JPH0594806U - Optical connector split sleeve - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention relates to a split sleeve that secures the pulling force when the connecting ferrules having slightly different outer diameters are fitted in the main body and is suitable for coaxial arrangement. It is possible to maintain the accuracy of coaxiality of the optical fiber by eliminating the positional deviation of the abutting parts of the connecting ferrules with different outer diameters according to different standards, and to obtain a sufficient removal force of the ferrule with a smaller outer diameter dimension. An object is to provide a split sleeve for an optical connector. [Structure] An elongated cylindrical main body 10a has a split 2 along its longitudinal direction on its peripheral surface, and is provided in a connected ferrule 3 provided in a connected optical fiber terminal and in a connected optical fiber terminal. The split sleeve 10 is inserted into the main body so that the connection ferrules 4 to be connected to each other are butted against each other.
In the above, the concave groove 11 having a desired width is provided on the inner peripheral surface of the main body at the abutting portions of the abutted ferrules.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a split sleeve that is suitable for coaxially arranging a connecting ferrule having a slightly different outer diameter when the connecting ferrule is fitted in a main body, and is secured.

[0002]

[Prior Art]

 Conventionally, as shown in FIG. 5 and FIG. 6, a split sleeve 1 of this type of optical connector has a body 1a having an elongated cylindrical shape and a uniform width along the longitudinal direction of the body 1a having a straight and uniform cross section. It is formed with a crack 2. Then, as shown in FIG. 5, the connecting ferrules 3 and 4 are fitted in from the left and right direction of the split sleeve 1 and the end faces 3a and 4a are brought into contact with each other so that the optical fibers of the ferrules 3 and 4 are connected. They were connected to each other for optical communication.

[0003]

[Problems to be solved by the device]

 However, in the split sleeve 1 of the optical connector according to the above-mentioned conventional example, when the standards of the ferrules 3 and 4 to be fitted therein are slightly different, for example, a ferrule having an outer diameter of 2.499 mm to 2.5 mm which conforms to the American standard. 3 and outer diameter according to Japanese Industrial Standards 2. When the ferrule 4 having a diameter of 499 mm ± 0.5 μ is inserted into the main body 1a and connected, the ferrule 3 with a larger outer diameter comes into close contact with the inner peripheral surface of the main body 1a to expand the main body 1a. Although a sufficient pulling force can be obtained by tightening force by force, the thinner ferrule 4 is loosely fitted to the inner peripheral surface of the main body 1a due to the expansion of the main body 1a, and a sufficient pulling force is obtained. Sometimes you can't get it. Further, there is a problem that the ferrule 4 is tilted due to the expansion of the main body 1a of the split sleeve 1 and the precision of the coaxiality of the optical fibers 5 and 5 of both ferrules 3 and 4 is deteriorated.

In view of such conventional problems, an object of the present invention is to eliminate the positional deviation of the abutting portions of the connecting ferrules having different outer diameters according to different standards to maintain the accuracy of the coaxiality of the optical fiber. Another object of the present invention is to provide a split sleeve for an optical connector that can sufficiently obtain the pulling force of a ferrule with a smaller outer diameter.

[0005]

[Means for Solving the Problems]

 The gist of the present invention for solving the above problems and achieving the object is to provide a main body having an elongated cylindrical shape with a split along the longitudinal direction at the peripheral surface thereof and to be provided in an optical fiber terminal on the connected side. In the split sleeve in which the connection ferrule and the connection ferrule provided on the optical fiber terminal on the connection side are butted against each other and inserted into the main body, the split sleeve is provided on the inner peripheral surface of the main body at the abutting position of both butted ferrules. The purpose is to provide a groove with the desired width.

[0006]

[Action]

 According to the split sleeve of the optical connector of the present invention, when two ferrules having slightly different outer diameters are inserted into the body of the split sleeve, the ferrule with the larger outer diameter is inserted. The stress caused by the expansion of the main body portion deforms the thin portion in the concave groove, and the widening deformation of the main body portion in which the ferrule having a smaller outer diameter is inserted is relaxed. In this way, the deformation stress that expands the main body of the split sleeve is significantly smaller than the conventional one with the groove as the boundary, and it is prevented that the fitting with the ferrule with a smaller outer diameter dimension becomes unfavorable. Power is maintained. Further, since the expansion deformation of the main body portion into which the ferrule having a smaller outer diameter is inserted is relaxed, the coaxiality of the optical fiber of the ferrule having a different diameter can be maintained with high accuracy.

[0007]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an enlarged vertical sectional view showing an essential part of a split sleeve of an optical connector according to an embodiment of the present invention in which both ferrules are fitted to the inner periphery of the split sleeve. FIG. 2 is a vertical sectional view showing the split sleeve. Is also a central cross-sectional view thereof. For ease of understanding, the parts corresponding to the conventional example are given the same reference numerals.

As shown in FIG. 2, the split sleeve 10 of the optical connector according to the present invention has an elongated cylindrical phosphor bronze (or zirconia) main body 10a, and its circumferential surface along the longitudinal direction. And has a crevice 2, and is formed by providing a concave groove 11 having a predetermined dimension width W and continuous along the circumferential direction of the inner surface at a substantially central portion of the main body 10a.

The width W of the groove 11 is about 0.8 to 1 mm. Further, the depth of the recessed groove 11 is properly designed according to the degree of withdrawal force. The main body 10a has an overall length of 11.4 mm, an outer diameter of about 3.2 mm and an inner diameter of 2.49 mm.

FIG. 4 is a semi-cutaway front view showing the shape of the connecting ferrule 20. If the connecting ferrule 20 is an American standard, its outer diameter is set to 2.499 mm to 2.5 mm, and if it is a Japanese industrial standard, its outer diameter is 2.499 mm ± 0. It is set to 5 μ. In the figure, reference numeral 5 indicates an optical fiber.

When the split sleeve 10 according to the present invention formed as described above is used by being provided in an adapter or connector for connecting an optical fiber in optical communication, as shown in FIG. Insert the connected ferrule 3 (the one with the larger outer diameter) and the connecting ferrule 4 (the one with the smaller outer diameter) from the left and right. Then, the left half of the main body 10a in which the connected ferrule 3 is inserted is tightly fitted, and the split 2 of the main body 10a is slightly expanded.

The thin portion 12 of the recessed groove 11 is elastically deformed by expanding the left half of the main body 10a. The deforming force is absorbed by the thin portion 12 and the connecting ferrule 4 is inserted into the main body. It has little effect on the right half of 10a. Therefore, the withdrawal force of the connecting ferrule 4 does not decrease below the allowable value, and the axes of the optical fibers 5 and 5 are kept coaxial. In this way, with the split sleeve of the present invention, even if ferrules of different diameters are butted and fitted together, the influence that expands the sleeve body of one ferrule is cut off by the groove in the sleeve body. Is.

The present invention is not limited to the above embodiment, and the same effect can be obtained even when the outer diameter of the connected ferrule 3 is smaller than the outer diameter of the connecting ferrule 4. Of course, the concave groove 11 can be provided on the outer surface side instead of the inner surface of the split sleeve body 10a, and various modifications can be made without departing from the scope of the invention.

[0014]

[Effect of the device]

 The present invention is configured as described above, and in the split sleeve, since the inner peripheral surface of the main body at the abutting portion of the connecting ferrule that is butted and inserted into the main body is provided with the concave groove of the desired width, The influence of expanding the split sleeve body of a ferrule with a different diameter is blocked by this groove, and does not reach the split sleeve body where the ferrule with a smaller outer diameter is inserted. It is possible to secure sufficient removal force for the thinner ferrule. In addition, the coaxiality of both ferrules fitted in the split sleeve body is maintained with high accuracy, and there is an excellent effect that no positional deviation occurs.

[Brief description of drawings]

FIG. 1 is an enlarged vertical cross-sectional view showing a main part in a state where both ferrules are fitted in a split sleeve of an optical connector according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view showing a split sleeve according to an embodiment of the present invention.

FIG. 3 is a central cross-sectional view showing a split sleeve according to an embodiment of the present invention.

FIG. 4 is a front view showing a connection ferrule partially broken away.

FIG. 5 is a vertical sectional view showing a conventional split sleeve.

FIG. 6 is a side view showing a conventional split sleeve.

[Explanation of symbols]

10 split sleeves, 10a split sleeve body, 1
1 groove, 12 thin portion, W width of groove.

Claims (1)

[Scope of utility model registration request] 1. An elongated cylindrical main body having a split along its longitudinal direction on its peripheral surface, and provided on a ferrule to be connected provided on an optical fiber terminal on the connected side and an optical fiber terminal on the connected side. A split sleeve in which a connecting ferrule is butted against each other and fitted into the main body, wherein a concave groove having a desired width is provided on an inner peripheral surface of the main body at an abutting portion of the butted ferrules. Optical connector split sleeve.