JPH10239533A - Excess length treating structure of optical fiber cord - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an excess length treating structure of an optical fiber cord that protects the optical fiber cord and also that can perform work such as inspection easily. SOLUTION: A protecting plate for protecting an optical fiber cord 7 from an electric signal cable connected with an electric signal terminal 3 is divided into a fixed plate 8 and a movable plate 9. The fixed plate 8 is disposed between an electric signal cable introducing part to the electric signal output terminal 3 and an excess length part 7a. While, the movable plate 8 is disposed among an introducing part for introducing the excess length part 7a to an optical signal input terminal 4 and an introducing part for introducing the optical fiber code 7 to the excess length part 7a from the outside and the electric signal output terminal 3 side and the optical fiber code 7 is covered from the electric signal output terminal 3 side in closed condition. The movable plate 9 is substantially circle shape and a center shaft 8a attached to the fixed plate 8 is disposed in its part and the plate can turn around it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for processing extra length of an optical fiber cord.

[0002]

2. Description of the Related Art In recent years, with the spread of high-speed, high-bandwidth communication services, introduction of communication services, such as optical cable television (CATV), for connecting all homes and transmitting stations with optical fiber cords has begun. To realize this communication service, an optical / electrical signal converter (O / E converter) for splitting a signal from an optical fiber cord to a subscriber is required. The configuration of this opto-electrical signal conversion device is roughly divided into an electronic circuit unit for converting an optical signal into an electric signal, and an extra length processing structure of an optical fiber cord adjacent to the electronic circuit unit.

[0003] By providing an extra length in the optical fiber cord, it is possible to directly cope with a connection change or the like that extends the optical fiber cord. In addition, if a low-loss connection cannot be obtained during the connection work of the optical fiber, the connection end can be cut and restarted, and even if the optical fiber cord is damaged due to maintenance work or the like, the damaged portion can be cut and reconnected. It becomes possible. If the optical fiber cord is bent too much, the transmission characteristics are deteriorated, and in an extreme case, the optical fiber cord is broken. Therefore, the extra length of the optical fiber cord is stored in the extra length processing structure so as to maintain a predetermined bending radius.

In order to prevent the optical fiber cord from being damaged by the work of attaching and detaching the electric signal output cable, etc., a space between the extra length processing structure of the optical fiber cord and the electric signal output cable and the power cord passing through the extra length processing structure is provided. Is provided with a partition plate. The opto-electrical signal converter is periodically inspected to test whether the optical signal is being transmitted at the required level. In order to connect the optical connector to a measuring instrument and check whether the optical signal is transmitted at a required level, it is necessary to disconnect the optical connector from the optical signal input terminal.

FIG. 5 is a plan view of a partial structure of a conventional photoelectric conversion device. FIG. 5A is a first conventional example, and FIG.
(B) is a second conventional example. In the figure, 1 is a surplus processing structure portion, 1a is a fixed claw portion, 1b is a left side plate portion, 1c is a back plate portion,
1d is a right side plate portion, 2 is a housing portion, 3 is an electric signal output terminal,
4 is an optical signal input terminal, 5 is a power cord, 6 is an optical connector, 7 is an optical fiber cord, 7a is an extra length, 11 is a fixed partition, and 21 is a fixed partition.

In a first conventional example shown in FIG. 5 (a), a coaxial cable (not shown) and a drawn-out portion of a power cord 5 and an optical fiber cord 7 are fixed to a fixed partition plate 11 in a surplus processing structure 1. Is fixedly partitioned by.
The extra length processing structure 1 is provided to extend from the rear panel of the housing 2 and includes a left side plate 1b, a back plate 1c, and a right side plate 1d.
It is a structure that is surrounded by and has a bottom and an open top. Case 2
An electric signal output terminal 3 and an optical signal input terminal 4 are provided on the rear panel at different mounting heights, and the power cord 5 is pulled out at substantially the same height as the electric signal output terminal 3. I have. The electrical signal output terminal 3 and the optical signal input terminal 4 are respectively connected to a connector of a coaxial cable (not shown) and an optical connector 6 of an optical fiber cord 7 from below in the figure.

[0007] The fixed partitioning plate 11 extends above and below the extra-length processing structure 1 by a distance of 2 mm except within a predetermined range from the rear panel of the housing 2.
It is fixed integrally with the left side plate portion 1b, the back plate portion 1c, and the right side plate portion 1d by a fixing claw portion 1a provided on a support standing upright on the bottom plate of the excess length processing structure portion 1. . A surplus portion 7 is provided between the bottom plate of the surplus processing structure 1 and the fixed partition plate 11.
a is bundled and stored in a ring shape so that a does not become smaller than a predetermined bending radius, and is set as a surplus length processing section.

[0008] A second conventional example shown in FIG.
This uses a fixed partition plate 21 lacking the right portion of the fixed partition plate 11 shown in FIG. Optical fiber cord 7
However, it is also exposed from the outside at the introduction portion to the extra length portion 7a and at the introduction portion from the extra length portion 7a to the optical connector 6.

In the first conventional example shown in FIG.
The optical fiber cord 7 is protected from the coaxial cable and the power cord 5 by the two fixed partition plates 11, and the fixed partition plate 1
1 looks like a complete protective wall. However, it is necessary to remove the fixed partition plate 11 when detaching and attaching the optical connector 6 during the above-mentioned inspection work. In addition, the connected coaxial cable and the power cord 5 become obstacles, and it is difficult to attach and detach the fixed partition plate 11, which causes not only a problem of poor workability but also a cause of damage to the optical fiber cord 7.

On the other hand, in the second conventional example shown in FIG. 5B, the optical connector 6 can be attached and detached without removing the fixed partition plate 21. However, since a part of the optical fiber cord 7 is exposed, the optical fiber cord 7 is not completely protected. When installing the optical / electrical signal conversion device, the optical fiber cable
Contact and damage.

[0011]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and is intended to protect an optical fiber cord and to make it possible to easily carry out operations such as periodic inspections. It is intended to provide a structure.

[0012]

According to the first aspect of the present invention, an optical fiber cord connected to the optical signal terminal is connected to a device having a height difference between an optical signal terminal position and an electric signal terminal position. An extra-length processing structure for storing an extra length, and an extra-length processing structure of an optical fiber cord having a protective plate for partitioning the electrical signal terminal side, the optical signal terminal, and the extra-length processing unit side, wherein the protective plate Has a fixed plate and a movable opening and closing plate,
The movable opening / closing plate is provided between the electric signal terminal side and an introduction portion of the optical fiber cord to the optical signal terminal. Therefore, while protecting the optical fiber cord, the work of attaching and detaching the optical fiber cord to the optical signal terminal can be easily performed only by rotating the movable plate without removing the protection plate, and the minimum exposure state of the optical fiber cord can be achieved. Inspection work becomes possible.

According to a second aspect of the present invention, in the structure for processing an excess length of an optical fiber cord according to the first aspect,
The movable opening / closing plate is substantially fan-shaped, and is attached to the fixed plate so as to be rotatable around the main part of the fan. Therefore, the open area of the protection plate can be increased with a simple mechanism.

According to a third aspect of the present invention, in the excess length processing structure of the optical fiber cord according to the first or second aspect, at least one of the fixed plate and the movable opening / closing plate is provided at at least two places. An engaging hole is provided, and the other of the fixed plate and the movable opening / closing plate has one locking protrusion, and the movable member is formed by engagement of the locking hole and the locking protrusion in one place. The rotation of the opening / closing plate is prevented. Therefore, even if the extra-length processing structure is inclined during or after the inspection work, the movement of the movable plate is restricted by the engagement of the engagement holes with the locking projections. There is no danger of damaging the optical fiber cord due to a sudden movement.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 and 2 are partial structural views of an optical / electrical signal conversion device using an optical fiber cord extra length processing structure according to an embodiment of the present invention. 1 is a plan view, FIG. 1 (b) is a cross-sectional view taken along the broken line AA in FIG. 1 (a), FIG. 2 (a) is a rear view, and FIG. 2 (b) is a right side view. . In the figure, the same parts as those in FIG. 1e is a fixed plate support, 1f is a movable plate support, 1g is a fixed plate support column, 8 is a fixed plate, 8a
Is a central axis, 8b and 8c are fixed claws, 9 is a movable plate, and 9a is a handle.

As shown in FIGS. 1B and 2B, this embodiment employs an optical signal input terminal 4 similar to the prior art.
There is a height difference between the position of the optical signal cord 3 and the position of the electric signal output terminal 3, and a surplus processing section for storing the extra length 7 a of the optical fiber cord 7, the electric signal output terminal 3 side, the optical signal input terminal 4, This is a surplus length processing structure of the optical fiber cord 7 having a protection plate which separates the optical fiber cord 7 from the long processing unit side and protects the optical fiber cord 7 from an electric signal cable.

As shown in FIG. 1A, in this embodiment, the above-mentioned protection plate is divided into a fixed plate 8 and a movable plate 9. The fixing plate 8 is provided between an introduction portion for introducing the electric signal cable to the electric signal output terminal 3 and the extra length portion 7a. On the other hand, the movable plate 9 is provided with the extra length 7 of the optical fiber cord 7.
an introduction part for introducing a into the optical signal input terminal 4 and an introduction part for introducing the optical fiber cord 7 from the outside to the extra length part 7a;
It is provided between the electric signal output terminal 3 side and covers the optical fiber cord 7 from the electric signal output terminal 3 side in the closed state shown in the figure. While the fixed plate 8 is substantially rectangular, the movable plate 9 is substantially fan-shaped, and has a fan-shaped main part on the side of the introduction section from outside, and a center attached to the fixed plate 8 at this main part. There is a shaft 8a, around which it can rotate. The handle 9a serves as a knob when the operator rotates the movable plate 9. In the illustrated example, the outlet of the power cord 5 is located on a substantially extended portion of a portion where the fixed plate 8 and the movable plate 9 always overlap.

As shown in FIG. 1B, the fixed plate 8 is a fixed plate support 1 inside the left side plate 1b of the excess length processing structure 1.
e, and is fixed by a fixed plate support column 1g erected from the bottom plate of the extra length processing structure 1 and a fixed claw portion 1a provided on a similar support column. As shown in FIG.
The back plate portion 1c of the extra length processing structure portion 1 is supported by fixing claw portions 8b and 8c in insertion holes provided here. On the other hand, the movable plate 9 is attached to the fixed plate 8 with the central axis 8a, and is also supported by the movable plate support 1f provided inside the right side plate 1d of the excess length processing structure 1.

The detailed structure of the fixed plate 8 and the movable plate 9 and the movement of the movable plate 9 will be described with reference to FIGS. FIG. 3 is an explanatory view of a normal state of the movable plate. 3A is a plan view, FIG. 3B is a right side view, and FIG. 3C is a front view. In the figure, the same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals, and description thereof will be omitted. 8d is a protruding edge portion, 8e is a claw receiving portion,
8f is a locking projection, 8g is a guide, 8h is a hole, 9b is a slit, 9c is a locking hole, 9d is a locking hole, and 9e is an embossed portion.

The claw receiving portion 8e of the fixed plate 8 is a portion that engages with the fixed claw portion 1a shown in FIG. 1, and has protruding edges 8d on both sides thereof. The movable plate 9 is provided with an arc-shaped slit 9b, through which a guide 8g cut and raised from the fixed plate 8 and bent is guided to rotate without the movable plate 9 coming off. The center shaft 8a is formed, for example, by making a small hole in the movable plate 9, fitting the burring portion of the small hole made in the fixed plate 8 and crushing it from above. Alternatively, a shaft member is inserted into the small holes of the movable plate 9 and the fixed plate 8,
You may swage. In a normal state, the movable plate 9 closes on the optical fiber cord to the optical signal input terminal 4. At this time, the locking projection 8f of the fixed plate 8 is
c to prevent the movable plate 9 from rotating. An embossed portion 9e is provided at an end of the slit 9b.

FIG. 4 is an explanatory view of a state where the movable plate is stored in the fixed plate. 4A is a plan view, FIG. 4B is a right side view, and FIG. 4C is a front view. In the figure, the same parts as those in FIG. 3 are denoted by the same reference numerals, and description thereof will be omitted. When attaching and detaching the optical connector, the movable plate 9 is rotated counterclockwise as shown in the figure to overlap the upper surface of the fixed plate 8. At this time, the locking projection 8f is locked in the locking hole 9d this time so that the movable plate 9 does not rotate carelessly. In this manner, one locking projection 8f provided on the fixed plate is engaged with two engagement holes 9c and 9d provided on the movable plate 9. When the movable plate 9 is locked in a half-open state, the movable plate 9 may be further provided with an engagement hole. The locking members that can prevent the rotation include the above-described engaging holes 9c and 9d and the locking protrusion 8f.
The movable plate 9 is provided with an engagement hole on the fixed plate 8 side.
It is also possible to use a locking projection provided on the side facing downward.

Returning to FIG. 1 and FIG. 2, the operation at the time of inspection of the photoelectric conversion device will be described. At the time of periodic inspection of the photoelectric conversion device, the movable plate 9 is rotated and housed in the fixed plate 8 side to open the excess length processing unit. As a result, the optical fiber cord 7 at the introduction portion from the extra length portion 7a connected to the optical connector 6 is exposed, so that the optical connector 6 is detached from the optical signal input terminal 4 and the optical output test is performed. After the test is completed, the optical connector 6 is connected to the optical signal input terminal 4 again, and the movable plate 9 is rotated and closed again, so that the optical fiber cord 7 is covered with the movable plate 9 and protected. In the illustrated example, the optical fiber cord 7 of the introduction portion to the extra length portion 7a is also exposed from the outside. However, from the extra length 7a, the optical connector 6
If the optical fiber cord 7 at the introduction portion to the optical fiber is exposed at least, the detachment of the optical connector 6 becomes easy.

In the above description, the movable plate 9 has a substantially fan shape, but the shape is not particularly limited. For example, it may be rectangular. In the case of adopting a rectangular shape, it is preferable that the movable plate is slid in the direction of the fixed plate 8 to open and close. Further, the fixed plate 8 and the movable plate 9 do not necessarily need to be connected by the center axis 8a or the like. For example, the movable plate 9 rotates around an axis erected on the bottom plate of the excess length processing structure. You may do so.

In the above description, the structure for processing the extra length of the optical fiber cord in the optical / electrical signal converter has been described. However, the present invention is not limited to the optical / electrical signal converter, but any device having an optical signal terminal and an electrical signal terminal can be used. The present invention can be applied to a surplus length processing structure of an optical fiber cord connected to the optical signal terminal. For example, the present invention is also applied to a case where a surplus processing structure is provided in an electro-optical signal conversion device (O / E conversion device), a data transmission device having an input signal system or an output signal system having two systems of an optical signal and an electric signal, or the like. be able to.

[0025]

As is clear from the above description, according to the present invention, the optical fiber cord 7 is not damaged at all times by the protective plate, and the protective plate is partially opened at the time of inspection to prevent the optical fiber cord 7 from being damaged. There is an effect that the attachment / detachment work of the connector 6 can be easily performed, and the inspection work can be easily performed.

[Brief description of the drawings]

FIG. 1 is a partial structural view of an optical / electrical signal conversion device using an optical fiber cord extra length processing structure according to an embodiment of the present invention. FIG. 1 (a) is a plan view, and FIG. FIG. 2 is a cross-sectional view taken along the line AA shown in FIG.

FIGS. 2A and 2B are partial structural views of an optical / electrical signal conversion device using an optical fiber cord extra length processing structure according to an embodiment of the present invention; FIG. 2A is a rear view, and FIG. It is a right side view.

FIG. 3 is an explanatory diagram of a normal state of a movable plate.

FIG. 4 is an explanatory diagram of a state in which a movable plate is stored in a fixed plate.

FIG. 5 is a plan view of a partial structure of a conventional photoelectric conversion device, wherein FIG. 5A is a first conventional example, and FIG.
This is a conventional example.

[Explanation of symbols]

1 Extra length processing structure section, 1a fixed claw section, 1e fixed plate support section, 1f movable plate support section, 1g fixed plate support column, 2
Housing, 3 electrical signal output terminals, 4 optical signal input terminals,
5 power cord, 6 optical connector, 7 optical fiber cord, 7a extra length, 8 fixing plate, 8a central axis, 8e
Claw receiving portion, 8f locking projection, 8g guide, 9 movable plate, 9a handle, 9b slit, 9c locking hole, 9d
Lock hole

Claims (3)

[Claims] An extra length processing unit for storing an extra length of an optical fiber cord connected to the optical signal terminal for a device having a height difference between an optical signal terminal position and an electric signal terminal position; A surplus length processing structure of an optical fiber cord having a protection plate that partitions a terminal side from the optical signal terminal and the surplus length processing unit side, wherein the protection plate has a fixed plate and a movable opening / closing plate, The extra length processing structure of the optical fiber cord, wherein the plate is provided between the electric signal terminal side and an introduction part of the optical fiber cord to the optical signal terminal. 2. The optical fiber cord according to claim 1, wherein the movable opening / closing plate has a substantially sector shape, and is attached to the fixed plate so as to be rotatable around a main part of the sector shape. Extra length processing structure. 3. One of the fixed plate and the movable opening / closing plate has at least two engagement holes, and the other of the fixed plate and the movable opening / closing plate has one locking projection. 3. The optical fiber cord according to claim 1, wherein the movable opening / closing plate is prevented from rotating by engagement of the engagement hole and the locking projection at one place. Extra length processing structure.