JPH10206651A - Fixing structure of optical fiber cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fixing structure which easily fixes an end part of an optical fiber cable in a casing and precisely keeps tension of optical fiber cable. SOLUTION: An end of optical fiber cable 10 is fixed to a block 50 by tightening tension-resistant object 12 with a band 55, the block 50 is stored in a block storing part 71 of a housing 70 such that the block 50 is avoided from moving in the direction of tension of optical fiber cable 10 by the fixing part 711, and the housing 70 is avoided from moving in the direction of tension of optical fiber cable 10 by a given wall surface 611b of a casing because the end of the housing 70 contacts with the wall surface 611b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber cable fixing structure suitable for processing the end of an optical fiber cable in which a large tension is generated such as an optical submarine fiber cable.

[0002]

2. Description of the Related Art FIGS. 7 and 8 show a conventional fixing structure for fixing an end of an optical submarine fiber cable to a housing of a communication device.

The optical fiber cable 10 is an optical fiber cable used for a long-distance relay system in which an intermediate repeater is provided for each predetermined span. As shown in FIG. 9, a plurality of optical fibers 11a are used. A large number of steel stranded wires (tensile members) 12 are arranged outside the assembled optical fiber assembly 11, and a copper tube 13 is provided outside the tensile members 12, and a resin jacket 14 is provided outside the copper tube 13. Is provided.

As shown in FIG. 7, a housing 20 to which the end of the optical fiber cable 10 is fixed has a housing body 21 formed of a sheet metal and a door 22 covering an upper opening of the housing body 21. It is configured. As shown in FIG. 8, a notch for introducing an optical fiber cable is provided on the front plate 211 of the housing main body 21 so that the end side can be positioned inside the housing main body 21 with the optical fiber cable 10 kept horizontal. Part 211a
Are formed from the upper end side of the front plate 211 to the central portion. A cable holding block 31 for fixing an intermediate portion of the optical fiber cable 10 introduced into the notch 211a is fixed to an outer wall surface of the front plate 211, and a resin or the like is fixed to a bottom surface 212 of the housing body 21. A pedestal 32 made of an insulating material is provided upright, and a metal block 35 for fixing an end of the optical fiber cable 10 is fixed to an upper surface of the pedestal 32.

[0005] To fix the optical fiber cable 10 to the housing 20, first, the optical fiber 11a and the copper tube 13 are exposed from the end of the optical fiber cable 10, and then the optical fiber cable 10 is placed directly above the notch 211a. Positioning the exposed portion of the copper tube 13 by inserting it into the concave portion 35 a having a semicircular cross section formed in the metal block 35,
Further, by positioning the metal band 37 so as to cover the upper side of the copper tube 13 and fixing both ends of the metal band 37 to the metal block 35 with screws 38, the optical fiber cable 1
0 is fixed, and an intermediate portion of the optical fiber cable 10 is covered with a metal band 39.
Is fixed to the block 31 with screws 40. Further, by fixing the high-voltage cable 41 to the metal block 35 with the screw 42, the high-voltage cable 41 and the copper tube 13 are electrically connected, and power is supplied to an intermediate relay device (not shown).

In the above fixing structure, the tension of the optical fiber cable 10 is received by the metal block 35 and the metal band 37 sandwiching the copper tube 13 and the strength member 12, and the metal block 35 is attached to the bottom surface 212 of the housing body 21. It is configured to be supported by a fixed base 32. Here, since the metal block 35 connected to the high-voltage cable 41 is in an exposed state, dust adheres to the metal block 35 and its surroundings, and a sufficient insulation between the metal block 35 and the housing 20 is obtained. Is not obtained, a discharge may occur between both 35 and 20. In order to avoid this discharge, it is conceivable that the pedestal 32 as an insulator is raised to increase the distance D between the housing bottom surface 212 and the copper tube 13. However, in this type of optical submarine fiber cable 10,
Since the tension F becomes very large due to the weight of the optical submarine fiber cable itself, a large moment called FD acts on a fixed portion between the pedestal 32 and the housing bottom surface 212. For this reason, the resin pedestal 32, whose strength is weaker than that of metal, may be damaged by the moment FD.

Further, the work of screwing the end of the optical fiber cable 10 needs to be performed in a narrow housing, so that the workability is poor.

[0008]

As described above, in the conventional optical fiber cable fixing structure, the pedestal and the metal block which are erected in the housing in a state orthogonal to the direction of the tension acting on the optical fiber cable. Therefore, there is a problem that a large moment acts on a fixed portion between the housing and the pedestal, and the pedestal having a low strength is damaged. In addition, there is a problem that electric discharge is easily generated between the high-potential metal block and the metal housing due to dust adhering around the metal block, and a screwing operation of an end portion of the optical fiber cable which needs to be performed in the housing. There was a problem that it was complicated.

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional drawback, and an end of an optical fiber cable can be easily fixed in a housing, thereby securely supporting the tension of the optical fiber cable. It is another object of the present invention to provide a fixing structure for an optical fiber cable which can be used and has excellent insulation properties.

[0010]

According to the first aspect of the present invention, there is provided an optical fiber cable fixing structure for fixing an end of an optical fiber cable to a housing of a communication device, wherein a state in which a tensile strength member of the optical fiber cable is covered is provided. And a block body to which the end of the optical fiber cable is fixed by screwing the band, and a block body storage section for storing the block body at one end side are provided from the block body storage section to the other end side. A groove for accommodating the optical fiber cable is formed as described above, and a locking portion that abuts on the block body to prevent the block body from moving toward the other end due to the tension of the optical fiber cable. Is provided, and an end surface of the other end of the housing provided in the housing abuts a predetermined wall surface of the housing,
And a pedestal for positioning and holding the housing such that a straight line connecting the one end side and the other end side of the housing is substantially orthogonal to the predetermined wall surface, and the predetermined surface formed on the predetermined wall surface of the housing. And a cable introduction port for introducing the optical fiber cable into a groove of the housing attached to the wall surface.

According to the second aspect of the present invention, there is provided a strength member surrounding the optical fiber assembly and a metal tube surrounding the strength member, and the end of the optical fiber cable to which power is supplied to the tube is communicated. In the fixing structure of an optical fiber cable fixed to a metal housing of an apparatus, an end portion of the optical fiber cable is fixed by screwing a metal band that covers the tube, and the tube is A metal block to which a power supply cable for supplying power to the body is connected, and a block body storage portion for housing the metal block provided on one end side, and the light is supplied from the block body storage portion to the other end side. A groove for accommodating a fiber cable is formed, and movement of the metal block toward the other end side by the tension of the optical fiber cable is performed on the metal block. An insulating housing provided with an engaging portion for preventing contact with the housing; an insulating housing provided in the housing; an end surface on the other end side of the housing abutting on a predetermined wall surface of the housing; A pedestal having an insulating property for positioning and holding the housing in a state where a straight line connecting the one end side and the other end side is substantially orthogonal to the predetermined wall surface, and formed on the predetermined wall surface of the housing; And a cable inlet for introducing the optical fiber cable into a groove of the housing attached to a predetermined wall surface.

According to a third aspect of the present invention, in the second aspect of the invention, the housing is provided with an insulating cover for covering the metal block housed in the block body housing.

[0013]

According to the first aspect of the present invention, the end portion of the optical fiber cable is fixed to a block by tightening a strength member by a band, and the block is in a direction in which the tension of the optical fiber cable acts. The housing is stored in the block housing portion of the housing in a state where the movement of the optical fiber cable is stopped by the locking portion, and the end of the housing is brought into contact with a predetermined wall surface of the housing so that the tension of the optical fiber cable is reduced. Since movement in the direction of action is prevented by the predetermined wall surface of the housing, the optical fiber cable is supported without causing a moment due to the tension of the optical fiber cable to the member fixing the end of the optical fiber cable to the housing. can do. In addition, since the optical fiber cable can be introduced into the groove of the housing from the cable inlet formed in the housing, even if the block is fixed to the optical fiber cable, the block is attached to the housing attached to the housing. And the end side of the optical fiber cable.

According to the second aspect of the present invention, the metal tube of the optical fiber cable is electrically connected to the metal tube by being tightened with the metal band and the metal block. By connecting a power supply cable to the power supply, power can be supplied to the metal tube. Although the housing is insulated between the metal block having a high potential and the metal casing, even if the housing is formed of a resin that is inferior to metal in terms of strength, a moment due to the tension of the optical fiber cable remains in the housing. Since no action is taken, the optical fiber cable can be securely held by the housing.

According to the third aspect of the present invention, since the metal block is covered with the insulating cover, in addition to the function of the second aspect, no dust adheres to the metal block and its surroundings. Therefore, it has the effect of ensuring reliable electrical insulation between the metal block and the metal housing.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to FIGS. FIG. 1 is an exploded perspective view showing a fixing structure of the optical fiber cable, FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1 in a state where the end of the optical fiber cable is fixed to the housing, and FIG. 2 is a sectional view taken along line BB of FIG. 2, and FIG.
FIG. 5 is a sectional view taken along a line, and FIG.
FIG. 6 is an exploded perspective view showing the fixing of the end of the optical fiber cable to the metal block.

The optical fiber cable 10 according to the fixed structure of the present embodiment is an optical fiber cable used for a long-distance relay line similar to the conventional example, and has a plurality of optical fibers as shown in FIG. A large number of strength members 12 made of steel stranded wires are provided outside the optical fiber assembly 11 in which the fibers 11a are gathered, and a copper tube 13 serving as a power supply tube is provided outside the strength members 12. A resin jacket 14 is provided outside the copper tube 13. Then, as shown in FIG. 1, the end of the optical fiber cable 10 is fixed to a metal block 50, and the optical fiber cable 10 to which the metal block 50 is attached is provided in a housing 70 provided in a housing 60 of the communication device. The end portion of the optical fiber cable 10 is fixed to the housing 60 by being stored in the housing, and the power supply cable 80 is connected to the metal block 50, so that the intermediate relay device (not shown) is Voltage power is supplied. Hereinafter, the configuration of each part will be described.

The metal block 50 is, as shown in FIG.
A substantially “L” is formed by a flat plate portion 51 having a plurality of screw holes 51 a and 51 b formed therein and a wall portion 52 erected on the flat plate portion 51.
The flat plate portion 51 is formed with a concave portion 51d having a half-surface cross section having a curvature corresponding to the curvature of the peripheral surface of the copper tube 13 of the optical fiber cable, and the concave portion 5d is formed in the wall portion 52.
A groove 52a is formed so that the copper tube 13 can be positioned at 1d. Then, from the end, the copper tube 13 and the optical fiber 1
In the optical fiber cable 10 from which the 1a is exposed, the copper tube 13 is positioned in the concave portion 51d and the resin jacket 14 is
Of the copper tube 13 is covered with a metal band 55, and both ends of the metal band 55 are fixed to the flat plate portion 51 by screws 56. Is fixed to the metal block 50 by being fixed to the portion of the screw hole 51a. Also,
A lug terminal 81 of a power supply cable 80 is fixed to the screw hole 51 b of the metal block 50 with a screw 82, and the power supply cable 80 is electrically connected to the copper tube 13 via the metal block 50.

The housing 70 is formed in a rectangular shape with resin. On one end side of the housing 70 in the longitudinal direction, a block body storage portion 71 formed of a concave portion having a size capable of fitting the metal block 50 from the flat plate portion 51 side.
Is formed, and the housing 70 is
A groove 72 having a width that allows the optical fiber cable 10 to be inserted from the radial direction is formed so as to reach the other end of the optical fiber cable 10. Further, a guide groove 73 for guiding both edges of a resin plate-shaped cover 75 is formed on the upper side of the opening of the block body storage portion 71 and the groove 72, and as shown in FIG. By being inserted into the guide groove 73, it is attached to the housing 70 so as to cover the opening on the upper side of the block body storage portion 71 and the groove 72.

As shown in FIG. 2, the housing 60 includes a housing main body 61 formed of sheet metal and a metal door 62 that covers an upper opening of the housing main body 61. Housing body 6
The front plate 611 has an inlet 612 for the optical fiber cable 10 from the upper end of the front plate 611 at a central position so that the terminal side can be positioned in the housing body 61 while the optical fiber cable 10 is kept horizontal. Is formed. Further, a cable holding block 85 for fixing a middle portion of the optical fiber cable 10 introduced into the introduction port 612 is fixed to the outer wall surface 611a side of the front plate 611,
The housing 70 is provided inside the housing main body 61 such that the longitudinal direction of the housing 70 is orthogonal to the front plate 611.
The end surface 70a on the other end side of the front side is the inner wall surface on the front side (predetermined wall surface)
Two pedestals 87 and 88 are provided for mounting the housing 70 such that the opening of the groove 72 faces upward with the groove 72 coinciding with the introduction port 612 while abutting on the 611b.

The pedestal 87 is formed in an approximately "U" shape with an insulator such as a resin, and is fixed to the inner wall surface 611b of the front plate 611 with screws or the like. A notch 87a large enough to fit the other end of the housing 70 is formed at the center of the pedestal 87. As shown in FIGS. The end is fitted into the notch 87a, and the end face 70a is brought into contact with the front plate 611. The pedestal 88 is also formed of an insulator such as a resin, and stands on the bottom surface 615 of the housing body 61.
As shown in FIGS. 2 to 5, the pedestal 88 is formed with a concave portion 88 a having a shape capable of fitting one end of the housing 70 and supporting the one end. Accordingly, the housing 70 has one end fitted into the recess 88a of the pedestal 88 and the other end fitted into the notch 87a of the pedestal 87,
The end face 70a is attached to the housing body 61 in a state where the end face 70a contacts the front plate 611.

The end of the optical fiber cable 10 is fixed to the housing 60 as follows. First, as shown in FIG. 6, the optical fiber 11a and the copper tube 13 are stripped from the end of the optical fiber cable 10, the copper tube 13 is fixed to the metal block 50 by the metal band 55, and the power supply cable 80 is Connect to block 50. Next, as shown in FIG. 1, the optical fiber cable 10 is introduced into the housing main body 61 from the cable inlet 612, and
The metal block 50 is housed in the block body housing part 71 of No. 0, and the end side of the optical fiber cable 10 is housed in the groove 72. Next, the cover 75 is inserted into the guide groove 73 of the housing 70 to cover the upper opening of the block body storage portion 71 and the groove 72. Further, the lid 68 is attached to the front plate 611 of the housing body 61 to close the cable introduction port 612, and the metal band 90 is screwed to the cable holding block 85 as shown in FIGS. Fix the middle part of. With this, the fixing of the end of the optical fiber cable 10 is completed. As the next step, the extra length processing and wiring of the optical fiber cable 11a are performed, and the door 62 is closed.

As described above, in the fixing structure according to the present embodiment, the screwing operation of the optical fiber cable 10 can be performed outside the housing 60, and the optical fiber cable 10 with the metal block is fitted into the housing 70 in the housing 60. The work can be easily performed because it only needs to be inserted. The tension of the optical fiber cable 10 is determined by the end surface (locking portion) 711 of the wall 52 of the metal block 50 formed in the block housing portion 71 of the housing 70.
Since the housing 70 itself receives the end face 70 a of the front plate 611 of the housing body 61, the large tension of the optical fiber cable 10 acts only as a compressive force on the housing 70. Therefore, even if the housing 70 is formed of a resin that is inferior to metal in strength, the housing 70 is not damaged. Also, the housing 7
Optical fiber cable 1
Since the zero tension does not act, the pedestals 87 and 88 only need to have a strength enough to position and hold the housing 70 at a predetermined position. In addition, since the metal block 50 to which the high-voltage power supply cable 80 is connected is covered with the housing 70 and the cover 75 formed of an insulator, dust does not adhere to the metal block 50 and its surroundings. Therefore, reliable electrical insulation between the metal block 50 and the metal housing 60 can be ensured.

In the above embodiment, the termination of the optical submarine fiber cable 10 used for the long-distance separated relay line has been described. The present invention can also be used for fixing the end of an optical fiber cable that does not require a tube. In such a case, the strength member of the optical fiber cable is replaced with a block body corresponding to the metal block 50 and the metal band 55 of this example. Secure to band.

[0025]

As described above, according to the first aspect of the present invention, only the compressive force due to the tension of the optical fiber cable acts on the housing for fixing the end of the optical fiber cable to the housing via the block body. Since no moment due to tension acts on the optical fiber cable, the optical fiber cable can be reliably supported even if the housing is formed of resin or the like whose strength is lower than that of metal. Further, after the optical fiber cable is screwed to the block body, the optical fiber cable can be fixed only by fitting the optical fiber cable with the block body into the housing in the housing, so that the fixing operation of the optical fiber cable can be easily performed.

According to the second aspect of the present invention, the metal tube of the optical fiber cable is electrically connected to the metal tube by being tightened with the metal band and the metal block. By connecting the power supply cable to the power supply, power can be supplied to the metal tube. Although the housing is insulated between the metal block having a high potential and the metal casing, even if the housing is formed of a resin that is inferior to metal in terms of strength, a moment due to the tension of the optical fiber cable remains in the housing. Since it does not act, the housing also has the effect that the optical fiber cable can be securely held.

According to the third aspect of the present invention, since the metal block is covered with the insulating cover, in addition to the effect of the second aspect, no dust adheres to the metal block and its surroundings. This has the effect that reliable electrical insulation between the metal block and the metal housing can be ensured.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a fixing structure of an optical fiber cable according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along line AA of FIG. 1 in a state where an end of the optical fiber cable is fixed to a housing.

FIG. 3 is a sectional view taken along line BB of FIG. 2;

FIG. 4 is a sectional view taken along line DD of FIG. 2;

FIG. 5 is an enlarged view of a circle E in FIG. 3 with a cover removed.

FIG. 6 is an exploded perspective view showing the fixing of the end of the optical fiber cable to the metal block.

FIG. 7 is a cross-sectional view showing a conventional optical fiber cable fixing structure.

FIG. 8 is an exploded perspective view showing a conventional optical fiber cable fixing structure.

FIG. 9 is a sectional view of an optical submarine fiber cable.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Optical fiber cable 11a ... Optical fiber 12 ... Tensile body 13 ... Tube 50 ... Metal block 55 ... Metal band 60 ... Housing 61 ... Housing main body 611b ... Predetermined wall surface 612 ... Cable inlet 70 ... Housing 70a ... End surface 71: Block body storage section 711: Locking section 72: Groove 75: Cover 80: Power supply cable 87, 88: Base

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Sumitomo Kotani, Inventor Sumio Kotani 2-3-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo International Telegraph and Telephone Corporation (72) Inventor Tadashi Kobayashi 2-2-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo No. Kokusai Telegraph and Telephone Corporation (72) Inventor Eiichi Shibano 2-3-2 Nishishinjuku, Shinjuku-ku, Tokyo International Telegraph and Telephone Corporation

Claims (3)

[Claims] In a fixing structure of an optical fiber cable for fixing an end of an optical fiber cable to a housing of a communication device, a band that covers a strength member of the optical fiber cable is screwed into the optical fiber cable. A block body to which an end of the optical fiber cable is fixed, and a block body storage section for storing the block body at one end side, and a groove for housing the optical fiber cable extending from the block body storage section to the other end side. And a housing provided with an engaging portion for preventing the block body from moving toward the other end side by the tension of the optical fiber cable by contacting the block body to prevent the block body from moving toward the other end. The end face on the other end side of the housing is in contact with a predetermined wall surface of the housing, and a straight line connecting the one end side and the other end side of the housing is a point. A pedestal for positioning and holding the housing in a state substantially orthogonal to a fixed wall surface, and introducing the optical fiber cable into a groove of the housing formed on the predetermined wall surface of the housing and attached to the predetermined wall surface. An optical fiber cable fixing structure, comprising: 2. A tensile strength member surrounding the optical fiber assembly and a metal tube surrounding the tensile strength member, and an end of an optical fiber cable to which power is supplied to the tubular body is provided at a metal housing of a communication device. In the fixing structure of the optical fiber cable, the end of the optical fiber cable is fixed by screwing a metal band covering the tube, and power is supplied to the tube. A metal block to which a power supply cable for connection is connected, and a block housing portion for housing the metal block on one end side, and a groove for housing the optical fiber cable from the block body housing portion to the other end side. Is formed, and a locking portion that abuts on the metal block to prevent the metal block from moving toward the other end due to the tension of the optical fiber cable is provided. An insulating housing provided, provided in the housing, an end surface of the other end of the housing abutting on a predetermined wall surface of the housing, and the one end and the other end of the housing A pedestal having an insulating property for positioning and holding the housing in a state where a straight line connecting them is substantially orthogonal to the predetermined wall surface, and the pedestal formed on the predetermined wall surface of the housing and attached to the predetermined wall surface. A cable inlet for introducing the optical fiber cable into a groove of the housing. 3. The optical fiber cable fixing structure according to claim 2, wherein an insulative cover for covering the metal block housed in the block housing is attached to the housing.