JPS60263104A - Core of optical fiber connector - Google Patents

Abstract

PURPOSE:To support a fiber element wire stably and to form a tough structure which is hard to break by forming a main body and a holder of sintered metal such as stainless steel in one body and specifying the length of the holder, and boring a holding hole in said holder to its overall length. CONSTITUTION:The holding hole 27 bored in the axial center of the holder 24b to its overall length is large enough to insert the fiber element wire 5 almost without clearance, and its length is much larger (e.g. 2-4mm.) than the diameter. While a connector is connected to both sides of a connecting tool 33, front end surfaces 26 of cores 24 of both connectors 2 are pressed against each other with the energizing force of presser springs 31 of the connectors 2. Consequently, fiber element wires 5 held in holding holes 27 of cores 24 of the connectors 2 are aligned to each other without axial deviation and they are straight. Consequently, light for communication which is transmitted through one fiber element wire 5 is transmitted to the other fiber element wire 5 with small loss.

Description

[Detailed description of the invention] The present invention aims to solve the following problems.

(Industrial Application Field) The present invention relates to a connector used for connecting optical fibers, and specifically relates to a core in the connector.

(Prior technology) The core of this optical fiber connector is provided with a plate-shaped holder at the tip of the cylindrical body, and the fiber wire is inserted into the through hole drilled in the holder. In the case where the fiber element S is held in place, the length of the through hole is short, so that the fiber element S tends to be left in an inclined state.

In order to eliminate this drawback, if the core is constructed with a ceramic capillary inside a metal cylindrical body, the capillary will break if an impact force is applied to the core during connection work, etc. There were very few problems. Attempts have also been made to form the core from a synthetic resin material, but books made in this manner often suffer from the problem of deformation during the connection work described above or when used over time.

(Problems to be Solved by the Invention) The present invention eliminates the above-mentioned conventional problems and provides a core for an optical fiber connector that can stably support fiber wires in a predetermined direction and has a structure that is strong and resistant to damage. This is what we are trying to provide.

The configuration of the present invention is as follows.

(Means for Solving the Problems) The present invention takes the measures as described in the claims above, and its effects are as follows.

(Function) The long holding hole stably supports the fiber string in a predetermined direction. Further, the main body and the holder integrally made of sintered metal are affected by forces exerted on them from the outside (Embodiment) The drawings showing the embodiments of the present application will be described below. In FIGS. 1 to 3, reference numeral 1 indicates a well-known fiber cord, and 2 indicates a connector attached to one end of the keel. The above-mentioned fiber cord l is a fiber core 3 (thickness is, for example, 0.9111 mm) as is well known.
), L and a covering 4 surrounding it. As is well known, the fiber core 113 is composed of a fiber wire 5 (thickness: 123 μm, for example) and a covering member 6 made of nylon or the like surrounding the fiber wire 5. Next, in the connector 2, reference numeral 8 denotes a cylindrical connector main body, which is constituted by members 9 to 21 in a well-known manner, that is, a nine-piece frame, which includes a first element 10 and a second element screwed thereto. Element 1]
It consists of ν is a Kevlar presser, and Moon is a Kevlar presser case, which is screwed onto the second element 11. These are the thread-like Kevlar 14 that comes out when the fiber cord is unraveled.
As is well known, it is fixed. L5 is a hood, which is made of an elastic material such as rubber. Reference numeral 16 indicates an annular spring seat formed on a part of the inner circumferential surface of the second element H. ν
indicates an annular receiving piece formed on the inner circumferential surface of the first element 10. The sliding part shows a receiving piece fixed to the outer circumferential surface of the first element 10 in a circumferential manner, and the east part shows a rotation stopper piece projected from a part of the receiving piece. A tightening napht is provided around the outer circumferential side of the first element [0], and has an inner flange-like push piece on the inner circumferential surface.

Next, we must show the core. In this case, 24a is a cylindrical main body, and 24b is a holder provided inside the tip of the main body 24a, which is formed integrally with the main body 24m.

Reference numeral 6 denotes a connecting part (insertion part), 1 denotes a distal end surface (joint surface), and I denotes a holding hole drilled along the entire length of the holder 24b at its axis, into which the fiber wire 5 is inserted almost without any gaps. It is formed into a size that can be used. Further, the length L is sufficiently longer than the diameter (for example, about 2WII to 11a). Number 4 indicates the tapered part provided at the base of the core, and number 4 indicates the insertion hole. I is an annular spring seat, which is fitted onto the outer peripheral surface of the tapered part from the base side of the core feeder. The barrier is a pressure spring, which is interposed between the spring seat 16 and the spring seat I. Incidentally, a fiber core wire 3 is connected to the core as is well known. That is, the fiber core 4I3 is inserted into the insertion hole 4, and the fiber strand 5 exposed at the tip of the core wire 3 is inserted into the holding hole η. In this case, adhesive is placed in the insertion hole 9 and the holding hole n in advance. The covering body 6 and the fiber element #5 of the fiber core 13 are adhered to the inner surface of the insertion hole 4 and the inner surface of the holding hole I, respectively, by the adhesive. Further, the end surface of the fiber 11 wire 5 is polished so as to be flush with the end surface of the core feeder.

The wings then show the well-known connectors. In this figure, y is a housing, 35 is a threaded portion, a fitting portion for preventing rotation, I is a sleeve holder, and 38 is a split sleeve.

When the fiber cords 1 are connected to each other using the connectors 2, the connectors 2 attached to the ends of the respective cords 1 are coupled to the connectors as shown in FIG. That is, the insertion part of the inner sleeve is inserted into the sleeve flange of the connector, and is screwed into the threaded part of the 20-piece connector in the connector body 8. In this case, the rotation stopper piece 19 of the frame 9 fits into the fitting part iris, and the frame 90 is prevented from rotating relative to the connector.

In the state where the connectors 2 are connected to both sides of the connector by the above-mentioned means, that is, the state shown in FIG. The distal end surfaces are joined to face each other as shown in the figure. In this case, both cores 24 are held concentrically by the sleeve fins. Further, the tip surfaces 26 of the cores in each connector 2 are pressed against each other by the urging force of the pressing barb 31 of each connector 2. Therefore, in each connector 2, the fiber elements Is5 held in the holding holes η of the respective core chests face each other straight without misalignment. As a result, the communication light transmitted through one fiber element IIJ5 is transmitted toward the other fiber element 5 with less loss.

Next, the means for manufacturing the above-mentioned core feed will be explained with reference to the flowchart shown in FIG. J of the drawings. First, metal powder and a binder are prepared as materials.

As the metal powder, 8U83/1. L, 8T] 83
Stainless steel powder such as 0 dah or other metal powder having the same degree of hardness and corrosion resistance is used, such as the powder shown in front of the right. The particle size of the powder used is, for example, 32J mesh or less.

The above materials are mixed and formed into a cylinder in the next forming step. Note that extrusion molding, for example, is used as the molding means. In addition, the product dimensions of the cylindrical body are, for example, an outer diameter of 7mm.
, with an inner diameter of approximately /Jff. Next, the cylinder is sintered. This operation is carried out, for example, by heating the molded article (cylindrical body) in a heating furnace. A cylindrical body of sintered metal is thereby formed. Next, the sintered metal cylindrical body is drawn so that the outer diameter is, for example, 4xx, and the inner diameter is 0, /WM. Next, the drawn thin cylindrical body is cut into a predetermined length as a core material to obtain a core material having a round hole with a small diameter (O, /IEI). Next, the inner surface of the round hole is finished in the cut core material, and the inner surface of the round hole is finished to form the fiber holding hole η. For example, wire wrapping is used for finishing. That is, first, as shown in FIG. 6(A), a polishing wire is inserted through the base hole 401C of the core material.

This polishing wire 4 has a tapered part (and a large diameter part 4).The thick wire d is inserted through the round hole, and the wire 41 is coated with abrasive grains, and the wire 41 and the core are The inner surface of the round hole is polished by moving and rotating it in the axial direction relative to the material circle.As this polishing progresses, the sixth
As shown in Figure (B), the taper part 42Vi is gradually turned into a neutral force, and by further polishing, the large diameter part of the wire nail becomes a round hole 4011 as shown in Figure 60.
1' [It will be in the inserted state. As a result, the round hole is finished to a predetermined inner diameter K as the fiber holding hole I. Next, the outer peripheral surface of the portion of the core material (material) that will become the insertion portion 2 is finished.

This finish is the same as the above-mentioned polished multiplication hole 40 (retaining hole 27).
The outer peripheral surface is polished so that it is concentric with the reference point. By this polishing, the outer diameter of the insertion portion 6 is finished to 2.5M. Next, process the external and internal shapes of the base part of the material (in other words, process the taper section and bore the insertion hole. The boring process is performed halfway through the material, The holder 24b is left behind.

In addition, the narrowest diameter part of the above-mentioned taper section is, for example, 2.3M.
It is processed to be about 11. By performing the above-mentioned processing, the core feed is completed.

Next, different examples of manufacturing processes will be explained. First, after the sintering process described above and before the drawing process, the cylindrical part of the sintered metal may be subjected to primary processing as shown in (a).

The next step is to finish the outer surface in the same way as above. Such secondary processing is easy because the size of the object is large. By performing the above-described primary processing, the inner and outer finishing operations of the hole after the drawing process and cutting process are applied to the processed material are simplified.

Next, as a second different method, after forming the narrow cylinder having a predetermined outer diameter and inner diameter in the forming process and sintering it to form a narrow cylinder of sintered metal. ,(B)
It is also possible to proceed to the cutting step as shown in FIG.

Next, as a third different method, in the molding process, the core material having predetermined dimensions is formed with gold,
After sintering it and making it into a sintered metal core material7, (c)
Moving on to the process of finishing the inner surface as described above (effects of the invention) As described above, in this invention, when the fiber iI5 is inserted into the holding hole I, even if the base of the fiber iI5 is bent. The long holding hole n allows the part inserted into the holding hole I to be forcefully held in a predetermined direction. This has the effect that when this connector is connected to another connector and light is transmitted between these fiber wires, the transmission can be carried out with extremely little loss.

In addition, if an impact is applied to the tip of the core during handling such as connector connection work, the tip of the core, which has a solid structure with the main body 24a and the long holder 24b integrally formed, will be damaged. In addition, they are made of sintered metal such as stainless steel and have high bending resistance (strength and high viscosity and resistance to chipping), and are resistant to crushing and deformation. Features that can prevent damage
The advantage of this is that it can be used for a long time.

[Brief explanation of drawings]

The drawings show an embodiment of the present application, and FIG. 1 is a vertical cross-sectional view of the connector with a fiber cord connected, and FIG.
The figure is a partially cutaway perspective view showing the relationship between the connector and the connection tool.
Figure 3 is a longitudinal sectional view of the core, Figure 2 is a vertical sectional view showing how the connectors are connected to each other using a connecting tool, Figure 5 is a chart showing the manufacturing process of the core, and Figure 6 is a holding FIG. 3 is a vertical cross-sectional view for explaining the finishing process of the inner surface of the hole. Required...core, 24m...main body, 24b...holding body, I...holding hole, 1...fiber cord, 6...
Fiber wire〇22 Fig. 5 (1) Fig. 6 (A) CB)

Claims (1)

[Claims] A holder is provided on the inner peripheral side of the tip of the hollow main body, and a fiber holding hole is bored in the holder at a position where the fibers of the main body intersect, and the fiber is inserted into the holding hole. In the core of an optical fiber connector in which the fiber wire can be held in a precise position of the main body by the holding hole, the main body and the holder are integrally formed of sintered metal such as stainless steel, and A core for an optical fiber connector, wherein the holding body is formed to have a length of 21EI or more, and the holding hole is formed over the entire length of the holding body.