JPH09105821A - Terminal processed structure of optical fiber cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a terminal processed structure of the optical fiber cable which facilitates the machining of optical fiber cable termination and is small- sized, lightweight, and small in volume by forming a thin rod having projection parts removed. SOLUTION: Projection parts of grooves 104 formed in a slot rod 102 are ground away to from a rod 1 which is a size smaller and has a smooth surface. Then spiral tubes made of flexible resin are wound by coated optical fibers 105 put in the grooves 104 and run in a pipe 2. Further, a both-sided adhesive tape is wound around the part of the rod 1 and the pipe 2 into which the coated optical fibers 105 are inserted is stuck almost equally on the both-sided adhesive tape together. Then the pipe 2 is wound with a PCV tape 3 several times to fix the pipe 2 to the rod 1. A connection part is almost a half as thick and wide as before, the weight and volume are less than usual, and the operability is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal treatment structure for a slot type optical fiber cable.

[0002]

2. Description of the Related Art As a processing structure of a cable core wire led out from a terminal of a slot type optical fiber cable, for example, a structure shown in FIG. 4 is adopted.

FIG. 5 is a view showing a general internal structure of the slot type optical fiber cable, and FIG. 6 is a side sectional view showing the internal structure of the case in FIG.

First, the internal structure of the optical fiber cable 101 will be described with reference to FIG. In addition, although the actual number of tape core wires constituting the optical fiber cable is 250 and the number of slot grooves is 13, in FIG. 5, the slot grooves are schematically shown by 6 pieces.

As shown in FIG. 5, the optical fiber cable 1
Reference numeral 01 denotes a round rod-shaped slot rod 102 made of polyethylene or the like, a tension member 103 inserted through the center of the slot rod 102, and the slot rod 10
2 a plurality of SZ slot grooves 10 formed in the longitudinal direction
4, an optical fiber core wire 105 respectively housed in the SZ slot groove 104, and a press winding layer 106 in which a non-woven tape is wound around the slot rod 102,
It is composed of the outermost PVC sheath 107.

Next, the structure of the termination K will be described with reference to FIG. As shown in FIG. 4, a PVC sheath 107 of about 5 m on the tip side of the optical fiber cable 101 and the press-winding layer 10 are provided.
6 is peeled off, and the slot rod 102 is cut near the root. Then, the part from which the PVC sheath 107 and the like are peeled off is covered with a case 111 made of hard polyvinyl chloride having a length of about 40 cm shown in FIG. 6, and the connecting part between the case 111 and the optical fiber cable 101 is covered. A shrink tube 112 is overlaid. The inside of the case 111 is covered with a reinforcing tube 113 that protects the 250 optical fiber core wires 105 that have been separated.
The tip end portion of the tension member 103 is fixed to the fixing plate 114 with a nut, and the bond wire 115 is connected to the tension member 103 and is drawn to the outside. 10
5 is an optical fiber core wire, 116 is a spacer,
Reference numeral 117 is a filling resin in which a polyurethane resin is poured.

Further, in FIG. 4, the reinforcing tube 113
There are 250 optical fiber core wires 105 covered with
The tip end side of the optical fiber core wire 105 is a cord retaining portion 121.
The MT connector 122 is connected via.

[0008]

However, as is clear from FIGS. 4 to 6, in the cable terminal with connector, each of the tape cores (optical fiber cores) is coded by passing through the reinforcing tube, The end of the cable was very heavy, bulky, and the length of the reinforcing tube was 5 to 6 m, and the volume occupied was extremely large.

Further, in order to fix one end of the reinforcing tube 113, each reinforcing tube is attached to a metal rod (tension member clamp) formed by extending the tension member of the cable at the end of the optical fiber cable. Was tying up the tensile strength fibers.

Further, the case has a length of 300 to 400 m.
m, the diameter was 3 to 6 times as large as the diameter of the cable, and the polyurethane resin entered inside, so it was also a very heavy object.

As described above, since the conventional optical fiber cable termination has various complicated structures, it requires a great deal of labor and a lot of time to process it, and improvement of workability is required. Was there.

Therefore, an object of the present invention is to provide an end treatment structure for an optical fiber cable, which can easily terminate the optical fiber cable, has a small size, and has a small weight and volume.

[0013]

In order to solve the above-mentioned problems, the invention according to claim 1 is a terminal treatment structure for a slot type optical fiber cable, wherein a groove of a slot rod of the slot type optical fiber cable is used. By removing the formed convex portion to form a slender rod, a plurality of optical fiber core wires led out from the slot type optical fiber cable are collectively inserted into a pipe, and further along the outer circumference of the slender rod. It is characterized in that the tape is wound so as to fix the pipe.

According to the invention described in claim 1, FIG.
As shown in (A), (B), and (C), the slot rod 102 is cut to form the slender rod 1. A pipe 2 in which a plurality of optical fiber core wires 105 are inserted is temporarily fixed to the rod 1 by, for example, a double-sided adhesive tape,
The outer periphery is wrapped with PVC tape and fixed in earnest.
In this way, as shown in FIG. 2, the thickness of the connecting portion is 50 mm at maximum and the width is about 200 mm, and both the thickness and the width are half of those of the conventional connecting portion.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in the drawings. Note that the same reference numerals are given to the already described portions, and redundant description is omitted.

(1) First Embodiment Example FIGS. 1A, 1B, and 1C are diagrams showing a termination process. First, as shown in FIG. 1 (A), the PVC sheath 107 and the press-wrap layer 106 are stripped off for about 5 m, and the slot rod 102 is cut off at the tip side leaving an exposed portion of about 10 cm.

Next, as shown in FIG. 1B, the portion of the groove 104 formed in the slot rod 102 (the convex and concave portions) is shaved off to form the rod 1 having a slightly thinner smooth surface. Next, for each optical fiber core wire 105 inserted in the groove 104, for example, in a WBA cable with a single slot of 1000 cores, 10 pieces of 8-core tape are put together, and a flexible resin spiral tube is wound. Through the pipe (spiral tube) 2 (note that since it is complicated in FIG. 1, only one pipe is shown for insertion). Furthermore, the rod 1 formed as described above
A double-sided adhesive tape is wound around the area of (1), and the pipe 2 in which the optical fiber core wire 105 is inserted is attached to the double-sided adhesive tape substantially evenly.

Then, as shown in FIG. 1C, the PVC tape 3 is wound in multiple layers over the pipe 2 attached to the double-sided adhesive tape as described above, and the optical fiber core wire 10 is then wound.
The pipe 2 in which 5 is inserted is fixed to the rod 1.

Through the processes described above, as shown in FIG. 2, the termination connecting portion is completed. As is clear from FIG. 2, the maximum thickness of the connecting portion is 50 mm, which is about half that of the prior art (see FIG. 6), and the width of the connecting portion is about 200 mm, which is about half that of the prior art. Therefore, the weight and volume are smaller than in the conventional case, and the workability is improved.

FIG. 3 is an overall configuration diagram of the termination created as described above. As is clear from this figure, the termination is smaller than the conventional one. Reference numeral 4 is an identification number seal having the same number as the slot number of the cable for identifying the optical fiber core wire.

As described above, the structure of the cable end portion (cable end processing structure) of this embodiment is extremely simple, and the weight of the cable end portion is greatly reduced. In addition, since the processing is easy and the parts are hardly used, the terminal part can be made extremely cheap.

Since the optical fiber core wire is passed through the spiral tube for each groove of the cable slot,
It is easy to identify the core wire.

Since the spiral tube is made of a flexible resin, it does not hinder the bending of the optical fiber core wire and reliably protects the core wire.

By attaching the spiral tube to the slot portion from which the mountain is removed, the spiral tube can be made small.

Conventionally, as shown in FIG. 4, since each optical fiber core wire 105 was covered with the reinforcing tube 113, the volume of the termination was enormous, but in the present embodiment example. According to this, since several optical fiber core wires are housed together in the pipe, the volume of the termination can be extremely reduced.

In this embodiment, the optical fiber cable with a connector has been described, but the present invention can be applied to a non-pulling cable terminal with a connector and termination in a closure. At this time, the length of the spiral tube may be 50 to 70 mm because it is only for identifying the optical fiber core wire.

[0027]

As described above, according to the present invention, the slender rod is formed by removing the convex portion formed by the groove of the slot rod of the slot type optical fiber cable. A plurality of the optical fiber cores that have been led out are collectively inserted into a pipe, and further, in order to fix the pipe along the outer periphery of the slender rod, since the terminal treatment of winding the tape is performed,
The thickness and width of the processing section can be reduced to about half of the conventional one.

[Brief description of the drawings]

FIG. 1 is a diagram showing a production process in an embodiment of the present invention.

FIG. 2 is an enlarged view of an essential part showing a completed state of a connection part of the embodiment example.

FIG. 3 is a diagram showing a completed state of the entire configuration of the same embodiment example.

FIG. 4 is a diagram showing an overall configuration of a conventional termination.

FIG. 5 is a schematic diagram showing an internal configuration of a conventional optical fiber cable.

FIG. 6 is a side sectional view showing a structure inside a conventional termination case.

[Explanation of symbols]

 1 Slender Rod 2 Pipe 3 PVC Tape 4 Identification Number Cable 101 Optical Fiber Cable 102 Slot Rod 104 Slot Rod Groove 105 Optical Fiber Core 106 Presser Winding Layer 107 PVC Sheath 111 Case 112 Shrinkable Tube

Claims (1)

[Claims] 1. A terminal treatment structure for a slot type optical fiber cable, wherein a convex portion formed by a groove of a slot rod of the slot type optical fiber cable is removed to form a slender rod. A plurality of optical fiber cores led out from a fiber cable are collectively inserted into a pipe, and further, a tape is wound so as to fix the pipe along the outer circumference of the slender rod. Fiber cable end treatment structure.