JPH0470609A - Connector ferrule for optical fiber - Google Patents

Abstract

PURPOSE:To enable accurate, short-time machining and to reduce the manufacture cost by inserting a fiber into the axial hole of a capillary and performing the internal and external diameter positioning of a ferrule frame. CONSTITUTION:This ferrule consists of capillaries 7 which are machined sectionally, the ferrule frame 4 into which the capillaries 7 are inserted, and a flanged fixed part 5 into which the ferrule frame 4 is inserted. The optical fiber 2 is inserted into the axial holes 7a of the capillaries 7 to perform the internal and external diameter positioning of the ferrule frame 4, and then low-fusion- point alloy 9 is supplied to the gap between the ferrule frame 4 and capillaries 7 and solidified. Consequently, the connector ferrule which is more accurate than conventional ferrule is obtained at low cost without using any special working machine.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a ferrule that is a part of an optical fiber connector used to connect optical fibers.

CSummary of the Invention 1 The present invention consists of a capillary machined into a ring shape, a ferrule frame into which the capillary is inserted, and a flanged fixing part into which the ferrule frame is inserted, and which is arranged in an axial hole of the capillary. This optical fiber connector ferrule is characterized in that after inserting the optical fiber wire and locating the inner and outer diameters of the ferrule frame, a low melting point alloy is poured into the gap between the ferrule frame and the capillary and solidified. A good ferrule can be obtained in a short time.

[Prior Art] As shown in FIG. 5, a conventional ferrule consists of a ferrule frame 4 in which an axial hole 4a into which the fiber strand 2 of the optical fiber 1 is inserted and fixed is formed, and a ferrule frame 4 in which the optical fiber 1 is carefully inserted and fixed. It consists of a flanged fixing part 5 in which a fiber coating guide part 5a for inserting and fixing the fiber coating 3 is formed.

The flange side of the flanged fixing part 5 has a counterbore hole 5b at its axis, into which the ferrule frame 4 is press-fitted, and the ferrule frame 4 and the flanged fixing part 5 are integrated.

The ferrule frame 4 is subjected to a donor process to obtain the axial hole 4a, and the outer periphery is subjected to a grinding process and a polishing process.

[Problems to be Solved by the Invention] The conventional ferrule described above has a problem in that it is difficult to perform eccentric machining between the outer periphery of the ferrule frame and the shaft center hole, so it takes a long time to perform accurate machining and is expensive. There is.

[Means for Solving the Problems] The present invention, which solves the above-mentioned conventional problems, includes a capillary processed into a round shape, a ferrule frame into which the capillary is inserted, and a flanged national standard into which the ferrule frame is inserted. After inserting an optical fiber into the axial center hole of the capillary and locating the inner and outer diameters of the ferrule frame, a low melting point alloy is poured into the gap between the ferrule frame and the capillary and solidified. .

[Function] By configuring as described above, the ferrule has better accuracy than conventional ferrules (it can be obtained at low cost without using a special processing machine).

[Example 1 Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 is a side sectional view of a ferrule frame constituting an optical fiber connector ferrule according to an embodiment of the present invention.

FIG. 2 is a side sectional view of a capillary constituting an optical fiber connector ferrule according to an embodiment of the present invention.

FIG. 3 is a side sectional view of an optical fiber connector ferrule according to an embodiment of the present invention.

FIG. 4 is a side sectional view when positioning the inner and outer diameters of the ferrule frame.

The optical fiber connector ferrule of this embodiment includes a capillary 7 processed into a ring shape, a ferrule frame 4 into which the capillary 7 is inserted, and a flanged fixing part 5 into which the ferrule frame 4 is inserted. ing.

The ferrule frame 4 has a cylindrical shape and is made of ceramic.

First, the outer diameter of the ferrule frame 4 shown in FIG. 1 is polished to a predetermined size, for example, 2.degree. 499 mm. Further, the axial hole 7a of the capillary 7, which has been cut in advance into a round shape, is finished to a diameter of 125 μm by laser processing.

Next, as shown in FIG. 4, the capillary 7 is inserted into the capillary insertion portion 6 of the ferrule frame 4, and a jig 8 for positioning concentric inner and outer diameters is placed over the capillary with reference to the outer diameter. This jig is finished so that the concentricity of the inner diameter with respect to the outer diameter is 05 μm or less.

Next, the fiber wire 1a is inserted into the fiber insertion hole 8a of the inner and outer diameter concentric positioning jig 8, and further inserted into the axial hole 7a of the capillary 7, and the inner and outer diameters are aligned. A low melting point alloy 9 with excellent thermal deformation is poured into the gap between the capillary insertion part 6 and the capillary 7 and solidified.
Next, the inserted fiber strand 1a is pulled out, so that the desired precision of concentricity of the inner and outer diameters can be obtained.

Next, the ferrule frame 4 is press-fitted into the flanged fixing part 5.

[Advantageous Effects of the Invention 1] As described above, the present invention enables processing with high precision and in a short time by inserting a fiber wire into the axial center hole of a capillary and locating the inner and outer diameters of the ferrule frame, thereby reducing manufacturing costs. effective.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of a ferrule frame constituting an optical fiber connector ferrule according to an embodiment of the present invention. FIG. 2 is a side sectional view of a capillary constituting an optical fiber connector ferrule according to an embodiment of the present invention. FIG. 3 is a side sectional view of an optical fiber connector ferrule according to an embodiment of the present invention. FIG. 4 is a side sectional view when positioning the inner and outer diameters of the ferrule frame. FIG. 5 is a side sectional view of a conventional optical fiber connector ferrule. 2 ・ ・ 4 ・ ・ 5 ・ ・ 7 ・ ・ 7 a ・ 8 ・ ・ 9 ・ ・ ・Fiber wire, ferrule frame, fixed part with flange, capillary, capillary axis hole, inner and outer diameter concentric positioning jig. Low melting point alloy Applicant Seiko Electronic Industries Co., Ltd. Agent Patent attorney Keinosuke Hayashi Figure 1 Figure 2 Ko 4 Figure 5

Claims (1)

[Claims] It consists of a capillary processed into a ring shape, a ferrule frame into which the capillary is inserted, and a flanged fixing part into which the ferrule frame is inserted, and an optical fiber is inserted into the axial hole of the capillary to form the ferrule. A connector ferrule for an optical fiber, characterized in that after positioning the inner and outer diameters of the frame, a low melting point alloy is poured into the gap between the ferrule frame and the capillary and solidified.