JPS6035703A - Ferrule for end of optical fiber - Google Patents

Abstract

PURPOSE:To facilitate processing and to improve accuracy by combining a rod having plural external grooves in which optical fibers are set in a direction parallel to the axial direction with a pipe contacting with the outside of the rod to form a ferrule. CONSTITUTION:A columnar rod 5 is made of metal, glass, ceramics or the like with high hardness, and plural grooves 51 are cut around the rod 5 in a direction parallel to the axial direction so that the outsides of optical fiber cores 41 coincide with the outside of the rod 5 when the cores 41 are set in the grooves 51. After setting and fixing the cores 41 in the grooves 51, the rod 5 is inserted and fixed in a pipe 6 whose inside diameter corresponds to the outside diameter of the rod 5, and the end of the rod 5 is polished. By this construction, the processing is facilitated, and the accuracy can be improved.

Description

[Detailed Description of the Invention] ial Technical Field of the Invention The present invention relates to a ferrule for an optical fiber terminal, and in particular to a ferrule for an optical fiber terminal that is capable of stably fixing two or more optical fibers. be.

(bl Technology background) In recent years, optical fibers have been widely used for long-distance communications, but optical fiber connections are very thin and are much more difficult than conventional metal wire connections. There is a strong demand for the development of a ferrule for optical fiber terminals that can stably and accurately fix optical fiber terminals.

(C) Problems with the Prior Art FIG. 1 is a cross-sectional view for explaining a conventional ferrule for an optical fiber terminal, and 1 is the ferrule body.

2 is an optical fiber insertion hole, 3 is an optical fiber core fixing part, and 4 is an optical fiber insertion hole.
is an optical fiber, and 41 is an optical fiber core wire.

A plurality of optical fiber insertion holes 2 are cut in a ferrule body 1 made of a high hardness material such as metal, glass, ceramic, etc., and an optical fiber core fixing part 3 is formed at one end of the ferrule body 1. After inserting the optical fiber 4 into the optical fiber insertion hole 2 and fixing the optical fiber core 41 at the end thereof to the optical fiber core fixing part 3, the end surface A of the ferrule body 1 is polished. . However, since the optical fiber core wire 41 is very long (8 m), and the material of the ferrule body 1 is very hard, the machining is done by round-lighting, which is problematic.

(d) Object of the Invention In view of the problems of the prior art, an object of the present invention is to provide a ferrule for optical fiber terminals that is easy to machine and has high precision.

(Configuration of the 81 Invention - In order to achieve the above-mentioned object, the present invention provides an axial force of 1 on the outer peripheral surface.
i14 Consisting of a rod with a plurality of parallel grooves into which the optical fibers fit, and a pipe circumscribing the rod, or a plurality of grooves parallel to the axial direction on the inner surface into which the optical fibers fit. This is achieved by comprising a cylinder having a shape formed therein and a rod inscribed in the cylinder.

(fl) Embodiments of the Invention Hereinafter, embodiments of the errule for optical fiber terminals according to the present invention will be described in detail with reference to the drawings.

FIG. 2 is a perspective view of a cylindrical rod, f8+ is a perspective view of a cylindrical rod, FIG. 2B is a perspective view of a pipe, and FIG. 2C is an assembled side view.
(d) is a sectional view of the main parts, in which the same parts as in the previous figure are given the same reference numerals, and 5 is a cylindrical rod.

6 is a pipe, 7 is a fixing agent, 42 is a tapered portion with a number for the purpose of facilitating insertion of the fiber, and 51 is a groove.

The optical fiber core 41 is parallel to the outer peripheral surface of the cylindrical rod 5 made of high hardness metal, glass, ceramic, etc. in the axial direction.
When fitted, the outer periphery of the optical fiber 41 is
A plurality of grooves 51 are formed to coincide with the outer circumference of the cylindrical rod 5, and inner grooves 51 corresponding to the outer circumference of the optical fiber core 41 fitted and fixed in the grooves 51 (inserted and fixed in a vibro of ￥D) are formed. , the end face of the cylindrical rod 5 on the optical fiber terminal side is polished.

FIG. 3 is a perspective view of a cylinder (al is a perspective view of a cylinder,
(b) is a perspective view of the cylindrical rod, and (C) is an assembled side view. Parts equivalent to those in the previous figure are given the same reference numerals.
8 is a cylinder, 9 is a cylindrical rod, and 81 is a groove.

When the optical fiber core wire 41 is fitted axially parallel to the inner circumferential surface of the cylinder 8 made of high-hardness metal, glass, ceramic, etc., the outer circumference of the optical fiber core wire 41 is
A plurality of cylindrical rods 9 are formed, each having an outer diameter corresponding to the inner diameter when the optical fiber core wire 41 is fitted into the groove 51 and fixed thereto.
The end face of the cylinder 8 on the optical fiber terminal side is polished together with the optical fiber core wire 41.

In this embodiment, three grooves have been described, but the number is not limited to three, and a plurality of grooves may be used. Furthermore, although the shape of the groove has been described as a V-shape, it is not limited to a V-shape, but may be a U-shape or other shapes.

fg) Effects of the Invention As is clear from the above explanation, the ferrule for optical fiber terminals according to the present invention is easier to process and can be expected to have higher precision than conventional ferrules.
It is extremely advantageous when applied to optical communication lines.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view for explaining a conventional ferrule for an optical fiber terminal, and FIG. 2 is a cross-sectional view for explaining an embodiment of a ferrule for an optical fiber terminal according to the present invention. Perspective view, (b) is a perspective view of the pipe, (C)
(d) is an assembled side view, and (d) is a cross-sectional view of the main part. FIG. 3 is a perspective view of a cylinder (al is a perspective view of a cylinder,
(b) is a perspective view of the cylindrical rod, and (C) is an assembled side view. In the figure, 1 is a ferrule body, 2 is an optical fiber insertion hole, 3 is an optical fiber core fixing part, 4 is an optical fiber, 5 and 9 are cylindrical rods, and 6 is a pipe. 7 is a bonding agent, 8 is a cylinder, 41 is an optical fiber core, 42 is a tapered portion, and 51 and 81 are grooves, respectively. Figure 1 Figure 3 (Q) (b) 1 (C)

Claims (2)

[Claims] (1) A ferrule for an optical fiber terminal, comprising a rod having a plurality of grooves parallel to the axial direction on its outer peripheral surface and into which optical fibers are fitted, and a pipe circumscribing the rod. (2) A ferrule for an optical fiber terminal, comprising a cylinder having a plurality of axially parallel grooves formed on the inner surface into which the optical fibers fit, and a cylindrical rod inscribed in the core.