive tape 10 described below are provided around the inner shield layer 8 as needed, and a shield layer 4 is provided outside the cable core 3.

A second roll tape 10 made of paper tape or nonwoven fabric is spirally wound around the outer core 3b. The second roll tape 10 is wound in a substantially circular shape in cross section by appropriately adjusting the amount and arrangement of the filler 11. All the power supply wires 22 constituting the outer core 3b are respectively in contact with the inner peripheral surface of the second pressure-sensitive tape 10 and the outer peripheral surface of the resin tape 9. The second pressure-sensitive adhesive tape 10 may not be provided depending on the application of the cable 1, the wiring site, and the like.

(sheath 5)

An outer shield layer 4 is provided around the second tape 10, and a sheath 5 made of an insulator is provided so as to cover the outer shield layer 4. As the sheath 5, for example, a sheath composed of a resin composition based on a polyvinyl chloride (PVC) resin, a Polyurethane (PU) resin, or the like can be used in order to protect the cable 1 from external forces.

(outer shielding layer 4)

As shown in fig. 1 (b), in the cable 1 of the present embodiment, the outer shield layer 4 is formed of a braided shield in which a plurality of first metal wires 41 made of aluminum or an aluminum alloy and a plurality of second metal wires 42 made of copper or a copper alloy are used, and the first metal wires 41 and the second metal wires 42 are braided so as to intersect each other.

This can reduce the amount of copper used, and can reduce the weight of the outer shield layer 4 as compared with a braided shield formed by using only a metal wire made of copper or a copper alloy, and can reduce the weight of the entire cable 1. The outer shield layer 4 includes the second metal wire 42 made of aluminum or an aluminum alloy having a low yield strength, and thus the outer shield layer 4 is soft and the cable 1 is easily bent. Further, when the cable 1 is bent, the outer shield layer 4 is less likely to cause breakage of the metal wires due to friction between the metal wires, as compared with a braided shield formed only of metal wires made of aluminum or an aluminum alloy. This is because, compared to a braided shield in which metal wires made of aluminum or aluminum alloy are braided with each other, a braided shield in which a first metal wire 41 made of aluminum or aluminum alloy and a second metal wire 42 made of copper or copper alloy are braided with each other easily slides with each other when the metal wires rub against each other, and abrasion is less likely to occur.

Further, when connecting the end of the cable 1 to a substrate or the like, it is difficult to connect the braided shield formed only with a metal wire made of aluminum or an aluminum alloy by soldering. In contrast, in the present embodiment, since the outer shield layer 4 includes the second metal wire 42 made of copper or copper alloy, connection by soldering can be easily performed.

In addition, at the time of processing the end of the cable 1, the outer shield layer 4 may be exposed at the end of the cable 1, the exposed outer shield layer 4 (braided shield) may be unwound by a special tool or the like, and the unwound and dispersed metal wires 41 and 42 may be bundled so as to branch from the cable core 3 and connected to a substrate or the like. In this case, the outer shield layer 4 is connected to the substrate or the like by caulking or soldering the bundled metal wires 41 and 42. In the present embodiment, since the outer shield layer 4 includes the first metal wire 41 made of aluminum or aluminum alloy having a low yield strength, the operation of releasing the outer shield layer 4 can be easily performed as compared with the braided shield made of only copper. Further, when the untwisted wires 41 and 42 are bundled, the first wire 41 also plays a role of holding the shape, so that the wires 41 and 42 are easily bundled into a desired shape. In addition, when bundling the wires 41 and 42, the second wire 42 is wound around the first wire 41 in a spiral manner around the first wire 41, so that the connection by soldering can be easily performed.

In the present embodiment, as the first metal wire 41 made of aluminum, for example, an aluminum wire made of pure aluminum is used. As the first metal wire 41 made of an aluminum alloy, for example, an aluminum alloy wire made of an al—zr alloy, an al—ni—zr alloy, an al—co—zr alloy, an al—fe—zr alloy, or the like can be used. As the second metal wire 42 made of copper, a tin-plated annealed copper wire having a tin-plated layer on the surface of the annealed copper wire can be used. As the second metal wire 42 made of a copper alloy, a copper alloy wire made of a copper alloy containing one or more metal elements such as magnesium, tin, indium, silver, nickel, zinc, and the like in a predetermined content, with the remainder being copper and unavoidable impurities, can be used. Further, the annealed copper wire can be a annealed copper wire, an oxygen-free copper wire, or the like. In the present embodiment, in order to further suppress breakage due to friction between the metal wires, liquid paraffin may be added as a lubricating oil to the surface of the second metal wire 42 (for example, the surface of a tin-plated annealed copper wire).

In the cable 1 of the present embodiment, the outer diameter of the second metal wire 42 is larger than the outer diameter of the first metal wire 41. The outer shield layer 4 receives a large load when an external force is applied to the cable 1, when the cable 1 is bent, or the like. In particular, in the cable 1 having a large number of wires 2 and a large diameter (outer diameter of 10mm or more), a load is applied to the outer shield layer 4 by the weight (self weight) of the cable 1, and there is a concern that the wire rods constituting the outer shield layer 4 may be broken. As described in the present embodiment, by making the outer diameter of the second metal wire rod 42 made of copper or copper alloy larger than the outer diameter of the first metal wire rod 41 made of aluminum or aluminum alloy, the load due to the external force or the dead weight can be received by the second metal wire rod 42 having higher strength, and the occurrence of disconnection of the first metal wire rod 41 having lower strength can be suppressed.

Further, the first metal wire 41 made of aluminum or aluminum alloy has the following characteristics: is easily damaged, and if damaged, breakage is easily generated starting from the damage. The sheath 5 is formed by extrusion molding, but if the first wire 41 is damaged by interference with surrounding members or the like during movement (wire) when the sheath 5 is formed, breakage is likely to occur in the first wire 41 starting from the damage. In contrast, as described in the present embodiment, the outer diameter of the second metal wire rod 42 made of copper or copper alloy is made larger than the outer diameter of the first metal wire rod 41 made of aluminum or aluminum alloy, whereby the first metal wire rod 41 is disposed on the rear side of the second metal wire rod. That is, in the outer shield layer 4, in the cross section of the cable 1 shown in fig. 1 (a), the outer surface (=the surface facing the inner surface of the sheath 5) of the second metal wire 42 made of copper or copper alloy is likely to protrude in the radial direction of the cable 1 than the outer surface (=the surface facing the inner surface of the sheath 5) of the first metal wire 41 made of aluminum or aluminum alloy. As a result, the first metal wire 41 is also less likely to be damaged when the sheath 5 is formed, and the first metal wire 41 is less likely to be broken with the damage as a starting point. When a large load is applied to the outer shield layer 4, such as when an external force is applied to the cable 1 or when the cable 1 is bent, damage or the like to the first metal wire 41 due to contact between the sheath 5 and the outer shield layer 4 can be suppressed, and disconnection can be prevented from occurring in the outer shield layer 4 from this point.

Further, by making the outer diameter of the second metal wire 42 made of copper or copper alloy larger than the outer diameter of the first metal wire 41 made of aluminum or aluminum alloy, the proportion of copper (or copper alloy) in the outer shield layer 4 increases and the conductivity increases, so that the resistance against external noise also increases. In order to further improve the resistance against external noise, the braid density of the outer shield layer 4 is preferably 85% or more. In the present embodiment, the outer diameter of the first metal wire 41 made of aluminum or aluminum alloy is set to 0.16mm, and the outer diameter of the second metal wire 42 made of copper or copper alloy is set to 0.18mm.

The outer diameter of the first metal wire 41 made of aluminum or an aluminum alloy is, for example, 0.05mm or more and 0.40mm or less. The outer diameter of the second metal wire 42 made of copper or a copper alloy is, for example, 0.05mm or more and 0.40mm or less. In the first metal wire 41 and the second metal wire 42 having such outer diameters, the outer diameters of the wires 41 and 42 are selected so as to satisfy "the outer diameter of the first metal wire 41 < the outer diameter of the second metal wire 42". In particular, if the outer diameter of the second metal wire 42 is 1.0 times or more and 1.2 times or less larger than the outer diameter of the first metal wire 41, the above-described effects are easily obtained.

(inner shielding layer 8)

As shown in fig. 1 (c), the inner shield layer 8 is composed of a braided shield in which a plurality of third metal wires 81 composed of aluminum or an aluminum alloy and a plurality of fourth metal wires 82 composed of copper or a copper alloy are braided so as to intersect with each other, as in the outer shield layer 4 described above. This can further reduce the amount of copper used, realize a lighter and more flexible cable 1, and facilitate the connection of the inner shield layer 8 by soldering.

However, in the inner shielding layer 8, unlike the outer shielding layer 4 described above, the outer diameter of the third metal wire rod 81 made of aluminum or an aluminum alloy is preferably larger than the outer diameter of the fourth metal wire rod 82 made of copper or a copper alloy. As a result, the third metal wire rod 81 made of aluminum or an aluminum alloy that is relatively easy to deform functions to fill the gap between the metal wire rods 81, 82, and the resistance against external noise can be further improved. In order to further improve the resistance to external noise, the inner shielding layer 8 may have a braid density of at least 85% or more, and preferably has a higher braid density than the outer shielding layer 4.

In the present embodiment, in the inner shield layer 8, the outer diameter of the third metal wire rod 81 made of aluminum or an aluminum alloy is set to 0.16mm, and the outer diameter of the fourth metal wire rod 82 made of copper or a copper alloy is set to 0.12mm. As described above, in the present embodiment, in the outer shield layer 4, the outer diameter of the first metal wire 41 made of aluminum or aluminum alloy is set to 0.16mm, and the outer diameter of the first metal wire 41 made of aluminum or aluminum alloy is equal to the outer diameter of the third metal wire 81. Thus, a common aluminum wire or aluminum alloy wire can be used as the first metal wire 41 and the third metal wire 81, thereby realizing cost reduction.

As the first wire rod 41 and the third wire rod 81 are shared, the outer diameter of the second wire rod 42 is larger than the outer diameter of the fourth wire rod 82. The outer diameters of the first and third wires 41 and 81 are larger than the outer diameter of the fourth wire 82 and smaller than the outer diameter of the second wire 42. Thus, the following two expressions can be satisfied at the same time:

(outer diameter of the first metal wire 41) < (outer diameter of the second metal wire 42)

(outer diameter of third metal wire 81) > (outer diameter of fourth metal wire 82)

It is possible to suppress disconnection in the outer shield layer 4 and to improve the resistance to external noise in the inner shield layer 8, and it is possible to reduce the cost by sharing the first metal wire 41 and the third metal wire 81.

The outer diameter of the third metal wire rod 81 made of aluminum or an aluminum alloy is, for example, 0.05mm or more and 0.40mm or less. The outer diameter of the fourth metal wire 82 made of copper or a copper alloy is, for example, 0.05mm or more and 0.40mm or less. In the third metal wire rod 81 and the fourth metal wire rod 82 having such outer diameters, the outer diameters of the respective wire rods 81, 82 are selected so as to satisfy the above-described "outer diameter of the third metal wire rod 81 > outer diameter of the fourth metal wire rod 82". In particular, if the outer diameter of the third metal wire rod 81 is 1.0 times or more and 1.4 times or less larger than the outer diameter of the fourth metal wire rod 82, the above-described effects can be easily obtained.

(action and Effect of the embodiment)

As described above, in the cable 1 of the present embodiment, the outer shield layer 4 is constituted by the braided shield in which the plurality of first metal wires 41 constituted by aluminum or an aluminum alloy and the plurality of second metal wires 42 constituted by copper or a copper alloy are braided so as to intersect, and the outer diameter of the second metal wires 42 is larger than the outer diameter of the first metal wires 41. By using the plurality of first metal wires 41 made of aluminum or an aluminum alloy for the outer shield layer 4, the amount of copper used can be reduced, and the cable 1 which is low in cost, light in weight, and easy to bend can be realized. Further, by making the outer diameter of the second metal wire rod 42 made of copper or copper alloy larger than the outer diameter of the first metal wire rod 41 made of aluminum or aluminum alloy, it is difficult to cause breakage of the outer shield layer 4 due to the influence of external force or self weight. The present invention is particularly effective in a large-diameter cable 1, particularly a cable 1 having an outer diameter of 10mm or more, in which the amount of metal used in the outer shield layer 4 is large.

In the conventional composite cable using only a metal wire material composed of copper or a copper alloy for a shield layer, the cable is difficult to bend and the cable is heavy, so that there are problems such as difficulty in wiring, poor operability, difficulty in handling, and the like when the cable is laid. In contrast, according to the present embodiment, the amount of copper used in the outer shield layer 4 and the inner shield layer 8 can be reduced, and the lightweight cable 1 that is easily bendable and easily processed into a shape corresponding to the place to be laid can be realized by using aluminum or an aluminum alloy that is light and easily deformed.

(other embodiments)

In the above embodiment, the case where the cable core 3 has the inner shield layer 8 has been described, but the present invention is not limited thereto, and the inner shield layer 8 may be omitted. For example, as in the cable 1a shown in fig. 2, the cable core 3 may be a structure in which a plurality of wires 2 are twisted and a pressure-sensitive tape 10 is spirally wound around the wires, and may be a structure in which the inner shield layer 8 is not provided. The cable 1a includes a shield layer 4 covering the periphery of the cable core 3 and a sheath 5 covering the periphery of the shield layer 4. As shown in fig. 1 (b), the shielding layer 4 is constituted by a braided shield in which a plurality of first metal wires 41 made of aluminum or an aluminum alloy and a plurality of second metal wires 42 made of copper or a copper alloy are braided so as to intersect, the outer diameter of the second metal wires 42 being larger than the outer diameter of the first metal wires 41.

In the cable 1a shown in fig. 2, as in the cable 1 shown in fig. 1, the amount of copper used can be reduced, and occurrence of disconnection in the shield layer 4 due to the influence of external force and self weight can be suppressed. In the cable 1a, the filler 6 is provided in the center of the cable, but the present invention is not limited thereto. For example, the filler 6 may not be provided in the center of the cable. The electric wire 2 may be arranged in the center of the cable.

The electric wire 2 constituting the cable core 3 may include both a signal line for transmitting a signal and a power line for supplying power, or the signal line and the power line may be twisted to constitute the cable core 3. In fig. 2, the number of the electric wires 2 constituting the cable core 3 is 42, but the present invention is not limited thereto. That is, 1 or more electric wires 2 constituting the cable core 3 may be used. For example, in the case of a structure in which 1 wire 2 is arranged in the center of the cable, a coaxial cable in which a shield layer 4 and a sheath 5 are sequentially provided around 1 wire 2 is formed.

(summary of embodiments)

Next, the technical ideas grasped from the above-described embodiments will be described with reference to the symbols and the like in the embodiments. Note that the symbols and the like in the following description do not limit the constituent elements in the claims to the components and the like specifically shown in the embodiments.

[1] A cable 1 is provided with: a cable core 3 having 1 or more electric wires 2; a shielding layer 4 covering the periphery of the cable core 3; and a sheath 5 covering the periphery of the shielding layer 4, wherein the shielding layer 4 is formed of a braided shield in which a plurality of first metal wires 41 made of aluminum or an aluminum alloy and a plurality of second metal wires 42 made of copper or a copper alloy are braided so as to intersect, and the outer diameter of the second metal wires 42 is larger than the outer diameter of the first metal wires 41.

[2] The cable 1 according to [1], wherein the cable core 3 has an inner shield layer provided on an inner side of the shield layer 4 so as to cover the periphery of the electric wire 2, and the inner shield layer 8 is formed of a braided shield in which a plurality of third metal wires 81 made of aluminum or an aluminum alloy and a plurality of fourth metal wires 82 made of copper or a copper alloy are braided so as to intersect, and an outer diameter of the third metal wires 81 is larger than an outer diameter of the fourth metal wires 82.

[3] According to the cable 1 of [2], the outer diameter of the second metal wire 42 is larger than the outer diameter of the fourth metal wire 82, and the outer diameters of the first metal wire 41 and the third metal wire 81 are larger than the outer diameter of the fourth metal wire 82 and smaller than the outer diameter of the second metal wire 42.

[4] The cable 1 according to [2] or [3], wherein an outer diameter of the first metal wire 41 is equal to an outer diameter of the third metal wire 82.

[5] The cable 1 according to any one of [2] to [4], wherein a braid density of the shield layer 4 and the inner shield layer 8 is 85% or more.

[6] The cable 1 according to any one of [2] to [5], wherein a plurality of the electric wires 2 are arranged between the inner shielding layer 8 and the shielding layer 4.

[7] The cable 1 according to any one of [1] to [6], wherein the cable core 3 includes a signal line 21 for transmitting a signal and a power line 22 for supplying power as the electric wires 2.

The embodiments of the present invention have been described above, but the embodiments described above do not limit the invention of the claims. Further, it should be noted that a combination of all the features described in the embodiments is not necessarily essential to the solution to the problem of the invention. The present invention can be implemented by appropriately modifying the present invention within a range not departing from the gist thereof.

Claims (7)

1. A cable, comprising:

a cable core having 1 or more wires;

a shielding layer covering the periphery of the cable core; and

a sheath covering the periphery of the shielding layer,

the shielding layer is formed by a braided shielding member which is formed by braiding a plurality of first metal wires formed by aluminum or aluminum alloy and a plurality of second metal wires formed by copper or copper alloy in a crossing manner,

the second metal wire has an outer diameter larger than that of the first metal wire.

2. The cable of claim 1, wherein the cable comprises a plurality of conductors,

the cable core has an inner shielding layer which covers the periphery of the electric wire and is arranged on the inner side than the shielding layer,

the inner shielding layer is formed by a braided shield in which a plurality of third metal wires made of aluminum or an aluminum alloy and a plurality of fourth metal wires made of copper or a copper alloy are braided in a crossing manner,

the third metal wire has an outer diameter larger than that of the fourth metal wire.

3. The cable of claim 2, wherein the cable comprises a plurality of conductors,

the second metal wire has an outer diameter larger than that of the fourth metal wire,

the outer diameters of the first metal wire and the third metal wire are larger than the outer diameter of the fourth metal wire and smaller than the outer diameter of the second metal wire.

4. A cable according to claim 2 or 3, wherein,

the outer diameter of the first metal wire is equal to the outer diameter of the third metal wire.

5. The cable according to any one of claims 2 to 4, wherein,

the shielding layer and the inner shielding layer have a braid density of 85% or more.

6. The cable according to any one of claims 2 to 5, wherein,

the plurality of wires are disposed between the inner shield layer and the shield layer.

7. The cable according to any one of claims 1 to 6, wherein,

the cable core includes a signal line for transmitting a signal and a power line for supplying power as the electric wires.

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