JPH0561705U - Optical fiber cable straight connecting material - Google Patents

Abstract

(57) [Summary] [Purpose] Simplify the assembly of the straight connecting material, save labor in the work, expand the degree of freedom of the processing passage of the optical fiber core, and prevent unreasonable bending and distortion. [Structure] The sheath of each of the two optical fiber cables is peeled off to expose the optical fiber core wire and the tension member housed therein. Then, the optical fiber core wires of the optical fiber cable are separately inserted into the optical fiber core wire through-holes of different tensile strength member mounting plates, and the tension members are inserted into the tensile strength member mounting portions of the tensile strength member mounting plates, and the ends of the tension members are inserted. Part to the strength plate mounting plate. The two optical fiber cables fixed to the separate strength member mounting plates are fitted into the strength member mounting plates in the two fitting grooves formed on the inner peripheral surface of the case constituted by the upper sleeve and the lower sleeve. To fix by. After that, in the optical fiber connection storage portion, the optical fiber cores are connected to each other and the extra length connection portions are stored in a loop shape.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a straight connecting material for an optical fiber cable, and more particularly to a straight connecting material for an optical fiber cable which simplifies the assembly of the straight connecting material and saves labor in construction.

[0002]

[Prior Art]

 Generally, an optical fiber is formed by heating, melting, and stretching an optical fiber preform in an electric furnace or the like. The optical fiber spun by being pulled out from the electric furnace is first coated with a thermosetting resin, and then introduced into a drying furnace, where the primary coating thermosetting resin is dried. After this, it is wound up on a winding drum and used as an optical fiber strand.

Since such an optical fiber has a remarkable difference in physical or mechanical characteristics from the conventional copper conductor, it is mechanically treated as an optical fiber core wire by applying a primary coating or a secondary coating. Various characteristics and easy handling. However, in the case of making a cable, if a large external force such as lateral pressure is applied to the optical fiber core, a slight bending (microbending) occurs in the optical fiber core, increasing the transmission loss. Manufacturing needs to be considered.

However, such an optical fiber is not infinitely long, and it may be necessary to connect it to another optical fiber on the way. This optical fiber connection differs from the conventional cable core connection in that the end surface of the optical fiber, which is about the size of hair, is cut so as to be extremely smooth, and the two optical fibers can be accurately butted against each other. is important. If the core, which is the part through which the optical fiber passes at the connection point, is not structurally and uniformly connected, the light signal emitted from one optical fiber will not be able to enter the other optical fiber and will be lost at the connection point. And the transmission mode distribution is disturbed. Moreover, it is necessary to have a strength that can support the tension of each optical fiber cable when the two optical fiber cables are connected.

Therefore, in recent years, in the linear connection of two optical fiber cables, a method of connecting using a linear connection material (closure) has been adopted. The conventional linear connecting material 100 of the optical fiber cable has a structure as shown in FIGS.

Reference numeral 110 denotes a connecting portion which connects the optical fibers of the two optical fiber cables to each other and holds and fixes the two optical fiber cables so as not to separate from each other. Reference numeral 120 is a cable gripping metal fitting for gripping and fixing one cable 500. Reference numeral 130 is a cable gripping metal fitting for gripping and fixing the other cable 600. Reference numeral 140 denotes a tensile strength stopper which holds and fixes the tension member 550 of the one cable 500. The tensile strength stopper 140 is attached to the fixed plate 150. Further, 160 is a tensile strength stopper for holding and fixing the tension member 650 of the other cable 600. The tensile strength stopper 160 is attached to a fixed plate 170. The tensile strength stoppers 140 and 160 have the function of supporting the tension of the optical fiber cable applied to the tension members 550 and 650 fixed to the tensile strength stoppers 140 and 160. The cable grip fitting 120 and the tensile strength stopper 140 are connected by the connecting tools 180, 190, and the cable grip fitting 130 and the tensile strength stopper 160 are connected by the connecting tools 200, 210.

Reference numeral 220 denotes a connecting fixture, which connects the tensile strength stopper 140 and the tensile strength stopper 160 and fixes them in order to keep a predetermined distance. An optical fiber connection surplus length processing unit 230 is attached to the connecting fixture 220. The connection surplus length processing unit 230 is a place where the optical fibers of the two optical fiber cables are taken longer and the surplus length portion in which the end portions are connected to each other is stored in a loop shape.

Reference numeral 240 is an upper sleeve, and 250 is a lower sleeve. The upper sleeve 240 and the lower sleeve 250 accommodate the connection part 110. 260 and 270 are end face plates fitted to the inner end portions of the upper sleeve 240 and the lower sleeve 250. The end plates 260 and 270 are for sealing the connecting portion 110 accommodating portions of the upper sleeve 240 and the lower sleeve 250.

[0009]

[Problems to be solved by the device]

 When connecting the two optical fiber cables 500 and 600 using such a connecting portion 110, first, the two optical fiber cables 500 and 600 are peeled off and the fiber core wire (not shown) The members 550 and 650 are exposed. Then, the optical fiber cables 500 and 600 are inserted into the cable grips 120 and 130, and the tension members 550 and 650 are inserted into the tensile strength stoppers 140 and 160. Then, the optical fiber cables 500 and 600 are gripped and fixed using the cable grip fittings 120 and 130, and the tension members 550 and 650 are gripped and fixed using the tensile strength stoppers 140 and 160. Then, the fiber cores of the two optical fiber cables 500 and 600 are connected to each other, and the extra length portion is looped and stored in the extra connection length processing unit 230.

However, in the conventional straight connecting material for the optical fiber cable, the tensile strength stoppers 140 and 160 are structurally complicated, such as being connected to the cable grips 120 and 130 by the connecting members 180, 190, 200 and 210. In addition to the above, the problem that the path of the optical fiber core wire is restricted by the connecting members 180, 190, 200, 210 and the optical fiber core wire is bent, and the loss easily increases due to the bending. Have a point.

The present invention has been made in view of the above problems of the conventional technique, and an object of the present invention is to simplify the assembly of the straight connecting material and to save the labor of the work. Therefore, the present invention aims to provide a straight connecting material for an optical fiber cable, which can broaden the degree of freedom of the processing path of the optical fiber core and prevent the occurrence of unreasonable bending and distortion.

[0012]

[Means for Solving the Problems]

 In order to achieve the above object, the straight connecting material of the optical fiber cable of the present invention forms two fitting grooves on the inner peripheral surface of the case formed by the upper sleeve and the lower sleeve, and the two fitting grooves are formed. In each of the mating grooves, a strength member mounting portion for fixing the strength member of the optical fiber cable and a strength member mounting plate having a plurality of holes penetrating the optical fiber core of the optical fiber cable are fitted, and An optical fiber connection accommodating portion for accommodating the connection portion of the optical fiber core wire is provided between the strength member attachment plates.

[0013]

[Action]

 The sheath of each of the two optical fiber cables is peeled off to expose the optical fiber core wire and the tension member housed therein. Then, the optical fiber core wires of the optical fiber cable are separately inserted into the optical fiber core wire through holes of the different tensile strength member mounting plates, and at the same time, the tension member is inserted into the tensile strength member mounting portion of the tensile strength member mounting plate to make the tension member. Secure the end of the to the strength member mounting plate. The two optical fiber cables fixed to the separate strength member mounting plates are attached to the two fitting grooves formed on the inner peripheral surface of the case formed by the upper sleeve and the lower sleeve. Secure by fitting. After that, in the optical fiber connection storage part, the optical fiber cores are connected to each other, and the extra length connection part is stored in a loop shape.

[0014]

【Example】

 Embodiments of the present invention will be described below. 1 to 3 show an embodiment of a straight connecting material for an optical fiber cable according to the present invention.

In the figure, reference numeral 1 denotes a linear connecting material for an optical fiber cable, which connects two optical fiber cables 2 and 3 linearly. Reference numeral 4 is an upper sleeve, and 5 is a lower sleeve, both of which are made of synthetic resin, and the upper sleeve 4 and the lower sleeve 5 form a case. Reference numeral 6 denotes a fitting groove formed around the inner wall surface of the lower sleeve 5, and the fitting groove 6 is formed continuously with the inner wall surface of the upper sleeve 4. Further, 7 is a fitting groove provided around the inner wall surface of the lower sleeve 5, and the fitting groove 7 is formed continuously with the inner wall surface of the upper sleeve 4.

Reference numeral 8 denotes a tensile strength member mounting plate having a structure as shown in FIG. That is, the strength member attachment plate 8 is formed in a disk shape, and the hole 10 that penetrates the tension member 9 of the optical fiber cable 2 is formed in the center. Reference numeral 11 denotes a protrusion formed in the center of the strength member attachment plate 8. The tension member 9 of the optical fiber cable 2 protruding through the hole 10 at the protrusion 11 is fixed by being crimped. There is. The hole 10 and the protrusion 11 form a tensile strength member mounting portion. Reference numeral 12 is a penetrating hole through which the optical fiber core wire 13 of the optical fiber cable 2 is passed. As described above, the strength member attachment plate 8 is attached by penetrating the tension member 9 of the optical fiber cable 2 into the hole 10 and penetrating the optical fiber core wire 13 of the optical fiber cable 2 into the hole 12, and then shown in FIG. As shown by an arrow A, the fitting groove 6 is fitted and fixed.

Reference numeral 14 is a strength member mounting plate, and the strength member mounting plate 14 is formed in a disk shape like the strength member mounting plate 8 shown in FIG. Holes 17 that penetrate the tension member 16 of the optical fiber cable 3 are provided in the central portion, and the projections 15 and the holes 17 form a strength member attachment portion. Further, the strength member attachment plate 14 is provided with a plurality of holes 19 for passing the optical fiber core wires 18 of the optical fiber cable 3.

Reference numeral 20 denotes an optical fiber connection accommodating portion, and the optical fiber connection accommodating portion 20 is an extra length connecting portion connecting the optical fiber core wire 13 of the optical fiber cable 2 and the optical fiber core wire 18 of the optical fiber cable 3. It is a storage container that is bundled in a loop and rolled up for storage. The optical fiber connection housing 20 prevents external force such as expansion and contraction, vibration, and lateral pressure due to temperature change from being directly applied to the optical fiber connection. The optical fiber connection storage section 20 is fixed to the inner wall surface of the lower sleeve 5.

As described above, since the tension member 9 of the optical fiber cable 2 is fixed to the strength member attachment plate 8, the tension applied to the optical fiber cable 2 is applied to the strength member attachment plate 8 via the tension member 9. Thus, the tension member mounting plate 8 is supported by the fitting groove 6 which is provided around the inner wall surfaces of the upper sleeve 4 and the lower sleeve 5. Moreover, since the tension member 16 of the optical fiber cable 3 is fixed to the strength member attachment plate 14, the tension applied to the optical fiber cable 3 is applied to the strength member attachment plate 14 via the tension member 16, and The mounting plate 14 is supported by a fitting groove 7 that is provided around the inner wall surfaces of the upper sleeve 4 and the lower sleeve 5 so as to circulate. As described above, the tensions of the left and right optical fiber cables are held by the entire linear connecting member 1 of the optical fiber cable.

Therefore, according to the present embodiment, it is possible to simplify the assembly of the linear connection member and save the work. Further, the connection between the optical fiber core wire 13 of the optical fiber cable 2 and the optical fiber core wire 18 of the optical fiber cable 3 passes through the holes 12 and 19 of the strength member attachment plates 8 and 14 without being subjected to excessive bending. Since the connection is made in the central part, it is possible to prevent an increase in transmission loss due to microbending in the linear connection part.

A resin 22 is enclosed in the space 21 as shown in FIG. The resin 22 can seal the inside of the linear connecting member 1 of the optical fiber cable. The resin is sealed in the space 23 as in the space 21. Therefore, the waterproof / moisture-proof effect can be improved, and the reliability of the connecting portion of the optical fiber cable can be improved.

FIG. 4 shows another embodiment of the strength member attaching plate used for the straight connecting member of the optical fiber cable according to the present invention. In the figure, reference numeral 30 denotes a tensile strength member mounting plate, which is formed in a disk shape, and has a hole 31 formed in the center thereof for penetrating a tension member of the optical fiber cable. Reference numeral 32 denotes a protrusion formed in the center of the tensile strength member mounting plate 30. At this protrusion 32, the tension member of the optical fiber cable protruding through the hole 31 is clamped and fixed. There is. The hole 31 and the protrusion 32 form a strength member attachment portion. A plurality of slits 33 are formed from the outer peripheral end of the disc-shaped strength member mounting plate 30 toward the center. The slit 33 is formed in a width sufficient to insert the optical fiber core wire of the optical fiber cable.

As described above, the present embodiment is different from the embodiment shown in FIG. 1 in that the embodiment shown in FIG. 1 has a hole for passing the optical fiber core wire of the optical fiber cable in the strength plate attachment plate. In contrast to this, in the present embodiment, a slit is formed in the strength member mounting plate for passing the optical fiber core wire of the optical fiber cable.

Therefore, according to this embodiment, it is possible to further simplify the assembling of the linear connecting member and to save the labor for the construction, as compared with the embodiment shown in FIG.

[0025]

[Effect of the device]

 According to the present invention, since it is configured as described above, it is possible to simplify the assembly of the linear connecting member, save labor in the work, and increase the degree of freedom of the processing path of the optical fiber core wire. Unnecessary bending and distortion can be eliminated.

[Brief description of drawings]

FIG. 1 is an assembled perspective view showing an embodiment of a straight connecting material for an optical fiber cable according to the present invention.

2 is an overall perspective view of a strength member mounting plate shown in FIG. 1. FIG.

FIG. 3 is a plan view of the optical fiber cable shown in FIG. 1 with an upper sleeve of a linear connecting member removed.

FIG. 4 is a perspective view showing another embodiment of the strength member attachment plate of the linear connecting member of the optical fiber cable according to the present invention.

FIG. 5 is an assembled perspective view showing a linear connecting member of a conventional optical fiber cable.

FIG. 6 is a plan view of a conventional optical fiber cable in which an upper sleeve of a straight connecting material is removed.

[Explanation of symbols]

1 …………………………………………………… Linear connecting material for optical fiber cable 2, 3 ………………………………………… Optical fiber cable 4 ……… ………………………………………… Upper sleeve 5 ……………………………………………… Lower sleeve 6, 7 ……………………………… ………… Mating groove 8,14,30 ……………………………… Strength member mounting plate 10,17,12,19 ……………… Hole 11,15,32 ………… ………………… Protrusion 13,18 …………………………………… Optical fiber core wire 20 ………………………………………… Optical fiber connection housing 33 ……………………………………………… Slit

Claims (1)

[Scope of utility model registration request] 1. A strength member for forming two fitting grooves on an inner peripheral surface of a case constituted by an upper sleeve and a lower sleeve, and fixing a strength member of an optical fiber cable in each of the two fitting grooves. An optical fiber in which a strength member mounting plate having a plurality of holes penetrating the mounting part and the optical fiber core wire of the optical fiber cable is fitted, and a connection part of the optical fiber core wire is housed between the two strength member mounting plates. A straight connecting material for optical fiber cables with a connection storage part.