JPS5932767B2 - Optical fiber V-groove connector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a V-groove connector that can connect optical fibers with low loss with simple operation.

The conventional optical fiber V-groove connector, as shown in Figure 1,
Width 1m for fixing fiber core wires to both ends of substrate 1
A fiber holding V-groove 2 with a diameter of about m and a wire holding V-groove 3 with a diameter of about 125 μm for fixing the fiber strand in the center are formed in a straight line, and the optical fiber housed in the substrate 1 is formed in a straight line. The clamp, which is divided into 3 parts to press and fix the V-groove 2
| It is provided so as to cover 3.

4 is a wire clamp for pressing and fixing the fiber wire, and 5 is a wire clamp for pressing and fixing the fiber core wire.

The wire clamp 5 is provided with a wire guide groove 6 for guiding the fiber core. In the connection work performed using such an optical fiber V-groove connector, first, the board 1 was attached to a connection jig (not shown), the coating of the fiber core was removed, and the fiber was cut to a predetermined length. Insert the optical fiber into the V-groove 3 of the wire holder, and have the same refractive index as the core around the wire portion.
Moreover, after slightly dropping a liquid (matching agent) with good optical transparency, the bare wire clamp 4 and the core wire clamp 5 are turned over as shown by the arrows in FIG. 1, and the optical fiber is temporarily fixed. In this state, the two optical fibers are further butted against each other, the bare wire clamp 4 and the core wire clamp 5 are pressed down with an appropriate force, and then these clamps 4, 5 and the substrate 1 are fixed with an adhesive to complete the connection. However, such optical fiber groove connectors have the following problems.

1 When fixing a fiber core to a V-groove connector with adhesive, it is necessary to clamp the fiber between the substrate 1 and the core clamp 5 in order to increase the mechanical strength of the connection and improve reliability. It is necessary to inject adhesive into the part where the fiber is attached to completely fix it, but the gap that is created when the fiber is squeezed between the fiber holder V groove 2 and the fiber guide groove 6 is small, and the V groove connection The adhesive had to be injected from both end faces of the container, resulting in poor workability and the inability to completely inject the adhesive.

When the two-strand clamp 4 and the core wire clamp 5 are placed over the substrate 1, the optical fiber is temporarily fixed, and the ends are butted together. It is necessary to apply pressure uniformly to the entire strand while accurately positioning it on the fiber 3, but the V-groove connector does not have a positioning function, and the clamp may become misaligned while butting the fibers together. There is also the above problem.

The present invention aims to eliminate such drawbacks and provide an optical fiber groove connector that can facilitate adhesive injection and provide a positioning function to the clamp, thereby improving connection workability and connection characteristics. .

The structure of the present invention that achieves this object includes a fiber presser V groove in which the fiber core of the optical fiber to be connected is housed and an adhesive is injected therein, and a core V groove in which the fiber core is housed and the adhesive is injected. A core wire having a substrate having a wire holding V groove formed in a straight line, and a core wire guide groove provided to cover each of the V grooves and pressing and fixing the fiber core wire and the fiber core wire of the substrate soil. In an optical fiber V-groove connector consisting of a clamp and a wire clamp, protrusions are provided at both ends along the linear V-groove on the top surface of the substrate, and recesses are formed at positions corresponding to the V-grooves on the back surface of the substrate. On the other hand, positioning protrusions are provided at outer ends corresponding to both ends of the V-groove of the core wire clamp to project to both sides and to be positioned by coming into contact with the end surfaces of the projections, and communicate with the core wire guide groove. It is characterized by having an adhesive injection hole. Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

2 to 3A and 3B show an embodiment of the optical fiber V-groove connector of the present invention, FIG. 2 is an exploded perspective view, FIG. 3A is a central cross-sectional view, and FIG. Figure 3b is a central longitudinal sectional view.

On the upper surface of the substrate 11 of the optical fiber connector, wire holding grooves 12 for holding the fiber core are formed at both ends, and a wire holding V groove 13 for holding the fiber wire is formed in the center. These V grooves 12-13-12 are arranged in a straight line.

Further, protrusions 14 are formed at both ends of the upper surface of the substrate 11 along the V-grooves 12 and 13, and the cross-sectional shape of the substrate 11 is concave, but it is about a fraction of the width of both ends of the V-groove 12. has no protrusion 14 and remains flat. Furthermore, two gripping portions 15 are provided in the longitudinal direction on the lower surface of the substrate 11 for attachment to a connection jig during connection work. On the other hand, the substrate 11
The clamp that is covered by the V-grooves 12 and 13 is divided into three parts and is inserted into the protrusion 14 with a gap of about 0.05 to 0.1 mm.

Two wire clamps 16 for holding down the fiber core are provided so as to face the wire holding V groove 12. A wire guide groove 17 is formed on the lower surface of the wire clamp 16, and when the wire clamp 16 is inserted into the board 11, the end of the wire clamp 16 located on the outside of the board 11 has a wire guide groove 17 formed therein. Positioning protrusions 18 for positioning by pressing against the protrusions 14 are provided so as to protrude from both sides. Further, the cable clamp 16 is provided with an adhesive injection hole 19 that communicates with the cable guide groove 17 . Further, a wire clamp 20 for holding down the fiber wire is provided to be located between the core wire clamps 16. And these core wire clamps 16
A grip portion 21 for attaching to a connection jig is provided on the upper surface of each of the wire clamps 20. As described above, by providing the positioning protrusion 18 on the wire clamp 16, after temporarily fixing the fibers and butting the fiber ends together, the wire clamp 16 can be pushed lightly in the direction of the bare wire clamp 20, and the wire can be fixed. The positioning protrusion 18 of the clamp 16 comes into contact with the end surface of the protrusion 14 of the substrate 11, so that constant positioning can be achieved at all times. Therefore, when pressing the core wire clamp 16 and the strand clamp 20 with an appropriate force after the butt, the strands can be pressed uniformly and the connection characteristics are improved. In addition, since the fiber clamp 16 is provided with an adhesive injection hole 19, it becomes easy to inject the adhesive, improving work efficiency and ensuring that the adhesive is sufficiently poured around the fiber core to connect the fiber. Improved characteristics and reliability.
As shown in Table 1, when comparing the conventional optical fiber groove connector with the optical fiber V-groove connector of the present invention, it is clear from the table that the tensile strength has improved. I understand that.

The adhesive used was a cyanoacrylate adhesive. Next, considering the case of manufacturing the optical fiber V-groove connector of the present invention, it is made by cutting metal materials or molding plastics. It is often molded in a unique color, and when inserting the fiber wire into the V-groove 13, the substrate 11
If the color of the fiber is white or transparent, it will be difficult to distinguish it from the fiber wire.

Therefore, by inserting a color patch or the like into the plastic, the V-groove connector can be colored in a medium-bright color such as blue to light blue or clay, making it easier to identify the fiber wire and improving workability. Mukoto. Further, normally, the board 11 is used by being attached and fixed to a simple connection jig 22 as shown in FIG. In order to prevent this, the board 11 may be fixed by floating it above the connection jig 22 using the grip part 15.

Furthermore, if the wire clamp 20 is pressed against the substrate 11 fixed to the connection jig 22, the substrate 11 may be distorted.
3, distortion can be reduced and good connection characteristics can be achieved.

The recess 23 also has the function of eliminating molding distortion when molding with plastic. In addition, in the above embodiment, the case where there is only one groove in a straight line to connect two optical fibers was explained, but when connecting multiple optical fibers, V grooves can be added according to the number of optical fibers to be connected. Just do it.

As described above in detail with the embodiments, according to the present invention, the positioning protrusion of the core wire clamp facilitates positioning, and the adhesive injection hole facilitates the injection of adhesive, further improving the workability of the connection work. This improves the connection properties such as the tensile strength of the joint, and improves reliability. Also,
The concave portion on the back surface of the substrate improves the connection characteristics, and when molding with plastic, molding distortion can also be eliminated.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of a conventional optical fiber V-groove connector, and FIGS. 2-3A and 3B show an embodiment of the optical fiber groove connector of the present invention, and FIG. 2 is an exploded state. Figure 3a is a central cross-sectional view, Figure 3b is a central longitudinal cross-sectional view, Figure 4 is a perspective view of
The figure is an explanatory diagram of the connection work. In the drawings, 11 is a substrate, 12 is a wire holding groove, 13 is a wire holding groove, 14 is a protrusion, 15 is a gripping portion, 16 is a wire clamp, 17 is a wire guide groove, 18 is a positioning projection, 19 2 is an adhesive injection hole, 20 is a wire clamp, 21 is a gripping part, 2
2 is a connection jig, and 23 is a recess.

Claims (1)

[Scope of Claims] 1. A wire presser V groove in which the fiber core of the optical fiber to be connected is stored and an adhesive is injected, and a wire presser V in which the fiber wire is stored and the adhesive is injected. A wire clamp and wire having a substrate having grooves formed in a straight line, and a wire guide groove provided to cover each of the V grooves and pressing and fixing the fiber core and the fiber wire on the substrate. In an optical fiber V-groove connector comprising a clamp, protrusions are provided at both ends of the top surface of the substrate along the straight V-groove, and a recess is formed at a position corresponding to the V-groove on the back surface of the substrate; An adhesive injection hole is provided at an outer end corresponding to both ends of the V-groove of the cable clamp, and is provided with a positioning protrusion that protrudes to both sides and is positioned by coming into contact with an end surface of the protrusion, and also communicates with the cable guide groove. An optical fiber V-groove connector characterized by being provided with. 2. The optical fiber V-groove connector according to claim 1, characterized in that the optical fiber V-groove connector is made of plastic and colored by inserting a color batch into the plastic. Optical fiber V-groove connector.