JPS63102112A - Pair-twisted under carpet cable - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the structure of an undercarpet cable for communication that has good resistance to induced noise from power lines and the like and IC crosstalk characteristics.

[Conventional technology]

The fifth factor is the structural diagram of a conventional undercarpet cable used for indoor carpet underlines. In Figure 5, 1 is an insulated core wire, J-J is a conductor, 1-2 is a plastic insulator such as polyethylene or polyvinyl chloride, 2 is a pair consisting of two insulated core wires, and 3 is a polyvinyl chloride wire. Reinforced molding materials such as

4 is a 2-laminated aluminum nap that is made by laminating a plastic film on an aluminum nap.

In general, these communication flat cables must (1) satisfy the requirements for electrical characteristics, and (2) be as thin as possible so that they are not noticeable when wiring under the carpet.
It is generally said to be 3u or less. ), (3) since multiple pairs are arranged in parallel, it is difficult to planar wiring, and it is required to be able to be wired by bending, and (4) it is required to withstand compressive loads from above the carpet.

For this reason, the 1-1 conductor usually has 0.4 to 0.51 t.
Mechanically strong high-density polyethylene is used for the plastic insulator of +aφO copper single wire, No. 2, and as shown in Fig. 5, two insulated core wires 1 are arranged in parallel in close contact and reinforced with molded material 3. In many cases, the cable is covered with a laminated aluminum tape 4 and has a thickness of 1 to 1.5 nm.

In order to obtain as large a compressive load resistance as possible, even in the case of folded wiring, the insulated core wires are avoided from directly overlapping each other, and the thickness of the nine parts of the cable is approximately 3WR.
This is because the following is considered. Also, 4
The laminated aluminum tape provides reinforcement against the load from above the carpet, and also serves as a hollow body that prevents crosstalk between adjacent pairs and noise induced from the outside.

[Problem that the invention seeks to solve]

Conventional undercarpet cables are designed with emphasis on cable thickness, compressive load resistance, and wiring workability, and are therefore superior in these respects. However, on the other hand, because it has a structure in which insulated core wires are arranged in parallel, compared to twisted pair or star quad twisted communication cables that have been traditionally used for communication trunk lines such as subscriber and relay cables, (
1) Wiring is often done in parallel indoors, making it susceptible to induced noise from power lines.

(2) There was a drawback that the crosstalk characteristics between adjacent pairs were poor.

For this reason, in high frequency bands of several tens of kilohertz (KH2) or more, where problems with induced noise from the outside and crosstalk characteristics are noticeable, there is a problem in that there are significant limitations in terms of separation distance from the power supply line, applicable cable length, etc.

One possible way to solve these problems is to apply twin-twisting to undercarpet cables as well.
Conventional twisted pair communication cables have a twist pitch of 20 to Bo1.
Since the cables are twisted tightly at approximately iK, there is a problem in that even if they are applied to undercarpet cables, the compressive load resistance of the twisted portions deteriorates, making them unsuitable for practical use. In addition, the thickness of a twisted pair cyan goo carpet cable is expected to be about 1.5 times the thickness of a conventional cable, but in the part where the cable is folded due to bending wiring, the thickness will be 2 times more than that of a conventional cable. Since it is twice as large, there was a problem that it was noticeable even from the carpet.

The purpose of the present invention is to improve the characteristics of induced noise from power lines, etc.

To improve crosstalk characteristics, to provide an undercarpet cable (nine-pair twisted) which has excellent load-bearing characteristics and which allows folded cables to have the same thickness as conventional cables even in folded wiring.

[Means for solving problems]

In order to achieve the object, the present invention provides an undercarpet cable for communication, which is constructed by arranging multiple pairs of insulated core wires substantially parallel to each other, using conductors such as copper wire, flexible copper stranded wire, or enamelled copper wire. The insulated core wire is coated with a plastic insulator containing an amide lubricant, etc., and the insulated core wire is
Each pair is twisted at a twisting pitch of 100 to 150 tow or more to form a pair, and the outer periphery of the pair is covered with a thin inner plastic sheath having an inner diameter slightly larger (twice the outer diameter of the insulated core wire). Twisted Paired Cyan Goo Carpet Cable O [Function] In accordance with the above-mentioned means, the present invention employs a twisted pair structure in the undercarpet cable, so that it is possible to significantly reduce induced noise from power lines, etc. It is also possible to improve the crosstalk characteristics from cables, expanding the range of applications that was previously limited by cables. In addition, the conductor is made of stranded wire or enamel plated wire, and a lubricant is added to the plastic insulator to make it slippery, and the twist pitch of the insulated core wire is increased to 100 to 150111 or more. The cable has a structure in which the twisting position of the pairs can easily move in the longitudinal direction of the cable.Although it is a cable with a twisted pair structure, its compressive load resistance and cable thickness at the bent wiring section are lower than that of conventional cables. It can be done almost equivalently.

〔Example〕 Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, in which 5 is a thin inner plastic sheath. In Figure 1, the conductor 1-1 is a copper wire (JISC3102) or a flexible copper stranded wire (JC8
222), the insulated core wire 1 is formed using an enameled copper wire (JI8C3202), etc., and a plastic insulator such as polyvinyl chloride or polyethylene to which an amide lubricant is added for the Plus Deck insulator 1-2. . Pair 2 is made up of two insulated core wires and twisted at a twisting pitch of 100 to 150 or more. At this time, adjacent pairs are made to have different twisting pitches. The thin inner plastic sheath 5 is a polyvinyl chloride or polyethylene sheath with an inner diameter slightly larger than twice that of the insulated core wire 1 and a thickness of about 0.1 to 0.3 nm.
It may be added with the same lubricant as the plastic insulator 1-2.

Laminated aluminum tape 4 has a thickness of 0.01 to 0.05m
It is made by laminating a plastic film on aluminum tape, and is integrally adhered to the thin inner plus deck sheath 5. The laminated aluminum tape 4 can be replaced with a plastic tape made of polyvinyl chloride or the like if the undercarpet cable does not require a metal barrier.

Next, the effects of having such a twisted pair structure will be described.

(1) Effect of improving electrical characteristics Figure 2 shows the impulse induced from the power line to the undercarpet cable when a conventional undercarpet cable with parallel insulated core wires and a twisted pair undercarpet cable are wired near the power line. These are the results of measuring sexual noise.

The twist-paired cyan goo carpet cable is approximately 10 d longer than the conventional cable with laminated aluminum tape (Figure 5).
B. Compared to conventional cables without veneated aluminum tape, a noise reduction effect of 20 to 30 dBO can be obtained.

Next, FIG. 3 shows the results of measuring the coupling coefficient of induced noise with the power supply line when the twisting pitch was changed for a cable without laminated aluminum tape. In FIG. 3, the noise voltage vx induced from the power supply line to the undercarpet cable is given by the following equation (1).

Vx= (to KIA+, LωV,...
・・・・・・・・・ (1) Here, Kl # Kl: Coefficient determined by angular frequency, line constant of power line; Capacitive coupling coefficient Lm; Electromagnetic coupling inductance ■,; Noise voltage of power line Figure 3 Okay, some electrostatic coupling between the power supply line and the twisted twin carpet cable, the electromagnetic coupling inductance Lm is,
If the twist pitch is about 1 m or less, the twist pitch will be about 17,100, compared to a conventional undercarpet cable without twists. Therefore, it can be seen that the induced noise voltage is also significantly reduced.

As for the crosstalk characteristics between adjacent pairs, by twisting the cables, the crosstalk attenuation is improved by about 30 dB even in cables without laminated aluminum tape, compared to conventional cables with laminated aluminum tape without twisting.

(1) Effect on compressive load resistance characteristics Generally speaking, the most severe compressive loads from carpets are the trampling loads caused by people's heels and the loads caused by the legs of office equipment such as desks and chairs. The axial compression range is 1
In this example, most of the cases are 00++n or less, (7) the twisting pitch of the pairs is 100 to 150 degrees or more, and the twisting is loose in advance; (a) a lubricant is added to the plastic insulator. (When monoamide is added to polyvinyl chloride, the coefficient of static friction is reduced by half compared to when no lubricant is added.)
The inner diameter of the thin inner plastic sheath is slightly thicker than twice the outer diameter of the insulated core to allow for easy movement of the insulated core in the circumferential direction (radial movement is restricted). ), the structure allows the twisting position of the pair to vary easily in the cable axial direction. Therefore, as mentioned above, the length is 1
When a compressive load is applied in a range of about 00n, the twisted position of the pair immediately moves, and the insulated core wires are arranged in parallel under the compressive load.

This shows that even a twisted pair cable using ordinary copper wires can have compressive load resistance characteristics equivalent to a conventional undercarpet cable with insulated core wires arranged in parallel.

In addition, when flexible copper stranded wire is used for the conductor 1-1, even if a compressive load is applied to the intersection of the insulated core wires on the temporary wire, the conductor at that part easily deforms, so the plastic insulator 1-1
2 can be alleviated from breaking, while conductor 1-I
When using K-enamel-plated copper wire, even if the plastic insulator 1-2 were torn due to compressive load, the insulation would be maintained by the enamel plating, so it would not be possible to use the conventional single copper wire (J
Cables using I8C3102) also have improved compressive load resistance.

(III) Effect of reducing the thickness of the cable bend wiring section The logarithm of undercarpet cables for communication is usually 10.
The maximum cable width is about 70 to 80 mm. Therefore, the length of the cable at one point where it is bent and wired is 100 mm or less.

FIG. 4 is a state diagram of the twisted pairs of insulated core wires in the bent cable wiring section of this embodiment, and 6 is the cable bent section. As mentioned in Section 13 above, the cable of this embodiment has a twisting pitch of 100 to 150f1 or more, and has a structure in which the twisting position can be easily moved. It is possible to perform the bending after moving the twisting wire to another part that will not be bent.By doing this, the overlapping wires of the insulated core wires at the cable bending part 6VC can be removed by two folds.
It can be made into a book, and no more than three insulated core wires overlap. Therefore, the thickness can be made to be approximately the same as that of the bent portion of a conventional insulated core cable arranged in parallel. Note that since the thin inner plastic sheath 5 is flattened by a slight pressing force, the thin inner plastic sheath 5 does not become a factor in increasing the thickness of the cable folded portion.

〔Effect of the invention〕

As explained above, in the present invention, since the undercarpet cable has a twisted pair structure, it is possible to significantly reduce alligator conduction noise from power lines, etc., and also improve crosstalk characteristics from one adjacent pair. It can expand the range of applications that was previously limited by cables.In addition, the conductor uses stranded wire or enamel plated wire, and a lubricant is added to the Plus Deck insulator to make it slippery. and 1
Because the twisting pitch of the insulated core wires is large, at 100 to 150W or more, the twisting position of the pairs can easily move in the longitudinal direction of the cable. First, it has the advantage that the compressive load resistance and the cable thickness of the bent wiring section are almost the same as conventional cables.

Conventionally, undercarpet cables with a twisted pair structure have not been found. In addition, compared to conventional twin-twist or star-quad twisted communication cables, the twisting pitch is 5 to 10 times larger, and a lubricant-added plastic insulator is applied to the insulated core wire, so that the twisting position is in the longitudinal direction. The difference is that it actively makes it easier to fluctuate.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of the present invention, and Fig. 2 shows an example of measurement results of noise generated from the power line to the undercarpet cable when the undercarpet cable is routed parallel to the power line. The characteristic diagram, Figure 3, shows an example of the electrostatic coupling coefficient and electromagnetic coupling inductance measurement results between the power supply line and the undercarpet cable when the undercarpet cable chained with laminated aluminum tape is wired in the same way as in Figure 2. FIG. 4 is a diagram showing the twisted state of the insulated core wires of the bent wiring section of the undercarpet cable in FIG. 1, and FIG. 5 is a perspective view of the conventional undercarpet cable. DESCRIPTION OF SYMBOLS 1... Insulated core wire, 1-1... Conductor, 1-2... Plastic insulator, 2... Pair, 3... Reinforcement molding material,
4... Laminated aluminum tape, 5... Thin inner plus deck sheath, 6... Cable bending part.

Claims (1)

[Claims] In undercarpet cables for communication, which are constructed by arranging multiple pairs of insulated core wires approximately in parallel, plastic insulators are made by adding amide lubricants to conductors such as copper wire, flexible copper strands, and enameled copper wire. Two insulated core wires are twisted together at a twisting pitch of 100 to 150 mm or more to form a pair. A twin-strand undercarpet cable characterized by being coated with a thin inner plastic sheath.