JPH09159890A - Termination part structure of optical fiber cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the time of wiring operation by making the wiring operation easy and secure. SOLUTION: At an end part of the optical fiber cable 1, five ribbons 3... of coated optical fibers projected from respective slots 2a of a center member 2 are individually coated to form an optical fiber cord 5. The five optical fiber cables 5 projecting from the same slots are put one over another in the same array with the slots and coated together with a tube 11, so that the five optical fiber cords 5 are bundled as a cord assembly 12, one by one. While an MT connector is connected to each ribbon 3 at the tip end side of each cord assembly 12, the part from each ribbon 3 at the end part of the optical fiber cable 1 to the displacement part to the cord assembly 12 is sheathed with a pipe member 6a, which is filled with an adhesive to fix the ribbon.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a termination part of an optical fiber cable for connecting with another optical fiber cable or equipment when wiring an optical fiber cable containing an optical fiber tape core wire. Regarding the structure.

[0002]

2. Description of the Related Art Conventionally, as a termination structure of an optical fiber cable of this type, it is converted into an optical fiber cord by protecting each tape core wire of a predetermined length exposed from the end of the optical fiber cable. However, it is known that a connector is connected to the tip (for example, "To build an intelligent building-wiring system in a building-",
Edited and published by The Telecommunications Association of Japan, released by Ohmsha Co., Ltd., issued on July 20, 1990, pp. 82-100 "3.
(3) Optical fiber premises wiring technology (SM optical fiber edition) ”). An example of such a termination structure will be described with reference to FIG. 1. The optical fiber cable 1 has a plurality of spiral slots 2a, 2a, ... Formed on the outer peripheral surface of the central member 2.
Five tape core wires (four-core tape core wires) 3, 3, ... Are accommodated in a laminated state, and the periphery thereof is protected by a sheath 4. Then, each tape core wire 3 has a predetermined length (for example, 5 m) necessary for connection wiring from the end portion of the central member 2.
The optical fiber cords 5, 5, ... (See FIG. 2) are converted by coating each tape core wire 3 with the coating 5a. A pipe member 6a is covered on a portion on the base end side to be converted into each of the optical fiber cords 5, and a filler such as an adhesive is filled inside to fix the optical fiber cords 5 on the base end side. On the other hand, at the tip end side of each optical fiber cord 5, an MT connector (Mechanical) of four cores collectively for each of the four optical fiber cores 3a in each tape core 3 is provided.
ly Transferable Connector; see FIG. 2) 7, 7, ... Are connected to form a terminating portion 8a. Then, as shown in FIG. 3, in the wiring cabinet 9, the MT connectors 7 of the termination 8a are fitted to the MT connectors 7 of the termination 8a, for example. Connected via pins.

Here, each of the above-mentioned tape core wires is composed of a four-core tape core wire, and the central member of the optical fiber cable has ten slots, and five tape core wires are housed in each slot. And one optical fiber cable
The optical fiber has 00 optical fiber cores, which are 50 taper cores, that is, 50 optical fiber cords, so that the terminating portion 8a is constituted. Alternatively, if the central member has 15 slots, the number of optical fiber core wires is 300, and the termination portion 8a is composed of 75 optical fiber cords.

[0004]

However, in the above-mentioned conventional termination structure of the optical fiber cable, 50
A large number of 75 ribbons are individually converted into optical fiber cords 5, 5, ... And are independent from each other over a considerably long extension distance L to the MT connector of, for example, 5 m. Difficulty in identification and handling of each optical fiber cord 5 occurs during wiring work.
This causes an inconvenience that a lot of time is required for wiring work. That is, since many tape core wires have a fairly thin and flat rectangular cross section, and each optical fiber cord also has a flat rectangular cross section, it is twisted during wiring work, and moreover, between multiple optical fiber cables. I often get entangled with each other. In this case, if it is left untwisted, the transmission loss will increase. Therefore, there is no choice but to perform the wiring work while taking the twist of each of the many optical fiber cords.
This is a very complicated work.

The present invention has been made in view of such circumstances, and an object thereof is an optical fiber cable capable of facilitating and ensuring the wiring work and shortening the wiring work time. To provide a termination structure.

[0006]

In order to achieve the above object, the invention according to claim 1 accommodates a large number of tape core wires formed by collectively covering two or more optical fiber core wires in a tape shape. An optical fiber cable is formed, each of the tape core wires of a predetermined length is exposed and protrudes from the end of the optical fiber cable, and a connector is connected to the tip of each of the protruded tape core wires, while the above A termination structure of an optical fiber cable in which each tape core wire from the end portion of the optical fiber cable to the connector is individually covered and protected to form an optical fiber cord is targeted. In this structure, a plurality of the above-mentioned optical fiber cords are integrated into a cord assembly that is bundled in a laminated state.

In the case of the above construction, since the optical fiber cords from the end of the optical fiber cable to the connector are integrated as a cord assembly for every plural cords, the same number of optical fibers as the tape core wire are provided. The code is converted into the above code group, and the number thereof is greatly reduced. For this reason, the work for identifying the optical fiber code is greatly reduced as the number of the optical fibers is greatly reduced, and the identification property is improved. Moreover, since the above-mentioned cord assembly is formed by bundling a plurality of optical fiber cords in a laminated state, it is more difficult to twist as compared with the case of the optical fiber cord alone, and even if twisted, the optical fiber is quite thin and flat. The chords are thicker than the chords alone, and it is easier to take the chords. Therefore, the handling of each cord at the terminating portion can be improved.

According to a second aspect of the present invention, in the first aspect of the present invention, as a cord assembly, the periphery of each of the plurality of optical fiber cords is covered with a covering material having flexibility for substantially the entire length and laminated. To unite.

In the case of the above construction, the cord assembly is covered with the covering material to be easily formed, and moreover, the plurality of optical fiber cords are surely bound in a laminated state. Moreover, since the above covering material has flexibility, the handleability of the integrated cord assembly can be maintained well.

According to a third aspect of the present invention, in the invention according to the first aspect, a plurality of optical fiber cords are inserted into flexible tubes as a cord assembly to bind them in a laminated state. is there.

In the case of the above configuration, the cord assembly is easily formed by inserting the cord assembly into the tube, and the plurality of optical fiber cords are surely bound in a laminated state.
Moreover, as in the case of the second aspect of the present invention, since the tube has flexibility, the handleability of the integrated cord assembly can be favorably maintained.

According to a fourth aspect of the invention, in the third aspect of the invention, the tube is made of synthetic resin.

In the case of the above construction, the tube of the invention of claim 3 is easily constructed by forming the tube from synthetic resin.

According to a fifth aspect of the present invention, in the third aspect of the present invention, a tear cord is arranged in the tube so as to be in close contact with a part of the inner peripheral surface thereof and extend in the longitudinal direction.

In the case of the above construction, the peripheral wall of the tube is torn in the longitudinal direction by pulling the tear cord from the end of the cord assembly from the outside toward the front in the longitudinal direction. For this reason, the plurality of optical fiber cords bundled inside are easily separated, and the work of connecting the connector to the tip portion of each optical fiber cord is facilitated.

According to a sixth aspect of the invention, in the third aspect of the invention, the cord assembly is integrated for every five optical fiber cords.

In the case of the above construction, since the cord assembly is integrated for every five optical fiber cords, the number of cords existing between the end portion of the optical fiber cable and the connector is the same as the conventional termination. It is reduced to 1/5 of that of the partial structure.

Further, the invention according to claim 7 is based on claim 1.
In the invention described, the optical fiber cable, a plurality of tape core wire is stored in each of a plurality of slots formed on the outer peripheral surface of the central member of the circular cross-section, a plurality of stored in each slot The tape cores are integrated into a cord assembly.

In the case of the above configuration, the plurality of tape core wires housed in the respective slots of the optical fiber cable are converted into the same number of optical fiber cords, and the plurality of optical fiber cords constitute one same cord assembly. Be integrated. For this reason, one code assembly is formed for each slot of the optical fiber cable, which improves the identifiability of each optical fiber code, that is, each tape core wire, and facilitates the handling of the code assembly for identification. Improvement is achieved.

[0020]

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

FIG. 4 shows a part of the termination structure of the optical fiber cable of the present invention, and FIG. 5 schematically shows the procedure for forming the termination.

In the figure, reference numerals 1, 2, 3, 5 and 5a respectively denote an optical fiber cable, a central member, and
Reference numeral 11 denotes a tape core wire, an optical fiber cord, and a coating body for forming an optical fiber code, 11 denotes a tube for forming a cord assembly, and 12 denotes a cord assembly.

The optical fiber cable 1 and the like will be described in detail. As shown in FIG. 6, the optical fiber cable 1 includes a central member 2 in which a tension member 2b is embedded in the center, and spiral members of the central member 2. Slot (concave groove)
5 tape cores 3, each of which is stored in a laminated state on 2a
3, and a sheath 4 that protects the outer periphery of these. Here, as shown in FIG. 7, the tape core wire 3 is formed by arranging a plurality of optical fiber core wires 31, 31, ... Side by side and collectively covering them with a synthetic resin such as an ultraviolet curable resin to form a tape shape. It is a thing. An expanded diameter portion 4a is formed continuously with the sheath 4 at the end of the optical fiber cable 1, and the central member 2 is slightly protruded from the expanded diameter portion 4a.
Five tape cores 3, 3, ... Are projected from a at a length of about 5 m.

In FIG. 6, ten spiral slots 2a, 2a, ... Are formed around the center member 2, and five tape cores 3 of four cores are housed in each slot 2a. Example, ie 200 per fiber optic cable 1
.. (50 tape core wires) is stored in the optical fiber cable 1. If the number of the slots 2a is 15, the number of the optical fiber cables 1 is 300.
.. (75 tape cores) of the optical fiber cores 31, 31 ,. Further, FIG. 7 illustrates a four-core tape core wire 3 provided with four optical fiber core wires 31, 31, ..., In addition to this, one tape core wire 3 has two optical fibers. It may be applied to a core wire (2 cores) or one provided with 5 optical fiber core wires (5 cores).

Next, the projecting tape core wires 3 are covered with a covering member 5a over the entire length thereof, and the respective tape core wires 3 are provided with the same number of optical fiber cords 5 ( (See FIG. 2). As shown in FIG. 8, the covering 5a has a tube 51 having an inner hollow cross-sectional shape larger than the cross-sectional shape of each tape core wire 3 on the inner peripheral side.
And a cushioning member 52 disposed so as to surround the tube 51, and a synthetic resin jacket 53 that covers the periphery of the cushioning member 52. The tube 51 is made of, for example, nylon so as to exhibit flexibility, the cushioning member 52 is made of, for example, a Kevlar fiber bundle, and the jacket 5 is used.
3 is made of, for example, PVC (polyvinyl chloride) so as to exhibit flexibility. Then, the optical fiber cord 5 connects each tape core wire 3 to the tube 5
The outer cover 53 is formed by extruding the outer cover 53 with the buffer member 52 along the periphery in a state where the outer cover 53 is inserted into the outer cover 1.

After that, one synthetic resin is provided for each of the five optical fiber cords 5, 5, ... Formed by the five tape core wires 3, 3, ... Stored in each slot 2a of the central member 2. The cord assembly 12 (see FIG. 9) is formed by covering with a tube 11 made of. That is, in the case of the example shown in the figure, 50 optical fiber cords 5, 5, ... Are gathered for every 5 optical fiber cords 5, 5 ,. 12, 12, ...
In this case, as shown in FIGS. 9 and 10, each cord assembly 12 has a tube 11 with its outer periphery in a state where the above five optical fiber cords 5, 5, ... Which is covered by
The five optical fiber cords 5, 5, ... Are bundled in a laminated state. Here, the tube 11
Is formed of, for example, PVC so as to exhibit flexibility. Then, such a cord assembly 12 is formed by stacking the above five optical fiber cords 5, 5, ... And collecting them, and extruding the tube 11 around the outer periphery thereof. Further, at the time of this extrusion molding, tear cords 14, 14 made of steel wire, piano wire or Kevlar wire having a small diameter (for example, 0.1 mm diameter) are cord-assembled at the corners on the inner peripheral surface side of the tube 11. A small amount of protrusion from the tip end of the body 12 is provided along the outer peripheral surface for a predetermined length in the longitudinal direction from the tip end of the laminated optical fiber cords 5, 5, ... Each of the tear cords 14 is embedded in the inner peripheral surface side of the portion.

Next, 4 of each tape core wire 3 in each of the five optical fiber cords 5, 5, ...
Connect the MT connector 7 for the whole heart. At the time of this connection, each of the tear cords 14 (see FIG. 10) projecting from the tip end of each cord assembly 12 is pulled toward the front and the outside so that the corner portion of the tube 11 is required for the connector connection work in the longitudinal direction. By tearing and cutting off the length and separating the five optical fiber cords 5, 5, ... from each other, the connection work to each MT connector 7 becomes easy. This completes the formation of the terminating portion 8 of the optical fiber cable 1.

Before or after the connection work with each MT connector 7, all the cord assemblies 12, 1 are connected.
2, ... are inserted into the pipe member 6a (see FIG. 1), and the pipe member 6a is expanded into the expanded diameter portion 4a of the optical fiber cable 1.
Then, the pipe member 6a is filled with a filler such as an adhesive, and the filler is injected into the pipe member 6a. As a result, each cord assembly 1 starts from the end of the optical fiber cable 1.
The code conversion unit 6 that protects the conversion part to 2 is formed.

In the case of the terminating structure of the optical fiber cable of the present embodiment having the above-mentioned structure, each cord assembly 12 is integrated into each of the five optical fiber cords 5, 5 ,.
In the conventional terminating portion 8a (see FIG. 1), the optical fiber cable 1 has 50 optical fiber cords when it has 200 optical fiber core wires 31, 31, ..., and 75 optical fiber cords when it has 300 fiber cores. What was divided into 5, 5, ..., 10 for 200 cores, 1 for 300 cores
It will be divided into five code aggregates 12, 12, .... That is, each M from the end of the optical fiber cable 1
The number of cords existing up to the T connector 7 is
In the 200-fiber optical fiber cable 1, the conventional 50 cables are reduced to 10 in the present embodiment, and the 300 fibers are reduced from the conventional 15 cables to 15 in the present embodiment to 1/5, respectively. Therefore, in the termination portion 8 of the optical fiber cable 1, the number of cord portions that are separated from each other is reduced, so that the cord portion (cord assembly 12) can be identified and handled in the wiring work of the termination portion 8. It is possible to achieve a dramatic improvement.

Moreover, in the present embodiment, the five tape core wires 3, 3, 3 ... Arranged in the same slot 2a of the optical fiber cable 1 are put together as one same cord assembly 12, and The five tape cores 3, 3, ...
Are laminated in the same arrangement as the slots 2a, it is possible to easily and quickly identify each tape core wire 3 in the MT connector 7 at the tip of each cord assembly 12.
Along with the decrease in the number of lines, it is possible to significantly reduce the labor for identification work.

Further, since the five optical fiber cords 5, 5, ... Are bundled together by the tube 11 of each cord assembly 12 in the stacked state, the conventional optical fiber cord alone in the termination portion 8a is used. The cord assembly 12 can be made less likely to be twisted as compared with the above, and is even thicker than the case of a single flat optical fiber cord even if twisted.
Therefore, it is possible to easily and swiftly perform the work of taking the wire. Therefore, it is possible to further improve the handleability of each cord portion (cord assembly 12) in the terminating portion 8.

Therefore, the time required for connecting and wiring the optical fiber cable 1 can be greatly shortened. Further, since each optical fiber cord 5 is further protected by the tube 11, when the optical fiber cable 1 with the terminating portion 8 is packed for shipping as a product, the terminating portion 8 is further protected. Can be achieved.

Further, each cord assembly 12 can be formed easily and surely only by covering the tube 11 by extruding and molding every five optical fiber cords 5, and furthermore, the tube 11 can be formed. Since it has flexibility, the handleability of each integrated cord assembly 12 can be favorably maintained.

Further, the tear cord 1 is attached to each cord assembly 12.
Since 4, 4 and 14 are provided, each tape core wire 3 can be easily separated at the time of connection work of each tape core wire 3 and the connector 7, and connection work with the MT connector 7 can be easily performed.

<Other Embodiments> The present invention is not limited to the above-described embodiments, but includes various other embodiments. That is, in the above embodiment,
The tube 11 is covered over substantially the entire length of the five optical fiber cords 5, 5, ... However, the present invention is not limited to this, and the tube 11 may be partially covered and bound.

In the above-mentioned embodiment, the tube 11 is used to form the cord assembly 12, but the present invention is not limited to this, and the five optical fiber cords 5 are made of a flexible covering material such as an adhesive tape. The optical fiber cords 5, 5, ... May be wound around the outer periphery of the optical fiber cords 5, 5 ,.

Further, in the above-described embodiment, five tape core wires 3, 3, ... Are arranged in each slot of the optical fiber cable 1, and the optical fiber cords 5 for the five tape core wires 3, 3 ,.
, 5 are collectively arranged as the cord assembly 12, but the number is not limited to this, and if there are four tape core wires 3 in each slot, the optical fiber cords 5, 5 ,.
Can be collectively made into a code aggregate, and if there are six, the six can be collectively made into a code aggregate.

[0038]

As described above, according to the terminating structure of the optical fiber cable in the invention described in claim 1,
It is possible to significantly reduce the number of cord portions that are separated from each other and exist between the end of the optical fiber cable and each connector, and the reduction of the number of cord portions itself leads to wiring of the termination portion. It is possible to significantly improve the identifiability and handling of the code portion (code assembly) in the work. Moreover, by using the above cord assembly, it is possible to make it more difficult to twist than the conventional optical fiber cord at the terminating portion, and even if it is twisted, it is thicker than the case of a single thin and flat optical fiber cord. Since it becomes a code aggregate, it is possible to easily and swiftly perform the work of taking the cord. Therefore, it is possible to significantly reduce the time required for the connection and wiring work of the optical fiber cable.

According to the second aspect of the invention, in addition to the effect of the first aspect of the invention, the cord assembly can be easily and surely formed by the covering material and the flexibility of the covering material makes it integral. It is possible to favorably maintain the handleability of the converted code assembly.

According to the third aspect of the invention, in addition to the effect of the first aspect of the invention, the cord assembly can be easily and surely formed by the tube, and the cord assembly is integrated by the flexibility of the tube. It is possible to maintain excellent handling of the cord assembly.

According to the invention of claim 4, the tube of the invention of claim 3 can be easily constructed.

According to the invention of claim 5, in addition to the effect of the invention of claim 3, the presence of the tearing string allows
The plurality of optical fiber cords bundled inside can be easily separated, and the connector can be easily connected.

Further, according to the invention of claim 6, in addition to the effect of the invention of claim 3, the number of cords existing between the end of the optical fiber cable and the connector is changed to the conventional termination. It can be greatly reduced to 1/5 of the structure.

Furthermore, according to the invention of claim 7, in addition to the effect of the invention of claim 1, the same number of optical fiber cords for a plurality of tape core wires housed in each slot of the optical fiber cable. Can be integrated as one and the same cord aggregate, and one cord aggregate can be formed for each slot of the optical fiber cable. Therefore, it is possible to further improve the identifiability of each tape core wire in the connector portion and the operability of the cord assembly for identification.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a part of a conventional termination structure of an optical fiber cable.

FIG. 2 is a perspective view showing a conventional termination structure of an optical fiber cable.

FIG. 3 is a schematic diagram in the case of connecting wiring between the terminations.

FIG. 4 is a view corresponding to FIG. 1 showing a termination structure of an optical fiber cable according to an embodiment of the present invention.

5 is an exploded perspective view schematically showing a procedure for forming the termination portion of FIG.

6 is an enlarged cross-sectional view taken along the line AA of FIG.

FIG. 7 is an enlarged cross-sectional view of a tape core wire.

FIG. 8 is an enlarged sectional view of an optical fiber cord.

9 is an enlarged cross-sectional view taken along the line BB of FIG.

FIG. 10 is a perspective view showing a tip portion of a cord assembly.

[Explanation of symbols]

 1 Optical Fiber Cable 2 Center Member 2a Slot 3 Tape Core Wire 5 Optical Fiber Cord 7 MT Connector (Connector) 8 Termination 11 Tube 12 Cord Assembly 14 Tear String

Claims (7)

[Claims] 1. An optical fiber cable is constructed by accommodating a large number of tape core wires formed by covering two or more optical fiber core wires together in a tape shape, and an optical fiber cable having a predetermined length from an end portion of the optical fiber cable. Each of the tape core wires is exposed and protrudes, and a connector is connected to the tip of each of the protruded tape core wires, while each tape core wire from the end of the optical fiber cable to the connector is individually In a termination structure of an optical fiber cable which is a protectively coated optical fiber cord, a plurality of the optical fiber cords are integrated as a cord assembly bundled in a laminated state. Optical fiber cable termination structure. 2. The cord assembly according to claim 1, wherein the circumference of each of the plurality of optical fiber cords is covered with a flexible covering material over substantially the entire length and is bound in a laminated state. Optical fiber cable termination structure. 3. The optical fiber cable according to claim 1, wherein each of the plurality of optical fiber cords is inserted into a flexible tube and bundled in a laminated state. Termination structure. 4. The terminating structure for an optical fiber cable according to claim 3, wherein the tube is made of synthetic resin. 5. The terminating portion of an optical fiber cable according to claim 3, wherein a tearing string is provided on the tube so as to be in close contact with a part of an inner peripheral surface of the tube so as to extend in a longitudinal direction. Construction. 6. The termination structure for an optical fiber cable according to claim 3, wherein the cord assembly is integrated for every five optical fiber cords. 7. The optical fiber cable according to claim 1, wherein a plurality of tape core wires are housed in each of a plurality of slots formed on the outer peripheral surface of the central member having a circular cross section, and each of the slots is provided in each of the slots. A termination structure of an optical fiber cable, which is configured to be integrated as a cord assembly for each of a plurality of accommodated tape core wires.