JP2002189157A - Jumper wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a jumper wire which is not buckled during a jumpering work and composed of a single core optical fiber cord branched from an optical fiber tape cord which is coated and integrated with a taping layer by arranging a plurality of optical fiber cords, in which an optical fiber element wire is reinforced by one or more high tensile bodies, coated and integrated with an coating layer, formed into a shape of which cross section is rectangular, and the high tensile bodies partially exist in the coated layer, so that the parts in which the high tensile bodies in the coated layer do not exist are adjacently arranged in parallel with each other. SOLUTION: The single core optical fiber cord 5 branched from the optical fiber tape cord 7 is coated with a tube 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jumper wire branched from a multi-core optical fiber tape cord suitable for in-house wiring, and more particularly, to preventing buckling during jumper-jumping work. .

[0002]

2. Description of the Related Art The present applicant has previously proposed an optical fiber cord having a structure as shown in FIG. 2 having a very small diameter and a high strength, and FIG.
An optical fiber tape cord having the structure shown in FIG. In FIG. 2, reference numeral 1 denotes an optical fiber. This optical fiber 1 is a normal one having an outer diameter of 250 μm by providing a primary coating and a secondary coating on a bare optical fiber having an outer diameter of 125 μm. This optical fiber 1 has 2
A tensile strength member 3 having a set of the tensile strength wires 2 and 2 is longitudinally attached, and the tensile strength body 3 and the optical fiber 1 are covered with a coating layer 4.
To form an optical fiber cord 5.

[0003] The optical fiber cord 5 has a coating layer 4 having a rectangular cross-sectional shape.
It is arranged on one of the short sides of the coating layer 4, and the strength member 3 does not exist on the other short side and long side of the coating layer 4. As the tensile strength wire 2, a thin wire having a diameter of 20 to 50 μm made of aramid fiber, PBO fiber, glass fiber, steel wire, or the like is used. Further, for the coating layer 4, a thermoplastic resin, a thermosetting resin, an ultraviolet curable resin, or the like is used. Further, the optical fiber cord 5 has a cross-sectional dimension of usually 0.35 to 0.4 mm in the long side direction and 0.28 to 0.26 mm in the short side direction, but is not limited to this range. Absent.

FIG. 3 shows an example of the optical fiber tape cord. The optical fiber tape cord 7 of this example is a tape-shaped one in which eight single-core optical fiber cords 5 shown in FIG. And each optical fiber cord 5
Are arranged so that portions of the coating layer 4 where the tensile strength members 3 do not exist are adjacent to each other, that is, long sides of the coating layer 4 are adjacent to each other.

With such an arrangement, the tensile members 3 of the optical fiber cords 5, 5,... Are located only on one side of the optical fiber tape cord 7. The same material as the resin forming the coating layer 4 is used for the tape forming layer 6, but the Young's modulus of the resin forming the tape forming layer 6 is lower than the Young's modulus of the resin forming the coating layer 4. It is preferable to perform the branching operation when branching to each of the optical fiber cords 5, 5,.

In the optical fiber tape cord 7 having such a structure, the tensile strength member 3 does not exist between the optical fiber wires 1 of the adjacent optical fiber cords 5 and only the coating layer 4 exists. By adjusting the thickness of the coating layer 4, the width of the optical fiber tape cord 7 can be made to match the width of the normal optical fiber, and the distance between the bare optical fibers can be adjusted by the optical fiber in the ordinary optical fiber. The spacing between the bare wires can be matched. For this reason, the optical fiber tape cord 7 and the ordinary tape core wire can be fused and connected together.

Further, as described above, since there is no tensile member in the width direction of the optical fiber tape cord 7, the dimension of the width itself can be reduced, and the density can be increased. Further, in this structure, the optical fiber tape cord 7
The strength member 3 exists only on one surface of
Can be easily cut and removed in a lump, and the taped layer 6 and the coating layer 4 can also be easily removed in a lump, so that there is an advantage that the optical fiber cord 5 can be easily branched at the time of connection.

FIG. 4 shows an example of use of the optical fiber tape cord 7. In this example, the optical fiber tape cord 7 has one end connected to a normal tape core 10.
The other end is branched into optical fiber cords 5, 5,... For connection with respective wirings, and is connected to connectors 11, 11,. As described above, the optical fiber tape cord 7 can be fused and connected to the ordinary optical fiber tape cord 10 at a time, and can be easily branched into single-core optical fiber cords 5, 5,. .. Can be jumper lines 8, 8,.

[0009]

However, there is a problem to be solved in such an optical fiber tape cord 7 as well. That is, the optical fiber tape cord 7
, The optical fiber tape 5 is separated into single fibers and the jumper wire 8
When this is used for in-house wiring, it is premised that work is performed on a wiring rack where a large number of connection cords are intricate. At the time of such jumping work, distortion occurs in the optical fiber cord 5 due to bending, and this When such distortion occurs, the optical fiber cord 5 may be buckled.

The present invention has been made in view of the above circumstances, and in a jumper wire composed of an optical fiber cord separated from the above-described small-diameter optical fiber tape cord by a single fiber, an optical fiber is crushed during a jumping operation. An object of the present invention is to obtain a jumper wire having high rigidity without bending.

[0011]

This problem is solved by covering the optical fiber cord separated from the optical fiber tape cord by a single core with a tube to form a jumper wire. At this time, the cord diameter of the jumper wire is 0.5 to
Desirably, it is 1.2 mm. It is desirable that the rigidity of the tube be 1 to 10 kg · mm ² .

[0012]

DETAILED DESCRIPTION OF THE INVENTION Hereinafter, the present invention will be described in detail with reference to FIG. FIG. 1 is a schematic view showing an example of a jumper wire according to the present invention, in which one of jumper wires 18, 18,. It is. The optical fiber tape cord 7 has the same structure as that shown in FIG. 3. The optical fiber cord 5 is formed by vertically attaching the tensile strength member 3 to the optical fiber 1 and coating and integrating it with the coating layer 4. ,
A plurality of tapes are arranged in parallel, and are integrally covered with a tape layer.

The jumper wires 18, 18,... Are formed by covering the optical fiber cords 5, 5,... (8, 8,. .

The tube 9 is cylindrical and has an outer diameter (equivalent to the outer diameter of the jumper wire 18) of 0.5 to 1.2 m.
It is preferably in the range of m. Its outer diameter is 0.
If it is less than 5 mm, the workability at the time of mounting the jumper wire 18 is deteriorated, which is inconvenient. If it is more than 1.2 mm, the jumper wire 18 becomes thick, and it becomes difficult to integrate a large number of cords on a wiring rack. This is inconvenient.

The rigidity of the tube 9 is 1 to 10 kg.
mm ² is desirable. The rigidity is 1 kg · mm ²
If it is less than 10 mm, the tube 9 will buckle, which is inconvenient. If it is 10 kg · mm ² or more, the handling property of the jumper wire 18 will be inferior, and it will be inconvenient.

The length of the tube 9 is determined by the length of the jumper wire 18 required for wiring, and needs to be long enough to cover the entire area of the optical fiber cord 5 branched from the optical fiber tape cord 7. Further, as a material of the tube 9, for example, polyvinyl chloride or the like is used, but the material is not limited to this.

The jumper wire 18 covered with the tube 9 does not buckle even if it is distorted by bending during the jumping operation on the wiring frame, and has excellent rigidity.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to embodiments. (Embodiment) On the circumference of an optical fiber 1 having an outer diameter of 250 μm, two steel wires having a diameter of 100 μm are disposed on opposite sides of the short side of the coating layer 4 as strength members 2, respectively.
Was produced. At this time, the length was 0.35 mm in the long side direction and 0.27 mm in the short side direction. Eight obtained optical fiber cords 5 were arranged in parallel, and these were covered and integrated with a tape layer 6 to obtain an optical fiber tape cord 7 having the structure shown in FIG. At this time, the dimensions of the optical fiber tape cord 7 were 2.20 mm in width and 0.4 in thickness.
0 mm.

Then, one end of the obtained optical fiber tape cord 7 is separated into a single core, and a single-core separated optical fiber cord 5 is covered with a tube 9 having an outer diameter of 0.9 mm and a length of 300 cm to form a jumper wire 18. . At this time, the rigidity of the tube 9 was set to 1 kg · mm ² .

(Comparative Example) An optical fiber tape cord 7 was produced in the same manner as in the embodiment, and an optical fiber cord 5 obtained by separating a single fiber from one end of the obtained cord was used as a jumper wire 8.

(Bulking Resistance Test) The following buckling resistance test was performed on the jumper wire 8 of these examples and the jumper wire 18 of the comparative example. First, as shown in FIG. 5A, a weight 2 is attached to one end of a sample 20 which is a jumper wire.
The weight 21 of 0 g is fixed. Next, as shown in FIG. 5B, the other end of the sample 20 is fixed on the substrate 24, and the end with the weight 21 is passed through a ring 23 made of a piano wire. At this time, the wheel 23 is fixed at a predetermined height, and the weight 21 is supported by the tester. Next, as shown in FIG. 5C, the support of the weight 21 is removed. As a result, the weight of the weight 21 is applied to the bent portion of the sample 20, and the sample 20 having poor buckling resistance buckles in this state.

Such a buckling resistance test was carried out on ten jumper wires of Examples and Comparative Examples, and the number of buckled ones of the ten jumpers was counted to evaluate the buckling resistance. As a result, the jumper wire 8 of the embodiment is
There were 0 out of 10 jumpers and 10 out of 10 jumpers in the comparative example. The results clearly show that the jumper wire 8 of the example has better buckling resistance than the jumper wire 18 of the comparative example. It can be said that such a jumper wire having excellent buckling resistance also has excellent handling characteristics.

[0023]

As described above, since the jumper wire of the present invention is covered with a tube, it can be used in a wiring rack where a large number of connection cords are complicated, such as when jumping. The optical fiber cord has sufficient rigidity to prevent buckling and has excellent handling characteristics.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an example of a jumper wire according to the present invention.

FIG. 2 is a sectional view showing an example of an optical fiber cord.

FIG. 3 is a sectional view showing an example of an optical fiber tape cord.

FIG. 4 is a schematic view showing an example of use of an optical fiber tape cord.

FIGS. 5A to 5C are schematic diagrams for explaining a buckling resistance test.

[Explanation of symbols]

 5 Optical fiber cord 7 Optical fiber tape cord 9 Tube 18 Jumper wire

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Ryoji Suzuki 1440, Mukurosaki, Sakura City, Chiba Prefecture Inside Fujikura Sakura Office Co., Ltd. (72) Inventor Keiji Ohashi 1440 Mutsuzaki, Sakura-shi, Chiba F-term in Fujikura Sakura Works (reference) 2H001 BB15 BB27 DD06 DD11 DD21 PP01 4G060 AA13 AA20

Claims (3)

[Claims] At least one tensile strength wire is longitudinally attached to an optical fiber and is integrally coated with a coating layer. The cross-sectional shape is rectangular, and the coating layer does not include a portion where a tensile strength member exists. A single-core optical fiber cord that is branched from an optical fiber tape cord in which a plurality of optical fiber cords with a portion and a covering layer where no tensile strength member is present are arranged in parallel so that they are adjacent to each other and covered and integrated with a tape layer. , Wherein the single-core optical fiber cord is covered with a tube. 2. The jumper wire according to claim 1, wherein the cord diameter is 0.5 to 1.2 mm. 3. The tube has a rigidity of 1 to 10 kg · m.
^3. The jumper wire according to claim 1, wherein the jumper wire is m ^{2. 4} .