JPH03142408A - Ferrule of connector - Google Patents

Abstract

PURPOSE:To reinforce a coated optical fiber and to increase the strength as well as to fit the fiber to the proper position of a ferrule without increasing the diameter or causing eccentricity by covering the fiber with a flexible pipe and filling resin into the gap between them. CONSTITUTION:The tip part of a coated optical fiber 11 is covered with a flexible synthetic resin pipe 12 such as a nylon or polyester pipe and resin 13 such as epoxy or silicone resin is filled into the gap between the coat 11a of the fiber 11 and the pipe 12. The pipe 12 contg. the fiber 11 is fitted into a ferrule 2 from an end 2c after putting in a hole 2e of a large diameter. Since the fiber 11 is covered with the pipe 12, it is fitted to the center of the ferrule 2 without causing eccentricity. Even if the coat 11a of the fiber 11 is thin, the fiber 11 is reinforced with the pipe 12 and can maintain satisfactory strength.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a connector ferrule used in an optical connector.

(Prior art) A connector ferrule, for example, as shown in FIG.
The optical fiber core wire 1, which has the coating 1a on the tip side removed to expose the optical fiber lb, is inserted into the ferrule 2 and fixed with adhesive, and is a single core such as D type or FC type based on the specified standard. It is used in optical connectors to optically connect optical fibers.

Here, the ferrule 2 is as shown in FIG.
A hole through which the optical fiber core l is inserted is formed in the center of the main body 2b, which has a flange 2a formed on the outer periphery, from the proximal end surface 2c to the distal end surface 2d.
The dimensions of each company are determined based on a predetermined standard in order to correspond to the shape of the optical fiber core 1. That is, the inner diameter of the large diameter hole 2e, which opens at the base end surface 2c and into which the coated portion of the optical fiber core 1 is inserted, is 1.
mm, and the inner diameter of the guide hole 2f, which is formed concentrically with this large diameter hole 2e and guides the optical fiber core 1 to be inserted, is 0.5 mm.
mm, opening at the tip surface 2d concentrically with this guide hole 2f,
The inner diameter of the insertion hole 2g into which the optical fiber 1b is inserted is 0.12.
It is 5mm.

(Problem to be Solved by the Invention) In recent years, with the increase in the density of optical fibers, tape core wires made of multi-core fibers such as 5-core and 8-core fibers have come to be used. Like the four-core tape core wire 3 shown, there is one in which four optical fiber core wires 4 each having a diameter of 0.25 mm are formed into a tape shape using a coating material 5, which is manufactured by coating an optical fiber having a diameter of 0.125 mm. .

This tape core wire 3 can separate the optical fiber core wire 4 into individual core wires, and can be inserted into the above-described ferrule 2. As described above, the ferrule 2 has a large diameter hole 2e with an inner diameter of 1fffffl. Therefore, when a tape core wire 3 having a smaller diameter than the large diameter hole 2e is inserted into the ferrule 2, the tape core wire 3 is inserted into the large diameter hole 2e because the clearance between the tape core wire 3 and the inner surface of the large diameter hole 2e is large. There have been problems in handling the connector ferrule, such as eccentricity and lack of strength due to the small diameter of the tape core wire 3.

The present invention has been made in view of the above points, and even if the optical fiber core wire inserted into the ferrule has a small diameter, the optical fiber core wire can be inserted at an appropriate position without eccentricity, and, An object of the present invention is to provide a connector ferrule in which an optical fiber core has sufficient strength.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a connector ferrule in which the tip of an optical fiber core is inserted into the ferrule, in which a flexible pipe is attached to the optical fiber core. At the same time, at least a portion between the pipe and the optical fiber core wire is filled with resin.

(Function) The diameter of the optical fiber core wire is increased by the attached flexible pipe and the filled resin, and the optical fiber core wire is inserted into the ferrule at an appropriate position without eccentricity. Furthermore, the optical fiber core wire is reinforced with a flexible pipe and resin, increasing its strength.

(Example) Hereinafter, an example in which the present invention is applied to a connector ferrule for an FC type optical connector will be described in detail based on FIGS. 1 to 4. In the drawings, members that are the same as those of the conventional one are denoted by the same reference numerals, and detailed explanation thereof will be omitted.

As shown in FIG. 1, the connector ferrule IO is a flexible pipe (hereinafter simply referred to as "pipe") in which a coating material 12 is attached to an optical fiber core wire 11 inserted into a ferrule 2.
A resin 13 is filled between the optical fiber core wire 12 and the optical fiber core wire 11 and the distal end side of the optical fiber core wire 11 is inserted into the ferrule 2.

The optical fiber core wire 11 is a core wire with a diameter of 0.25 mm, which is smaller in outer diameter than a single core optical fiber core wire, and has a coating 11 on the tip side.
a is removed to create an optical fiber with a diameter of 0.125 mm/<l
lb is exposed. And this optical fiber core wire 11
The optical fiber llb is placed in the guide hole 2f and the insertion hole 2g on the tip side of the ferrule 2, and the portion covered with the coating 11a is placed in the large diameter hole 2e.

The pipe 12 is made of a flexible synthetic resin such as nylon, polyester, or Teflon, and as shown in FIGS. It is filled with a resin 13 such as epoxy or silicone and attached to the optical fiber core 11.

Then, the optical fiber core wire 11 is attached to this attached pipe 1.
2 is placed in the large diameter hole 2e and inserted into the ferrule 2 from the proximal end surface 2C side. In this way, the optical fiber core wire
Since the pipe 12 is attached to the outer periphery, the ferrule 2 can be inserted into the center of the ferrule 2 without eccentricity. Furthermore, even if the thickness of the coating 11a is thin, the optical fiber core wire 11 is reinforced by the pipe 12 and has sufficient strength.

Note that the resin 13 may be filled over the entire length between the coating 11a of the optical fiber core 11 and the pipe 12, as shown in FIG.

(Effects of the Invention) As is clear from the above description, according to the present invention, in the connector ferrule in which the tip of the optical fiber core wire is inserted into the ferrule, a flexible pipe is attached to the optical fiber core wire. In addition, since at least a portion of the space between the pipe and the optical fiber core wire is filled with resin, the diameter of the optical fiber core wire is increased, and the optical fiber core wire can be inserted at the center position of the ferrule without eccentricity. Further, since the optical fiber core wire is reinforced by the pipe and given sufficient strength, even if it is small in diameter, it can be inserted into the ferrule 4° and used without worrying about strength.

[Brief explanation of the drawing]

1 to 4 show one embodiment of the present invention, FIG. 1 is a cross-sectional front view of a connector ferrule, FIG. 2 is a cross-sectional front view of an optical fiber core equipped with a pipe, and FIG. Figure 4 is a cross-sectional front view of a connector ferrule showing another modification example, Figure 5 is a cross-sectional front view of a conventional connector ferrule, and Figure 6 is a cross-sectional view of the ferrule shown in Figure 5. The front view and FIG. 7 are perspective views of the tape core.

Claims (1)

[Claims] In a connector ferrule in which the tip of an optical fiber core wire is inserted into the ferrule, a flexible pipe is attached to the optical fiber core wire, and a resin is applied to at least a portion between the pipe and the optical fiber core wire. A connector ferrule characterized by being filled.