JP2002022969A - Optical wiring board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical wiring board capable of performing connecting work without adversely influencing the optical characteristics of an optical fiber. SOLUTION: The board is provided with an optical fiber casing 8 which houses a connecting part where one optical fiber 7 is connected to the other fiber 5 switchably, a frame which houses the casing drawably, and a supporting mechanism 10 which supports the casing 8 so as to be freely drawably from and able to be housed into the frame. The supporting mechanism 10 is provided with a transfer rail 12 which is extended over from the housing position 20 to the drawing position 21 of the casing 8 and by which the casing 8 is moved up to the drawing position 21 in the state of maintaining an attitude in housing, and the optical fiber casing 8 which is drawn out to the drawing position 21 along the transfer rail 12 can be tilted at an arbitrary angle by a turning shaft 13 along the transfer rail 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical distribution board for switchably connecting a cable side optical fiber on an optical cable side to another optical fiber.

[0002]

2. Description of the Related Art Conventionally, an optical distribution board for connecting an optical fiber on the optical cable side, such as an external optical cable, to another optical fiber, for example, an optical fiber on the transmission apparatus side, is shown in FIGS. Is provided.
In the optical distribution board shown here, a plurality of terminations 62 are provided in multiple stages in a frame 61, and a plurality of optical fiber cases 63 are housed side by side in these terminations 62 in a vertically placed state. It is configured. The optical fiber case 63 is
It is formed in a plate shape having an inlet 63a for guiding the optical fiber into the inside, and is connected to the horizontal rotary shaft 64 via a rotary connection portion 63b, which is a universal joint provided at the front end, and rotates around the rotation connection portion 63b as a fulcrum. By being moved, it is pulled out forward, and in this pulled-out state, it can be brought into a state of lying down with the rotation connecting portion 63b as a fulcrum.

As shown in FIGS. 11 to 13, an optical cable 6 such as an external optical cable drawn into an optical distribution board.
The cable side optical fiber 66 pulled out from the five terminals is
It is terminated so as to be connectable to a connector, pulled into a target one of the termination portions 62, and pulled into a target one of the optical fiber cases 63 in the termination portion 62. on the other hand,
The optical fiber 68 is terminated so as to be connectable to a connector, is drawn into the optical fiber case 63 of the intended termination portion 62, and is switchably connected to the cable-side optical fiber 66 in the optical fiber case 63. . The extra lengths of the optical fibers 66 and 68 are bent and housed in the optical fiber case 63 in a state where a bending radius that does not affect optical characteristics is secured.

As shown in FIG. 15, when the optical fibers 66 and 68 are connected in the optical fiber case 63, the optical fiber case 63 is supported by a rotation connecting portion 63b as shown by an arrow in the drawing. The optical fiber case 6 pulled out after being pulled forward by rotating as
3 is turned sideways with the rotation connecting portion 63b as a fulcrum, and then the lid is opened to perform the operation. At this time, the optical fiber case 63 is placed substantially horizontally on the case support bar 70. Next, as shown in FIG. 16, the optical fiber case 63 is temporarily fixed to a case fixture 71 attached to the case support bar 70. This temporary fixing can be performed by engaging a pin 72 formed on the case fixture 71 with an engaging hole 73 of the optical fiber case 63.
In this manner, the connection operation is performed with the optical fiber case 63 opened.

[0005]

However, in the above-mentioned optical distribution board, when the optical fiber case 63 is pulled out by turning about the rotation connecting portion 63b as a fulcrum, or when the optical fiber case is brought to a side-down state, the optical distribution board is connected. The fiber may be twisted and adversely affect optical characteristics. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an optical wiring board that can perform a connecting operation without adversely affecting optical characteristics of an optical fiber.

[0006]

SUMMARY OF THE INVENTION An optical distribution board according to the present invention comprises: an optical fiber case for accommodating a switchable connection between a cable-side optical fiber on the optical cable side and another optical fiber; A frame for removably storing the fiber case, and a support mechanism for supporting the optical fiber case with respect to the frame so that the optical fiber case can be pulled out and stored in the frame. The support mechanism stores the optical fiber case in the frame. A movable rail extending from the storage position to be extended to the extended position outside the frame and capable of moving the optical fiber case to the extended position while maintaining the posture at the time of storage; and a movable rail provided along the movable rail. And a rotation axis for inclining the optical fiber case drawn out to the drawing position along the arbitrary angle at an arbitrary angle. That. In the optical wiring board of the present invention, when the optical fiber case is pulled out, the optical fiber case can be moved forward while maintaining the posture, so that the optical fiber may be twisted at the time of pulling out. Therefore, it is possible to prevent the transmission characteristics from deteriorating. In addition, it is possible to suppress vibration and the like during the pulling operation to a low level, and to prevent an adverse effect on the optical fiber in a live state in another optical fiber case. Further, the optical fiber case pulled out to the drawn position along the moving rail can be tilted at an arbitrary angle with the rotation axis, so that the optical fiber case is tilted at a desired angle. Can be done. For this reason, the twist applied to the optical fiber when the optical fiber case is inclined can be reduced by reducing the inclination angle. Therefore, it is possible to minimize the deterioration of the transmission characteristics of the optical fiber due to the twist.

In addition, the supporting mechanism is constructed so that it can be pulled out and stored in the frame while the optical fiber case is suspended, so that the optical fiber case is tilted by its own weight at the time of pulling out or storing work. This can prevent an excessive twist or vibration from being applied to the optical fiber by mistake.

Further, by providing the moving rail so as to extend along the direction in which the optical fiber case is disposed,
The space required for the optical fiber case to move when the optical fiber case is pulled out or stored can be minimized, the space in the frame can be effectively used, and the entire size can be reduced.

[0009]

1 to 4 show an embodiment of an optical wiring board according to the present invention. FIG. 1 is a front view of the optical wiring board of the present embodiment, and FIG. 1 (b) is a front view, FIG. 2 (c) is a side view, FIG. 3 is a perspective view showing an internal structure of an optical fiber case, and FIG. 4 (a). 4) is a side view showing the optical fiber case holding mechanism, and FIG. 4 (b) is a front view showing the optical fiber case holding mechanism. In the following description, the terms “front” and “rear” refer to the near side and the far side in FIG. 1. In addition, left and right refer to left and right in FIG.

The optical distribution board shown here comprises a plurality of optical fibers accommodating a connection portion 11 in which a cable-side optical fiber 7 drawn from an optical cable 3 such as an external optical cable and another optical fiber 5 are switchably connected. Case 8, an optical fiber case 8 that can be pulled out and stored therein, a frame 1, a support mechanism 10 that supports the optical fiber case 8 with respect to the frame 1 so that the optical fiber case 8 can be drawn out and stored, and holds the optical fiber case 8. The optical fiber case holding mechanism 26 is provided.

As shown in FIG. 1, an optical cable introducing section 4 for introducing an optical cable 3 into the frame 1 is provided in the frame 1.
And an optical fiber fixing section 6 for fixing an optical fiber 5 such as a transmission device side optical fiber (jumper cord or the like). The space in the frame 1 is vertically divided into multiple stages (seven stages in this embodiment) by a plurality of partition plates 14 mounted substantially horizontally, and these compartments are respectively provided with the optical fiber case 8 and the support A mechanism 10 is provided. Hereinafter, these sections will be referred to as termination sections 2.

As shown in FIGS. 2 (c) and 3, the optical fiber case 8 is formed in a long plate shape having a curved rear edge portion 8a, and has a container-like case body 8b and a case body 8b. And a lid 8d hinged to the lower edge 8c. The optical fiber case 8 can accommodate an optical fiber introduced therein through an outlet 8f formed at a rear portion of the upper edge 8e while securing a bending radius that does not affect optical characteristics. . Reference numeral 8 in FIG.
g indicates a connection part storage part for storing the connection part 11.

As shown in FIGS. 2A and 2B, the plurality of optical fiber cases 8 are arranged substantially vertically along the front-rear direction, and are arranged side by side in a stacked arrangement. It is suspended by a support mechanism 10 attached to an attachment plate 9 provided for each termination 2.

The support mechanism 10 moves the optical fiber from a storage position (position 20 shown in FIG. 2C) in which the optical fiber case 8 is stored in the frame 1 to a front pull-out position (described later) outside the frame 1. A moving rail 12 for moving the use case 8 and a rotating shaft 13 along the moving rail 12 are provided.

The moving rail 12 is attached to the lower surface side of the mounting plate 9 and extends from the storage position 20 to a draw-out position (described later) along the front-rear direction which is the direction in which the optical fiber case 8 is disposed. By moving the optical fiber case 8 along the moving rail 12, it is possible to move the optical fiber case 8 to the pull-out position while maintaining the stored state. The rotating shaft 13 is connected to the moving rail 12.
The optical fiber case 8 pulled out to the pulling-out position along the direction can be inclined at an arbitrary angle.

As shown in FIG. 4, the optical fiber case holding mechanism 26 has a mounting portion 23 movably mounted to the left and right along the rail 22 at the front edge of the partition plate 14, and the mounting portion 23 It has a connecting bar 24 attached thereto and an optical fiber case holding plate 25 attached to the tip of the connecting bar 24. Optical fiber case holding plate 2
Reference numeral 5 denotes an optical fiber which is configured to be rotatable with a rotation axis along the front-rear direction and can be temporarily fixed to the connecting bar 24 at an arbitrary inclination angle, and which is tilted in a state where it is pulled out to the pull-out position. The case 8 can be held in an inclined state by being superimposed on the use case 8.

The optical fiber case 8 in the storage position is attached to the frame 1 so that the optical fiber case 8 in the storage position does not accidentally come out of the frame 1 on the mounting plate 9.
There is a locking mechanism (not shown) that locks inside.
The optical fiber case 8 remains in the frame 1 unless the pull-out operation is forcibly performed.

Next, the wiring route of the cable-side optical fiber 7 and the optical fiber 5 will be described. FIG. 2 (a)
As shown in FIG.
The cable-side optical fiber 7 pulled out from the terminal of the optical cable 3 introduced into the optical fiber 3 is drawn into the intended termination portion 2, and extends on the partition plate 14 from the rear side to the front side via the clamp 15. To the front of the use case 8. This cable-side optical fiber 7 is distributed and wired for each intended optical fiber case 8,
And reaches the rear of the optical fiber case 8, and is introduced into the optical fiber case 8 through an outlet 8f opened rearward.

On the other hand, in the optical fiber case 8,
The optical fiber 5 connected to the cable-side optical fiber 7 by a connector 11 at the connection portion 11 is led out of the optical fiber case 8 through the outlet 8f, and is passed over the partition plate 14 from the rear side of the optical fiber case 8 to the front. It extends further forward through the clamp 16, extends rightward through the clamps 17 and 18, and is led out of the frame 1 through the optical fiber fixing portion 6.

The optical fibers 7 and 5 each have a single-core or multi-core optical fiber core, an optical cord, an optical fiber core exiting from an optical cable terminal, and a tube coated with an optical connector at the tip end. Is adopted. As the optical connectors at the ends of the optical fibers 7 and 5 connected to each other in the optical fiber case 8, JIS C5981 is used.
MT type optical connector (Mecanicall
y Transferable) is adopted.

Next, the operation of the optical distribution board according to the present embodiment will be described with reference to FIGS. 5 to 10 by taking as an example the case where the optical fibers 7 and 5 in the optical fiber case 8 are switched and connected. As shown in FIG. 5 and FIG.
0 in front of the optical fiber case 8 (in the direction of the arrow in the figure)
When a force is applied to the optical fiber case 8, the optical fiber case 8 moves on the moving rail 12 along the front-rear direction, which is the direction in which the optical fiber case 8 is disposed, so that most of the optical fiber case 8 is pulled out of the frame 1. State. The position of the optical fiber case 8 in the pulled-out state is referred to as a front drawing position 21.

When the optical fiber case 8 is pulled out, an outlet 8f through which the optical fibers 7 and 5 pass is provided.
Although it is located forward of the rearmost clamp 16, in the optical fiber case 8, since the outlet 8 f is opened rearward, the optical fibers 7, No excessive bending stress is applied to 5, and a bending radius that does not affect optical characteristics can be reliably ensured. Optical fiber case 8
Since the outlet 8f is formed at the rear of the upper edge 8e, when the optical fiber case 8 is pulled out, the change in the separation distance between the outlet 8f and the clamp 16 is made small, and When the case 8 is pulled out, it is possible to prevent an excessive force from being applied to the optical fibers 7 and 5.

Next, as shown in FIGS. 7 and 8, the optical fiber case 8 in a substantially vertical state is tilted by rotating the optical fiber case 8 with the rotation shaft 13 along the upper edge 8e at the pull-out position 21. At this time, the inclination angle of the optical fiber case 8 is not particularly limited and may be arbitrary. However, it is not necessary to incline the optical fiber case 8 until it becomes horizontal, and the inclination angle may be less than 90 °. This inclination angle can be, for example, 45 to 80 °. FIG. 8 shows the optical fiber case 8 in a state where the optical fiber is inclined so that the inclination angle becomes about 70 °. By making the inclination angle less than 90 °, the twist applied to the optical fibers 7 and 5 when the optical fiber case 8 is inclined can be reduced.

Next, as shown in FIG. 9, the lid 8d of the optical fiber case 8 in an inclined state is opened, the optical fibers 7, 5 inside the optical fiber case 8 are taken out, and switching connection is performed as appropriate. After the connection work is completed, the excess length of the optical fibers 7 and 5 is stored in the optical fiber case 8 in a state where a bending radius that does not affect the optical characteristics is secured, the lid 8d is closed, and the optical fiber After returning the case 8 to the vertical state indicated by the two-dot chain line, the case 8 is moved rearward along the moving rail 12 to the storage position 20 and stored in the frame 1.

At the time of the connection operation, the optical fiber case 8 in the inclined state is moved to the optical fiber case holding mechanism 26.
It is preferable to maintain the inclined state. That is, as shown in FIGS. 10 (a) to 10 (c), an optical fiber case holding plate 25 which has been previously inclined at a desired inclination angle is superimposed on the lower surface side of the optical fiber case 8, and Case 8 is held in an inclined state. Thereby, the inclined state of the optical fiber case 8 can be reliably maintained, and the operation of connecting the optical fiber can be facilitated.

In the optical distribution board of the present embodiment, the support mechanism 10
Is a movable rail 12 capable of moving the optical fiber case 8 to the draw-out position 21 while maintaining the posture at the time of storage.
When the optical fiber case 8 is pulled out, the optical fiber case 8 can be moved forward while maintaining the posture. For this reason, compared to the conventional optical distribution board of the type in which the optical fiber case is pulled out by rotating the optical fiber case, the twist is not applied to the optical fibers 7 and 5 when the optical fiber case is pulled out. It is possible to prevent the transmission characteristics from deteriorating due to the twist. In addition, since the operation of pulling out and storing the optical fiber case 8 with respect to the frame 1 can be performed while maintaining the posture of the optical fiber case 8, the optical fiber case 8 can be compared with the conventional optical distribution board. Vibration and the like during the pull-out operation of the optical fiber can be suppressed low, and the adverse effect on the optical fiber in the live state in the other optical fiber case 8 can be prevented.

Further, the optical distribution board of the present embodiment can tilt the optical fiber case 8 drawn out to the draw-out position 21 along the moving rail 12 at an arbitrary angle with the rotation shaft 13. With this configuration, the optical fiber case 8 can be inclined at a desired angle. For this reason, by making the inclination angle of the optical fiber case 8 small, for example, less than 90 °, the twist applied to the optical fibers 7 and 5 when the optical fiber case 8 is inclined can be made small. it can. Therefore,
As compared with the conventional optical distribution board in which the connection operation is performed with the optical fiber case being placed horizontally on the support bar, deterioration of the transmission characteristics of the optical fibers 7 and 5 due to the twist can be minimized. .

In recent years, an optical CATS switch is often used for optical fiber switch connection. By using the optical CATS switch, the optical connector at the tip of the optical fiber in the live state can be instantaneously moved to the optical connector to be switched to perform switching, so that the adverse effect on the optical fiber line in the live state is minimized. There is an advantage that it can be minimized. For this reason, it is expected to be used when switching and switching optical connectors between two working optical fiber lines having a connection portion. When switching connection of an optical fiber is performed using an optical CATS switch, it is necessary to take out the connection portion of the optical fiber from the optical fiber case and set it in the optical CATS switch. However, the optical fiber including the connection portion is taken out of the case and the optical CA
When performing the work of setting in the TS switch, it is necessary to move the optical fiber for a relatively long distance, so that there is a problem that the optical fiber is easily twisted. On the other hand, according to the optical distribution board of the present embodiment, as described above, the twist applied to the optical fiber can be minimized. An adverse effect on the transmission characteristics of the fiber can be prevented.

Since the supporting mechanism 10 can be pulled out and stored in the frame 1 in a state where the optical fiber case 8 is hung, the optical fiber case 8 can be pulled out or stored. 8
Keeps a substantially vertical state by its own weight unless an external force in the direction of turning around the turning shaft 13 is applied. Therefore, when the optical fiber case 8 is tilted by its own weight during the drawing or storing operation, it is possible to prevent the optical fibers 7, 5 from being erroneously twisted or vibrated.

Further, since the movable rail 12 is provided so as to extend in the front-rear direction, which is the direction in which the optical fiber case 8 is provided, the optical fiber case 8 is pulled out or stored. It is possible to minimize the space required for the use case 8 to move, effectively use the space in the frame 1, and reduce the size of the device.

[0031]

As described above, in the optical distribution board according to the present invention, the supporting mechanism for supporting the optical fiber case with respect to the frame so as to be able to be pulled out and stored in the frame is provided when the optical fiber case is stored. It is equipped with a movable rail that can move to the pull-out position while maintaining the position, and a rotation axis that tilts the drawn-out optical fiber case at an arbitrary angle. The user case can be moved forward while maintaining the posture. For this reason, no twist is added to the optical fiber at the time of drawing, and deterioration of the transmission characteristics can be prevented. In addition, it is possible to suppress vibration and the like during the pulling operation to a low level, and to prevent an adverse effect on the optical fiber in a live state in another optical fiber case. Further, since the optical wiring board of the present invention is configured so that the drawn-out optical fiber case can be inclined at an arbitrary angle with the rotation axis, by reducing the inclination angle,
The twist applied to the optical fiber when the optical fiber case is inclined can be reduced. Therefore, it is possible to minimize the deterioration of the transmission characteristics of the optical fiber due to the twist.

In addition, the supporting mechanism is constructed so that it can be pulled out and stored in the frame while the optical fiber case is suspended, so that the optical fiber case is tilted by its own weight during the drawing or storing operation. This can prevent an excessive twist or vibration from being applied to the optical fiber by mistake.

By providing the moving rail so as to extend along the direction of disposing the optical fiber case,
The space required for the optical fiber case to move when the optical fiber case is pulled out or stored can be minimized, the space in the frame can be effectively used, and the device can be downsized.

[Brief description of the drawings]

FIG. 1 is a front view of an embodiment of an optical wiring board of the present invention.

FIGS. 2A and 2B are diagrams showing a main part of the optical wiring board shown in FIG. 1, wherein FIG. 2A is a plan view, FIG.
(C) shows a side view.

FIG. 3 is a perspective view showing an internal structure of the optical fiber case.

FIG. 4A is a side view showing an optical fiber case holding mechanism, and FIG. 4B is a front view showing the optical fiber case holding mechanism.

FIG. 5 is an explanatory view showing an operation of an optical fiber case used in the optical distribution board shown in FIG. 1;

FIG. 6 is an explanatory view showing the operation of an optical fiber case used in the optical distribution board shown in FIG. 1;

FIG. 7 is an explanatory view showing an operation of an optical fiber case used in the optical distribution board shown in FIG. 1;

FIG. 8 is an explanatory view showing an operation of an optical fiber case used in the optical distribution board shown in FIG. 1;

FIG. 9 is an explanatory view showing an operation of an optical fiber case used in the optical distribution board shown in FIG. 1;

FIG. 10 is an explanatory view showing the operation of an optical fiber case holding mechanism used in the optical distribution board shown in FIG. 1;

FIG. 11 is a front view showing an example of a conventional optical wiring board.

12 is a diagram showing a main part of the optical wiring board shown in FIG. 11, (a) showing a plan view, and (b) showing a front view.

FIG. 13 is a perspective view showing a main part of the optical wiring board shown in FIG. 11;

14 is a perspective view showing the internal structure of the optical fiber case of the optical distribution board shown in FIG.

FIG. 15 is an explanatory view showing the operation of the optical fiber case of the optical distribution board shown in FIG. 11;

FIG. 16 is an explanatory view showing the operation of the optical fiber case of the optical distribution board shown in FIG. 11;

[Explanation of symbols]

1 ... frame, 3 ... optical cable, 5 ... optical fiber,
7 ... Cable side optical fiber, 8 ... Optical fiber case, 10 ... Support mechanism, 11 ... Connection part, 12 ... Movement rail, 13 ... Rotating axis, 20 ...・ Storage position, 21 ... Drawer position

Continuation of the front page (72) Inventor Yoshikazu Nomura 1440 Mutsuzaki, Sakura-shi, Chiba F-term in Fujikura Sakura Works (reference) 2H038 CA37 CA38

Claims (3)

[Claims] An optical fiber case (8) for accommodating a connection portion (11) in which a cable side optical fiber (7) on an optical cable (3) side and another optical fiber (5) are switchably connected. A frame (1) for accommodating the optical fiber case so that the optical fiber case can be pulled out, and a support mechanism (10) for supporting the optical fiber case with respect to the frame so that the optical fiber case can be pulled out and accommodated in the frame. The optical fiber case extends from the storage position (20) where the optical fiber case is stored to the pull-out position (21) outside the frame, so that the optical fiber case can be moved to the pull-out position while maintaining the stored state. A moving rail (12) and a rotating shaft (13) provided along the moving rail and tilting the optical fiber case drawn out to the drawn-out position at an arbitrary angle. Optical wiring board, characterized in that it comprises a. 2. The optical wiring board according to claim 1, wherein the support mechanism is configured to be able to be pulled out and housed in a frame in a state where the optical fiber case is suspended. 3. The optical distribution board according to claim 1, wherein the moving rail is provided so as to extend along a direction in which the optical fiber case is provided.