JPS625206A - Connector for optical fiber - Google Patents

Abstract

PURPOSE:To easily and surely connect optical fibers by constituting a connector of a pair of eccentric die holders, plural eccentric dies disposed respectively in the positions deviated at a slight distance from the center and couplers. CONSTITUTION:The eccentric dies 8-10, 11-13 having the die holes of the diameter larger by 2DELTA then the outside diameters of the optical fibers 6, 7 in the positions deviated respectively by the slight distance DELTA from the center are provided to a plug 2 and socket 3 of the connector 1. A cap nut 14, fixture 15, etc. to couple the plug 2 and the socket 3 are provided. The fibers 6, 7 are exposed by a prescribed length from optical fiber jackets 4, 5 and are passed respectively into the die holes of the dies 8-10, 11-13 in the case of connecting the fibers 6, 7. An adhesive agent 20 is then poured into the spacing between the plug 2 and the fiber jacket 4 and at the same time the socket 3 and the jacket 5 are fixed by the fixture 15. The loss in the connecting stage of the fibers 6, 7 is thus minimized.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an optical fiber connector.

(Prior Art) Optical fiber connectors are used to connect optical fibers to optical devices, or to connect optical fibers to optical devices such as light emitters and light receivers.

As an optical fiber connector, (1) Taxation is possible and reproducibility is good.

(2) Low connection loss.

(3) Good compatibility.

(4) Good operability and ease of use.

(5) High reliability.

In particular, low connection loss and easy and reliable connection are required.

Conventionally known optical fiber connectors include those using a double-wound core tube that adjusts the optical fiber to the center of the outer diameter of the plug by alternately rotating the inner eccentric tube and the intermediate eccentric tube, or those using an optical fiber connector. A plug with a hole larger than the diameter of the support pipe is used, the core of the optical fiber is set at the center of the outer diameter of the plug, and then the gap is filled with adhesive to fix it, and the optical fiber is inserted into the center of the plug. A precision nozzle plug with a precision microhole is used, and an optical fiber is inserted into the nozzle and fixed with an epoxy resin adhesive.

However, with any of these connectors, it is very time-consuming and requires skill to position the optical fiber accurately, and a slight connection error can cause the axis of the optical fiber to shift or create a gap on the end face of the optical fiber. There is a problem in that the optical fiber axis may become loose or bent, resulting in a significant increase in connection loss.

Currently, the development of optical fiber is remarkable, and it is said that in the near future it will be widely used not only in various businesses and offices, but also in homes. connectors have not yet been developed.

[Problems to be solved by the present invention]

The present invention has been developed from the viewpoint of ridges, and its purpose is to easily and reliably connect optical fibers, and to avoid misalignment of the axis of the optical fiber during connection and to avoid gaps on the end face of the optical fiber. It is an object of the present invention to provide an optical fiber connector in which connection loss does not increase due to the occurrence of cracking or bending of the optical fiber axis.

(Means for Solving the Problem) Therefore, the above purpose is to install a pair of eccentric die holders, each at a position eccentric by a minute distance Δ from the center, and by 2Δ from the outer diameter of the optical fiber to be held. A plurality of eccentric dies each having a large diameter die hole and arranged in different eccentric directions in the pair of eccentric die holders; This is achieved by an optical fiber connector comprising a coupler that connects the pair of retainers so that the ends of the optical fibers are opposed to each other.

[For production]

With the above configuration, optical fibers can be connected easily and reliably, and there is no possibility that the axis of the optical fiber will be misaligned, a gap will be formed on the end face of the optical fiber, or the axis of the optical fiber will be bent during connection. Therefore, connection loss can be kept extremely low.

〔Example〕

Hereinafter, the details of the present invention will be specifically explained with reference to the drawings.

FIG. 1 is an explanatory diagram showing an embodiment of the optical fiber connector according to the present invention, FIG. 2 is a front view in the direction A in FIG.
FIG. 3 is an enlarged sectional view of the optical fiber portion fixed by the eccentric die in the optical fiber connector, and FIG. 4 is a graph showing splice loss characteristics of the optical fiber connector according to the present invention.

In Figures 1, 2, and 3, 1 is an optical fiber connector, 2 is a plug, 3 is a socket, and 3a is the socket 3 mentioned above.
4 and 5 are optical fiber jackets, 6 and 7 are optical fibers, and 8 to 10 are installed in the plug 2 at positions offset by a minute distance Δ from the center, and 4 and 5 are optical fiber jackets. Eccentric dies 11 to 13 each having a die hole having a diameter larger than the outer diameter of the fiber 6 by 2Δ are installed in the socket 3 at a position offset by a minute distance Δ from the center of the optical fiber 7 to be held.
14 is a cap nut for connecting the plug 2 and socket 3, 15 is a fixing metal fitting, 16 and 17 are bolts, 18 and 19 are nuts, 20 is an adhesive.

In the plug 2 and socket 3, eccentric dies 8 to 10 and 11 to 13, each having a die hole whose diameter is 2Δ larger than the outer diameter of the optical fibers 6 and 7, are located at a minute distance Δ from the center. The optical fibers 6 and 5 are firmly fitted in eccentric positions with different eccentric directions, and therefore, even if there is some manufacturing error, the optical fibers 6 and 5 can be easily inserted into the eccentric dies 8 to 10 and 11 to 13. It is easily inserted into the hole and is almost completely fixed at the center of the plug 2 and socket 3, so that the tips of the optical fibers 6 and 7 are positioned so that they correctly face each other and can be reliably connected. It is.

Further, the plug 2 and the socket 3 in which the eccentric dies 8 to 10 and 11 to 13 are accommodated are configured to be correctly coaxially connected by male and female pilots and a cap nut 14.

When the optical fibers 6 and 7 are connected by the optical fiber connector 1 according to the present invention, a predetermined length of the optical fibers 6 and 7 is exposed from the optical fiber jackets 4 and 5.

Thereafter, the optical fibers 6 and 7 are inserted into eccentric dies 8 to 1, which are firmly fitted into the plug 2 and the socket 3, respectively.
The optical fiber jackets 4 and 5 of each optical fiber 6 and 7 are inserted into the die holes O and 11 to 13, respectively, and fixed to the plug 2 and the socket 3, respectively.

For this fixing, an adhesive 20 is used in one embodiment, and a fixture 15 is used in another embodiment. In the former case, when the optical fiber 6 is inserted into the die holes of the eccentric dies 8 to 10 of the plug 2, the adhesive 20 is poured into the gap between the plug 2 and the optical fiber jacket 4, and the optical fiber jacket is inserted into the plug 2. 4 is fixed, and in the latter, the optical fiber jacket 5 is held in the socket 3 by the optical fiber jacket fixing part 3a and the fixing metal fitting 15, and the fixing part 3a and the fixing metal fitting 15 are tightened with bolts 16.17 and nuts 18.19. Fixed.

The plug 2 is fixed with the optical fiber 6 accurately positioned by the eccentric dies 8 to 1o, and the optical fiber 7 is fixed by the eccentric dies 11 to 13.
If the optical fibers 6 and 7 are connected to the socket 3, which is fixed with accurate positioning, using the spigot part and the cap nut 14, the optical fibers 6 and 7 may be misaligned, or there may be a problem between the two. Both optical fibers 6 and 7 can be reliably connected without creating a gap or bending the axis between them.

Next, FIG. 4 will be explained.

The curve shown in Fig. 4 has a core diameter of 150 μm,
3.2 dB/km optical fiber and core 8 (lcrm
Optical fibers with an outer diameter of 125 μm and a,s dB/km were connected using the optical fiber connector according to the present invention, and the connection loss was measured.Although the product of the present invention has an extremely simple structure, Regardless, connection loss substantially equivalent to that of conventional optical fiber connectors can be obtained.

〔Effect of the invention〕

Since the present invention has a ridge-like structure, the present invention has an extremely simple structure, and even an unskilled person can easily and reliably connect the optical fibers 6 and 7. Since the axes of the connector do not shift, there is no gap between the two end faces, and there is no possibility that the axes of the two are bent, connection loss can be kept to an extremely low level.

Note that the present invention is not limited to the embodiment on ridges. That is, for example, in this embodiment, the outer diameter of the optical fibers 6 and 7 is 2.0 mm inside the plug 2 and the socket 3. Three eccentric dies 8 to 10 and 1 each having a die hole larger in diameter by Δ
Although the eccentric dies 1 to 13 are eccentrically fitted and firmly fitted, the number of eccentric dies can be increased or decreased as appropriate depending on the shape and application of the optical fiber connector 1. Further, the method of fixing the optical fiber jackets 4 and 5 to the plug 2 and the socket 3 is not limited to the fixing method of the embodiment, and widely known fixing methods and fixing devices can be used. In addition, the shape of the optical fiber connector 1, the method of connecting the plug 2 and the socket 3, etc. can be freely changed within the scope of the purpose of the present invention, and the present invention does not encompass all of them. be.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the optical fiber connector according to the present invention, FIG. 2 is a front view in the direction A in FIG.
FIG. 3 is an enlarged sectional view of the optical fiber portion fixed by the eccentric die in the optical fiber connector, and FIG. 4 is a graph showing the connection characteristics of the optical fiber connector according to the present invention.

Claims (1)

[Claims] A pair of eccentric die holders, each having a die hole having a diameter 2Δ larger than the outer diameter of the optical fiber to be held at a position eccentric from the center by a minute distance Δ; A plurality of eccentric dies arranged in different eccentric directions are connected to the pair of eccentric die holders so that the cut ends of the optical fibers held by the pair of eccentric die holders face each other. An optical fiber connector consisting of a coupling tool.