JPH0727446Y2 - Tension member fixing structure for optical connector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a fixing structure for a tension member that is a member of an optical fiber cord in an optical connector.

[Conventional technology]

FIG. 7 is a sectional view of a main part having a tension member fixing structure in a conventional optical connector, and FIG. 8 is a sectional view of a main part showing an operation of a conventional example.

In FIG. 7 and FIG. 8, 1 is an optical fiber cord, and a core wire 2 for propagating an optical signal in the center and a tension member 3 made of synthetic resin so as to cover the core wire 2 Is covered with the outer cover 1a and is incorporated in the cord longitudinal direction. Then, the core wire 2 and the tension member 3 are exposed at a predetermined length from the jacket 1a at the tip of the optical fiber cord 1.

Reference numeral 4 denotes a cylindrical main body, which is attached to the exposed tip end of the core wire 2 to cover and protect the periphery of the core wire 2 and to fix the tension member 3 to the rear end side. The fixed portion 4a has a diameter smaller than that of the other portions.

Reference numeral 5 denotes an element that fits around the outer periphery of the body 4 so as to cover the body 4, and the element 5 is inscribed in the body housing hole 5a for housing and holding the body 4 and the outer diameter of the optical fiber cord 1. A mounting hole 5b having an inner diameter for mounting the optical fiber cord 1 is provided in communication with the main body housing hole 5a.

Reference numeral 6 denotes a crimping ring as a crimping member that is fitted to the fixing portion 4a of the main body 4 and used for fixing the tension member 3 of the optical fiber cord 1, and is made of metal.

With the structure described above, in order to fix the tension member 3, first, the crimping ring 6 is passed through the optical fiber cord 1 in advance.

Then, the plurality of tension members 3 exposed from the jacket 1a of the optical fiber cord 1 are provided on the peripheral surface of the fixing portion 4a of the main body 4 attached to the tip of the core wire 2 which is also exposed from the jacket 1a. , Evenly cover and spread.

Next, the caulking ring 6 which was previously penetrated to the optical fiber cord 1 side is moved toward the main body 4, and the fixing portion of the main body 4 is fixed.
The caulking ring 6 is fitted into the fixing portion 4a such that the tension member 3 is sandwiched by the 4a and the caulking ring 6.

After that, the caulking ring 6 was crushed into a uniform cylindrical shape by a caulking tool (not shown) and crimped, whereby the tension member 3 was fixed between the fixing portion 4a and the caulking ring 6.

Then, in order to protect the connecting portion between the optical fiber cord 1 and the main body 4, at the corresponding positions in the element 5, that is, the main body 4 is in the main body accommodating hole 5a, and the optical fiber cord 1 has an outer diameter By fitting the optical fiber cord 1 in the main body 4 into the element 5 by fitting the mounting hole 5b inscribed therein.
The optical connector is held inside the optical connector, and the tension member in the optical connector is fixed.

[Problems to be solved by the device]

However, according to the above-described conventional technique, there is a step of spreading the tension member evenly around the fixed portion of the main body, covering the tension member with caulking, and then crimping the main body with a dedicated tool.

The amount of optical connectors used in recent years has increased with the increase in the number of devices that handle optical signals, and simplification of assembly and economicization of members have been demanded. Therefore, the work of caulking each main body is appropriate. It wasn't a process.

That is, in order to perform the caulking work as described above, first, the fixing ring must be made of metal, and thus the component price becomes expensive. There is also a problem that a dedicated tool for crushing and crimping the metal requires a large pressing force, which is a difficult work.

Furthermore, since the crimping process crushes and deforms the crimping ring, the pressing portion also receives the pressing portion of the main body,
The fixing portion needs to have sufficient strength, so that if the main body is made of metal, the price becomes more expensive. In addition, if the main body is made of synthetic resin for low cost, the thickness of the fixed part must be increased in order to obtain strength, and therefore the size of the connector in the radial direction becomes large, which results in high-density mounting. There was a problem that it was not suitable for.

Therefore, the present invention has been made to solve the above-mentioned problems, and it is possible to fix an optical connector by enabling the tension member to be fixed without applying a pressing force for crimping the tension member to the fixing portion of the main body. Achieving simplification of assembly, economical use of the main body made of cheap synthetic resin, and miniaturization of the connector size that had been increased to cope with the pressure contact force during the crimping process. To aim.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention provides an optical fiber cord in which a core wire whose tip is exposed with a predetermined length and a tension member are supported in the center of a cylindrical outer sheath, and a core of the optical fiber cord. In a tension member fixing structure in an optical connector for fixing a main body having a fixing portion for holding an exposed end of a wire therethrough and fixing a tension member, in the optical member, wherein the caulking member is a metal thin plate in the center. Is bent to form a V-shape, and a through hole is provided at the center of the bent portion of the V-shape.

On the other hand, a plurality of fixing portions of the main body are provided on the peripheral surface of the main body so that they can be surface-bonded to the surface of the caulking member, and a plurality of bundled tension members are passed through the rear end of the fixing portion. A locking portion having a groove portion is provided.

[Action]

With the configuration described above, when the core exposed from the tip of the optical fiber cord is inserted and held in the main body, the tip of the jacket of the optical fiber cord and the rear end of the main body face each other.

In this state, a plurality of tension members exposed from the optical fiber cord are evenly bundled according to the number of fixing portions formed on the peripheral surface of the main body, and the bundled tension members are fixed to the caulking member. It is inserted between the V-shaped plate materials.

The inserted tension member penetrates into the through hole provided in the fold portion of the caulking member, which confirms that the tension member is securely inserted into the caulking member.

Then, the caulking member is caulked from above and below with a caulking tool to fix the tension member, and then the caulking member is arranged in the fixing portion of the main body while penetrating the tension member fixed to the caulking member into the groove portion of the locking portion.

In this way, the caulking member arranged in the fixing portion has one end on the side to which the tension member is connected locked with the locking portion, whereby the tension member is securely fixed to the main body.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

1 is a sectional view of an essential part showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is a structural view of a caulking member according to this embodiment.

1 to 3, reference numeral 1 denotes an optical fiber cord, which is formed by coating a core wire 2 and a tension member 3 arranged so as to cover the core wire 2 with an outer cover 1a. The core wire 2 and the tension member 3
Is exposed from the outer cover 1a with a predetermined length.

Reference numeral 7 denotes a main body which is attached to the tip of the core wire 2 exposed from the tip of the outer cover 1a so as to cover the core wire 2 so as to protect the core wire 2, and the rear end side of the main body 7 has a cylindrical shape. A pair of upper and lower horizontal smooth surfaces 7a different from the other portions are provided, and the smooth surfaces 7a serve as a fixing portion for fixing the tension member 3.

Further, 7b is a locking portion that is formed to project in the radial direction at the rear end of this smooth surface 7a, and in this embodiment, it is formed so as to have a diameter that is substantially the same as the outer diameter of the main body 7 and that is approximately at the center thereof. It has a groove portion 7c.

Reference numeral 8 denotes a caulking member for fixing the tension member 3 arranged on the smooth surface 7a of the main body 7, and the caulking member 8 is a third caulking member.
As shown in the figure, a thin metal plate is folded in half from the center to form a V shape, and a through hole is formed in the center of the fold.
Have 9a.

Reference numeral 9 is an element that fits around the outer periphery of the main body 7 so as to cover the main body 7. The element 9 is inscribed in the main body storage hole 9a for storing and holding the main body 7 and the outer diameter of the optical fiber cord 1. A mounting hole 9b having an inner diameter for mounting the optical fiber cord 1 is formed in communication with the main body housing hole 9a.

The operation of the present embodiment having the above-described structure will be described below with reference to FIGS. 1 to 3 and a sectional view of the essential portions showing the operation of the present invention shown in FIG.

When the core wire 2 exposed from the tip of the optical fiber cord 1 is inserted and held in the main body 7, the sheath of the optical fiber cord 1 is covered.
The tip of 1a faces the fixed portion 7a on the rear end side of the main body 7.

In this state, the tension members 3 of the optical fiber cord 1 are evenly divided into two bundles, and the plurality of bundled tension members 3 are V-shaped of the caulking member 8 as shown in FIG.
It is inserted between the plate materials bent in a letter shape, and is passed through a through hole 8a provided in the fold portion. Thereby, it can be confirmed that the tension member 3 is surely inserted between the plate members facing each other of the caulking member 8.

Next, the caulking member 8 is caulked from above and below with a caulking tool (not shown) to fix the tension member 3 to the caulking member 8. Here, the tension member 3 protruding through the through hole 8a of the caulking member 8 is cut.

Then, the tension member 3 fixed to the caulking member 8
Is passed through a groove portion 7c provided in the locking portion 7b of the main body 7, and one end side of the caulking member 8 is placed on the fixing portion 7a so as to abut against the locking portion 7b.

As a result, the tension member 3 is securely fixed to the main body 7.

After that, in order to protect the connecting portion between the optical fiber cord 1 and the main body 4, in the corresponding positions in the element 9, that is, the main body 7 is in the main body accommodating hole 9a, and the optical fiber cord 1 is the outer diameter thereof. By fitting the optical fiber cord 1 with the main body 7 by fitting it into the mounting hole 9b inscribed in the element 9
An optical connector is formed by being held inside.

The present invention is not limited to the above-mentioned embodiment, but may have a structure as shown in FIGS. 5 and 6.

FIG. 5 is a cross-sectional view of an essential part showing another embodiment of the main body structure, in which a locking part 8b for locking the caulking member 8 is fixed to a fixing part.
A bent portion 8d is provided so as to cover a part above 7a.
According to this, the caulking member 8 can be more reliably locked to the fixing portion 7a.

FIG. 6 is a cross-sectional view of an essential part showing another embodiment in the crimping process, in which the surface of the crimping tool 10 for crimping the crimping member 8 has a serrated waveform, and the crimping member 8 is crimped for crimping. By crimping, the crimping member 8 is formed into a corrugated shape. According to this, the tensile strength of the tension member 3 can be enhanced.

Further, other various modifications are possible, for example, a pair of fixing portions may be provided at two or more places, and the tension member 3 protruding through the through hole 8a of the caulking member 8 may be provided. Instead of cutting, it is possible to bend the caulking member 8 to a surface in contact with the fixing portion 7a, place the caulking member 8 on the fixing portion 7a in this state, and sandwich the crimping member 8 and the fixing portion 7a. .

[Effect of device]

As described above, according to the present invention, the caulking member is formed by bending a thin metal plate member from the center to form a V shape, and
A through hole is provided at the center of the bent portion of the letter shape, and a plurality of fixing portions of the main body are provided on the peripheral surface of the main body so as to be surface-bondable to the surface of the caulking member, and the plurality of fixing portions are provided at the rear end of the fixing portion. It is arranged to be provided in a locking portion having a groove portion for penetrating the bundled tension members.

Thus, when fixing, the tension member is inserted between the V-shaped plate members of the caulking member, and after caulking with a caulking tool, the tension member is arranged at the fixing portion of the main body, so that it is locked and fixed to the locking portion. Therefore, the pressing force at the time of caulking the tension member to the caulking member is not applied to the fixing portion of the main body, and the main body does not receive unnecessary pressing force.

Therefore, the main body can be made of synthetic resin, and it is not necessary to increase the thickness of the fixing portion, so the size of the main body in the radial direction can be reduced, which is cheap and economical and mass producible. Moreover, it is possible to obtain a structure capable of realizing high-density mounting.

Further, since the caulking member is locked in the pulling direction of the optical fiber cord by the locking portion provided at the rear end of the main body, the tensile strength of the optical fiber cord is also strengthened.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, FIG. 3 is a structural view of a caulking member according to this embodiment, and FIG. Is a cross-sectional view of an essential part showing the operation of the present invention, FIG. 5 is a cross-sectional view of an essential part of another embodiment, FIG. 6 is a cross-sectional view of an essential part of another embodiment, and FIG. FIG. 8 is a cross-sectional view of the main part shown, and FIG. 8 is a cross-sectional view of the main part showing the conventional operation. 1 ... Optical fiber cord, 2 ... Core wire 3 ... Tension member, 7 ... Main body 7a ... Fixed part, 7b ... Locking part 7c ... Groove part, 8 ... Caulking member 8a ... Through hole, 9 ... Element

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Ryo Nagase 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation (72) Kazunori Kanayama 1-1-6 Uchiyuki-cho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation

Claims (1)

[Scope of utility model registration request] 1. An optical fiber cord comprising a core and a tension member, the tip of which is exposed at a predetermined length, and a tension member supported at the center of a cylindrical jacket, and an exposed core of the optical fiber cord is held therethrough. And a main body having a fixing portion for fixing the tension member,
In a tension member fixing structure in an optical connector for fixing via a caulking member, the caulking member is formed by bending a thin metal plate from the center to form a V shape, and a through hole is provided in the center of the bent portion of the V shape. The fixing portion of the main body is provided at a plurality of positions on the peripheral surface of the main body so that the fixing portion of the main body can be surface-bonded to the surface of the caulking member, and the plurality of bundled tension members are passed through the rear end of the fixing portion. A tension member fixing structure for an optical connector, characterized in that a locking portion having a groove portion is provided.