JPH04130907U - grooved ferrule - Google Patents

Abstract

(57) [Summary] [Purpose] In ferrule processing, the outer periphery can be processed with high precision in a short time, and in addition, dust can be removed from the outer periphery of the ferrule.
The purpose is to provide a ferrule that has the effect of removing air and reducing insertion/extraction force. [Structure] A grooved ferrule in which a groove is provided on the outer periphery of the ferrule 1, and the groove may be, for example, a plurality of grooves that go around the outer periphery of the ferrule 1, or a groove provided on the outer periphery of the ferrule 1 from the tip end surface to the rear end surface. The ferrule is a grooved ferrule with a spiral groove formed on the ferrule 1, or a linear groove formed on the outer periphery of the ferrule 1 from the front end surface to the rear end surface.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a ferrule used in an optical communication connector.

0002

[Prior art and its problems]

As shown in Figure 4, the conventional ferrule has a straight outer periphery, and due to its characteristics, The dimensional accuracy of the outer circumference is extremely strict, with an outer diameter of 2.499±0.0005mm and a perfect circle. Extremely high periphery machining accuracy of within 0.001 mm and straightness of 0.001 mm is required. be done.

0003 However, when machining the outer periphery, if the outer periphery of the ferrule is straight, The machining area is large, and therefore, the outer periphery machining time is required to be longer due to the larger area. Add more The wider the machining surface, the more variation will occur in machining accuracy, so eliminate this variation. Therefore, it takes an even longer time to process the outer periphery.

0004 Also, when connecting the ferrule, it may adhere to the split sleeve or precision sleeve. If dirt, abrasion powder, etc. from use land on the optical connection surface, light will not pass through and connection loss will occur. Furthermore, in the case of precision sleeves, the hole insertion gap is on the order of submicrons, so air can be extracted. Otherwise, the optical connection surface will move apart due to piston movement, resulting in poor connection loss. There are also issues such as mau.

[0005] In order to solve the above problems, this invention achieves high machining accuracy even in short time machining. In addition, the outer periphery of the ferrule has effects such as removing dust, venting air, and reducing insertion/extraction force. The purpose of this invention is to provide a ferrule with effective results.

[0006]

[Means to solve the problem]

In order to solve the above problem, the present invention uses a grooved ferrule with a groove on the outer periphery. This groove is, for example, a groove that goes around the outer circumference of the ferrule, or a groove that goes around the outer circumference of the ferrule. A spiral groove provided on the outer periphery of the ferrule extending from the front end surface to the rear end surface of the ferrule, Alternatively, a linear groove may be formed on the outer circumference of the ferrule from the tip to the rear end of the ferrule. There are several.

[0007]

【Example】

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of the present invention, in which grooves 2a and 2b run around the outer periphery of a ferrule 1. , 2c are provided.

[0008] In this example, the grooves 2a, 2b, 2c are removed from the outside of the ferrule 1 when the ferrule 1 is attached or removed. Serves as a place for dirt and dust attached to the periphery to escape, preventing fluctuations in the connection characteristics of the connector. can. Furthermore, grooves 2a, 2b, and 2c connect the outer circumference of the ferrule 1 and the sleeve. Since the contact area becomes smaller, the insertion/extraction force is reduced.

[0009] In addition, in the manufacturing process, after sintering the straight ferrule, grooves are processed on the outer periphery. Polish the outer periphery. Groove machining is a simple process that goes around the outer circumference, so it can be done easily in a short time. Wear. Furthermore, after creating the groove, the outer periphery is polished, so the machining area is small and the outer periphery is polished in a short time. Peripheral polishing can be performed. In this case, the machining area for outer periphery polishing is small, so there may be variations in machining accuracy. There are fewer scratches, and the extra processing time that was previously required to eliminate this variation is required. I don't.

0010 In this way, single mode fiber processing can be performed with extremely high precision in a short period of time. Even for products that require high outer diameter accuracy, such as ferrules for bar connections, the yield is high. Can be manufactured cheaply.

[0011] Note that this type of ferrule has an air vent groove that extends from the tip to the rear end of the ferrule. By providing this, the insertion/extraction force can be further reduced.

0012 FIG. 2 shows a second embodiment of the present invention, in which the outer periphery of the ferrule 1 extends from the tip end surface to the rear end surface. A spiral groove 3 is provided.

[0013] In the case of this type, the groove 3 extends spirally from the distal end surface to the rear end surface, so it is outside the ferrule. It serves as a place for dirt and dust attached to the periphery to escape, allowing stable connection characteristics to be maintained. difference In addition, the groove 3 has an air venting function, and the groove 3 connects the outer circumference of the ferrule 1 with the slot. Since the contact area with the rib becomes smaller, the insertion/extraction force is reduced.

[0014] In addition, the manufacturing process is similar to the above, after sintering a straight ferrule, grooves are formed on the outer periphery. The outer periphery is polished. Therefore, the outer periphery can be polished in a short time, and the polishing can be done with high accuracy. We can manufacture ferrules.

[0015] FIG. 3 shows a third embodiment of the present invention, in which the outer periphery of the ferrule 1 extends from the tip surface to the rear end surface. A plurality of linear grooves 4 are provided at equal intervals or randomly.

[0016] In the case of this type, the plurality of grooves 4 extend from the distal end surface to the rear end surface as in the second embodiment. This makes it a stable place for dirt and dust attached to the ferrule to escape and for air to escape. connection characteristics can be maintained. In addition, similarly to the above, the groove 4 has the function of venting air, In addition, since the contact area between the outer periphery of ferrule 1 and the sleeve becomes smaller, the insertion/extraction force is reduced. decreases.

[0017] In addition, the manufacturing process allows grooves to be created at the same time as the molding process, so it is possible to create grooves immediately after sintering. Then polish the outer periphery. Therefore, since there is no groove machining after sintering, machining can be done in a shorter time. As a result, ferrules can be manufactured with high precision in the same way as described above.

[0018]

[Effect of the idea]

Since the present invention is configured as described above, the machining time for the outer periphery is shortened, and the machining time is reduced. The machining accuracy is good even in a short time, and the grooves on the ferrule's outer periphery are easy to adhere to. It serves as a place for dirt and debris to escape, and as an air vent to maintain stable connection characteristics. Since the contact area between the ferrule outer circumference and the sleeve is smaller, the insertion/extraction force is reduced. do. Furthermore, since it can be processed with high precision in a short time, it is suitable for single mode fiber connection. Even items that require extremely high precision, such as ferrules, can be manufactured quickly and at low cost. can.

[Brief explanation of drawings]

FIG. 1 is a side view of a ferrule showing a first embodiment of the present invention.

FIG. 2 is a side view of a ferrule showing a second embodiment of the present invention.

FIG. 3 is a side view of a ferrule showing a third embodiment of the present invention.

FIG. 4 is a cross-sectional view of a conventional ferrule.

[Explanation of symbols]

1: Ferrule 2a, 2b, 2c, 3, 4 groove

Claims (4)

[Scope of utility model registration request] 1. A grooved ferrule characterized in that a groove is provided on the outer periphery of the ferrule. 2. The grooved ferrule according to claim 1, further comprising a plurality of grooves extending around the outer periphery of the ferrule. 3. The grooved ferrule according to claim 1, wherein a spiral groove is provided on the outer periphery of the ferrule, extending from the front end surface to the rear end surface of the ferrule. 4. The grooved ferrule according to claim 1, wherein a plurality of linear grooves are provided on the outer circumference of the ferrule, extending from the front end surface to the rear end surface of the ferrule.