JPS61153604A - Structure of ferrule of optical connector - Google Patents

Abstract

PURPOSE:To improve the adhesiveness of a joint, to remove a grinding agent or a grinding solution completely at the grinding of an end surface and to improve the adhesion of optical fibers by inserting a material having higher spreading property than a raw material into the joints of the raw material which are radially generated from a fine hole by pressing. CONSTITUTION:In a ferrule 20 forming a fine hole 21 for optical fiber insertion by pressing, the joints 22 of the raw material which are radially generated around the fine hole 22 due to the deformation of the raw material at the time of pressing are filled with a material (solder or gold e.g. when stainless steel is used as the ferrule raw material) 23 having higher spreading property than the raw material. To form the ferrule structure, a material 32 having higher spreading property than the raw material is formed with a prescribed thickness on the inside of a hole 31 of an unpressed pipe-like raw material 30, the raw material is pressed by plural claws in the direction from its periphery to its center and the diameter of the hole is contracted down to the diameter of a wire. Finally, the wire is drawn out and the end surface and outer periphery are ground to complete the ferrule having the fine hole for inserting and fixing the optical fiber.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical connector for connecting optical fibers, and particularly to its ferrule structure.

[Conventional technology]

FIG. 3 is a diagram showing a conventional optical connector. This shows ferrules 3 and 4 to which optical fibers 1 and 2 are fixed, respectively.
are inserted into the sleeve 5 with their end surfaces butted against each other, and tightened with a bag nut 6.7.

It is fixed. In such optical connectors,
A method of forming the optical fiber insertion hole of the ferrule by press working has been developed. To explain this method with reference to FIG. 4, first, as shown in FIG. 4 a, a pipe-shaped material 10 is
A wire 12 having the same diameter as the optical fiber is inserted into the hole 11, and as shown in FIG. Reduce to. Finally, as shown in Figure 0, the wire is pulled out and the end face and outer periphery are ground to complete a ferrule 14 having a minute hole 13 into which an optical fiber is inserted and fixed.

[Problem that the invention seeks to solve]

In the above configuration, as shown in the front view of the end face of the ferrule in Figure 5a and the enlarged view of Figure 5A (section B in Figure A seam 14 of the material 10 is created. The non-uniformity of the degree of adhesion at the seam creates a void in the seam, in which the abrasive or polishing liquid from end face polishing remains, which adversely affects the adhesion of the optical fiber in the subsequent process. In order to prevent this, a high degree of adhesion is required, and for this purpose, there is a problem in that the inner surface of the hole in the material needs to be processed with ultra-precision.

[Means for solving problems]

The present invention provides an optical connector ferrule structure that solves the above problems, and its means include inserting a wire with the same diameter as the optical fiber into a hole in a pipe-shaped material, and pressing the outer periphery of the material. In an optical connector ferrule structure having a fine hole for inserting an optical fiber, which is formed by pulling out the wire after reducing the hole diameter to the diameter of the wire, the seam of the material is formed radially from the fine hole by pressing,
This is achieved by an optical connector ferrule structure characterized by interposing a material that is more malleable than the above material.

[Function] In the above-mentioned optical connector ferrule structure, when a microhole for inserting an optical fiber is formed by pressing, a material having more malleability than the material is interposed at the joints of the materials that are formed radially from the microhole by pressing. By doing so, the degree of adhesion at the joint is improved and voids are eliminated. Therefore, there is no residual abrasive or polishing liquid during end face polishing, and the reliability of adhesion of optical fibers is improved. In addition, the inner surface of the hole in the material does not require much precision machining.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a diagram for explaining the optical connector ferrule structure of the present invention, in which a is a perspective view, b is an enlarged view of FIG.

In this embodiment, in a ferrule 20 in which a minute hole 21 for inserting an optical fiber is formed by pressing as shown in FIG. As shown in Figure C, the material 23 is more malleable than the ferrule material (for example, if stainless steel is used as the ferrule material, solder, gold, etc.)
It is filled with

An example of a method for creating the ferrule structure of this embodiment will be described next. In this method, as shown in FIG. 2, a material 32 that is more malleable than the material is formed to a predetermined thickness on the inner surface of the hole 31 of a pipe-shaped material 30 before pressing, and the subsequent steps are shown in FIG. 4. You can use the process explained in .

In this embodiment configured as described above, the joint between the materials produced by pressing is filled with a malleable metal previously formed on the inner surface of the hole, so that no voids are formed and the degree of adhesion is improved.

〔Effect of the invention〕

As explained above, according to the present invention, the degree of adhesion at the seam of the material created by pressing does not depend much on the surface roughness of the inner surface of the material before pressing, so ultra-precision processing is not required, and the work This has the great effect of eliminating variations in quality and providing stable quality.

[Brief explanation of the drawing]

Fig. 1 is a diagram for explaining an embodiment of the optical connector ferrule structure of the present invention, Fig. 2 is a diagram for explaining its creation method, and Fig. 3 is a diagram for explaining a conventional optical connector. , FIG. 4 is a diagram for explaining an example of the manufacturing method,
FIG. 5 is a diagram for explaining the drawbacks of the conventional ferrule. In the figure, 20 indicates a pipe-shaped material, 21 indicates a micropore, 22 indicates a joint between the materials produced by pressing, and 23 indicates a highly malleable material.

Claims (1)

[Claims] 1. An optical fiber is formed by inserting a wire with the same diameter as the optical fiber into a hole in a pipe-shaped material, pressing the outer periphery of the material to reduce the hole diameter to the diameter of the wire, and then pulling out the wire. 1. An optical connector ferrule structure having a microscopic hole for insertion, characterized in that a material having higher malleability than the material is interposed at the joints of the materials that are formed radially from the microscopic hole by pressing.