JPH1152201A - Tape cord structure of optical fiber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tape cord structure which achieves the higher density and smaller diameter of optical fibers and improves connectability, i.e., allows multifiber simultaneous connection. SOLUTION: This tape cord structure is formed by forming single-core optical fibers 15, 15,... and tensile members 17, 17,... arranged in the specific positions on the circumferences thereof as single-core fibers of one unit. Plural units of these single-core fibers 21, 21,... of one unit are arranged in parallel on the same plane and are simultaneously coated with a coating material. At this time, notches 31 which is the base point dividing the respective single-core fibers 21 to each fiber are formed at either of at least the front surface or rear surface of the coating layers 23 coated by the coating material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape cord structure of an optical fiber for communication.

[0002]

2. Description of the Related Art Generally, a tape cord of an optical fiber used for a cable connecting between frames in a station has a structure as shown in FIG. That is, this tape code 1
Used a cable having a structure in which a plurality of single wires 3 having an outer diameter of about 2 mm were assembled. The single core wire 3 has a structure in which a tensile strength fiber 7 as a tensile strength member is vertically arranged on an optical fiber 5 having an outer diameter of about 0.9 mm, and a coating layer 9 is formed by coating vinyl or the like on the outermost layer. It has become.

[0003]

In recent years, there has been a demand for an optical fiber having a higher density, that is, a smaller diameter, and an improvement in connectivity, that is, a possibility of multi-core collective connection. However, as described above, in a cable in which a plurality of single-core wires 3 are assembled, it is difficult to reduce the diameter of the single-core wire 3 itself.
Densification has become even more difficult. In addition, since the arrangement of the single core wires 3 is also irregular, it is difficult to connect them in a batch.

In order to solve the above-mentioned problems, the structure of the optical fiber tape cord according to the present invention achieves a high-density optical fiber, that is, a small-diameter optical fiber.
It is an object of the present invention to provide a tape cord structure capable of improving connectivity, that is, multi-core batch connection.

[0005]

In order to solve the above-mentioned problems, the following means have been taken in the tape cord structure of the optical fiber of the present invention. That is, in the optical fiber tape cord structure according to the first aspect, a single-core optical fiber and a tensile member disposed at a specific position around the single-core optical fiber are formed as one unit of a single-core wire. In a tape cord structure of an optical fiber which is formed by arranging a plurality of single-core wires in parallel on a same plane in a plurality of units and collectively covering them with a coating material,

[0006] A notch is formed on at least one of the upper surface and the lower surface of the coating layer covered with the coating material, which serves as a base point for dividing each single core wire.

In this tape cord structure of an optical fiber, a notch is formed in the covering layer as a base point for dividing each single fiber, so that the notch is covered with each covering material when necessary. Can be divided for each single-core wire. Therefore, the work of separating each single core wire is easy and reliable.

In the tape cord structure of an optical fiber according to the second aspect, in the tape cord structure of the optical fiber according to the first aspect, when each single core wire is separated from the notch as a base point. In addition, the optical fiber and the tensile strength wire are arranged at positions separated from a surface from which the optical fiber is separated.

[0009] In the tape cord structure of the optical fiber, when the single fiber is separated from the notch as a base point, it can be separated into the optical fiber and the tensile member.

According to a third aspect of the present invention, in the tape cord structure of an optical fiber according to the first or second aspect, the strength member is formed from the optical fiber strand. It is characterized in that it is arranged at a position separated in the thickness direction of the tape cord.

In this optical fiber tape cord structure, since the tensile strength member is arranged apart from the optical fiber in the thickness direction, only the tensile strength wire can be easily removed from the tape cord structure. By forming a tape-shaped core wire in which only the optical fiber wires are arranged in parallel on the same plane, batch connection with a normal tape core wire becomes possible.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a tape cord structure of an optical fiber shown as one embodiment of the present invention. Optical fiber tape cord 11 shown in FIG.
Are a plurality of optical fiber strands 15, 15,... Arranged in parallel on the same plane, and each of the optical fiber strands 15, and tensile strength fibers 17, 17 which are tensile strength members disposed at specific positions around the optical fiber strands 15. ,... As one unit, and one unit of these, that is, a plurality of single wires 21 are arranged in parallel on the same plane, and the periphery thereof is collectively covered with a plastic covering layer 23 which is a covering material. It is formed.
Each of these single wires 21, 21,... Can be divided for each unit.

More specifically, the plastic coating layer 23
At least one of the upper surface and the lower surface (both the upper surface and the lower surface in this figure) is formed with a notch 31 serving as a base point for dividing each single core wire 21. Further, the tensile strength fibers 17 are made of the optical fiber wires 15, 15,
Are arranged on the same plane at a position separated by a predetermined distance L or more in the thickness direction from the region in which are arranged in parallel.

In this optical fiber tape cord 11,
By forming the notch 31, as shown in FIG. 2, it is possible to easily vertically divide the end of the cord 11 with this as a base point, and to easily divide the single core wire 21. I have.

FIGS. 3 to 5 show modifications of the tape cord structure of the optical fiber shown in this embodiment. In the tape cord structure of the optical fiber shown in FIG. 3, the tensile strength fiber 17 which is a tensile strength member is formed by the upper surface (or lower surface) of the strand 15.
Are vertically arranged only on one of the two. Then, a notch 31 is formed on the plastic coating layer 23 located on the upper surface thereof.
Are formed. In such a structure, separation of each single fiber 21 is easy as in the case of the optical fiber tape cord structure described in the above embodiment, and further higher density as the optical fiber tape cord structure itself is achieved. Becomes possible.

In the optical fiber tape cord structure shown in FIG. 4, tensile strength fibers 17 are alternately arranged vertically above, below, above, and below every adjacent strand 15. And the notch 31 is provided in both upper and lower sides.
In the tape cord structure of the optical fiber shown in FIG. 5, a tensile fiber 17 as a tensile member is vertically attached to only one of the upper surface (or lower surface) of the strand 15. The notch 31 is formed in the plastic coating layer 23 located on the upper surface. Even in such a structure, separation of each single core wire 21 is easy, and further higher density as the tape cord structure of the optical fiber itself is possible.

Also, the optical fiber tape structure of the present invention
It can also be applied as shown in FIG. That is, for example, a structure similar to the tape structure shown in FIG. 3 (FIG. 6A)
6), after the plastic coating layer 23 is stripped from the outside and the tensile strength fibers 17 are collectively removed, only the optical fiber 15 is coplanar as shown in FIG. The tape-shaped cords arranged in parallel with each other can be formed. Therefore, collective connection with a normal tape core becomes possible. At this time, the place where the tensile strength fiber 17 has been present becomes uneven, but even in this state, there is almost no effect on the connection workability with the tape core wire, and connection with a normal 8-core tape is possible. is there.

In the present embodiment, the high tensile strength fiber is used as an example of the tensile strength member, but a steel wire or the like may be used as the tensile strength member. In addition, the notch is provided so as to be dividable with the notch as a base point for each single fiber, but a structure in which a notch is provided for each of a plurality of single fibers may be used as necessary. Furthermore, as a means for facilitating the operation of dividing the wire into single wires, a structure in which a notch is formed has been described as an example, but a structure having a cut may be used.

[0019]

As described above, the optical fiber tape cord structure of the present invention has the following effects. That is, in the method for manufacturing an optical fiber cord according to the first and second aspects, the density of the optical fiber tape cord can be increased, and the operation of dividing the single-core fiber can be easily performed. In addition, there is an effect that the opening property of a single part of the cord is improved.

In the tape cord structure of an optical fiber according to the third aspect, in addition to the above-described effects, by removing the tensile strength members collectively, a tape-shaped core in which only the optical fibers are arranged side by side. Since it is a wire, there is an effect that batch connection with a normal tape core wire becomes easy.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a tape cord structure of an optical fiber shown as an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a tape cord structure of an optical fiber shown as an embodiment of the present invention, and illustrates a situation where each single fiber is separated at an end of the tape cord structure of the optical fiber. It is a schematic diagram.

FIG. 3 is a first modification of the optical fiber tape cord structure of the present invention.

FIG. 4 is a second modification of the optical fiber tape cord structure of the present invention.

FIG. 5 is a third modified example of the optical fiber tape cord structure of the present invention.

FIG. 6 is a schematic view showing a tape cord structure of an optical fiber shown as one embodiment of the present invention,
FIG. 4 is a sectional view showing a tape cord structure similar to that of FIG. 3;
(B) is sectional drawing which showed the structure of the tape core wire after removing the tensile strength wire.

FIG. 7 is a cross-sectional view showing the structure of a conventional optical fiber cord.

[Explanation of symbols]

11: Optical fiber tape cord, 15: Optical fiber, 17: Tensile fiber, 21: Single fiber, 23: Plastic coating layer, 31: Notch

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[Procedure amendment]

[Submission date] March 17, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0002

[Correction method] Change

[Correction contents]

[0002]

2. Description of the Related Art In general, an optical fiber cord cable used for a cable connecting between frames in a station has a structure as shown in FIG. That is, as the cord cable 1, a cable having a structure in which a plurality of single-core cords 3 having an outer diameter of about 2 mm are assembled. This single core code 3
Has a structure in which a tensile strength fiber 7 as a tensile strength member is vertically arranged on an optical fiber 5 having an outer diameter of about 0.9 mm, and a coating layer 9 is formed by coating the outermost layer with vinyl or the like.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0003

[Correction method] Change

[Correction contents]

[0003]

In recent years, there has been a demand for an optical fiber having a higher density, that is, a smaller diameter, and an improvement in connectivity, that is, a possibility of multi-core collective connection. However, as described above, in a cable in which a plurality of single-core cords 3 are assembled, it is difficult to reduce the diameter of the single-core cord 3 itself. It was even more difficult. Also, simply
Since the arrangement of the cords 3 is also irregular, it is difficult to connect these cords at once.

[Procedure amendment 3]

[Document name to be amended] Drawing

[Correction target item name] Fig. 7

[Correction method] Change

[Correction contents]

FIG. 7

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Keiji Ohashi 1440 Mutsuzaki, Sakura City, Chiba Prefecture Inside the Fujikura Sakura Plant (72) Inventor Kazutake Moto 3-19-2 Nishishinjuku, Shinjuku-ku, Tokyo Nippon Telegraph and Telephone Telephone Co., Ltd. (72) Inventor Masao Tachikura Nippon Telegraph and Telephone Co., Ltd.

Claims (3)

[Claims] 1. A single-core optical fiber and a tensile member disposed at a specific position around the single-core optical fiber are defined as a single-unit single-core wire, and the single-unit single-core wires are arranged in parallel on a same plane by a plurality of units. In the tape cord structure of the optical fiber which is formed by being covered by the covering material at a time, at least one of the upper surface and the lower surface of the covering layer covered by the covering material is provided with the single-core wire. A tape cord structure for an optical fiber, wherein a notch serving as a base point for dividing the optical fiber is formed. 2. The optical fiber tape cord structure according to claim 1, wherein when the single notch is separated from the notch as a base point,
The optical fiber tape cord structure according to claim 1, wherein the optical fiber and the tensile strength wire are arranged at positions separated from a surface from which the optical fiber is separated. 3. The tape cord structure of an optical fiber according to claim 1, wherein the strength member is disposed at a position separated from the optical fiber in a thickness direction of the tape cord. An optical fiber tape cord structure characterized by the above-mentioned.