JP2004062020A - Anchor structure of optical cord - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the thickness of an anchor section and to strengthen an anchor capacity when an optical cord having, successively from a center, a coated optical fiber, an inner tube, a tension fiber layer, and an external coating is anchored to a case. <P>SOLUTION: The optical cord 10 is stripped stepwise in order of the external coating 24, the tension fiber layer 22, and the inner tube 20 and the portion undergoing the stepwise stripping is stuck to a bottom plate 26 of the case between pins 38 rising from the bottom plate 26 by a double coated adhesive tape of the width extending over the inner tube 20. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for securing an optical cord to a part of a case.
[0002]
2. Description of the Related Art When an optical cord is introduced into a case and the optical fiber core of the optical cord is connected to the other end of the optical fiber or an optical component in the case, an external force is applied to the optical cord. However, in order not to adversely affect the optical fiber core wire or the like in the case, it is necessary to keep the optical cord in a part of the case.
Conventionally, as means for securing the optical cord to the case, (1) a method of attaching a metal ring to the optical cord by caulking and fixing the metal ring to the case, and (2) an elastic material such as rubber or sponge. There is a method in which a slit member is attached to a case and an optical cord is sandwiched and fixed in the slit.
[0004]
The method of using a metal ring has a problem that the drawing force is strong, but the finished size is large, the drawing operation is complicated, and the cost is high. Moreover, the method using a slit elastic member has the difficulty that a retention force is weak.
An object of the present invention is to provide an optical cord retaining structure that solves the above-described problems.
[0006]
The optical cord retaining structure according to the present invention holds an optical cord having an optical fiber core, an inner tube, a tensile fiber layer, and an outer sheath in order from the center. The optical cord is stepped off in the order of the outer sheath, the tensile strength fiber layer, and the inner tube, and at least the tensile strength fiber layer of the stepped portion is attached to the bottom plate of the case with an adhesive tape. is there.
The optical cord retaining structure according to the present invention preferably uses a double-sided pressure-sensitive adhesive tape as the pressure-sensitive adhesive tape, and a protective cover affixed on the double-sided pressure-sensitive adhesive tape.
When a plurality of optical cords are to be held, a plurality of stripped portions of the optical cords are arranged in parallel, and a double-sided adhesive tape is collectively wound around the arrangement portion, and the double-sided adhesive tapes are adjacent to each other. It is preferable that a configuration is adopted in which the pins that rise from the bottom plate of the case between the optical cords are attached to the bottom plate of the case.
[0009]
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings.
FIG. 1 and FIG. 2 show an embodiment of an optical cord retaining structure according to the present invention. In the figure, 10 is an optical cord, 12 is a case, 14 is a double-sided adhesive tape, and 16 is a protective cover.
As shown in FIG. 3, the optical cord 10 has an optical fiber core wire 18, an inner tube 20, a tensile strength fiber layer 22, and an outer sheath 24 in order from the center. The portion of the optical cord 10 that is fastened to the case 12 is stepped off in the order of the outer sheath 24, the tensile fiber layer 22, and the inner tube 20.
The case 12 is in the form of an optical fiber core wire extra length storage case as shown in FIG. In FIG. 4, 26 is a bottom plate, 28 is a peripheral wall, 30 is an optical cord retaining portion, 32 is a core guide frame that rises from the bottom plate 26, 34 is a holding portion for the optical fiber core connection portion, and 36 is an optical fiber core wire protruding It is a prevention piece. From the bottom plate 26 of the optical cord retaining section 30, pins 38 rise in two rows at a predetermined interval. The case 12 may have other forms.
In this embodiment, the four optical cords 10 are collectively secured to the case 12. The stepped portions of the four optical cords 10 are arranged in parallel so as to be inserted one by one between the pins 38 of the case 12, and the double-sided adhesive tape 14 is wrapped around the arrayed portion as shown in FIG. . The double-sided pressure-sensitive adhesive tape 14 has a width that allows the double-sided adhesive tape 14 to be adhered across the outer sheath 24, the tensile strength fiber layer 22, and the inner tube 20.
The double-sided adhesive tape 14 wound around the stepped portion of the optical cord 10 is affixed to the bottom plate 26 between the two rows of pins 38 of the case 12 as shown in FIGS. Of course, the optical cord 10 is inserted between the pins 38 at this time. Further, a protective cover 16 made of metal or plastic is attached on the double-sided adhesive tape 14. This completes the retention of the optical cord 10.
With such a retaining structure, the outer covering 24 of the optical cord 24, the tensile strength fiber layer 22 and the inner tube 20 are fixed to the bottom plate 26 of the case 12 by the double-sided adhesive tape 14, respectively, so that a strong retaining force can be obtained. It is done.
In the above embodiment, the case where four optical cords are collectively retained has been described, but it is also possible to retain optical cords one by one. The protective cover 16 is provided to prevent adhesion of dust and the like, and can be omitted. In addition, the case where the exterior covering, the tensile strength fiber layer, and the inner tube of the stepped part are attached to the case with the double-sided adhesive tape has been described. Also good.
[0017]
As described above, according to the present invention, the optical cord is stepped off and the exterior covering, the tensile fiber layer, and the inner tube are each fixed to the case with an adhesive tape. Can be obtained, and the reliability of the retention can be improved. Moreover, a thin retaining structure can be obtained as compared with the case of using a metal ring, and the case can be downsized.
[Brief description of the drawings]
FIG. 1 is a plan view showing an embodiment of an optical cord retaining structure according to the present invention.
2 is a cross-sectional view of the retaining structure of FIG.
FIG. 3 is a perspective view showing a stepped portion of an optical cord.
FIG. 4 is a plan view showing an example of a case.
FIG. 5 is a perspective view showing a state in which a double-sided adhesive tape is wrapped around a stepped portion of an optical cord and a protective cover is placed thereon.
[Explanation of symbols]
10: Optical cord 12: Case 14: Double-sided adhesive tape 16: Protective cover 18: Optical fiber core wire 20: Inner tube 22: Tensile fiber layer 24: Outer sheath 26: Bottom plate 30: Optical cord retaining portion 38: Pin

Claims (3)

An optical fiber having an optical fiber core, an inner tube, a tensile fiber layer, and an outer sheath are secured to the case in order from the center, and the optical cord is stripped in the order of the outer sheath, the tensile fiber layer, and the inner tube. An optical cord retaining structure, wherein at least the tensile fiber layer of the stepped portion is attached to the bottom plate of the case with an adhesive tape. 2. The optical cord retaining structure according to claim 1, wherein a double-sided pressure-sensitive adhesive tape is used as the pressure-sensitive adhesive tape, and a protective cover is attached to the upper surface of the double-sided pressure-sensitive adhesive tape. A plurality of stripped portions of the optical cord are arranged in parallel, and a double-sided adhesive tape is wrapped around the arrayed portion in a lump, and this double-sided adhesive tape is placed between the pins rising from the bottom plate of the case between adjacent optical cords. 3. The optical cord retaining structure according to claim 1, wherein the optical cord is attached to a bottom plate of the case.

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