JP5425874B2 - Closure for optical fiber connection - Google Patents

Description

  The present invention relates to an optical fiber connection closure for connecting, for example, a station side optical cable and a subscriber side optical cable.

  As a conventional optical fiber connection closure, for example, the one described in Patent Document 1 is known. The optical fiber connection closure described in Patent Document 1 is disposed in a stacked state, and is disposed in a plurality of termination trays that store the connection portions of the optical fiber and the extra length of the optical fiber, and the lower portion of the termination tray. A splitter tray that stores the splitter module; and a center tray that is disposed at an upper portion of the termination tray and stores the main fiber of the optical cable.

JP 2007-121603 A

  However, the following problems exist in the prior art. That is, since the center tray is arranged above the plurality of termination trays (core connection trays) in the stacked state, the center tray becomes an obstacle when performing the optical fiber connection work in the core connection tray. . Therefore, in order to secure a working space for the core wire connection tray, it is necessary to once pull out the plurality of core wire connection trays. In this case, since a mechanism for moving the core wire connection tray back and forth is required, the overall structure of the closure is complicated, leading to an increase in cost. Further, when the optical fiber connecting tray is moved back and forth, the optical fiber is pulled or suddenly bent, which may affect the transmission characteristics of the optical fiber.

  An object of the present invention is to provide an optical fiber connection closure capable of ensuring a working space for a core wire connection tray with a simple structure.

The present invention provides an optical fiber connection closure for connecting a first optical fiber core wire built in a first optical cable and a second optical fiber core wire built in a second optical cable. A first optical fiber disposed on the upper side of the core connection tray and exposed by removing an outer cover of an intermediate portion of the first optical cable; and a core wire passing tray for accommodating the core wire, the core wire passes tray is provided rotatably so as to be inclined upwardly relative to the core wire connecting the tray to the lower portion of the core wire passing tray A lower extension tray is provided for accommodating a reconnection portion between the first optical fiber cores cut when connecting the first optical fiber core and the second optical fiber core, and the lower extension tray is provided. The tray is opposite to the core passing tray. And it is characterized in that mounted for opening and closing Te.

  In such an optical fiber connection closure according to the present invention, the first optical fiber core wire exposed by removing the jacket of the intermediate portion of the first optical cable is cut, and the first optical fiber core wire and the second optical fiber core wire are cut. The second optical fiber core of the optical cable is connected. And the connection part of a 1st optical fiber core wire and a 2nd optical fiber core wire is accommodated in a core wire connection tray, and the 1st optical fiber core wire which is not cut | disconnected is accommodated in a core wire passage tray. Here, in a state where the core wire passing tray is tilted upward with respect to the core wire connection tray, a work space is formed above the core wire connection tray. Accordingly, when the first optical fiber core wire and the second optical fiber core wire are connected and the connecting portion is accommodated in the core wire connection tray, the core wire passing tray is connected to the core wire connection tray. Just tilt it up. For this reason, it is not necessary to provide a mechanism for pulling the core wire connection tray forward. Thereby, the working space for the core wire connection tray can be secured with a simple structure.

Further, when the connection between the first optical fiber core wire and the second optical fiber core wire becomes unnecessary, the connection between both is removed and the first optical fiber core wire and the second optical fiber core wire are connected. The first optical fiber core wires that are sometimes cut are reconnected to each other, and the reconnected portion is accommodated in the lower extending tray. By attaching such a lower extension tray to the core wire passing tray so as to be openable and closable, the first optical fiber cores can be connected to each other without taking up a large space in the closure or complicating the wiring of the first optical fiber cores. It is possible to cope with the reconnection (lower extension) processing.

  Preferably, the surplus length accommodating portion is disposed on the side of the core wire connecting tray and accommodates the surplus length of the first optical fiber core wire existing between the core wire passing tray and the core wire connecting tray. The surplus length accommodating portion includes a base plate and a pressing plate that is provided on the base plate so as to be freely opened and closed and presses the first optical fiber core wire against the base plate. By providing such a surplus length accommodating portion, it is possible to protect the first optical fiber core wire existing between the core wire passing tray and the core wire connection tray while processing the surplus length.

  In this case, preferably, the base plate is provided on both the left and right sides of the core wire connection tray, and the pressing plate is detachably attached to the base plate. For the purpose of the optical fiber connection closure, it is sufficient that the extra length accommodating portion is provided only on the upstream side of the closure. Therefore, when the left side of the closure is the upstream side, the holding plate is attached to the left base plate, and when the right side of the closure is the upstream side, the holding plate is attached to the right base plate. Thus, by replacing the pressing plate according to the position on the upstream side of the closure, it is not necessary to provide the pressing plate on both the left and right sides of the core wire connection tray.

  According to the present invention, a working space for the core wire connection tray can be secured with a simple structure. This eliminates the need for a mechanism for pulling the core wire connection tray forward, so that the optical fiber core wire is restrained from being pulled or suddenly bent, which may affect the transmission characteristics of the optical fiber core wire. In addition to being prevented, the cost can be reduced.

1 is a perspective view showing an embodiment of an optical fiber connection closure according to the present invention. It is a perspective view which shows the part except the main tray in the closure for optical fiber connection shown in FIG. It is a perspective view of the core wire connection tray group shown in FIG. It is a top view which shows the wiring form of the optical fiber core wire in the core wire connection tray shown in FIG. It is a perspective view of the core wire passage tray shown in FIG. It is a perspective view which shows the state which the core wire passage tray incline upwards in the closure for optical fiber connection shown in FIG. It is a perspective view which shows the state which the lower extension tray opened with respect to the core wire passage tray in the optical fiber connection closure shown in FIG. It is a perspective view which shows the lower extension tray shown in FIG. 7 with the core wire passage tray. It is a perspective view which shows the open / close state of the extra length accommodation pocket shown in FIG. FIG. 2 is a perspective view showing a state where main trays are fixed to a frame body by a tray pressing plate in the optical fiber connection closure shown in FIG. 1.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of an optical fiber connection closure according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view showing an embodiment of an optical fiber connection closure according to the present invention. In the figure, an optical fiber connection closure (hereinafter simply referred to as a closure) 1 according to the present embodiment is built in an optical fiber core wire 3 built in a main trunk cable 2 on a station side and a branch cable 4 on a subscriber side in the space. This is a device for connecting the optical fiber core 5 and is used in a PDS (Passive Double Star) line system.

  The closure 1 includes a frame body 6 fixed to a housing (not shown) into which the main trunk main cable 2 and the branch cable 4 are introduced. As shown in FIG. 2, a tray fixing base plate 7 is attached to the center of the frame body 6. In addition, a tray fixing base plate 8 is attached to each of the left and right sides of the tray fixing base plate 7 in the frame body 6.

  A plurality (four in this case) of core wire connection tray groups 9 are fixed to the tray fixing base plate 7. As shown in FIG. 3, the core wire connection tray group 9 includes a plurality (four in this case) of core wire connection trays 10 that can be opened and closed.

  The core wire connection tray 10 has the core wire accommodating portions 11 to 13 arranged in a line in the longitudinal direction. The core wire housing portion 12 is provided between the core wire housing portions 11 and 13.

  A core wire introducing portion 14 for introducing an optical fiber core wire is provided at the back side (back side) end of the core wire housing portion 11. A connecting portion mounting portion 15 for positioning and mounting a fusion splicing portion S1 (see FIG. 4) of different optical fiber core wires is provided in a portion of the core wire storing portion 11 adjacent to the core wire storing portion 12. It has been. The connection portion mounting portion 15 is provided so as to extend in the depth direction of the core wire connection tray 10. The core wire accommodating portion 11 is provided with a surplus length guide portion 16 for guiding the optical fiber core wire when the extra length of the optical fiber core wire is wound and accommodated. The core wire accommodating portion 11 is provided with a plurality of pressing plates 17 for pressing the optical fiber core wires.

  A core wire introducing portion 18 for introducing an optical fiber core wire is provided at the back end of the core wire housing portion 13. A connecting portion mounting portion 19 for positioning and mounting the fusion splicing portion S2 (see FIG. 4) of different optical fiber core wires is provided in a portion adjacent to the core wire housing portion 12 in the core wire housing portion 13. It has been. The connection portion mounting portion 19 is provided so as to extend in the depth direction of the core wire connection tray 10. The core wire accommodating portion 13 is provided with a surplus length guide portion 20 for guiding the optical fiber core wire when the extra length of the optical fiber core wire is wound and accommodated. The core wire accommodating portion 13 is provided with a plurality of pressing plates 21 for pressing the optical fiber core wires.

  A core wire guide portion 22 for guiding the optical fiber core wire between the core wire storage portions 11 and 12 is provided at the back end of the boundary portion between the core wire storage portions 11 and 12. A core wire guide portion 23 for guiding the optical fiber core wire between the core wire storage portions 12 and 13 is provided at the back end of the boundary portion of the core wire storage portions 12 and 13.

  The core wire accommodating portion 12 is provided with a splitter mounting portion 25 for positioning and mounting the optical splitter 24 (see FIG. 4). The splitter mounting portion 25 is disposed in the vicinity of the back end portion of the core wire housing portion 12. The core wire accommodating portion 12 is provided with a surplus length guide portion 26 for guiding the optical fiber core wire when the surplus length of the optical fiber core wire is wound and accommodated. The core wire accommodating portion 12 is provided with a plurality of pressing plates 27 for pressing the optical fiber core wires.

  As shown in FIG. 4, the optical splitter 24 is a (1 × 8) type optical branching device that branches one optical signal into eight optical signals, and includes one input optical fiber core 28 and a plurality of optical fibers. And an output optical fiber core wire 29. The input optical fiber core 28 is a single-core optical fiber core whose diameter is, for example, 0.25 mm. The allowable bending radius R of the input optical fiber core 28 is 30 mm or 15 mm. The output optical fiber core 29 is formed of, for example, a four-core fiber ribbon. The output optical fiber core 29 may be a reinforced single-core optical fiber, and the allowable bending radius R in this case is 30 mm or 15 mm.

  A plurality of types of optical fiber cores are accommodated in the core wire accommodating portions 11 to 13 in order from the upstream side of the fiber (the main trunk cable 2 side) to the downstream side of the fiber (the branch cable 4 side).

  Specifically, the connecting portion between one optical fiber core wire 30 extending from the main trunk cable 2 and the input optical fiber core wire 28 of the optical splitter 24 is housed in the core wire housing portion 11. The optical fiber core wire 30 is a single-core optical fiber core wire obtained by separating the optical fiber core wire 3 (here, a 4-core optical fiber tape core wire) from a single core. The optical fiber core wire 30 has a wire diameter of 0.25 mm, and the optical fiber core wire 30 has an allowable bending radius R of 30 mm. Therefore, the single-core optical fiber cores 28 and 30 having the same core type are accommodated in the core wire accommodating portion 11.

  The optical fiber core wire 30 is introduced into the core wire housing portion 11 from the core wire introduction portion 14. The input optical fiber core wire 28 is introduced from the core wire housing portion 12 through the core wire guide portion 22 into the core wire housing portion 11, and is further wound along the extra length guide portion 16.

  The fusion splicing portion S 1 between the optical fiber core wire 30 and the input optical fiber core wire 28 is attached to the connection portion attachment portion 15. Since the connection part mounting part 15 is provided in the part adjacent to the core wire accommodation part 12 in the core wire accommodation part 11 so as to extend in the depth direction of the core wire connection tray 10, the connection part attachment part 15 is attached from the core wire introduction part 14 The length of the optical fiber core 30 up to the section 15 can be shortened to the minimum necessary.

  In the core wire accommodating portion 12, the input optical fiber core wire 28 and the output optical fiber core wire 29 of the optical splitter 24 are accommodated together with the optical splitter 24. The optical splitter 24 is attached to the splitter attachment portion 25. Since the splitter mounting portion 25 is provided in the vicinity of the rear end of the core wire housing portion 12, the length of the input optical fiber core wire 28 from the core wire introducing portion 22 to the splitter mounting portion 25 is sufficiently short. The output optical fiber core wire 29 is wound along the surplus length guide portion 26. At this time, since the input optical fiber core 28 is not wound more than one turn along the extra length guide portion 26, the optical fiber core wires 28 and 29 having different core types are suppressed from being mixed in the core wire accommodating portion 12. The optical fiber core wires 28 and 29 do not become difficult to take out.

  The core wire accommodating portion 13 accommodates connection portions between the plurality of output optical fiber core wires 29 and the plurality of optical fiber core wires 5. The optical fiber core 5 may be formed of a four-core fiber tape core like the output optical fiber core 29, or may be a single-core optical fiber core with a wire diameter of 0.5 mm or 0.25 mm. May be.

  The fusion splicing portion S2 between the output optical fiber core wire 29 and the optical fiber core wire 5 is attached to the connection portion attachment portion 19. The output optical fiber core wire 29 and the optical fiber core wire 5 are wound along the surplus length guide portion 20. However, either one of the output optical fiber core wire 29 and the optical fiber core wire 5 is not wound more than one turn along the extra length guide portion 20. For this reason, mixing of the optical fiber core wires 5 and 29 having different core wire types in the core wire housing portion 13 is suppressed, and the optical fiber core wires 5 and 29 are not easily taken out.

  Returning to FIG. 1, auxiliary core wire connection trays 31 and 32 are disposed below the core wire connection tray group 9. As shown in FIG. 2, the auxiliary core wire connection trays 31 and 32 are attached to the tray fixing base plate 7 so as to be rotatable in the vertical direction.

  On the upper side of the core wire connection tray group 9, a core wire passing tray 33 is disposed. The core wire passing tray 33 accommodates the plurality of optical fiber core wires 3 exposed by removing the jacket of the intermediate portion of the main trunk main cable 2 and the optical fiber core wires 30 obtained by separating the optical fiber core wires 3 from each other. It is a tray. Among the plurality of optical fiber cores 30 separated from each other, some of the optical fiber cores 30 are cut and connected to the optical splitter 24, and the remaining optical fiber cores 30 are connected to the core wire passing tray. 33 is accommodated so as to pass as it is.

  As shown in FIG. 5, the core wire introducing portions 34 for introducing the optical fiber core wire 3 (including the optical fiber core wire 30) are provided at both ends of the core wire passing tray 33. The core wire passing tray 33 is provided with a plurality of pressing plates 35 for pressing the optical fiber core wires 3.

  The core wire passing tray 33 is attached to each tray fixing base plate 8 (see FIG. 2) so as to be rotatable in the vertical direction. Thereby, the core wire passing tray 33 can be tilted upward with respect to the core wire connecting tray group 9 as shown in FIG. At this time, the core wire passing tray 33 can be held in a state inclined about 30 degrees upward with respect to the core wire connecting tray group 9 by holding means such as a lock mechanism of the rotating shaft portion. . Each tray fixing base plate 8 is provided with a support arm 36 for placing the core wire passing tray 33 in a normal state.

  When the core wire passing tray 33 is tilted upward, the core wire introducing portion 34 of the core wire passing tray 33 comes closer to the main cable 2, so that the optical fiber core wire 3 is not pulled and the The influence on the fiber core wire 3 is small.

  As shown in FIGS. 7 and 8, a lower extension tray 37 is provided below the core wire passage tray 33 so as to be openable and closable around a rotation axis on the back side (back side) with respect to the core wire passage tray 33. ing. For example, when the optical splitter 24 is removed because the subscriber has canceled the optical communication contract, the connection between the input optical fiber core 28 and the optical fiber core 30 of the optical splitter 24 is removed, and the lower extension is performed. That is, the fiber core wire 30 is reconnected to the original optical fiber core wire 30, that is, the cut optical fiber core wires 30 are reconnected. The lower extension tray 37 is a tray for accommodating a reconnecting portion between the optical fiber cores 30 subjected to the lower extension.

  At both end portions of the lower extending tray 37, a core wire introducing portion 38 for introducing the optical fiber core wire 30 is provided. The lower extending tray 37 is provided with a connecting portion mounting portion 39 for positioning and mounting the fusion connecting portion between the cut optical fiber cores 30. The lower extending tray 37 is provided with a plurality of pressing plates 40 for pressing the optical fiber core wire 30.

  At the front end (front side) of the core wire passing tray 33, when the lower extending tray 37 is closed with respect to the core passing tray 33, the core passing tray 33 and the lower extending tray 37 are locked. Two hook portions 41 are provided, and two protrusions 42 that engage with the hook portions 41 are provided at the tip of the lower extension tray 37. By hooking each hook part 41 to each protrusion 42, the lower extension tray 37 is held in a closed state with respect to the core wire passing tray 33. Thereby, the core wire passing tray 33 and the lower extending tray 37 can be rotated and opened / closed separately or integrally.

  On either the left or right side of the core wire connection tray group 9, there is an extra length accommodation pocket 43 for accommodating the extra length of the optical fiber core wire 30 existing between the core wire connection tray 10 and the core wire passage tray 33. Is provided. The extra length accommodation pocket 43 is provided on the side corresponding to the upstream side of the closure 1. Here, assuming that the left side of the closure 1 is the upstream side, the extra length accommodation pocket 43 is provided on the left side of the core wire connection tray group 9.

  As shown in FIG. 9, the extra-length accommodation pocket 43 is detachably attached to the pocket base plate 44 that forms a part of the tray fixing base plate 8 and the pocket base plate 44. It comprises a pressing plate 45 that presses the optical fiber core wire 30 existing between the wire passing tray 33 and the pocket base plate 44.

  The pocket base plate 44 is provided with a locking projection 46 that extends toward the front side. The holding plate 45 is formed with two locking window holes 47 that engage with the locking projections 46 on the left and right. A hinge portion 45 a for opening and closing the pressing plate 45 with respect to the pocket base plate 44 in the vertical direction is provided at the lower portion of the pressing plate 45. When the pressing plate 45 is closed with respect to the pocket base plate 44 by hooking one of the two locking window holes 47 on the tip of the locking projection 46, it is directed toward the upper side of the extra length accommodation pocket 43. The holding plate 45 is inclined with respect to the pocket base plate 44 so as to increase the space. For this reason, the optical fiber core wire 30 led out from the core wire passage tray 33 can be easily wired and accommodated in the core wire connection tray 10.

  In addition, since the pressing plate 45 can be attached to and detached from the pocket base plate 44, the pressing plate 45 can be replaced according to the position on the upstream side of the closure 1, so that there is only one pressing plate 45. As a result, the number of parts can be reduced.

  As shown in FIG. 10, the auxiliary core wire connection tray 32 moves the core wire connection tray group 9, the auxiliary core wire connection trays 31 and 32, the core wire passage tray 33 and the lower extension tray 37 with respect to the frame body 6. A tray pressing plate 48 is attached for fixing so as not to exist.

  As described above, in the closure 1 of the present embodiment, the core wire passing tray 33 is attached to the tray fixing base plate 7 so as to be pivotable in the vertical direction. By tilting upward with respect to the wire connection tray group 9, a work space is formed above the core wire connection tray group 9. For this reason, in order to secure a work space for the core wire connection tray 10, it is not necessary to pull out the core wire connection tray group 9 to the near side. Accordingly, since a mechanism for moving the core wire connection tray group 9 is not required, the structure of the closure 1 is simplified, and the cost can be reduced. Further, since the optical fiber core wires are restrained from being pulled or suddenly bent by the movement of the core wire connection tray group 9, it is possible to prevent the transmission characteristics of the optical fiber core wires from being adversely affected.

  Moreover, since the extra length accommodation pocket 43 for accommodating the extra length of the optical fiber core wire 30 existing between the core wire connection tray 10 and the core wire passage tray 33 is provided on one side of the core wire connection tray group 9. The optical fiber core wire 30 can be protected.

  The present invention is not limited to the above embodiment. For example, in the above embodiment, the core wire connection tray 10 has the core wire accommodating portions 11 to 13, but the number of the core wire accommodating portions in the core wire connection tray is not particularly limited to three, and two The following may be sufficient, and four or more may be sufficient.

  In the above embodiment, the extra length accommodation pocket 43 is provided only on one side of the core wire connection tray group 9, but the extra length accommodation pocket 43 may be provided on both the left and right sides of the core wire connection tray group 9. In this case, the operator does not have to change the holding plate 45 one by one.

  Furthermore, the closure 1 of the above embodiment is a connection form in which an optical splitter 24 is interposed between the optical fiber core wire 3 of the main trunk cable 2 and the optical fiber core wire 5 of the branch cable 4. The present invention is applicable as long as the optical fiber core wire 3 of the main trunk cable 2 and the optical fiber core wire 5 of the branch cable 4 are connected.

  DESCRIPTION OF SYMBOLS 1 ... Optical fiber connection closure, 2 ... Trunk main cable (1st optical cable), 3 ... Optical fiber core wire (1st optical fiber core wire), 4 ... Branch cable (2nd optical cable), 5 ... Optical fiber core wire (Second optical fiber core wire) 10 ... core wire connection tray, 11 to 13 ... core wire housing part, 30 ... optical fiber core wire (first optical fiber core wire), 33 ... core wire passage tray, 37 ... lower part Extension tray, 43 ... extra length accommodation pocket (extra length accommodation section), 44 ... pocket base plate, 45 ... presser plate.

Claims (3)

In an optical fiber connection closure for connecting a first optical fiber core wire built in a first optical cable and a second optical fiber core wire built in a second optical cable,
A core connection tray for accommodating a connection portion between the first optical fiber core and the second optical fiber core;
A core wire passing tray for accommodating the first optical fiber core wire, which is disposed on the upper side of the core wire connection tray and is exposed by removing a jacket of an intermediate portion of the first optical cable;
The core wire passing tray is rotatably provided so as to be inclined upward with respect to the core wire connecting tray ,
In order to accommodate a reconnection portion between the first optical fiber cores cut when connecting the first optical fiber core wire and the second optical fiber core wire at a lower portion of the core wire passing tray. The lower extension tray is provided,
The optical fiber connection closure , wherein the lower extension tray is attached to the core wire passing tray so as to be openable and closable. A surplus length accommodating portion that is disposed on a side of the core wire connecting tray and accommodates an extra length of the first optical fiber core wire existing between the core wire passing tray and the core wire connecting tray; In addition,
The extra length accommodating portion includes a base plate, openably provided on the base plate, according to claim 1 Symbol characterized in that it comprises a pressing plate for pressing said first optical fiber to said base plate An optical fiber connection closure. The base plate is provided on both left and right sides of the core wire connection tray,
The optical fiber connection closure according to claim 2 , wherein the pressing plate is detachably attached to the base plate.

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