JPH11237536A - Coated optical fiber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coated optical fiber with excellent cold resistance and fire resistance at a low cost by constituting it by an ultraviolet-setting resin layer for covering the outer peripheral part of an optical fiber and a mixed resin layer for which polyvinyl chloride resin and polyester elastomer are mixed for covering the outer peripheral part of the ultraviolet-setting resin layer. SOLUTION: This coated optical fiber 1 is constituted of the optical fiber 2 whose diameter is 125 microns, the ultraviolet-setting resin layer 3 whose outer diameter dimension is 250 microns for covering the outer peripheral part of the optical fiber 2 and the mixed resin layer 4 whose outer diameter dimension is 500-900 microns for covering the outer peripheral part of the ultraviolet ray setting resin layer 3. For the mixed resin layer 4, the one for which the polyvinyl chloride resin and the polyester elastomer are mixed and the mixing ratio is 3:7-7:3 corresponding to the using purpose is used. The coated optical fiber 1 of such a structure is provided with both of the cold resistance and the fire resistance by the mixed resin layer 4 and is manufactured at a low cost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber.

[0002]

2. Description of the Related Art Conventionally, there has been used an optical fiber core wire in which an outer peripheral portion of an optical fiber is covered with a polyvinyl chloride resin or an optical fiber core wire in which an outer peripheral portion of an optical fiber is covered with a nylon resin or polyester elastomer. .

[0003]

The conventional optical fiber coated with a polyvinyl chloride resin is inexpensive and excellent in flame retardancy, but has a drawback of poor cold resistance. Also,
An optical fiber coated with a nylon resin or polyester elastomer has cold resistance and rebound resilience, but has the disadvantage of being expensive.

The present invention has been made in view of the above-mentioned conventional drawbacks,
It is an object of the present invention to provide an optical fiber core wire having rebound resilience, being inexpensive and having excellent cold resistance and flame retardancy.

The above and other objects and novel features of the present invention will become more completely apparent when the following description is read in conjunction with the accompanying drawings. However, the drawings are for explanation only, and do not limit the technical scope of the present invention.

[0006]

In order to achieve the above object, the present invention provides an optical fiber, an ultraviolet curable resin layer covering an outer peripheral portion of the optical fiber, and at least a poly resin covering the outer peripheral portion of the ultraviolet curable resin layer. An optical fiber core is constituted by a mixed resin layer obtained by mixing a vinyl chloride resin and a polyester elastomer.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings.

In the first embodiment of the present invention shown in FIGS. 1 and 2, reference numeral 1 denotes an optical fiber core of the present invention. The optical fiber core 1 includes an optical fiber 2 having a diameter of 125 microns, The outer diameter dimension covering the outer peripheral portion of the optical fiber 2 is 25
It is composed of an ultraviolet curable resin layer 3 having a thickness of 0 μm and a mixed resin layer 4 having an outer diameter of 500 to 900 μm covering the outer peripheral portion of the ultraviolet curable resin layer 3.

The mixed resin layer 4 is a mixture of a polyvinyl chloride resin and a polyester elastomer, and the mixing ratio thereof is 3: 7 to 7: 3 depending on the purpose of use. Further, the mixed resin layer 4 may be formed by mixing a polyvinyl chloride resin and a polyester elastomer with a flame retardant such as a bromine-based flame retardant, antimony trioxide, and a shell-forming agent to improve the flame retardancy. .

The optical fiber core 1 having the above-described structure can be manufactured at low cost while having both cold resistance, flame retardancy and rebound resilience by the mixed resin layer 4.

[0011]

Next, different embodiments of the present invention shown in FIGS. 3 to 6 will be described. In the description of the different embodiments of the present invention, the same components as those of the first embodiment of the present invention are denoted by the same reference numerals, and duplicate description will be omitted.

The second embodiment of the present invention shown in FIGS. 3 and 4 is mainly different from the first embodiment of the present invention in that the outer peripheral portion of the optical fiber 2 is covered with an ultraviolet curable resin layer 3. The PVC resin layer 5 covering the outer periphery of the optical fiber 7 having a diameter of 250 μm covered with the above, and the outer diameter dimension covering the outer periphery of the PVC resin layer 5 is 500.
Since the coating layer 6 made of the mixed resin layer 4 having a thickness of about 900 μm is formed, the optical fiber core 1A thus formed has the same operation and effect as those of the first embodiment of the present invention. Is obtained.

The third embodiment of the present invention shown in FIGS. 5 and 6 is mainly different from the second embodiment of the present invention in that a mixed resin covering the outer peripheral portion of the optical fiber 7 is provided. An optical fiber cord formed in this way is formed by forming a coating layer 6A comprising a layer 4 and a polyvinyl chloride resin layer 5 having an outer diameter of 500 to 900 microns covering the outer peripheral portion of the mixed resin layer 4. 1B, the second aspect of the present invention
The same operation and effect as those of the embodiment can be obtained.

[0014]

As apparent from the above description, the following effects can be obtained in the present invention.

(1) An optical fiber, an ultraviolet curable resin layer covering the outer peripheral portion of the optical fiber, and a mixed resin layer of at least a polyvinyl chloride resin and a polyester elastomer covering the outer peripheral portion of the ultraviolet curable resin layer. Therefore, the mixed resin layer can have both cold resistance, flame retardancy and rebound resilience. Therefore, it can be used easily without deterioration in characteristics.

(2) According to the above (1), since the mixed resin material is used, the amount of the expensive polyester elastomer used is reduced, and the production can be performed at low cost.

(3) Claims 2, 3, and 4 also provide (1),
The same effect as (2) can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view of the first embodiment of the present invention.

FIG. 3 is a perspective view of a second embodiment of the present invention.

FIG. 4 is an enlarged cross-sectional view of a second embodiment of the present invention.

FIG. 5 is a perspective view of a third embodiment of the present invention.

FIG. 6 is an enlarged sectional view of a third embodiment of the present invention.

[Explanation of symbols]

 1, 1A, 1B: optical fiber core wire, 2: optical fiber, 3: ultraviolet curing resin layer, 4: mixed resin layer, 5: polyvinyl chloride resin layer, 6, 6A: coating layer, 7: optical fiber strand .

Claims (4)

[Claims] 1. An optical fiber, an ultraviolet curable resin layer covering an outer peripheral portion of the optical fiber, and a mixed resin layer of at least a polyvinyl chloride resin and a polyester elastomer covering an outer peripheral portion of the ultraviolet curable resin layer. An optical fiber core wire, characterized in that: 2. An optical fiber, an ultraviolet curable resin layer covering an outer peripheral portion of the optical fiber, and a mixed resin layer in which a flame retardant is mixed with a polyvinyl chloride resin and a polyester elastomer covering an outer peripheral portion of the ultraviolet curable resin layer. An optical fiber core wire comprising: 3. An optical fiber having a diameter of 125 microns;
An ultraviolet curable resin layer covering the outer periphery of the optical fiber so as to have an outer diameter of 250 microns; and a polyvinyl chloride resin covering the outer periphery of the ultraviolet curable resin layer so as to have an outer diameter of 500 to 900 microns. And a mixed resin layer in which a polyester elastomer is mixed in a ratio of 3: 7 to 7: 3. 4. An optical fiber having a diameter of 250 μm and an outer peripheral portion of the optical fiber having an outer diameter of 500 to 500 μm.
An optical fiber core comprising: a coating layer comprising a polyvinyl chloride resin layer and a mixed resin layer obtained by mixing a polyvinyl chloride resin and a polyester elastomer so as to have a thickness of 900 microns.