JP2011070124A - Tray for optical wiring, and closure with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tray for optical wiring capable of wiring many coated optical fibers in a limited space in a closure, without increasing the storage number of coated optical fibers in a surplus length storage part, and to provide the closure with the tray. <P>SOLUTION: This terminating tray 33 used for the closure for optical cable connection for storing connections where each coated optical fiber 24 of an optical cable in a trunk line system and an optical drop cable is connected together includes an upper layer tray 41 and a lower layer tray 51 which are separated into two layers in the thickness direction. The upper layer tray 41 and the lower layer tray 51 are turnably connected on one side in the width direction of the terminating tray 33, and each surplus length storage part 42, 52 for storing the surplus length of the coated optical fibers 24 and a plurality of connection fixing parts 43, 53 for fixing connectors C to which each coated optical fiber 24 is connected are provided on the upper layer tray 41 and the lower layer tray 51, respectively, and the plurality of connection fixing parts 43, 53 are arranged in parallel on a common plane while the upper layer tray 41 and the lower layer tray 51 are stacked. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an optical wiring tray that accommodates a connecting portion between a trunk-system optical cable and an optical drop cable, and a closure including the same.

  2. Description of the Related Art In recent years, a form called FTTH (Fiber To The Home) that directly draws an optical fiber to a subscriber's house has been adopted as a network using optical cables. In this FTTH, from a few cores to several tens of optical cables wired in the vicinity of a subscriber's home as a network of a telecommunications carrier, it is branched into, for example, a required number of optical drop cables of about 1 to 2 cores, Pull into the network subscriber's home.

  As a closure used for such FTTH, a connector holding portion that holds a plurality of connectors for connecting optical fiber cores of a trunk optical cable and an optical drop cable, and an extra length that accommodates an extra length of the optical fiber core wire 2. Description of the Related Art A tray having a housing portion, a splitter tray that houses an optical module such as a splitter, and the like are stacked and attached inside (for example, see Patent Document 1).

JP 2007-121603 A

With the promotion of FTTH, there is an increasing demand for drawing an optical fiber to a subscriber's house, and a large number of optical drop cables are drawn from the closure and added.
In this case, it is conceivable to increase the number of optical fiber cores accommodated in one tray in the closure. However, when a large number of optical fiber cores are accommodated in one tray, the optical fiber cores are easily entangled in the extra length accommodating portion of the tray, and it is difficult to discriminate the optical fiber core wires.
It is also conceivable to increase the number of optical fiber cores that can be accommodated by reducing the thickness of the tray and increasing the number of stacked trays. However, since the thickness of the connector holding portion provided in the tray cannot be made thinner than the thickness of the connector, it is difficult to increase the number of stacked layers by reducing the thickness of the tray.

  An object of the present invention is to provide an optical wiring tray capable of wiring a large number of optical fiber cores in a limited space within a closure without increasing the number of optical fiber core wires accommodated in an extra length accommodating portion. And providing a closure provided with the same.

The optical wiring tray of the present invention capable of solving the above-mentioned problems is an optical wiring tray used for an optical cable connection closure that accommodates a connection portion where optical fiber cores of a trunk optical cable and an optical drop cable are connected to each other. Because
It has an upper layer tray and a lower layer tray divided into two layers in the thickness direction,
The upper layer tray and the lower layer tray are rotatably coupled on one side in the width direction of the tray,
An extra length accommodating portion for accommodating the extra length of the optical fiber core wire and a plurality of connection fixing portions for fixing a connection portion where the optical fiber core wires are connected to each other are provided in the upper layer tray and the lower layer tray, respectively. And
The plurality of connection fixing portions are arranged in parallel on a common plane in a state where the upper layer tray and the lower layer tray are overlapped.

In the optical wiring tray of the present invention, the plurality of connection fixing portions are arranged separately in the width direction in the upper layer tray and the lower layer tray,
The connection fixing portion of the lower layer tray is disposed on one side in the width direction,
It is preferable that the connection fixing portion of the upper tray is disposed on the other side in the width direction.

In the optical wiring tray of the present invention, in each of the upper layer tray and the lower layer tray,
The surplus length accommodating portion is disposed at the center in the longitudinal direction of the tray, and the connection fixing portions are disposed on both sides in the longitudinal direction of the tray with respect to the surplus length accommodating portion,
The core wire guide provided in the surplus length accommodating portion is formed so as to be able to guide the optical fiber core wire extending from the connection fixing portion substantially straight to the vicinity of the longitudinal center of the surplus length accommodating portion. Is preferred.

  In the optical wiring tray according to the present invention, in each of the upper layer tray and the lower layer tray, the entrances of the optical fiber core wires from the trunk optical cable to the extra length accommodating portion are both connected to the upper layer tray and the lower layer tray. It is preferable to be provided in the vicinity of the dynamic center axis.

  In the optical wiring tray of the present invention, it is preferable that a core wire retaining sheet having a locking portion capable of holding the optical fiber core wire is attached to a position covering the extra length housing portion.

In the optical wiring tray of the present invention, the core wire holding sheet is rotatably attached,
When the core wire retaining sheet is rotated and lifted from the surplus length accommodating portion, a sheet locking portion is provided that locks one end of the core wire retaining sheet at a position different from the rotation shaft and is self-supporting. Is preferred.

  Further, the closure of the present invention is characterized in that any of the optical wiring trays of the present invention is stacked and accommodated in a plurality of stages.

According to the optical wiring tray of the present invention, the connection fixing portion that fixes the connection portion that is difficult to reduce in thickness is arranged in parallel on a common plane in a state where the upper layer tray and the lower layer tray are overlapped. By doing so, the surplus length accommodating part can be made into a two-layer structure, suppressing the increase in thickness. Thus, a large number of optical fiber cores can be wired in a limited space within the closure without increasing the number of optical fiber cores accommodated in the surplus length accommodating portion.
And according to the closure of this invention, even if the request | requirement which draws in an optical fiber by promotion of FTTH increases, it can respond to the request | requirement easily by increasing the number of wiring of an optical fiber core wire.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows one Embodiment of the closure provided with the tray for optical wiring which concerns on this invention, Comprising: (a) is the top view which looked at one part in cross section, (b) is a longitudinal cross-sectional view, (c) is a cross section FIG. It is a figure explaining the accommodation state of the termination tray and splitter tray in the closure of FIG. 1, Comprising: (a) And (b) is a side view, respectively. It is a perspective view which shows the structure of the termination | terminus tray accommodated in the closure of FIG. It is a perspective view of the state which opened the upper layer tray and lower layer tray of the termination | terminus tray of FIG. It is a figure which shows the structure of the termination | terminus tray of FIG. 3, Comprising: (a) is a top view, (b) is a front view, (c) is a side view. It is a figure which shows the upper layer tray which comprises the termination | terminus tray of FIG. 3, Comprising: (a) is a top view, (b) is a front view, (c) is a side view. It is a figure which shows the lower layer tray which comprises the termination | terminus tray of FIG. 3, Comprising: (a) is a top view, (b) is a front view, (c) is a side view. It is a partial top view in the connection side of the upper layer tray which shows the support structure of a core wire reservation sheet.

Hereinafter, an example of an embodiment of an optical wiring tray and a closure provided with the same according to the present invention will be described with reference to the drawings.
As shown in FIG. 1, the optical cable connection closure 11 includes a case main body 12 whose front and rear surfaces can be opened, and the inside of the case main body 12 is an optical cable housing space 15.

Cable outlets 16 and 17 are provided at both ends of the closure 11, and the optical cable 21 of the trunk line system and the drop cable 22 for drawing into each subscriber's house can be led out by the cable outlets 16 and 17. It is said that.
The cable lead-in / out sections 16 and 17 are attached with grommets made of a rubber material that is in close contact with the cable to be led in / out, and rainwater or the like enters the optical cable housing space 15 of the closure 11 through the cable. Is prevented.

In addition, a high waterproofness and light resistance can be ensured by providing a packing at the mating portion between the case body 12 and the cable lead-in / out portions 16 and 17 as appropriate, or by having a structure in which the respective edges overlap. Has been.
The trunk-system optical cable 21 drawn into the optical cable housing space 15 from the cable lead-in / out section 17 is gripped by the cable TM gripping tool 23, and the optical fiber core 24 pulled down from the optical cable 21 is connected to a connector (not shown). And then connected to the optical fiber core 24 of the drop cable 22 via the splitter tray 34 and the termination tray 33.

  In the optical cable housing space 15 of the closure 11, a tray fixing base 31 arranged in the vertical direction is provided. A tray storage case 32 is attached to the tray fixing base 31, and a plurality of termination trays 33 and splitter trays 34, which are a plurality of optical wiring trays, are stacked and stored in the tray storage case 32. Has been. The termination tray 33 accommodates the connecting portion and the extra length portion of the optical fiber core wire 24, and the splitter tray 34 accommodates an optical splitter that branches the optical signal.

As shown in FIG. 2A, the tray storage case 32 is formed with a plurality of stages of tray storage portions 37 partitioned by a plurality of partition walls 36. The termination tray 33 and the splitter tray 34 are arranged in the tray storage. It is stored in each part 37.
The tray storage case 32 has a tray support portion 38 that can be pulled out to the opening side of the closure 11 (left side in FIG. 2). The end tray 33 and the splitter tray 34 are supported so that the end on the back side opposite to the opening side of the closure 11 is rotatable with respect to the tray support portion 38 about a horizontal axis.

  When the tray support portion 38 is pulled out to the opening side of the closure 11, the termination tray 33 and the splitter tray 34 are pulled out from the tray storage portion 37 of the tray storage case 32 as shown in FIG. In this state, the termination tray 33 and the splitter tray 34 can be rotated with respect to the tray support portion 38.

  For example, when the work is performed on the termination tray 33 or the splitter tray 34, the tray on the lower side of the termination tray 33 or the splitter tray 34 to be worked is rotated downward, so that the termination tray 33 or the splitter tray to be worked on. The termination tray 33 or splitter tray 34 above 34 is rotated upward. If it does in this way, the upper surface side of the termination | terminus tray 33 or the splitter tray 34 of work object can be opened widely, and a smooth operation | work will be attained. When working with the uppermost termination tray 33, all the termination trays 33 and splitter trays 34 are rotated downward and tilted.

Next, the structure of the termination tray 33 which is an optical wiring tray according to the present invention will be described.
As shown in FIGS. 3 to 5, the termination tray 33 has an upper layer tray 41 and a lower layer tray 51 which are divided into two layers in the thickness direction. The upper layer tray 41 and the lower layer tray 51 are connected to each other at connection portions 49 and 59 on the connection portion side with the tray support portion 38 on one side in the width direction.

  As shown in FIG. 6, the upper layer tray 41 includes an extra length accommodating portion 42 that accommodates an extra length of the optical fiber core 24 introduced from the trunk optical cable 21, an optical fiber core 24 and the drop cable 22 side. It has a plurality of connection fixing portions 43 for receiving and fixing a connector (connection portion) C for connecting the optical fiber core wire 22a, and the extra length accommodating portion 42 has a thickness dimension of the connection fixing portion. It is approximately half of 43.

  The surplus length accommodating portion 42 has a pair of core wire guides 44 protruding upward. In the surplus length accommodating portion 42, the periphery of the core wire guide 44 serves as an accommodating path for the optical fiber core wire 24. . Four connection fixing portions 43 are arranged in the width direction at both ends in the longitudinal direction of the upper layer tray 41, and are arranged in parallel on the other side in the width direction opposite to the connection side with the lower layer tray 51. Yes.

  In the upper layer tray 41, the extra length of the optical fiber core wire 24 extending from the connector C housed and secured in the connection securing portion 43 is guided substantially straight to the vicinity of the center in the longitudinal direction of the surplus length housing portion 42. The wire guides 44 pass between each other, and are arranged along the periphery of the wire guide 44 to reach the wire introduction port 56.

  Thus, in the upper layer tray 41, the extra length of the optical fiber core 24 extending from the connector C is guided substantially straight to the vicinity of the center in the longitudinal direction of the extra length accommodating portion 42. Bending less than the allowable bending radius can be prevented, and transmission loss due to bending can be eliminated.

  As shown in FIG. 7, the lower layer tray 51 connects the extra length accommodating portion 52 that accommodates the extra length of the optical fiber core 24, and the optical fiber core 24 and the optical fiber core 22 a on the drop cable 22 side. It has a plurality of connection fixing portions 53 for receiving and fixing the connector C, and the surplus length accommodating portion 52 is approximately half the thickness of the connection fixing portion 53.

  The surplus length accommodating portion 52 has four core wire guides 54 protruding upward. In the surplus length accommodating portion 52, the periphery of the core wire guide 54 is a housing path for the optical fiber core wire 24. . Four connection fixing portions 53 are arranged in the width direction at both ends in the longitudinal direction of the lower layer tray 51, and are arranged side by side on one side in the width direction, which is a connection side with the upper layer tray 41.

  In this lower layer tray 51, the extra length portion of the optical fiber core wire 24 extending from the connector C accommodated and fixed in the connection fixing portion 53 is passed between the core wire guides 54, and the longitudinal direction in the extra length accommodation portion 52. To the vicinity of the center of the guide wire, and is passed between the core wire guides 54, arranged along the periphery of the core wire guide 54, and reaches the core wire introduction port 56.

Thus, also in the case of the lower layer tray 51, the extra length portion of the optical fiber core wire 24 extending from the connector C is guided substantially straight to the vicinity of the center in the longitudinal direction of the extra length accommodating portion 52. It is possible to prevent the wire 24 from being bent below the allowable bending radius, and to eliminate transmission loss due to the bending.
In the lower tray 51, the number of the core guides 54 is different from that of the core guide 44 of the upper tray 41, so that the optical fiber core 24 extending from the connector C is not bent below the allowable bending radius. Wiring to the extra length accommodating portion 52 is possible without difficulty. Further, it is possible to prevent the optical fiber core wire 24 from being caught when the upper layer tray 41 is overlaid.

  And in the termination | terminus tray 33 which has the upper layer tray 41 and the lower layer tray 51 which have the said structure, if the upper layer tray 41 and the lower layer tray 51 are piled up, each connection fixing | fixed part 43 and 53 of the upper layer tray 41 and the lower layer tray 51 will become. Are arranged in parallel on a common plane. Further, in this state, the extra length accommodating portions 42 and 52 of the upper layer tray 41 and the lower layer tray 51 are overlapped, and the thickness dimension thereof is substantially the same as the thickness dimension of the connection fixing portions 43 and 53. That is, the termination tray 33 is a state in which the upper layer tray 41 and the lower layer tray 51 are overlapped with each other, and the entire thickness dimension thereof becomes the thickness dimension of the connection fixing portions 43 and 53.

  Further, in the termination tray 33, the upper layer tray 41 can be opened widely by rotating the upper layer tray 41 upward with respect to the lower layer tray 51, and the wiring work in the lower layer tray 51 can be smoothly performed. Can be done. At this time, since the connection fixing portion 43 of the upper layer tray 41 is disposed on the opening side of the closure 11, the operator grasps and lifts the connection fixing portion 43 of the upper layer tray 41 to remove the lower layer tray 51. The upper surface side can be easily opened.

  An engaging portion 48 formed on the upper layer tray 41 and an engaging claw 58 formed on the lower layer tray 51 are provided on the opposite side of the connection position of the termination tray 33 with the tray support portion 38. Then, by engaging the engaging portion 48 with the engaging claw 58, the upper layer tray 41 and the lower layer tray 51 are engaged, and the upper layer tray 41 and the lower layer tray 51 are maintained in a stacked state.

Moreover, the core wire introduction ports 56 are formed on both sides of the lower layer tray 51 in the longitudinal direction, and the optical fiber core wires 24 of the optical cable 21 are introduced from the core wire introduction ports 56. The introduced optical fiber core wire 24 is led to the extra length accommodating portions 42 and 52 of the upper layer tray 41 and the lower layer tray 51.
The core wire introduction port 56 is provided in the vicinity of the rotation center axis (the rotation axis of the connection portions 49 and 59) on one side in the width direction that is the connection side between the upper layer tray 41 and the lower layer tray 51. Yes. Thereby, even if the upper layer tray 41 and the lower layer tray 51 are relatively rotated, the distance from the core wire introduction port 56 to each of the extra length accommodating portions 42 and 52 does not change, and the core wire introduction port 56 Pulling or slackening the optical fiber core wires 24 led to the extra length accommodating portions 42 and 52 of the upper layer tray 41 and the lower layer tray 51 can be suppressed as much as possible.

As shown in FIGS. 3 and 4, the upper layer tray 41 and the lower layer tray 51 constituting the termination tray 33 are respectively provided with a core wire retaining sheet 61 so as to cover the upper portions of the extra length accommodating portions 42 and 52. Is provided.
The core wire retaining sheet 61 is formed of a thin plastic sheet, and is formed by a pair of key claw-like support portions 62 on the connection side of the upper layer tray 41 and the lower layer tray 51 with respect to the upper layer tray 41 and the lower layer tray 51. It is rotatably supported.
A plurality of engaging portions 63 capable of holding the optical fiber core wire 24 are formed in the core wire retaining sheet 61. To the engaging portion 63 while winding the optical fiber core wire 24 that is not used for connection during initial wiring. By locking in order, the optical fiber core wire 24 not used for connection can be held.

  As shown in FIG. 8, the upper layer tray 41 and the lower layer tray 51 are provided with sheet locking portions 64 formed of wall surfaces and ribs between the support portions 62. The sheet locking portions 64 are formed at different positions shifted with respect to the rotation axis of the core wire retaining sheet 61 by the support portion 62, and the sheet locking portions 64 are the upper layer tray 41 and the lower layer tray 51. In the state where the core wire retaining sheet 61 is rotated in the direction of opening the upper surface of the core wire, one end of the core wire retaining sheet 61 can be deformed and locked. When the core wire retaining sheet 61 is locked to the sheet locking portion 64, the core wire retaining sheet 61 is bent at the support portion and straightened in a direction orthogonal to the bending direction. As a result, the core wire retaining sheet 61 can be stably made independent with respect to the upper layer tray 41 or the lower layer tray 51, and the extra length accommodating portions 42 and 52 of the upper layer tray 41 or the lower layer tray 51 can be maintained in an open state. it can.

  As shown in FIGS. 3 and 4, a cover plate 65 is provided on the upper portion of the surplus length accommodating portion 42 of the upper layer tray 41, and the surplus length accommodating portion 42 of the upper layer tray 41 is protected by the cover plate 65. ing. The cover plate 65 is rotatably supported by a pair of key-claw-shaped support portions 62 similarly to the core wire retaining sheet 61. By rotating the cover plate 65, the extra length of the upper tray 41 is obtained. The accommodating part 42 is opened and closed.

According to the termination tray 33 which is an optical wiring tray according to the present embodiment, the connection fixing portions 43 and 53 for receiving and fixing the connector C having a predetermined thickness dimension are connected to the upper layer tray 41 and the lower layer tray 51. By arranging them in parallel on a common plane in a stacked state, the extra length accommodating portions 42 and 52 can have a two-layer structure while suppressing an increase in thickness. As a result, by increasing the number of optical fiber cores 24 accommodated in the extra length accommodating portion 42.52, the inside of the closure 11 does not cause entanglement between optical fiber cores 24 and difficulty in discrimination. A large number of optical fiber cores 24 can be wired in a limited space.
According to the closure 11 having the termination tray 33 described above, even if the demand for drawing an optical fiber increases due to the promotion of FTTH, the number of the optical fiber core wires 24 can be easily increased in response to the demand. Can respond.

  11: Closure, 21: Optical cable, 22: Optical drop cable, 24: Optical fiber core wire, 33: Termination tray (optical wiring tray), 41: Upper layer tray, 42, 52: Extra length accommodating part, 43, 53 : Connection fixing portion, 44, 54: Core wire guide, 51: Lower layer tray, 61: Core wire retaining sheet, 63: Locking portion, 64: Sheet locking portion, C: Connector (connection portion)

Claims (7)

An optical wiring tray used in an optical cable connection closure that accommodates a connection portion in which optical fiber cores of a trunk optical fiber cable and an optical drop cable are connected to each other,
It has an upper layer tray and a lower layer tray divided into two layers in the thickness direction,
The upper layer tray and the lower layer tray are rotatably coupled on one side in the width direction of the tray,
An extra length accommodating portion for accommodating the extra length of the optical fiber core wire and a plurality of connection fixing portions for fixing a connection portion where the optical fiber core wires are connected to each other are provided in the upper layer tray and the lower layer tray, respectively. And
The optical wiring tray, wherein the plurality of connection fixing portions are arranged in parallel on a common plane with the upper tray and the lower tray stacked. The optical wiring tray according to claim 1,
The plurality of connection fixing portions are arranged separately in the width direction in the upper layer tray and the lower layer tray,
The connection fixing portion of the lower layer tray is disposed on one side in the width direction,
The optical wiring tray, wherein the connection fixing portion of the upper tray is disposed on the other side in the width direction. The optical wiring tray according to claim 1 or 2,
In each of the upper tray and the lower tray,
The surplus length accommodating portion is disposed at the center in the longitudinal direction of the tray, and the connection fixing portions are disposed on both sides in the longitudinal direction of the tray with respect to the surplus length accommodating portion,
The core wire guide provided in the surplus length accommodating portion is formed so as to be able to guide the optical fiber core wire extending from the connection fixing portion substantially straight to the vicinity of the longitudinal center of the surplus length accommodating portion. A tray for optical wiring. The optical wiring tray according to any one of claims 1 to 3,
In each of the upper layer tray and the lower layer tray, the entrance of the optical fiber core wire from the trunk optical cable to the extra length accommodating portion is provided in the vicinity of the rotation center axis of the upper layer tray and the lower layer tray. An optical wiring tray characterized by that. An optical wiring tray according to any one of claims 1 to 4,
An optical wiring tray, wherein a core wire retaining sheet having a locking portion capable of holding an optical fiber core wire is attached to a position covering the extra length housing portion. The optical wiring tray according to claim 5,
The core wire retaining sheet is rotatably attached,
When the core wire retaining sheet is rotated and lifted from the surplus length accommodating portion, a sheet locking portion is provided that locks one end of the core wire retaining sheet at a position different from the rotation shaft and is self-supporting. A tray for optical wiring.   A closure comprising the optical wiring tray according to any one of claims 1 to 6 stacked and accommodated in a plurality of stages.

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