JP2005181737A - Optical connection structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable a worker to connect optical fibers to each other easily and safely, without damaging a substrate mounted with the optical fibers and adapters, and components mounted on the substrate. <P>SOLUTION: Two pieces of connection members 3, 3 having optical fibers 2 are mounted to face each other on an upward open type adapter 1, and the connection member 3 is fixed in the direction vertical to the adapter 1, by mounting a connection fixing member 4 on the adapter 1. The connection fixing member 4 is provided with a part opening downward, formed into a C-shape and provided with guide pieces opposing each other across the opening part. When the connection member 3 is mounted on the adapter 1, the connection fixing member 4 with the connection member 3 mounted on the adaptor 1, by making the adapter 1 and the connection member 3 to penetrate through the connection fixing member 4 and making the guide pieces engage with the slide grooves 1a of the adapter 1. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an optical connection structure, and more particularly to an optical connection structure suitable for connecting single-core and multi-core optical fibers.

A push-pull system that facilitates insertion and removal of the optical fiber in the axial direction has been proposed. For single-core connection, FC, SC, MU, LC, etc., for multi-fiber connection, MPO, MPX, MTP type, etc. Connection parts are used.
Since these push-pull connectors are inserted and removed in the axial direction of the optical fiber to be connected, the optical fiber can be easily connected for connection with an adapter attached to the apparatus wall such as a backplane. However, when used for connecting an optical fiber on a printed circuit board (for example, a mother board) or in an apparatus, the operator's view in the insertion / removal direction is deteriorated, which may increase the work time.

  Also, since the connection direction parallel to the optical fiber axis direction and the insertion / extraction direction are the same direction and a stable holding force is required, the insertion / extraction force needs to be increased, and when engaging with a latch, When releasing the connection, there is a risk that the adapter installed on the board due to overloading or the board itself may be damaged, or the optical fiber connection parts may come into contact with the surrounding parts due to reaction and damage the optical fiber or surrounding parts. there were.

In order to solve the above problems, an optical connector for attaching a plug from above the adapter has been devised. The optical fiber is pressed against the alignment member by a spring member, and the optical fiber is pressed against the alignment member and fixed (hereinafter referred to as the first). In addition, after being mounted on the adapter from above, it is moved in the optical fiber axial direction, and the adapter and the plug are fitted by a latch (referred to as a second conventional example). In addition, devices that have been devised so that optical connection of optical fibers can be performed well have been proposed. Further, as an apparatus related to this type, for example, an apparatus that connects and disconnects optical fibers by aligning fitting pins. Proposed (see, for example, Patent Document 1) and parts for fixing an optical fiber have been proposed (for example, see Patent Document 2).
(See Patent Documents 1 and 2).
JP 2000-258862 A (page 3-6, FIGS. 1 to 9) JP 2001-66464 A (page 2-4, FIG. 1 to FIG. 13)

However, in the first conventional example, when a pressing force is applied from above, the pressing force also acts on the substrate via the adapter, so that bending stress acts on the substrate and the optical component mounted on the substrate. In some cases, electronic components may come off or be damaged from the board, and in a serious case, the board itself may be damaged.
Further, in the second conventional example, an insertion / extraction force in the optical fiber axial direction for engaging the latch is required, and the problem from the current push-pull type has not been solved.
On the other hand, although those described in Patent Documents 1 and 2 have been devised for optical connection, as in the first and second conventional examples, consideration is given to the problem that pressing force acts on the substrate during connection. Was not.
None of the devices described in Patent Documents 1 and 2 considers the relationship between the optical fiber and the substrate, and therefore does not consider the problem of pressing force against the substrate at the time of connection.

  The present invention has been made in consideration of such circumstances, and the purpose thereof is to facilitate the connection work between optical fibers. An object of the present invention is to provide an optical connection structure that can be easily and safely performed without damaging components mounted on a substrate.

In order to achieve the above object, the present invention proposes the following means.
According to the first aspect of the present invention, a connecting member having at least one optical fiber mounted thereon is mounted on an upper open type adapter having a shape with an open upper side, and the axial direction of the optical fiber is mounted on the adapter. The connection component is pressed and fixed in a state where the optical fibers are abutted with each other by a connection fixing member slidably attached to the optical fiber.
The invention according to claim 2 is the optical connection structure according to claim 1, wherein the connection member is attached to a plug.
The invention according to claim 3 is the optical connection structure according to claim 2, wherein the connection member is slidable with respect to the plug.
According to a fourth aspect of the present invention, in the optical connection structure according to any one of the first to third aspects, the optical fiber is pressed in the axial direction of the optical fiber, and the opposite ends of the optical fibers are pressed against each other. Means are provided.
The invention according to claim 5 is the optical connection structure according to claim 4, wherein the pressing means is a spring.
According to a sixth aspect of the present invention, in the optical connection structure according to any one of the first to fifth aspects, an optical fiber alignment means for abutting opposite ends of the optical fibers is provided.
According to a seventh aspect of the present invention, in the optical connection structure according to the sixth aspect, the optical fiber alignment means is configured such that the connection fixing member slides in the axial direction of the optical fiber on the adapter, and the connection members are connected to each other. It is characterized by matching.
The invention according to claim 8 is the optical connection structure according to any one of claims 1 to 7, wherein the optical fiber has two connection members facing each other when the connection fixing member slides on the adapter. In any one of the connecting members, the optical fibers passing through the other connecting member are abutted against each other and connected.
The invention according to claim 9 is the optical connection structure according to any one of claims 6 to 8, wherein the optical fiber alignment means includes a fiber introduction groove provided in the adapter, and the adapter direction in the connection member. And a movable member provided so as to be movable.
The invention according to claim 10 is the optical connection structure according to any one of claims 6 to 8, wherein the optical fiber alignment means is provided in the connection member so as to be movable in the adapter direction; It is characterized by comprising a fiber introduction groove provided in the lower part of the moving member and the adapter.
The invention according to claim 11 is the optical connection structure according to any one of claims 1 to 10, wherein the connection fixing member or the connection member includes a pressing member that presses the optical fiber in the adapter direction. To do.
The invention according to claim 12 is the optical connection structure according to claim 11, wherein the pressing member is a rotatable cam member or a rotating body.
The invention according to claim 13 is the optical connection structure according to any one of claims 1 to 12, further comprising a grip portion for sandwiching the opposing connection member along the axial direction of the optical fiber. .

  According to the first aspect of the present invention, the connection member can be attached to the adapter from the vertical direction, and the fixing force of the connection member to the adapter and the connection pressing force between the optical fibers can be set in different directions. Therefore, when performing the connection work from the visual field direction (above) of the connection worker, not only can the optical components and electronic components mounted on the board be prevented from being detached, but also the board itself can be damaged. It is possible to prevent this, and the effect that the connection work can be performed easily and satisfactorily is obtained. For this reason, the yield is improved and the connection work efficiency is improved.

  According to the second aspect of the present invention, the connection member is attached to the plug, thereby preventing the end of the connection member and the end of the optical fiber from being contaminated by the contact of hands or other components. The effect that can be obtained.

  According to the third aspect of the present invention, the end of the connecting member can be positioned on the inner side from the tip of the plug by sliding the connecting member with respect to the plug. The effect that can reduce the possibility of that is obtained.

  According to the fourth aspect of the present invention, when the pressing means presses the optical fiber in the axial direction, the ends of the opposing optical fibers can be butted against each other, and a good optical connection can be easily obtained.

  According to the invention which concerns on Claim 5, since the press means consists of springs, the effect which can implement | achieve the optical connection of an optical fiber reliably with a simple structure is acquired.

  According to the sixth aspect of the present invention, since the ends of the optical fibers facing each other can be brought into contact with each other by the optical fiber alignment means, an effect of realizing a good optical connection can be obtained.

  According to the seventh aspect of the invention, since the optical fibers can be brought into contact with each other by sliding the connection fixing member in the axial direction of the optical fiber, an effect of realizing a good optical connection can be obtained.

  According to the eighth aspect of the present invention, since the optical fibers facing each other inside any one of the connection members are connected to each other, an effect of easily connecting the optical fibers can be obtained.

  According to the ninth aspect of the present invention, the connection fixing member that has slid on the adapter presses the moving member in the direction of the adapter and pushes the optical fiber into the fiber introduction groove to fix it, so that a good optical connection can be realized. An effect is obtained.

  According to the invention of claim 10, since the connection fixing member slid on the adapter pushes the moving member in the adapter direction, and pushes and fixes the optical fiber into the fiber introduction groove, it is possible to realize an excellent optical connection. can get.

  According to the invention of claim 11, when the connection fixing member slides on the adapter in the axial direction of the optical fiber, the moving member is pressed onto the adapter, so that the optical fibers are satisfactorily abutted by the moving member. The effect that can be obtained.

  According to the twelfth aspect of the present invention, since the pressing member is a rotatable cam member or rotating body, there is an effect that the optical fiber can be easily pressed to the adapter side by rotating the cam member or the rotating body. can get.

  According to the thirteenth aspect of the present invention, since the connecting member facing the grip portion is sandwiched along the axial direction of the optical fiber, the connecting members can be reliably abutted with each other, and the optical fibers are also abutted with each other with certainty. Thus, an effect of improving the reliability as an optical connection structure can be obtained.

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 are views showing an optical connection structure according to the first embodiment of the present invention.
In this optical connection structure shown in FIG. 1, two connection members 3 and 3 to which an optical fiber 2 is attached are mounted relative to an upper open type adapter 1 formed by opening the upper side. As the connection fixing member 4 is slid and attached to the adapter 1, the opposing connection members 3 are pressed against each other in the vertical direction with respect to the adapter 1, and can be abutted against each other. Yes. Side walls 1b and 1b are formed upright at both ends of the adapter 1 in the longitudinal direction.

  As shown in FIG. 2, the connection fixing member 4 is formed in a substantially C shape in which an opening 4a is provided below and guide pieces 4b and 4b are provided so as to face each other across the opening 4a. When the connecting member 3 is mounted on the adapter 1 so as to face the adapter 1, the adapter 1 and the connecting member 3 are inserted and the guide pieces 4 b and 4 b are engaged with the slide groove 1 a of the adapter 1. 1 is slidably mounted along its longitudinal direction.

  At this time, the adapter 1 is provided with a spring 5 such as a leaf spring as a pressing means, and the two connecting members 3 and 3 are pushed in the axial direction of the optical fiber 2 by the elastic force of the spring 5. By receiving pressure, they can be matched.

A connection example of such an optical connection structure will be described below with reference to FIGS.
FIG. 3 shows an example of a connection example. In FIG. 3, first, the optical fiber 2 is attached to the two connection members 3, and in this state, the two connection members 3 are mounted and opposed to the adapter 1 from above (FIG. 3 (a). Then, the adapter 1 is inserted into the connection fixing member 4 from one side so that the guide piece 4b of the connection fixing member 4 is aligned with the slide groove 1a of the adapter 1, and the connection fixing member 4 is placed on the adapter 1 in this state. When the connection fixing member 4 is arranged so as to slide between the two connection members 3, 3, the connection fixing member 4 presses the two connection members 3 downward against the adapter 1 and fixes them. At the same time (FIG. 3B), the connecting members 3 and 3 are pressed against each other in the axial direction of the optical fiber 2 by the elastic force of the spring 5, so that the optical fibers 2 of both the connecting members 3 are well-matched. Will be connected .

FIG. 4 shows another example of the connection example. In FIG. 4, the connection fixing member 4 is mounted in advance on the adapter 1, and after the connection fixing member 4 is slid to one end side of the adapter 1 (FIG. 4A), the adapter 1 is moved to the other end side. One connecting member 3 to which the optical fiber 2 is attached is attached (FIG. 4B).
Next, after sliding the connection fixing member 4 to the other end side so as to cover the connection member 3 on the adapter 1, the other connection member 3 having the optical fiber 2 mounted on one end side of the adapter 1 is mounted. Then, the connecting members 3 are made to face each other (FIG. 4C). After that, when the connection fixing member 4 is slid to the center side of the adapter 1 and arranged between the two connection members 3 and 3 (FIG. 4D), the connection fixing member 4 connects the two connection members 3 to the adapter. Since the connecting members 3 and 3 are pressed against each other in the axial direction of the optical fiber 2 by the elastic force of the spring 5, the optical fibers 2 of both the connecting members 3 are connected to each other. It will be connected well.

  That is, as described above, since the connecting member 3 is attached to the adapter 1 in a direction perpendicular to the connecting direction of the optical fiber 2, the insertion / extraction force of the connector which is the connecting member 3 and the connecting pressing force of the optical fiber 2 are separated. Since the direction can be set, each can be realized with the minimum necessary fixing force, and the connection work can be easily performed.

  Further, when the connection member 3 is mounted on the adapter 1 from above, a latch is not used as in the conventional example, and the fixing force of the connection member 3 to the adapter 1 is reduced by the connection fixing member 4 and the adapter. Since the process is performed between the two, no pressing force is applied to the board to which the adapter 1 is attached from above, and there is no risk of the board being damaged. Even in the connected state, stress due to the fixing force of the connecting member 3 does not remain on the substrate, so that the substrate can be prevented from being deformed.

  Therefore, according to this embodiment, when connecting the optical fiber 2 on a printed circuit board (for example, a mother board) or in the apparatus, the connection member 3 can be attached to the adapter 1 from the vertical direction. Since the fixing force and the connection pressing force between the optical fibers 2 can be set in different directions, the optical component mounted on the board or the like when the connection work is performed from the visual field direction (upward) of the connection operator. Not only can the electronic components be prevented from coming off, but also the substrate itself can be prevented from being damaged, and the connection operation can be performed easily and satisfactorily. Therefore, the yield is improved and the connection work efficiency is improved.

5 and 6 show an optical connection structure according to the second embodiment of the present invention.
In this embodiment, as shown in FIG. 5, the connection member 3 is applied when the connection member 3 is mounted between the branch portions 6 a and 6 b of the U-shaped plug 6, and the connection member 3 is handled. In addition, the connection member 3 can be handled by gripping the plug 6.

Thereby, it can prevent that the edge part of the connection member 3 and the edge part of the optical fiber 2 are contaminated by the contact of a hand or another component.
Further, when the connecting member 3 is attached to the adapter 1, the connecting member 3 is slid and attached between the branch portions 6 a and 6 b of the plug 6, thereby connecting the connecting member from the tip of the plug 6 as shown in FIG. 6. By positioning the end of 3 on the inside and butting together with the other plug 6 in this state, it is possible to accurately align the two connecting members 3 with respect to the adapter 1, and further, between the connecting members Is less likely to come into contact and break.

7 and 8 show an optical connection structure according to the third embodiment of the present invention.
In this embodiment, the connection fixing member 4 described above is improved.
Normally, the connection fixing member 4 is appropriately selected and used depending on the connection member type, optical fiber type, and installation environment. Particularly, since the shape of the connection fixing member is determined by the shape of the connection member and the shape of the adapter, it is not particularly limited. The material constituting the connection fixing member is not particularly limited as long as the connection member can be fixed to the adapter in the vertical direction, but various plastics, metals, and ceramics are preferably used. Furthermore, you may be comprised with several types of composite materials.

Therefore, when the connection fixing member 4 is attached to the adapter 1, for example, in order to avoid damage to the surface of the connection member, as shown in FIG. A metal can be used for the part engaged with the adapter using the part 7.
Further, as shown in FIG. 8, a leaf spring 8 biased downward may be mounted inside the connection fixing member 4 in order to press the connection member 3 against the adapter 1.

  In this way, when the connection fixing member 4 is made of metal, it can be satisfactorily attached to the adapter 1 with its own elastic force, and the connection member 3 provided inside can be protected, and the inside By virtue of the elastic force of the plastic material portion 7 provided on the connector 1, the connection member 3 can be satisfactorily pressed against the adapter 1 without being damaged.

9 and 10 show an optical connection structure according to the fourth embodiment of the present invention.
In this case, as shown in FIG. 9B, when the connection fixing member 4 is attached to the adapter 1, the connection fixing member 4 is large enough to form a slight gap with the connection member 3. Is formed. When the connection members 3 and 3 are mounted on the adapter 1 and the connection fixing member 4 is slid and attached to the adapter 1, the connection member 3 is perpendicular to the connection member 3 by the cam member 9 provided on the connection fixing member 4. It is fixed by applying a pressing force in the direction. Therefore, the connection fixing member 4 is slightly attached to the connection member 3 on the adapter 1 when the cam member 9 is rotatably attached to the space 9b provided in the upper portion and is attached to the adapter 1. When the gap is provided, the adapter 1 and the connection members 3 and 3 can be firmly assembled by rotating the cam member. For this reason, the connection fixing member 4 is preferably formed so that the inner dimension L is slightly larger as shown in FIG.

As shown in FIGS. 9 and 10, the cam member 9 may be a lever type that is attached to the connection fixing member 4 so as to be rotatable around the fulcrum portion 9a, but is not limited thereto. The shape may be selected appropriately in consideration of the shape of the connecting member, the shape of the plug, and the bag for housing the optical connection structure, and the shape is not particularly limited.
Further, as shown in FIG. 11, a spring portion 10 may be provided on the cam member 9. In FIG. 11, the spring portion 10 is integrally formed with the cam member 9. However, the spring portion 10 may be configured by mounting a separately processed spring material 10 on the cam member.

  According to this embodiment, the connecting member 3 is pressed and fixed onto the adapter 1 by the cam member 9 provided on the connecting fixing member 4, and the optical fiber 2 mounted on the connecting member 3 is abutted. Therefore, basically the same effect as that of the first embodiment described above can be obtained.

FIG. 12 shows an optical connection structure according to the fifth embodiment of the present invention.
In this case, the embodiment shown in FIG. 9 is applied. As shown in FIG. 12A, the rotating body 11 is rotatably attached to the connection fixing member 4 by a pin 11a. As shown in (b), the connecting member 3 is provided with a protrusion 12 that protrudes slightly upward.

  When the connection member 3 and the connection fixing member 4 are respectively attached to the adapter 1, the rotating body 11 of the connection fixing member 4 is brought into contact with the protrusion 12, so that the connection member 3 is directed downward with respect to the adapter 1. Thus, a vertical pressing force is generated, and basically the same effects as those of the above-described embodiment can be obtained.

FIG. 13 shows an optical connection structure according to the sixth embodiment of the present invention.
In this case, as shown in FIG. 13 (a), inside the connection fixing member 4, an abutting portion 13 directed downward is provided on the upper inner wall of the left end portion in the length direction, and mounted on the adapter 1. The left connection member 3 is provided with a notch 14.

  Then, as shown in FIG. 13 (a), when the two connecting members 3 are mounted on the adapter 1, as shown in FIG. 13 (b), the connecting members are brought into contact with each other. When the connection fixing member 4 is slid and attached to the adapter 1, the abutting portion 13 engages with the notch 14 of the left connection member 3, so that the left connection member 3 is moved to the right connection member 3 side. It is made to move and, thereby, the connection members 3 and 3 are faced | matched.

At this time, the adapter 1 is provided with a spring 5 as a pressing means so that a pressing force is applied to the connecting member 3 in the axial direction of the optical fiber 2, and the connecting members 3 are connected to each other by the elastic force of the spring 5 in the axial direction of the optical fiber 2. Also, the optical fibers 2 are optically connected to each other. Further, if the notches 14 are provided in all of the connecting members 3, the connecting components 3 can be mounted without regard to the left and right positions on the adapter 1, so that the connecting members are selectively provided according to the positions. There is no complication of having to.
Therefore, according to this embodiment, basically the same operational effects as those of the above-described embodiment can be obtained.

However, it is not limited to the connection fixing member 4 having the abutting portion 13. For example, as shown in FIG. 14, a pressing piece that engages with the notch 14 provided in the connection member 3 at one end portion of the grip portion 50. 51 is provided, and when the grip portion 50 is slid on the adapter 1, the pressing piece 51 engages with the notch 14, and the left connecting member 3 is abutted against the right connecting member 3 by its elastic force. The optical fibers may be optically connected to each other. That is, if the pressing piece 51 is configured as a pressing means for optically connecting the optical fibers in the axial direction, it is not necessary to provide the abutting portion 13 in the connection fixing member 4.
You may do it.

As the above-mentioned pressing means, any existing method may be used, and an elastic force such as a leaf spring, a spring, or a resin can be used.
Thus, when the optical fiber 2 is attached to the connecting member 3, the connecting members can apply a pressing force to the cross-sectional direction (radial direction) of the optical fiber by the pressing means. When sliding with respect to the optical fiber, the optical fiber is fixed to the plug or the optical fiber fixing member (not shown), and the tip of the optical fiber is fixed by applying a pressing force to the plug or the optical fiber fixing member. be able to.

15 and 16 show an optical connection structure according to the seventh embodiment of the present invention.
In FIG. 15A, a connecting member 3 connected via a plug 6 and a guide pin 16 is attached to the tip of the left optical fiber 2. This connection member 3 has an optical connection structure in which two pairs of optical fibers 2 are connected. Accordingly, as shown in FIG. 16, the guide pins 16 of the plug 6 are inserted through the inside of the connection member 3 at two locations, and both the connection members 3 have a pin through-hole through which the guide pin 16 is inserted, an optical A fiber through-hole through which the fiber 2 is inserted is provided.
As shown in FIG. 15 (a), the connection fixing member 4 is provided with a first abutting portion 17 at an upper portion of one end portion, and extends along the length direction at one end portion on the outer side thereof. A second abutting portion 18 is provided at the tip of the arm 4c.

The connection work of this embodiment is performed as follows.
First, the guide pins 16 of the plug 6 to which the optical fiber 2 is attached are inserted into the pin through-holes of the connection member 3 to form two sets of temporary assemblies of the optical fiber 2, the guide pin 16, and the connection member 3. Keep it. In that case, the optical fiber 2 is inserted into the fiber through-hole of each connection member 3 up to the middle position.
And these temporary assembly bodies are each mounted in the adapter 1, and both the connection members 3 are made to oppose (FIG. 15 (a)). Next, in FIG. 15A, the connection fixing member 4 is slid to the adapter 1 from the left side, and the first abutting portion 17 of the connection fixing member 4 is brought into contact with the left connection member 3 and remains in the contact state. When the connecting member 3 is moved so as to be pushed to the right connecting member 3 side, the optical fiber 2 inserted into the fiber through hole of the right connecting member 3 is moved through the fiber through hole of the right connecting member 3. It passes through and enters the fiber through hole of the left connection member 3 (FIG. 15B).
After that, when the connection fixing member 4 is further slid to the right side to bring the second abutting portion 18 into contact with the plug 6 as shown in FIG. Since the right connection member 3 is moved closer to the plug 6 attached to the right connection member 3 by the pressing force of the left connection member 3, the optical fiber 2 penetrating the right connection member 3 is connected to the left connection By being further inserted into the fiber through hole of the member 3, both optical fibers 2 are brought into contact with each other in the connection member 3 on the left side. That is, an optical connection structure is obtained in which both optical fibers are butted together in the left connection member 3 and the right connection member 6 is continuously pressed to the left side via the right adapter 6 by the elastic force of the spring 5. .

According to this embodiment, since the connection fixing member 3 is attached to the adapter 1, the opposing connection members 3 can be abutted with each other, and the optical fibers are axially connected to each other in the one connection member 3. Since they can be matched, basically the same operational effects as those of the above-described embodiment can be obtained.
Moreover, even if the connecting member 3 is connected to the tip of the optical fiber 2 via the plug 6 and the guide pin 16, the connecting member 3 can be reliably abutted by simply sliding the connecting member 3 on the adapter 1. Positioning can be performed, and optical connection can be performed satisfactorily.

However, the alignment of the connection members 3 and 3 is not limited to the above embodiment, and for example, as shown in FIG. 17, the inner wall surface of the adapter 1 and the connection fixing member 4 is brought into contact with the reference wall. Further, as shown in FIG. 18, a guide pin 16 or the like that functions as an alignment means may be mounted between the connecting members 3 and 3.

Further, as shown in FIG. 19, a semi-cylindrical protrusion 20 is provided in the adapter 1 along the length direction, and a groove 21 that engages with the protrusion 20 is provided in the connecting member 3, thereby forming a semi-cylindrical shape. The connecting member 3 may be mounted on the adapter 1 by placing the connecting member 3 along the protrusion 20.
By providing such alignment means, the connecting members can be reliably positioned, so that the connection work can be performed accurately.
In FIG. 19, an example in which the semi-cylindrical protrusion 20 as the alignment means is provided in the adapter 1 and the groove 21 is provided in the connection fixing member 4 is shown. Of course.

  The optical connection structure described above is a structure in which the optical fibers 2 are positioned with respect to each other by the connection member 3. However, the alignment of the optical fiber 2 is not limited to the above, for example, it is attached to the connection member 3. It is also possible to align with the other member and adapter 1 which were made. 20 to 22 show such a connection structure according to the eighth embodiment.

  That is, in the optical connection structure of this embodiment, as shown in FIGS. 20 to 22, the fiber introduction groove 22 that guides the optical fiber 2 is provided in the adapter 1, while the moving member 23 is provided at the distal end portion of the connection member 3. An insertion portion 24 for insertion is provided. The end of the connection member 3 is provided with a protrusion 3a that fits into the recess provided in the adapter 1. When the connection member 3 is mounted on the adapter 1, the protrusion 3a and the recess are engaged. Thus, the connecting member 3 is aligned with the adapter 1.

  Then, as shown in FIG. 21, when the connecting member 3 having the optical fiber 2 is mounted on the adapter 1, the moving member 23 is inserted into the insertion portion 24 of the connecting member 3, and in that state, FIG. As shown in FIG. 4, when the connection fixing member 4 is slid and attached to the adapter 1, the connection fixing member 4 presses the moving member 23 downward in the insertion portion 24, and the pressing force acts on the optical fiber 2. By doing so, the optical fiber 2 is pushed into the fiber introduction groove 22 in the adapter 1, whereby the optical fibers 2 of the connecting members 3 can be aligned with each other.

In this case, since the alignment of the optical fiber 2 is performed by the fiber introduction groove 22 provided in the adapter 1, the influence of the shape of the connection member 3 on the connection characteristics is small.
Therefore, even by using the moving member 23 that is movably provided in the insertion portion 24 of the connecting member 3, the optical fibers 2 can be satisfactorily aligned with each other. Similar effects can be obtained.

  As such a moving member 23, not only the said embodiment but the connection member 3 different from the connection member 3 can also be used, for example, as shown in FIG. FIG. 23 shows an optical connection structure according to the ninth embodiment of the present invention.

In the embodiment shown in FIG. 23, the left connecting member 3 having the optical fiber 2 and the right connecting member 3 having the optical fiber 2 are used. In this case, the right connecting member 3 is slightly different from the connecting member 3. It is the same that the optical fiber 2 is inserted through different shapes.
Then, when the connection member 3 and the connection member 3 are placed on the adapter 1, the moving member 26 is inserted between the connection members 3 and 3, and the connection fixing member 4 is slid in that state to thereby move the adapter 1. Is attached, the one moving member 26 between the connection members 3 and 3 pushes the optical fibers 2 downward.

According to this embodiment, one moving member 26 holds the two optical fibers 2 downward, and aligns the optical fibers within the fiber introduction groove 22 provided in the adapter 1. Can also be easily connected.
Therefore, as shown in FIG. 22, each of the optical fibers 2 facing each other may be fixed to the adapter 1 by an individual moving member 23, and fixed by one moving member 26 as shown in FIG. You can understand that.

  FIG. 23 shows an example in which the fiber introduction groove 22 is provided in the adapter 1. However, as shown in FIG. 24A, the moving member is opposite to the embodiment shown in FIGS. 22 and 23. 27 itself may be provided with a fiber introduction groove 28. When the moving member 27 is pressed by the connection fixing member 4 as shown in FIG. 24B, the two optical fibers 2 facing each other in the fiber introduction groove 28 of the moving member 27 can be aligned. it can.

As described above, as a means for moving the moving members 23, 26, 27 in the direction of the adapter 1, the connecting member 3 is fixed to the adapter 1 by the connection fixing member 4, and at the same time, the optical fiber 2 is fixed to the adapter 1 by the moving member. The method can be used.
Further, as a pressing means to the tip of the optical fiber, the tip of the optical fiber is brought into contact with each other by moving the connecting member 3 as described above, and then a spring, a resin, etc. A method using an elastic force can be used.
The material and shape of the moving member are not particularly limited as long as there is no fear of damaging the optical fiber, but plastic, metal, and rubber-based materials are preferably used. Further, a rubber structure may be used only for the contact portion with the optical fiber, and the other portion may be a composite structure made of plastic.

Further, as the moving member, a cam member can be used as shown in FIG. FIG. 25 shows an optical connection structure according to the tenth embodiment of the present invention.
That is, in the embodiment shown in FIG. 25, as shown in (a), a cam member 29 is rotatably attached to the connecting member 3, and the connecting member 3 having the cam member 29 is shown in (b). When the adapter 1 is placed on the adapter 1, the connection fixing member 4 is slid to the left on the adapter 1, and the connection fixing member 4 tilts the cam member 29 of the connection member 3. 2 is pushed into the adapter 1 side.

Thereafter, when the connection fixing member 4 is further moved to the left as shown in FIG. 25C, the abutting portion 30 provided at the end of the connection fixing member 4 comes into contact with the optical fiber fixing member 31, By moving the optical fiber fixing member 31 in the direction of the connecting member 3, the optical fiber 2 on the connecting member 3 side and the optical fiber 2 on the optical fiber fixing member 31 side can be brought into contact with each other. In this case, the end of the connection member 3 is provided with a protrusion 3a that fits into the recess provided in the adapter 1, and when the connection member 3 is mounted on the adapter 1, the protrusion 3a and the recess are fitted. By connecting, the connection member 3 does not move.
Therefore, the optical fibers 2 can be brought into contact with each other also by using a moving member made of the cam member 29.
However, the moving member is not limited to the cam member 29 and may be integrated with the connecting member 3.

  As described above, the optical fiber 2 is placed and fixed on the adapter 1 so that the optical fiber is aligned by the groove and the moving member without using the connecting member, so that the connecting member needs to be processed with high accuracy. And not. Further, since the opposing optical fibers are connected on one groove, the optical fibers can be stably connected. In addition, when mounting on the connecting member, a high degree of alignment accuracy is not required, and the process of mounting the optical fiber on the connecting member can be simplified.

26 to 29 show an optical connection structure according to the eleventh embodiment of the present invention.
In this case, first, as shown in FIG. 26, from the 8-core optical fiber ribbon (manufactured by Furukawa Electric), the optical fiber strand (125 μm diameter) is exposed by removing the coating near its end, Two of these are inserted, fixed, and polished into an MT-type connector 40 (manufactured by Hakusan Seisakusho, for single mode). In this embodiment, the 8-fiber optical fiber ribbon having the MT connector 40 is also illustrated as “optical fiber 1”.
A guide pin hole 41 is provided at the tip of one of the two MT connectors 40 as shown in FIG. A guide pin 42 to be inserted into the guide pin hole 41 is provided at the tip of the other MT connector 40 shown in FIG.

  Next, as shown in FIG. 27, the adapter 1 made of, for example, ABS resin is manufactured, and the MT connector 40 is mounted and mounted on the adapter 1 from above. At this time, the tip of the guide pin 42 protruding from the other MT connector 40 is inserted into the guide pin hole 41 of one MT connector 40.

  Then, as shown in FIG. 28, a connection fixing member 4 having a leaf spring 43 as a pressing means is prepared inside, and the connection fixing member 4 is slid over the adapter 1 to slide as shown in FIG. The MT connector 40 is fixed by pressing the adapter surface from above the adapter 1 with the leaf spring 43. Thereafter, using the stainless steel gripping part 50, the end portions of the MT-type connector 40 are sandwiched and pressed by the sandwiching pieces 52 on both sides of the gripping part 50, whereby the optical fibers 2 are brought into contact with each other, thereby optically Get the connection structure.

According to this embodiment, both MT connectors 40 are pressed against each other by the plate spring 43 of the connection fixing member 4 attached to the adapter 1 and pressed against the adapter 1 side. Since the connector 40 is sandwiched, the optical fibers can be aligned well and can be connected easily and reliably.
In addition, since the gripping portion 50 sandwiches the opposing connection members 3 along the axial direction of the optical fiber, the connection members 3 can be reliably abutted with each other, and the optical fibers 2 are also reliably abutted with each other and connected. The reliability as the optical connection structure can be increased.
Therefore, since the latch from the upper side does not act on the board to which the adapter 1 is attached without using the latch as in the conventional example, the board is not damaged. In addition, since no stress is constantly applied to the substrate, the substrate can be prevented from being deformed, and the substrate itself is not damaged.
In this embodiment, when the connection loss was measured at the connection point between the optical fibers, the average was 0.2 dB or less, and it was confirmed that the optical connection structure was sufficiently usable.

30 to 33 show an optical connection structure according to the twelfth embodiment of the present invention.
In this case, as shown in FIG. 30, one V-shaped fiber introduction groove 53 having a regular triangular cross section with a side of 0.21 mm, for example, is formed, and a regular triangular cross section with a side of 1.2 mm is formed. An ABS resin connecting member 3 (size: 5 mm × 84 mm × 3 mm) having two guide pin grooves 52 is produced.

On the other hand, although not shown in detail, the coating of the 250 μm diameter optical fiber core is removed from the end by 15 mm, the optical fiber (125 μm diameter) is cut at 10 mm from the coating end, and the connecting member 3 An optical fiber core wire protrudes 5 μm from the end of the connecting member into the fiber introduction groove 53 and is attached and fixed. The optical fiber core wire formed in this manner is referred to as “optical fiber 2” for convenience of explanation.
Next, as shown in FIGS. 31 (a) and 31 (b), as an alignment member, an adapter 1 made of ABS resin having two 0.7 mmφ stainless steel pins 54 fixed in parallel is prepared, and two connections are made. The member 3 was opposed and attached to the adapter 1 from above.

Thereafter, the connection fixing member 4 shown in FIG. 32 is prepared, and this is mounted on the adapter 1 and slid as shown in FIG. 33, and the connection member 3 is pressed against the adapter surface from above the adapter 1 by the connection fixing member 4. , The optical fiber 2 was pressed against the adapter plane, and the optical fiber cross section was aligned.
Thereafter, the end of the connection member 3 was pressed by the stainless gripping part 50, so that the optical fibers were brought into contact with each other to obtain an optical connection structure as illustrated.

According to the optical connection structure of this embodiment, the same excellent effects as those of the eleventh embodiment described above are produced. In this optical connection structure, the optical fiber 2 is fixed to the fiber introduction groove 53 of the connection member 3, so that the connection member 3 is connected to the adapter 1 by the pressing force applied to the connection member 3 and the adapter 1. Since the optical fiber 2 is fixed by being pressed onto the surface, the pressing force at the time of fixing the connecting member 3 can be applied to the positioning and fixing of the optical fiber 2, and the optical fiber 2 can be accurately attached to the connecting member 3. The step of fixing can be omitted.
Then, when the connection loss was measured at the connection point between the optical fibers 2, an average result of 0.2 dB or less was obtained, and it was confirmed that the optical connection structure could be used sufficiently.

34 to 39 show an optical connection structure according to the thirteenth embodiment of the invention.
In this case, as shown in FIG. 34, one V-shaped fiber introduction groove 58 having a cross section of an equilateral triangle with a side of 0.3 mm further has a through hole 59 for a moving member of 1 mm × 3 mm. A connecting member 3 made of ABS resin (size: 5 mm × 25 mm × 3 mm) was produced.

  Next, the optical fiber core wire is processed as described in the thirteenth embodiment, so that the optical fiber 2 is inserted into the fiber introduction groove 58 of the connection member 3 and the optical fiber 2 is attached to the connection member 3. . Next, as shown in FIG. 35, a moving member 60 to which a urethane foam 61 is attached is prepared, and this moving member 60 is inserted into the through hole 59 of the connecting member 3 through the urethane foam 61 as shown in FIG. To do. Next, as shown in FIG. 37, an adapter 1 made of ABS resin having a V-shaped fiber introduction groove 64 having a regular triangular cross section with a side of 0.21 mm is prepared, and the two connecting members 3 are attached to the adapter 1. Mounted relative to the top.

Thereafter, a connection fixing member 4 as shown in FIG. 38 is prepared. This is attached to the adapter 1 as shown in FIG. 39, and the moving member 60 attached to the connection member 3 is slid on the adapter 1. The optical fiber was aligned and fixed by pressing against the fiber introduction groove 64.
Next, a stainless steel gripping portion 50 is attached to the outer end portions of both connection members 3, and the optical fibers 2 are brought into contact with each other by being sandwiched between the gripping pieces 52 on both ends of the gripping portion 50 and pressed. A structure was obtained.

The optical connection structure according to this embodiment produces excellent effects similar to those of the eleventh and twelfth embodiments described above. Further, in this optical connection structure, the optical fiber 2 is directly aligned with the adapter 1 and fixed by the connection fixing member 4 through the moving member 60. Therefore, the connection fixing member 4 and the connection member 3 are aligned. High precision is not required, and high part machining precision is no longer required.
Moreover, when the connection loss was measured at the connection point of the optical fiber 2, the average was 0.2 dB or less, and it was confirmed that the optical connection structure can be sufficiently used.

FIG. 40 shows an optical connection structure according to the fourteenth embodiment of the present invention.
In this embodiment, a conical recess 66 is provided inside the connection fixing member 4 shown in FIG. 38, and a ball 67 made of stainless steel or the like is fitted into the recess 66, as shown in FIG. A connection fixing member 4 having a ball 67 is formed.
When the connection fixing member 4 formed in this manner is attached to the adapter 1 shown in FIG. 37, the ball 67 comes into contact with the moving member 60, and the moving member 60 is pressed in the direction of the adapter 1, thereby implementing the twelfth embodiment. An optical connection structure substantially the same as the form can be obtained.

According to the optical connection structure of this embodiment, the same excellent effects as those of the 11th to 13th embodiments were produced. Further, in this optical connection structure, since there is one contact point between the ball 67 and the connection fixing member 4, when a pressing force is applied by the ball 67, the pressing force is evenly applied to the lower pressing surface of the ball 67. Therefore, the optical fiber 2 can be aligned more completely.
And when connection loss was measured in the connection point of the optical fiber 2, it was 0.2bB or less on average, and it was confirmed that it can fully be used as an optical connection structure.

41 and 42 show an optical connection structure according to the fifteenth embodiment of the present invention.
In this case, the connection fixing member 4 as shown in FIG. 42 is formed by providing two open portions 69 on the upper surface of the connection fixing member 4 having the shape shown in FIG. A cam member 68 shown in FIG. 41 is attached to the open portion 69 of the fixing member 4 so as to be rotatable around a fulcrum portion 68a.

  In this way, the connection fixing member 4 having the cam member 68 is attached to the adapter 1 shown in FIG. 39, and the cam member 68 is tilted so that the cam member 68 contacts the moving member 60 and the moving member 60 is The optical connection structure was obtained by moving in one direction.

  According to the optical connection structure of this embodiment, the same excellent effects as those of the aforementioned 11th to 14th embodiments are produced. Further, in this optical connection structure, when the connection fixing member 4 is slid, it is not necessary to make contact with the connection member 3, and it is possible to smoothly slide without resistance.

According to this embodiment, since the cam member 68 can be brought into contact with the moving member after the connection fixing member 4 is slid, it is impossible to move the moving member simultaneously with the sliding. Pressure can be applied, and the optical fiber can be moved and fixed to the fiber introduction groove 64 more reliably.
Then, when the connection loss was measured at the connection point of the optical fiber 2, it was confirmed that the average was 0.2 dbB or less, and that it could be sufficiently used as an optical connection structure.

  In the optical connecting member of the above-described embodiment, the material and shape of the connecting member used are not particularly limited, and those made of zirconia, glass, plastic, ceramic, metal, etc. are preferably used. . The cross-sectional shape is preferably a circle or square. The optical fiber only needs to be attached to the connection member so that the optical fiber can be attached to the adapter. The optical fiber is attached to a through hole or a groove provided in the connection member, and the optical fiber is permanently fixed to the connection member with an adhesive. Alternatively, it may be mechanically gripped and replaceable.

  The optical fiber connection method is not limited in any way, and any existing optical fiber connection method can be used. Further, even if a refractive index matching agent is applied and connected between the optical fibers, the optical fibers can be connected to each other. PC (Physical Contact) connection may be performed by matching. The optical fiber used for the optical fiber connecting component of the present invention is appropriately selected and used according to the application purpose of the optical fiber connecting component. For example, a single mode optical fiber made of quartz or plastic, a multimode optical fiber, etc. Preferably used.

  On the other hand, when a refractive index matching agent is used, the material, form, and installation method are not particularly limited, and the material may be selected and used depending on the refractive index and material of the optical fiber. Silicone oil, silicone grease and the like are preferably used. The form of the refractive index matching agent may be liquid or solid, and may be, for example, oil, grease, gel, or film.

The optical fiber alignment means is appropriately selected and used depending on the type of connecting member, optical fiber type, and installation environment. The connecting member is provided with a through hole or groove, and the alignment member is provided in the through hole or groove. In the case of mounting and aligning, the alignment member is preferably a cylindrical or triangular columnar metal rod or plastic rod. When alignment is performed with reference to the external shape of the connecting member, a cylindrical, triangular, or square cylindrical glass tube, plastic tube, metal tube, or ceramic tube is preferably used. Furthermore, you may be comprised with several types of composite materials.
For example, a metal tube aligned and fixed to a plastic or glass member having a V-shaped groove may be used. In addition, since the alignment member can be slid along the connection member, the movement distance to the position where the connection member can be aligned can be shortened, and the alignment member and the optical connection structure itself Can be reduced in size.

It is explanatory drawing which shows the optical connection structure which concerns on 1st Embodiment of this invention. It is a perspective view which shows a connection fixing member. It is a figure which shows an example of the connection operation | work at the time of comprising the optical connection structure which concerns on 1st Embodiment in FIG. 1, Comprising: (a) is explanatory drawing which shows the state which mounted the connection member on the adapter, ( (b) is explanatory drawing which shows the state which mounted | wore the connection fixing member to the adapter of (a). FIG. 8 is a view showing another example of the connection work when the optical connection structure according to the first embodiment in FIG. 1 is constructed, and (a) shows a state where the connection fixing member is mounted on the adapter. Explanatory drawing, (b) is explanatory drawing which shows the state which mounted | wore the connection member on the adapter of (a), (c) moved the connection fixing member to the opposite side on the adapter, and mounted | worn another connection member Explanatory drawing which shows a state, (d) is explanatory drawing which shows the state which mounted | wore connection members with the connection fixing member to the adapter. It is a figure which shows the optical connection structure which concerns on 2nd Embodiment of this invention, Comprising: It is explanatory drawing which shows the state which mounted | wore the plug with the connection member. It is explanatory drawing which shows the state which accommodated the connection member in the plug. It is a figure which shows the optical connection structure concerning 3rd Embodiment of this invention, Comprising: It is a perspective view for description of the connection fixing member by which the plastic material was provided inside. It is a perspective view for explanation which shows the connection fixing member which similarly provided the leaf spring. It is a figure which shows the optical connection structure which concerns on 4th Embodiment of this invention, Comprising: (a) is side sectional drawing which shows a connection fixing member, (b) is a whole explanatory drawing of an optical connection structure. It is a perspective view which shows a cam member. It is a perspective view which shows the other example of a cam member. It is a figure which shows the optical connection structure which concerns on 5th Embodiment of this invention, Comprising: (a) is explanatory drawing which shows a connection fixing member, (b) is a whole explanatory drawing of an optical connection structure. It is explanatory drawing which shows the optical connection structure which concerns on 6th Embodiment of this invention. It is explanatory drawing which shows the modification of the optical connection structure in FIG. 13, Comprising: It is explanatory drawing which shows the state with which the holding part was mounted | worn with the adapter. It is a figure which shows the optical connection structure concerning 7th Embodiment of this invention, Comprising: (a) is explanatory drawing which shows the state with which the plug and the connection member were mounted on the adapter, (b) is connected on an adapter FIG. 5C is an explanatory view showing a state in which the fixing member is slid; FIG. 5C is an explanatory view showing a state in which the optical fibers are butted against each other in one connection member by the connection fixing member. It is sectional drawing for description which shows the state which mounted | wore the connection member and the connection fixing member with the adapter. It is explanatory drawing which shows the other example which comprises an optical connection structure. It is explanatory drawing which shows the state which mounted | wore with the guide pin as an alignment means between connection members. It is explanatory drawing which shows the state which connected the optical fiber by the semi-cylindrical protrusion as a positioning means. It is a figure which shows the optical connection structure which concerns on 8th Embodiment of this invention, Comprising: It is a perspective view of the principal part which shows the state which mounted the connection member which has an optical fiber in the adapter. It is explanatory drawing which shows the state which inserted the movement member in the connection member with which the adapter was mounted | worn. It is explanatory drawing which shows the state which mounted | wore the connection fixing member on the adapter in FIG. It is explanatory drawing which shows the optical connection structure which concerns on 9th Embodiment of this invention. It is explanatory drawing which provided the groove | channel for guiding an optical fiber to a moving member. It is a figure which shows the optical connection structure based on 10th Embodiment of this invention, Comprising: (a) is explanatory drawing of the state which mounted | wore the connection member with the optical fiber, (b) is an adapter for the connection member of (a). FIG. 6C is an explanatory diagram showing a state where the connection fixing member is mounted on the adapter by sliding the connection fixing member. It is a figure which shows the optical connection structure of 11th Embodiment of this invention, Comprising: It is explanatory drawing which shows the state by which the optical fiber was connected to MT type | mold connector. It is explanatory drawing which shows an adapter. It is explanatory drawing which shows a connection fixing member. It is explanatory drawing which shows a state when a holding part is mounted | worn with the adapter which has a connection member and a connection fixing member. It is a figure which shows the optical connection structure in 12th Embodiment of this invention, Comprising: It is a perspective view of a connection member. It is a figure which shows an adapter, Comprising: (a) is a front view, (b) is a perspective view. It is explanatory drawing which shows a connection fixing member. It is explanatory drawing which shows a state when a holding part is mounted | worn with the adapter which has a connection member and a connection fixing member. It is a figure which shows the optical connection structure which concerns on 13th Embodiment of this invention, Comprising: It is a perspective view of a connection member. It is a perspective view which shows a moving member. It is a perspective view which shows the state which attached the moving member to the connection member. It is explanatory drawing which shows an adapter. It is explanatory drawing which shows a connection fixing member. It is explanatory drawing which shows a state when the holding part is mounted | worn with the adapter which has a connection member which has a moving member, and a connection fixing member. It is a figure which shows the optical connection structure which concerns on 14th Embodiment of this invention, Comprising: It is explanatory drawing of the state which mounted | wore the connection fixing member. It is a figure which shows the optical connection structure which concerns on 15th Embodiment of this invention, Comprising: It is explanatory drawing of a cam member. It is explanatory drawing which shows the state which attached the cam member of FIG. 41 to the connection fixing member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Adapter 2 Optical fiber 3 Connection member 4 Connection fixing member 5 Leaf spring as a press means 6 Plug 9 Cam member 10 Rotating body 22, 28, 53, 58 Fiber introduction groove 23, 26, 60 Moving member 50 Grasping part

Claims (13)

A connecting member having at least one optical fiber mounted thereon is mounted on an upward-opening type adapter having an open top, and is attached to the adapter so as to be slidable in the axial direction of the optical fiber. An optical connection structure, wherein the connection component is pressed and fixed by a connection fixing member in a state where the optical fibers are abutted against each other. The optical connection structure according to claim 1,
An optical connection structure, wherein the connection member is attached to a plug. The optical connection structure according to claim 2,
The optical connection structure, wherein the connection member is slidable with respect to the plug. In the optical connection structure in any one of Claims 1-3,
An optical connection structure comprising pressing means for pressing the optical fiber in the axial direction of the optical fiber and abutting opposite ends of the optical fibers against each other. The optical connection structure according to claim 4,
The optical connection structure, wherein the pressing means is a spring. In the optical connection structure in any one of Claims 1-5,
An optical connection structure comprising optical fiber alignment means for abutting opposite ends of the optical fibers to each other. The optical connection structure according to claim 6, wherein
The optical fiber alignment means is characterized in that the connection fixing member slides in the axial direction of the optical fiber on the adapter and abuts the connection members. In the optical connection structure in any one of Claims 1-7,
When the connection fixing member slides on the adapter, the optical fiber is mutually connected to the optical fiber inserted through the other connection member in one of the two connection members facing each other. An optical connection structure characterized by being connected in abutment. In the optical connection structure in any one of Claims 6-8,
The optical fiber alignment means is constituted by a fiber introduction groove provided in the adapter and a moving member provided in the connecting member so as to be movable in the adapter direction. . In the optical connection structure in any one of Claims 6-8,
The optical fiber alignment means includes a moving member provided in the connecting member so as to be movable in the adapter direction, a fiber introduction groove provided in a lower portion of the moving member, and the adapter. An optical connection structure. The optical connection structure according to claim 1, wherein the connection fixing member or the connection member is provided with a pressing member that presses an optical fiber in the adapter direction. The optical connection structure according to claim 11,
The optical connection structure, wherein the pressing member is a rotatable cam member or a rotating body. In the optical connection structure in any one of Claims 1-12,
An optical connection structure comprising a grip portion for sandwiching the opposing connection members along the axial direction of the optical fiber.

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