JPS6234110A - Manufacture of optical fiber composite electric wire - Google Patents

Abstract

PURPOSE:To give an optical fiber extra length by putting optical fibers in plural groove which are formed in the outer peripheral part of a spacer while extending spirally, and twisting the spacer when the spacer is inserted into a tubular body and an element wire group is extended around the outer periphery of the tubular body to complete a composite electric wire. CONSTITUTION:A grooved spacer 4 which have plural spiral extending grooves in the outer peripheral part is used as the spacer and optical fibers are put in those grooves 5. Then, this spacer 4 is inserted into the tubular body 7, and external layer element wires 3 are arranged closely around the outer periphery and are twisted so that the spiral of the grooves 5 are loosened. Consequently, the spacer is twisted and the twist of the optical fibers 6 put in the grooves 5 are therefore loosened and given extra length to prolong the life of the composite electric wire 1.

Description

Detailed Description of the Invention [Industrial Application Field 1] The present invention relates to an optical fiber composite in which an optical fiber is housed in a spirally extending groove of a grooved spacer, and then an outer layer strand is placed on the grooved spacer. This invention relates to a method for manufacturing electric wires.

[Prior Art J] Figure 3 shows the construction of a general optical fiber composite electric wire. The optical fiber composite electric wire 1 is connected to the optical fiber unit 2
and a plurality of outer layer strands 3 arranged around the optical fiber unit 2.

The optical fiber unit 2 includes a grooved spacer 4 having a spirally extending groove 5, an optical fiber 6 housed in the groove 5, and a tubular body 7 surrounding the grooved spacer 4.

The life of the optical fiber composite t@a1 is determined by the tensile stress applied to the built-in optical fiber 6.

Therefore, conventionally, when manufacturing the optical fiber composite electric wire 1, measures are often taken to alleviate the tensile stress applied to the optical fiber that occurs when the electric wire is stretched. Specifically, when the optical fiber 6 is housed in 1fXs of the grooved spacer 4, the optical fiber 6 is housed in the groove 5 while air is injected. As a result, the optical fiber 6 is housed in the groove 5 with an extra length.

[Problems to be Solved by the Invention] However, storing the optical fiber 6 in the groove 5 while injecting air is a very complicated and difficult task. This makes it difficult to manufacture products with uniform quality.

Therefore, an object of the present invention is to provide a method for manufacturing an optical fiber composite electric wire that can provide an extra length to the optical fiber 6 housed in the groove 5 of the grooved spacer 4 with a simple operation. be.

[Means for Solving the Problems] In the method for manufacturing an optical fiber composite wire according to the present invention, after storing an optical fiber in a grooved spacer.

The grooved spacer is characterized by being twisted in the direction in which the spiral of the groove becomes loose.

[Operation] When the grooved spacer is twisted as described above, the twist of the optical fiber spirally extending along the groove of the grooved spacer 5 is also loosened, resulting in an extra length.

[Example] This invention makes it possible to easily provide an arbitrary extra length to the optical fiber 6 housed in the iM 5 by utilizing the spiral @5 formed in the grooved spacer 4. It is intended to do so. That is, after the optical fiber 6 is accommodated in the spirally extending groove 5 of the grooved spacer 4 and the grooved spacer 4 is further covered with the tubular body 7, the entire structure is inserted into the grooved spacer 4. If the spiral is twisted in the direction of loosening, the optical fiber 6 housed in the groove 5 is given an extra length as shown in the following equation.

However, in the formula, Δl15: Extra length of optical fiber (%) L: Length of grooved spacer per rotation 1IIl)P
: Spiral groove pitch of grooved spacer (Ill) D: Twisted diameter of optical fiber (mm). Note that the twist radius of the optical fiber is shown in FIG.

Now, assume that the length of the grooved spacer 4 is 5 m, and that the grooved spacer 4 of 5 lengths is twisted one rotation. As an example, if P-150+em and D-3,81 are used, the remaining length of the optical fiber will be 0.019%. In this way, if the grooved spacer 4 is twisted, f
The twist of the optical fiber 6 spirally extending along the length 15 will also be loosened, resulting in an extra length. thus,
It is possible to arbitrarily provide an optical fiber storage section, and therefore it is possible to extend the life of the optical fiber composite electric wire.

In order to clearly describe the effects obtained by this invention,
Let us consider the relationship between the elongation strain applied to an optical fiber and the life of the optical fiber. There is the following relational expression between them.

However, in the formula, n, +m is an index N that depends on the strength of Nigarasu, the number of breaks during coni cleaning (times/km), εr: elongation (%) applied to the optical fiber, tr: time during which ε is loaded (S
ec) εP Elongation during varnish cleaning (%) t:
Load time of ε1 (sec) L: Fiber length (kl 1: l': probability of fiber breakage of llv.
Screening is a process in which a larger load is applied to the manufactured T-iper than when it is used, thereby breaking and removing defective fibers to ensure the quality of the fibers.

In formula (4), m-4, n = 23, t, -1 sec
.

N, -0,1 times/fv, L = 1000km, F-0゜01, ε and -1%, when ε□-0,3%, life t, = 6.41 x 108sec wheel 20 years When ε -0.28%, the lifespan t=3.13x10'sec is 99 years.

Next, an apparatus used to carry out the present invention will be explained using FIGS. 1 and 2.

FIG. 1 shows one example of such a device, and FIG. 2 shows another example of such a device.

Referring to FIG. 1, the grooved spacer is pulled out from the spacer bobbin 10. The optical fiber pulled out from the optical fiber bobbin 11.11 is housed in the groove of the grooved spacer. After that, the spacer is attached to the bobbin 1 for the bamboo-like body.
The tape pulled out from 2 is wound. This tape becomes a tubular body surrounding the spacer. Thereafter, the entire optical fiber unit, that is, the optical fiber unit, is wound onto the winding bobbin 13. At this time, the winding bobbin 13 is rotated approximately around the optical fiber unit to be wound, as shown by the arrow. let This rotation of the winding bobbin 13 gives twist to the optical fiber unit. In other words, the grooved spacer is also twisted, thereby creating an extra length for the optical fiber housed in the groove of the named spacer.

In FIG. 2, 14 is a spacer bobbin, 15 is an optical fiber bobbin, 16 is a tubular body bobbin, and 17 is a winding bobbin. Unlike the device shown in FIG. 1, the winding bobbin 17 does not rotate when winding the optical fiber unit. Instead, another winding bobbin 18 is provided. The optical fiber unit wound on the winding bobbin 17 is wound again on the prepared winding bobbin 18. During this winding operation, one winding bobbin 17 or the other winding bobbin 18 is rotated as shown by arrow B. This rotation imparts twist to the optical fiber unit, ie, the grooved spacer.

- [Effects of the Invention] As described above, according to the present invention, after an optical fiber is housed in a grooved spacer, the grooved spacer is twisted in the direction in which the spiral of the groove is loosened. The twist of the optical fiber spirally extending along the groove is loosened, resulting in extra length.

Therefore, an extra length can be created in the optical fiber with a very simple operation, and the extra length can be easily controlled. In this way, it becomes possible to easily manufacture an optical fiber composite electric wire that has a long life and is highly reliable.

[Brief explanation of the drawing]

FIG. 1 is an illustrative diagram showing an example of an apparatus used to carry out the present invention. FIG. 2 is an illustrative diagram showing an example of an apparatus used to carry out the present invention. FIG. 3 is a sectional view showing the structure of a general optical fiber composite wire. In the figure, 1 is an optical fiber composite electric wire, 2 is an optical fiber unit, 3 is an outer layer wire, 4 is a grooved smoother, 5 is a groove, 6 is an optical fiber, 7 is a tubular body, and 10 is a bobbin for a spacer. , 11 is a bobbin for an optical fiber, 12 is a bobbin for a tubular body, 13 is a winding bobbin, 14 is a bobbin for a spacer, 15 is a bobbin for an optical fiber, 16 is a bobbin for a tubular body, and 17 and 18 are winding bobbins. .

Claims (2)

[Claims] (1) In a method for manufacturing an optical fiber composite wire in which an optical fiber is housed in a spirally extending groove of a grooved spacer and then an outer layer strand is placed on the grooved spacer, the optical fiber is housed in the grooved spacer. and then twisting the grooved spacer in a direction in which the spiral of the groove loosens. (2) When winding the grooved spacer onto the winding bobbin, the winding bobbin is rotated approximately around the grooved spacer to be wound around the rotation axis, thereby giving twist to the grooved spacer. , a method for manufacturing an optical fiber composite electric wire according to claim 1.