JPS597907A - Optical cable unit - Google Patents

Abstract

PURPOSE:To facilitate inward depression when tensile force operates and to secure tension release by twisting element wires which each have a gel material around an optical fiber and also have a coating around a center wire. CONSTITUTION:An optical cable unit uses unit element wires 10 which each have the gel material layer 8 around the optical fiber core 1 and also have the coating 9 around it, and the center wire 6 formed by providing a soft high-polymer material layer 5 of soft silicone rubber, etc., around a tension member 4 such as a stainless steel wire. Plural element wires 10 are twisted around this center wire 6 and twisted grooves at the circumference are packed with a soft high- polymer material 7 such as soft silicone rubber. This soft high-polymer material 7 have about 0.01kg/mm.<2> Young's modulus. The core wire 1 is formed by providing a primary coating, a buffer, and a secondary coating layer around the optical fiber. As the gel material, a silicone gel is used suitably.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to an optical cable unit in which a plurality of unit wires are twisted around a center line.

The original fiber core wire has a much smaller allowable elongation than other cable constituent materials, and is weak against elongation.

For this reason, an optical cable unit as shown in FIG. 1 has been proposed in order to protect the original fiber centerline from tension when tension is applied to the optical cable unit. This optical cable unit includes a unit wire 3 made of a soft polymer material 1-2 such as soft silicone rubber on the outer periphery of an optical fiber core 1, and a unit wire 3 made of a soft polymer material 1-2 such as soft silicone rubber on the outer periphery of a tension member 4 such as stainless steel wire. It has a structure in which a plurality of soft polymer material layers 5 are twisted around the outer periphery of a center line 6, and the twist grooves on the outer periphery are filled with a soft polymer material 7 such as soft silicone rubber.

In such an optical cable unit, as the tension increases, the fiber cores 1 of each party compress the soft polymer materials jm2, 5 and gradually sink toward the center of the cable, resulting in a smaller twisting radius, and the optical fibers shrink accordingly. The tension applied to the core wire 1 can be alleviated.

In this case, the soft polymer material layers 2 and 5 must have sufficient hardness to prevent them from being rubbed off by a supply reel or the like during manufacturing, so that the optical fiber core 1 will sink sufficiently when subjected to tension. There was a drawback that it could not be compressed and could not exert a sufficient tension relieving effect.

An optical cable unit using a unit wire in which the optical fiber core wire is housed with extra length in a hollow pipe has been proposed as a device that allows the optical fiber core wire to move freely within the unit cable. There is. However, in the original Google unit using such a pipe-type unit, it is difficult to keep the optical fiber 6 fat floating in the center of the pipe. The wire is housed in a meandering manner, and therefore, during one cycle of use, the optical fiber core hJIr' is likely to undergo a phase shift in the direction of the force. As a result, the original fiber core tends to have local slack and tension along the longitudinal axis, and when the tension is applied to the stiff fiber C, the fibers tend to loosen and loosen. There was a risk that the flood and condensation could be reduced by one shade per year, and there was a drawback that the applied force relaxation effect could not be met reliably.

The object of the present invention is to provide an original cable unit that can be used with 11 effects and that can be easily used.

In the optical cable unit according to the present invention, a plurality of unit wires each having a gel-like material MI* provided instead of one optical fiber core wire and an external wave provided on the outer periphery are twisted around the outer periphery of a center line. It is characterized by this.

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

FIG. 2 shows a first embodiment of the present invention. The optical cable unit of this embodiment includes a unit wire 10 in which a gel-like Jf/J wire 8 is provided around an optical fiber core 1, and a side conductor 9 is provided on the outer periphery, and a tensile wire 10 such as a stainless steel wire. A center leg 6 is provided with a soft island molecular layer 5 such as soft silicone comb on the outer periphery of the Yong member 4, and a plurality of unit wires 1 are attached to the outer periphery of the center leg 6.
0 is twisted together, and its outer circumference is suppressed i! It has a structure in which the It groove is filled with a soft material 7 such as a soft silicone comb. As a soft barrier material, 01 has a kink rate of o, o.
1kg/yrn! 'Use one with N degrees. As the optical fiber core 1, for example, an optical fiber in which a primary handling sheath, a low-strength layer, and a secondary handling cross-layer are provided in a row on the outer periphery of the optical fiber is used. The second coat @rm is made of, for example, fiber-reinforced glass, nylon, Teflon, or the like. The gel material layer 8 is formed using, for example, Noricone gel.

Such a gel-like substance has no fluidity, does not hinder the movement of the optical fiber core 1, and has a self-healing TM function (the cut portion is self-fused) when cut by the movement of the optical fiber core 1. ) or JIS? l! l! The degree has the property of being zero. The external wave 9 is made of, for example, silicone rubber.

In such an optical cable unit, when tension is applied, the core wires 1 of each party sink toward the center of the unit within the gel fall material layer 8, so they are not subjected to resistance and Q (easily), and the tension relaxation 1) effect can be reliably obtained.-Also, even in the 1st case where the applied force is removed, each party fiber +L-i1 can easily return to the child's position side due to its own Mll property. -C is completed.

The fifth example shows the second embodiment of the present invention. In the original cable unit of this embodiment, the center leg 6 is a gel-like material made of noricorn gel or the like on the outer periphery of the central leg 6; 12 is used. In other respects, the structure is similar to that of the first embodiment.

According to such an optical cable unit, the fiber core wire 1 of each party sinks toward the center of the cable within the unit wire 10 due to tension, and the tension relieving effect is insufficient only when the fiber core wire 1 is in contact with the outer sheath 9. Furthermore, when tension is applied to the optical fiber core 1, the optical fiber core 1 sinks further into the cable middle upper part 11 by indenting the outer sheath 12 of the center line 6 via the outer sheath 9. , the tension relaxation effect can be further improved.

The unit wire 10 used in the present invention is manufactured, for example, as follows. That is, a gel-like material layer 8 made of silicone gel is coated on the surface of the optical fiber/core wire l, and after drying the surface, a surface hardening agent is attached to the surface to harden the surface of the gel-like material layer 8. This is done by curing only the silicone rubber to form a silicone rubber, and using this silicone rubber layer as the outer cover 9. Or use a high-quality polymer material around the outer circumference of the optical fiber core 1!
The outer sheath 9 is extruded and coated in the shape of a vibrator.
It can also be manufactured by filling the inside with a gel-like substance.

The optical cable unit according to the present invention can be used as a base cable for one unit by covering its outer periphery with a cable sheath, or can be used as an optical cable for multiple units by twisting a plurality of units together and covering the outer periphery with a cable sheath. be able to.

As explained above, in the optical cable unit according to the present invention, a plurality of unit wires each having a gel-like material I- provided instead of one optical fiber core wire and a jacket provided on the outer periphery are arranged around the center line. Because of the twisted structure, when tension is applied, each optical fiber core sinks into the center of the cable more easily with less resistance than with conventional silicone rubber solid coated cables. It is possible to reliably obtain a relaxing effect. In addition, since a gel-like substance is used, it is easy to float the optical fiber at the center of the outer sheath, which is suitable for the tension M9, and the winding radius of the outer sheath during winding. Since the winding radius of the optical fiber core is smaller than 8<a, the winding length of the optical fiber can be prevented from becoming shorter than the winding length of the jacket.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a conventional optical cable unit, and FIGS. 2 and 5 are cross-sectional views of first and second embodiments of the optical cable unit according to the present invention. 1...Optical fiber core wire, 3...Unit wire, 4...
・Tension member, 5... Soft polymer material layer, 6.
... Center line, 8 ... Gel-like material layer, 9 ... Outer covering, 1
0... Unit wire, 11... Gel-like substance layer, 12
... Outer covering. Procedural amendment (spontaneous) Kazuo Wakasugi, Commissioner of the Japan Patent Office1, Indication of the case, Patent Application No. 116206/19822, Name of the invention: Optical cable unit (529) Furukawa Electric Co., Ltd.4, Agent: 105 East jil 6th floor, Bunzan Building, 4-31-6 Shinbashi, Minato-ku, Minato-ku Column 6 of the detailed description of the invention in the detailed description of the invention, the description of the amendments will be corrected as follows. (1) "Inside the 1st twist groove on page 4, line 13" is changed to "inside the twist groove and the gap around its inner circumference" llbema+21 Page 5, 4th
In lines ~5, ``Tokorono...garari,'' is corrected to ``One place has the property of being fixed and repaired.''that's all

Claims (1)

[Claims] tl) Is there a gel around the optical fiber? ! I layer. An optical cable unit characterized in that a plurality of unit wires each having a nail cutter provided on the outer periphery are twisted together around the outer periphery of a center line. (2) The optical cable unit according to claim 1, wherein the center line has a structure in which a gel-like material layer is provided on the tension member t, and an outer sheath is provided on the outer periphery of the gel-like material layer.