JPH1096832A - Optical fiber-cord connector of simple mounting type - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical fiber-cord connector of a simple mounting type which substantially prevents the occurrence of defects and may be rapidly and easily assembled. SOLUTION: The optical fiber-cord connector 10 has a ferrule member 80 for housing the end of a coated fiber 21 extending from the end of a coated optical fiber cord 2. The front end of this ferrule member 80 is inserted and fixed into a plug frame 171. A caulking tube 90 fixes a connector 81 on the root side of the ferrule member 80 and the coated end 2a of the optical fiber cord 2. The plug frame 171, the ferrule member 80, etc., are housed in a rubber hood 73 and a knob 72. The ferrule member 80 formed by integrally mounting a conventional stop ring and spring to a ferrule is used in such a manner and the connector 81 on the root side of the ferrule member 80 and the coated end 2a of the optical fiber cord 2 are fixed to each other by the single caulking tube 90 and, therefore, the number of the parts may be decreased while the assembly strength of conventional connectors is maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a simple mounting type single fiber optical connector.

[0002]

2. Description of the Related Art Conventionally, as this type of single-core optical fiber connector, for example, a simple mounting type SC type optical connector as shown in FIG. 5 is known. This simple attachment type SC type optical connector includes a ferrule 3 for accommodating the end of a fiber 21 extending from the cord end of the coated optical fiber cord 2, and the ferrule 3 holding the ferrule 3 via a spring 41. A stop ring 4 for urging in the distal direction. Ferrule 3 and stop ring 4
Is inserted into the plug frame 71 and fixed. The caulking ring 5 fixes the stop ring 4 and the Kevlar 22 extending from the coated end 2a of the optical fiber cord 2 to each other, and the ring 6 comprises the caulking ring 5 and the optical fiber cord 2.
And the covering end 2a are fixed to each other. Plug frame 7
1, the spring 4, the caulking ring 5 and the like are accommodated in the knob 72 and the rubber hood 73.

[0005] A specific assembling procedure of the simple mounting type SC optical connector of FIG. 5 will be outlined.

[0004] First, a rubber hood 73, a ring 6, a caulking ring 5, a stop ring 4, and a spring 41 are passed through these five parts from the cord end of the optical fiber cord 2. Next, the coating of the end portion of the optical fiber cord 2 is removed to remove the fiber core 21 and the Kevlar 22.
And expose. Next, the end of the fiber core 21 is inserted into the ferrule 3 and these are fixed with an adhesive.
Then, the tip of the ferrule 3 is polished.

[0005] Next, the stop ring 4 is moved to the distal end side to accommodate the base end side of the ferrule 3 and the spring 41 in the stop ring 4, and in this state, the ferrule 3 and the stop ring 4 are inserted into the plug frame 71. Attach.
At the time of mounting, the protrusion 4 provided on the stop ring 4
a is fitted into an elongated hole formed on the side surface of the plug frame 71 and locked.

Next, an adhesive is applied to the periphery of the knurled portion 4b of the stop ring 4, and a Kevlar 22 is spread over the knurled portion 4b and placed thereon. The ring 4 and the Kevlar 22 are fixed. Furthermore, a small-diameter portion 5 on the base end side of the caulking ring 5.
An adhesive is applied to the periphery of the small-diameter portion 5b, and a coating that has been cut and spread in advance at the coating end 2a of the optical fiber cord 2 is placed around the small-diameter portion 5b.

Finally, an elastic rubber hood 73 is put on the plug frame 71, the stop ring 4, and the like, and inserted into the knob 72 from the tip end of the plug frame 71 to complete the assembly of the simple mounting type SC optical connector.

The reason why the optical fiber cord 2 and the stop ring 4 are carefully connected using the caulking ring 5 or the ring 6 is that the Kevlar 22 or the coating of the optical fiber cord 2 is fixed to the stop ring 4 side. The optical fiber cord 2 is prevented from being directly loaded, and has a certain strength against the tensile load applied to the optical fiber cord 2.

[0009]

However, since the conventional simple mounting type SC type optical connector has a large number of parts, when the ferrule 3 is passed through before being mounted, it may be necessary to forget the parts or to make a mistake in the pre-sequence order. Failure may occur. Another problem is that it takes a considerable amount of time to assemble. Further, there is a problem that the skill is required for the worker because the work is complicated.

Accordingly, the present invention provides a semiconductor device in which defects are less likely to occur,
It is an object of the present invention to provide a simple mounting type single core optical fiber connector which can be easily assembled in a short time.

[0011]

According to a first aspect of the present invention, there is provided a single-fiber optical fiber connector of a simple attachment type having a substantially cylindrical shape having a first locking portion substantially at the center of an outer peripheral portion thereof. A ferrule body that is formed and accommodates and holds a fiber core exposed at the cord end of the optical fiber cord, and is fitted around the base end of the ferrule body in a substantially cylindrical shape so as to be slidable along its axial direction. A connecting body having a second locking portion formed on the distal end side, and the connecting body and the ferrule main body being attached between the first locking portion and the second locking portion to separate from each other. A ferrule member having an urging member for urging the ferrule main body in a direction in which the ferrule main body is slidably accommodated in the axial direction thereof; First locked portion that prevents movement to the side A second locked portion that locks and fixes the second locking portion in a state where the first locking portion is locked to the first locked portion by the biasing force of the biasing member. A plug frame having a portion, a connection body which is externally arranged from the connection body to the covering end of the optical fiber cord, and is caulked and fixed to the connection body and the covering end,
An elastic hood that accommodates the ferrule member, the plug frame, and the connector, and has a base end in close contact with the coated end of the optical fiber, and is connected to the plug frame so as to cover the distal end of the elastic hood. An easy-to-attach single-fiber optical fiber connector comprising:

According to a second aspect of the present invention, there is provided a single-fiber optical fiber connector of a simple attachment type, wherein a flange is formed in an annular shape around a distal end side of the connection body, and the flange is formed around the flange. A pair of protrusions is formed as the second locking member at an opposing position around and an interpolating position interpolating the opposing position, and the pair of protrusions are arranged at positions opposing each other on the plug frame. It is characterized by being able to engage with both holes.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described. FIG. 1 shows the structure of a simple mounting type single core optical fiber connector according to an embodiment of the present invention.
FIG. 1A is an exploded view, and FIG. 1B is a completed view. As can be seen from the drawing, the single-core optical fiber connector 10 has a ferrule member 8 for accommodating an end of a fiber core 21 extending from an end of the coated optical fiber cord 2.
0 is provided. The distal end side of the ferrule member 80 is inserted and fixed in the plug frame 171. The connecting body 81 provided on the base side of the ferrule member 80 and the covering end 2a of the optical fiber cord 2 are mutually connected and fixed by a caulking tube 90 which is a connecting body. The plug frame 171 and the ferrule member 80 are housed in the rubber hood 73 and the knob 72.

FIG. 2 shows the structure of the ferrule member 80. FIG. 2A is a front view of the distal end side, and FIG. 2B is a side view. The ferrule member 80 accommodates and holds the exposed end of the fiber core 21, and accommodates the base end side of the ferrule body 82 in a cylindrical shape and is slidable in the axial direction with respect to the ferrule body 82. And a simple connecting body 81.

The ferrule main body 82 includes a distal end portion 82a fitted into a sleeve of an adapter (not shown) interposed when the single-core optical fiber connector 10 is connected to another single-core optical fiber connector, and a base end side. And a supporting shaft portion 82b that slidably supports the connecting body 81. Around the support shaft portion 82b, in addition to the connection body 81,
A coil spring 84 as an urging member is arranged. One end of the coil spring 84 is fixed to a flange-shaped portion 83 which is a first locking portion fixed around the boundary between the distal end portion 82a and the support shaft portion 82b. Are fixed to a flange 86 serving as a second locking portion formed around the distal end of the connecting body 81. As a result, when the flange portion 83 and the flange portion 86 are to be brought closer to each other by a predetermined distance or more, the two springs 83 and 86 receive a force separating from each other by the coil spring 84. That is, when the connecting body 81 is displaced toward the distal end side in the axial direction with respect to the ferrule main body 82 to further accommodate the base end side of the ferrule main body 82, the connecting body 81 has an axial base end repelling thereto. A bias is applied to the side.

The connecting body 81 slidably fitted on the ferrule main body 82 has an outer diameter substantially equal to that of the coated end 2 a of the optical fiber cord 2. And the connecting body 81
Around the flange 86 formed at the distal end of the pair, two pairs of projections 86a, 86a, 86b, 86b are erected. One protrusion pair 86 arranged at a position facing each other
a and 86a, and the other pair of projections 86b and 86b arranged at positions interpolating with them, will be described in detail later.
Can be engaged with a pair of elongated holes which are locked portions of the above.

The provision of the four pairs of protrusions 86a, 86a, 86b, 86b extending around the flange 86 as described above is because the eccentric position is set when the fiber core 21 is a single mode optical fiber. This is to clarify.
That is, measured beforehand whether fiber 21 is eccentric in advance in any direction, the two sets of projections pair 86a, 86a,
If any of the protrusions 86b, 86b is marked, the eccentric direction of the fiber core 21 and the fiber core constituting a mating single-core optical fiber connector (not shown) to be connected via an adapter. Can be easily matched with each other, and the loss due to the eccentricity can be minimized.

FIG. 3 shows the structure of the plug frame 171. 3A is a plan view of the distal end side, FIG. 3B is a front view, and FIG. 3C is a side view.

A pair of long holes 171a, which are second locked portions, are formed on the base end sides of both side surfaces of the plug frame 171. These elongated holes 171a have two pairs of projections 86a, 86a, 86b, 8 formed around the flange 86 of the ferrule member 80 inserted into the plug frame 171.
6b is fitted and locked.

At this time, the flange portion 83 fixed around the center of the ferrule main body 82 comes into contact with a partition wall 171g formed at the center in the plug frame 171 and is prevented from moving toward the distal end in the axial direction. You. Here, the partition wall 171g is
As the first locked portion, the ferrule main body 82 is positioned in the axial direction. That is, the plug frame 1
With the ferrule member 80 attached to the inside 71, the flange portion 83, that is, the ferrule main body 82 is urged toward the distal end in the axial direction, and the flange 86, that is, the connecting body 81 is urged toward the proximal end in the axial direction. It will be. However, the ferrule main body 82 is slidable against the plug frame 171 in the axially proximal end side against the urging force. In addition,
An opening having a diameter corresponding to the diameter of the distal end portion 82a is formed in the center of the partition wall 171g to pass the distal end portion 82a of the ferrule main body 82.
This is for centering the ferrule main body 82 with respect to the plug frame 171.

A notch 171d extending in the axial direction is formed on the upper and lower surfaces of the base end side of the plug frame 171. The notch 171 extends in a direction perpendicular to the notch 171d.
e is also formed. The notch 171e has two pairs of projections 86a, 86 formed around the flange portion 86 of the ferrule member 80 inserted into the plug frame 171.
a, 86b, and 86b are engaged and locked.

Ribs 171h, 171h are formed on both sides of the plug frame 171 near the center end. When the plug frame 171 is inserted into the knob 72 shown in FIG. 1 and the plug frame 171 is to be moved to the distal end side of the knob 72 after assembly, the ribs 171h and 171h have the rod-shaped stopper 7
The plug frame 171 is prevented from moving toward the distal end by contacting the plug frame 2a. Further, projections 171j, 171j are formed near the center base end side of both side surfaces of the plug frame 171. When the plug frame 171 is inserted into the knob 72 shown in FIG. 1 and the plug frame 171 is moved to the base end side of the knob 72 after the plug frame 171 is inserted into the knob 72 shown in FIG.
The plug frame 171 abuts on the proximal side edge of b and prevents the plug frame 171 from moving in the proximal direction.

Hereinafter, a specific assembling procedure of the single-core optical fiber connector of the embodiment will be described.

First, from the end side of the optical fiber cord 2,
These parts are passed first in the order of the rubber hood 73 and the swaging tube 90. Next, the coating on the end of the optical fiber cord 2 is removed to expose the fiber core 21 and the Kevlar 22. Next, the end of the fiber core 21 is inserted into the tip side of the ferrule member 80, and these are fixed with an adhesive. Then, the tip of the ferrule member 80 is polished.

Next, the ferrule member 80 is mounted in the plug frame 171. Specifically, the tip of the ferrule main body 82 is inserted into the plug frame 171, and inserted until the flange portion 83 of the ferrule main body 82 is locked to the partition wall 171 g of the plug frame 171. Further, the connector 81 is pushed in against the urging force of the coil spring 84, and the elongated holes 171a on both sides of the plug frame 171 are pressed.
Then, a pair of protrusions 86a formed around the flange 86 is fitted. At this time, the notch 171 on the upper and lower surfaces of the plug frame 171
e, a projection 86b formed around the flange 86,
86b is fitted. As a result, the ferrule member 80 is locked in the plug frame 171 while being urged toward the distal end.

Next, the coated end 2a of the optical fiber cord 2 is fixed to the ferrule member 80. FIG. 4 illustrates a specific fixing method. An adhesive is applied to the mesh knurled portion 87 on the surface of the connection body 81, and
Spread 2 in a flared shape and cover it with a flare-like Kevlar 2
An adhesive is applied to the periphery of the optical fiber cord 2 and the periphery of the coated end 2a of the optical fiber cord 2. Then, the caulking tube 90 is moved until the knurled portion 87 is covered, and the caulking tube 90 is caulked at two places on the side of the connecting body 81 and the coating end 2a side of the optical fiber cord 2, and the connecting body 81 and the optical fiber cord 2 are connected. And the covering end 2a are fixed to each other.

Finally, the base end of the plug frame 171
The cylindrical rubber hood 73 is moved around the ferrule member 80 and the like to cover them, and the plug frame 171 is inserted into the knob 72 from the distal end side thereof and locked to the same.
The assembly of the single-core optical fiber connector 10 is completed.

Although the connecting member 81 is firmly connected to the Kevlar 22 and the coated end 2a of the optical fiber cord 2, the ferrule main body 82 itself is free with respect to the connecting member 81. Thus, instantaneous interruption of optical communication when a tensile stress is applied to the optical fiber cord 2 from outside can be prevented.

The single-core optical fiber connector 1 of the above embodiment
0, a conventional ferrule member 80 in which a stop ring or a spring is integrally attached to the ferrule is used, and a single caulking tube 90 is used to connect the base body 81 of the ferrule member 80 and the coated end 2a of the optical fiber cord 2. Are fixed to each other, so that the number of parts can be reduced while maintaining the conventional assembly strength. Therefore, when the parts are passed through before the ferrule member 80 is attached, the possibility of occurrence of defects such as forgetting of parts and an incorrect pre-sequencing order is reduced, and the time required for assembly is reduced. Etc. can be increased.

Although the present invention has been described with reference to the specific embodiments, the present invention is not limited to the above embodiments. For example, the caulking tube 90 is connected to the connecting body 81.
Instead of fixing at two locations on the side and the coated end 2a side, it is also possible to use a wide caulking jig and fix it at one location from the connector 81 to the coated end 2a of the optical fiber cord 2.

[0031]

As described above, in the single-fiber optical fiber connector of the simple attachment type according to the first aspect, the first locking portion is formed in a substantially cylindrical shape and substantially at the center of the outer peripheral portion thereof. A ferrule main body for housing and holding the fiber core exposed at the cord end; a substantially cylindrical outer fitting slidably disposed along the axial direction at the base end of the ferrule main body; A connecting body having a locking portion formed thereon, and a connecting member attached between the first locking portion and the second locking portion to urge the connecting body and the ferrule main body in a direction away from each other. A ferrule member having a biasing member and the ferrule main body are slidably received in the axial direction thereof, and the first locking portion is locked to prevent the ferrule main body from moving toward the distal end in the axial direction. A first locked portion and an urging force of the urging member The more the first locking portion first
A plug frame having a second locked portion that locks and fixes the second locking portion in a state where the second locked portion is locked to the locked portion, and from the connection body to the coated end of the optical fiber cord. A connector, which is arranged outside and is fixed by caulking to the connector and the covering end, and accommodates the ferrule member, the plug frame, and the connector,
Since an elastic hood whose base end is in close contact with the coated end of the optical fiber and a knob connected to the plug frame so as to cover the distal end of the elastic hood are provided, the number of components can be reduced. Therefore, when the components are passed through before the ferrule member is attached, defects such as forgetting of the components and an error in the passing sequence are less likely to occur, and the time required for assembly is reduced.

[Brief description of the drawings]

FIG. 1 is an exploded view and a completed view showing a structure of a simple mounting type single-core optical fiber connector according to an embodiment of the present invention.

FIG. 2 is a front view and a side view of a ferrule member constituting the single-core optical fiber connector of FIG. 1;

FIG. 3 is a plan view, a front view, and a side view of a plug frame constituting the single-core optical fiber connector of FIG. 1;

FIG. 4 is a diagram illustrating a part of an assembling process of the single-core optical fiber connector of FIG. 1;

FIG. 5 is an exploded view showing the structure of a conventional single-core optical fiber connector.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 2 Optical fiber cord 2a Coated end 10 Single-core optical fiber connector 21 Fiber core wire 72 Knob 73 Rubber hood 80 Ferrule member 81 Connecting body 82 Ferrule main body 83 Flanged portion 84 Coil spring 86 Flanged portion 90 Caulking tube 171 Plug frame

Claims (2)

[Claims] A first cylindrical member having a substantially cylindrical shape and a substantially central portion at an outer peripheral portion thereof;
A ferrule body for holding and holding the fiber core exposed at the cord end of the optical fiber cord, and a substantially cylindrical slidable along the axial direction on the base end side of the ferrule body. A connecting body having a second locking portion formed on the distal end side thereof, and the connecting body and the ferrule main body attached between the first locking portion and the second locking portion. A ferrule member having an urging member for urging the ferrule in a direction away from the ferrule, accommodating the ferrule main body slidably in the axial direction thereof, and locking the first locking portion to form the ferrule. A first locked portion that prevents movement of the main body toward the distal end in the axial direction, and the first locking portion is locked to the first locked portion by an urging force of the urging member. A second locked portion that locks and fixes the second locking portion in a state. A plug frame, a connection body that is fitted externally from the connection body to the covering end of the optical fiber cord, and is caulked and fixed to the connection body and the covering end, respectively; the ferrule member, the plug frame, and the An elastic hood, which accommodates the connected body and has a base end in close contact with the coated end of the optical fiber, and a knob connected to the plug frame so as to cover the distal end of the elastic hood. Easy-to-install single-core optical fiber connector. 2. A flange portion is formed annularly around the distal end side of the connection body, and an opposing position around the flange portion and an interpolation for interpolating the opposing position are provided around the flange portion. And a pair of protrusions is formed as the second locking member at each of the positions, and the pair of protrusions can engage with holes arranged at positions facing each other on the plug frame. The simple mounting type single fiber optical connector according to claim 1.