JPS5921372Y2 - Optical fiber surplus length processing bobbin - Google Patents

Description

[Detailed Description of the Invention] Background and Purpose of the Invention An extra length of approximately 1 m is normally expected at the core connection portion of an optical fiber cable.

A bobbin that could handle this extra length with almost no increase in transmission loss was proposed (Japanese Patent Application No. 53-159).
620, Utility Model Application No. 54-014336, etc.).

In this process, a loop is formed using the excess length of the fiber core (see Fig. 4), and the loop is wound around the cylindrical outer surface of the bobbin.

The purpose of this invention is to provide a bobbin for processing extra length of optical fiber, which is convenient for processing each unit at once, especially when connecting unit type optical cables.

Embodiment Mainly shown in FIG. 1, 12 is the main body of the bobbin, which is a cylindrical body made of aluminum or the like.

Flams 14 and 16 are provided at both ends thereof.

Further, in the middle, for example, two pieces 18 and 20 are provided.

The space between the ribs 18 and 20 is used as a core wire connection portion housing portion 22.

Further, the area between the collars 14 and 18 and between the collars 20 and 16 is used as an extra length processing portion 24.

The collars 14 and 16 are provided with a number of grooves 26.

They are, for example, U-shaped, with both sides parallel to the axis.

In addition, its wide cross-sectional area (perpendicular to the axis) accommodates one unit of fiber cores 102 (for example, 6 fibers),
Note that there should be a little margin (Figure 2).

A lid 28 is placed over each groove 26.

The lid 28 is hinged at one end with, for example, a machine screw 30 so that it can be opened and closed.

A wide groove 32 is provided at the middle ends 18 and 20,
One unit of fiber core wires 102, for example, 6 fibers, can be passed through it.

A large number of cord pressers 34 are arranged in a nonng shape inside each of the collars 18 and 20.

For example, as shown in FIG. 3, each core wire presser 34 consists of a sponge pad 38 that is split into two pieces and inserted into a U-shaped metal holder 36, and the fiber core 10 is held at the seam 40 of the sponge pad 38.
It is designed to hold 2.

Note that, for example, two opposing holders 36 are made integrally with an intermediate plate 37 and fixed on the main body 12.

How to use (FIG. 4) In FIG. 4, 100 is an optical fiber cable, 102 is a fiber core, and 104 is a core wire connection part.

In addition, in FIG. 4, the bobbin is shown schematically.

■The fiber core wires 102 for a unit are combined into one
4, put it in the groove 26 of 16 and close the lid 28.

Also, in the middle ribs 18 and 20, one unit of core wires 102 is passed through each groove 32 at once.

As shown in FIGS. 3 and 4, the wire connecting portions 104 are arranged in two or more stages in an overlapping manner between the opposing wire pressers 34.

Then, connect the core wires 102 on both sides of each connection portion 104 to the pads 38.
Insert it into the seam 40.

Note that the height of the pad 38 is set to be approximately equal to the height of the overlapping connection portion 104.

That is, when the cable connecting parts 104 are designed to be stacked in two stages, the height is the same as that of the two stacked connecting parts 104, and when three stages are planned to be stacked, the height is three stages.

By doing this, as shown in FIG.
The core wires 102 on both sides of the core are held in two or more stages in the radial direction within the seam 40 while maintaining a nearly straight state (without being subjected to large bending).

In the extra length processing portion 24, the extra length of the core wire 102 is used to create oval loops 102A inscribed in the ribs 14 and 18, or 20 and 16, respectively.

Then, loop 102A for each unit I.
is placed in, for example, a plastic bag 42, wrapped around the outer surface of the main body 12, and pressed appropriately.

In this way, the core wire 102 cannot be bent locally, so transmission loss hardly increases.

Effects of the invention (1) On the inner sides of the brim at both ends of the connection part accommodating part 22, the core wire pressers 34 holding the pads 38 divided in half are arranged facing each other, and in the seam 40, two or more tiers are arranged. Since the fiber core wires 102 on both sides of the stacked core wire connection portion 104 can be held in two or more stages in the radial direction,
The processing of the core wires 102 that pass through the brim grooves 32 in units can be easily and effortlessly performed as follows.

That is, if the wire presser 34a is such that it can hold only one core wire 102 as shown in FIG. If it is attempted to process the core wire 102 all at once, a large curved portion will be formed in the core wire 102 as shown by an arrow 44 between the groove 32 and the wire presser 34.

The more the core wire 102 is bent, the more the loss increases.

However, in the case of the present invention, as shown in FIG. 5, the bending of the fiber core 102 is much less than in the case of FIG. 6.

(2) Even if two or more rows of core wires 102 are held side by side within the seam 40, as shown in FIG. If the core wire 102 is held in the seam 40 of the wire presser 34a by bending it, the core wire 102 will tend to come off the seam 40 due to its own elasticity.

To prevent this, measures must be taken such as placing a lid on top or gluing the upper end of the seam 40.

Further, the fiber core wire 102 can also be bent. However, in the present invention, the core wires 102 on both sides of the core wire connection portion 104 stacked in two or more stages can be held in two or more stages in the seam 40 while maintaining a nearly straight state. There is no need to worry about the above.

Therefore, to take advantage of the fact that the pads 38 are sandwiched in the seam 40, for example, the core wires 102 on both sides of the two-tiered fiber connection section 104 are simply sandwiched in the seam 40 (especially when connecting 104 to the main body 12), do the same thing to the entire connection section 104, and then wrap tape over all the connection sections 104 all at once to fix them. You can also do it.

Furthermore, it is also possible to easily replace the fiber core 102 with another core wire holder 34 during the process.

(3) Since the fiber connecting portions 104 can be stacked in two or more stages and processed, the number of fiber cores 102 that can be processed with one bobbin increases.

[Brief explanation of the drawing]

1 to 5 relate to an embodiment of this invention, FIG. 1 is a perspective view, and FIG. 2 is a groove 26 in the brim and a lid 28 that can be opened and closed.
Figure 3 is an enlarged explanatory diagram of the part shown in Figure 3 is an enlarged explanatory diagram of the cord presser.
FIGS. 4 and 5 are explanatory diagrams of the state of use, and FIGS. 6 and 7 are explanatory diagrams of the case of processing with a bobbin different from this invention. 22... Core wire connection housing part, 24...
・Excess length processing part, 34... Core wire presser, 38...
... Pad, 40 ... Seam, 102.
...Fiber core wire, 104... Core wire connection part.

Claims (1)

[Claims for Utility Model Registration] At least three flanges are provided on the outer surface of the cylindrical main body 12 of the bobbin, and a core wire connection portion accommodating portion 22 and an extra length processing portion 24 are separated by the flanges. a fiber core 102 is formed axially on the main body by passing through each of the ribs, a core fiber connection part 104 is accommodated in the connection part housing part 22, and Processing part 24
In the optical fiber surplus length processing bobbin that accommodates the surplus length of the fiber core inside, one unit of core wire can be passed through the portion where the core wire 102 passes through each of the ribs. A groove is provided, and on the inside of each of the brim at both ends of the connection portion accommodating portion 22, core wire pressers 34 holding the pads 38 divided in half are arranged facing each other, and two or more stages are arranged in the joint 40. The fiber core wires 102 on both sides of the core wire connection section 104 overlapped with each other,
An optical fiber surplus length processing bobbin characterized in that it can be held in two or more stages in the radial direction while keeping the fibers in a roughly straight state.