JP4840572B2 - Optical module and optical junction box - Google Patents

Description

  The present invention is an optical module that is arranged in an optical connection box and can be connected to an optical connector of a lead-out optical fiber cord, and in particular, can be rotated forward to facilitate the operation when the connector is attached or detached (or inserted or removed). Relates to the optical module.

For example, as shown in FIG. 7 and FIG. 8, a plurality of optical fiber ribbons 2 taken out from the introduction-side optical cable (or external-side optical cable) 1 and a four-fiber optical fiber tape in the illustrated example. The other end of a four-fiber FO (fan-out) cord 3 having an optical connector 3a attached to one end side of each optical fiber 3b of the core wire is fusion-bonded in the fusion-connection tray 4 (a fusion-connection portion is indicated by 5). The optical connector 3a on one end side of each of the FO cords 3 is housed in the optical module 6 'and fitted into the adapter 7 provided on the front surface portion thereof from the inside, while each of the lead-side optical fiber cords 8 is The optical connector 8a attached to the optical fiber is fitted to the adapter 7 of the optical module 6 'from the outside, and the optical connector 3a of the FO cord 3 and the optical connector 8a of the outgoing optical fiber cord 8 are connected by connector. The optical connection box having a structure in which each single-core optical fiber on the introduction-side optical cable 1 side and each single-core optical fiber on the derivation-side optical cable (or device-side optical cable) 9 are switchably connected can be used in various applications. Used as an optical junction box. In this case, the optical modules 6 ′ are stacked as shown.
The derivation side optical cable 9 is a cable formed by collecting the derivation side optical fiber cords 8 together. Reference numeral 11 ′ denotes a case (module case) of the optical module 6 ′. Reference numeral 12 denotes a box of the optical connection box 10 '. 12a is a top plate of the box body 12, and 12b is a cradle for receiving the laminated optical module 6 '.
Here, the optical junction box means that each optical fiber of the introduction side optical cable and each optical fiber of the outgoing side optical cable are attached to the outgoing side optical fiber regardless of the name of the optical termination box, the optical termination box, etc. This is an optical connection box in a broad sense that has a structure in which optical wiring can be switched by attaching and detaching this connector.

In the optical connection box 10 ′, it may be necessary to switch the connection of the optical connector 8a (switch the optical wiring) by inserting and removing the optical connector 8a of the lead-out optical fiber cord 8 (insertion / removal). In order to facilitate such connector insertion / removal operation, as shown by a two-dot chain line in FIG. 8, the pivot shaft 13 through which the optical module 6 ′ is passed through the shaft hole 11a ′ provided at one corner of the module case 11 ′ is provided. Making it rotatable as a center is performed (patent document 1, patent document 2, patent document 3, etc.).
In this type of conventional optical junction box 10 ′, the outlet 21 ′ of the FO cord 3 taken out from the module case 11 ′ is at the center in the width direction on the rear surface of the module case 11 ′, as shown in FIG. The FO cord 3 is fixed at the outlet 21 '. The fixed portion of the FO code 3 is indicated by 22 ′.
FIG. 1 (a) of JP-A-2001-194536, etc. Japanese Patent Application Laid-Open No. 2001-042133, FIG. Japanese Patent Laid-Open No. 10-115716, FIG. 4, FIG. 5, etc.

  When the optical module 6 'is rotated forward to insert / remove the optical connector when switching the optical wiring, the FO cord 3 is bent as shown in FIG. 8, but as in the conventional optical module 6' described above. In the structure in which the outlet 21 ′ of the FO cord 3 is located at the center in the width direction of the rear surface of the module case 11 ′ and is fixed at that position, it is necessary to lengthen the extra length in order to secure a certain bending R of the FO cord 3 There is. For this reason, the degree of freedom of the wiring route in the optical wiring becomes low, the optical wiring switching work itself becomes complicated, and further, it becomes a restriction in downsizing the optical connection box.

  The present invention has been made to eliminate the above-mentioned conventional drawbacks, and it is not necessary to lengthen the extra length when securing the bending R of the optical fiber cord taken out from the rear side of the optical module above a certain level. An optical module that has a high degree of freedom of wiring route in the network, facilitates optical wiring switching work itself, and can reduce restrictions for reducing the size of the optical connection box, and optical connection using the same The purpose is to provide a box.

The invention of claim 1 that solves the above-mentioned problem is a multi-core light comprising a plurality of adapter portions connectable to an optical connector on the front surface portion of a substantially rectangular parallelepiped module case, and a plurality of single-fiber optical connectors attached to the front end side. An optical module disposed in an optical connection box, in which a fiber cord is inserted from the rear side of the module case and an optical connector at the tip is fitted to the adapter part from the inside,
The module case has shaft holes at both corners opposite to the front surface where the adapter is located, and one of the two shaft holes is pivotally supported on a pivot on the box side of the optical junction box. And has a cord outlet opening substantially perpendicular to the cover surface of the module case and opened to the rear surface side as viewed from above, and a multi-core light in the module case near the cord outlet. A fixing portion for fixing a fiber cord; and a cord guide having a guide wall curved on both sides in a form in which the vicinity of the cord outlet is narrow and wide toward the rear surface is formed, and the cord guide is , also serves as a part of the cover of the module case together with the provided below the lid surface between the two sides of the guide wall has the function of placing the multi-fiber optical fiber cord as part of the code guide It is characterized in.

According to a second aspect of the present invention, in the optical module of the first aspect, the guide wall surfaces on both sides of the code guide are symmetrical with respect to the center line in the width direction of the module case as viewed from the upper surface of the module case .

The optical connection box of the invention of claim 3 is an optical connection box using the optical module of claim 1 or 2,
And a plurality of other ends of the multi-core optical fiber cord fitted with a plurality of single-core optical connector to an optical fiber ribbon and one end side taken out from the introduction side optical cable comprising a fusion splicing tray for fusion splicing, the An optical connector on one end side of the multi-fiber optical fiber cord is housed in the module case of the optical module and fitted into an adapter provided on the front surface of the module case from the inside, and the optical connector of the outgoing optical fiber cord is connected to the optical module. The multi-core optical fiber cord and the lead-out optical fiber cord are connected to each other by a connector.

According to the optical module or the optical junction box of the present invention, the cord outlet of the optical module is substantially in the vicinity of the center when viewed from the upper surface of the optical module, and the cord guide is formed from the cord outlet to the rear surface of the case. This cord guide has a guide wall on both sides that is curved in such a manner that the vicinity of the cord outlet is narrow and wide toward the rear surface. Therefore, the optical module is rotated to the front for insertion and removal of the optical connector. The bending R of the optical fiber cord that sometimes occurs is always secured to a certain level or more.
Therefore, there is less risk of forcibly bending the optical fiber cord extending from the module case during wiring extraction work, optical connector connection switching work, optical module reassembly work in the optical connection box, etc. Each work becomes easier.
Further, since it is not necessary to take into consideration that the bending R of the optical fiber cord becomes small and it is not necessary to increase the extra length of the optical fiber cord, the degree of freedom of the wiring route in the optical junction box is increased, and In addition, it is possible to increase the wiring density in the optical junction box or to reduce the size of the optical junction box.

  Hereinafter, an optical module and an optical junction box embodying the present invention will be described with reference to the drawings.

  FIG. 1 is a front view of an optical connection box 10 according to an embodiment of the present invention with a door opened, and FIG. 2 is a schematic view of the optical connection box 10 of FIG. It is a top view of a part. A box of the optical junction box 10 is indicated by 12.

As shown in the enlarged view of FIG. 3, the optical connection box 10 has four adapters 7 on the front surface of a substantially rectangular parallelepiped module case 14 in the illustrated example in which the optical connector can be connected. In the illustrated example arranged in a stacked manner, three stages of optical modules 6 are provided.
The optical connection box 10 has an optical connector 3a on one end side of each of the optical fibers 3b of the plurality of optical fiber ribbons 2 taken out from the introduction side optical cable (or the outside optical fiber) 1 and the 4-fiber optical fiber ribbon. The other end of the attached four FO (fan-out) cords 3 is fusion-bonded in the fusion-connection tray 4 (a fusion-connection portion is indicated by 5), and the optical connector 3a on one end side of each FO cord 3 is connected. Is housed in the optical module 6 and fitted into the adapter 7 on the front surface portion thereof from the inside, while the optical connector 8a of the outgoing optical fiber cord 8 is fitted into the adapter 7 of the optical module 6 from the outside to The optical connector 3a of the cord 3 and the optical connector 8a of the outgoing side optical fiber cord 8 are connected to each other, whereby each single-core optical fiber on the inlet side optical cable 1 side and outgoing side optical cable (not provided) And each of the single core optical fiber of the device-side optical cable) 9 side is a structure in which switchably connected. The adapter 7 in the illustrated example of the optical module 6 is a one-side portion of the two-core adapter.
The derivation side optical cable 9 is a cable formed by collecting the derivation side optical fiber cords 8 together. Reference numeral 11 denotes a case (module case) of the optical module 6. Reference numeral 12b denotes a cradle for receiving the laminated optical module 6.
Although the illustrated optical junction box 10 is shown as a small one, it is not limited to a scale, such as an optical termination box installed in an MDF (main distribution board) room of a station building or a large-scale apartment. It is also used for large ones. That is, here, the optical junction box means that each optical fiber of the introduction side optical cable and each optical fiber of the outgoing side optical cable are attached to the outgoing side optical fiber regardless of the name of the optical termination frame, the optical termination box, etc. This is an optical connection box in a broad sense that has a structure in which optical wiring can be switched by attaching and detaching this connector.

As shown in FIGS. 2 and 3, the module case 11 of each optical module 6 has a cord outlet 21 that opens to the rear surface side perpendicular to the cover surface of the module case 11 in the vicinity of the center as viewed from above. A cord guide 23 is formed from the cord outlet 21 to the rear surface of the case. That is, this cord guide 23 has a structure having guide wall surfaces 23a on both sides that are curved in such a manner that the vicinity of the cord outlet 21 is narrow and widens toward the rear surface. Wall surfaces 23a on both sides in the width direction of the illustrated code guide 23 are symmetrical with respect to the center line in the width direction of the module case 11 when viewed from the upper surface of the case. The FO cord 3 guided from the cord outlet 21 into the module case 11 is fixed by a cord fixing portion 22 provided in the vicinity of the cord outlet 21, and each separated optical fiber core wire 3b is pulled inside the module case. The tip optical connector 3a is inserted into the adapter 7 from the inside. Reference numeral 14 denotes a lid of the module case 11. 23 b is also a lid of the module case 11, but is provided lower than the surface of the lid 14 to form a part of the code guide 23.

The module case 11 of each optical module 6 has shaft holes 11a and 11b at both corners opposite to the front surface where the adapter 7 is located, and either one of the two shaft holes 11a and 11b ( In the illustrated example, the shaft hole 11a) is pivotally supported by a pivot 13A on the box body 12 side of the optical connection box 10.
In FIG. 3, reference numerals 17 are locking pieces 17 for locking the optical module 6 in the storage position, and are provided on both sides of the front surface portion of the module case 11 where the adapter 7 is provided. Although not described in detail, the locking pieces 17 on both sides have a semicylindrical concave surface 17a that can be fitted to a circular shaft, and either one of the locking pieces 17 corresponds to the storage position of the optical module 6 and is a box. The optical module 6 can be locked by being fitted to a locking circular shaft provided on the 12 side.

In the optical connection box 10 described above, it may be necessary to switch the connection of the optical connector 8a (switch the optical wiring) by inserting / extracting the optical connector 8a of the lead-out side optical fiber cord 8 (insertion / removal).
When performing such connector insertion / extraction work, as shown by a two-dot chain line in FIG. 2, the optical module 6 is rotated around a vertical pivot 13 </ b> A passing through one shaft hole 11 a of the module case 11, and the adapter 7 The front part with the light exits to the outside from the open surface of the optical connection box 10, and in this state, the optical connectors 8a of the optical connector 8 on the lead-out side are inserted and removed to switch the connection of the optical connector 8a.
When the optical connector connection switching operation is completed, when the optical module 6 is applied with a force that can unlock the optical module 6 and rotated reversely to return to the original state, the locking piece 17 becomes the locking circular shaft on the box 12 side. And stably held in the storage position. By repeating the above procedure, necessary optical connector connection switching of the optical module 6 is performed.

In the above optical wiring switching work (optical connector connection switching work), when the optical module 6 is rotated forward for insertion / extraction of the optical connector, it extends backward from the module case 11 as shown in FIGS. In the optical module 6 described above, the FO cord 3 is gently curved along the curved guide wall surface 23a and extends rearward. Therefore, the bending R of the FO cord 3 is always It is secured above a certain level.
Therefore, there is less risk of forcibly bending the FO cord 3 extending from the module case 11 during wiring extraction work, optical connector connection switching work, optical module reassembly work in the optical connection box, and the like. Each of the above operations becomes easy.
In addition, since it is not particularly necessary to consider that the bending R of the FO cord 3 becomes small and it is not necessary to increase the extra length of the FO cord 3, the degree of freedom of the wiring route in the optical connection box 10 is increased. In addition, the wiring density in the optical connection box 10 can be increased, or the optical connection box 10 can be downsized.

Since the optical module 6 has the shaft hole 11b on the opposite side to the shaft hole 11a, the arrangement as shown in FIG. 6 can be used. That is, in this example, the optical module 6 is installed with its left and right directions opposite to each other, and the pivot 13B attached to the opposite side of the pivot 13A in FIG. 2 is placed in the opposite shaft hole 11b of the optical module 6. This is the case.
In this case, in the optical junction box 10, the FO cord 3 on the introduction side is on the left side, and the optical fiber cord 8 on the derivation side is on the right side.

It is the front view shown in the state which opened the door of the optical junction box of one Example of this invention. It is a top view of the principal part shown in the state except the top plate of the optical junction box of FIG. FIG. 3 shows only the optical module in FIGS. 1 and 2, (A) is a plan view, and (B) is a cross-sectional view taken along line AA of (A). It is the perspective view shown in the state which rotated only the optical module in said optical junction box. FIG. 5 is a perspective view of the optical module shown in FIG. 4 in a state in which the FO cord is brought close to the rotating shaft side of the module case. The other use state of said optical module is shown, It is a top view of the principal part of the optical connection box at the time of providing the pivot of an optical module in the other side of a module case width direction. It is the front view shown in the state which opened the door of the conventional optical connection box. It is a top view of the principal part shown in the state except the top plate of the optical junction box of FIG. It is the perspective view which showed only the optical module in FIG. 7 in the rotated state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Introduction side optical cable 2 Optical fiber tape core 3 FO (fan out) cord (optical fiber cord)
3a Optical connector 3b (at the tip of the FO cord 3) Optical fiber 4 (of the FO cord 3) Fusion splicing tray 5 Fusion splicing portion 6 Optical module 7 Adapter 8 Deriving side optical fiber cord 8a (Deriving side optical fiber cord 8 Attached) optical connector 9 lead-out side optical cable 10 optical connection box 11 module case 11a, 11b (through the pivot) shaft hole 12 box 12b base 13A, 13B pivot 14 (module case) lid 21 cord outlet 22 cord fixing Part 23 Code guide 23a Wall surface

Claims (3)

A multi-core optical fiber cord having a plurality of adapter parts connectable to an optical connector at the front part of a generally rectangular parallelepiped module case and a plurality of single-core optical connectors attached to the tip side is inserted from the rear side of the module case. An optical module arranged in an optical connection box, with the optical connector at the tip fitted into the adapter part from the inside,
The module case has shaft holes at both corners opposite to the front surface where the adapter is located, and one of the two shaft holes is pivotally supported on a pivot on the box side of the optical junction box. And has a cord outlet opening substantially perpendicular to the cover surface of the module case and opened to the rear surface side as viewed from above, and a multi-core light in the module case near the cord outlet. A fixing portion for fixing a fiber cord; and a cord guide having a guide wall curved on both sides in a form in which the vicinity of the cord outlet is narrow and wide toward the rear surface is formed, and the cord guide is , also serves as a part of the cover of the module case together with the provided below the lid surface between the two sides of the guide wall has the function of placing the multi-fiber optical fiber cord as part of the code guide Optical module, characterized in that.   2. The optical module according to claim 1, wherein guide wall surfaces on both sides of the cord guide have a symmetrical shape with respect to a center line in the width direction of the module case as viewed from the upper surface of the module case. An optical junction box using the optical module according to claim 1 or 2,
A fusion splicing tray for fusion splicing a plurality of optical fiber ribbons taken out from the introduction-side optical cable and the other end of the multi-fiber optical fiber cord having a plurality of single-core optical connectors attached to one end;
The optical connector on one end side of the multi-core optical fiber cord is housed in the module case of the optical module and fitted into the adapter provided on the front surface of the module case from the inside, and the optical connector of the outgoing side optical fiber cord is optically connected. An optical connection box, wherein the multi-fiber optical fiber cord and the outgoing-side optical fiber cord are connected to each other by fitting into a module adapter from the outside.

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