JPS6170514A - Optical fiber cable connection part - Google Patents

Abstract

PURPOSE:To reduce the diameter of a connection part and to connect optical fiber cables efficiently by attaching a multicore connector to fiber cores of the optical fiber cable. CONSTITUTION:Optical fiber cores 4 having a required length are exposed from the end part of the cable sheath 3 of an optical fiber cable 1 and are arranged in a row, and a multicore connector 8 is attached to front ends of them collectively. This connector 8 consists of a positioning grip body 9 and a mold part 11 which molds collectively optical fibers 10 projected by a prescribed length from the front end of the grip body 9 and is provided with an alignment hole 12, and the mold part 11 is polished together with fibers 10 as one body so that the end face of the mold part 11 are at right angles with fibers 10. Connectors 8 which cannot be moved backward in internal housings 17 and face each other are positioned by fitting pins 22 to holes 12 and are coupled to each other through external housings 13, adapters 21, nuts 24, etc.; and thus, it is unnecessary to connect optical fibers one by one, and the optical fiber connection part is made small-sized, and optical fibers are connected efficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an optical fiber cable connection section.

[Prior art 1] As shown in FIG. 4, the connecting portion 2 of the conventional optical fiber cable 1 is connected to several optical fiber cores FT+4 by removing the excess length 4A of each optical fiber core FT+4 exposed by peeling off the cable sheath 3, as shown in FIG. They are connected to each other at section 5, and there is a tension between the cables 1.
were connected to each other by a connecting member 6, and these were entirely covered by a junction box 7.

[Problems to be solved by the invention] However, such optical fiber cable connection section 2
In this case, since the optical fiber cores 4 are spliced by the fusion splicing part 5, it is necessary to leave an extra length 4A in advance, which has the disadvantage that the diameter of the splicing part 2 becomes large. Also, optical fiber heart I! II4 had the disadvantage of low efficiency because it connected each wire one by one.

SUMMARY OF THE INVENTION An object of the present invention is to provide an optical fiber cable connecting portion that can reduce the diameter of the connecting portion and can connect efficiently.

[Means for Solving the Problems] The optical fiber cable connecting section according to the present invention has a cable sheath of both optical fiber cables to be connected.
A plurality of optical fiber cores are each exposed from the end of the optical fiber cable, and a multi-fiber connector is attached to each of the exposed optical fiber cores at once, and a plurality of optical fiber cores are respectively attached to the exposed optical fiber cores from the cable sheath of each of the optical fiber cables. A cylindrical external housing is attached to the outer periphery of each of the optical fiber cores and the multi-core connector at the tip thereof, and each of the external housings is fixed to the cable sheath on each side. , t, f', ! inside the tip side of each of the external housings. ! The multi-core connectors on each side are housed in each of the inner housings in a non-invasive manner with their connecting end surfaces exposed outward, and each of the inner housings is housed in a manner that allows each of the outer housings to Each of the outer housings is biased to protrude outwardly by a spring housed in the housing, and each of the outer housings is fitted face-to-face from both sides in a common adapter, and both of the multi-core connectors are connected to each other in the adapter. are butt-connected with their respective optical fibers facing each other, and each of the external housings is connected to the adapter with a respective one-way pin.

[Operation of the invention] In such an optical fiber cable connection section, a multi-core connector is attached to each optical fiber core of the optical fiber cable, so such work can be done in advance at the factory. Therefore, there is no need to provide extra length for each optical fiber, and the diameter of the optical fiber cable connection can be significantly reduced.Furthermore, the multi-fiber connector allows each optical fiber to be connected efficiently. Can be connected all at once.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to FIGS. 1 to 3. As shown in the figure, in the optical fiber cable connection section 2 of this embodiment, a plurality of optical fiber cores 4 are exposed over a required length from the ends of the cable sheaths 3 of both optical fiber cables 1 to be connected. . These exposed optical fiber core wires 4 are arranged in a row horizontally, and multi-core connectors 8 are respectively attached to their ends.

This multi-fiber connector 8 includes a positioning grip 9 that grips the optical fiber cores 4 by arranging them horizontally in a row at a predetermined pitch, and a positioning grip 9 that grips the optical fiber cores 4 by arranging them in a horizontal line at a predetermined pitch, and a positioning grip 9 that is made by peeling off the coating from the tip of the positioning grip 9 and protruding at a predetermined pitch. A mold section 11 in which all the optical fibers 10 are molded together except for their distal ends, and a row of optical fibers 10 aligned with the distal ends of the mold section 11 with their end surfaces exposed are located on both sides of the mold section 11. and an alignment hole 12 provided in the mold part 11 in a direction parallel to each optical fiber. The tip of the molded part 11, that is, the connection end surface 8A of the multi-fiber connector 8 has nine fibers 10 each.
It is polished smooth, including the tip.

A cylindrical external housing 13 is attached to the outer periphery of each optical fiber core m4 exposed from the cable sheath 3 of each optical fiber cable 1 and the multi-fiber connector 8 at the tip thereof, to accommodate them. Each external housing 13
are fitted into the cable sheath 3 on each side, and are fixed to the cable sheath 3 on each side with a fixing tree 1115 injected into the outer housing 13 from the hole 14A at a position close to the cable sheath 3. The hole 14A is then closed with a screw 14B. Inside the fixing resin 15 is a tension member 16 inside the optical fiber cable 1.
are also protruded and fixed together.

An inner housing 17 is slidably housed inside the tip side of each outer housing 13. Inside each internal housing 17, the multi-core connector 8 on each side is housed in a stepped portion 18A of the connector receiving recess 18 so as not to be retractable, with its connection end surface 8A exposed outward. Each inner housing 17 is urged to protrude outward by a spring 19 housed within each outer housing 13. The spring 19 is attached to the stepped portion 2OA of the internal housing accommodation recess 20 and the stepped portion 1 of the internal housing 17.
Both ends are brought into contact with 7A and biased. In order to limit the protrusion length of the inner housing 17, a stopper screw (not shown) is screwed into the outer housing 13.
It is engaged with a long groove along the longitudinal direction of the outer periphery of the internal housing 17, and is prevented from being removed by coming into contact with the longitudinal end surface of the long groove.

The tips of both external housings 13 are connected to a common 7-blade 2.
1 from both sides facing each other, and within the adapter 21, both multi-fiber connectors 8 have their optical fibers 0 facing each other and their connecting end surfaces 8A butt against each other to make a butt connection. It has become. In order to properly align the optical fibers 0 with each other, alignment pins 22 are inserted into the alignment holes 12 of both mold parts 11 so that the alignment U is 418. Alignment pins 23 are inserted into alignment holes (not shown) in both internal housings 176 for alignment. The outer housings 13 are connected to adapters 21 by nuts 24, respectively.

An O-ring 25 is fitted and supported on the outer periphery of the external housing 13 that is fitted into the adapter 21 . Further, a heat shrink tube 26 is shrink-fitted across the end of the external housing 13 and the cable sheath 3.

[Effects of the Invention] As explained above, in the optical fiber cable connection section according to the present invention, a multi-fiber connector is attached to each optical fiber core of the optical fiber cable, so the installation work of such a multi-fiber connector is easy. This can be done in advance at the factory, thus eliminating the need to provide extra length for each optical fiber core.
The diameter of the optical fiber cable connection portion can be significantly reduced.

Moreover, according to the multi-fiber connector, each optical fiber core wire can be efficiently connected all at once. Furthermore, such an optical fiber cable connection part has a relatively simple structure and has a small number of parts, so it can be manufactured at low cost. Also, in this connection, both sides to be connected are the same 4? l5T
i, which is suitable because it allows the number of types of parts to be reduced.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a vertical cross-sectional view of an embodiment of the optical fiber cable connection part according to the present invention before connection, and Fig. 2 shows a multi-core connector used in this embodiment. FIG. 3 is a side view of the completed state of the connecting portion, and FIG. 4 is a vertical sectional view C of a conventional optical fiber cable connecting portion. 1... Optical fiber cable, 2... Connection part, 3...
・Cable sheath, 4... Optical fiber core, 8...
Multi-core connector, 8A... Connection end surface, 10... Optical fiber, 13... External housing, 15... Fixing resin, 17... Internal housing, 19... Spring, 21... Adano 1↑ Figure 4

Claims (1)

[Claims] A plurality of optical fiber cores are exposed from the ends of the cable sheaths of both optical fiber cables to be connected, and
A multi-core connector is attached to each of the exposed optical fibers at once, and a multi-core connector is attached to each of the optical fibers exposed from the cable sheath of each optical fiber cable and the multi-core connector at the tip thereof. A cylindrical external housing is attached to the outer periphery to accommodate this.
Each of the outer housings is fixed to the cable sheath on each side, and an inner housing is slidably housed inside the distal end of each of the outer housings, and the plurality of cable sheaths on each side are housed in each of the inner housings. A core connector is housed in a non-retractable manner with its connection end surface exposed outward, and each of the inner housings is urged to protrude outward by a spring housed in each of the outer housings, and each of the outer housings The housings are respectively fitted face-to-face from both sides in a common adapter, and within the adapter both the multi-fiber connectors are butt-connected with their respective optical fibers facing each other, and each of the outer housings is fitted to the adapter. An optical fiber cable connection section characterized in that each part is connected with a nut.