JPH0593830A - Optical fiber cable - Google Patents

Abstract

PURPOSE:To provide an optical fiber cable capable of suppressing the deformation of an optical fiber housing unit. CONSTITUTION:A fiber housing line body 6 having such structure that the outer surface of a side plate 6a and the base of a bottom plate 6b are orthogonally crossed with each other and a groove 6c is provided between the side plates 6a is used. A coated optical fiber tape 7 is housed in the groove 6c of the fiber housing line body 6, thereby constituting the optical fiber housing unit 2. The respective units 2 are aggregated so that the planes of the adjacent fiber housing line bodies 6 are mutually abut on each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber cable in which a plurality of optical fiber storage units are assembled to form an optical fiber assembly.

[0002]

2. Description of the Related Art A conventional optical fiber cable of this type is
As shown in FIG. 6, a tension member main body 1a is provided with a tension member 1 having a round cross section with a plastic coating layer 1b provided on the outer periphery thereof, and a plurality of optical fiber storage units 2 are provided on the outer periphery of the tension member 1. The bottom surface is brought into contact with the outer circumference of the tension member 1, and a holding winding 3 is provided on the outer circumference of the assembly of the optical fiber housing units 2, and a plurality of optical fiber housing units 2 are provided on the outer circumference of the holding winding 3. Has a bottom surface abutting the outer circumference of the press winding 3, and a press winding 4 is provided on the outer circumference of the assembly of the optical fiber housing units 2, and a cable sheath 5 is provided on the outer circumference. Was becoming.

As shown in FIG. 7, the optical fiber accommodating unit 2 has a fiber accommodating strip 6 having a structure in which an outer surface of a side plate 6a and a bottom surface of a bottom plate 6b are orthogonal to each other and a groove 6c is provided between the side plates 6a. , The optical fiber ribbon 7 in the groove 6c
Has a structure in which multiple stages are stored

[0004]

In the optical fiber cable having such a structure, the optical fiber housing unit 2 is deformed when subjected to bending or lateral pressure, and the optical fiber tape housed in the unit 2 is deformed. There is a problem that the transmission characteristics of the core wire 7 are adversely affected.

Further, the wall thickness of the side plate of the fiber accommodating strip 6 has to be made thinner as the density becomes higher in a subscriber optical fiber cable, so that the mechanical strength becomes weaker, and the above-mentioned is further reduced. There was an inconvenience that the influence of the problem was increased.

An object of the present invention is to provide an optical fiber cable capable of suppressing the deformation of the optical fiber housing unit.

[0007]

To explain the structure of the present invention for achieving the above object, the present invention is directed to a fiber storage strip having a structure in which an outer surface of a side plate and a bottom surface of a bottom plate are orthogonal to each other and a groove is provided between the side plates. An optical fiber cable comprising an optical fiber storage unit in which an optical fiber tape core wire is stored in the groove of the body, and a plurality of the optical fiber storage units are assembled to form an optical fiber assembly. The optical fiber accommodating unit is characterized in that the adjacent fiber accommodating strips are assembled by abutting their respective planes.

[0008]

In this way, since the fiber storage strips are assembled with their flat surfaces in contact with each other, they reinforce each other and are unlikely to be deformed even when subjected to pressure. Therefore, it is possible to prevent the transmission characteristics of the optical fiber ribbon from being deteriorated due to lateral pressure or the like.

[0009]

Embodiments of the present invention will now be described in detail with reference to the drawings. The parts corresponding to those in FIGS. 6 and 7 described above are designated by the same reference numerals.

1A and 1B show two examples of the optical fiber storage unit 2 used in the present invention.
The optical fiber storage unit 2 shown in FIG. 1A has a groove 6c.
Shows an example of one type. The optical fiber storage unit 2 shown in FIG. 1B shows an example of a type having two grooves 6c.

FIG. 2 shows a first embodiment of the optical fiber cable according to the present invention. In this embodiment, the tension member 8 has a quadrangular structure in which the plastic coating layer 8b on the outer periphery of the tension member main body 8a has a quadrangular shape in which adjacent planes are orthogonal to each other. In addition, in this embodiment, as the optical fiber storage unit 2,
The groove 6c shown in FIG. 1B is of two types.

With respect to the tension member 8, the optical fiber accommodating unit 2 has a side plate 6a of the fiber accommodating strip 6.
Alternatively, the flat surfaces of the bottom plate 6b are brought into contact with each other, and the adjacent fiber storage strips 6 are brought into contact with each other by bringing the flat surfaces of the side plates 6a or the bottom plate 6b into contact with each other.

An optical fiber assembly 9 is formed by providing a presser winding 3 on the outer circumference of the assembly of the tension member 8 and the optical fiber housing unit 2. A sheath 5 is provided on the outer circumference of the optical fiber assembly 9.

In such an optical fiber cable, since the tension member 8 and the fiber accommodating strip 6 are gathered with their flat surfaces in contact with each other, they reinforce each other and are unlikely to be deformed even when subjected to pressure. Therefore, it is possible to prevent the transmission characteristics of the optical fiber ribbon 7 from being deteriorated by lateral pressure or the like.

FIG. 3 shows a second embodiment of the optical fiber cable according to the present invention. In this embodiment, a plurality of optical fiber assemblies 9 are twisted around the outer circumference of the tension member 1 having a round cross section, a presser winding 10 is provided on the outer circumference thereof, and a sheath 5 is provided on the outer circumference thereof. It has a special structure.

FIG. 4 shows a third embodiment of the optical fiber cable according to the present invention. In this embodiment, one type of groove 6c shown in FIG. 1A is provided on each plane around the tension member 1 having a quadrangular cross-sectional shape.
The groove 6c shown in (B) collects the two types of optical fiber housing units 2 with their flat surfaces in contact with each other, and the optical fiber housing unit 2 has a two-layer structure.
This is an example using.

FIG. 5 shows a fourth embodiment of the optical fiber cable according to the present invention. In this embodiment, FIG.
The groove 6c shown in (A) is one type and the groove 6c shown in FIG. 1 (B) is an optical fiber housing unit 2 of two types. A flat optical fiber assembly 9 is formed by arranging two of them side by side and providing a presser winding 3 on the outer circumference of the flat optical fiber assembly 9. The flat optical fiber has a quadrangular sheath 5 on the outer circumference of the optical fiber assembly 9. It is an example of a cable. Sheath 5
Tension members 11 are built in the inner surfaces on both sides in the width direction along the longitudinal direction.

With such a flat structure, the mounting density of the optical fibers (the number of optical fiber cores with respect to the cable cross-sectional area) can be increased as compared with the round structure.

[0019]

As described above, each optical fiber storage unit in the optical fiber cable according to the present invention is
Since the flat surfaces of the fiber accommodating strips adjacent to each other are brought into contact with each other and assembled together, they reinforce each other and are less likely to be deformed even when subjected to pressure. Therefore, it is possible to prevent the transmission characteristics of the optical fiber ribbon from being deteriorated due to lateral pressure or the like.

[Brief description of drawings]

1A and 1B are cross-sectional views showing two examples of an optical fiber storage unit used in this embodiment.

FIG. 2 is a cross-sectional view of the first embodiment of the optical fiber cable according to the present invention.

FIG. 3 is a cross-sectional view of a second embodiment of the optical fiber cable according to the present invention.

FIG. 4 is a transverse sectional view of a third embodiment of the optical fiber cable according to the present invention.

FIG. 5 is a transverse sectional view of a third embodiment of the optical fiber cable according to the present invention.

FIG. 6 is a cross-sectional view of a conventional optical fiber cable.

FIG. 7 is a cross-sectional view of an optical fiber storage unit used in a conventional optical fiber cable.

[Explanation of symbols]

1 ... tension member, 1a ... tension member main body,
1b ... Plastic coating layer, 2 ... Optical fiber storage unit, 3, 4 ... Presser winding, 5 ... Cable sheath, 6 ... Fiber storage strip, 6a ... Side plate, 6b ... Bottom plate, 6c ... Groove, 7 ...
Optical fiber tape core wire, 8 ... Tension member, 9 ... Optical fiber assembly, 10 ... Presser winding, 11 ... Tension member.

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Akihiro Otake 2-6-1, Marunouchi, Chiyoda-ku, Tokyo Furukawa Electric Co., Ltd.

Claims (1)

[Claims] 1. An optical fiber storage unit in which an optical fiber ribbon is stored in the groove of a fiber storage member having a structure in which an outer surface of a side plate and a bottom surface of a bottom plate are orthogonal to each other and a groove is provided between the side plates. An optical fiber cable comprising a plurality of the optical fiber housing units assembled to form an optical fiber assembly, wherein each of the optical fiber housing units has a flat surface between adjacent fiber housing strips. An optical fiber cable, which is assembled by abutting against each other.