JP2008033243A - Split sleeve and optical receptacle using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve stability of pull-off force which is a basic property of a split sleeve. <P>SOLUTION: The split sleeve is formed of a tube body 3 having a slit 1 in the axial direction and a through-hole 2 into which a ferrule is inserted, wherein the tube body 3 is made thinner in the slit counter part 3a opposed to the slit 1 across the through-hole 2 compared with other parts. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a split sleeve used in an optical connector for connecting ferrules through which an optical fiber is inserted, and an optical receptacle including the split sleeve.

  2. Description of the Related Art In recent years, optical communication using an optical fiber has been used with an increase in the amount of information in information communication. In this optical communication, a cylindrical ferrule that holds the optical fiber with a through hole is used to connect the optical fibers.

  As shown in FIG. 4, the structure of the optical connector for connecting the optical fibers is such that the ferrules 21 into which the optical fibers 22 are inserted are inserted from both ends of the split sleeve 23 and abutted against each other, thereby being inserted into the ferrule 21. 22 are connected to each other. As the material of the ferrule 21 and the split sleeve 1, for example, ceramics or glass such as alumina or zirconia is used.

As shown in FIG. 5, the split sleeve 23 is formed of a cylindrical body having a uniform thickness and is provided with a slit 24 in the longitudinal direction so that the through hole is slightly smaller than the outer diameter of the ferrule 21. Precision polished. In this split sleeve 23, the slit facing portion 23a facing the slit 24 across the through hole of the split sleeve 23 is elastically deformed. Therefore, when the ferrule 21 is inserted, the diameter of the split sleeve 23 increases and By the action of the force returning to the shape, the ferrule 21 can be firmly held on the inner peripheral surface of the split sleeve 23 (see, for example, Patent Document 1).
JP-A-2-231545

  In such a split sleeve, a ferrule inserted through an optical fiber is inserted and removed many times. For this reason, when the split sleeve is used for a long period of time, wear occurs at the sliding portion between the ferrule and the split sleeve to generate minute wear powder, and there is a problem that the wear powder is interposed between the ferrule and the split sleeve. It was. Furthermore, depending on the usage environment of the optical connector, there may be a case where minute dust in the air is interposed between the ferrule and the split sleeve.

  Therefore, in the conventional split sleeve 23, when such wear powder or dust is interposed between the split sleeve and the ferrule, the diameter of the split sleeve is greatly widened by the amount of wear powder or dust, and inserted into the split sleeve 23. There has been a problem that the force (extraction force) required when extracting the ferrule 21 varies and the extraction force becomes unstable.

  The present invention has been made in view of the above problems, and is a split sleeve including a cylindrical body having a slit in an axial direction and having a ferrule inserted into a through-hole. The thickness of the slit facing portion facing the slit across the hole is thinner than other portions.

  Moreover, in this invention, the thickness of the said cylinder is gradually thickened toward the said slit from the said slit opposing part.

  Further, in the present invention, a recess is provided on at least one of the inner peripheral surface and the outer peripheral surface of the cylindrical body of the slit facing portion to make the thickness of the slit facing portion thinner than the thickness of the other part of the cylindrical body. It is characterized by that.

  In the present invention, the concave portion is filled with a resin having a smaller elastic modulus than that of the cylindrical body.

  In the present invention, the bottom surface part formed so that the thickness of the slit opposing part may be thinner than the thickness of the other part of the cylindrical body is provided on the outer peripheral surface of the cylindrical part of the slit opposing part. Features.

  In the present invention, the slit facing portion is provided with a hole portion penetrating from the inner peripheral surface to the outer peripheral surface of the cylindrical body.

  Furthermore, in the present invention, the hole is characterized in that a width in a direction orthogonal to a longitudinal direction of the cylindrical body is larger than a width in the longitudinal direction.

  Furthermore, in the present invention, the holes are provided at equal intervals along the longitudinal direction of the cylindrical body.

  The optical receptacle of the present invention is optically coupled to the split sleeve of the present invention, one end of which is held in a through hole on one end side of the split sleeve, and a plug inserted from the other end side of the split sleeve. A fiber stub having an optical fiber and a holder that holds the other end of the fiber stub are provided.

  According to the split sleeve and the optical receptacle of the present invention, in the cylindrical body constituting the split sleeve, the thickness of the slit facing portion facing the slit across the through hole is smaller than that of the other portion, so that the slit facing The rigidity of the cylindrical body in the part can be reduced. As a result, in the present invention, the removal force of the split sleeve can be reduced even if wear powder or dust is interposed between the inner peripheral surface of the cylinder and the outer peripheral surface of the ferrule. It is possible to reduce and realize the stabilization of the extraction force.

  In the present invention, if the thickness of the cylindrical body is gradually increased from the slit facing portion toward the slit, the rigidity at the slit facing portion can be reduced and the strength of the cylindrical body in the vicinity of the slit can be improved. In addition, it is possible to suppress variation in the extraction force and prevent damage in the vicinity of the slit due to insertion of a ferrule.

  In the present invention, if a recess for making the thickness of the slit facing portion thinner than the thickness of the other portion of the cylinder is provided on the inner peripheral surface of the cylinder in the slit facing portion, the recess is formed simultaneously with the slit forming process. Therefore, the manufacturing process is simplified.

  Further, in the present invention, if a concave portion for making the thickness of the slit facing portion thinner than the thickness of the other portion of the cylindrical body is provided on the outer peripheral surface of the cylindrical body in the slit facing portion, the slit is formed after the concave portion is formed. When processing, since a slit formation part can be determined by a recessed part, slit formation processing becomes easy.

  Furthermore, if the recess is filled with a resin having a smaller elastic modulus than that of the cylindrical body, the rigidity of the cylindrical body can be reduced and the slit facing portion having a reduced thickness can be reinforced, thereby increasing the strength of the split sleeve. Can do.

  Further, according to the present invention, if the bottom surface part formed so that the thickness of the slit facing part is thinner than the thickness of the other part of the cylindrical body is provided on the outer peripheral surface of the cylinder in the slit facing part, When the slit forming process is performed after the bottom surface part is formed, the slit forming process can be easily performed because the slit forming part can be determined by the bottom surface part.

  Also, in the present invention, if the slit facing portion is provided with a hole penetrating from the inner peripheral surface to the outer peripheral surface of the cylindrical body, the rigidity at the slit facing portion can be easily reduced, and the above-mentioned wear powder and Since dust can be discharged to the outside from the hole, the removal force can be further stabilized.

  Furthermore, in the present invention, if the width of the hole portion in the direction orthogonal to the longitudinal direction of the cylinder is larger than the width in the longitudinal direction of the cylinder, the ferrule and the cylinder inserted along the longitudinal direction of the split sleeve The abrasion powder generated by the sliding of the body can be efficiently discharged from the hole by the operation of inserting and removing the ferrule. In particular, if the holes are provided at equal intervals along the longitudinal direction of the cylindrical body, the rigidity can be controlled substantially uniformly over the longitudinal direction of the split sleeve, so that the removal force can be stabilized efficiently. it can.

  A first embodiment of the split sleeve of the present invention will be described below with reference to FIG. FIG. 1 is a cross-sectional view of a split sleeve X1 according to the first embodiment of the present invention. The split sleeve X1 according to an embodiment of the present invention includes a cylindrical body 3 having a slit 1 in the axial direction and a ferrule inserted into the through hole 2.

  The cylinder 3 has a function of holding a ferrule (not shown) having an optical fiber inserted from the opening of the through hole 2, and the ferrules inserted from the openings at both ends of the through hole 2 are inserted into the through holes. The optical fibers of the ferrule are optically coupled with each other by abutting within the two.

  The shape of the cylindrical body 3 is not particularly limited as long as it has the through hole 2 capable of holding the ferrule. For example, the cylindrical body 3 is configured by a cylindrical body or a prismatic body having a through hole (triangular prism, square pillar, etc.). The

The cylindrical body 3 can be made of, for example, a metal such as phosphor bronze, beryllium copper, brass or stainless steel, a plastic such as an epoxy resin or a liquid crystal polymer, or a ceramic such as alumina or zirconia. In such a material, it is preferable to form the cylinder 3 with zirconia ceramics. Specifically, partially stabilized zirconia ceramics mainly composed of tetragonal crystals containing ZrO ₂ as a main component, Y ₂ O ₃ , CaO, MgO, CeO ₂ , and Dy ₂ O ₃ as stabilizers. It is. Such partially stabilized zirconia ceramics have excellent wear resistance and moderately elastically deform, so that even if the ferrule is inserted and removed many times, it is not easily damaged.

  The through hole 2 of the cylindrical body 3 is formed slightly larger than the outer diameter of the ferrule to be inserted. For this reason, when the ferrule is inserted into the through hole 2 of the cylindrical body 3, the inner diameter of the cylindrical body 3 (the diameter of the through hole) is increased. Specifically, the cylindrical body 3 is elastically deformed so that the width of the slit 1 is widened by using a portion facing the slit 1 (hereinafter referred to as a slit facing portion 3a) across the through hole 2 as a fulcrum. The inner diameter of the body 3 is enlarged. The cylindrical body 3 whose inner diameter is enlarged by elastic deformation firmly holds the ferrule by the force of returning to the original shape. Here, when extracting the ferrule held by the cylindrical body 3, it is necessary to apply a force larger than the force of the cylindrical body 3 to return to the original shape, and this force is called an extraction force. is there. The removal force can be regarded as the same force as the cylindrical body 3 returns to the original shape, and is therefore proportional to the amount by which the inner diameter of the cylindrical body 3 is expanded. That is, when the difference between the outer diameter of the ferrule and the inner diameter of the cylindrical body 3 is large, the amount of expansion of the cylindrical body 3 when the ferrule is inserted into the cylindrical body 3 is increased, and the extraction force is increased.

  This extraction force depends on the elastic force obtained from the elastic modulus, wall thickness, and the like of the cylindrical body 3. More precisely, since this elastic deformation occurs with the slit facing portion 3a as a fulcrum, the removal force depends on the elastic force of the slit facing portion 3a. The elastic force of the slit facing portion 3a depends on the rigidity of the slit facing portion 3a. That is, when the rigidity of the slit facing portion 3a is strong, if the amount of expansion is increased, a very large force is required to expand the expansion amount, so that the extraction force increases. On the other hand, when the rigidity of the slit facing portion 3a is weak, even if the amount of expansion is increased, the force to return to the original shape is weaker than that when the rigidity is strong, so the increase amount of the extraction force decreases.

  Generally, a split sleeve is used such that a ferrule inserted through an optical fiber is frequently inserted and pulled out. In such repeated insertion / extraction, minute wear powder is formed between the outer peripheral surface of the ferrule and the inner peripheral surface of the cylindrical body by the wear of the inner peripheral surface of the cylindrical body constituting the split sleeve and the outer peripheral surface of the ferrule. May intervene.

  If the ferrule is inserted into the split sleeve in the presence of such wear powder, the split sleeve has to be expanded by the volume of the wear powder, so that the removal force increases. That is, if such wear powder exists, the removal force fluctuates and the removal force of the split sleeve becomes unstable. Since the fluctuation of the extraction force depends on the rigidity of the slit facing part of the cylindrical body constituting the split sleeve, the force to return to the original increases when the rigidity is strong. Due to the large fluctuation, the removal force becomes unstable.

  Therefore, in the present invention, the rigidity of the cylindrical body 3 in the slit facing portion 3a is reduced by configuring the slit facing portion 3a of the cylindrical body 3 to be thinner than the other portions. As a result, in the present invention, even if wear powder or dust is interposed between the inner peripheral surface of the cylinder 3 and the outer peripheral surface of the ferrule, the increase in the removal force of the split sleeve X1 can be reduced. It is possible to stabilize the removal force by reducing the variation of the removal force. Such a configuration of the present invention does not reduce the overall thickness (thickness) of the cylindrical body 3, but only the slit facing portion 3a serving as a fulcrum of elastic deformation. The removal force can be stabilized without unduly reducing the mechanical strength.

  Furthermore, if the thickness (thickness) of the cylindrical body 3 is gradually increased from the slit facing portion 3a toward the slit 1, the rigidity at the slit facing portion can be reduced and the cylindrical body 3 in the vicinity of the slit 1 can be reduced. Since the strength can be improved, it is possible to suppress the variation in the extraction force and to prevent breakage in the vicinity of the slit 1 due to the insertion of the ferrule.

  Next, another embodiment according to the split sleeve of the present invention will be described with reference to FIG. 2A to 2F are cross-sectional views of a split sleeve according to another embodiment of the present invention.

  As shown in FIG. 2A, the split sleeve X2 according to the second embodiment of the present invention has a thickness of the slit facing portion 3a on the inner peripheral surface of the cylindrical body 3 of the slit facing portion 3a. A recess 3b is provided to make it thinner than the thickness of this portion. In the second embodiment, for example, when the slit 1 is formed using a disk-shaped diamond grindstone, the recess 3b can be formed simultaneously with the formation of the slit 1, so that the recess 3b can be formed with high positional accuracy and manufactured. The process becomes simple.

  As shown in FIG. 2 (b), the split sleeve X3 according to the third embodiment of the present invention has a thickness of the slit facing portion 3a on the outer peripheral surface of the cylindrical body 3 of the slit facing portion 3a. A recess 3b is provided to make it thinner than the thickness of the portion. In the third embodiment, when the slit forming process is performed after forming the recessed part 3b, the forming part of the slit 1 can be determined by the recessed part 3b, so that the forming process of the slit 1 is facilitated. In addition, you may provide the recessed part 3b in both the inner peripheral surface and outer peripheral surface of the slit opposing part 3a.

  Further, as shown in FIG. 2 (c), the split sleeve X4 according to the fourth embodiment of the present invention has a smaller elastic modulus than the cylindrical body 3 in the recess 3b in the above-described split sleeve X2 and X3 embodiment. Resin 4 is filled. In the fourth embodiment, the rigidity of the cylindrical body 3 can be increased because the rigidity of the cylindrical body 3 can be reduced and the slit facing portion 3a having a reduced thickness (wall thickness) can be reinforced. As such a resin 4, when the cylinder 3 is formed of ceramics such as alumina or zirconia, or metal, for example, epoxy resin, acrylic resin, LCP (liquid crystal polymer resin), PBT (polybromoterphenyl) PET (polyethylene) Resin such as terephthalate) can be used.

  In the split sleeve X4 according to the fourth embodiment of the present invention, the thickness of the cylindrical body 3 in the slit facing portion 3a is equal to that of the other portions except the slit facing portion 3a by filling the recess 3b with resin. ing. However, in the present invention, for example, if the cylindrical body 3 is made of ceramics, it is sufficient if the thickness of the ceramics is reduced at the slit facing portion 3a. Accordingly, when another member is provided on the outer peripheral portion of the cylindrical body 3 with respect to the cylindrical body 3 having a different thickness (thickness is small at the slit facing portion 3a) as in the fourth embodiment of the present invention, the thickness of the cylindrical body 3 is increased. However, even in such a form, if the resin is set to be smaller than the elastic modulus of the material constituting the cylindrical body 3, the rigidity of the slit facing portion 3a can be reduced. .

  Further, as shown in FIG. 2D, the split sleeve X5 according to the fifth embodiment of the present invention has a thickness of the slit facing portion 3a on the outer peripheral surface of the cylindrical body 3 of the slit facing portion 3a. A bottom surface portion 3c formed so as to be thinner than other portions is provided. In the fifth embodiment, when the slit forming process is performed after the bottom surface part 3c is formed, the forming part of the slit 1 can be determined by the bottom surface part 3c.

  As shown in FIG. 2 (f), the split sleeve X6 according to the sixth embodiment of the present invention is provided with a hole 3d penetrating from the inner peripheral surface of the cylindrical body 3 to the outer peripheral surface in the slit facing portion 3a. Yes. In the sixth embodiment, since the hole 3d is provided, the rigidity in the slit facing portion 3a can be easily reduced, and wear powder generated by sliding between the cylinder 3 and the ferrule, Since the dust that enters more can be discharged to the outside from the hole 3d, the removal force can be further stabilized. Further, the hole 3d in the split sleeve X6 can be formed by, for example, a drill provided with a diamond tip at the tip. The shape of the hole 3d is not limited to the circular shape as shown in FIG. 2F, and may be a polygonal shape such as a triangular shape or a quadrangular shape.

  Further, in the split sleeve X6 ′, which is a modified example of the sixth embodiment of the present invention, as shown in FIG. 2 (e), the hole 3d ′ provided in the slit facing portion 3a has a longitudinal direction of the cylindrical body 3. The width in the orthogonal direction was made larger than the width in the longitudinal direction of the cylinder 3. In such a split sleeve X6 ′, the wear powder generated by sliding between the ferrule inserted along the longitudinal direction of the split sleeve X6 ′ and the cylindrical body 3 is efficiently discharged from the hole 3d ′ by the operation of inserting and removing the ferrule. Can do. Further, the hole 3d 'in the split sleeve X6' can be formed by, for example, rotating a disk-shaped diamond tool at a high speed and pressing it against a desired position of the slit facing portion 3a. In this case, the surface of the disk is adjusted so as to be substantially perpendicular to the longitudinal direction of the split sleeve.

Further, in the sixth embodiment of the present invention and the split sleeves X6 and X6 ′ which are the modifications thereof, if the holes 3d are provided at equal intervals along the longitudinal direction of the cylindrical body 3, the longitudinal direction of the split sleeve Since the rigidity can be controlled almost uniformly, the removal force can be stabilized efficiently.

  Next, the manufacturing method of the split sleeve of this invention is demonstrated. As a manufacturing method of the split sleeve X1, first, the cylindrical body 3 is manufactured. For example, when the cylindrical body 3 made of zirconia ceramics is formed, the cylindrical body 3 is prepared in advance by a predetermined molding method such as injection molding, press molding, extrusion molding, etc. Baking is performed at 1300 to 1500 ° C., and grinding or polishing is performed to a predetermined dimension. In this manufacturing method, a predetermined shape may be formed in advance on the formed body by cutting or the like, and then fired.

  Here, in order to reduce the thickness (thickness) of the slit facing portion 3a of the cylindrical body 3, when adjusting in the molding process, for example, in the case of extrusion molding, a pin (not shown) for forming the through hole 2 is provided. What is necessary is just to arrange | position eccentrically from the center of an extrusion mold. Thereby, since the through-hole of the molded body obtained by the extrusion molding method can be eccentric with respect to the outer periphery, the thickness of the molded body can be partially reduced. Then, after the obtained molded body is fired as described above, the split sleeve X1 can be manufactured by performing the process of forming the slit 1 so that the partially thinned portion becomes the slit facing portion 3a. . Moreover, what is necessary is just to grind and process a predetermined part, for example with a diamond grindstone etc., in order to make the thickness (thickness) of the slit opposing part 3a of the cylinder 3 thin after sintering.

  As the slit 1, for example, a disk-shaped diamond grindstone having a thickness corresponding to a predetermined slit width is used. The diamond grindstone can be formed by pressing in parallel with the central axis of the cylinder 3 fixed with hot melt wax or the like while rotating the diamond grindstone.

  Moreover, when manufacturing the cylinder 3 with plastics, a predetermined metal mold | die is prepared and it can manufacture by injection molding etc. On the other hand, when the cylindrical body 3 is made of a metal material, it can be manufactured by processes such as electroforming, lathe processing, press processing, and grinding processing.

  Next, a receptacle using the split sleeve of the present invention will be described with reference to FIG. A receptacle Y according to an embodiment of the present invention includes a fiber stub 10 in which an optical fiber 10b is fixed to a through-hole of a ferrule 10a, and a distal end portion of the fiber stub 10 is inserted from one open end, and the other open end The split sleeve X1 and split sleeve X1 of the present invention for inserting the distal end side of a plug (not shown) formed of a ferrule holding an optical fiber from the portion into contact with and gripping the distal end portion of the fiber stub 10 And a holder 12 for holding the fiber stub 10. Such a receptacle Y can realize stabilization of the extraction force of the split sleeve.

The ferrule 10a protects the optical fiber 10b, and is a member for coordinating the central axis of the fiber stub 10 and the central axis of the plug ferrule (not shown) in cooperation with the split sleeve X1, for example, a cylindrical shape. It is made. Ferrule 10a is composed of a simple substance such as zirconium oxide (zirconia), aluminum oxide (alumina), mullite, silicon nitride, silicon carbide, and aluminum nitride, ceramics containing these as main components, and glass ceramics such as crystallized glass. , Metal such as phosphor bronze, beryllium copper, brass, stainless steel, plastics such as epoxy and liquid crystal polymer, etc. Among them, zirconia-based ceramics (ceramics mainly composed of zirconia) excellent in weather resistance and toughness are preferable. It is. Among zirconia-based ceramics, in particular, at least one selected from the group consisting of zirconium oxide (ZrO ₂ ) as a main component and Y ₂ O ₃ , CaO, MgO, CeO ₂ , Dy ₂ O _{3 and the} like is used as a stabilizer. Partially stabilized zirconia ceramics (mainly tetragonal crystals) are included as a more preferable material from the viewpoints of wear resistance and elastic deformation.

  The optical fiber 10b is for propagating light. Examples of the optical fiber 10b include a quartz optical fiber, a plastic optical fiber, and a multicomponent glass optical fiber.

  Since the shell 11 and the holder 12 are often welded to a case for storing an optical element or the like as an optical module, materials that can be welded such as stainless steel, copper, iron, and nickel are used. Stainless steel is used in consideration of weldability.

  In this example, a predetermined number of ferrule insertion / extraction tests were performed using the split sleeve X1 according to the first embodiment of the present invention, and the stability of the extraction force was verified.

  Below, the manufacturing method of the split sleeve X1 of a present Example is demonstrated. First, zirconia clay obtained by mixing zirconia raw material powder and a binder is formed through an extrusion mold (not shown). At this time, since the pins for forming the through holes accommodated in the extrusion mold are eccentrically arranged at positions shifted from the center in the mold, the through holes of the obtained molded body Is molded out of its axis. Thereafter, the molded body was dried, and then fired at a firing temperature of about 1500 ° C. to produce a cylindrical body 3. Next, the cylinder 3 is fixed with hot melt wax on the substrate provided with the V-groove, and a disk-shaped diamond grindstone having a width of 0.5 mm is brought into contact with the region where the thickness of the cylinder 3 is the largest. By forming slits 1, split sleeve X 1 was produced. The diameter of the through-hole 2 of the split sleeve X1 was about φ2.496 mm, the outer diameter of the split sleeve X1 was φ3.20 mm, and the eccentricity with respect to the outer diameter of the through-hole 2 was about 0.05 mm. The thickness of the cylinder 3 in the vicinity of the slit 1 was about 0.4 mm, and the minimum thickness of the cylinder 3 in the slit facing portion 3a was 0.3 mm.

  As a comparative example, a split sleeve made of a sintered body made of a molded body obtained by placing a pin of an extrusion mold at the center of the mold was produced. The thickness of this split sleeve was about 0.35 mm throughout and was formed substantially the same.

  Next, a ferrule insertion / extraction test was performed using the split sleeve X1 of the example of the present invention and the split sleeve of the comparative example produced in the above steps. In this ferrule insertion / extraction test, a ferrule was inserted into the split sleeve from both ends, and then one ferrule was pulled out, and the force (extraction force) required for pulling out was measured with a push-pull gauge. In addition, this test was performed using 10 split sleeves in each of the examples and comparative examples of the present invention, and the ferrules were inserted and removed 1000 times in each split sleeve. Then, in this insertion / extraction test, in order to evaluate the range of variation in the extraction force, the average value of the 10 split sleeves was calculated from the value of the extraction force obtained in the above insertion / extraction test. In addition, the measuring method of the extraction force of the split sleeve in this test is based on IEC61300-3-33. Further, the outer diameter of the ferrule used in this test is φ2.499 ± 0.0005 mm. In addition, the initial values of the removal force of the split sleeves of the examples of the present invention and the comparative examples were 2.5 to 3.5 N, respectively.

  In the split sleeve of the comparative example, since the thickness of the cylindrical body is substantially the same, the fluctuation of the extraction force is increased by the abrasion powder interposed between the ferrule and the split sleeve, and the variation of the extraction force is 0.78N. there were. On the other hand, in the split sleeve X1 which is an embodiment of the present invention, the rigidity of the slit facing portion 3a is reduced by making the thickness of the slit facing portion 3a of the cylindrical body 3 smaller than the thickness of the other cylindrical body. The variation in the extraction force could be 0.59 or less, 0.49 N, and the extraction force could be stabilized.

It is sectional drawing which shows the split sleeve of this invention. (A)-(d) is sectional drawing which shows other embodiment of this invention, respectively. (E), (f) is a perspective view which shows other embodiment of this invention, respectively. It is sectional drawing which shows the receptacle using the split sleeve of this invention. It is sectional drawing which shows the structure of a common optical connector. It is sectional drawing which shows the conventional split sleeve.

Explanation of symbols

X1-X6, X6 ', 23 ... Split sleeve Y ... Receptacle 1, 24 ... Slit 2 ... Through-hole 3 ... Cylindrical body 3a, 23a ... Slit facing part 3b ... Recess 3c ... bottom 3d, 3d '... hole 4 ... resin 10 ... fiber stub 10a ... ferrule 10b ... optical fiber 11 ... shell 12 ... holder 21 ..Ferrule 22: optical fiber

Claims (9)

A split sleeve made of a cylinder having a slit in the axial direction and having a ferrule inserted into the through-hole,
The split sleeve according to claim 1, wherein a thickness of a slit facing portion facing the slit across the through hole is thinner than that of the other portion. 2. The split sleeve according to claim 1, wherein a thickness of the cylindrical body gradually increases from the slit facing portion toward the slit. At least one of the inner peripheral surface and the outer peripheral surface of the cylindrical body of the slit facing portion is provided with a recess for making the thickness of the slit facing portion thinner than the thickness of the other part of the cylindrical body. The split sleeve according to claim 1. The split sleeve according to claim 3, wherein the concave portion is filled with a resin having a smaller elastic modulus than the cylindrical body. The bottom surface part formed so that the thickness of the said slit opposing part was made thinner than the thickness of the other part of the said cylindrical body was provided in the outer peripheral surface of the said cylindrical body of the said slit opposing part. The split sleeve in any one of -4. The split sleeve according to claim 5, wherein a hole penetrating from the inner peripheral surface of the cylindrical body to the outer peripheral surface is provided in the slit facing portion. The split sleeve according to claim 6, wherein a width of the hole portion in a direction orthogonal to a longitudinal direction of the cylindrical body is larger than a width in the longitudinal direction. The split sleeve according to claim 6 or 7, wherein the hole portions are provided at equal intervals along a longitudinal direction of the cylindrical body. The split sleeve according to any one of claims 1 to 8,
A fiber stub having an optical fiber that is held in a through hole on one end side of the split sleeve and optically coupled with a plug ferrule inserted from the other end side of the split sleeve;
And a holder that holds the other end of the fiber stub.

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