JP3681165B2 - communication cable - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a communication cable used for transmission between LANs, and more particularly to a communication cable in which four insulated wire cores are twisted into a star quad.
[0002]
[Prior art]
Conventionally, an 8-core twisted pair cable has been used as a communication cable for a LAN or a high-speed interface. The twisted pair cable is formed by twisting two insulated wire cores into a pair. It is configured to be accommodated in an outer coating made of plastic material such as polyvinyl chloride in a state where four sets are assembled, and two of the four sets are used for transmission / reception, mainly for high-speed data transmission as described above used. In addition, the star-shaped quad cable has a configuration in which four insulated wire cores are twisted in a star-shaped quad shape and accommodated in an outer sheath made of a plastic material such as polyvinyl chloride, and is mainly used as a local cable. .
[0003]
[Problems to be solved by the invention]
In the conventional communication cable, the twisted pair cable has a small crosstalk, but has a problem that it is difficult to secure a line space because of the four pairs of structures, and the star quad cable is a twisted pair cable. Although the outer diameter can be made smaller than that, there is a problem that crosstalk increases when quad collapse occurs due to bending or external stress.
[0004]
The present invention has been made in order to solve the above-described problems, and an object of the present invention is to propose a communication cable that can be easily handled and installed by reducing the storage volume, and prevents the occurrence of crosstalk and prevents crosstalk. .
[0005]
[Means for Solving the Problems]
The communication cable according to the present invention is formed by combining four insulated wire cores having an outer diameter of 0.2 to 0.8 mm with insulation coating and twisting them in a star quad shape with a twist pitch of 10 to 20 mm. In addition, an outer coating made of a thermoplastic resin is applied to the outside of the four insulated wire cores so as to fit into the star-shaped quad grooves formed by the four insulated wire cores. As described above, in the present invention, the twist pitch of the four insulated wire cores is reduced, and the outer coating made of the thermoplastic resin is narrowly inserted into the star-shaped quad groove formed by the four insulated wire cores. Therefore, even if an external force is applied, the collapse of the quad is prevented and the occurrence of crosstalk can be prevented and maintained. In addition, because it has a four-core and star-shaped quad shape, the outer diameter is extremely small. Compared to ordinary LAN cables, it is highly flexible and easy to handle. Easy wiring, smooth surface, small bundle volume and weight, convenient for carrying and storage.
[0006]
Moreover, the communication cable which concerns on this invention forms unevenness in the longitudinal direction in the surface of each insulated wire core as needed. As described above, in the present invention, since the unevenness is formed in the longitudinal direction on the surface of each of the four insulated wire cores, the unevenness on the surface of each of the four insulated wire cores is engaged with each other, and an external force is applied. Also, the collapse of the quad is prevented, and the occurrence of crosstalk can be significantly prevented and maintained.
Moreover, the communication cable which concerns on this invention roughens the surface roughness of the surface of the longitudinal direction of each insulated wire core as needed. As described above, in the present invention, since the surface roughness of the longitudinal surface of the four insulated wire cores is increased, the frictional force between the insulated wire cores works, and even if an external force is applied, the quad collapse is prevented. Thus, it is possible to prevent and maintain the occurrence of crosstalk.
[0007]
In addition, the communication cable according to the present invention is formed by changing the outer diameters of two of the four insulated wire cores located in the diagonal direction and the other two as necessary. As described above, in the present invention, the two outer diameters positioned in the diagonal direction of the four insulated wire cores are made smaller than the other two outer diameters. Even if two insulated wire cores having small outer diameters are fitted in two grooves formed by arranging the wire cores and an external force is applied, the quad collapse is prevented and the occurrence of crosstalk can be prevented and maintained. .
[0008]
In addition, the communication cable according to the present invention is formed by differentiating the hardness of two of the four insulated wire cores located in the diagonal direction and the other two as required. As described above, in the present invention, since the two hardnesses positioned in the diagonal direction of the four insulated wire cores are smaller than the other two hardnesses, the two insulated wire cores having a small hardness are provided. Even if two insulation wires with high hardness are embedded in each groove and the external force is applied to the two grooves formed by the arrangement, the quad collapse is prevented and the occurrence of crosstalk is prevented and maintained. can do.
Further, the communication cable according to the present invention fuses, bonds or adheres the four insulated wire cores as necessary. As described above, in the present invention, the four insulated wire cores are fused, bonded, or adhered, so that even if an external force is applied, resistance is generated and the quad collapse is prevented to prevent the occurrence of crosstalk. Can do.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment of the present invention)
Hereinafter, a communication cable according to a first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a sectional view of a communication cable according to this embodiment.
[0010]
In FIG. 1, the communication cable according to the present embodiment includes an insulated wire core 2 (for example, an outer diameter) made of a conductor 21 formed of soft copper (for example, a diameter of 0.5 mm) and an insulator 22 formed of polyethylene or the like. 0.8 mm) is twisted into a star-shaped quad shape with a twist pitch of 15 mm, and the four insulated wire cores 2 are formed with an outer covering 3 formed of an insulating material such as vinyl chloride. It is the composition of covering.
The outer covering 3 is configured to be narrowly inserted into a star-shaped quad groove formed from the four insulated wire cores 2 using a wire extruder die (not shown).
[0011]
Next, the forming operation of the communication cable according to the present embodiment will be described. The insulated wire core 2 is prepared by preheating the annealed copper conductor 21 at a temperature of about 80 to 100 ° C., and then using a screw extruder (not shown) having a die for an electric wire extruder. It is manufactured by heating and kneading and coating the preheated conductor 21 from a die for an electric wire extruder at a temperature of about 180 to 250 ° C. and a coating speed of 800 m / min to 2000 m / min.
The communication cable is manufactured by twisting the four insulated wire cores 2 into a star-shaped quad-shaped communication cable. This twisting is performed in order to balance the electrostatic coupling and electromagnetic coupling between the insulated wire cores 2 forming a pair. The twist pitch is set to 15 mm, and in order to reduce crosstalk between the insulated wire cores 2, This is performed by collecting four insulated wire cores 2 together. At this time, since the twist pitch is as short as 15 mm, the mutual position and the twist pitch due to the twist of the insulated wire core 2 are fixed without fluctuation.
A communication cable is formed by narrowing an outer covering 3 made of a thermoplastic resin such as polyvinyl chloride into a star-shaped quad-shaped groove formed by four insulated wire cores 2.
[0012]
As described above, according to the communication cable according to the present embodiment, the four insulated wire cores 2 form the outer coating 3 made of thermoplastic resin by reducing the twist pitch of the four insulated wire cores 2. Since the star-shaped groove is narrowly inserted, even if an external force is applied, the quad collapse is prevented and the occurrence of crosstalk can be prevented and maintained. In addition, because it has a four-core and star-shaped quad shape, its outer diameter is smaller, and it is more flexible and easier to handle than ordinary LAN communication cables. Easy wiring, smooth surface, small bundle volume and weight, convenient for carrying and storage.
[0013]
(Second embodiment of the present invention)
Hereinafter, a communication cable according to a second embodiment of the present invention will be described with reference to FIGS. FIG. 2 is a cross-sectional view of the communication cable according to the present embodiment, and FIG. 3 is a perspective view of the insulated wire core 2 in the communication cable according to the present embodiment.
[0014]
In FIG. 2, the communication cable according to the present embodiment is formed into a star-shaped quad by assembling four insulated wire cores 2 composed of the conductor 21 and the insulator 22 in the same manner as the communication cable according to the first embodiment. The four insulated wire cores 2 that are twisted together are covered with an outer coating 3, and in addition to this structure, the surface of the insulator 22 of each of the insulated wire cores 2 is uneven in the longitudinal direction (for example, 0 .01-0.1 mm groove) is formed.
The unevenness in each of the pair of insulated wire cores 2 is formed without maintaining the shape of a star-shaped quad without interfering with the uniformity of capacitance between the insulated wire cores 2 and the decrease in electromagnetic coupling, and without increasing crosstalk. To do.
[0015]
Next, the forming operation of the communication cable according to the present embodiment will be described. The insulated wire core 2 is a screw extrusion having a wire extruder die formed by preheating an annealed copper conductor 21 to a temperature of about 80 to 100 ° C., and then forming an uneven shape in the longitudinal direction of the material to be extruded next. The polyethylene resin composition is heated and kneaded using a machine and coated on the preheated conductor 21 from the die for the wire extruder at a temperature of about 180 to 250 ° C. and a coating speed of 800 m / min to 2000 m / min. It is manufactured by. FIG. 3 shows a perspective view of the insulated wire core 2 manufactured as described above.
Thereafter, it is formed in the same manner as the communication cable of the first embodiment.
As described above, according to the communication cable according to the present embodiment, since the surface of each of the four insulated wire cores 2 is formed to be uneven in the longitudinal direction, the surface of each of the four insulated wire cores 2 is uneven. Even if they are engaged with each other and an external force is applied, the collapse of the quad is prevented and the occurrence of crosstalk can be remarkably prevented and maintained.
[0016]
(Third embodiment of the present invention)
Hereinafter, a communication cable according to a first embodiment of the present invention will be described with reference to FIG. FIG. 4 shows a cross-sectional view of the communication cable according to the present embodiment.
In FIG. 4, the communication cable according to the present embodiment includes four insulated wire cores 2 each made up of a conductor 21 and an insulator 22 and twisted into a star-shaped quad, and the four insulated wire cores 2 twisted together. In addition to this configuration, the outer diameter of the two insulated wire cores 2a (for example, the outer diameter is 0.5 to 0.8 mm) located in the diagonal direction is covered with other insulation. It is the structure made smaller than the two outer diameters of the wire core 2b (for example, outer diameter is 0.75-1.2 mm).
The size of the outer diameter of each of the two insulated wire cores 2 is such that the shape of a star-shaped quad is maintained, so that the uniformity of capacitance between the insulated wire cores 2 and the decrease in electromagnetic coupling are not hindered, and crosstalk is prevented. Mold without increasing the size.
[0017]
Next, the forming operation of the communication cable according to the present embodiment will be described. In manufacturing the insulated wire core 2, the annealed copper conductor 21 is preheated to a temperature of about 80 to 100 ° C. in advance. Next, two types of wire extruder dies for extrusion molding so that the radii are different for each of the two insulated wire cores 2 positioned in the diagonal direction are prepared. The insulation wire core 2 is extruded using an attached screw extruder. More specifically, the preheated conductor 21 is coated with the polyethylene resin composition heated and kneaded at a temperature of about 180 to 250 ° C. and a coating speed of 800 m / min to 2000 m / min. Thus, two types of insulated wire cores 2a and 2b having different radii are manufactured.
[0018]
In the communication cable, the two insulated wire cores 2b are arranged in a diagonal direction, and the insulated wire cores 2a are arranged in two grooves 20a and 20b formed by the two insulated wire cores 2b. It is manufactured by twisting into a star-shaped quad in the state of being allowed to stand. This twisting is performed in order to balance the electrostatic coupling and electromagnetic coupling between the pair of insulated wire cores 2a and 2b. The twist pitch is set to 15 mm, and the crosstalk between the insulated wire cores 2a and 2b is reduced. In order to reduce it, four insulated wire cores 2a and 2b are assembled. At that time, since the twist pitch is as short as 15 mm, the mutual position and twist pitch due to twisting of the insulated wire cores 2a and 2b are fixed without fluctuation.
A communication cable is formed by narrowing an outer sheath 3 made of a thermoplastic resin such as polyvinyl chloride into a star-shaped quad groove formed by four insulated wire cores 2a and 2b.
[0019]
As described above, according to the communication cable according to the present embodiment, the outer diameters of the two insulated wire cores 2a located in the diagonal direction are smaller than the two outer diameters of the other insulated wire cores 2b. The two insulated wire cores 2a are fitted in the groove portions 20a and 20b with respect to the two groove portions 20a and 20b formed by the two insulated wire cores 2b. Can be prevented and maintained.
[0020]
(Fourth embodiment of the present invention)
Hereinafter, a communication cable according to a first embodiment of the present invention will be described with reference to FIG. FIG. 5 shows a cross-sectional view of a communication cable according to the present embodiment.
In the communication cable according to the present embodiment in FIG. 5, the four insulated wire cores 2 composed of the conductors 21 and the insulators 22 are gathered and twisted into a star-shaped quad shape, and the four insulated wire cores 2 that are twisted together. In addition to this configuration, the outer diameters of the two insulated wire cores 2a located in the diagonal direction are made smaller than the two outer diameters of the other insulated wire cores 2b, so that the insulation is provided. In this configuration, the hardness of the wire core 2a (for example, the hardness is 58 to 65) is made larger than the two hardnesses (for example, the hardness is 44 to 54) of the insulated wire core 2b.
The insulation wire cores 2a and 2b have a hardness and an outer diameter that maintain the shape of the star-shaped quad, so that the uniformity of the capacitance between the insulation wire cores 2 and the decrease in electromagnetic coupling are not hindered, and crosstalk is prevented. Mold without increasing the size.
[0021]
Next, the forming operation of the communication cable according to the present embodiment will be described. In manufacturing the insulated wire core 2, the annealed copper conductor 21 is preheated to a temperature of about 80 to 100 ° C. in advance. Next, two types of wire extruder dies for extrusion molding so that the radii are different for each of the two insulated wire cores 2 positioned in the diagonal direction are prepared. The insulated wire core 2 is extruded by using two attached screw extruders. More specifically, two polyethylene resin compositions are used so that the hardness after curing is different on the preheated conductor 21 at a temperature of about 180 to 250 ° C. and a coating speed of 800 m / min to 2000 m / min. Two types of insulated wire cores 2a and 2b having different radii and hardness are manufactured by covering with a die for an electric wire extruder of each screw extruder that encloses an object.
[0022]
In the communication cable, the two insulated wire cores 2b are arranged in a diagonal direction, and the respective insulated wire cores 2a are embedded in the two grooves 20a and 20b formed by the two insulated wire cores 2b. It is manufactured by twisting it into a star-shaped quad in the state of entering. This twisting is performed in order to balance the electrostatic coupling and electromagnetic coupling between the pair of insulated wire cores 2a and 2b. The twist pitch is set to 15 mm, and the crosstalk between the insulated wire cores 2a and 2b is reduced. In order to reduce it, four insulated wire cores 2a and 2b are assembled. At that time, since the twist pitch is as short as 15 mm, the mutual position and twist pitch due to twisting of the insulated wire cores 2a and 2b are fixed without fluctuation.
A communication cable is formed by narrowing an outer sheath 3 made of a thermoplastic resin such as polyvinyl chloride into a star-shaped quad groove formed by four insulated wire cores 2a and 2b.
[0023]
As described above, according to the communication cable according to the present embodiment, the outer diameters of the two insulated wire cores 2a located in the diagonal direction are made smaller than the two outer diameters of the other insulated wire cores 2b, and the diagonal is obtained. Since the hardness of the two insulated wire cores 2a positioned in the direction is larger than the two hardnesses of the other insulated wire cores 2b, the two insulated wire cores 2b formed by arranging the two insulated wire cores 2b Two insulated wire cores 2a are embedded in each groove with respect to the groove portions 20a and 20b, and even if an external force is applied, the collapse of the quad is prevented and the occurrence of crosstalk can be prevented and maintained.
[0024]
(Other embodiments)
In addition, in the communication cable which concerns on each said embodiment, when extruding the insulated wire core 2 from the die | dye for electric wire extruders, by changing the resin composition to which the coating speed fluctuation | variation or heating kneading | mixing, The roughness of the surface (for example, the surface roughness is 0.03 to 0.12 μm) can be changed, and the frictional force between the four insulated wire cores 2 is increased so that even if an external force is applied, the quad collapses. Can be prevented and the occurrence of crosstalk can be prevented and maintained. FIG. 6 is a perspective view of the insulated wire core 2 with the roughness changed.
[0025]
Further, in the communication cable according to each of the above embodiments, the outer periphery of the communication cable is partially made of paper, woven cloth or the like before being covered with the outer coating 3 made of thermoplastic resin such as polyvinyl chloride. It can also be wound with tape.
In addition, in the communication cable according to each of the above embodiments, before the four insulated wire cores 2 are twisted, the four insulated wire cores 2 may be heated to about 200 ° C. and fused in a star-shaped quad shape. it can.
In the communication cable according to each of the above embodiments, the four insulated wire cores 2 can be bonded in a star quad shape with an adhesive before the four insulated wire cores 2 are twisted together.
[0026]
Moreover, in the communication cable according to each of the above embodiments, the insulator 22 can be formed by kneading polyethylene and an adhesive, and the insulated wire core 2 made of the insulator 22 can have adhesiveness.
In the communication cable according to each of the above embodiments, the clearance between the outer sheath 3 and the star quad formed from the four insulated wire cores 2 can be set to 0 to −0.2 mm.
In addition, in the communication cable according to each of the embodiments, the inclusion 4 having a circular shape, a rectangular shape, or the like can be inserted into the center of the star-shaped quad formed from the four insulated wire cores 2. Furthermore, unevenness can be formed in the longitudinal direction on the surface of the inclusion 4 or the hardness of the inclusion 4 can be changed. FIG. 7 is a cross-sectional view of the communication cable with the inclusion 4 inserted therein.
[0027]
Moreover, in the communication cable which concerns on the said 2nd Embodiment, although the unevenness | corrugation was shape | molded in the longitudinal direction in the surface of the insulated wire core 2, it can also be set as the structure which can make a cut instead of an unevenness | corrugation.
Further, in the communication cable according to the fourth embodiment, the insulated wire cores 2a and 2b have different outer diameters, but the insulated wire cores 2a and 2b have the same outer diameter, and the insulated wire cores 2a and 2b Only the hardness of 2b can be varied.
[0028]
【The invention's effect】
As described above, in the present invention, the twist pitch of the four insulated wire cores is reduced, and the outer coating made of thermoplastic resin is narrowly inserted into the star-shaped quad groove formed by the four insulated wire cores. Therefore, even if an external force is applied, the quad collapse is prevented, and it is possible to prevent and maintain the occurrence of crosstalk. In addition, because it has a 4-core and star-shaped quad shape, it has a smaller outer diameter, and is more flexible and easier to handle than ordinary LAN communication cables, has a smooth surface, and has a bundle volume and weight. Both are small and convenient to carry and store.
[0029]
Further, in the present invention, since the unevenness is formed in the longitudinal direction on the surface of each of the four insulated wire cores, even if the unevenness on the surface of each of the four insulated wire cores is engaged with each other, an external force is applied. The collapse of the quad is prevented, and it is possible to significantly prevent and maintain the occurrence of crosstalk.
Further, in the present invention, since the surface roughness of the longitudinal surface of the four insulated wire cores is increased, the frictional force between the insulated wire cores works, and even if an external force is applied, the quad collapse is prevented. Thus, it is possible to prevent and maintain the occurrence of crosstalk.
[0030]
Further, in the present invention, the two outer diameters positioned in the diagonal direction of the four insulated wire cores are made smaller than the other two outer diameters, so that the two insulated wires having a larger outer diameter are used. Even if two insulated wire cores with small outer diameters are fitted in the two grooves formed by the arrangement of the cores and an external force is applied, the quad collapse is prevented and the occurrence of crosstalk can be prevented and maintained. Has an effect.
Further, in the present invention, the two hardnesses positioned in the diagonal direction of the four insulated wire cores are made smaller than the other two hardnesses, so that two insulated wire cores having a small hardness are arranged. As a result, even if two insulated wires having high hardness are embedded in each groove and an external force is applied to the two grooves formed, the quad collapse is prevented and the occurrence of crosstalk is prevented and maintained. It has the effect of being able to.
In the present invention, since the four insulated wire cores are fused, bonded or adhered, even if an external force is applied, resistance is generated and the quad collapse is prevented, thereby preventing the occurrence of crosstalk. It has the effect of being able to.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a communication cable according to a first embodiment of the present invention.
FIG. 2 is a cross-sectional view of a communication cable according to a second embodiment of the present invention.
FIG. 3 is a perspective view of an insulated wire core in a communication cable according to a second embodiment of the present invention.
FIG. 4 is a cross-sectional view of a communication cable according to a third embodiment of the present invention.
FIG. 5 is a cross-sectional view of a communication cable according to a fourth embodiment of the present invention.
FIG. 6 is a perspective view of an insulated wire core in a communication cable according to another embodiment of the present invention.
FIG. 7 is a cross-sectional view of a communication cable according to another embodiment of the present invention.
[Explanation of symbols]
2, 2a, 2b Insulated wire core 21 Conductor 22 Insulator 3 Outer coating 4 Inclusions 20a, 20b Groove

Claims (6)

A combination of four insulated wire cores coated with a conductor having an outer diameter of 0.2 to 0.8 mm, twisted into a star-shaped quad with a twist pitch of 6 to 20 mm, and the four twisted insulated wire cores A communication cable, characterized in that an outer coating made of a thermoplastic resin is provided on the outside so as to be inserted into the star-shaped quad groove formed by the four insulated wire cores. The communication cable according to claim 1,
A communication cable characterized by forming irregularities in the longitudinal direction on the surface of each insulated wire core. In the communication cable according to claim 1 or 2,
A communication cable characterized by roughening the surface roughness of the longitudinal surface of each insulated wire core. The communication cable according to any one of claims 1 to 3,
2. A communication cable, wherein two of the four insulated wire cores located in a diagonal direction and the other two are formed with different outer diameters. The communication cable according to any one of claims 1 to 4,
A communication cable, wherein the two insulated wire cores positioned in the diagonal direction and the other two are formed with different hardnesses. The communication cable according to any one of claims 1 to 5,
A communication cable characterized in that the four insulated wire cores are fused, bonded or adhered.

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