JPH0850821A - Low conversation leakage type cable - Google Patents

Abstract

PURPOSE:To prevent mutual slipping of coupled stranded wires and lessen interference of conversation leakage by forming recessed and projected parts in stripes in the longitudinal direction of core wires on the surface of respective coatings of a plurality of core wires of low conversation leakage type cable. CONSTITUTION:A coupled standed wire 2A is produced by arranging core wires 3A, 3A with almost round cross-section and stranding them at proper pitches. Respective core wires 3A are composed of a conductive wire 5A of a metal and a coating 4A of an insulator to coat the outside of the wire 5A and recessed and projected parts in stripes in the longitudinal direction of the core wire are formed in the surface of the coating 4A. Attributed to the stripe-like recessed and projected parts on the surface of the core wire, friction affecting between neighboring core wires increases and thus mutual shifting of the coupled and stranded wires due to mutual slipping of core wires can be prevented. Consequently, the coupling and stranding pitch of the coupled standed wire 2A, the spiral structure formed by the core wires 3A, 3A, and the pitch structure of the cable core formed by stranding coupled stranded wires 2A are prevented from becoming disordered and regular and proper structure can be maintained, so that interference of conversation leakage can be lessened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a paired cable,
More specifically, it relates to a low crosstalk pair type cable that is less susceptible to crosstalk interference.

[0002]

2. Description of the Related Art Conventionally, as a cable for LAN (Local Area Network), a pair of twisted wires in which a pair of core wires are arranged and twisted at an appropriate pitch, or a multi-pair twisted wire in which many twisted wires are twisted together A pair type cable in which a required number of wire groups are bundled to form a cable core and a sheath (jacket) is applied to the whole, especially a low crosstalk type cable that is less susceptible to crosstalk interference and suitable for high-speed digital signal transmission Was commonly used. A solid plastic insulating material is used as a coating material for the core wire of the twisted pair wire and the multi-pair twisted wire group, and the insulation shape / structure of the core wire is generally a one-layer coating structure with a circular cross-sectional shape. Met.

[0003]

However, in the above-mentioned conventional low crosstalk pair type cable, when the core wire coated with one layer of polyethylene, which is a solid insulator, is twisted, the surface of the core wire is smooth. Therefore, there has been a problem that the twisted pair is twisted and the twisted pitch of the twisted pair is disturbed, or the twisted pair twists the regular spiral structure formed by each core.
In addition, when bundling twisted wires to form a cable core,
The pitch structure is disturbed due to the entanglement of twisted wires,
There was also a problem. If the disorder of the twisted pair pitch, the spiral structure of the core wire, the pitch structure of the cable core, etc. as described above increases, it becomes easy to receive crosstalk interference and it becomes difficult to speed up data transmission. The present invention has been made to solve the above problems, and an object of the present invention is to provide a low crosstalk pair type cable in which the twisted pair pitch of twisted pair wires, the spiral structure of core wires, and the like are less likely to be disturbed.

[0004]

In order to solve the above problems, in the low crosstalk pair type cable according to the first invention of the present application, a plurality of core wires formed by coating conductor wires with an insulating coating are arranged. In a low crosstalk pair type cable in which a required number of twisted pair twisted wires or a pair of twisted wire groups are bundled and a sheath is applied to the whole, a surface of each of the plurality of core wires is covered with a core wire. It is configured such that streaky unevenness is formed in the longitudinal direction. In addition, the low crosstalk pair type cable according to the second invention of the present application bundles a required number of twisted pair wires or twisted wire groups in which a plurality of core wires formed by covering conductor wires with an insulating coating are arranged and twisted. In the low crosstalk pair type cable in which the whole is collectively covered, the covering body of each of the plurality of core wires includes a foam insulating layer in the middle. The low crosstalk pair type cable according to the third invention of the present application bundles a required number of twisted pair wires or twisted wire groups in which a plurality of core wires formed by coating conductor wires with an insulating covering are arranged and twisted. ,
In a low-crosstalk pair type cable having a sheath as a whole, a foam insulating layer is formed on the surface of each cover of the plurality of core wires, and a core wire is formed on the surface of the foam insulating layer. It is configured such that streaky unevenness is formed in the longitudinal direction.
Further, the low crosstalk pair type cable according to the fourth invention of the present application,
In a low crosstalk pair type cable in which a required number of twisted pairs or twisted pairs of core wires in which conductor wires are covered with an insulating coating are arranged and twisted in pairs , Each of the plurality of core wires is formed in a quadrangular cross section. The low crosstalk pair type cable according to the fifth invention of the present application bundles a required number of twisted pair wires or twisted wire groups in which a plurality of core wires formed by coating conductor wires with an insulating coating is arranged and twisted. In a low crosstalk pair type cable having a sheath as a whole, a part of the covering body of each of the plurality of core wires is fused and the entire covering body is formed into a substantially spectacle-shaped cross-sectional shape. It

[0005]

According to the present invention having the above-mentioned structure, measures are taken to prevent the core wires forming the twisted pair in the low crosstalk pair type cable from slipping, and the mutual distance between the core wires is always constant. Since there is no measure to prevent the twisting of the twisted pair, the twisted pitch of the twisted pair, the spiral structure formed by the core wire, and the twisted pair are bundled together. Since the pitch structure of the formed cable core is not disturbed and the regular structure is maintained, crosstalk interference is reduced.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing the structure of twisted pair wires used in the first embodiment of the low crosstalk pair type cable according to the present invention.

As shown in the figure, this twisted pair wire 2A is formed by arranging two core wires 3A, 3A having a substantially circular cross section and twisting them at an appropriate pitch. Each core wire 3A is configured to include a conductor wire 5A made of metal or the like, and a cover 4A made of an insulator that covers the outside of the conductor wire 5A. Then, on the surface of each cover 4A, streaky unevenness is formed in the longitudinal direction of the core wire.

With the above construction, the friction between the core wires increases due to the stripe-shaped irregularities on the surface of the core wires, and the "twisting" does not shift due to the sliding of the core wires. The twisting pitch of the twisted pair wire 2A, the spiral structure formed by the core wires 3A and 3A, the pitch structure of the cable core formed by bundling the twisted pair wires 2A, etc. are not disturbed and a regular structure is maintained, so that crosstalk interference occurs. Is reduced.

Next, a second embodiment of the low crosstalk pair type cable according to the present invention will be described. FIG. 2 is a cross-sectional view showing the structure of twisted pair wires used in this low crosstalk pair type cable.

As shown in the figure, the twisted pair wire 2B is formed by arranging two core wires 3B, 3B having a circular cross section and twisting them at an appropriate pitch. Each core wire 3B includes a conductor wire 5B made of metal or the like and an insulating layer made of three layers that covers the outside of the conductor wire 5B. The innermost layer and the outermost layer of this insulating layer are formed of a covering body made of an insulating material, and the intermediate layer between the innermost layer and the outermost layer is formed of a foamed layer made of a foamed insulating material.

With the above construction, the elasticity of the surface of the core wire increases due to the interposition of the foamed layer, and it becomes easy to dent due to a slight force, so that the friction acting between the core wires increases and the sliding of the core wires causes The "twisted pair" does not shift, and accordingly, the twisted pair pitch of the twisted pair wire 2B, the spiral structure formed by the core wires 3B and 3B, the pitch structure of the cable core formed by bundling the twisted pair wire 2B, etc. Does not disturb and maintains a regular structure, thus reducing crosstalk interference.

Next, a third embodiment of the low crosstalk pair type cable according to the present invention will be described. FIG. 3 is a cross-sectional view showing a configuration of twisted pair wires used in the low crosstalk pair type cable.

As shown in the figure, this twisted pair wire 2C is an embodiment in which the above-mentioned first embodiment and second embodiment are combined,
Two cores 3C, 3C having a substantially circular cross section are arranged and twisted at an appropriate pitch. Each core wire 3C includes a conductor wire 5C made of metal or the like, and an insulating layer made of two layers that covers the outside of the conductor wire 5C. This insulating layer is composed of an inner layer 4C and an outer layer 6C, the inner layer 4C is formed of a cover made of an insulator, and the outer layer 6C is formed of a foam layer made of a foam insulator. Then, the surface of the outer layer 6C is provided with unevenness in the form of streaks in the longitudinal direction of the core wire.

With the above construction, the foam layer forming the outer layer 6C increases the elasticity of the surface of the core wire so that it can be easily dented by a minute force, and in addition, the presence of streaky irregularities on the surface of the core wire is combined. The friction between the core wires is increased, and the "twisted pair" is not displaced due to the sliding of the core wires, and accordingly, the twisted pair pitch of the twisted pair wire 2C and the spiral formed by the core wires 3C, 3C are formed. The structure, the pitch structure of the cable core formed by bundling the twisted pair wires 2C, and the like are not disturbed and the regular structure is maintained, so that the interference of crosstalk is reduced.

Next, a fourth embodiment of the low crosstalk pair type cable according to the present invention will be described. FIG. 4 is a cross-sectional view showing the structure of twisted pair wires used in this low crosstalk pair type cable.

As shown in the figure, the twisted pair wire 2D is formed by arranging two core wires 3D and 3D having a rectangular cross section and twisting them at an appropriate pitch. Each core wire 3D is configured to include a conductor wire 5D made of metal or the like, and a cover 4D made of an insulator that covers the outside of the conductor wire 5D.

With the above construction, the existence of the edge portion of the rectangular cross section of the cover 4D increases the friction acting between the core wires, and the "twisting" does not shift due to the slip between the core wires. With this, the twisted pair pitch of the twisted pair wire 2D,
Since the spiral structure formed by the core wires 3D and 3D, the pitch structure of the cable core formed by bundling the twisted pair wires 2D, and the like are not disturbed, and the regular structure is maintained, crosstalk interference is reduced.

Next, a fifth embodiment of the low crosstalk pair type cable according to the present invention will be described. FIG. 5 is a cross-sectional view showing a configuration of twisted pair wires used in the low crosstalk pair type cable.

As shown in the figure, in the twisted pair wire 2E, a part of each of the coverings of the two substantially circular cross-sections corresponding to the core wire is fused, and the entire covering is formed into a substantially spectacle-shaped cross-section. The formed core wires 3E are twisted together at an appropriate pitch. The core wire 3E is a conductor wire 5E, 5E made of metal or the like.
And a coating 4E made of an insulating material for coating the outside of the conductor wires 5E, 5E.

With the above construction, the center interval between the two substantially circular cross-section portions (the portions corresponding to the cores of the first to fourth embodiments) forming the spectacle-shaped cross section is always constant. The "twisted pair" does not shift, and accordingly, the twisted pair pitch of the twisted pair wire 2E, the spiral structure formed by two substantially circular cross-sections, the pitch structure of the cable core formed by bundling the twisted pair wire 2E, etc. Does not disturb and maintains a regular structure, thus reducing crosstalk interference.

Next, a sixth embodiment of the low crosstalk pair type cable according to the present invention will be described. FIG. 6 is a cross-sectional view showing the structure of this low crosstalk pair type cable.

As shown in the figure, this low crosstalk pair type cable 1F is formed by bundling a required number (four in this embodiment) of twisted pair wires 2F, which is one of the above twisted pair wires, as a cable core, A sheath 7F is applied to the entire body at once. Each twisted pair wire 2F is composed of one of the twisted pair wires shown in each of the above embodiments.

With the above construction, the "twisted pair" of the twisted pair wire is not displaced, and accordingly, the twisted pair pitch of the twisted pair wire 2F, the spiral structure formed by the core wire, and the twisted pair wire are bundled. Since the pitch structure and the like of the cable core formed as a result are not disturbed and a regular structure is maintained, crosstalk interference is reduced.

The present invention is not limited to the above embodiment. The above-described embodiment is an exemplification, and has substantially the same configuration as the technical idea described in the claims of the present invention, and any device having the same function and effect can be realized by the present invention. It is included in the technical scope of the invention.

For example, in the above-mentioned embodiment, as a means for preventing the deviation of the "twisted pair" of the twisted pair wires due to the sliding of the core wires or the like, an example in which streaky irregularities are formed on the outer surface of the core wires , An example of increasing the elasticity of the core wire surface by interposing a foam layer in the core wire covering body, a quadrangle core wire cross section to prevent the core wires from slipping due to edge resistance, and an overall cross sectional shape of a pair of core wires We explained the example of forming a pair of eyeglasses so that the mutual distance of the part corresponding to the core is always constant, but it is not limited to these, and the "twisting" of the twisted pair does not shift. , Any twisted pitch of twisted pair wire, spiral structure formed by core wires, pitch structure of cable core formed by bundling twisted wires, etc. is not disturbed and any structure and shape can maintain a regular structure -It may have a shape.

Further, in the above embodiment, the cable core of the pair type cable has been described by exemplifying a pair of twisted pair wires in which a pair of core wires are arranged and twisted at an appropriate pitch. However, the cable core may be formed by bundling a required number of multi-pair twisted wire groups in which a large number of twisted pair wires are twisted together.

[0027]

As described above, according to the present invention having the above-mentioned structure, measures are taken to prevent the core wires forming the twisted pair in the low crosstalk pair type cable from slipping, and Since measures have been taken to keep the mutual spacing between the wires constant, the "twisting" of the twisted pair does not deviate, and along with this, the twisting pitch of the twisted pair and the spiral formed by the core wire. The structure, the pitch structure of the cable core formed by bundling the twisted pair wires, and the like are not disturbed, and the regular structure is maintained, so that there is an advantage that crosstalk interference is reduced.

[Brief description of drawings]

FIG. 1 is a transverse cross-sectional view showing a configuration of twisted pair wires used in a low crosstalk pair type cable according to a first embodiment of the present invention.

FIG. 2 is a transverse cross-sectional view showing a configuration of twisted pair wires used in a low crosstalk pair type cable according to a second embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a configuration of twisted pair wires used in a low crosstalk pair type cable that is a third embodiment of the present invention.

FIG. 4 is a transverse cross-sectional view showing a configuration of twisted pair wires used in a low crosstalk pair type cable according to a fourth embodiment of the present invention.

FIG. 5 is a transverse cross-sectional view showing a configuration of twisted pair wires used in a low crosstalk pair type cable that is a fifth embodiment of the present invention.

FIG. 6 is a cross-sectional view showing the configuration of a low crosstalk pair type cable that is a sixth embodiment of the present invention.

[Explanation of symbols]

 1F Low crosstalk pair type cable 2A to 2F Pair twisted wire 3A to 3E Core wire 4A to 4E Cover body 5A to 5E Conductor wire 6B, 6C Foam layer 7F Collective sheath

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasufumi Kaga 5-1-1 Hidaka-cho, Hitachi City, Ibaraki Prefecture Hidaka Plant, Hitachi Cable, Ltd. (72) Kenji Ishii 5 Hidaka-cho, Hitachi City, Ibaraki Prefecture 1-1-1 Hitachi Cable Co., Ltd. Hidaka Plant (72) Inventor Masaru Abe 5-1-1 Hidakacho, Hitachi City, Ibaraki Hitachi Cable Co., Ltd. Hidaka Plant

Claims (5)

[Claims] 1. A required number of twisted pair wires or twisted wire groups in which a plurality of core wires formed by covering a conductor wire with an insulating coating are arranged and twisted in pairs, and a low-impedance coating is applied to the whole bundle. In the crosstalk pair type cable, the low crosstalk pair type cable is characterized in that the surface of the covering body of each of the plurality of core wires is formed with unevenness in the form of stripes in the longitudinal direction of the core wires. 2. A required number of twisted twisted wires or twisted wire groups in which a plurality of core wires formed by covering a conductor wire with an insulating covering are arranged and twisted in pairs, and the whole is covered with a jacket. In the crosstalk pair type cable, the covering body of each of the plurality of core wires includes a foam insulating layer in the middle thereof. 3. A required number of twisted twisted wires or twisted wire groups in which a plurality of core wires formed by covering a conductor wire with an insulating covering are arranged and twisted in pairs, and a low-strength wire is applied to the whole as a whole. In the crosstalk pair type cable, a foam insulating layer is formed on the surface of each covering body of the plurality of core wires, and on the surface of the foam insulating layer, unevenness that forms a streak in the longitudinal direction of the core wire is formed. A low crosstalk pair type cable characterized by that. 4. A required number of twisted pair wires or twisted wire groups in which a plurality of core wires formed by covering a conductor wire with an insulating coating are arranged and twisted in pairs, and the whole is covered with a sheath. In the crosstalk pair type cable, the low crosstalk pair type cable is characterized in that each of the plurality of core wires is formed into a rectangular cross section. 5. A required number of twisted pair wires or twisted wire groups, each of which is formed by arranging a plurality of core wires each of which is obtained by coating a conductor wire with an insulating coating and twisted the wires in pairs, and covering the whole with a jacket. In the crosstalk pair type cable, a low crosstalk pair type cable, characterized in that a part of a covering body of each of the plurality of core wires is fused and the entire covering body is formed into a substantially spectacle-shaped cross-sectional shape.