JP2003077346A - Coaxial cable with two parallel cores - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coaxial cable with two parallel cores easy to identify the polarity of cores even when it is thin. SOLUTION: For the coaxial cable with two parallel cores 1, two cores 2a, 2b formed by covering the periphery of an inner conductor 7 by insulation material 8 are arranged in parallel, and the outer periphery of the cores 2a, 2b is covered by an outer conductor 3, and outer periphery of the outer conductor 3 is covered by a jacket 4 made of insulating material 8. The jacket 4 is made transparent and a polarity marking tape 5 is put between the jacket 4 and the outer conductor 3 along the cores 2a, 2b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-core parallel coaxial cable connected to a liquid crystal screen or the like.

[0002]

2. Description of the Related Art As shown in FIG.
A two-core parallel coaxial cable 50 used for a quid crystal display has two cores 2a and 2b colored in different colors so that the polarities can be identified by the colors.

[0003]

However, in the two-core parallel coaxial cable 50, the size of the inner conductor 7 is 36A.
There is a WG (American Wire Gauge), that is, an extra fine one having an outer diameter of about 0.15 mm or less.
There is a problem that it is difficult to identify the color of 2b.

For example, when seven strands having a diameter of 0.03 mm are twisted together, the outer diameter of the inner conductor 7 is about 0.09 mm.
(40 AWG) and the insulator 8 is 0.06 mm
The core diameter is 0.21 mm, which is very thin.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and to provide a two-core parallel coaxial cable which can easily identify the polarity of the core even if it is thin.

[0006]

In order to achieve the above-mentioned object, the present invention arranges two cores, which are formed by coating an outer periphery of an inner conductor with an insulator, in parallel, and the outer periphery of these two cores is arranged. In a two-core parallel coaxial cable which is covered with an outer conductor and a jacket made of an insulator is covered on the outer circumference of the outer conductor, the jacket is transparently formed and the polarity of the core is displayed between the jacket and the outer conductor. The marking tape for doing so is provided along the core.

[0007] Further, it is further preferable that the marking tape has a mark for indicating the direction of connection.

The outer diameter of the inner conductor is preferably 0.15 mm or less.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, a two-core parallel coaxial cable 1 includes two cores 2a and 2b arranged in parallel and two cores 2a and 2b.
An outer conductor 3 that covers the outer circumferences of the cores 2a and 2b so as to bundle the cores 2a and 2b, a jacket 4 that covers the outer circumferences of the outer conductor 3 and is made of an insulator, and is provided between the jacket 4 and the outer conductor 3. The marking tape 5 for displaying the polarities of the cores 2a and 2b.

Each of the cores 2a and 2b comprises an inner conductor 7 formed by twisting six strands 6 around one strand 6, and an insulator 8 coated on the outer periphery of the inner conductor 7.

The cores 2a and 2b are formed in the same color, and their polarities are identified by the above-mentioned marking tape 5. The cores 2 a and 2 b are formed in a color that makes the color of the marking tape 5 stand out over the outer conductor 3.

The outer conductor 3 is formed by horizontally winding a large number of strands (not shown) at a predetermined pitch so as to shield the cores 2a and 2b.

The jacket 4 is made of a polyester tape (not shown) wound around the outer conductor 3 and is transparent so that the marking tape 5 can be seen through the jacket 4.

The marking tape 5 is formed in a prominent color such as red or blue, and is provided so as to be vertically attached to the side of one core 2b, that is, the back side of the side in contact with the other core 2a. .

The marking tape 5 has a mark 9 on the outer side in contact with the jacket 4 for indicating the direction of connection. The mark 9 is composed of an arrow-shaped straight line mark and is printed on the marking tape 5.

The width of the marking tape 5 is determined so that the jacket 4 becomes a lens and extends to the side of the other core 2a so as not to be seen when seen through from above the jacket 4, and that it is sufficiently conspicuous. There is. Specifically, the inner conductor 7
The width is about the same as the diameter.

Further, the marking tape 5 is formed such that the thickness of the marking tape 5 becomes thinner toward both sides,
In the manufacturing process in which the outer conductor 3 is wound around the tape of the jacket 4, the outer surface 10 is smoothly connected to the outer peripheral surface of the outer conductor 3 so that a cavity is not formed between the tape of the jacket 4 and the outer conductor 3. It has become.

By not forming cavities on both sides of the marking tape 5, it is possible to prevent deterioration of the quality of the two-core parallel coaxial cable 1 and to prevent the color of the marking tape 5 from becoming difficult to see due to the cavities. ing.

Next, the operation will be described.

When wiring the two-core parallel coaxial cable 1,
The polarities of the side with the marking tape 5 and the side without the marking tape 5 are determined in advance, and wiring is performed according to this rule.

The polarities of the cores 2a and 2b are determined depending on whether the marking tape 5 is on the left or right when the two-core parallel coaxial cable 1 is viewed from the flat surface 11.

At this time, since the jacket 4 is formed transparent, the marking tape 5 can be seen through without stripping and the polarities of the cores 2a and 2b can be easily determined.

Further, since the material of the marking tape 5 is determined with a comparatively strong emphasis on color developability, the color difference can be easily visually confirmed even with the extra-fine two-core parallel coaxial cable 1. The polarities of the cores 2a and 2b can be easily determined.

Then, the jacket 4 is stripped and the internal conductors 7 of the cores 2a and 2b are connected to predetermined positions.

In this way, the insulator 8 is provided on the outer periphery of the inner conductor 7.
Two cores 2a, 2b which are coated with each other are arranged in parallel, the outer circumferences of these two cores 2a, 2b are covered with an outer conductor 3, and the outer circumference of the outer conductor 3 is covered with a jacket 4 made of an insulator. In the two-core parallel coaxial cable 1, the jacket 4 is transparently formed, and the marking tape 5 for indicating the polarity of the cores 2a and 2b is provided between the jacket 4 and the outer conductor 3 along the cores 2a and 2b. Because it was set up,
The cores 2a, 2
The polarity of b can be easily identified.

In particular, since the marking tape 5 is located between the jacket 4 and the outer conductor 3, there is no fear of peeling off unlike the case where the marking tape 5 is provided on the jacket 4. Also, when printing on a thin jacket 4, extremely advanced technology is required,
Although it is impossible depending on the thinness, since the marking tape 5 is attached to the outer conductor 3 and the tape of the jacket 4 is only wound, even the extra-fine two-core parallel coaxial cable 1 can be easily used for polarity identification. Mark can be provided.

The marking tape 5 is attached to one core 2b.
Since the cores 2a and 2b are provided so as to be vertically attached, it is only necessary to distinguish whether the cores 2a and 2b are colored next to each other, and the polarities of the cores 2a and 2b can be more easily identified.

Since the marking tape 5 indicates the polarity, the cores 2a and 2b of the same color can be used.

Although the marking tape 5 is arranged beside one core 2b, it may be arranged at another position as long as the cores 2a and 2b can be identified.

For example, as shown in FIG. 2, the marking tape is such that the outer conductor 3 is vertically attached to one of the two flat surfaces 20 formed between the cores 2a and 2b. 5 may be provided.

In this case, the polarities of the cores 2a and 2b can be identified depending on whether the cores 2a and 2b are positioned on the left or right side of the identification tape 5.

The mark 9 on the marking tape 5 is not limited to a straight line mark, and may be another mark as long as it can indicate the direction of connection.

For example, as shown in FIG. 3, a triangular dot mark 30 may be used, or a mark (not shown) that makes a triangle, an arrow, or the like image at a plurality of points may be formed.

Although the jacket 4 is made of polyester tape, the present invention is not limited to this, and the jacket 4 is made of polyvinyl chloride, polyethylene, or the like.
It may be made of other material such as polypropylene, or may be formed by extrusion.

Further, as shown in FIG. 4, the marking tape 4
0 is formed wider than the above-mentioned one, and the reflection suppressing portions 41 of a color that suppresses reflection such as black are formed on both sides, and the color marker indicating the polarity of the cores 2a and 2b is sandwiched between the reflection suppressing portions 41. The part 42 may be formed.

Reflection of the outer conductor 3 and refracted light in the jacket layer 43 can be suppressed, and the color for identifying the core can be more easily visually confirmed.

[0038]

In summary, the present invention has the following excellent effects. (1) Even with a very fine cable, the polarity of the core can be easily identified.

[Brief description of drawings]

FIG. 1 is a perspective view of a two-core parallel coaxial cable showing a preferred embodiment of the present invention.

FIG. 2 is a perspective view of a two-core parallel coaxial cable showing another embodiment.

FIG. 3 is a perspective view of a two-core parallel coaxial cable showing another embodiment.

FIG. 4 is a perspective view of a two-core parallel coaxial cable showing another embodiment.

FIG. 5 is a sectional view of a conventional two-core parallel coaxial cable.

[Explanation of symbols]

12-core parallel coaxial cable 2a core 2b core 3 outer conductor 4 jacket 5 Marking tape 7 Inner conductor 8 insulators 9 mark 30 dot mark (mark)

Continued front page    (72) Inventor Noriyuki Imai             Hitachi, 1-1 Hidaka-cho, Hitachi City, Ibaraki Prefecture             Electric Wire Co., Ltd. Hidaka Factory (72) Inventor Kazunori Sasaya             Hitachi, 1-1 Hidaka-cho, Hitachi City, Ibaraki Prefecture             Electric Wire Co., Ltd. Hidaka Factory F-term (reference) 5G315 JA02 JB01 JB02 JC01                 5G319 EA05 EB09 ED07

Claims (2)

[Claims] 1. A core having an outer circumference of an inner conductor covered with an insulator is arranged in parallel, and the outer circumferences of these two cores are covered with an outer conductor, and the outer circumference of the outer conductor is made of an insulator. In a two-core parallel coaxial cable covering a jacket, the jacket is transparently formed, and a marking tape for indicating the polarity of the core is provided along the core between the jacket and the outer conductor. Characteristic 2-core parallel coaxial cable. 2. The two-core parallel coaxial cable according to claim 1, wherein the marking tape has a mark for indicating the direction of connection.