JPH063361Y2 - Optical fiber connection - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a connecting portion of an optical fiber cable or the like, and more particularly to a connecting portion having an improved accommodation structure for a loop-shaped extra length portion formed by connecting optical fiber core wires. .

(Technical background of the invention and its problems) Connection between optical fiber cables or connection between an optical fiber cable and a single-core optical cord having a connector for device connection,
Usually, this is done by mechanically and firmly fixing the tension member, and then abutting the end faces of the optical fibers forming the respective cables or the single-core optical cords, and heating and fusing these end faces.

By the way, in this connection work, it should be connected for the reasons such as absorption of expansion and contraction shift between the cable and the fiber core, treatment for reconnection at a later date, and connection work needing to be performed at a position away from the cable connection part. The fiber core wire has a certain amount of extra length. Therefore, conventionally, the extra length portion of the fiber core wire is housed in the connection portion.

However, in the conventional optical fiber cable connection part, the extra length portion is simply wrapped around the spacer or the like covered on the tension member, or each extra length portion is put together in a storage bag and wound around the winding frame or the central portion inside the housing. However, if the connecting portion vibrates due to an external force applied for some reason, the extra length portion may be easily displaced from the winding position or the inserting position and the surface may be scratched. And by simply winding the extra length or putting it in the storage bag at once,
Since it is necessary to identify the fiber core wire to be reconnected at the time of reconnection due to disconnection of the fiber core wire, the reconnection work requires a lot of time and effort.

On the other hand, the so-called terminal connecting portion that connects the optical fiber cable and the device side with a single-core optical cord is conventionally composed of a housing provided with a predetermined number of single-core optical cords. When there are a large number of wires or when connecting multiple optical fiber cables, multiple housings are arranged in parallel to connect each optical fiber core wire to a single-core optical cord, which constitutes the terminal connection part. It had been. However, simply arranging the casings in parallel increases the widthwise dimension of the terminal connecting portion, and thus requires a large installation area.

It is conceivable to stack the housings, but simply stacking the housings would be very troublesome for maintenance work, and reconnecting work in the case where the fiber core wire is broken.

(Object of the Invention) The object of the present invention is that the extra length of the fiber core wire can be accommodated without damage, maintenance and reconnection work can be easily performed, and the number of fiber core wires is large. An object of the present invention is to provide an optical fiber connecting portion having a structure that does not increase in size even when connecting many optical fiber cables or a plurality of optical fiber cables to a single-core optical cord.

(Summary of the Invention) The present invention has a plurality of extra length accommodating bodies in which respective end portions of optical fibers to be connected are opposed to each other and fixed, and a loop-shaped extra length portion formed by connecting fiber cores is accommodated and fixed. Is removably inserted into a guide groove provided at a constant interval in a housing provided with a notch for guiding the optical fiber terminal, and the housing is closed by a lid.

Embodiments of the Invention Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

The optical fiber connection part according to the present invention comprises a housing 1 as shown in FIG. The housing 1 has side walls 2 and 2 facing each other.
A plurality of guide grooves 2a are provided on the inner wall surface of the. These guide grooves 2a are provided at regular intervals and extend in parallel along the width direction of the side wall 2. Also, the side wall 2,
The notch 2b is provided in the upper portion of each guide groove 2a. These notches 2b are provided along the guide groove 2a and are used to guide the respective ends of the optical fiber cable 8 and the single-core optical cord 9 as described later.

An extra length container 3 shown in FIGS. 2A and 2B is provided in the housing 1.
Is stored. The extra length container 3 is made of a rubber material and has a container plate 4. Support plates 5 and 5'are fixed at opposite ends of the housing plate 4 so as to face each other and face each other. Above the support plates 5 and 5 ', a support groove 5a,
5'a is provided, and both ends of the partition plate 12 are engaged in these support grooves 5a, 5'a. A clamp member 6 and a fixing screw 7 are provided near the support plate 5 of the accommodation plate 4, and the end of the optical fiber cable 8 penetrates the support plate 5 and is clamped by the clamp member 6. The tension member 8b extending from the end of the cable 8 is wound around the screw 7 and fixed by the tightening. On the other hand, the storage plate 4
A clamp member 6'and a plurality of fixing screws 7'are provided in the vicinity of the support plate 5 ', and the ends of the six single-core optical cords 9 penetrate through the holes 5'b of the support plate 5'. It is clamped by the clamp members 6 '. A tension member 9b extending from the end of each single-core optical cord 9 is wound around each screw 7'and fixed by the tightening. Core wire support members 10 and 10 and a core wire fixing member 11 are provided in the central portion of the accommodation plate 4 along the width direction.
The core wire support member 10 is provided with a plurality of support grooves 10a,
The core wire fixing member 11 is provided with a plurality of fixing grooves 11a.

Next, each fiber core wire 8 of the six-fiber optical fiber cable 8
The extra length accommodation step of a will be described.

First, the six fiber core wires 8a extending from the end of the optical fiber cable 8 with extra length are connected to the fiber core wires 9a extending from each single-core optical cord 9 with extra length by heat fusion connection, and then a reinforcing member is provided. Put on 13.

Next, each fiber core wire 8a and 9a is wound in a loop shape to form a loop-shaped extra length portion, and each loop-shaped extra length portion is engaged with the support groove 10a of the support member 10, 10 on each accommodation plate 4. In addition, each reinforcing member 13 is attached to the core wire fixing member 1
1 is press-fitted into the fixing groove 11a and fixed by a synthetic resin such as silicone resin or polyurethane resin.

Next, both ends of the accommodation plate 4 of each extra length accommodation body 3 are engaged with the guide grooves 2a, 2a provided in the side walls 2, 2 of the housing 1. Since the side walls 2 and 2 are provided with the cutouts 2b, the end of the optical fiber cable 8 and the end of each single-core optical cord 9 do not come into contact with the side walls 2 and 2. Therefore, the extra length accommodating bodies 3 can be arranged in multiple stages in the housing 1 simply by pushing the accommodating plates 4 into the housing 1.

Finally, as shown in FIG. 2 (B), the partition plate 12 is inserted into the support grooves 5a and 5'a of the support plates 5 and 5'of each extra length container 3 to partition the inside of the housing 1. The lid body 14 is screwed to the housing 1 as shown in FIG. 3 to prevent the extra length accommodation bodies 3 from coming off due to vibration or the like.

In this way, the fiber core wire 8a of the optical fiber cable 8 is
And a plurality of single-core optical cords 9 are connected to the fiber core wires 9a to form a loop-shaped extra length portion, and each optical fiber cable 8
The extra length accommodating body 3 is accommodated in each
When the cable is detachably housed, it is possible to easily identify the cable in which the wire breakage has occurred, and it is possible to easily extract only the extra length container 3 that accommodates the loop extra length portion of the cable from the housing 1. Therefore, the reconnection work can be easily performed in a short time.

Further, since the loop-shaped extra length portion is fixed on the accommodation plate 4 of the extra length accommodation body 3, even if an external force is applied to the housing 1, the positional deviation does not occur, and thus the fiber core wires 8a and 9a are not affected. It is possible to effectively prevent scratches.

Furthermore, when the extra length accommodating bodies 3 are arranged in multiple stages so that they can be inserted into and removed from the housing 1, even if the fiber cores 8a of the plurality of optical fiber cables 8 are connected to the fiber cores 9a of the single-core optical cords 9, they are so large. Since a housing is not required and therefore the terminal connecting portion does not become large, the connecting portion can be installed even in a small space. In addition, since the housing 1 can be arranged in any state, and the extra length container 3 can be inserted into or extracted from the housing 1, the connection portion can be installed in various modes according to the arrangement space.

Then, if a certain number of extra length containers 3 are secured,
Even if the number of optical fiber cables to be connected is increased, the optical fiber cable 8 and the device can be connected by simply attaching the optical fiber cable and the single-core optical cord to the unused extra length housing 3, and thus the use thereof is possible. Even if the form changes, the housing 1 can be used as it is without being replaced.

Also, the end of the optical fiber cable 8 and the single-core optical cord 9
Since the ends of the above are fixed to the accommodation plate 4 by the clamp members 6 and 6 ', the fiber core wires 8a and 9a are not twisted or tensioned, so that the fiber core wires can be prevented from being broken.

In the above-mentioned embodiment, the example of connecting the optical fiber cable 8 and the single-core optical cord 9 has been described, but it goes without saying that it can also be used to connect the fiber cables to each other.

A unit type optical fiber cable may be used as the optical fiber cable 8. In this case, each fiber unit is connected to another fiber unit or a single-core optical cord, and is stored in the extra length container 3. Good.

(Effects of the Invention) According to the present invention, a loop shape is formed by fixing each end of an optical fiber to be connected to each extra length accommodation body and connecting the fiber core of the optical fiber to each extra length accommodation body. Accommodates extra length,
In addition to fixing, each of the extra length housings is supported by a housing provided with a notch for guiding the optical fiber terminal so that it can be inserted and removed in multiple stages through the guide groove, and the housing is closed by the lid. , Even if external force is applied to the optical fiber connection portion, the loop-shaped extra length portion does not cause positional displacement, the extra length container can be prevented from slipping out, and twisting or tension may be applied to the fiber core wire. In addition, since the optical fiber corresponds to each extra length container, the optical fiber that needs to be reconnected can be easily identified and only the optical fiber can be extracted from the housing. In addition, when the extra length accommodating bodies are stored in the housing in a stepwise manner, the housing does not need to be so large even when connecting a multi-core optical fiber or a plurality of optical fibers, and even if the number of optical fibers increases or decreases. You can use your body as it is. Therefore, the connecting work including the re-connecting work can be easily performed in a short time, the fiber core wire is not damaged or broken, and the optical fiber has a small size and versatility. A connection can be provided.

[Brief description of drawings]

FIG. 1 is a perspective view of a housing according to the present invention, FIG. 2 (A),
(B) is a plan view and a perspective view of the extra length container according to the present invention, and FIG. 3 is a perspective view showing a part of the connecting portion according to the present invention in a cutaway manner. 1 ... Case, 2 ... Side wall, 2a ... Guide groove, 2b ... Notch, 3 ... Extra length accommodation body, 8 ... Optical fiber cable, 8a, 9a ... Fiber core wire, 9 ... Single-core optical code.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Akira Yamada 2-1-1, Oda Sakae, Kawasaki-ku, Kawasaki-shi, Kanagawa (Showa Densen Denki Co., Ltd.) (56) Reference JP-A-55-62414 (JP, A) JP-A-59-67510 (JP, A) JP-A-59-13209 (JP, A)

Claims (4)

[Scope of utility model registration request] 1. A plurality of loop-shaped extra length portions formed by connecting a plurality of optical fibers to be connected to each other so as to face each other and connecting a plurality of fiber core wires extending from the respective terminals, A plurality of fixed extra length accommodating bodies, a housing for accommodating the plurality of extra length accommodating bodies at a constant interval, and an inner wall of a side wall of the housing facing each other are provided at a constant interval. A plurality of guide grooves into which both ends of the container are detachably inserted, and a plurality of cutting grooves which are provided in the opposite side walls along the removing / inserting direction of each of the extra length containers to guide each end of the optical fiber. An optical fiber connection part comprising: a notch; and a lid that removably closes the housing to prevent the extra length housings from slipping out. 2. The optical fiber connection section according to claim 1, wherein the optical fibers to be connected to each other are optical fiber cables. 3. The utility model registration claim, wherein one of the optical fibers to be connected to each other is an optical fiber cable and the other is a plurality of single-core optical cords having connectors for connecting devices. The optical fiber splicing part according to the first section. 4. The optical fiber connection section according to claim 1, wherein at least one of the optical fibers to be connected to each other is a unit type optical fiber cable.