JPS6152606A - Storage structure of optical fiber core wire connecting part - Google Patents

Abstract

PURPOSE:To improve the storage density of a core wire connecting part of an optical fiber, and a surplus length core wire, and to maintain a good transmission characteristic by laminating a surplus processing sheet provided with a bend part by turning upward two opposed sides of a rectangular plastic sheet and bending them plural times, and a sheet of a structure whose side length is different from said sheet. CONSTITUTION:In a flat part and a bend part 10 of surplus length processing sheets 9a, 9b, a core wire connecting part 6 is placed in the vicinity of a sheet wall 12, and between upper and lower surplus length core wires 5a, 5b, a plastic 11 is inserted, and also the surplus length processing sheet 9a whose side face is short, and the surplus length processing sheet 9b whose side face is long are superposed alternately, by which the titled structue is constituted. In this way, the storage position of the core wire connecting part 6 is dispersed upward and downward, therefore, a height of the whole storage structure can be compressed by an empty weight of each surplus length processing part or a load from the upper part, and the storage density of the optical fiber core wire connecting part can be raised. Accordingly, the core wire is not pinched in the sheet, therefore, a good transmission characteristic can be maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a structure for accommodating an optical fiber connecting portion and an extra length of the optical fiber in a connecting portion of an optical cable.

(Prior Art) Conventionally, the accommodation structure for this type of optical 7-iper fiber connection section consists of strip-shaped sheets of plastic or the like that are alternately turned in a fixed width, as shown in FIGS. 7 and 8. Using the extra length processing sheet 1 configured by folding, insert the extra length fiber 5 of the optical fiber core 4 taken out from the optical cable 8 and its fiber connection part 6 (for example, a connection tube, etc.) into the gap between each sheet piece 2. ). Here, the core wire connection part 6 is fixed by a connection part receiver 8 made of a small piece of plastic sheet or the like attached to the upper surface of the folding part 7.

(Refer to Utility Model Application No. 57-174698.) Therefore, a large number of fiber connectors 6 are stacked at the same vertical position, which increases the height of the entire storage structure and reduces the storage density of the fiber connectors. There were drawbacks. Further, in the folded portion 7 of the sheet, the excess core wire 5 is sandwiched between the sheet 1 and the lateral pressure increases, resulting in deterioration of transmission characteristics.

(Problems to be Solved by the Invention) The object of the present invention is to improve the storage density of the fiber connecting portion and the extra length of the optical fiber, and to maintain good transmission characteristics at all times.

(Means for Solving the Problems) The present invention provides an extra length processing sheet having a structure in which two opposing sides of a rectangular plastic sheet are bent upward multiple times to provide a bent portion over the entire length of the two sides. , opposite 2
Extra length treatment sheets having a structure in which the length of the side without a bent portion is different from the extra length treatment sheets are stacked alternately in the vertical direction. The present invention will be explained in detail below with reference to the drawings.

An embodiment of the invention is shown in FIGS. 1 and 2.

FIG. 1 is a perspective view of this embodiment, and FIG. 2 is a side view. In the figures, the same components as those of the conventional example are designated by the same reference numerals. That is, 3 is an optical cable, 4 is an optical fiber core, 5.5a
, 5b is an extra length of the core wire, and 6 is a core wire connection portion, for example, a connection tube. In addition, 9a is a bent portion 1 in which the long side is bent twice upward.
This is a surplus length processing sheet having a length of 0. Reference numeral 9b is an extra length processing sheet whose side surfaces are longer than those of 9a. 11 are upper and lower extra length core lines 5a, so that the extra length core lines in the full length processing sheet do not intersect;
This is a plastic sheet inserted between 5b. Also 1
2 is a side surface (sheet wall) of the bent portion.

In this embodiment, the fiber connecting portions 6 are disposed close to the sheet wall 12 in the flat portions and bent portions lO of each of the extra length treatment seams h9a, 9b, and the upper and lower extra length core wires 5a are arranged close to the sheet wall 12.

A plastic sheet 11 is inserted between the sheets 5b, and a sheet 9a with a short extra length on the side surface and an extra length sheet 9b with a long side surface are vertically stacked alternately. In this way, since the storage positions of the optical fiber connection parts 6 are distributed vertically, the height of the entire storage structure can be compressed by the weight of each extra length processing part or the load from above. It is possible to increase the storage density of connection parts.

Further, unlike the conventional examples shown in FIGS. 7 and 8, the core wires are not sandwiched between sheets, so that good transmission characteristics can be maintained.

In this example, two types of extra length processing parts with different side lengths are stacked alternately in the vertical direction, but more than eight types of extra length processing parts with different side lengths are stacked in descending order of side length. Even if these units are piled up in an orderly manner to form one unit, it is possible to realize a storage structure for the optical fiber connection portion having the same effect as in this embodiment.

Further, the present invention can be applied even if the optical fiber coated wire 4 of the embodiment shown in FIGS. We will consider the compression effect when a load is applied from above to the storage structure. The thickness of the extra length processing sheets 9a, 9b and plastic sheet 11 is t, the optical fiber core is I! The diameter of 4 is d,
If the height of the core wire connection part 6 is D, then the extra length sheet 9a with short sides due to load etc. is the extra length sheet 9 with long sides.
The maximum permissible value hmax of the amount by which 9b sinks without contacting the extra length center @5 is expressed by the following equation based on FIG. 3, which shows the sinking state.

D(1) hmaX '' T −d Therefore, the maximum value PInax of the compression ratio (ratio of the heights of the storage structure with and without sinking) is expressed by the following equation.

"max (%) = 100 (D-14t-hTnax
) / (D+2t)=100(p+gt+d)/
CD+2t) (2) FIG. 4 shows the results of simulating the relationship between the optical fiber diameter, the height of the fiber connection portion, and Pmax using equation (2). From Figure 4,
It can be seen that the compression effect is large when the height D of the fiber connection portion is large and the optical fiber core diameter d is small. For example, as a core wire, 5-core tape-type high-density core IIA (1.5 in d)
), and the fiber connection part for the flat plate for high-density fibers (
When using a cable (equivalent to 7 bears in D), Pmax is approximately 78% as shown in FIG. 4, and the space for accommodating the core wire can be reduced by approximately 27%.

Next, the results of verifying the effects of the present invention through implementation experiments will be described.

・Figure 5 shows the core processing structure used in the experiment.

(A) is a structural diagram using a conventional folding sheet, (B)
(C) is a structural diagram using box-like sheets of equal width.
is a structural diagram of the present invention. A load was applied vertically to these core processing sections from above, and the mounting height was measured.
As shown in the figure. The implementation conditions are as follows.

Optical fiber tape unit (accommodating 5 fibers at once) Height of fiber connection part 4-1 width 3.5sax, length 50M sheet Width 276 order, depth (A), (B) 140 mm, (G
)+7), we alternated between 140sss and 100.

Wire processing radius of curvature: 4 table units per stage (total 40 stages) As shown in Fig. 6, the fiber storage structure of the present invention is superior to conventional structures or structures using box-like sheets of equal width. It can be seen that the height direction can be compressed by about 15% to 20% under a concentric load, and that high-density packaging of core wires per unit volume can be achieved.

(Effects of the Invention) As explained above, the present invention has the advantage of folding a rectangular plastic sheet multiple times with two opposing sides facing upward.
An extra length processing sheet having a structure in which bent portions are provided over the entire length of the two sides, and an extra length processing sheet having a structure in which the opposite two sides have different lengths of sides without bent portions from the extra length processing sheet. It is characterized by stacking the wires vertically alternately, and the fiber connection parts can be distributed without stacking them in the same position, so the height of the entire storage structure is reduced due to the weight of each excess length processing part or the load from above. can be compressed. Therefore,
This has the advantage that the accommodation density of the optical fiber connection portion can be improved. For example, when accommodating the connecting portion of 5-fiber tape-type high-density core wires, the accommodating space can be reduced by 27%. In addition, since the optical fiber is not pinched by the sea) ffJ, there is an advantage that good transmission characteristics can be maintained.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention, FIG. 2 is a side view of the embodiment of FIG. 1, and FIG. FIG. 4 is a graph showing the high-density storage effect of the structure of FIG. 8, FIG. 5 (A) is a needle perspective view showing the structure of a conventional folding sheet, and FIG. ) is a perspective view showing the structure of a box sheet with equal width, FIG. 5 (0) is a needle perspective view showing the structure of the present invention, FIG. is a perspective view showing a storage structure for a conventional optical fiber connector, and FIG. 8 is an exploded side view of the storage structure shown in FIG. 7. 2...
- Sheet piece, 3... Optical cable, 4... Optical fiber core wire, S, Sa. 5b... Extra length core wire, 6... Core wire connection part, 7... Folding part, 8... Connection part receiver, lO... Bent part, 1
1...Plastic sheet, 1z...Side surface of bent part (sheet wall Figure 5 (A> (B) (C) Figure 6)

Claims (1)

[Claims] 1. An extra length processing sheet having a structure in which two opposing sides of a rectangular plastic sheet are folded upward multiple times to provide a bent portion over the entire length of the two sides and no bent portions on the other two sides; Extra length processing sheets having the same structure as the extra length processing sheet but having a different length of the side without a bent portion from the extra length processing sheet are stacked alternately in the vertical direction. Storage structure for optical fiber connections.