JPH0795128B2 - Multi-core optical unit connection box - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a connection box for a multi-core optical unit, and more particularly to an improvement of a connection box of a type in which a plurality of extra-length storage cases for optical fibers are arranged in a box body. It is a thing.

[Prior art]

A multi-core optical unit is a core type that collects multiple optical fiber strands (those without a reinforcement coating) and covers the outer periphery with a common reinforcement coating (FRP, nylon, etc.),
There is a cable type in which a plurality of optical fiber core wires (those having a reinforcing coating) are gathered and the outer circumference thereof is covered with a common sheath.

When connecting a multi-core optical unit containing a plurality of such optical fibers, the optical unit is introduced into a box, and then the optical fibers are separated and then the optical fibers are connected, The extra length is stored in the extra length storage case. The extra length storage cases are prepared in a number corresponding to the number of optical fibers, and are stacked in the box body. That is, the conventional connection box is a method in which the multi-core optical unit introduced into the box is separated into individual optical fibers over the entire length, and all the connection extra lengths are stored in the extra length storage case in the state of optical fibers.

However, in such a connection box, the extra length required for reconnection, etc. must be in the state of the optical fiber, so the stripping length of the reinforcing coating and the sheath and the length of separation into individual optical fibers become long. There was a problem that workability was poor. If the optical fiber near the introduction port of the extra length storage case is damaged when the extra length storage case is taken in or out, the extra length cannot be used, and there is a risk that the optical fiber cannot be reconnected.

[Object of the Invention]

In view of the above problems, it is an object of the present invention to provide a connection box for a multi-fiber optical unit that has good workability in connecting the multi-fiber optical unit and can reliably reconnect an optical fiber. .

[Structure of Invention]

The multi-fiber optical unit connection box of the present invention that achieves the above object,
An extra-length storage case having a large thickness for accommodating the base side of the multi-core optical unit introduced therein as an extra length, and an individual optical fiber obtained by separating the tip side of the multi-core optical unit. The extra length and a plurality of thin extra-thickness storage cases for storing the connecting parts are stacked so that the former extra-length storage case is located in the back of the latter extra-length storage case. It is a feature.

〔Example〕

1 to 3 show an embodiment of a connection box of the present invention, in which 1 is a box body made of metal or resin, and a box body 3
And a single-sided lid 5. Introducing portions 9 of the multi-fiber optical unit 7 are provided on both side walls of the box body 3. A mounting board 11 is fixed to the bottom of the box body 3. On this mounting substrate 11, a thick extra length storage case 13 and a plurality of extra length storage cases 15 having a smaller thickness are stacked and arranged. The thick extra length storage case 13 is located closer to the back (bottom) of the box body 3 than the thin extra length storage case 15.

The thick extra length storage case 13 has a bottom plate 17 as shown in FIG.
Two discs that control the minimum bending diameter of the multi-core optical unit
19, a folding piece 21 for preventing the multi-fiber optical unit from popping out is provided on the periphery, and a projecting piece 23 having two holes is formed at the center of the upper side. The case 13 is thick enough to accommodate the multi-core optical unit.

Further, as shown in FIG. 1, the thin extra length storage case 15 has two discs for controlling the minimum bending diameter of the optical fiber on the bottom plate 25.
27 and an optical fiber connecting portion holder 29, a folding piece 31 for preventing the optical fiber from jumping out is provided on the periphery, and a projecting piece 33 having two holes is formed at the center of the upper side.

Two guide bars 35 are provided upright on the mounting substrate 11 so as to correspond to the holes of the projecting pieces 23 and 33. The tip of the guide bar 35 is bent at a substantially right angle so as to face the upper side of the box body 3.
As shown in FIG. 2, the extra length storage cases 13 and 15 are
The guide rod 35 is inserted into the holes of the projecting pieces 23 and 33 and stored in the box body 3. Engaging pieces 37 are projected on both sides of the extra length storage case 15 on the most front side (upper side). On the other hand, a bracket 39 is erected on the mounting substrate 11 so as to correspond to the locking piece 37. When the locking piece 37 is screwed to the bracket 39, all the extra length storage cases 13 and 15 are fixed in the box body 3.

A pair of supports 41 are erected at the center of the upper side of the mounting substrate 11, and a pair of stands 43 are fixed to the upper ends of the supports 41. A large number of grooves 45 are formed in the stand 43 in a direction perpendicular to the surface of the mounting board 11 and in a direction parallel to the upper side of the mounting board 11. This groove 45 is the protrusion
The pitch of the grooves 45 is the same as or slightly larger than the interval between the protruding pieces 23 and 33 when the extra length storage cases 13 and 15 are stacked.

The multi-core optical unit 7 introduced into the box body 3 is separated into individual optical fibers by removing the sheath or the reinforcing coating from the tip to the middle. The multi-fiber optical unit 7 that remains without being separated is stored in a thick extra length storage case 13. When the multi-fiber optical unit 7 is stored in the thick extra length storage case 13, the sheath or the reinforcing coating may be stored without peeling or may be stored after peeling. The end of the multi-fiber optical unit 7 is pulled out from the extra length storage case 13,
Both sides of 13 are fixed to crumbs 47 installed on the mounting substrate 11.

Each of the separated optical fibers 7A is connected to the other party, and the connecting portion and the extra length portion are stored in a thin extra length storage case 15. Normally, one thin optical fiber storage case accommodates one connected optical fiber.

If it becomes necessary to reconnect or switch the optical fiber in the back during or after the connection work, the thinnest extra length storage case on the front side
Pull out 15 from the guide rod 35 and attach the protruding piece 33 to the stand 43.
Insert the thin extra length storage case 15 into the groove 45 of the
43 Stand up. By repeating such operations, the desired thin extra length storage case is brought to the front and the necessary work is performed. FIG. 3 shows a state in which the thin extra length storage case 15 from the top is set on the stand 43 and the necessary work is performed on the optical fiber stored in the third extra length storage case. There is.

Also, when the excess length as an optical fiber is insufficient due to repeated reconnection, etc., take out the multi-core optical unit stored in the thick excess length storage case 13 and separate it into individual optical fibers. , You can get the extra length you need.

〔The invention's effect〕

As described above, according to the present invention, since a thick extra length storage case capable of accommodating the extra length in the state of the multi-fiber optical unit which is not separated into the optical fiber is provided, the stripping length of the sheath or the reinforcing coating or the optical length There is an advantage that the connection length is short and the connection work is easy. Further, when the excess length of the optical fiber is insufficient, there is an advantage that the required extra length can be obtained by separating the multi-fiber optical unit stored as the excess length into the optical fiber. Furthermore, since the thick extra length storage case for storing the multi-fiber optical unit is installed at the back of the thin extra length storage case for storing the individual optical fibers, there is no obstacle when reconnecting the optical fibers.
There is an advantage that the reconnection work can be easily performed.

[Brief description of drawings]

FIG. 1 is a plan view showing a multi-fiber optical unit connection box according to an embodiment of the present invention with a lid open, and FIG. 2 shows the same connection box with a lid closed. FIG. 3 is a sectional view showing a state in which a part of a thin extra length storage case of the same connection box is erected on a stand, and FIG. 4 is a plan view showing a thick extra length storage case of the same connection box. Is. 1 to box body, 3 to box body, 5 to lid, 7 to multi-core optical unit,
7A ~ optical fiber, 13 ~ thick extra length storage case, 15 ~ thin extra length storage case.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Bibliography Showa 57-136918 (JP, U) Showa 58-133112 (JP, U)

Claims (1)

[Claims] 1. An extra length storage case having a large thickness for accommodating a base side of a multi-fiber optical unit introduced therein as an extra length in a box body, and a tip side of the multi-fiber optical unit are separately obtained. The extra length of each individual optical fiber and multiple thin extra length storage cases that store the connection parts are stacked so that the former extra length storage case is located behind the latter extra length storage case. A multi-fiber optical unit connection box characterized by being arranged as follows.