JP2007121772A - Coated optical fiber holder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coated optical fiber holder which can detachably be set to an optical cable holder. <P>SOLUTION: The coated optical fiber holder has a rod-shaped body of a component embedded in an optical cable storage part of the optical cable holder. The coated optical fiber holder is characterized in that the rod-shaped body is formed sufficiently thin to be fitted in a cable storage part, a base where a coated optical fiber is mounted is arranged on the rod-shaped body, and a push cover covering the surface of the base is arranged on the surface of the base. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention grips the end of an optical fiber, removes the coating layer of the optical fiber to expose the bare optical fiber, or cuts the bare optical fiber to a certain length. The present invention relates to an optical fiber core holder used for, for example.

  In recent years, the construction of optical subscriber line networks has been progressing rapidly. In general, a drop optical cable 7 as shown in FIG. 9 is used as a drawing optical cable for drawing from a trunk optical cable into a home such as each home.

  This optical cable 7 is a tension member 2 having a substantially circular cross-sectional shape on both sides of an optical fiber core wire 1 having one or more optical fiber core wires assembled together in a circular or rectangular cross section. Further, the support wire 3 is arranged, and the optical fiber core wire 1, the tension member 2, and the support wire 3 are covered with a common sheath 4.

  Here, notches 5 for facilitating the tearing of the sheath 4 are formed on both side surfaces of the sheath 4 close to the optical fiber core wire 1. The support wire 3 is for holding the optical cable main body 6 composed of the optical fiber core wire 1, the tension member 2 and the sheath 4, and the optical cable main body 6 is a constricted portion 4 ′ of the sheath 4. It is connected.

  In addition, an indoor optical cable 8 as shown in FIG. 10 is used in a home or premises of each home. This optical cable has the same configuration as that of the optical cable body 6 of the optical cable 7 shown in FIG. 9, and can also be configured by removing the support wire 3 portion.

  Generally, in these optical cables, the tension member 2 is disposed in the sheath 4 as described above. Conventionally, a steel wire has been used as the tension member 2, but recently, a non-metallic member has been used to avoid the influence of a surge current from the tension member during a lightning strike.

  Conventionally, when connecting an optical connector to the end of these optical cables, the optical fiber core wire is exposed by peeling off the coating layer at the end of the optical cable, and then exposed by the optical fiber core holder. A process of holding the end of the optical fiber core and removing the coating layer at the end of the optical fiber core or cutting the bare optical fiber from which the coating layer has been removed to a certain length has been performed. (For example, Patent Document 1 to Patent Document 5)

  That is, these optical fiber core holders hold the optical fiber core 1 exposed by removing the sheath 4 of the optical cable 8, as shown in FIG. For this reason, the coating layer of the optical fiber 1 is removed while leaving at least the length L of the optical fiber core wire that the optical fiber core holder 9 is interposed, and the bare optical fiber 1 ′ is exposed.

  However, when assembling an optical connector that can be directly attached to an optical cable, in order to reduce the size of the optical connector, the optical fiber core wire is removed or the bare optical fiber is removed at a position close to the optical cable sheath removal. It is necessary to perform cutting.

In such a case, in the conventional optical fiber core holder, the optical fiber core does not completely enter between the required sheath removal of the optical cable and the sheath removal of the optical fiber core, and the gap between them can be configured to be short. It was impossible, and a small optical connector could not be constructed.
Further, since the optical cable is generally more bent than the optical fiber core and the tape optical fiber core, when using the optical fiber core holder that holds the conventional optical fiber core wire, the optical fiber core wire is in operation. There existed problems, such as an optical cable and an optical fiber core wire removing from a holder, or an optical fiber breaking at the time of the sheath removal of an optical cable.

  Therefore, an optical cable holder as shown in FIG. 12 has been proposed by a part of the present applicant (Japanese Patent Application No. 2004-314329). The optical cable holder 10 includes a base 20 and a push lid 30 disposed on one surface 21 of the base 20.

  On one surface 21 of the base 20 on which the push lid 30 is disposed, an optical fiber core placement unit 25 and an optical cable storage unit 26 having continuous recesses are formed on a straight line 24 from one end 22 to the other end 23. The optical cable storage unit 26 is provided with an optical cable holding unit 27 that holds an optical cable sheath (not shown) disposed in the optical cable storage unit 26 from both sides.

  The optical cable holding part 27 may be arranged over the entire optical cable storage part 26, or may be installed in a part of the optical cable storage part 26 as shown. In the latter case, the bending of the optical cable is corrected in the optical cable storage unit 26, and the optical cable is held by the optical cable holding unit 27 installed in the optical cable storage unit 26. Therefore, the holding strength of the optical cable is more closely controlled. be able to. As a result, for example, after temporarily fixing the optical cable, it becomes possible to finely adjust the position of the optical cable so as to achieve the fiber core length and sheath removal length required in the connector assembly. Can be improved.

The pressing lid 30 facing the one surface 21 of the base 20 is rotatably attached to the side surface of the base 20 by a hinge (not shown) so as to cover the one surface 21 of the base 20.
An optical fiber core wire pressing portion 32 and an optical cable housing portion 33 are formed on one surface 31 of the pressing cover 30 that faces the one surface 21 of the substrate 20. When the pressing cover 30 covers the substrate 20, respectively. The optical fiber core wire placement unit 25 and the optical cable storage unit 26 are configured to cover the optical fiber core wire placement unit 25, and the optical fiber core wire placement unit 25 holds an optical fiber core wire of an optical cable (not shown). An optical cable housing gap capable of housing an optical cable sheath (not shown) is formed with the portion 33.
At this time, the optical fiber core placement unit 25 has a structure that can hold the number of optical fiber cores accommodated in the optical cable.

  As shown in FIGS. 13 and 14, a pair of optical cable holding portions 27 are formed in a wide space portion formed in a part of the optical cable storage portion 26 so as to be established from the bottom 28 of the optical cable storage portion 26 toward the surface thereof. ing. Further, as shown in FIG. 15, the interval between the pair of optical cable holding portions 27 is formed slightly narrower than the width of the sheath 4 of the optical cable 8 disposed in the optical cable storage portion 26, and between the pair of optical cable holding portions 27. When the optical cable 8 is disposed, the distance between the pair of optical cable holding portions 27 is expanded and the optical cable 8 can be fixed and held by the reaction.

  In order to hold the end portion of the optical cable 8 with such an optical cable holder 10, the sheath 4, the support wire 3, the tension member 2 and the like shown in FIGS. 1 is formed, and then the sheath 4 portion of the optical cable 8 is disposed in the optical cable housing portion 26 as shown in FIG. 15, and the exposed optical fiber core 1 is connected to the optical fiber. It arrange | positions at the core wire mounting part 25, and the push cap 30 is closed after that, and the optical cable 8 and the optical fiber core wire 1 are hold | maintained. Thereafter, the optical cable holder is disposed in an adapter housing portion of an optical fiber core coating removal tool or a bare optical fiber cutter (not shown) to remove the coating of the optical fiber core or to cut the bare optical fiber.

Japanese Patent Laid-Open No. 5-224023 JP 2001-133653 A JP 2002-162530 A Japanese Patent Laid-Open No. 2003-185884 JP 2004-145196 A

  However, in an actual construction site, for example, in the case of an optical connector mounting operation in an aerial closure, the trunk (upstream) side is an optical cable in which optical fiber tape cores are assembled, and the home (downstream) side is a drop cable. Both the work of attaching the optical connector to the optical fiber core wire from which the optical fiber tape core wire is separated and attaching the connector to the drop cable are required.

  However, the optical cable holder is suitable for the operation of connecting the drop optical cable. However, when the end processing of the optical fiber core on the main line side is performed, the optical cable holder has an optical cable thicker than the optical fiber core on the central axis. Since the optical cable housing portion for setting the optical fiber is formed, there is a first problem that it is difficult to set the optical fiber core wire. Further, since the optical cable holder has a structure for gripping the cable, the gripping force of only the optical fiber core wire is weak, and there is a second problem that the core wire sheath cannot be peeled off well when removing the core wire sheath.

The present invention has been made in view of the above points, and it is an object of the present invention to facilitate the setting of an optical fiber core wire by filling the optical cable storage portion, and to improve the gripping force of the optical fiber core wire. An optical fiber core wire holder that can be detachably set is provided.
The specific configuration of the present invention includes a rod-shaped body having a thickness to be fitted into the optical cable housing portion, a base on which the optical fiber core wire disposed on the rod-shaped body is placed, and the top of the base is covered. It is characterized by comprising a push lid.

  The optical fiber core wire holder of the present invention has a structure that can be set in the optical cable holder, and therefore, using the same jigs (core wire covering stripper and fiber cutter) for processing the end of the optical cable, with the same work feeling. Terminal processing of the optical fiber core wire can be performed.

The present invention can employ the following embodiments.
The push lid and the base are disposed only at the rear end of the optical fiber core holder. Thereby, the optical fiber core line arranged on the base can be pressed by sandwiching the press cover and the base from the outside by hand, a magnet for pressing the press cover on the base, etc. Is no longer necessary.
Furthermore, the groove in which the optical fiber core wire is disposed is not a V groove shape but a concave shape, the groove width is 0.5 mm or more, the groove depth is 0.15 mm to 0.2 mm, and the optical fiber core wire holding surface of the press cover Set the hardness of the rubber used to HS50 or higher. Thereby, an optical fiber core holder applicable to both a 0.25 mmφ optical fiber core wire and a 0.5 mmφ optical fiber core wire can be provided.

  The present invention will be described below with reference to the illustrated embodiments. In FIG. 1, reference numeral 40 denotes an optical fiber core holder 40 according to the first embodiment. The optical fiber core holder 40 is integrated with the rod-like body 41 in such a manner that it is mounted on the end of the rod-like body 41 and the rod-like body 41. The base 45 is formed on the base 45 and a push lid 50 that covers the surface of the base 45.

  The rod-like body 41 is formed to a thickness that can be fitted into the optical cable housing portion 26 shown in FIG. That is, the outer dimensions of the optical cable storage unit 26 are substantially the same as the cross-sectional area surrounded by the bottom and both side walls. A pair of protrusions 42 are formed on the other end on the side where the base is not disposed so that an optical fiber core wire (not shown) can be easily disposed on the surface of the rod-shaped body 41.

  The base 45 is formed with grooves 46 for placing optical fiber cores (not shown) on the surface, and a pair of projecting bodies 47 are formed at both ends of the grooves 46 with the grooves 46 interposed therebetween, not shown. When the optical fiber core wire is disposed in the groove 46, it can be easily disposed.

  The push lid 50 is attached to one side surface of the base 45 so as to be rotatable on the side surface of the base 45 by a hinge 52 so as to cover the groove 46 formed in the base 45. Further, when the side surface of the base 45 opposite to the side surface to which the hinge is attached is covered with the pressing lid 50, the pressing lid 50 is pressed from the side surface to hold the pressing lid 50 on the base 45. A holding piece 48 is formed for placing the holding piece.

  A plate-shaped rubber material 51 that can be elastically deformed is attached to the lower surface of the push lid 50 facing the surface of the base 45, and the push lid 50 covers the optical fiber core wire disposed in the groove 46 of the base 45. At this time, even if the outer diameter of the optical fiber core is different, the rubber material 51 is elastically deformed so that the optical fiber core can be fixed in the groove 46 with an appropriate pressure.

Next, the usage method of the optical fiber core wire holder of a present Example is demonstrated.
First, as shown in FIG. 2, the optical fiber core wire 55 for terminal treatment is inserted into the projections 42 and 47 formed at both ends of the groove 46 in a state of projecting to the projections 42 side. In this state, it is arranged in a straight line on the rod-shaped body and the base (also arranged on the groove at this time), and the push lid is closed in this state. FIG. 2 shows a state in which the push lid is closed.

  Next, the optical fiber cable holder of the present embodiment is fitted into the optical cable housing portion 26 of the optical cable holder. FIG. 3 shows an optical cable holder suitable for fitting the optical fiber core holder of the present embodiment. The optical cable holder shown in FIG. 3 is substantially the same as the optical cable holder shown in FIG. The same reference numerals are assigned to the same functional parts. In FIG. 3, reference numeral 29 denotes a holding piece for holding the pressing cover 30 from the side surface and holding the pressing cover 30 on the base 20 when the pressing cover 30 is put on the base 20. Reference numeral 34 denotes a hinge for holding the pushing lid 30 rotatably on the side surface of the base 20.

  Next, as shown in FIG. 4, the rod-like body 41 of the optical fiber core wire holder 40 shown in FIG. 2 is fitted into the optical cable housing portion 26 of the optical cable holder 10 shown in FIG. The optical fiber core wire holder 40 shown in FIG. 2 is shaded.

  The optical cable holder 10 in which the optical fiber core holder 40 is fitted in the optical cable housing portion 26 of the optical cable holder 10 in this way has the push cap 30 closed, and an optical fiber core sheath removal tool or a bare optical fiber not shown. Arranged in the adapter storage section of the cutter, the coating removal of the optical fiber core wire and the cutting of the bare optical fiber are performed.

FIG. 5 shows another embodiment of the present invention, in which the tip 41 'of the rod-like body 41 is formed wider than the optical fiber core holder 40 shown in FIG.
FIG. 6 shows an optical cable holder 10 suitable for fitting the optical fiber cable holder shown in FIG. 5 into the optical cable housing 26. The optical cable holder 10 is wider than the optical cable holder 10 shown in FIG. 3 so that the optical cable storage portion 26 formed in the center portion of the base 20 can store the rod-like body 41 having the tip portion formed wide. The difference is that it is formed in the enlarged space 26 '.

FIG. 7 shows a state in which the optical fiber core wire holder 40 shown in FIG. 5 is fitted in the optical cable housing portion 26 of the optical cable holder 10 shown in FIG. FIG. 7 shows the optical fiber core holder 40 shown in FIG. 5 with shading.
In this way, the tip end portion 41 ′ of the rod-like body 41 of the optical fiber core holder 40 is formed wide, and this wide portion is fitted into the enlarged space 26 ′ of the optical cable holder 10, thereby making the optical fiber core holder 40 The optical cable holder 10 can be fixed at a fixed position.

FIG. 8 shows the difference in the height of the mutual optical fiber cores when the optical fiber core wire 56 having an outer diameter of 0.25 mmφ and the optical fiber core wire 57 having an outer diameter of 0.5 mmφ are placed in the grooves 46 having different shapes. Is shown. 8 (a) shows the groove 46 having a V shape and the V groove forming angle of 60 degrees, and FIG. 8 (b) shows the groove 46 having a V shape and the V groove forming angle of 90 degrees. FIG. 8 (c) shows the groove 46 having a rectangular shape. As is clear from these figures, the difference in height between the optical fiber cores is the smallest in the case of the groove shape shown in FIG. Therefore, it is advantageous that the amount of elastic deformation of the rubber material 51 can be minimized when the push cap 30 is closed and the optical fiber core wire is held on the groove 46. Therefore, it is desirable to form the groove 46 in a rectangular shape.
At this time, it is desirable that the groove width is 0.5 mm or more, the groove depth is 0.15 mm to 0.2 mm, and the hardness of the rubber material 51 is HS50 or more. Thereby, the optical fiber core wire holder applicable to both a 0.25 mm diameter optical fiber core wire and a 0.5 mm diameter optical fiber core wire can be provided.

The optical fiber core wire holder in one Example of this invention is shown, (a) is a top view, (b) is a right view. FIG. 2 shows a state in which an optical fiber core is set in the optical fiber core holder shown in FIG. FIG. 2 shows an optical cable holder applied to the optical fiber core holder shown in FIG. 1, in which A is a plan view and B is a right side view. 2 shows a state in which the optical fiber core holder shown in FIG. 2 is fitted into the optical cable holder shown in FIG. 3, wherein A is a plan view and B is a right side view. The optical fiber core wire holder in the other Example of this invention is shown, A is a top view and B is a right view. FIG. 6 shows an optical cable holder applicable to the embodiment shown in FIG. 5, in which A is a plan view and B is a right side view. FIG. 6 shows a state in which the embodiment of FIG. 6 is fitted in the optical cable of FIG. 7, where A is a plan view and B is a right side view. (A) to (c) are explanatory diagrams illustrating characteristics of various groove shapes in the present invention. It is an end view which shows an example of a general drop optical cable. It is an end view which shows an example of the general drop optical cable of another example. It is explanatory drawing which shows the operation example of the optical fiber core wire holder in a prior art example. It is a perspective view which shows an example of the optical cable holder proposed previously. It is principal part structure drawing of the optical cable holder shown in FIG. It is a fragmentary sectional view of the optical cable holder shown in FIG. It is explanatory drawing which shows the operation example of the optical cable holder shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Optical cable holder 20 Base 21 One surface 22 One end 23 Other end 24 Straight line 25 Optical fiber core wire mounting part 26 Optical cable storage part 26 'Expansion space 27 Optical cable holding part 28 Bottom 30 Push lid 31 One side 32 Optical fiber core wire pressing part 33 Optical cable Storage unit 40 Optical fiber core wire holder 41 Rod-like body 41 'Tip portion 42 Protrusion 45 Base 46 Groove 47 Projection body 50 Push lid 51 Rubber material 55 Optical fiber core wire 56 Optical fiber core wire 57 Optical fiber core wire

Claims (3)

The optical cable housing portion of the optical cable holder, comprising: a base on which the optical fiber core wire placement portion and the optical cable housing portion are linearly arranged on the surface; and a push lid that covers the optical fiber core wire placement portion and the optical cable housing portion. In addition, an optical fiber core holder in which a rod-shaped body of the following components is fitted, the rod-shaped body is formed to have a thickness to be fitted in the optical cable housing portion, and the optical fiber core wire is placed on the rod-shaped body. An optical fiber core holder characterized in that a base is disposed, and a push lid covering the surface of the base is disposed on the surface of the base.   The optical fiber core wire holder according to claim 1, wherein the push lid and the base are disposed only at a rear end portion of the rod-shaped body.   A groove for arranging the optical fiber core wire is formed on the surface of the base, the shape of the groove is concave, the groove width is 0.5 mm or more, and the groove depth is 0.15 mm to 0.2 mm. An optical fiber core holder according to claim 1 or 2, wherein a rubber material for pressing the optical fiber core wire is disposed on the back surface of the push lid, and the hardness of the rubber material is HS50 or more. .

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