JP2001249259A - Optical cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an optical cable which is easy to lead out an optical cord, which is easy to manufacture and which is suitable for floor wiring or the like available at low cost. SOLUTION: Optical fibers 14, 14 are enclosed with a tension fiber 15; on both sides of a cord 11 covered with a sheath 16, tension members 12, 12 are provided which are tension wires 17 coated with a resin jacket 18; and the tension members are connected to the cord with connecting parts 13, 13 made of a thin resin. The sheath 16, the resin jacket 18 and connecting parts 13, 13 are composed of the same resin material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical cable, and more particularly to an optical fiber cable suitable for wiring a floor in a building.

[0002]

2. Description of the Related Art FIG. 5 shows an example of a conventional optical cable for floor wiring. In FIG. 5, reference numeral 1 denotes an optical code. This optical cord 1 surrounds an optical fiber core 2 with a tensile strength fiber 3 such as aramid fiber, carbon fiber, glass fiber, and a sheath made of a thermoplastic resin such as nylon 12, plasticized polyvinyl chloride, or polyethylene. 4
With an outer diameter of about 2.1 to 2.8 mm.

[0003] The optical cord 1 is accommodated in a batch covering material 5 made of polyethylene, plasticized polyvinyl chloride or the like and having a rectangular cross section in a state where the two are parallel.
In this collective covering material 5, two tensile wires 6, such as steel wires, are provided.
6 are accommodated on both sides of the optical cords 1 and 1 at a distance from them. In the center of both long sides of the batch covering material 5, cut grooves 7, 7 each having a V-shaped cross section are formed.

[0004] However, the optical cable having such a structure has a drawback that it is troublesome to work out at the terminal. That is, in the opening, first, the collective covering material 5 is torn from the center into two using the cut grooves 7,7. However, as shown in FIG. 6, the optical cord 1 is still buried in the collective covering material 5, and thus the collective covering material 5 is further torn in order to take out the optical cord 1. It is necessary to push out the surface and pull out the optical code 1 inside. Next, the collective covering material 5 from which the optical cord 1 has been drawn is cut in the lateral direction, and the tensile strength wire 6 is exposed.

[0005] In addition, there have been the following inconveniences in the manufacture thereof. First, after the optical cord 1 is manufactured in advance in the optical cord manufacturing process, the optical cord 1 and the tensile strength wire 6 are sent to an extrusion head, and the blanket coating material 5 is extrusion-coated. There is also a disadvantage that the number of steps is two and the production cost is high.

[0006]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an optical fiber cable which can easily perform an operation of tapping an optical cord, can be easily manufactured, and can be provided at low cost.

[0007]

The object of the present invention is to provide a cord member in which one or more optical fibers are surrounded by a tensile strength fiber and a sheath is covered therewith, and a tension member portion in which a tensile strength wire is covered with a resin sheath. An optical cable having a structure in which the tension members are arranged in parallel on the sides of the cords and connected by a connecting portion made of a thin resin. Further, if the sheath of the cord portion, the resin sheath of the tension member portion, and the connecting portion are made of the same material and are simultaneously covered and formed, the number of manufacturing steps can be reduced. Further, if the outer diameter of the cord portion and the tension member portion is substantially the same or the outer diameter of the cord portion is smaller than the outer diameter of the tension member portion, when the optical cable is fastened with a staple, the cord portion cannot be pressed with excessive force. Pressure does not work. Further, there may be two or more cord portions.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.
FIG. 1 shows a first example of an optical cable according to the present invention.
In the figure, reference numeral 11 is a code portion, 12 is a tension member portion,
Reference numeral 13 denotes a connecting portion. The cord section 11 arranges two optical fiber wires 14, 14 in parallel with a slight gap therebetween,
This is wrapped with a yarn-shaped tensile fiber 15 such as aramid fiber, carbon fiber, glass fiber, etc., and covered with a sheath 16 made of a resin such as polyethylene or plasticized polyvinyl chloride. It is about 4 mm.

The tension member 12 has a diameter of 0.4 to 1
A steel wire having a diameter of 1 to 1.7 mm and a tensile strength wire 17 composed of a FRP (fiber reinforced resin) string having a diameter of 1 to 1.7 mm are covered with a resin sheath 18 such as polyethylene or plasticized polyvinyl chloride. It is about 1.2 to 2.8 mm.

The connecting portion 13 has a thickness of 0.2 to 0.8 mm,
Preferably 0.4-0.5 mm, width 0.02-0.2 m
m, preferably a thin band of 0.04 to 0.09 mm, made of a resin such as polyethylene or plasticized polyvinyl chloride, and integrated with the sheath 16 of the cord portion 11 and the resin sheath 18 of the tension member portion 12. Have been. Tension member portions 12 and 12 are disposed at symmetrical positions on both sides of the cord portion 11, respectively.
These are integrally connected by 13.

The resin material forming the sheath 16 of the cord portion 11 and the resin sheaths 18 of the tension member portions 12, 12 may be different from each other, but it is preferable that the three members be the same material. The use of the same material simplifies the manufacture, and is usually made of the same material. The optical fiber accommodated in the cord portion 11 may be an optical fiber core wire or an optical fiber tape core wire in addition to the optical fiber strand 14, and if an optical fiber tape core wire is used, the core gap is, for example, 0 mm. .75m
If m is used, the terminal can be easily connected to the multi-core connector.

FIG. 2 shows a second example of the optical cable according to the present invention. In the optical cable of this example, the outer diameter of the tension member portion 12 is substantially the same as the outer diameter of the cord portion 11, and the same as the previous example except that the coating thickness of the resin sheath 18 is increased. Has become.

FIG. 3 shows a third example of the optical cable according to the present invention. In this example, the cord portion 11 is a single core having one optical fiber 14, and The tension members 12, 12 are integrally and in parallel provided on both sides of the cable 11 via the connecting portions 13, 13, and the outer diameter of the cord 11 is larger than the outer diameter of the tension members 12, 12. Is similar to the previous example, except that is also slightly smaller.

FIG. 4 shows a fourth embodiment of the optical cable according to the present invention.
2 are connected in parallel by a connecting portion 13, and tension member portions 12, 12 are integrally provided on both sides of the two cord portions 11, via the connecting portions 13, 13. 11 is the tension member part 1
It is slightly smaller than the outer diameter of 2,12.

FIG. 5 shows a fifth embodiment of the optical cable of the present invention. In the optical cable of this embodiment, the cross-sectional shape of the tension member portions 12 on both sides of the cord portion 11 is elliptical. The third example is different from the third example in that the major axes of the tension members 12, 12 are orthogonal to the line connecting the tensile strength lines 17, 17. In the optical cable of this example, since the width of the optical cable can be reduced, when the optical cable is accommodated in the conduit, the accommodation is easy and the number of accommodated cables is increased.

Next, a method of manufacturing an optical cable having such a structure will be described with reference to the first example of the optical cable. The two optical fiber wires 14, 14 are fed to the collecting head together with the yarn of the tensile strength fiber 15, and the tensile strength fiber 15 is assembled around the two optical fiber wires 14, 14 to form an aggregate. The assembly is subsequently sent to an extrusion head.

At the same time, two tensile strength lines 17, 17 are supplied to the extrusion head, and the molten resin such as polyethylene and plasticized polyvinyl chloride supplied from the extruder is aggregated and the tensile strength lines 17, 17 are supplied. At the same time as covering the upper portion, the continuous portion 13 is integrally formed to obtain an optical cable having a sectional shape shown in FIG. 1 or FIG.

In an optical cable having such a structure,
By simply tearing the thin connecting portions 13 and 13 by hand, the cord portion 11, that is, the optical cord can be separated and taken out, so that the cord portion 11 can be very easily taken out and can be directly connected to the optical connector. . Also, even if a tensile force is applied to the optical cable, for example, when the optical cable is laid, the tension members 12 on both sides bear this tensile force, and the cord 1
1 is hardly affected by a tensile force, and the optical fiber 14 is not broken or its transmission loss is not increased.

If the sheath 16 of the cord portion 11, the resin sheath 18 of the tension member portion 12, and the connecting portion 13 are made of the same material, they can be manufactured by the above-described manufacturing method. Can be reduced. Further, in the structure shown in FIG. 2, when this optical cable is fixed to a floor, a wall, or the like with a stapler, the pressing force by the stapler is applied not only to the cord portion 11, but also to the tension member portions 12, 12. Therefore, no harmful side pressure acts on the optical fiber 14.

Further, in FIGS. 3 and 4,
The pressing force at the time of the stop by the stapler is hardly applied to the cord portion 11, and no harmful lateral pressure acts on the optical fiber 14 at all. Also, the tension member unit 1
When the non-metallic material such as the FRP string or the aramid yarn is used as the tensile strength wire 17, the non-metallic type optical cable is used.

[0021]

As described above, according to the optical cable of the present invention, if the connecting portion is cut off by hand or the like, the cord portion becomes the optical cord as it is, so that the optical cord can be very easily taken out. Become. Further, the number of manufacturing processes for manufacturing this is small, and the manufacturing cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an example of an optical cable of the present invention.

FIG. 2 is a schematic sectional view showing another example of the optical cable of the present invention.

FIG. 3 is a schematic sectional view showing another example of the optical cable of the present invention.

FIG. 4 is a schematic sectional view showing another example of the optical cable of the present invention.

FIG. 5 is a schematic sectional view showing another example of the optical cable of the present invention.

FIG. 6 is a schematic sectional view showing an example of a conventional optical cable.

FIG. 7 is a schematic sectional view showing a state when a conventional optical cable is taken out.

[Explanation of symbols]

11: cord portion, 12: tension member portion, 13: connecting portion, 14: optical fiber, 15: tensile fiber, 16
... Sheath, 17 ... Tensile wire, 18 ... Resin sheath

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Kazunaga Kobayashi 1440, Mukurosaki, Sakura City, Chiba Prefecture Inside Fujikura Sakura Office (72) Inventor Suehiro Miyamoto 1440, Musaki, Sakura City, Chiba Prefecture Inside Fujikura Sakura Office (72) Inventor Kimio Ando 2-3-1 Otemachi, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Inventor Eiji Araki 2-3-1 Otemachi, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Stock In-house (72) Inventor Shinji Nagasawa 2-3-1 Otemachi, Chiyoda-ku, Tokyo F-term (reference) 2H001 DD06 DD11 DD15 DD21 KK22

Claims (5)

[Claims] 1. A cord portion comprising at least one optical fiber surrounded by a tensile strength fiber and covered with a sheath, and a tension member portion comprising a tensile strength wire covered with a resin sheath. An optical cable, wherein member portions are arranged in parallel, and these are connected by a connecting portion made of a thin resin. 2. The optical cable according to claim 1, wherein the sheath of the cord portion, the resin sheath of the tension member portion, and the connecting portion are made of the same material, and are simultaneously coated and formed. 3. The optical cable according to claim 1, wherein the outer diameter of the cord portion and the outer diameter of the tension member portion are substantially the same. 4. An outer diameter of a cord portion is smaller than an outer diameter of a tension member portion.
Optical cable as described. 5. The optical cable according to claim 1, comprising two or more cord portions.