JPH06288826A - Optical fiber and its manufacture - Google Patents

Abstract

PURPOSE:To easily control the amount of adhesive used for fixing an optical fiber cord and a cap by forming an adhesive well at the opening space of the middle part of the through hole of the cap for inserting and fixing the optical fiber cord. CONSTITUTION:The end structure of the title optical fiber cord is constituted of a fiber cord consisting of an optical coated fiber 1 and a sheath 2 and a cap 3 and an optical fiber end face 4 facing the tip port of the cap 3 is mirror finished. The through hole of the cap 3 for inserting and fixing the optical fiber cord consists of a tip part 5c for engaging the coated fiber 1, a middle part 5b for forming an adhesive well 6 at an opening space, and a base part 5a for engaging the optical fiber cord. For manufacturing, the sheath 2 is peeled off the edge part of the optical fiber cord and an adhesive is applied to the coated fiber 1 and then the coated fiber is inserted into the through hole, thus easily controlling the amount of adhesive, preventing contamination due to the adhesive on mirror-surface machining, and at the same time obtaining a sufficient adhesion strength.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber cord and a method for manufacturing the same, and more specifically, a base is fixed to the end of a plastic optical fiber cord, and the end face of the base of the base is a mirror surface. The present invention relates to an optical fiber cord and a manufacturing method thereof.

[0002]

2. Description of the Related Art An optical fiber cord in which a base is fixed to the end of a plastic optical fiber cord, and the end face of the optical fiber at the base of the base is a mirror surface is conventionally used by removing the coating material of the optical fiber cord. After fixing the cord and the base firmly with an adhesive, cut the extra fiber protruding from the base of the base with a blade and mechanically polish this part, or use a hot plate (heated mirror surface plate) The end face was mirror-finished.

In the technique of thermally processing the end face of the optical fiber or the optical fiber cord with a hot plate or the like, for example, first, the end face of the optical fiber is pressed against the heating plate at a right angle, and the optical plate is heated by the heating plate. The end face is heated to the heat deformation temperature, and the temperature of the heating plate is lowered to room temperature to lower the end face temperature, which can further improve the flatness of the flat surface, prevent the peripheral edge from being chipped, and transmit the light. Optical fiber end face processing method that can improve characteristics (Japanese Patent Publication No. 60-15
No. 241), a plastic optical fiber is inserted into a tubular body having a notch formed at the inner corner of the end on the effective surface side, and the tip is heated to prevent unplugging from the tubular body. Optical fiber light guide to improve polishing accuracy (Japanese Patent Publication No. 62-57)
No. 001), a plastic optical fiber is inserted into a cylinder having a chamfer, and the tip of the plastic fiber is heated to fill the chamfer, so that the end of the optical fiber can be securely fixed and high precision. There is a method of manufacturing a light guide that enables end face finishing (JP-A-58-187903). The optical fiber cord provided with the base can be used as a point sensor head or a connector for communication.

[0004]

In the conventional fiber cord using the mouthpiece having the through hole into which the bare fiber and the fiber cord are fitted, the adhesive is applied in a small amount at the time of the production. It is difficult to control the coating amount and to apply it uniformly. Therefore, if the amount of adhesive applied is large, the adhesive overflows and stains the hot plate, making it difficult to mirror-finish the surface.On the other hand, if the amount of adhesive applied is too small, the adhesive strength between the die and the optical fiber becomes insufficient. Will be enough.

The present invention has been made based on the above background, and an object thereof is to easily control the amount of the adhesive used for fixing the optical fiber cord and the base. It is an object of the present invention to provide an optical fiber cord capable of preventing stains at the time of mirror surface processing due to the above, and obtaining sufficient adhesive strength, and a manufacturing method thereof.

[0006]

The above object can be achieved by the optical fiber cord and the manufacturing method thereof according to the present invention. That is, the optical fiber cord according to the present invention comprises an optical fiber cord composed of an optical fiber and a coating material for coating the optical fiber, and a base fixed to the end of the optical fiber cord, and the light exposed to the tip end of the base. An optical fiber cord whose fiber end surface is a mirror surface, and this mouthpiece has a through hole for inserting and fixing the optical fiber cord, and the through hole has a tip end for inserting the bare optical fiber and the bare optical fiber. It is characterized in that it comprises an intermediate portion which is inserted and forms an adhesive reservoir in the gap space, and a base portion into which the optical fiber cord is fitted.

Further, in the method of manufacturing an optical fiber cord according to the present invention, the through hole has a tip portion into which the bare optical fiber is inserted, and an intermediate portion into which the bare optical fiber is inserted to form an adhesive reservoir in the gap space. And a base into which the optical fiber cord is fitted, a base is prepared, and the coating material is peeled off from the end of the optical fiber cord including the optical fiber and the coating material for coating the optical fiber. Alternatively, apply an adhesive to the bare optical fiber, insert the end of the optical fiber, cut the optical fiber core protruding from the tip of this base, if necessary, and melt the core end through the mirror surface. It is characterized by solidifying and transferring the mirror surface to the end surface of the optical fiber core wire.

[0008]

The optical fiber cord and the method of manufacturing the same according to the present invention having the above-described structure operates and acts as follows. The base according to the present invention has a through hole including a tip portion into which a bare optical fiber is inserted, an intermediate portion into which the bare optical fiber is inserted to form an adhesive reservoir in a gap space, and a base portion into which an optical fiber cord is fitted. Have.

An end portion of an optical fiber cord made of an optical fiber and a coating material for coating the optical fiber is inserted into the through hole of the base from its base portion. At this time, the end portion of the optical fiber strips the covering material from the optical fiber. An adhesive is applied to the inner surface of the through hole of the base and / or the bare optical fiber. Bare wire of the inserted optical fiber and the covering material of the unpeeled part are respectively on the tip and the base of the through hole of the base,
Get in.

On the other hand, a gap is formed between the optical fiber cord and its bare wire at the intermediate portion between the base portion and the tip portion, and a part or an excess of the applied adhesive agent is accumulated in this gap. When the optical fiber core wire protrudes from the tip of this base,
If necessary, the optical fiber core wire is cut, the core wire end is melted and solidified via the mirror surface, and the mirror surface is transferred to the end surface of the optical fiber core wire.

[0011]

The present invention will be described more specifically with reference to the following examples. FIG. 1 shows a sectional view of an optical fiber cord according to the present invention. The end structure of the optical fiber cord according to this aspect includes an optical fiber cord including an optical fiber 1 and a coating material 2 that coats the optical fiber, and a cap 3 fixed to an end of the optical fiber cord. The optical fiber end surface 4 facing the end opening is a terminal structure of an optical fiber cord having a mirror surface, and this base 3 has a through hole 5 for inserting and fixing the optical fiber code, and the through hole inserts an optical fiber bare wire. It comprises a front end portion 5c, an intermediate portion 5b into which a bare optical fiber is inserted to form an adhesive reservoir 6 in a gap space, and a base portion 5a into which an optical fiber cord is fitted. In this mode, the taper 7 is formed at the tip end of the die, and the tip of the optical fiber is enlarged by heating.

In the present invention, the tip portion 5c of the through hole 5
The hole diameters of the optical fiber cord and the base portion 5a are approximately the same as or near the diameter of the optical fiber cord and the diameter of the bare optical fiber. Further, the hole diameter of the intermediate portion 5b of the through hole is such that a gap is formed between the through hole and the optical fiber cord or the bare optical fiber that is fitted in the intermediate portion.

Next, a method of manufacturing this optical fiber cord will be described. First, the through hole 5 has a tip portion 5c into which the bare optical fiber is inserted, an intermediate portion 5b into which the bare optical fiber is inserted to form an adhesive reservoir 6 in the gap space, and a base portion 5a into which the optical fiber cord is fitted. Prepare the base 3 consisting of.
Remove the coating material from the end of the optical fiber cord consisting of the optical fiber and the coating material that coats the optical fiber, apply the adhesive to the bare optical fiber, and insert the optical fiber end portion,
If necessary, the optical fiber core wire protruding from the tip end of the die is cut, the core wire end is melted and solidified via the heated mirror surface, and the mirror surface is transferred to the end surface of the optical fiber core wire.

[0014]

According to the optical fiber cord and the manufacturing method thereof of the present invention, the amount of the adhesive used for fixing the optical fiber cord and the base can be easily controlled,
It is possible to prevent stains during mirror finishing with an adhesive and to obtain sufficient adhesive strength.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an optical fiber cord according to the present invention.

[Explanation of symbols]

 1 ... Optical fiber core wire 2 ... Coating material 3 ... Base 4 ... End surface 5 ... Through hole 5a ... Base part 5b ... Intermediate part 5c ... Tip part 6 ... Adhesive reservoir 7 ... taper

Claims (2)

[Claims] 1. An optical fiber cord comprising an optical fiber and a coating material for coating the optical fiber, and a base fixed to an end of the optical fiber cord, and an end face of the optical fiber facing the front end is a mirror surface. Wherein the base has a through hole into which the optical fiber cord is inserted and fixed, and the through hole has a tip portion into which the bare optical fiber is fitted,
An optical fiber cord comprising: an intermediate portion into which a bare optical fiber is inserted and which forms an adhesive reservoir in a gap space; and a base portion into which the optical fiber cord is fitted. 2. A through hole is formed from a tip portion into which a bare optical fiber is inserted, an intermediate portion into which the bare optical fiber is inserted to form an adhesive reservoir in a gap space, and a base portion into which an optical fiber cord is fitted. Of the optical fiber and the coating material for covering the optical fiber, peel off the coating material from the end of the optical fiber cord, and apply adhesive to the inner surface of the through hole of the base and / or the bare optical fiber. Then, insert the end of the optical fiber, and if necessary, cut the optical fiber core wire protruding from the tip end of the mouthpiece, melt and solidify the core wire end through the mirror surface, and make the mirror surface of the optical fiber core wire. A method for manufacturing an optical fiber cord, characterized in that the optical fiber cord is transferred onto the end face.