JP2007065248A - Cord fixing structure of optical connector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the cord fixing structure of optical connector capable of fixing an optical cord to an optical connector with good operability while keeping a necessary strength, at a low cost. <P>SOLUTION: The optical connector comprises: an optical connector main body 08 which retains the tip end of an optical fiber and has a main body connection part 080; and a cord fixing member 01 which has a connector connection part 012 connected with the main body connection part 080 and a cord-fixing part 011 for fixing the optical cord 5. Therein, the cord fixing structure of optical connector is constituted such that protruded parts 13 are disposed on the inner surface of the cord-fixing part 011, the optical cord 5 is inserted into the cord-fixing part 011, thereafter, the cord-fixing part 011 is deformed, the protruded parts 13 are forced to cut into the cord cover of the optical cord 5 and, thereby, the optical cord 5 can be fixed and retained. Further, the cord fixing structure of optical connector is constituted such that the optical connector main body 08 and the connector connection part 012 are connected turnably. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention is an optical connector applied to connection of various optical devices for optical fiber communication, connection of optical fibers, connection of optical devices and optical fibers, and in particular, an optical cord can be easily fixed to the optical connector. The present invention relates to the structure of an optical connector.

  In general, an optical connector is attached to an end of an optical cord (also called an optical cable). The optical cord is an optical fiber core made of an optical fiber and a coating material that covers the optical fiber, and a tensile fiber (hereinafter referred to as a tensile body) provided around the optical fiber core to protect the optical fiber core. And a cord skin made of a soft resin that covers and protects the optical fiber core and the tensile body. The cord sheath and the tensile body must be firmly fixed to the optical connector so that the optical cord does not come off the optical connector when the optical cord is pulled.

  As a conventional optical connector, a JIS C 5973 F04 type optical connector or a so-called SC type optical connector is known. As described in the supplement of Non-Patent Document 1, in the SC type optical connector, the cord cover and the tension member are fixed to the optical connector by caulking.

  In order to perform caulking, first of all, an approximately cylindrical metal part called a stop ring is fitted and fixed to the rear part of a part called an optical connector body that contains a ferrule or a spring holding an optical fiber, and the outer periphery of the stop ring is fixed. A tensile body is attached to the substrate, and an approximately cylindrical metal called caulking is placed thereon to caulk the tip of the caulking ring. As a result, the strength member is fixed to the stop ring. Next, the cord skin is torn and placed on the outer periphery of the caulking ring, and a metal cylindrical ring is placed on it and the ring is caulked. As a result, the cord skin is fixed. By these operations, the optical cord is firmly fixed to the optical connector.

  As another optical connector, a JIS C 5973 F12 type optical connector or a so-called MU type optical connector is known. As described in the supplement of Non-Patent Document 1, the MU type optical connector performs caulking and fixing on the tensile body using stop rings and caulking as in the SC type optical connector. However, the cord skin is fixed with an adhesive. That is, a boot that is inserted through the cord outer shell and is coupled to the rear end portion of the stop ring is used, and an adhesive is applied to the inside of the boot to adhere and fix the cord outer shell and the boot.

JIS standard, standard number JIS C 5973: 1998, "F04 single fiber optic connector"

  However, in the optical cord fixing method used in the above-mentioned conventional optical connector, the caulking parts used for caulking fixing have a strength to withstand caulking and are manufactured with high accuracy when the tensile body and the cord outer shell are fixed by caulking. Need to be. Further, the caulking part (chuck part) of the caulking tool used for caulking must be highly accurate and durable enough to withstand many uses.

  For this reason, it is necessary to use a part used for caulking and fixing with high precision by metal cutting, and there is a drawback that the cost of the part is high. Further, the caulking tool also has a drawback in that the caulking tool is expensive because it is necessary to use a metal having high hardness and high accuracy in the chuck portion for caulking.

  In addition, when performing the above-described caulking and fixing using caulking parts, caulking tools, etc., it is necessary for an operator having a certain skill in the caulking technique to perform the work in a predetermined procedure so that the predetermined strength can be obtained. There is a drawback that it is difficult to improve work efficiency and reduce work costs. Furthermore, in order to obtain a predetermined caulking strength in the caulking, it is necessary to finish the deformation of the member after caulking with a high accuracy so as to have a predetermined size. For example, when the outer diameters of the cords are different, it is necessary to prepare components and caulking jigs that match the outer shape of the cords in order to obtain a predetermined fixing strength. Therefore, when the outer diameters of the cords are different, it is necessary to align parts and caulking jigs according to the outer diameters of the cords, and the work is complicated.

  Also, when using an MU-type optical connector that fixes the optical connector and the cord sheath with an adhesive, it is necessary to use an appropriate amount of adhesive to be applied. There was a difficulty in workability. In addition, the fixing strength may deteriorate due to oil adhering to the outer cord of the cord that adheres to the optical connector, and the fixing strength of the adhesive may decrease due to the conditions of application of the adhesive or the influence of humidity during long-term use. There was also a risk of the cord coming out of the connector.

  Further, in the conventional optical cord fixing method, since the tensile body and the cord sheath are fixed to the stop ring coupled to the optical connector main body, the optical connector main body and the cord fixing portion are integrated with each other. The mounting direction of the optical connector cord is determined by the mounting direction. For example, when an optical connector is attached to an adapter or optical device of an optical connector mounted on a wall surface, the optical cord extraction direction of the optical connector cannot be set at a free angle with respect to the wall surface or device.

  In view of the above-described problems of the conventional technology, the present invention provides an optical cord fixing structure capable of suppressing the cost of members, and can be easily fixed without requiring any special skill even in fixing work. Another object of the present invention is to provide an optical connector cord fixing structure capable of maintaining a necessary strength.

  In addition, by providing an optical connector cord fixing structure that allows the angle between the optical connector and the optical cord to be freely changed, the optical connector can be mounted in a direction perpendicular to or parallel to the mounting surface of the optical connector. It is another object of the present invention to provide a means capable of changing the direction of the optical cord.

  An optical connector cord fixing structure according to claim 1 of the present invention for solving the above-described problems is coupled to an optical connector body containing at least a component for holding an optical fiber and a rear portion of the optical connector body. A cord fixing structure of an optical connector for fixing an optical cord in which the optical fiber is arranged at an axis, and the optical connector main body is coupled to the cord fixing member. The cord fixing member has at least a connector coupling portion coupled to the main body coupling portion and a cord fixing portion for fixing the optical cord, and the connector coupling portion is coupled to the main body coupling portion. The cord fixing portion is deformable, and has an inner surface protruding at least on the inner side of the cord fixing portion and a cord outer shell for pressing the cord outer shell. And a pressure surface, characterized in that fixing and holding said optical code by said locking pawl the code skin pressing surface holds the optical code crust that bites into the code skin.

  The cord fixing structure of the optical connector according to claim 2 of the present invention for solving the above-mentioned problems is the cord fixing structure of the optical connector according to claim 1, wherein the cord fixing portion is pressed against the cord envelope before deformation. An inscribed circle formed by the surface and the locking claw is larger than the diameter of the optical cord, the tip of the optical cord can be inserted, and after deformation, the inner cross-sectional shape of the cord outer skin pressing surface is It is the same as or slightly smaller than the diameter of the optical cord, the cord outer skin pressing surface holds the optical cord outer shell, and the locking claw bites into the cord outer shell to fix and hold the optical cord.

  The cord fixing structure of the optical connector according to claim 3 of the present invention is the cord fixing structure of the optical connector according to claim 1 or 2, wherein the optical connector main body has a locking hole or locking in the main body coupling portion. The cord fixing member has a locking projection or a locking hole at the tip of the connector coupling portion, and the optical connector body and the cord fixing member have the locking hole in the locking projection. It is characterized in that it is rotatably coupled by being pivotally supported.

  According to the cord fixing structure of the optical connector constructed in accordance with the present invention, the strength member and the cord sheath can be fixed to the optical connector with one component, so that the number of parts of the connector can be reduced. In addition, since the parts for fixing do not require high accuracy, the parts can be manufactured by processing parts using a mold that can be mass-produced and reduced in cost. In addition, the tool used to fix the cord to the low-cost part does not require a relatively expensive caulking tool and can use inexpensive general-purpose pliers. Furthermore, the fixing work does not require precision and technology compared to caulking.

From these facts, there is an advantage that the cost of parts and tools can be reduced and the work performance can be improved and the cost can be reduced. In addition, even if the outer diameters of the cords are different, there is no need to prepare parts and tools for each outer diameter of the cords.
Further, it is possible to provide a cord fixing method having a structure in which the holding direction of the cord can be changed as necessary.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. For example, as shown in FIG. 1, the optical connector is composed of a cord fixing member 01 for fixing the optical cord 5, a ferrule 082 for holding an optical fiber, and other various parts, and is coupled to the cord fixing member 01. And an optical connector body 08.

  At the rear of the optical connector body 08, a coupling portion 080 is provided as a body coupling portion that couples to the cord fixing member 01. Further, the coupling portion 080 is formed with a locking projection 081 that protrudes perpendicular to the axial direction. ing. On the other hand, the cord fixing member 01 is provided with a connector coupling portion 012 coupled to the coupling portion 080 on the front side and a cord fixing portion 011 for fixing the optical cord on the rear side. The connector coupling part 012 is formed with a connector locking hole 0122 that engages with the locking projection 081 in a rotatable manner. Further, the cord fixing part 011 is constituted by two cord skin contact parts 014 facing each other toward the axial center. The cord skin contact portion 014 can be deformed with the cord fixing portion 011 side as a fulcrum, and a plurality of serrated projections 013 are formed on the inner surface of the cord skin contact portion 014 in the axial direction.

  FIG. 2 shows a state where the optical cord 5 and the optical connector are coupled. As shown in FIG. 2A, the optical cord 5 and the cord fixing member 01 are fixed by a cord fixing portion 011. That is, the end surface of the outer cover of the optical cord 5 is inserted into the open code cover contact portion 014 indicated by a two-dot chain line in the figure, and the cord cover contact portion 014 is closed with the connector fixing portion 011 side as a fulcrum.

  Since the cord skin contact portion 014 is provided with a sawtooth-shaped projection 013, when the cord skin contact portion 014 is closed, the projection 013 bites into the cord skin and is fixed to the optical cord 5. It is assumed that the optical cord 5 is inserted into the deformed portion with the cord sheath and the tensile member peeled in advance by a predetermined length, and the optical fiber (broken line) is inserted to the tip of the ferrule 082.

  Further, the optical connector main body 08 and the cord fixing member 01 are coupled by pivotally supporting the connector locking hole 0122 to the locking projection 081. For example, as shown in FIG. It is possible to make the connector main body 08 and the cord fixing member 01 substantially perpendicular.

  According to the present embodiment, the optical cord 5 can be fixed to the optical connector by biting the protrusion 013 of the cord outer skin contact portion 014 into the outer skin of the optical cord 5, so that accuracy and technology can be improved during work. Workability is improved. In addition, since a special tool or the like used for the fixing work is not required, the cost can be reduced. Further, since the cord fixing member 01 is configured to be rotatable with respect to the optical connector body 08, the cord fixing member 1 is rotated as necessary when various optical devices for optical fiber communication are connected. Then, there are advantages such as easy connection and installation, and an aesthetic appearance.

  By the way, since the tip of the optical fiber is held by the ferrule 082, when the cord fixing member 01 rotates with respect to the optical connector main body 08 as shown in FIG. The optical fiber indicated by the middle broken line is bent. Therefore, in the present embodiment, it is more preferable to use an optical fiber having high flexibility with reduced loss for bending. The same applies to the embodiments described below.

  Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings. 3 is a cross-sectional view showing the structure behind the cord fixing member 1 of the optical connector according to this embodiment, and FIG. 4 is a cross-sectional view taken along the line AA of FIG. The description of the configuration similar to that in FIGS. 1 and 2 described above will be omitted, and the description will focus on the differences.

  As shown in FIGS. 3 and 4, the end of the optical cord 5 is fixed by a cord fixing portion 11 behind the cord fixing member 1. The cord fixing portion 11 has a cord skin contact portion 14 for holding the optical cord 5, and the inner surface of the cord skin contact portion 14 is a cord skin pressing surface in contact with the locking claw 13 protruding in the axial direction and the cord skin 55. 15.

  The optical cord 5 includes an optical fiber core 51 made of an optical fiber and a coating material covering the optical fiber, a cord sheath 55 formed of a soft resin and covering the optical fiber core 1, and the optical fiber core 51 and the cord. It is constituted by a tensile body 53 interposed between the outer skin 55 and the outer skin 55. The optical fiber core wire 51 is held at the tip of the optical connector, and the strength member 53 is pulled out to the outside of the cord fixing portion 11 and wound around the strength member fixing portion 17 to be bonded.

  In the cord fixing member 1, the cord outer surface pressing surface 15 presses the outer periphery of the cord outer shell 55, and the locking claw 13 bites into the cord outer shell 55 to fix the optical cord 5. Even if the optical cord 5 is pulled in the direction (right direction in FIG. 3), the optical cord 5 does not come out of the cord fixing member 1.

  The height of the locking claw 13 is smaller than the thickness of the cord outer skin 55, and the cord outer surface pressing surface 15 that contacts the cord outer skin 55 is larger than the area of the tip of the locking claw 13 that bites into the cord outer skin 55. The area of is sufficiently large. Therefore, even if the cord outer contact portion 14 of the cord fixing member 1 is pressed with a strong force, the cord outer surface pressing surface 15 uniformly presses the outer peripheral surface of the optical cord 5, so that the locking claw 13 is attached to the cord outer shell 55. Although it bites in, the shape of the optical cord 5 is not greatly deformed except for the portion where the locking claw 13 bites.

  In the case where the optical connector and the optical cord 5 are fixed by conventional caulking, the cord outer shell 55 is fixed by caulking a metal ring that covers the cord outer shell 55, so that the cord outer shell 55 is greatly deformed together with the ring. It was. However, when this embodiment is used, there is almost no deformation of the optical cord 5 as described above. Therefore, when the optical cord 5 is fixed according to the present embodiment, the force for fixing the cord sheath 55 hardly reaches the optical fiber core wire 51.

  The optical cord 5 is fixed when the locking claw 13 bites into the cord skin 55, but the locking claw 13 has a substantially protruding shape, and the area of the tip that bites into the cord skin 55 is sufficient as described above. Since it is small, it can be made to bite into the cord outer shell 55 with a small force as compared with caulking and the like. Therefore, the optical cord can be fixed more easily than caulking.

  Even if the outer diameters of the optical cords 5 are slightly different, the fixing strength depends on the biting of the locking claws 13, so that the cord outer skin pressing surface 15 is appropriately deformed by deforming the cord outer skin contact portion 14 of the cord fixing member 1. As a result, the locking claw 13 can bite into the cord outer shell 55 to obtain a necessary fixing strength.

  In the case of fixing by caulking, dimension management before and after caulking is necessary to obtain a predetermined strength. In this embodiment, instead of this, the cord skin pressing surface 15 of the cord fixing member 1 presses the cord skin 55. Since it can be managed by force, the processing accuracy of parts, the accuracy of jigs, and skill at the time of work are not required, so that workability can be improved and cost can be reduced.

  3 and 4, the locking claw 13 has a structure constituted by two protrusions arranged symmetrically with respect to the axis. However, the locking claw 13 is not limited to the structure shown in the figure, and is a cord fixing member for fixing the optical cord 5. As a structure, it has a cord outer surface pressing surface and a locking claw, and has a space through which these can be inserted into the cord fixing member before the end of the optical cord 5 is inserted. The end of the optical cord 5 is used as the cord fixing member. After insertion, the cord skin contact portion may be deformed so that the cord skin pressing surface is pressed against the cord skin and at the same time the engaging claw is bitten into the cord skin.

  FIG. 5 shows a second embodiment of the present invention. 5A, 5B, and 5C are a top view, a front view, and a bottom view, respectively. FIGS. 5D and 5E are views taken along the line B-B in FIG. 5B, and show states before and after the cord fixing portion 21 is deformed, respectively. FIG. 5 (f) is a CC arrow view of FIG. 5 (b). In addition, description is abbreviate | omitted about the structure similar to FIGS. 1-4 mentioned above, and it demonstrates centering on a different point.

  The cord fixing member 2 described in the present embodiment is manufactured by sheet metal processing. That is, a plate-shaped metal is punched with a metal mold, and then the shape is sequentially deformed with a plurality of sheet metal molds for deformation to finally obtain the shapes shown in FIGS. Specifically, the cord fixing portion 21 of the optical connector according to the present embodiment has a pressing surface tongue piece 2152 in which one of the end portions in the circumferential direction of the cord skin contact portion 24 extending from the bottom portion is convex in the center, The other end portion has a concave portion that engages with the pressing surface tongue piece 2152 at the center, and has pressing surface tongue pieces 2153 on both sides thereof, and the both ends are substantially engaged with each other, and is perpendicular to the axial direction of the optical fiber. The cross section is substantially circular.

  Furthermore, the cord fixing portion 21 has three engaging claws 2131 projecting from the inner surface of the engaging claw 2131 projecting from the inner surface of the bottom portion 2151, the pressing surface tongue piece 2152 and the pressing surface tongue piece 2153, respectively. The claw 2132 has a total of four locking claws. In addition, as shown in FIG.5 (d), the inner cross section of the code | cord | chord outer skin contact part 24 before deform | transforming the code | cord | chord fixing | fixed part 21 is a shape which includes the inscribed circle 181 (dashed line) whose diameter is larger than a cord outer diameter. Therefore, the end of the optical cord can be freely inserted.

  In order to fix the optical connector to the optical cord, after inserting the end portion of the optical cord into the cord fixing portion 21, the bottom portion 2151 of the cord fixing portion 21, the pressing surface tongue piece 2152 and the upper portion 2155 of the pressing surface tongue piece 2153. Press with pliers. By this operation, as shown in FIG. 5 (e), the pressing surface tongue piece 2152 and the pressing surface tongue piece 2153 are deformed so that the inner cross section of the cord outer skin pressing surface 215 becomes substantially the same shape as the cross section of the cord outer skin, The tip ends of the four locking claws 2131 and the locking claws 2132 move inward from the inscribed circle 181. As a result, the locking claws 2131 and 2132 bite into the cord sheath, and the optical cord is firmly fixed to the optical connector by the cord fixing member 2.

(Experimental example)
The results according to this example are shown in Table 1.

  The optical fiber core wire is 0.5 mm, and as a tensile body, an aramid fiber covers the periphery of the optical fiber core wire, and the outer periphery thereof is covered with a cord skin using a soft synthetic resin. The outer diameter of the optical cord is 4 mm. The end portion of the optical cord was inserted into the fixing member 21 described above, and the fixing member 21 was deformed and fixed by the method described above.

  As shown in the table, the fixing strength was 7 kgf or more, and it was confirmed that the fixing strength was sufficiently strong as the cord holding strength of the optical connector. Note that a single mode optical fiber is used for the optical fiber core, but the connection loss in the optical connector having the cord fixing member of the present embodiment is 0.13 dB on average in the experiment with respect to the target connection loss of 0.5 dB. It was confirmed that the performance was sufficiently practical.

  As described above, according to the present embodiment, parts and operations for fixing the optical cord can be realized at low cost. Further, the advantages of the embodiments are not limited to this. That is, like the JIS C 5973 SC type optical connector, the normal optical cord is fixed to the optical connector at the rear of the optical connector main body containing the ferrule for holding and connecting the optical fiber, and by the caulking ring, the ring, etc. Clamp the tensile body. The optical connector main body rear portion to be fixed, the caulking ring, the ring, and the like have a structure in which they are integrated with each other after the caulking is fixed. Therefore, in the conventional optical connector, it is difficult to fix the optical cord and the optical connector main body in a movable state.

  On the other hand, in this embodiment, the optical cord is fixed only by the rear portion of the cord fixing member 2, which is a single component, that is, the cord fixing portion 21. For this reason, the front part of the cord fixing member 2 can be used as a coupling part with the optical connector main body, and a structure independent of the rear cord fixing part 21 can be achieved. In FIG. 5 described above, the front portion of the cord fixing member 2 is a connector coupling portion 22 for coupling to the rear portion of the optical connector. The connector coupling portion 22 has two locking pieces 221 that rise from the bottom 2151 of the cord fixing member 2, and each of the two locking pieces 221 has a circular connector locking hole 222.

  FIG. 6A shows a state in which the optical cord 5 is fixed by the cord fixing member 2 and the connector coupling portion 22 is coupled to the rear portion (hereinafter, the connector main body rear portion) 80 of the optical connector main body 8. Moreover, FIG.6 (b) is a BB arrow line view of Fig.6 (a). In addition, description is abbreviate | omitted about the structure similar to FIGS. 1-5 mentioned above, and it demonstrates centering on a different structure. In FIG. 6A, only the rear end of the optical connector is shown.

  FIG. 7 is an explanatory view of the cord fixing member 2 and the rear part of the optical connector body 8. This is a state before the cord fixing member 2 is coupled to the rear portion of the optical connector body 8. FIG. 7A is a front view, and FIG. 7B is a top view. As described above, the connector coupling portion 22 is provided with the connector locking hole 222, while the optical connector main body rear portion 80 is substantially the same as the connector locking hole 222 in order to engage with the connector locking hole 222. A circular locking projection 81 having a diameter is provided.

  When the optical connector main body 8 and the cord fixing member 2 are coupled, the locking piece 221 is expanded, and the locking projection 81 of the optical connector rear portion 80 is rotatably fitted into the connector locking hole 222 of the cord fixing member 2. After the fitting, the locking piece 221 is returned to the original position, whereby the cord fixing member 2 is coupled to the rear portion 80 of the connector 8.

  When the optical connector rear portion 80 and the cord fixing member 2 are coupled with each other in this structure, the connector locking hole 222 is pivotally supported by the locking projection 81, and the cord fixing member 2 rotates with respect to the optical connector rear portion 80. It becomes possible to move. Thus, with the structure of this embodiment, the optical fiber can be held at an angle between the optical connector main body 8 side held by the ferrule and the cord fixing member 2 side held by the optical cord. It becomes possible.

  In the conventional optical connector structure, the optical cord is held in a state where the optical connector main body and the cord fixing portion are fixed substantially in a straight line. For example, the optical connector is mounted on the optical connector adapter or the optical device mounted on the wall surface. In doing so, the direction in which the optical cord is held by the optical connector is determined by the mounting direction of the adapter or the device.

However, according to this embodiment, since the optical connector is configured to be rotatable, the angle of the optical cord can be freely changed with respect to the mounting surface. The direction of the optical cord can be changed after the optical connector is attached. This is also desirable in terms of aesthetics when mounting an optical connector.
Further, the locking hole for coupling with the optical connector main body is not limited to a circular shape, and can be formed in various shapes according to a required fixing method.

  FIG. 8A shows a third embodiment of the present invention regarding the connecting structure of the connector main body rear portion 80 and the cord fixing member 3. FIG. 8A shows a part of the connector main body rear part 80 and a part of the connector fixing part 32 of the cord fixing member 3. In this coupling structure, the locking projection 83 provided on the connector main body rear portion 80 is a substantially square projection. On the other hand, the locking hole 323 provided in the connector coupling portion 32 is formed by a rectangle and a circle arranged with the center shifted from the rectangle, and has a line-symmetric shape having a straight convex portion 3231 and an arc portion 3232. To do. The convex portion 3231 has substantially the same shape as the end of the locking projection 83 of the connector rear portion 80, and the arc portion 3232 has a slightly larger radius than the circumscribed circle of the locking projection 83.

  With such a structure of the locking projection 83 and the connector locking hole 323, the locking projection 83 is rotated in a state of being engaged with the arc portion 3232, and then the locking projection 83 is linearly aligned with the locking hole 323. By moving to the portion 3231, the cord fixing member 3 can be fixed to the rear portion 80 of the optical connector by bending it straight or by ± 90 degrees. Therefore, the rear portion 80 of the connector and the cord 5 can be fixed on a straight line as shown in FIG. 8B, or the cord 5 can be fixed at a right angle to the rear portion 80 of the connector as shown in FIG. 8C. It becomes possible.

  In the example of FIG. 8, the shape of the locking projection 83 is rectangular, but when it is fixed at an angle other than 90 degrees, it is not limited to a rectangle but may be a polygon. In this case, the polygonal shape of the locking projection is determined so that the necessary angle is obtained, and the locking hole may be formed by overlapping the polygon and the circumscribed circle of the polygon.

  Furthermore, in this embodiment, the connector protrusion 80 is provided on the connector rear portion 80 and the connector fixing hole 323 is provided on the cord fixing member 3. The same applies to a structure in which a locking projection is provided.

  FIG. 9 shows the structure of the cord fixing member 4 according to the fourth embodiment of the present invention. In the above-described embodiments, the cord fixing member is formed by sheet metal processing, but the present invention is not limited to the structure by sheet metal processing. The function of the cord fixing member 4 of the present embodiment is almost the same as that of the above-described embodiment, but instead of sheet metal processing, synthetic resin is molded by a molding die and used.

  A cord fixing portion 41 provided at the rear portion of the cord fixing member 4 has a shape obtained by cutting a substantially cylindrical portion in one axial direction, and includes locking portions 416 and 417 that are respectively locked to end portions extending in the axial direction. Provided. Furthermore, four locking claws 413 are provided on the inner surface of the cord fixing portion 41. The cord fixing portion 41 has a structure in which the tip of the locking claw 413 has an inscribed circle larger than the diameter of the optical cord (not shown) before the locking portions 416 and 417 are engaged with each other. The optical cord can be inserted freely.

  When the optical cord is fixed to the cord fixing member 4, when the locking portions 416 and 417 are engaged with each other after the optical cord is inserted, the inner surface of the cord fixing portion 41 becomes substantially the same shape as the diameter of the optical cord. The outer skin pressing surface 415 contacts the cord outer shell, and at the same time, the locking claw 413 bites into the cord outer shell. As a result, the optical cord is fixed to the cord fixing portion 41 as in the above-described embodiment.

  In this embodiment, the front portion of the cord fixing member 4 has the same structure as that of the second embodiment. With this structure, the optical fiber held by the optical cord and the optical connector as in the second embodiment. It becomes possible to hold | maintain the axial direction of the optical fiber hold | maintained at the main body 8 in the state which has an angle.

  According to the optical connector according to the embodiment and Examples 1 to 3 described above, the number of parts can be reduced because the tension member, the cord outer cover, and the optical connector can be fixed with one part. In addition, unlike the case where the strength member, the cord sheath, and the optical connector are fixed by caulking, parts that require high accuracy are not required.

  For this reason, it is possible to manufacture parts by sheet metal molds or molding dies that can be mass-produced at low cost. In addition, the tool used for fixing the optical cord does not require an expensive caulking tool required for conventional caulking, and the cord can be fixed to the optical connector using general-purpose pliers. . For this reason, there is an effect that cost can be reduced.

  Furthermore, since the fixing work does not require accuracy and technology compared to caulking and the like, there is an advantage that the work efficiency can be improved and the work cost can be reduced. Even if the outer diameter of the cord is different, there is no need to prepare parts and tools for each outer diameter of the optical cord, and it has an excellent effect that a wide variety of cords can be handled with common parts, tools, and work processes. .

  In addition, if the configuration is such that the holding strength necessary for fixing the cord is maintained and the axial direction of the optical cord is fixed so that the angle can be changed with respect to the axial direction of the optical fiber held by the optical connector main body, The mountability of the connector can be greatly improved.

  INDUSTRIAL APPLICABILITY The present invention is applicable to an optical connector used for connection of various optical devices for optical fiber communication, connection of optical fibers, or connection between optical devices and optical fibers.

It is a perspective view which shows an example of the best embodiment of this invention. It is a side view which shows an example of the best embodiment of this invention. It is sectional drawing which shows the structure of the cord fixing part by the 1st Example of this invention. It is AA sectional drawing of FIG. It is explanatory drawing which shows the cord fixing member by the 2nd Example of this invention. It is explanatory drawing which shows the state which couple | bonded the optical connector main body and cord fixing member by 2nd Example of this invention. It is explanatory drawing which shows the structure of the optical connector main body by the 2nd Example of this invention, and a cord fixing member. It is explanatory drawing which shows the coupling | bond part vicinity by the 3rd Example of this invention. It is a perspective view which shows the cord fixing member by the 4th Example of this invention.

Explanation of symbols

01, 1, 2, 3, 4 Cord fixing member 011, 11, 21, 31, 41 Cord fixing part 012, 12, 22, 32, 42 Connector coupling part 0122, 222, 323 Locking hole 013, 13, 2131, 2132,413 Locking claws 014,14,24 Cord outer surface pressing surface 181 Inscribed circle 5 Optical cord 51 Optical fiber core wire 08,8 Optical connector main body 080,80 Coupling portion 081,81,83 Locking protrusion

Claims (3)

  An optical cord comprising: an optical connector main body containing at least a component for holding an optical fiber; and a cord fixing member coupled to a rear portion of the optical connector main body, wherein the cord fixing member is arranged with the optical fiber as an axis. In the cord fixing structure of the optical connector for fixing the optical connector, the optical connector main body has a main body coupling portion coupled to the cord fixing member, and the cord fixing member is at least a connector coupling portion coupled to the main body coupling portion; A cord fixing portion for fixing an optical cord, the connector coupling portion being coupled to the main body coupling portion, the cord fixing portion being deformable, and an inner surface protruding at least inside the cord fixing portion A claw and a cord skin pressing surface for pressing the cord skin, wherein the cord skin pressing surface holds the optical cord skin and the locking claw Code fixing structure of the optical connector, characterized in that fixing and holding said optical code by bite into over de skin.   Before the deformation of the cord fixing portion, the inscribed circle formed by the cord outer surface pressing surface and the locking claw is larger than the diameter of the optical cord, and the distal end portion of the optical cord can be inserted. The inner cross-sectional shape of the cord outer skin pressing surface is the same as or slightly smaller than the diameter of the optical cord, the cord outer skin pressing surface holds the optical cord outer shell, and the locking claw bites into the cord outer shell. 2. The cord fixing structure for an optical connector according to claim 1, wherein the optical cord is fixedly held.   The optical connector main body has a locking hole or a locking projection at the main body coupling portion, and the cord fixing member has a locking projection or a locking hole at the tip of the connector coupling portion, The cord fixing structure for an optical connector according to claim 1 or 2, wherein the cord fixing member is rotatably coupled to the locking projection by pivotally supporting the locking hole. .

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