KR100222790B1 - Single tube type optical fiber cable - Google Patents

Abstract

end. The technical field to which the claimed invention relates.

The present invention relates to a single-tube optical fiber cable capable of reducing the outside diameter and improving the temperature characteristics by distributing tensile wires of the optical cable.

I. Technical Problems to be Solved by the Invention.

The present invention provides a single-tube optical fiber cable capable of minimizing the outer diameter of an optical cable by dispersing a tensile wire in an optical cable.

All. A gist of a solution of the invention.

The object of the present invention is to provide a jelly-containing tube that includes an optical fiber of one or more cores and prevents moisture from penetrating into the optical axis of the optical cable, a waterproofing material for securing the characteristics of the optical fiber from outside, Wherein at least two stranded wires and at least two stranded auxiliary wires are provided on the outside of the metal tape for suppressing tension and contraction of the optical cable.

la. An important use of the invention.

Fiber optic cable.

Description

Single tube optical fiber cable {{SINGLE TUBE TYPE OPTICAL FIBER CABLE}

The present invention relates to an optical fiber cable, and more particularly, to a single-tube optical fiber cable capable of reducing the outside diameter and improving the temperature characteristics by dispersing tensile wires of the optical cable.

Typically, a loose tube type is most commonly used in the structure of an optical fiber cable, which is a twisted structure around a joist centered around a loose tube including a jelly and an optical fiber for waterproof purposes. In addition, a single tubular loose tube structure in which a single type of loose tube is arranged at the center of the optical fiber cable and the tensile wires are arranged side by side on both sides of the above-mentioned loop tube is often used. It has a small outer diameter, light weight and economical structure.

Accordingly, the single tubular routed tube optical fiber cable is disclosed in detail in Korean Patent Laid-Open No. 92-10324 (optical fiber cable) as already known, and the configuration is as shown in FIG. The structure of the optical fiber cable according to the prior art will be schematically described with reference to FIG.

A plastic tube 54 filled with jelly 52 is installed in the empty space in order to mount the optical fiber 50 of one or more optical fibers and prevent moisture from penetrating the surface of the optical fiber 50. A waterproof tape 56 is wound around the outer peripheral surface of the tube 54 to prevent moisture from penetrating the longitudinal direction of the optical cable. The outer circumferential surface of the waterproof tape 56 is surrounded by a coil 58 coated with a cosolma coating to protect the optical fiber 50 from the external environment.

A rib cord 62 is provided on the outer side of the coil 58 to facilitate removal of the optical cable when the optical cable is removed and a tensile cord 64 of two strands of steel is provided on the outer side of the coil 58 180 degrees apart. At this time, the tension line (64) is installed in contact with the outer surface of the steel strip (58). The tensile wire 64 and the steel strip 58 are coated with a covering material 60 made of polyethylene.

However, in the conventional optical fiber cable constructed as described above, since the two strands of the tensile wire are made of steel and have a large outer diameter, the optical cable is considerably stiff so that it does not bend well during installation, and when the optical cable is bent, (Water) penetrates between the tensile wire, the steel strip and the covering material, thereby damaging the inherent characteristics of the optical fiber. Further, since the outer diameter of the tensile wire is large, the outer diameter of the optical cable as a whole is large and the material consumption is accordingly large. A problem that can not be solved occurred.

In order to solve the above problems, it is an object of the present invention to provide a single-tube optical fiber cable capable of preventing a piston phenomenon between a tension line and a covering material by dispersing a required tensile force of an optical cable by providing two or more kinds of tension lines.

Another object of the present invention is to provide a single-tube optical fiber cable capable of minimizing the outer diameter of an optical cable by distributing a tensile wire to an optical cable.

It is another object of the present invention to provide a single-tube optical fiber cable capable of improving the tensile force required of an optical cable by providing respective main lines and auxiliary lines inside the optical cable.

It is another object of the present invention to provide a single-tube optical fiber cable which can reliably prevent moisture from penetrating into an optical cable.

In order to accomplish the above object, the present invention provides a single-tube optical fiber cable, comprising: a tube of plastic material filled with jelly, which is mounted on one optical fiber and prevents moisture from penetrating into the optical fiber; A waterproof material for preventing moisture from penetrating in the longitudinal direction of the optical fiber cable; a metal tape wound around the waterproof material for protecting the optical fiber from external environment; At least two stranded subsidiary liners installed on both sides while maintaining an interval of 90 degrees from the main land line, and at least two stranded subsidiary liners installed at both sides of the main land line and the auxiliary lintel to protect the optical cable, And a covering material covering the entire outer surface The.

1 is a cross-sectional view showing a configuration of a single-tube optical fiber cable according to an embodiment of the related art.

FIG. 2 is a cross-sectional view illustrating the configuration of a single-tube optical fiber cable provided with two strands of auxiliary strand and two strands of stranded fiber according to a preferred embodiment of the present invention. FIG.

3 is a cross-sectional view showing a configuration of a single-tube optical fiber cable used for a duct according to a second preferred embodiment of the present invention.

DESCRIPTION OF THE REFERENCE NUMERALS

10: Optical fiber 12: Jelly

14: Tube 16: Waterproofing material

18: metal tape 20,32:

22,34: Auxiliary seam 24: Cover material

30: Aluminum-tape

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, in adding reference numerals to the constituent elements of the drawings, it should be noted that the same constituent elements are denoted by the same reference numerals even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

FIG. 2 is a cross-sectional view illustrating the structure of a single-tube optical fiber cable having two auxiliary strands and two stranded fiber optic cables according to a preferred embodiment of the present invention.

As shown in FIG. 2, the acrylic-coated optical fiber 10 of at least one mark marked for identification between the optical fibers is mounted with a suitable elongation rate to protect the optical fiber 10 from an external impact A tube 14 is provided. At this time, in order to prevent water from penetrating into the surface of the optical fiber 10 in the empty space of the remaining tube 14 in which the optical fiber 10 is mounted and to perform a smooth function during operation, And the jelly 12 is filled with the optical fiber 10 to reduce the contact friction between the optical fibers 10 and to buffer the compression of the optical fiber 10.

The outer circumferential surface of the tube 14 is provided with a waterproof material 16 for preventing moisture from penetrating in the longitudinal direction of the optical cable. For example, since the waterproof tape 16 is made of a powder that expands in volume when absorbing moisture, it absorbs moisture when it penetrates and expands its volume to block the passage of water to protect the optical fiber 10. In addition, a corrugated metal tape 18 is wound around the outer circumferential surface of the waterproofing material 16 to protect the optical fiber 10 inside the tube 14 from the external environment. In this case, the metal tape 18 may be a steel tape coated on both sides with a copolymer to protect the inside from external infiltration elements such as side pressure acting on the optical cable or rodents, Aluminum tapes coated with this copolymer may also be used.

In order to protect the optical fiber 10 from tensile and contractile forces applied to the optical cable when the optical cable is installed or operated, the outer surface of the metal tape 18 is made of a steel material having a high tensile strength and a high elongation property or a fiber reinforced (2 strands) are provided at intervals of 180 degrees from each other while maintaining a predetermined distance from the metal tape (18). At this time, the outer diameter of the main lead wire 20 is designed to withstand 50% or more of the required tensile strength of the optical cable.

In order to apply a tensile force to the optical fiber so as to have tensile strength as much as that of the main tensile cord 20, an aramid fiber or a glass-based fiber material having high tensile strength and high Young's modulus Auxiliary auxiliary seals 22 are respectively installed (two strands) while maintaining an interval of 90 degrees between the two main seam leads 20. The two stranded wires (20) and the at least two stranded auxiliary wires (22) are coated with the entire outer circumferential surface by a covering material (24) of polyethylene which protects the optical cable. Further, since the auxiliary phosphorus wire 22 is used as a peeling wire for peeling off the optical fiber cable, it is not necessary to set a separate rip cord.

3 is a cross-sectional view illustrating the construction of a single-tube optical fiber cable used for a duct according to a second preferred embodiment of the present invention.

As shown in FIG. 3, the optical fiber is mounted such that one or more acrylic coated optical fibers 10 marked by marking for identification between the optical fibers have a proper elongation rate, and protect the optical fiber 10 from external shocks A tube 14 is provided. At this time, in order to prevent water from penetrating into the surface of the optical fiber 10 in the empty space of the tube 14 in which the optical fiber 10 is mounted and to perform a smooth function during operation, And the jelly 12 is filled with a buffer for reducing the contact friction between the optical fibers 10 and the compression of the optical fiber 10.

On the outer circumferential surface of the tube 14, an aluminum-tape 30 coated with a copolymer on both sides for moisture-proofing the optical cable is wound. In order to protect the internal optical fiber 10 from tensile and contractile forces applied to the optical cable when the optical cable is installed or operated, the outer surface of the aluminum-tape 30 is made of a steel material or a fiber reinforced material having properties of high tensile strength and high elongation The main hoop lines 32 made of plastic are installed at two spaced apart intervals of 180 degrees from each other while maintaining a constant spacing from the aluminum-tape 30. At this time, the outer diameter of the main conductor wire 32 is designed to withstand more than 50% of the required tensile strength of the optical cable.

In order to apply tensile force to the optical fiber so as to have a tensile force sufficient for insufficient tensile strength of the main tensile cord 32, an aramid fiber or a glass-based fiber material having high tensile strength and high Young's modulus (At least two strands as a whole) are provided at least one strand at a distance of 90 degrees from the main conductor wire 32. [ The two strands of the main strands 32 and the auxiliary strands 34 of at least two strands are coated with the entire outer circumferential surface by a covering material 24 made of polyethylene to protect the optical cable.

In addition, since the auxiliary attachment wire 34 is used as a release wire for stripping the optical fiber cable, it is not necessary to set a separate rip cord.

As described above, in the single-tube optical fiber cable according to the embodiment of the present invention, the main branch line and the auxiliary branch line are separately provided to maintain a constant tension required by the optical cable, so that the outer diameter of the main branch line is significantly reduced, It is possible to securely prevent the penetration of moisture into the tube by completely wrapping the main conductor wire with the metal tape or the aluminum tape at a predetermined interval so as to be completely wrapped by the covering material, Therefore, it is possible to prevent the piston phenomenon with the covering material. Also, since the auxiliary reinforcement is made of a high strength fiber material, it is possible to maintain the inherent characteristic of the optical fiber even in a low temperature and high temperature environment according to the temperature change of the optical cable, Peel off When you want it is not necessary to mount a separate rip cord, and there is an effect that can be the auxiliary factor coverings because the distributed buffering action standing protect the optical fiber inside the tube by the impact of the external lateral pressure exerted on the optical cable.

Claims (4)

In a single-tube optical fiber cable, A tube made of plastic filled with jelly to prevent the penetration of moisture into the optical fiber side, the optical fiber being mounted on one optical fiber; A waterproof material that is wound around an outer circumferential surface of the tube to prevent moisture from penetrating the longitudinal direction of the optical cable; A metal tape wound around the outer surface of the waterproofing material to protect the optical fiber from external environment; A pair of main strap lines spaced apart from each other by a predetermined distance so as not to be closely contacted with the metal tape and spaced apart from each other by 180 degrees; At least two auxiliary attachment lines provided on both sides while maintaining an interval of 90 degrees from the main attachment line; And a covering material covering the entire outer surface of the main and auxiliary linings for protecting the optical cable. The method according to claim 1, Wherein the main conductor is a steel material or a fiber reinforced plastic material having characteristics of high tensile strength and high Young's modulus and is manufactured to have an outer diameter capable of withstanding at least 50% of the required tensile strength of the optical cable. The method according to claim 1, Wherein the auxiliary jacket is an aramid fiber or glass fiber material having high strength and high Young's modulus. The method according to claim 1, Wherein the metal tape is an aluminum material or a steel material coated on both sides with a copolymer.