JPS5919914A - Enclosing device of excessive part of length for optical fiber - Google Patents

Abstract

PURPOSE:To increase the degree of freedom of an excessive part of length and to arrange and sectionalize an excessive-length optical fiber easily by looping the excessive-length part of the optical fiber to a radius greater than the permissible bending radius of the optical fiber, and sandwiching the looped part between sheet members. CONSTITUTION:Optical fiber cables 11 and 12 are fixed in a connection box 60 by cable saddles 71 and 72 and their cable terminals are treated to obtain lead optical fibers 21 and 22, which are connected together. Then, this connection part and fiber excessive-length part 23 are looped to the radius greater than the permissible bending radius and enclosed in a bag-shaped plastic sheet 40, which is fixed to the connection box 60 with screws 50. Consequently, the connection part 30 and excessive-length part 23 of the optical fibers never project to be caught between a lid and the connection box 60, and even when plural optical fibers are connected, excessive-length parts are enclosed independently corresponding to respective connection points, facilitating maintenance.

Description

DETAILED DESCRIPTION OF THE INVENTION [al] Background of the Invention The present invention relates to an original fiber connection accommodation structure, and more particularly to a device for accommodating, fixing, and arranging connections and extra lengths in an optical fiber connection box/connection sleeve VC. .

[BL Prior Art] In the conventional fiber cross-containing structure, all fiber holters are arranged on a track whose radius is greater than or equal to the allowable bending radius of the fiber, and the excess length is accommodated in this holder.

In this method, since the holder cannot be increased by 9 mm, the degree of freedom in determining the length of the fiber is advantageous.When connecting P+, the fiber length is 7 mm? The drawback was that it had to be discarded.

Furthermore, when the number of connections increases, the extra length of each connection gets mixed up in the holder, making it difficult to organize and identify all the fibers, which is a maintenance disadvantage.

(C1 Purpose of the Invention Not Invented) The purpose of the invention is to increase the degree of freedom r in the length of the surplus length in connecting the original fibers and accommodating the surplus length, and to provide surplus length fibers corresponding to each connection point even when the number of connections increases. It is easy to organize and categorize.

(Constitution of the Invention) The present invention increases the degree of freedom in determining the length of the excess length by placing the optical fiber connection portion and the extra length, or only the extra length, in a bag made of a plastic sheet, and also accommodates the close reading point of the pond. By putting each extra length t in a separate plastic sheet bag, it is easy to identify the fiber.Furthermore, mechanically, if the allowable bending radius of the fiber is called the full radius, the plastic sheet has a curvature that is greater than the allowable bending radius. If the cylinder 1) is made with a hole just large enough to fit into it, the permissible bending radius can be secured by inserting the cylinder into the seater cylinder.

(e) Examples of the invention and its effects Figures 1 and 2 show examples of the invention? show. The explanation will be given below according to the figures. Figure 1 shows the present invention in an optical fiber connection box? Show all examples of application. In this figure, the lid of the junction box is not shown in 2.11. ] 2 is a single-core optical fiber cable, which is fixed to the junction box 60 by cable saddles 71 and 72. In this figure, the optical cables are terminated in the junction box and optical fibers 21 and 22 are exposed. 4o
is a plastic sheet according to the present invention, which is made of translucent sheets such as nylon 6, which are folded into two, and a portion of both ends are fixed by thermocompression bonding to form a bag shape. (The thermocompression bonded part is indicated by the X mark in the figure) Now, connect the exposed original fiber 21.22t",
The connecting portion (aO) is looped together with the V fiber extra length (23) at a radius less than the allowable bending radius, and housed in a plastic sheet (40). Finally, use the screw (50) to connect to the Sea H-junction box, and close the lid of the junction box to finish the work■ What is in Figure 2? ! Cable with several fibers (4 cores in the diagram)
Gold is shown in case of mutual connection. In this figure, the same parts as in FIG. 1 are given the same numbers. Even if there are 8 optical fibers in the example shown in the figure, the optical fibers t-1 are connected one by one and housed in a plastic sheet in the same way as in FIG.

According to one embodiment of the present invention, since the connecting portion and the extra length of the optical fiber are all housed in the bag-like plastic sheet, there is no risk of the optical fiber sticking out and getting stuck between the lid and the connecting box, and the optical fiber is Even in the case of 11C, maintenance is easy because the extra length is accommodated independently corresponding to each connection point.

Furthermore, since the loop diameter of the extra length within the plastic sheet can be fully compressed, the degree of freedom regarding the length of the extra length is greatly improved, and even in the case of reconnection, the extra length can be used for one turn. There is an effect that this problem can be easily dealt with by slightly reducing the loop diameter without truncation.

By the way, in this case, there is a concern that the curvature will be less than the allowable bending radius after being stored in the excess length plus snack sheet due to some reason, but in reality, the original cable is connected by the saddle as shown in Figure 1. Since it is fixed to the box, there is little risk of external force being applied to the optical fiber, and if the loop radius of the accommodated extra length is at least 4 times the total allowable bending radius, the loop diameter can be adjusted due to the rigidity of the optical fiber itself. In reality, it is difficult for the bending radius to be less than the allowable bending radius.

(fl Modifications/Applications of the Invention Fig. 3 shows plasti, yxsheets? This is an example of an application that is simply folded in two. Even something that is not completely bag-shaped like this can have a sufficient effect t''.

Figure 84 is an example of an application in which a hole is made in a plastic sheet and inserted into a cylindrical (go)t'' sheet with a curvature t- greater than the allowable bending radius. By accommodating the feldspar with a sufficient distance from the column on the extra length, the degree of freedom of the feldspar with the extra length p does not decrease in the slightest.

FIG. 5 shows an application example in which the original fiber connection part (AO) is brought out of the plastic sheet, and the rest is the same as the embodiment shown in FIG. 1. In this application example, all connected parts are easily identified and removed, making maintenance, inspection, and reconnection very easy. (90) is the connection holder
shows.

Figures 6 and 7 show the plastic sheet t-Is there a way to attach it to the junction box using a method other than mounting? show.

In the embodiment shown in FIG. 6, the cushion material (101) is made of rubber or the like.
How to completely fix the sheet with something attached to hardware (100),
Figure 7 shows a cylinder (80) with a curvature less than the allowable bending radius.
Cut a screw at the tip of the cushion material (101) and attach the nut (102) to fix the seat. In each of these embodiments, the number of sheets is one, and it goes without saying that the number of sheets may be multiple.

Effects of the Invention According to the present invention, the optical fibers whose connecting portions and extra lengths are housed in a bag-like plastic sheet can be easily arranged without protruding, and the connecting portions and the corresponding extra lengths vi
- Because it is put in a bag as a set, even if multiple optical fibers are connected, they can be organized and divided, making maintenance easier. Since the extra-length loops accommodated in the plastic sheet can be set extremely continuously, there is an effect that the freedom of the extra-length feldspar is not significantly improved.

[Brief explanation of the drawing]

1 and 2 show a simple embodiment of the present invention. 3 and 4 are other embodiments of the present invention? show. FIG. 5 shows another glass sheet according to the present invention! l! An example is shown. 6 and 7 show another embodiment of the sheet fixing method. In the figure, 11.12 is an optical cable, 21.22 is an original fiber, 23 is an extra length of fiber, 30 is a connection part, 40 is a plastic sheet according to the present invention, 80 is a cylinder whose curvature is more than the allowable bending height, 103 Is it a RL deciding bin? Each is shown below.

Claims (1)

[Claims] +11 Optical fiber extra length r1 The permissible curve of the original fiber is shaped into a ring shape with a radius greater than the radius, and the shaping portion? An optical fiber characterized by being inserted into a notebook component.
Excess length storage device. (2) Provide a circular hole with a radius greater than the allowable bending radius of the optical fiber in the sheet member VC, arrange the extra length of the optical fiber outside the circumference of the hole, and set the allowable bending radius of the optical fiber. or more radius? φ, and a radius equal to or smaller than the radius of the hole f5' provided in the hole? Claim 1 (1) characterized in that the sheet-like member is inserted into a cylinder having a
) The optical fiber surplus length accommodation device described in item 2.