JP5111432B2 - Light closure - Google Patents

Description

  The present invention relates to an optical closure, and more particularly to an optical closure provided at a connection point between an optical fiber cable and another optical fiber cable connected to the optical fiber cable.

There are many proposals for an aerial optical closure provided at a connection point between an aerial optical fiber cable and an optical drop cable branched from the optical fiber cable (see, for example, Patent Documents 1 and 2).
A conventional optical closure generally has a structure in which a connection portion between an optical fiber of an optical fiber cable and an optical fiber of an optical drop cable is accommodated in a tray accommodated in a closure sleeve together with an extra length.

When a Type 2 communication carrier that does not have line facilities borrows an optical communication line from a Type 1 communication carrier that has line facilities and constructs an access system, the Type 2 communication that is the operator on the withdrawal side The business operator installs an optical closure and draws a line from the optical closure to the user's home using an optical drop cable or the like.
The optical fiber drawn out from the main line side optical fiber cable installed by the first type communication carrier which is the main line side worker is connected to the second type communication carrier side optical fiber in the optical closure.

JP 2007-121773 A JP 2007-298922 A

However, in the conventional optical closure, it has been difficult to cope with changes in the wiring form such as increase / decrease in the number of wirings and necessity of branching after intermediate.
In addition, when connecting the optical fiber cable on the main line side and the optical fiber on the withdrawal side, the point of interface (POI) between the main line side worker and the withdrawal side worker in the optical closure. It is necessary to clarify. For this reason, there has been a demand for an optical closure that can clarify this demarcation point.
It is also an issue to improve work safety by preventing troubles such as communication failure caused by each worker touching wiring not related to work.
The present invention has been made in view of the above circumstances, can cope with a change in wiring form, can clearly define the demarcation point of responsibility between the trunk side worker and the withdrawal side worker, and each worker can work. The purpose is to provide an optical closure that can avoid touching wiring that is not related to the above.

The invention according to claim 1 of the present invention is an optical closure provided at a connection point between a first optical fiber cable and a second optical fiber cable connected to the first optical fiber cable, A case main body part into which one optical fiber cable is drawn, a lid part that is openable and closable with respect to the case main body part, and an intermediate interposer that can be detachably interposed between the case main body part and the lid part And the lid is configured to be able to draw the second optical fiber cable, and the intermediate interposer includes the optical fiber of the first optical fiber cable and the second optical fiber. A connection optical fiber that can be interposed between the optical fiber of the fiber cable and the case main body and the lid are directly connected to each other, and the optical fiber of the first optical fiber cable and the second light Fah The optical fiber of the first optical fiber cable can be directly connected to the optical fiber of the first optical fiber cable when the intermediate body is interposed between the case main body part and the lid part. An optical closure capable of connecting the optical fiber of the second optical fiber cable via the optical fiber for connection is provided.
According to a second aspect of the present invention, in the first aspect, the connecting optical fiber branches the optical fiber of the first optical fiber cable and connects to the optical fiber of the second optical fiber cable. An optical closure that is an optical fiber for branching is provided.
The invention according to claim 3 of the present invention is the method according to claim 1 or 2, wherein the intermediate body is closed with respect to the case body and the lid is opened with respect to the intermediate body. An optical connector for connecting the connecting optical fiber to the optical fiber of the second optical fiber cable without exposing a connecting portion between the connecting optical fiber and the optical fiber of the first optical fiber cable Providing a light closure configured to be exposed.
According to a fourth aspect of the present invention, in any one of the first to third aspects, the intermediate body is opened with respect to the case main body, and the lid is disposed on the intermediate body. When the connecting portion is closed, the connecting portion between the connecting optical fiber and the optical fiber of the first optical fiber cable is exposed, and the connecting optical fiber is connected to the optical fiber of the second optical fiber cable. Provided is an optical closure configured such that an optical connector for connection is not exposed.
The invention according to claim 5 of the present invention is the invention according to any one of claims 1 to 4, wherein the intermediate interposer is interposed between the case body and the lid. A partition wall that divides a space on the case main body side into which the first optical fiber cable is drawn and a space on the lid side into which the second optical fiber cable is drawn, the connection optical fiber and the first optical fiber cable; An optical connector for connecting the optical fiber for connection to the optical fiber of the second optical fiber cable is disposed on the side of the case body of the partition wall. An optical closure disposed on the lid side of the partition wall is provided.
The invention according to claim 6 of the present invention is that, in claim 5, the intermediate interposer includes a base portion having the partition wall, and a case-like connection module provided on the lid portion side of the partition wall. The connection module provides an optical closure including an optical connector for connector-connecting the connection optical fiber to an optical fiber of the second optical fiber cable.
The invention according to claim 7 of the present invention provides the optical closure according to claim 6, wherein the connection module is rotatably connected to the base portion by a hinge portion.

According to the present invention, since the intermediate interposer including the connection optical fiber can be detachably interposed between the case main body portion and the lid portion, according to the required wiring form, the intermediate interposer The form in which the body is interposed and the form in which the intermediate body is not used can be used properly. Therefore, it is possible to cope with a large change in the wiring form such as increase / decrease of the number of wirings or necessity of branching after intermediate.
Also, by interposing an intermediate body between the case main body and the lid, the space on the case main body and the space on the lid can be separated from each other. The demarcation point of responsibility with the worker on the side can be clarified.
Further, since the trunk line side and the withdrawal side are separated by the intermediate interposer, the worker on the trunk line side does not touch the wiring on the withdrawal side, and the worker on the withdrawal side does not touch the wiring on the trunk line side.
Therefore, it is possible to prevent troubles such as communication failure caused by each worker touching wiring not related to work, and improve the safety of wiring work.

It is the whole perspective view which looked at the optical closure concerning the present invention from one side. It is the whole perspective view which looked at the optical closure from the other side. It is a perspective view which shows the state which opened the intermediate body with respect to the case main-body part. It is a front view which shows the state which opened the intermediate body with respect to the case main-body part. It is a perspective view which shows the state which opened the cover part with respect to the intermediate intervention body. It is a perspective view which shows the state which rotated the module for connection. It is the perspective view which looked at the optical closure of the state which connected the cover part directly to the case main-body part from the one surface side. It is the perspective view which looked at the optical closure of the state which connected the cover part directly to the case main-body part from the other surface side. It is a perspective view which shows the state which opened the cover part in the optical closure which connected the cover part directly to the case main-body part. It is an optical wiring diagram which shows the example which used the optical splitter as an optical fiber for connection. It is an optical wiring diagram which shows the example which used the fan-out optical fiber as an optical fiber for connection. It is a schematic diagram which shows an example of the jacket holding | grip type optical connector attached to the front-end | tip of a 2nd optical fiber cable.

Hereinafter, an optical closure embodying the present invention will be described with reference to the drawings.
1 is an overall perspective view of the optical closure 1 according to the present invention as viewed from one side, FIG. 2 is an overall perspective view of the optical closure 1 as viewed from the other side, and FIG. It is a perspective view which shows the state which opened. FIG. 4 is a front view showing a state in which the intermediate interposer 4 is opened with respect to the case body 2. FIG. 5 is a perspective view showing a state in which the lid 3 is opened with respect to the intermediate intervention body 4. FIG. 6 is a perspective view showing a state in which the connection module 44 is rotated.

As shown in FIGS. 1 and 2, the optical closure 1 includes an optical fiber cable 11 (first optical fiber cable) on the trunk line side and an optical drop cable 12 (second optical fiber cable) branched from the optical fiber cable 11. ), A case main body portion 2 into which the optical fiber cable 11 is drawn, a lid portion 3 that can be opened and closed with respect to the case main body portion 2, and the case main body portion 2 and the lid portion 3. And an intermediate interposer 4 that can be detachably inserted.
Hereinafter, a form in which the intermediate interposer 4 is interposed between the case body 2 and the lid 3 is referred to as a first form.

As shown in FIGS. 3 and 4, the case main body 2 has a tray shape in which a side plate 22 is formed on the periphery of a substantially rectangular face plate 21.
A connection holder 23 is formed on the inner surface of the face plate 21. The connection part holder 23 can detachably hold the connection part 14 between the optical fiber 11 a drawn from the optical fiber cable 11 and the connection optical fiber 13.

A cable passage port 20 through which the optical fiber cable 11 is inserted into the case body portion 2 and a cable passage port 24 through which the optical drop cable 12 and the like are inserted are formed at both ends of the case body portion 2.
On the inner surface of the face plate 21, a cable holding portion 25 having a fitting groove 25a into which a covering portion of a cable (such as the optical drop cable 12) passing through the cable passage port 24 is fitted is provided.
As shown in FIG. 3, the cable holding portion 25 forms a substantially triangular waterproof space 28 together with the partition wall 41 a formed on the substrate 41 of the intermediate interposer 4 when the intermediate interposer 4 is closed.

As shown in FIG. 1, the case body 2 and the intermediate body 4 are connected to each other by a hinge 26 so as to be rotatable. The intermediate body 4 can be opened and closed with respect to the case body 2.
The hinge 26 has a shaft portion 26b extending from a protruding wall portion 26a on the outer surface of the side plate 42 of the intermediate interposer 4 and is rotatably fitted to a bearing portion 26d of the support body 26c on the outer surface of the side plate 22 of the case body 2. Configured.
The protruding wall portion 26 a is formed on a side plate 42 provided on one long side of the substrate 41 of the intermediate interposer 4.
The support body 26 c is formed on the side plate 22 provided on one long side of the face plate 21 of the case body 2.

Reference numeral 27 shown in FIGS. 2 and 3 is a lock piece that is slidable between a position that allows the case body 2 to open the intermediate body 4 and a position that restricts the opening.
The lock piece 27 is formed on the outer surface side of the side plate 22 provided on the other long side of the face plate 21, can be engaged with and disengaged from the engagement piece 42 a of the intermediate interposer 4, and is engaged with the engagement piece 42 a. The opening of the intermediate interposer 4 is restricted to allow the opening when it is released.

As shown in FIGS. 5 and 6, the intermediate interposer 4 includes a tray-like base portion 43 in which a side plate 42 is formed on the periphery of a substantially rectangular substrate 41, and a surface on the lid portion 3 side of the base portion 43. And a case-like connection module 44 provided.
The substrate 41 includes an inner space of the optical closure 1, a space (first storage space 51) (see FIG. 3) on the case body 2 side into which the optical fiber cable 11 is drawn, and a lid 3 into which the optical drop cable 12 is drawn. It functions as a partition wall separated from the side space (second storage space 52) (see FIGS. 5 and 6).

The connection module 44 includes a substantially rectangular inner plate 45, side plates 46 and 46 erected on both side edges of the inner plate 45, end plates 47 and 47 erected on both ends of the inner plate 45, This is a case body including an outer plate 48 facing the inner plate 45.
The connection module 44 is provided along a side plate 42 provided on one long side of the substrate 41, and is connected to the side plate 42 by a hinge 49 so as to be rotatable. (See FIG. 5) and a position tilted forward (see FIG. 6).

  A plurality of optical connector adapters 50,... (Optical connectors) are provided on the end plates 47, 47, respectively. The optical connector adapter 50 in the illustrated example can be connected to the optical connector 15 (optical connector plug) at the tip of the optical fiber 12 a drawn from the optical drop cable 12.

As shown in FIGS. 5 and 6, the lid 3 has a tray shape in which a side plate 32 is formed on the periphery of a substantially rectangular face plate 31.
The lid 3 and the intermediate interposer 4 are connected to each other by a hinge 36 so as to be rotatable. The lid 3 can be opened and closed with respect to the intermediate interposer 4.

As shown in FIG. 1, the hinge 36 has a shaft portion 36 b extending from a protruding wall portion 36 a on the outer surface of the side plate 32 of the lid portion 3, and a bearing portion 36 d of the support body 36 c on the outer surface of the side plate 42 of the intermediate body 4. It is configured to be pivotably fitted.
The protruding wall portion 36 a is formed on the side plate 32 provided on one long side of the face plate 31 of the lid portion 3.
The support 26 c is formed on a side plate 42 provided on one long side of the substrate 41 of the intermediate interposer 4.

Reference numeral 37 shown in FIGS. 5 and 6 is a lock piece that is slidable between a position where the intermediate body 4 is allowed to open the lid 3 and a position where the opening is restricted.
The lock piece 37 is formed on the outer surface side of the side plate 42 provided on the other long side of the face plate 41, can be engaged with and disengaged from the engagement piece 32a of the lid portion 3, and is lid when engaged with the engagement piece 32a. The opening of part 3 is restricted, and opening is permitted when released.

The optical fiber for connection 13 is an optical fiber with a connector to which an optical connector 16 (optical connector plug) to be inserted and connected to the optical connector adapter 50 is attached at an end.
The connecting optical fiber 13 is connected to the optical fiber 11a of the optical fiber cable 11 by connecting an end portion (hereinafter referred to as a connecting end portion) opposite to the end portion where the optical connector 16 is provided. The optical fiber 11a is terminated to be connectable to the optical drop cable 12.

As shown in FIG. 4, the connection between the connection optical fiber 13 and the optical fiber 11a of the optical fiber cable 11 is, for example, a fusion connection.
A connecting portion 14 between the connecting optical fiber 13 and the optical fiber 11a is detachably held by a connecting portion holder 23 of the case main body 2.
The connection between the connection optical fiber 13 and the optical fiber 11a is not limited to the fusion connection, and may be a mechanical connection using a mechanical splice or the like. Connector connection can also be employed.

In the state shown in FIGS. 3 and 4, the intermediate interposer 4 is open with respect to the case body 2, and the lid 3 is closed with respect to the intermediate interposer 4.
In this state, the connecting portion on one end side of the connecting optical fiber 13 (the connecting portion 14 with the optical fiber 11a shown in FIG. 4) is exposed, and the connecting portion on the other end side (the light shown in FIGS. 5 and 6). The connector adapter 50) is not exposed.

As shown in FIG. 6, the connecting optical fiber 13 passes through the openings 53 and 54 of the substrate 41 of the intermediate interposer 4 and is introduced into the connecting module 44 through an opening (not shown).
As shown in FIG. 5, the optical connector 16 of the connection optical fiber 13 is connected to the optical connector adapter 50 from the inside of the connection module 44.
When the optical connector 15 is connected to the optical connector adapter 50, the optical fiber 12a of the optical drop cable 12 and the connecting optical fiber 13 are optically connected.

In the state shown in FIGS. 5 and 6, the intermediate interposer 4 is closed with respect to the case body 2, and the lid 3 is open with respect to the intermediate interposer 4.
In this state, the connection portion on one end side of the connection optical fiber 13 (connection portion 14 shown in FIG. 4) is not exposed, and the connection portion on the other end side (optical connector adapter 50 shown in FIGS. 5 and 6). Is exposed.

As the optical fiber cable 11, for example, a self-supporting optical fiber cable in which a support wire portion including a tensile body such as a steel wire and a cable body portion are connected can be used. As the optical fiber cable 11, a small-diameter optical fiber cable having a small number of cores (for example, about 1 to 24 cores) is preferable.
Here, the optical fiber 11a of the optical fiber cable 11 is a multi-core optical fiber ribbon.
The optical drop cable 12 is a small-diameter single-core optical fiber cable in which, for example, an optical fiber strand (or an optical fiber core wire) is embedded in a resin. The second optical fiber cable is not limited to a drop cable, and other general-purpose optical fiber cables can be used.

FIG. 10 shows the base-side optical fiber 13a, the branch coupling part 13b (splitter body) provided in the base-side optical fiber 13a, and the base-side light via the branch coupling part 13b. In this example, an optical splitter including a plurality of branch side optical fibers 13c branched from the fiber 13a is employed.
The proximal end side optical fiber 13a and the branch side optical fiber 13c are single-core optical fibers. The optical connector 16 is attached to the tip of each branch side optical fiber 13c extending from the branch coupling portion 13b.
In this example, the proximal end side optical fiber 13a of the connecting optical fiber 13 is connected to one core of the optical fiber 11a that is a multi-core optical fiber ribbon, and a plurality of optical fibers are connected to one core of the optical fiber cable 11. The optical drop cable 12 is connected via the optical splitter 13.

In FIG. 11, a fan-out optical fiber is used as the connection optical fiber 13. The connecting optical fiber 13 in this example is branched from a multi-core optical fiber portion 13d, which is a multi-core optical fiber ribbon, into a plurality of single-core optical fiber portions 13e. The optical connector 16 is attached to the tip of each single-core optical fiber portion 13e extending from the multi-core optical fiber portion 13d.
In this example, the multi-fiber optical fiber part 13d is connected to the optical fiber 11a, which is a multi-fiber optical fiber ribbon, in the connection part 18, and each multi-fiber optical fiber 11a of the optical fiber cable 11 is connected to each core. The optical drop cables 12 are connected one by one.

FIG. 12 shows an example of the optical connector 15 at the tip of the optical drop cable 12.
The optical connector 15 is an outer-grip optical connector, and includes a housing 62 in which a ferrule 61 is housed, and a retaining portion 63 that retains a fixed block 12b fixed to the outer sheath of the distal end portion of the optical drop cable 12.
The retaining portion 63 is a rotation cover that is pivotally attached to the housing 62. The retaining portion 63 is provided with an engaging portion 63a that engages with the fixed block 12b.
In order to attach the optical connector 15 to the front end of the optical drop cable 12, the optical fiber 12 a led out to the front end of the optical drop cable 12 is inserted into the housing 62 from the rear end side, and is inserted and fixed in advance to the ferrule 61. The fiber 64 (bare optical fiber) is butt-connected by an alignment mechanism (not shown) in the housing 62.
By rotating the retaining portion 63 and engaging the engaging portion 63a with a fixed block 12b fixed in advance to the outer cover of the optical drop cable 12, the optical drop cable 12 is mounted on the housing 62. It keeps so that it may not be pulled out from 62. Thereby, the optical connector 15 is attached to the tip of the optical drop cable 12.

  As the optical connector 16 (optical connector plug) and the optical connector adapter 50 of the connecting optical fiber 13, for example, an SC type optical connector (F04 type optical connector established in JIS C 5973, SC: Single fiber Coupling optical fiber connector). Optical connector plugs and optical connector adapters can be used. In this case, an SC-type optical connector (optical connector plug) is also used as the optical connector 15 at the tip of the optical drop cable 12.

The optical closure 1 can be used when a second type communication carrier having no line facility constructs an access system by borrowing an optical communication line from a first type communication carrier having a line facility.
Hereinafter, an example of a procedure for dropping an optical line will be described.
As shown in FIGS. 3 and 4, the first type communication carrier opens the intermediate interposer 4 with respect to the case main body 2, and the optical fiber cable 11 in the case main body 2 (the first storage space 51). Then, the optical fiber 11 a of the optical fiber cable 11 and the connecting optical fiber 13 are connected, and the connecting portion 14 is accommodated in the case main body 2.

As shown in FIG. 5 and FIG. 6, the type 2 communication carrier closes the intermediate interposer 4 with respect to the case main body 2 and opens the lid 3 with respect to the intermediate interposer 4, The optical connector 16 at the tip of the optical fiber 12a of the drop cable 12 is inserted into the optical connector adapter 50 and connected.
Thereby, the optical fiber 12a of the optical drop cable 12 is optically connected to the optical fiber 11a of the optical fiber cable 11, and the optical line can be pulled down.

The optical closure 1 can also be used in a form in which the lid 3 is directly connected to the case body 2 without using the intermediate interposer 4.
FIG. 7 is a perspective view of the optical closure 1 in a state in which the lid 3 is directly connected to the case main body 2 when viewed from one side. FIG. 8 is a perspective view of the optical closure 1 as viewed from the other side. FIG. 9 is a perspective view showing a state in which the lid 3 is opened.

In the form shown in FIGS. 7 to 9, the optical closure 1 includes a case main body 2 and a lid 3 that can be opened and closed with respect to the case main body 2.
The case main body 2 and the lid 3 are connected to each other by a hinge 56 so as to be rotatable.
As shown in FIG. 7, the hinge 56 has a shaft portion 36 b extending from the protruding wall portion 36 a on the outer surface of the side plate 32 of the lid portion 3, and rotates around the bearing portion 26 d of the support body 26 c on the outer surface of the side plate 22 of the case main body portion 2. It is configured to fit freely.
Hereinafter, a configuration in which the case main body 2 and the lid 3 are directly connected without the intermediate interposer 4 interposed therebetween is referred to as a second configuration.

In order to assemble the optical closure 1 of this form, in the optical closure 1 of the form shown in FIG. 1, the shaft part 36b can be pulled out from the support 36c so that the cover part 3 and the intermediate interposer 4 can be separated and supported. The case 26b is pulled out from the body 26c so that the case body 2 and the intermediate body 4 can be separated.
Thereby, the intermediate interposer 4 can be removed from the case main body 2 and the lid 3.
By inserting the shaft portion 36 b of the lid portion 3 into the bearing portion 26 d of the support body 26 c of the case body portion 2, the lid portion 3 can be connected to the case body portion 2 so as to be freely opened and closed.

  As shown in FIGS. 8 and 9, the lock piece 27 of the case main body 2 can be engaged with and disengaged from the engagement piece 32 b of the lid portion 3, and the lid portion 3 is opened when the engagement portion 32 b is engaged. Is restricted and allowed to open when released.

As shown in FIG. 9, in the optical closure 1 of the second embodiment, the optical fiber cable 11 is drawn into the case body 2 and the optical fiber 11a of the optical fiber cable 11 and the optical fiber 12a of the optical drop cable 12 are fused. Connect by connection.
The connection part 17 between the optical fiber 11a and the optical fiber 12a is detachably held by the connection part holder 23 of the case body part 2.

As shown in FIGS. 3 and 4, the optical closure 1 is connected to the optical fiber cable 11 that is passed through the case body 2 so as to be introduced from one cable passage 20 and led out from the other cable passage 20. It can be used in a suspended state.
In this case, the intermediate interposer 4 or the lid 3 can be opened and closed with respect to the case main body 2 in a suspended state.
Moreover, it can also be suspended and installed on an aerial support line (not shown) via a hanging tool (not shown) attached to the case body 2.

In the optical closure 1, the intermediate interposer 4 can be detachably interposed between the case main body 2 and the lid 3, so that the intermediate interposer 4 is interposed according to the required wiring form. The first form (FIGS. 1 to 6) and the second form (FIGS. 7 to 9) not using the intermediate interposer 4 can be used properly.
For example, when intermediate branching is not required or when the number of wires is small, the optical fiber 11a of the optical fiber cable 11 is directly connected to the optical fiber 12a of the optical drop cable 12 in the second embodiment.
When intermediate post-branch is necessary or the number of wirings is large, in the first embodiment, the optical fiber 11a is connected to the optical fiber 12a via the connecting optical fiber 13 which is an optical splitter (see FIG. 10). Can do.
In this way, it is possible to cope with a large change in the wiring form such as increase / decrease in the number of wirings or necessity of branching after intermediate.

In the optical closure 1, one end of the connecting optical fiber 13 is shown in the state where the intermediate body 4 is closed with respect to the case body 2 and the lid 3 is opened with respect to the intermediate body 4 (FIGS. 5 and 6). The connection portion 14 on the side is on the back side of the board 41 (partition wall) and is not exposed, and the optical connector adapter 50 on the other end side is on the front side of the board 41 and is exposed.
For this reason, when connecting the optical fiber 12a of the optical drop cable 12 to the connecting optical fiber 13, the operator on the withdrawal side (second type communication operator) does not touch the optical fiber 11a on the trunk line side.
In the state where the intermediate interposer 4 is opened and the lid 3 is closed (FIGS. 3 and 4), the connection portion 14 is exposed and the optical connector adapter 50 is not exposed. Therefore, the optical fiber 11a and the connection optical fiber are exposed. In the connection work with 13, the trunk side worker (first type communication carrier) does not touch the optical fiber 12a on the withdrawal side.
For this reason, the demarcation point between the main line side worker and the withdrawal side worker becomes clear.
Further, since the trunk line side and the withdrawal side are separated by the intermediate interposer, the worker on the trunk line side does not touch the wiring on the withdrawal side, and the worker on the withdrawal side does not touch the wiring on the trunk line side.
Therefore, troubles such as communication failures can be prevented in advance. Moreover, the safety of wiring work can be improved.

  DESCRIPTION OF SYMBOLS 1 ... Optical closure, 2 ... Case main-body part, 3 ... Cover part, 4 ... Intermediate interposition body, 11 ... 1st optical fiber cable, 12 ... Optical drop cable ( 2nd optical fiber cable), 11a ... optical fiber, 12a ... optical fiber, 14 ... connection part, 41 ... substrate (partition wall), 43 ... base part, 44 ... Connection module, 49... Hinge, 50... Optical connector adapter (optical connector), 51... First storage space, 52.

Claims (7)

An optical closure provided at a connection point between a first optical fiber cable (11) and a second optical fiber cable (12) connected to the first optical fiber cable,
A case main body portion (2) into which the first optical fiber cable is drawn, a lid portion (3) that can be opened and closed with respect to the case main body portion, and a detachable portion between the case main body portion and the lid portion. An intervening intermediate body (4),
The lid is configured to allow the second optical fiber cable to be retracted;
The intermediate interposer includes a connecting optical fiber (13) that can be interposed between the optical fiber (11a) of the first optical fiber cable and the optical fiber (12a) of the second optical fiber cable. Prepared,
When the case main body and the lid are directly connected, the optical fiber of the first optical fiber cable and the optical fiber of the second optical fiber cable can be directly connected;
When the intermediate body is interposed between the case body and the lid, the connection between the optical fiber of the first optical fiber cable and the optical fiber of the second optical fiber cable is performed. An optical closure (1) characterized in that it can be connected via an optical fiber.   The said connection optical fiber is an optical fiber for a branch which branches the optical fiber of a said 1st optical fiber cable, and connects to the optical fiber of a said 2nd optical fiber cable. Light closure.   When the intermediate body is closed with respect to the case body and the lid is opened with respect to the intermediate body, the connection optical fiber and the optical fiber of the first optical fiber cable; The connecting portion (14) is not exposed, and the optical connector (50) for connecting the connecting optical fiber to the optical fiber of the second optical fiber cable is exposed. The optical closure according to claim 1 or 2.   When the intermediate body is opened with respect to the case body and the lid is closed with respect to the intermediate body, the connection optical fiber and the optical fiber of the first optical fiber cable The optical connector for connecting the connecting optical fiber to the optical fiber of the second optical fiber cable is not exposed. 4. The optical closure according to claim 1. When the intermediate interposer is interposed between the case main body and the lid, the case main body side space (51) into which the first optical fiber cable is drawn and the second light A partition wall (41) that partitions the space (52) on the lid side into which the fiber cable is drawn;
The connection portion between the connection optical fiber and the optical fiber of the first optical fiber cable is disposed on the case body portion side of the partition wall,
5. The optical connector for connecting the connecting optical fiber to the optical fiber of the second optical fiber cable is disposed on the lid side of the partition wall. 5. The optical closure according to claim 1. The intermediate interposer includes a base portion (43) having the partition wall, and a case-shaped connection module (44) provided on the lid portion side of the partition wall,
6. The optical closure according to claim 5, wherein the connection module includes an optical connector for connecting the connection optical fiber to an optical fiber of the second optical fiber cable.   The optical closure according to claim 6, wherein the connection module is rotatably connected to the base portion by a hinge portion (49).

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