JP4928220B2 - Optical fiber pseudo-code terminal processing structure, pseudo-code holding body, and simple optical fiber connection terminal processing structure - Google Patents

Description

  The present invention relates to an optical fiber pseudo-cord terminal processing structure through which an optical fiber core wire can be inserted, a holding body that holds the optical fiber pseudo-cord having the terminal processing structure in an optical termination box, and the light The present invention relates to a simple terminal processing structure for connecting an optical fiber formed by inserting an optical fiber core into a fiber pseudo cord, and an optical termination box formed using the simple terminal processing structure for connecting an optical fiber.

  An optical fiber cable used for optical communication (hereinafter also referred to as “optical fiber” or “optical cable”) is guided from an outdoor location to an optical termination box provided inside a building, etc. In the optical termination box, an optical fiber connector (jack) for indoor wiring is connected, or is connected to an optical fiber cord having an optical fiber connector (plug) connected to the tip. However, in order to connect and convert an optical fiber drawn with a multi-core optical fiber cable into a single-fiber cable, connection processing has to be performed for each core, and a very complicated process has been required. For example, when a multi-core optical fiber cable is led from the outside into the optical termination box, and an optical fiber cord for indoor wiring (an optical cable having an optical fiber plug connected to the tip) is connected to this, It was necessary to divide the introduced multi-core optical fiber cable for each core wire, and to connect and process an optical fiber cord core wire for indoor wiring for each of the divided core wires.

  Also, the optical fiber cable led into the optical termination box is provided with an extra length portion so that the cables can be easily connected. This extra length portion is intended to reduce the size of the optical termination box. In the state of the core wire from which the coating resin has been removed, it is wound and stored in the optical termination box.

  Such a method of connecting the core wires is disclosed in, for example, Patent Document 1 (Japanese Patent Laid-Open No. 62-212607). This patent document relates to a method for reinforcing an optical fiber core wire connection portion in which a connection portion of an optical fiber core wire is surrounded by a cylindrical member made of a reinforcing material, and a heat-shrinkable silicon rubber tube is provided on the outer peripheral portion thereof. As a premise for carrying out this reinforcing method, it is described that two plastic-coated optical fiber cores are fusion-connected.

  Japanese Patent Laid-Open No. 63-149622 discloses a method for forming an optical fiber cable terminal, and it is proposed to use a rigid sleeve when forming the terminal. However, this relates to a terminal structure for drawing an optical fiber into the electro-optic component housing. In other words, when guiding an optical cable for indoor wiring into the optical termination box, the cable is connected to the optical termination box side of the cable. A terminal is formed.

Furthermore, Patent Document 3 (Japanese Patent Laid-Open No. 2006-220978) exists as a prior document relating to the optical termination box. This patent document relates to an optical outlet for mounting a distribution board that is compactly configured so that it can be installed in a distribution board. In this, a four-core fiber core is branched into four. In each case, it is described that they are connected to an optical fiber jack.
JP-A-62-212607 Japanese Unexamined Patent Publication No. 63-149622 JP 2006-220978 A

  It is very difficult to fuse and connect optical fibers in the field. As the number of connection points increases, the cost of fusion increases, and the optical signal is attenuated. For this reason, when wiring an optical cable, it is desirable to reduce the number of connections between optical fibers as much as possible.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a structure and a method capable of reducing the number of connection points and / or the number of connections between optical fibers as much as possible. In general, a four-core optical fiber cable that needs to be pulled into a dwelling unit comes out of the four-core optical fiber cable when the secondary coating is peeled off. Fusion splicing can be performed and the number of splicing steps can be reduced, but a pseudo-cord is used to divide the four-core optical fiber cord at the other end of the connection and process it into four single-core optical fiber cords. It was necessary to make an optical fiber pseudo code.
However, since the pseudo cord has a structure in which an optical fiber core is inserted into the tube, Kevlar reinforced and the outer cover is applied, the tube is deformed even if the outer side of the optical fiber pseudo cord is fastened and fixed. There is a possibility of adversely affecting the wire, and the optical fiber pseudo-cord cannot be securely fixed by means of tightening the outside of the outer cover for fixing the conventional optical fiber cord.

  Also, when pulling out the optical cable for indoor wiring from the optical termination box, the optical fiber inside the core is not cut, or the bent portion that is not desirable for transmitting optical signals is not generated. In order to prevent the cord from coming out of the optical termination box, it is necessary to hold it in the optical termination box.

  Therefore, in the present invention, a pseudo cord for protecting the optical fiber core wire is used, and an outer terminal processing structure is provided as means for fixing the pseudo cord, and the outer terminal processing unit is held in the optical termination box. It is an object to provide a holding body for the purpose.

  In order to solve at least one of the above-described problems, the present invention provides a terminal processing structure that allows a pseudo cord for optical fiber (hereinafter also simply referred to as “pseudo code”) to be held and fixed to an optical termination box. To do.

  That is, it is a pseudo-code terminal processing structure in which an outer sheath of a tube through which an optical fiber core wire is inserted is covered with a sheath whose inner side is reinforced with a reinforcing fiber layer, and one end portion side of the pseudo-cord has rigidity. The tubular body is sheathed, the reinforcing fiber layer on the end side of the pseudo cord protruding from the tubular body is exposed, and the reinforcing fiber layer is folded back along the outer surface of the tubular body, Is a terminal processing structure of a pseudo cord for optical fiber, which is integrally fixed with a heat shrinkable tube.

  In the above optical fiber pseudo cord, a layer (reinforcing fiber layer) made of a synthetic fiber of a relatively flexible tensile strength material such as Kevlar (registered trademark) is formed in the jacket of the cord, In addition, a tube having an outer diameter of about 0.9 mm through which an optical fiber core wire can be passed is provided. By passing the optical cable core through the pseudo cord tube, it can be wired and used in substantially the same manner as the optical fiber cable.

  The cylindrical body mounted on the one end portion side of the pseudo cord is formed in a cylindrical shape having a predetermined length, and has a certain degree of rigidity. This is to prevent the deformation of the tube in the pseudo cord even when a certain pressure is applied when the pseudo cord is held in the optical termination box. Such a cylindrical body can be formed of metal, ceramics, synthetic resin, or the like. In particular, in the case of forming with a synthetic resin, heat treatment is performed on the outside of the cylindrical body because a heat-shrinkable tube is provided on the outside, and the heat resistance is such that it does not deform during the heat treatment. It is desirable. Such a cylindrical body is arranged such that a portion where the pseudo cord is passed through the internal space and the outer cover of the pseudo cord is peeled to expose the reinforcing fiber layer protrudes from the cylindrical body. The reinforcing fiber layer protruding from the cylindrical portion is folded back along the outer peripheral surface of the cylindrical portion.

  The outer side of the reinforcing fiber layer folded back along the outer peripheral surface of the tubular portion is covered with a heat shrinkable tube, and the heat shrinkable tube is heated to shrink so that the pseudo cord and the tubular body are integrated. Make it. As such a heat-shrinkable tube, a commercially available tube made of polyolefin, elastic neoprene, fluoroplastic or the like can be used, and preferably a tube that heat-shrinks at a temperature lower than the heat resistance temperature of the pseudo cord.

  If the above-mentioned terminal processing structure is applied to the optical fiber pseudo-cord, the optical fiber core wire is inserted into the pseudo-cord tube and then held and fixed by holding it in the optical termination box. Even if it exists, it can hold | maintain and fix reliably, without producing damage to the said optical fiber core wire.

  Moreover, in the terminal processing structure in this invention, as the said heat shrinkable tube, what was comprised so that the length after shrinkage may become longer than the said cylindrical body, and the part which covers a cylindrical body, a tube, or a cord It is desirable to provide a stepped portion between the portion covering the surface.

  By using a heat-shrinkable tube whose axial length after shrinkage is longer than that of the cylindrical body, the heat-shrinkable tube protrudes from the pseudo-cord jacket and the cylindrical body, Can cover the tube through the wire. Further, by providing the stepped portion, the structure that supports and fixes the stepped portion can be held without depending on the frictional force. Such a stepped portion can be formed not only by the thickness of the cylindrical body, but also by covering the thickness of the heat-shrinkable tube or other members.

  Further, the heat-shrinkable tube adjusted so that the length after shrinkage is longer than that of the cylindrical body is such that the length of the heat-shrinkable tube extending toward the pseudo cord side than the cylindrical body is longer than that of the cylindrical body. It is desirable that the length is longer than the length of the heat-shrinkable tube extending to the side (cord through which the core wire is inserted). When the portion where the terminal processing structure is formed is accommodated in the holding body installed in the optical termination box, the pseudo code is obtained by causing a heat-shrinkable tube to exist between the holding body and the pseudo code jacket. This is to protect the outer jacket of the.

  If an adhesive is filled between the jacket of the pseudo cord and the heat shrinkable tube, the heat shrinkable tube and the pseudo cord can be more reliably integrated by the adhesive force of the adhesive. In particular, when the holder installed in the optical termination box holds the heat-shrinkable tube, it is possible to minimize the possibility that only the pseudo cord will come out. In addition to filling the adhesive between the jacket of the pseudo cord and the heat shrinkable tube, a commercially available heat shrinkable tube with an adhesive having an adhesive previously attached to the inner surface may be used.

  The present invention also provides an optical fiber pseudo-cord holder for solving at least one of the above problems. That is, a holding body for holding an optical fiber pseudo cord having a terminal processing structure according to the present invention in an optical termination box, the holding body being formed by a case and a cover, This is an optical fiber pseudo-cord holding body formed in a module whose body shape is substantially the same as the optical fiber connector provided in the optical termination box.

  Since the holder constitutes the holder with the case and the cover, after the portion where the terminal processing structure is formed in the pseudo cord for optical fiber is accommodated in the case, the accommodated space is Can be closed with a cover. Further, by forming this holding body shape to be substantially the same shape as the optical fiber connector, it is optional whether the optical fiber connector is installed in the optical termination box or the holding body holding the optical fiber pseudo cord is installed. It becomes possible to select. For example, in an optical termination box having four mounting portions for optical fiber connectors, optical fiber connectors are installed in two of the mounting portions, and an optical fiber plug is attached to the tip of the remaining two mounting portions. The number of connectors and holders installed can be arbitrarily adjusted, such as by installing a holder that holds the provided optical fiber pseudo cord.

  In particular, in order to securely hold the pseudo cord in the optical termination box (directly in the holding body), the tension in the holding body that supports the step portion of the terminal processing structure when tension is applied to the pseudo cord. It is desirable to provide a receiving part. Such a tension receiving part is a part that supports the step part formed in the terminal processing structure, for example, a part that is smaller in diameter than the outer shape of the step part is formed to prevent the step part from slipping through. can do.

  Further, as a structure for securely holding the pseudo code in the optical termination box (directly in the holding body), the heat shrinkable tube (particularly, the cylindrical body is covered) of the terminal processing structure portion accommodated in the holding body. (Part) It is desirable to form a jacket gripping part for gripping the outside in the holding body. Such a jacket gripping part can be formed as one or more projecting parts projecting in a wedge shape. For example, the projecting part can be formed between the tension receiving parts.

  By attaching the above holder to the optical fiber connector mounting part in the optical termination box, the conventional optical fiber connector mounting part can be used to ensure the pseudo cord with the optical fiber plug installed at the tip. It becomes possible to hold.

  In order to solve at least one of the above-mentioned problems, the present invention provides a simple terminal processing structure for connecting an optical fiber that can be easily wired indoors.

  That is, a plurality of optical fibers formed by coating a plurality of optical fiber cores cut into unit lengths and a jacket whose inner side is reinforced with a reinforcing fiber layer on the outside of a tube through which the optical fiber cores are inserted. A plurality of optical fiber core wires, one end of each of the plurality of optical fiber core wires is divided into the number of cores, and each is inserted into the tube of the pseudo cord, and the base end side of the optical fiber pseudo cord is The terminal processing structure according to the present invention is formed, the terminal processing structure is accommodated and fixed in the holding body, and an optical fiber plug is further attached to the distal end side of the optical fiber pseudo cord through which the optical fiber core wire is inserted. It is the simple terminal processing structure for optical fiber connection connected.

  In such a simple terminal processing structure for connecting optical fibers, the tip side of a plurality of optical fiber cores is divided into the number of cores, and each of the divided cores is used for an optical fiber in which the terminal processing structure is formed. An optical fiber plug is formed through the pseudo cord tube and at the tip of each pseudo cord. When such a simple terminal processing structure for optical fiber connection is used, the processing of the terminal processing structure and the connection processing of the optical fiber plug are processed in the manufacturing factory, and the building where the optical termination box is installed The work at the construction site can be reduced. As the work at the construction site, the base part of the structure is a multi-fiber optical fiber, so that the multi-fiber optical fiber drawn from the outside is used. It is possible to connect a plurality of core wires branched by being provided with an optical fiber plug at the tip to a cable drawn from outside only by fusing at one place. As a result, the number of connections between the cores can be greatly reduced, and the construction process and construction costs at the site can be reduced.

  Further, in connection with the simplified optical fiber connection terminal processing structure, an optical fiber jack is installed in one or more of a plurality of branched core wires, and the other core wires are placed in the optical fiber pseudo cord. It can also be guided.

  That is, one or two or more optical fiber cores cut into unit lengths and one or two or more outer sheaths coated with a reinforcing fiber layer on the outside of a tube through which the optical fiber core wires are inserted A plurality of optical fiber core cords, one end of each of the plurality of optical fiber core wires is divided into the number of cores, an optical fiber jack is connected to the tip of at least one optical fiber core wire, and the remaining light Each of the fiber cores is inserted into the tube of the pseudo cord, the terminal processing structure according to the present invention is formed on the proximal end side of the pseudo cord for optical fiber, and the terminal processing structure is placed in the holding body. A simple terminal processing structure for connecting an optical fiber, in which an optical fiber plug is connected to the distal end side of the optical fiber pseudo cord into which the optical fiber core wire is inserted and fixed.

  According to the simple terminal processing structure for optical fiber connection of such an aspect, the optical termination box can be provided with an arbitrary number of optical fiber jacks and pseudo cords having an optical fiber plug formed at the tip.

  And when installing the optical termination box using the optical fiber connection simplified terminal processing structure according to the present invention, a plurality of optical fibers drawn from the outside and the optical fiber connection simple terminal processing What is necessary is just to fuse | fuse with the optical fiber core wire of the several core of a structure collectively, and to synthesize | combine a fusion | melting part in an optical termination box. That is, according to such an optical termination box construction method, a plurality of optical fibers drawn from the outside and a plurality of optical fibers of a simple terminal processing structure for connecting optical fibers are fused together. As a result, the number of connection between the cores can be greatly reduced, and the construction process and construction cost can be reduced on site.

  Hereinafter, based on one embodiment shown in the drawings, the terminal processing structure 21 of the pseudo code 20 according to the present invention, the simple terminal processing structure 66 for connecting an optical fiber using the same, and the optical termination box 1 are concretely described. Explained.

  First, based on FIGS. 1-3, the whole structure of the optical termination box 1 concerning this Embodiment is shown concretely. FIG. 1 is an exploded perspective view showing an optical termination box 1 according to this embodiment, FIG. 2 is a front view of the optical termination box 1 in an exploded state, and FIG. I) Front view, (II) Bottom view, (III) Right side view, (IV) Rear view, (V) AA sectional view, (VI) BB sectional view, (VII) CC sectional view It is.

  The optical termination box 1 shown in this embodiment is formed to be approximately the same size as a standardized wiring device plate, and is configured to be installed in a wall surface of a building or a distribution board. . The optical termination box 1 connects an optical fiber cable core on the input side to an optical fiber cord on the output side obtained by dividing a plurality of optical fiber core wires and an optical fiber jack 40 on the output side, and It is comprised so that the extra length part of can be accommodated.

  The housing 10 of the optical termination box 1 includes a box main body 11, a guide tray 12 of an optical fiber core wire 50 accommodated in the box main body 11, an inner cover 13 covering from above, and an inner cover 13 on the inner cover 13. And a decorative cover 14 to be attached to each other, and each of them is detachably integrated by a screw 18, a fitting structure 19 or the like. Further, a cable guide portion 15 for guiding and holding the optical fiber cable from the outside into the housing 10 is formed on the lower surface of the housing 10, and further, an optical fiber jack 40 described later and a terminal processing structure are formed. A mounting portion 16 to which a holding body 30 that holds the pseudo cord 20 having 21 is mounted is provided.

  The mounting portion 16 is provided with a U-shaped locking portion (not shown) having a hook formed at the tip, and the holder 30 of the pseudo cord 20 and the optical fiber jack 40 are locked from both sides. It can be fixed to the housing 10 of the termination box 1. Further, the mounting portion 16 and the inner cover 13 are respectively provided with engaging grooves 41 that engage the convex portions 17 formed on the upper and lower surfaces of the holding body 30 of the pseudo cord 20 and the optical fiber jack 40, and hold them. The movement of the body 30 and the optical fiber jack 40 in the advancing / retreating direction is prevented. That is, the holding body 30 and the optical fiber jack 40 installed in the mounting portion 16 are fitted with the convex portion 17 and the engagement groove 41 by the inner cover 13 being attached, and are prevented from coming out and being reliably removed. It is fixed to the optical termination box 1.

  As shown in FIGS. 1 and 2, a plurality of optical fiber cores (cores of optical fiber cords) are wound around the housing 10 of the optical termination box 1. The plurality of optical fiber cores are divided into one core 50 at the front end side, and three of them are passed through the pseudo cord 20 provided with the terminal processing structure 21. Has been pulled out of. And the optical cable plug 60 is provided in the front-end | tip, and it is utilized as an optical fiber cord connected to an electronic device or another optical termination box.

  On the other hand, a terminal processing structure 21 is provided on the base end side of the pseudo code 20, and the region where the terminal processing structure 21 is provided is accommodated in the holding body 30 in the optical termination box. 1 in the mounting portion 16. The remaining one optical fiber core 50 divided for each core is provided with an optical fiber jack 40, and the optical fiber jack 40 is also accommodated in the mounting portion 16 in the optical termination box 1. ing.

  In the optical termination box 1 configured as described above, in the assembled state, as shown in FIGS. 3 (I) and (II), a decorative cover 14 appears on the front surface, and one light is formed on the lower surface thereof. A fiber jack 40 and three output optical fiber cords (pseudo cords 20 through which the core wire 50 is inserted) having an optical fiber plug 60 provided at the tip appear. Further, as shown in FIG. 3 (III), an annular magnet 61 is fixed by a screw on the back surface of the box body 11, and a screw hole 62 for fixing the optical termination box 1 is further formed. Yes. As shown in FIGS. 3 (V) to (VII), the optical fiber core accommodated in the box main body 11 is wound around the guide tray 12 as shown in FIGS. An optical fiber jack 40 appears below the AA cross section of FIG. 3 (V), and a holding body 30 that holds the output optical fiber cord appears below the BB cross section of FIG. 3 (VI). ing.

  The optical termination box 1 according to the present embodiment has the above-described configuration, and divides the tip side of the optical fiber core wire composed of a plurality of cores into the number of cores, and at least one of them The core wire 50 can be used as an optical fiber cord on the output side. Here, when the optical fiber cord is pulled out from the optical termination box 1, it is necessary to protect the outer side in order to prevent bending or disconnection of the core wire 50. However, conventionally, even if a plurality of optical fiber cores are pulled out separately, there is no effective means for covering the outer side of the optical fiber, and the outer jacket 53 for covering the core 50 is reliably provided to the optical termination box 1. There was no way to fix.

  Therefore, in the present invention, as the outer sheath 53 of the divided core wire 50 is formed, the tube 51 through which the core wire 50 can be inserted, the reinforcing fiber layer 52 covering the outer periphery of the tube 51, and the reinforcing fiber layer An optical fiber pseudo cord 20 composed of an outer sheath 53 covering the outside of 52 is used, and a structure and components for holding and fixing the pseudo cord 20 to the optical termination box 1 are provided.

  Hereinafter, specific examples of a structure (terminal processing structure 21) and a part (holding body 30) for holding and fixing the pseudo code 20 to the optical termination box 1 will be described with reference to FIGS.

  FIG. 4 is a (I) front view, (II) AA sectional view, and (III) BB sectional view showing the terminal processing structure 21 of the optical fiber pseudo-cord 20 in this embodiment. FIG. 6 is an exploded perspective view of the case 31 and the cover 32 constituting the holding body 30 that accommodates the terminal processing structure 21 as viewed from four directions, and FIG. 6 shows the holding body 30 that accommodates the terminal processing structure 21. (I) Front view, (II) Side view, (III) Front view with the cover 32 removed, (IV) AA sectional view, (V) Bottom view, FIG. FIG. 8 is a perspective view showing a state in which the terminal processing structure 21 formed at the end of the cord 20 is accommodated in the holding body 30, and FIG. 8 is a schematic diagram showing one embodiment of the simplified terminal processing structure 66 for connecting optical fibers. FIG. 9 shows a terminal processing structure on a holding body 30 in another form. Containing a 21 (I) a front view, (II) A-A sectional view and a (III) a bottom view.

  In the present embodiment, as described above, using the optical fiber pseudo-cord 20 in which the outer side of the tube 51 into which the core wire 50 is inserted is covered with the outer jacket 53 provided with the reinforcing fiber layer 52 on the inner side, The core wire 50 drawn out of the optical termination box 1 is protected, and an optical fiber plug 60 is provided at the tip thereof to form an output optical fiber cord. Then, a terminal processing structure 21 is formed on the base end side of the pseudo code 20 as a structure for fixing the pseudo code 20 to the optical termination box 1.

  As shown in FIG. 4, such a terminal processing structure 21 covers a pseudo body 20 having a certain thickness outside a jacket 53 of the pseudo cord 20 and projects more proximally than the cylindrical body 54. After peeling the jacket 53 of the cord 20 to expose the reinforcing fiber layer 52, the cord is folded back to the outside of the cylindrical body 54 and further covered with a heat shrinkable tube 55 to shrink it, and the pseudo cord 20 And the cylindrical body 54 are integrated. The cylindrical body 54 that is externally mounted on the pseudo cord 20 is formed to have a certain shape-retaining strength such as metal, and the length thereof is within an accommodation space 33 that is secured in the holding body 30 described later. It is formed to a length that fits. More specifically, a stepped portion 56 (stepped portion 56 formed by the thickness of the cylindrical body 54) that appears on the outer peripheral surface of the heat shrinkable tube 55 is within the accommodation space 33 secured in the holding body 30. Furthermore, it is formed to a length supported by the tension receiving portion 34 formed in the space.

  In particular, the inner side of the heat shrinkable tube 55 in this aspect is filled with an adhesive 57 in a portion covering the outer jacket 53 of the pseudo cord 20, thereby improving the integrity of the heat shrinkable tube 55 and the pseudo cord 20. It has been. Further, the heat shrinkable tube 55 has a region (L2) extending from the cylindrical body 54 to the distal end side (pseudo cord 20 side), and the proximal end side (the core wire 50 is passed through the core wire 50). It is formed longer than the area | region (L1) extended | stretched to the side. As a result, the bonding between the heat-shrinkable tube 55 and the jacket 53 of the pseudo cord 20 by the adhesive 57 becomes stronger. In addition, this adhesive 57 covers the outer sheath 53 of the pseudo cord 20 with the adhesive 57 and then coats the heat-shrinkable tube 55. A tube may be used.

  Further, the holding body 30 that accommodates the portion where the terminal processing structure 21 is formed includes a case 31 and a cover 32 as shown in FIGS. 5 and 6, and is formed on the side surface of the case 31. A claw portion 38 protruding outward is fitted into an opening 39 formed on the side surface of the cover 32 from the inside so that both are integrated. The end face of the case 31 and the cover 32 is opposed to a recess 35 that forms a hole through which the pseudo cord 20 passes and a recess 36 that forms a hole through which the tube 51 in the pseudo cord 20 passes. An accommodation space 33 for accommodating the terminal processing structure 21 is secured in the interior thereof. A tension receiving portion 34 that supports the stepped portion 56 of the terminal processing structure 21 is formed in the housing space 33, and the tension receiving portion 34 is engaged with the outer surface of the heat shrinkable tube 55 of the terminal processing structure 21. An outer cover gripping portion 37 is formed that includes a plurality of protrusions formed in a saw blade shape. In this embodiment, the tension receiving portion 34 is formed so as to protrude into the accommodation space 33, and the protruding width thereof is adjusted so as to prevent the stepped portion 56 from passing through. It is preventing you from getting out of it.

  The terminal processing structure 21 housed in the holding body 30 formed in this way is supported by the side surface of the terminal processing structure 21 supported by the jacket gripping portion 37 and the stepped portion 56 of the tension receiving portion 34. It is securely held in the body 30.

  Further, in the state in which the case 31 and the cover 32 are combined, the holding body 30 has a convex portion 17 that engages with an engagement groove 41 formed on the back side of the inner cover 13 on the front surface of the holding body 30. And a convex portion 17 that engages with an engaging groove 41 formed in the guide tray 12 of the optical fiber core wire. Each convex portion and the engaging groove 41 are formed at a position for holding the holding body 30 so that the bottom surface of the holding body 30 is substantially flush with the bottom surface of the optical termination box 1. The holding body 30 is reliably held by the optical termination box 1 by the engagement with the mating groove 41.

  As shown in FIG. 7, the holding body 30 formed as described above is attached so as to cover the terminal processing structure 21 of the pseudo code 20 described above. Specifically, the terminal processing structure is accommodated in the case 31 and then covered with the cover 32, and the claws 38 and the openings 39 on the side surfaces are engaged with each other to integrate them. Thereby, the core wire 50 passes through the inside of the pseudo cord 20 having the terminal processing structure 21, the optical fiber plug 60 is connected to the distal end side thereof, and the holding body 30 is provided in the terminal processing structure 21 on the proximal end side. The optical fiber cord wiring unit 65 is formed.

  The optical fiber core wire 50 passing through the pseudo cord 20 in the optical fiber cord wiring unit 65 is obtained by dividing a plurality of optical fiber core wires into one core wire 50. When viewed as the entire optical fiber core, as shown in FIG. 8, a simple optical fiber connecting structure in which a plurality of the optical fiber cord wiring units 65 are provided on the distal end side of the optical fiber cores of the plurality of optical fibers. A terminal processing structure 66 is formed. In addition, in this simple terminal processing structure 66 for optical fiber connection, it is also possible to separate only the holding body 30 and combine it at the construction site. That is, a plurality of optical fiber cores cut to a unit length and a tube 53 through which the optical fiber core 50 is inserted are covered with a jacket 53 whose inner side is reinforced with a reinforcing fiber layer 52. A plurality of optical fiber pseudo-cords 20, one end of each of the plurality of optical fiber core wires is divided into the number of cores, and each is inserted into the tube 51 of the pseudo-cord 20, and A terminal processing structure 21 according to the present invention is formed on the proximal end side of the cord 20, and an optical fiber plug 60 is connected to the distal end side of the optical fiber pseudo cord 20 through which the optical fiber core wire 50 is inserted. An optical fiber jack 40 is installed in one or more of the simple terminal processing structure 66 for fiber connection or a plurality of branched core wires 50, and the other core wires 50 are led into the optical fiber pseudo cord 20. It is also possible to provide an optical fiber connection simple terminal processing structure 66.

  When such a simple terminal processing structure 66 for connecting optical fibers is installed in the optical termination box 1, a base portion which is a core of a plurality of cores is wound around the guide tray 12, and each optical fiber cord The holding body 30 of the wiring unit 65 for use can be installed by arranging and fixing to the mounting portion 16 of the optical termination box 1.

  And when connecting this simple terminal processing structure 66 for optical fiber connection to the optical fiber cable core wire drawn from the outside, a plurality of optical fiber core wires are connected to each other by an optical fiber fusion device. If it is fused together, it will be completed.

  In addition, this simple terminal processing structure 66 for connecting optical fibers divides four optical fiber cores into four, and forms an optical fiber cord wiring unit 65 for the three cores 50 among them. The remaining one core wire 50 is provided with an optical cable jack, but the optical fiber cord wiring unit 65 is formed for all the other core wires 50, or the two core wires 50 are formed. The number can be arbitrarily adjusted, such as forming the optical fiber cord wiring unit 65.

  FIG. 9 shows another embodiment of the holding body 30, and the holding body 30 shown in this figure can also be used as a cover 32 for the terminal processing structure 21. In the holding body 30 shown in FIG. 9, the case 31 and the cover 32 are not fitted on the side surfaces, but the cover 32 covers the terminal processing structure 21 accommodated in the case 31 and covers it, and is formed on the lower surface. It is fixed by meshing with the outer sleeve 53 of the heat-shrinkable tube 55 or the pseudo cord 20 with a hollow. In FIG. 9, the same reference numerals are given to portions or structures having the same functions and effects as those of the holding body shown in FIG.

The exploded perspective view which shows the optical termination box 1 concerning this Embodiment The front view in the state which decomposed | disassembled the said optical termination box 1 (I) front view, (II) bottom view, (III) right side view, (IV) rear view, (V) AA sectional view, (VI) BB sectional view of the optical termination box 1, (VII) CC sectional view (I) Front view, (II) AA sectional view, (III) BB sectional view showing the terminal processing structure of the optical fiber pseudo cord in this embodiment The exploded perspective view which looked at each of the case and cover which comprise the holding body which accommodates the said terminal processing structure from four directions (I) Front view, (II) Side view, (III) Front view with cover removed, (IV) AA cross-sectional view, (V) Bottom view The perspective view which shows the state which accommodated the terminal processing structure formed in the edge part of the pseudo | spread cord for optical fibers in the holding body Schematic showing one embodiment of a simplified terminal processing structure for optical fiber connection (I) Front view, (II) AA sectional view, (III) Bottom view in which terminal processing structure is accommodated in another form of holding body

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical termination box 10 Housing | casing 11 Box main body 12 Guide tray 13 Inner cover 14 Cosmetic cover 16 Mounting part 17 Convex part 20 Optical fiber pseudo-code 21 Terminal processing structure 30 Holder 31 Case 32 Cover 33 Accommodating space 34 Tension receiving part 37 Covering portion 38 Claw portion 40 Optical fiber jack 50 Optical fiber core wire 51 Tube 52 Reinforcing fiber layer 53 Cover 54 Cylindrical body 55 Heat shrinkable tube 56 Stepped portion 57 Adhesive 60 Optical cable plug 65 Wiring unit for optical fiber cord 66 Simple terminal processing structure for optical fiber connection

Claims (13)

A pseudo-cord terminal processing structure formed by coating an outer tube reinforced with a reinforcing fiber layer on the outer side of a tube through which an optical fiber core wire is inserted,
The tubular body having rigidity is sheathed on the end portion side of the pseudo cord, the reinforcing fiber layer on the end portion side of the pseudo cord protruding from the tubular body is exposed, and the reinforcing fiber layer is further attached to the tubular body. An end processing structure of a pseudo cord for optical fiber, which is folded along the outer surface of the optical fiber and the outside thereof is integrally fixed with a heat shrinkable tube. The heat-shrinkable tube is configured such that the length after shrinkage is longer than that of the cylindrical body, and a stepped portion is provided between the portion covering the cylindrical body and the portion covering the tube or the cord. The optical fiber pseudo-code terminal processing structure according to claim 1. The heat-shrinkable tube is configured such that the length after shrinkage is longer than that of the cylindrical body, and the length of the heat-shrinkable tube extending to the pseudo cord side from the cylindrical body is longer than that of the cylindrical body. The terminal processing structure of the optical fiber pseudo-cord according to claim 1 or 2, wherein the end of the heat-shrinkable tube extends toward the tube side (cord through which the core wire is inserted).   4. The optical fiber pseudo-cord terminal processing structure according to claim 1, wherein an adhesive is filled between the pseudo-cord jacket and the heat-shrinkable tube. A holder for holding the optical fiber pseudo-cord having the terminal processing structure according to claim 1 in an optical termination box,
The holding body is formed of a case and a cover,
An optical fiber pseudo-cord holder having the shape of the holder formed in substantially the same module as an optical fiber connector provided in an optical termination box. The holding body contains a terminal processing structure portion of the optical fiber pseudo-code,
The optical fiber pseudo-cord holding body according to claim 5, wherein a tension receiving portion is provided in the holding body to support the step portion of the terminal processing structure when tension is applied to the pseudo-cord. The holding body contains a terminal processing structure portion of the optical fiber pseudo-code,
The optical fiber pseudo-cord holder according to claim 5 or 6, wherein an outer gripping portion for gripping the outside of the heat-shrinkable tube covering the cylindrical body is provided in the holder. An optical termination box having a mounting portion for an optical fiber connector,
An optical termination box, wherein the optical fiber pseudo-cord holding body according to claim 5 is attached to a mounting portion of the optical fiber connector. A plurality of optical fiber cores cut into unit lengths;
A plurality of optical fiber pseudo cords formed by covering the outer side of the tube through which the optical fiber core wire is inserted and covering a jacket whose inner side is reinforced with a reinforcing fiber layer,
One end of the plurality of optical fiber core wires is divided into the number of cores, and each is inserted into the tube of the pseudo cord,
The terminal processing structure according to claim 1 is formed on the base end side of the optical fiber pseudo-cord, and the terminal processing structure is accommodated and fixed in the holding body,
Furthermore, a simple terminal processing structure for connecting an optical fiber, characterized in that an optical fiber plug is connected to the tip side of the optical fiber pseudo-cord through which the optical fiber core wire is inserted. A plurality of optical fiber cores cut into unit lengths;
Including one or two or more optical fiber pseudo-cords formed by coating an outer sheath reinforced with a reinforcing fiber layer on the outer side of a tube through which the optical fiber core wire is inserted;
One end of the plurality of optical fiber cores is divided into the number of cores, an optical fiber jack is connected to the tip of at least one optical fiber core, and each of the remaining optical fiber cores is connected to the pseudo code. Insert it into the tube,
The terminal processing structure according to claim 1 is formed on the base end side of the optical fiber pseudo-cord, and the terminal processing structure is accommodated and fixed in the holding body,
Furthermore, a simple terminal processing structure for connecting an optical fiber, characterized in that an optical fiber plug is connected to the tip side of the optical fiber pseudo-cord through which the optical fiber core wire is inserted.   The simple terminal processing structure for optical fiber connection according to claim 9 or 10, wherein the holder according to claim 5 to 7 is used as the holder. An optical termination box in which a plurality of optical fiber connector mounting portions are formed,
12. The optical termination according to claim 9, wherein a holder or an optical fiber jack in the simplified terminal processing structure for connecting optical fibers according to claim 9 is attached to one or more of the mounting portions. box. An optical termination box construction method using the optical termination box according to claim 12,
A step of fusing together a plurality of optical fiber core wires drawn from the outside and a plurality of optical fiber core wires of a simple terminal processing structure for connecting optical fibers constituting the optical termination box. The construction method of the optical termination box.

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