JPS58115402A - Optical fiber core - Google Patents

Abstract

PURPOSE:To easily remove a covering layer, by mixing a lubricant for improving a stripping-off property, into the primary covering layer of an optical fiber, or into a covering layer on said layer. CONSTITUTION:On an optical fiber 10, a primary covering 20, a cushion layer 30 and a secondary covering 40 are formed. As for a material of the primary covering, its resin contains a lubricant for improving a stripping-off property between its resin and a covering material on said resin. As for the primary covering material, for instance, epoxy resin, polyurethane, and other various materials are used, and as for the cushion layer, silicone rubber, etc. are used. As for the material for improving a stripping-off property of both these layers, hydrocarbon such as paraffin, low molecular weight polyethylene, etc., stearic acid, higher fatty acid such an n-nonadecylenic acid n-tricosanoic acid, etc., and other materials are desirable.

Description

[Detailed description of the invention] FIELD OF THE INVENTION The present invention relates to optical fiber cores.

The cross section of the most common structure of the optical fiber in use is shown in the first section.
As shown in the figure.

In Figure 1, 10 is an optical fiber, oJl) is 1
In the next coating, a modified silicone rubber (methyl 7-Elborisholium-san) with a refractive index much greater than that of the optical fiber 1O cladding is used, and the thickness is several tens of degrees - S. Young's modulus silicone rubber (dimethylpolysiloxane) is used, and the thickness is about 100 degrees. The primary coating is made of thermoplastic resin such as polyethylene or polyethylene. ◎ When connecting such optical fibers, it is necessary to align the axes of the fibers to be connected based on their external dimensions.
Next, the upper layers, including IJ7, were removed to expose the optical fiber 10, which was then cut to an appropriate length and connected with a clean fiber end surface exposed. To remove the coating, the primary coating was first mechanically removed using a precision stripper, and then the remaining coating was wiped off with paper, gauze, absorbent cotton, etc. soaked in a solvent. .

This method essentially involves mechanically removing the coating and exposing the fiber in the loincloth, which causes scratches on the fiber surface and reduces the strength of the fiber, and requires removal using a solvent. Therefore, the workability was poor. In addition, bare optical fibers with their coatings removed are not only easily damaged, but also
It is also weak against bending, so it was necessary to handle it very carefully during connection, and to quickly reinforce it after connection.In order to overcome this drawback, 1 Happi IIJ7 and Kutsushi Soon Layer were used. However, current optical fiber core wires generally have good adhesion between the primary coating and the first layer, or between the first layer and the second coating. Therefore, it is extremely difficult to remove the other mat layers while leaving only the primary coating or the seventh coating and the carbon fiber layer.
o -/10 μm, it is difficult to align the fibers with each other with high precision, and the test piece may protrude from the end face of the heavy fiber and interfere with alignment, so it is difficult to align the fibers with high precision. It was difficult to connect. Furthermore, when making a bonding connection, the primary coating X and the tamper-resistant layer X decompose, severely reducing the strength of the fused portion.

SUMMARY OF THE INVENTION An object of the present invention is to provide a cored optical fiber that eliminates the above-mentioned drawbacks.

1 and 1 show cross-sections of embodiments of the invention;
lI is the optical fiber, X is the primary coating, X is the Kutsushi carbon layer,
〃 is a co-order covering.

Primary subject I! As the material x, the 41m fat contains the resin and the material coated on it (in the case of Figure J, the coating material for the thickening layer x1 and in the case of Figure 1, the coating material for the secondary coating). Does it contain a lubricant that improves releasability between the parts?
Or, the material coated on the primary coating (two layers of shoes X in the case of Figure 2, the secondary coating in the case of Figure J) has good threshold releasability from the primary coating X. Contains lubricant.

The primary coating material in the present invention is not particularly limited, and examples thereof include polyoxy resin, polyurethane, vinylidene fluoride resin, polyester, liptadiene, polyelectrolyte, polyamideimide, silicone resin, phenol resin, and urethane resin. Examples include atarylate resin, Evo medium diacrylate resin, and the like. As a coating material that meets the purpose of the present invention, a material with relatively high mechanical strength is desirable in order to protect the optical fiber, and in order to avoid leaving residual liquid during fusion splicing, it is desirable to use a material that volatilizes due to oxidation or decomposition. Or combustible materials are preferred. In addition, the material of the shoe 91 layer is particularly
It is not electrically conductive and is usually made of silicone rubber. Similarly, I don't particularly like the primary coating material (
Usually, thermal IU resins such as nylon and polypropylene are used.

The lubricant that improves releasability is not particularly limited (the lubricant that improves release properties is not particularly limited), and the lubricant that improves release properties is not particularly limited. The lubricant to be used is determined by the solubility, curing conditions of the seventh coating, and the type of coating material applied on the seventh coating.Specific materials include paraffin, medium-low molecular weight polyenalene, etc. Hydrocarbons, higher fatty acids such as stearic acid, n-nonadecylenic acid, n-) licosanoic acid, aliphatic alcohols such as pentadecanol and octadecanol, various fatty acid amides, metal soaps, fatty acid Nisful 1 silicone oil, fluorine substitution Examples include carbonized water volume.

The above lubricant-containing resin is coated on the optical fiber 10 immediately after spinning, as in the case of conventional silicone rubber, and dried and solidified in an electric furnace. This is the same as in FIG. 1, which shows the cross section of the fiber core. In addition, when the Tasshi attack layer is removed as described above (see Figure 1)
There is also.

In the present invention, (1) 1. Since the coating IIx contains a lubricant that improves the releasability between it and the coating layer to be tested on it,
Example: The layer 912 of the shoe 912 or the layer λ coat a10 of the shoe 912 above can be easily peeled off using a slipper or the like.

Therefore, if the tt optical fiber 10 with the first coat IIJ7 is easily exposed and the second coat The purpose of preserving the surface of the fiber 10 can be achieved. Therefore, even if it is connected with it attached, it will not cause problems such as eccentricity or loose fitting, and will not deteriorate the strength of the 7-ring IPA.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional optical fiber, and FIGS. 2 and 3 are sectional views of an embodiment of the optical fiber of the present invention. 10... Optical fiber, X.../9 coating, X... Kutsushi carbon layer, Q... Koji coating.

Claims (1)

[Scope of Claims] L An optical fiber core wire in which a primary coating is provided on the optical fiber, and a cushion layer and a primary coating are sequentially provided thereon, or only the primary coating is provided. For coating, 1
A primary coating is provided on the optical fiber core 7-IPA, which is characterized by containing a lubricant that improves the peelability between the coating layer to be tested on the next coating, and In an optical fiber core wire in which a cushion layer and a secondary coating are sequentially provided or only a secondary coating is provided, a lubricant that improves peeling between the test layer and the primary coating is added to the test layer provided on the primary coating. An optical fiber core wire characterized by containing the following.