JP3104908B2 - Optical connector plug - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method in which a plurality of cords are bundled together and, together with a reinforcing fiber,
The present invention relates to a connector plug for connecting a multi-core optical fiber cable covered with a synthetic resin sheath, and more particularly, to an optical connector having a guide groove for guiding an optical fiber core exposed from an end of the multi-core optical fiber cable. Regarding the plug.

[Prior Art] Communication transmission lines for covering a plurality of optical fiber cores collectively and transmitting high-density optical signals using one multi-core optical fiber cable have been developed in various fields. . An optical connector plug and a plug receiver for receiving the plug, such as a multi-core receptacle, for connecting multi-core optical fiber cables used for laying the communication transmission line and for connecting the multi-core optical fiber cable to the optical device. Is used. A multi-core optical fiber cable for the connector plug, in particular, an optical fiber core exposed from the jacket end of the fiber cable, a ferrule fixed to the tip,
Care must be taken not to cause a small bend between the outer cover of the multi-core optical fiber cable fixed to one end of the connector cover. That is, when a small bend occurs in the optical fiber core wire, the angle at which the light transmitted to the core portion of the optical fiber strand enters the interface with the clad portion may become larger than the critical angle. In that case, a part of the light energy is radiated into the cladding part and leaks. For this reason, light transmission loss increases. Therefore, it is important that this small bend does not occur.

[Problems to be Solved by the Invention] Conventionally, in the optical connector plug, no special consideration has been given to the optical fiber core wires accommodated in the upper and lower covers so as not to cause small bending.

By the way, the ferrule fixed to the tip of the optical fiber core generally adopts a floating structure supported by a coil spring. Therefore, when the ferrule is connected to a mating plug receiver, for example, a multi-core optical receptacle, the ferrule is pushed back in the optical connector plug against the spring force of the coil spring. As a result, the optical fiber core wire to which the ferrule is fixed is pressed backward. On the other hand, since the sheath of the optical fiber is fixed to one end of the upper and lower covers via the cable hood, the optical fiber core wire is bent in the upper and lower covers by pressing the ferrule backward. become. When the radius of curvature (bending radius) due to the bending becomes small, bending loss occurs, and there is a problem to be solved that causes transmission loss of an optical signal.

The ferrule fixed to the front end of each optical fiber is aligned with the front of the connector cover in the width direction and is extended and held forward, but the optical fiber is held at the rear in the connector cover. It is arranged so that it may spread radially from to the front. An optical connector having such a configuration is disclosed, for example, in Japanese Utility Model Application Laid-Open No. 54-154755. In this connector, a linear guide groove radially extending from the rear part of the cover toward the front ferrule is provided. A plurality of optical fiber cores are provided in each guide groove. When the guide groove is formed in a linear shape (a fan-shaped shape) that spreads radially in this manner, since all the ferrules are arranged and held in parallel toward the front, the optical fiber core wire at the base of the ferrule is held. Has an angle between the direction of the radially extending guide groove and the direction of the center axis of the ferrule (front-back direction). For this reason, the joint part with the optical fiber core wire at the root part of the ferrule is bent corresponding to this angle, and there is a problem that bending loss may occur at this part.

The angle formed between the radially extending guide groove and the axis of the ferrule, that is, the inclination angle of the guide groove with respect to the front-rear direction, is the largest for the outermost guide groove, and therefore the optical fiber core wire at the root of the outermost ferrule. Bending at the junction with the most likely to be the most problematic.

The present invention has been made in order to solve the above-described problems, and has an optical connector having a structure in which bending loss in the upper and lower covers of an optical fiber core is reduced as much as possible, and transmission loss of an optical signal is reduced. The purpose is to provide a plug.

[Means for Solving the Problems] In the optical connector plug of the present invention, a reinforcing fiber is peeled off at an end to expose and extend a plurality of optical fibers, and a ferrule is fixed to a tip of each of the optical fibers. An upper and lower cover is attached to an end of the optical fiber cable, and a portion of the end of the optical fiber cable covered with the reinforcing fiber is clamped and held by a rear portion of the upper and lower covers. A plurality of optical fiber core wires extending from the exposed portion are disposed in the upper and lower covers, and the ferrule is held side by side at the front of the upper and lower covers with the central axis thereof facing forward. And, on the inner surface of the upper and lower covers, a plurality of guide grooves are formed in a width direction from a portion for fixing the optical fiber cable in a rear portion to a portion for holding each ferrule in a front portion, and these plurality of guide grooves are formed. It is formed to have a curvature that protrudes outward in the width direction with respect to a center line extending in the front and rear directions of the upper and lower covers. Further, these guide grooves are formed so as to expand radially outward from the rear part of the upper and lower covers toward the front part in the width direction, and extend parallel to the front part at the front part to be connected to each ferrule. And
The radius of curvature of the plurality of guide grooves is set to be smallest in the guide groove located at the outermost side in the width direction.

For example, the radius of curvature of the guide groove located on the outermost side in the width direction is set to be 40 mm or more in the case of an optical fiber core wire whose core wire diameter is 0.6 mm (element wire diameter is 0.25 mm). preferable.

Note that the width of each guide groove is slightly larger than the diameter of the optical fiber core wire, and the depth of each guide groove is sufficiently larger than the diameter of the optical fiber core wire so that each of the optical fiber core wires has a corresponding guide. It is preferable to be able to move freely in the groove at least in the groove depth direction.

[Operation] According to the optical connector plug of the present invention, the plurality of guide grooves formed in the inner surface of the upper and lower covers in the width direction project outward in the width direction with respect to the center line extending in the front-rear direction of the upper and lower covers. The guide groove is formed to have a curvature such that the inclination angle of the guide groove extending obliquely from the rear part toward the width direction outward becomes gradually smaller as going forward, and extends substantially in the front-rear direction at the front part. (That is, so as to coincide with the central axis direction of the ferrule). Accordingly, at the joint between the ferrule and the optical fiber core, the optical fiber core can be disposed so that the optical fiber core extends straight straight rearward from the rear end (root part) of the ferrule. It becomes possible, and the optical fiber core wire is not bent at the joint portion with the ferrule.

If the plurality of guide grooves are formed so as to expand radially outward from the rear part of the upper and lower covers toward the front part in the width direction, it is possible to arrange all of the plurality of optical fiber cores without bending. Is possible. At this time, since the radially expanding angle of the guide groove located on the outermost side in the width direction is the largest, by minimizing the radius of curvature of this guide groove, any optical fiber core wire can bend at the joint with the ferrule. It can be reliably eliminated.

Further, if the optical fiber cores are allowed to move at least in the groove depth direction in the corresponding guide grooves, for example, even when the ferrule is pushed back when connecting with the optical receptacle, the optical fiber cores are not grooved. This can be absorbed by being bent in the depth direction, so that the optical fiber core does not bend with a small radius of curvature.

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

FIG. 1 is a perspective view in which a part of an optical connector plug according to the present invention and a multi-core optical receptacle as a plug receiver to be combined with the plug are partially inclined. FIG. FIG. In these figures, as shown in FIG. 2, the multi-core optical connector plug 1 is formed in the same shape, for example, an upper cover 2 and a lower cover 3 formed of an insulating resin. A ferrule housing 4 for accommodating each ferrule, a ferrule holding cover 6 for holding the ferrules 5 guided and supported by the ferrule housing 4 from behind, and as shown in FIG.
2 for fixing the reinforcing fiber 8 of the optical fiber cable 7
Pipes 9 and 10 for fixing reinforcing fibers having different diameters, and a cable hood 11 for supporting and fixing the jacket of the optical fiber cable 7.
And a total of seven members.

Next, these individual components will be described in detail.

First, the upper cover 2 and the lower cover 3 are configured as follows. That is, as shown in FIG. 3, a holder portion 14 whose both end surfaces facing each other are substantially parallel to each other, and a core wire guide portion 15 whose diameter is increased with a predetermined taper toward one end. ing. The holder part 14
In order to position the two reinforcing fiber fixing pipes 9 and 10 at predetermined positions, a concave portion 16 is formed to match the outer shape of the reinforcing fiber fixing pipe 10 located outside. I have. On both sides of the recess 16, through holes 17, 17 for inserting the small screw 12 shown in FIG. 2 are formed, and one peripheral edge of the through holes 17, 17 is relatively high. A tall cylindrical portion 17a is formed.

A counterbore portion 17b having a depth substantially equal to the height of the cylindrical portion 17a is formed on the periphery of the other through hole 17. When the upper cover 2 and the lower cover 3 are overlapped with each other, the cylindrical portion 17a of the upper cover 2
Of the lower cover 3, and conversely, the cylindrical portion 17a of the lower cover 3.
The upper and lower covers 2 and 3 are configured to fit in a counterbore portion 17b of the upper cover 2 and to be positioned at predetermined positions by so-called uneven fitting.

Recess for positioning reinforcing fiber fixing pipes 9, 10
A cable hood fitting recess 18 is formed adjacent to the 16 locking end 16a. Further, L-shaped grooves 20, 20 for accommodating rear ends of a pair of locking fittings 19, 19 shown in FIG. 2 for forming a locking mechanism are formed at substantially center both ends of the holder portion 14. I have.

Next, the configuration of the core wire guide portion 15 connected to the holder portion 14 will be described in detail.

In this core wire guide portion 15, a plurality of optical fiber core wires 21 separated from the holder portion 14, that is, in this embodiment,
A plurality of partition walls 22 are formed to individually separate the five optical fiber core wires 21 with a predetermined radius of curvature (also referred to as a minimum bending radius) and to guide them forward of the core wire guide portion 15.

The distance between the pair of adjacent partitions 22 and 22 is
1 is formed to be slightly larger than the outer diameter, so that the optical fiber core wire 21 can move in the width direction between the partition walls 21 and 21.
The radius of curvature of the outermost partition 22 is smaller than the radius of curvature of the partition 22 disposed on the inner side, but the radius of curvature of the outermost partition 22 is not less than a certain value. There are important points to note in production. That is, when an extremely small bent portion is formed in the optical fiber, an optical signal is attenuated due to so-called bending in such a portion, and a fatal defect of promoting transmission loss occurs. In this embodiment, as a result of various experiments, for example, an optical fiber core wire 21 having a wire diameter of 0.60 mmφ is used.
(Optical fiber diameter, 0.25 mmφ) The partition wall 22 is designed so that the radius of curvature does not become 40 mmφ or less at least.

Also, the height of the partition wall 22 is formed to be significantly higher than the wire diameter. For this reason, as shown in FIG.
When the upper cover 2 and the lower cover 3 are combined, the ends of the upper and lower partitions 22 abut each other to form a wide gap 23 partitioned by the partitions 22. Therefore, the optical fiber core wire 21 guided to the gap 23 can move right and left and up and down in the gap 23 when an external force is applied, but the left and right partitions 22 and 22 and the upper cover 2 and the lower cover 3 The range of motion is limited by the inner surface, and small bending is effectively prevented.

Next, at the tip of the optical fiber core 21 guided to the gap 23 formed by the partition walls 22 and 22, an optical fiber 24 positioned at the center of the optical fiber core 21 is precisely placed. A ferrule 5 for aligning the axes and fixing the optical fiber core 21 in a predetermined position is provided. Unlike the conventional fixing structure using an adhesive, the fixing structure to the ferrule is different from that of the synthetic resin ferrule 25 disposed outside as shown in FIGS. 5 (A) and 5 (B). And press-fit a metal reinforcing pipe 26
Then, an inner ferrule 27 made of synthetic resin is press-fitted and fixed. This fixing structure is a structure that is easy to manufacture and can easily and accurately position the optical fiber 24 at the center position of the ferrule.

Hereinafter, the ferrule fixing structure will be described in detail with reference to FIGS.

FIG. 5 (A) is a central longitudinal sectional view of an outermost outer ferrule 25 for inserting the optical fiber core 21 and the optical fiber 24. A tapered portion 28 is formed at the tip of the outer ferrule 25, and a flange 29 is formed at the rear end of the ferrule 25. The tapered portion 28 formed at the distal end is smoothly inserted into a mating plug receiver, for example, the multiple sleeve 201 in the multi-core optical receptacle 200 shown in FIG. 1, and serves as a guide. Things. On the other hand, as shown in FIG. 5 (A), an axially-facing groove 30 is formed in the rear end of the flange portion 29 by partially cutting out the outer peripheral facing portion of the flange portion 29. I have. These grooves 30, 30
As will be described in detail later, this is for preventing rotation in the circumferential direction relatively to the ferrule housing 4 shown in FIG. At the tip of the ferrule 25, a through hole 31 for inserting the optical fiber 24 formed by high-precision precision processing is formed at the center of the thick portion 32 at the tip in the axial direction. An enlarged diameter portion 31a is formed behind the through hole 31 and serves as a guide when the optical fiber 24 is inserted into the through hole 31.

An annular groove 33 is formed in the thick end portion 32 of the ferrule 25, and the outer diameter of the annular groove 33 and the inner diameter of the ferrule hollow portion 34 are formed so as to match. The ferrule hollow portion 34 has a reinforcing pipe 35 as shown in FIG.
Is press-fitted. The reinforcing pipe 35 is generally preferably a metal pipe, and in the case of the present embodiment, a stainless steel pipe whose inner and outer diameters are precisely finished is used. Therefore, when the above-mentioned reinforcing pipe 35 is press-fitted into the ferrule hollow portion 34 using a press-fitting tool (not shown) and the press-fitting is completed, the sixth pipe is formed.
As shown in the figure, the front end of the reinforcing pipe 35 is completely fitted into the annular groove 33 of the ferrule 25, and the rear end of the reinforcing pipe 35 projects rearward from the rear end of the flange 29 by a predetermined dimension. State. Projecting end 35a of this reinforcing pipe 35
Serves to regulate the position of a coil spring described later.

Next, details of the inner ferrule 27 inserted into the ferrule 25 will be described with reference to FIGS. 7 and 9. FIG.

In these figures, the inner ferrule 27 is, for example, formed in a substantially cylindrical shape with a synthetic resin, and two slits 27a are formed along the axial direction on the outer peripheral surface of the inner ferrule 27 at axially symmetric positions. Have been. The width of the slit 27a is formed to be different between the front end and the rear end. Further, the slit 27a is not formed over the entire longitudinal direction up to the distal end, and the slit 27a is not provided only at the distal end. Therefore, inner ferrule 2
7 can be expanded and the optical fiber 24 exposed from the optical fiber 21 shown in FIG.
Can be fixed inside the inner ferrule 27 with good workability. At the center of the inner ferrule 27, a hollow portion 27b in which the optical fiber core wire 21 is formed is formed, and a through hole accurately positioned at the axial center portion of the inner ferrule 27 so as to communicate with the hollow portion 27b. 27c is formed.
A guide portion 27d having a reduced diameter is formed at the distal end of the inner ferrule 27, and serves as a guide when the reinforcing ferrule 35 is press-fitted.

The optical fiber 21 from which the optical fiber 24 shown in FIG. 8B is exposed is pressed into the inner ferrule 27 from the rear end, and the optical fiber 24 and the optical fiber 21 are inserted. It is accurately positioned and fixed at the center in the inner ferrule 27. This state is shown in FIG.

Next, the assembly of the outer ferrule 25 into which the reinforcing pipe 35 is press-fitted is assembled integrally with the assembly of the inner ferrule 27 into which the optical fiber core 21 is press-fitted.

That is, the assembly of the inner ferrule 27 is press-fitted from behind the reinforcing pipe 35 of the assembly of the outer ferrule 25. In this case, the optical fiber 24 at the tip of the inner ferrule 25 is connected to the thicker portion 32 of the tip of the outer ferrule 25.
Guided by the enlarged diameter portion 31a formed in the through hole 31 at the center,
Smoothly inserted, and the center axis of the optical fiber 24 and the inner ferrule 27 and outer ferrule
The 25 central axes will exactly coincide with each other.

The assembled state of the ferrule fixing structure is well shown in the enlarged front view (A) of FIG. 5 (A) and the enlarged sectional view of FIG. 5 (B).

In FIG. 5, the optical fiber 24 protruding outside the outer ferrule 25 is cut and its end face is polished by a predetermined method. In the present embodiment, the outer ferrules 25 are fixed to the tips of the five optical fibers 21 in the same manner.

The outer ferrule 25 is positioned and fixed in the ferrule housing 4 shown in FIG. That is, details of the ferrule housing 4 are shown in FIG.
As shown in (B), (C) and (D), a ferrule guide hole 41 into which the outer ferrule 25 is inserted is formed in a substantially rectangular tube shape in the width direction.
Five are formed. Slightly forward of the ferrule guide hole 41, partition walls 42 are formed in the radial direction, respectively, as is well shown in FIG. 10 (D). The partition wall 41 is provided with through holes 43, respectively. The inner diameter of the through hole 43 is set to a size necessary and sufficient for the tip of the outer ferrule 25 to be inserted. Adjacent to the rear of the partition wall 41, and on the inner wall of the ferrule guide hole 41, in the circumferential direction, for example, every 180 °,
Small projections 44 are provided. As shown in the partially enlarged cross-sectional view of FIG.
The outer ferrule 25 is fitted into the symmetrical grooves 30, 30 formed in the flange portion 29 of the outer ferrule 25, and prevents the outer ferrule 25 from rotating in the circumferential direction. On the other hand, when the tip of the outer ferrule 25 is inserted into the through hole 43 formed in the partition wall 41,
The flange portion 29 of the outer ferrule 25 abuts on the partition wall 42, the length of the tip of the outer ferrule 25 projecting from each ferrule guide hole 41 is regulated, and the ferrule guide hole formed by the inner surface of each through hole 43. The five outer ferrules 25 are respectively positioned at the 41 axial center positions.

At both ends in the width direction of the ferrule housing 4, compartments 45, 45 are formed in parallel with the ferrule guide holes 41, into which the distal ends of the two locking fittings 19 shown in FIG. 2 are inserted. . Also, one outer surface 46 of the ferrule housing 4 is provided.
(See FIG. 10 (B)), two concave grooves 47, 47 are formed. These concave grooves 47, 47 are for regulating the directionality of the counterpart multi-core optical receptacle 200 or the like shown in FIG. 1 at the time of insertion. Furthermore, ferrule housing 4
On the rear end surface, four locking projections 49 are formed in two rows at regular intervals in the longitudinal direction. The locking projection 49 is for fixing the ferrule pressing cover 6 that closes the rear open end of the ferrule housing 4. That is, the twelfth
As shown in FIG. 13 and FIG. 13, a receiving hole 61 into which the locking projection 49 provided on the ferrule housing 4 is inserted is provided in the ferrule holding cover 6 at a position corresponding to the locking projection 49. It is provided in. However, the pitch of the receiving holes 61 is formed slightly smaller than the pitch of the locking projections 49. For this reason, when the locking projection 49 is inserted into the receiving hole 61, the locking projection 49 is forced to the position of the receiving hole 61.
That is, when the locking projection 49 is inserted in a state where it is slightly narrowed inward against the elasticity of the locking projection 49 and penetrates the receiving hole 61, the locking projection 49 is restored to its initial position by its own elasticity. When the hook portion 49a at the tip of the projection 49 presses the rear side 62 of the ferrule press cover 6, the press cover 6 completely closes the open end of the ferrule housing 4. On the other hand, on the front side 63 of the ferrule press cover 6,
Five spring holding portions 64 that fit into the ferrule guide holes 41 of the ferrule housing 4 are formed side by side and projecting. That is, the projecting spring holding portion 64 is fitted into the ferrule guide hole 41, and is provided for pressing one end of the coil spring 65, respectively. As a result, as shown in FIG.
However, when the coil spring 65 is locked to the ferrule housing 4 by the locking protrusion 49, the coil spring 65 is compressed in the ferrule guide hole 41, and as a result, the outer ferrule
25 is always supported in front of the ferrule guide hole 41 while urging it. As described above, the ferrule housing 4 supporting the outer ferrule 25 at a predetermined position is inserted and fixed inside the upper covers 2 and 3 shown in FIG. The fixing method is as follows. That is, the concave grooves 50, 50 are provided on the opposing outer surfaces 46, 46 behind the ferrule housing 4, respectively. An upper wall 50a is formed at the root end of each of the grooves 50, 50 so as to cover a part of the grooves 50, 50. On the other hand,
Small tongue pieces 15c, 15c are provided inside the lower covers 2, 3, that is, at the lip 15a of the core wire guide portion 15 of the upper and lower covers 2, 3 so as to protrude forward. A step 15b is formed in the lip 15a, and the ferrule housing 4 is positioned and fixed to the step 15b. First of all, the fixing method is
Small tongue pieces 15c, 15c provided at the rim 15a of the upper and lower covers 2, 3
Into the grooves 50, 50 of the ferrule housing 4.
That is, the small tongue pieces 15c, 15c are inserted into the bag holes (not shown) formed by the upper wall 50a from the openings. Next, the rear end of the ferrule housing 4 is dropped onto the step 15b, and is positioned and fixed. Then, an optical fiber core wire guided to the rear of the ferrule press cover 6 with respect to the ferrule housing 4.
21 is housed in a gap 23 having a predetermined radius of curvature formed by the partition walls 22 of the upper and lower covers 2 and 3, respectively. The reinforcing fiber 8 exposed from the end of the optical fiber cable 7 is fixed to the converging end of the gap 23.

Therefore, next, a method of fixing the jacket end portion of the optical fiber cable having the reinforcing fiber 8 will be described in detail.

First, as shown in FIG. 15, a concave portion 16 into which two short reinforcing fiber fixing pipes 9 and 10 are fitted is formed in the holder portions 14 (see FIG. 3) of the upper cover 2 and the lower cover 3. Have been. The reinforcing fiber fixing pipe 10 arranged outside is formed to be thinner than the reinforcing fiber fixing pipe arranged inside. Further, the material of the reinforcing fiber fixing pipe 10 may be any soft metal that can be easily deformed. In the embodiment of the present invention, brass is used.

The material of the reinforcing fiber fixing pipe 9 disposed inside and the material of the reinforcing fiber fixing pipe 10 disposed outside are changed.
That is, the same effect can be obtained by using a softer metal for the reinforcing fiber fixing pipe 10 on the outside than on the inside.

As described above, when the reinforcing fiber fixing pipe 10 is put on the outer side on the inner reinforcing fiber fixing pipe 9, an annular gap is formed between them, and the gap is formed in the gap from the end of the optical fiber cable 7. The exposed reinforcing fibers 8 are evenly sandwiched in the circumferential direction. More specifically, the inner reinforcing fiber fixing pipe 9 is inserted into the jacket 7a of the optical fiber cable 7 from the end. Next, the reinforcing fiber 8 is folded back around the inner periphery of the reinforcing fiber fixing pipe 9 so as to be wound from the end. Thereafter, the reinforcing fiber 8 is drawn to the inner surface, and the outer reinforcing fiber fixing pipe 10 is inserted. In this state, the recesses 16 formed in the upper cover 2 and the lower cover 3 are formed.
Then, the two pipes 9 and 10 are fitted. At the rear end of the recess 16 in the axial direction, a locking end 16a is formed as shown in FIGS. 2 and 3, and the inner and outer reinforcing fibers are fixed to the locking end 16a. One end face of the service pipes 9, 10, that is, the rear end face is regulated. The other end face, that is, the front end face of the reinforcing fiber fixing pipes 9 and 10 has a concave portion.
It is regulated by a front end portion 16b formed at 16. Thus, the reinforcing fiber fixing pipes 9 and 10 fitted in the concave portions 16 do not move in any of the axial directions of the optical fiber cable 7.

A cable hood 11 is disposed behind the reinforcing fiber fixing pipes 9 and 10. The cable hood 11 is formed of an elastic material, and is preferably made of, for example, polyurethane resin. As shown in FIG. 2, the cable hood 11 is formed with a tubular body 11b so as to protrude in the axial direction from one side surface of a flange-shaped main body 11a. Then, the optical fiber cable 7 is inserted through the cylindrical body 11 and the main body 11a. The cable hood 11 is fitted into a cable hood fitting concave portion 18 formed at the end of the upper and lower covers 2 and 3. This state is well shown in the enlarged view of FIG.

Note that the cable hood 11 is
Then, before inserting the reinforcing fiber fixing pipes 9 and 10, they are inserted.

Next, the order of assembling the multi-core optical connector plug 1 configured as described above will be described.

First, the ferrule housing 4 is fixed to the core wire guide portion 15 of the lower cover 3 as described above. Then
The optical fiber core 21 led out behind the ferrule press cover 6 of the ferrule housing 4 is connected to the adjacent partition walls 22 and 2.
Each is separately housed in the gap 23 formed by the two. The void 23 does not exist at the point where the optical fiber core 21 extends from the core guide part 15 to the holder part 14, and the converging part of the optical fiber core 21 is inserted into the inner reinforcing fiber fixing pipe 9. You. After the reinforcing fiber 8 exposed from the end of the optical fiber cable 7 is folded over the pipe 9 as described above, another reinforcing fiber fixing pipe 10 is put on the outside of the reinforcing fiber 8. . Next, together with the two reinforcing fiber fixing pipes 9 and 10, the cable hood 11 disposed adjacent to the rear of the pipes 9 and 10 is inserted into the recess 16 of the lower cover 3 and the cable hood fitting recess 18 respectively. Insert.

In this state, the lower cover 3 and the upper cover 2 formed in a symmetrical shape are overlapped. In this case, as described above, the cylindrical portion 17a and the counterbore portion 17b protruding from the inner surface of the holder portion 14 are fitted into the counterbore portion 17b formed on the upper cover 2 and the cylindrical portion 17a, respectively. The upper and lower covers 2, 3 are positioned.

Next, the small screw 12 is inserted into the through hole 17 provided at the center of the cylindrical portion 17a and the counterbore portion 17b, and the small screw 12 is fastened by being combined with the nut 13. Therefore, the relatively thin reinforcing fiber fixing pipe 10 disposed outside is deformed by the inner surface of the concave portion 16 of the upper and lower covers 2 and 3 so as to crush it. In this case, since the reinforcing fiber fixing pipe 9 disposed inside is formed to be relatively thick, it does not deform due to the pressing force, and eventually, the reinforcing fiber sandwiched between the gaps of the pipes 9 and 10. Will be firmly fixed. FIG. 17 shows a sectional view of this state.

In the above case, since the outer reinforcing fiber fixing pipe 10 is entirely deformed, a concentrated load like a spot is not applied to the optical fiber 24, and the risk of inadvertently damaging the fiber is effective. This has an extremely heavy effect that can be avoided. Further, conventionally, the reinforcing fiber fixing work, the attaching work to the cover and the like, and the two fixing work were required, but according to the above method, the fixing of the reinforcing fiber at the same time as the screwing of the upper and lower covers. It is possible to fix the optical fiber cable 7 by a so-called one stop work.
Work efficiency is improved.

On the other hand, the cable hood 11 is also pressed against the inner bottom surfaces of the cable hood fitting concave portions 18 of the upper and lower covers 2, 3, and is deformed so that the cable hood 11 formed by the elastic member is crushed. The jacket 7a of the optical fiber cable 7 inserted into the cable hood 11 is firmly held and fixed between the upper and lower covers 2, 3. Thus, the optical fiber cable 7 has the reinforcing fiber 8 inside, the reinforcing fiber fixing pipe 9,
In addition, since the jacket 7a is fixed by the cable hood 11, even if tension is applied to the optical fiber cable 7 rearward in the axial direction, the optical fiber core 21 and the Also, no excessive tension is applied to the optical fiber 24 inside the optical fiber 21 inside.

The multi-core optical connector plug 1 thus assembled
Are shown in FIGS. 14 (A) and (B).

Returning to FIG. 1 again, the configuration of a plug receiver, for example, a multi-core optical receptacle 100 to be combined with the multi-core optical connector plug 1 will be described with reference to FIG.

As well shown in FIG. 18 in which the top and bottom of each component are reversed, the multi-core optical receptacle 100 is, for example, a pair of a receptacle formed of a conductive resin in a substantially cylindrical shape.
110 and a multiple sleeve housed and fixed in the body 110
130 and the multiple sleeve 130 in the receptacle body 130
A light emitting element 140 inserted and arranged at the rear of the light emitting element 1
The sleeve holding plate 150 is disposed on the rear surface of the sleeve 40 and fixed to the multiple sleeve 130, and the rear cover fitting 170 is disposed on the rear surface of the sleeve pressing plate 150.

The receptacle main body 110 has an inner wall 111 extending in the width direction of the main body 110 therein as shown in FIG.
Is provided. The inner wall 111 has a plurality of through-holes 112 penetrating the inner wall 111, and five through holes 112 in this embodiment.
Are formed in a line. A corrugated step 113 is formed so as to surround the outer periphery of the through hole 111, and a tubular body 131 of a multiple sleeve 130 described later is fitted into the step 113.

Details of the multiple sleeve 131 are shown in FIGS. 24 to 26.

In these figures, the multiple sleeve 131 has a laser diode (LD), a light emitting diode (LED), etc.
Independent element accommodating portions 132 accommodating cap portions of the light emitting elements 140 (abbreviated as light emitting elements 140) are formed in series in the horizontal direction in the drawing. As shown in FIG. 24 (E), the element accommodating portion 132 and the cylindrical portion 113 are separated from each other by a partition 133.
At the center of the partition 133, a small-diameter through-hole 134 is formed to exactly face the center of the light emitting element 140, as is well shown in the enlarged rear view of FIG. 24 (F). ing.

In the element accommodating portion 132, ribs 135 protruding in the radial direction are provided at positions separated by 90 ° along the inner peripheral surface thereof.
The rib 135 is provided so as to absorb variations in the outer dimensions of the light emitting element 140 and securely fix the light emitting element 140 in the element accommodating section 132. That is, the dimensions are set such that the outer diameter of the cylindrical portion of the light emitting element 140 is slightly larger than the virtual circle passing through the apex of the rib 135 protruding in the radial direction. It has a structure to press-fit into 132. Further, a step portion 136 is formed at an opening end of the element accommodating portion 132, and a part of the step portion 136 for preventing rotation provided on the cap 141 of the light emitting element 140 (see FIG. 18). A notch 137 for inserting the small tongue piece 142 is formed.

When housing the light emitting element 140 in the element housing section 132,
By dropping the small tongue piece 142 of the light emitting element 132 into the notch 137, the directionality of the light emitting element 140 is regulated. As the light emitting element 140 housed in the element housing 132, in the case of this embodiment, an LED is used, and the lead 143 and the lead 144 thereof are bent at substantially right angles as shown in FIG. The lead 138 is inserted into the groove 138a of the lead receiving part 138 protruding from the end of the element accommodating part 132.

In addition, different types of light emitting elements 140 are inserted.
In the light emitting element 140 having the book leads, the lead portion located at the center is inserted into the shallow groove 138b formed at the center of the lead receiving portion 138, and the leads on both sides are relatively Is inserted into the groove 138a having a relatively large depth.

An element holding plate 150 shown in FIG. 25 is arranged on the back surface of the multiple sleeve 130.

The element holding plate 150 is an element accommodating portion of the multiple sleeve 130.
Fit into 132. That is, the light emitting element 140 accommodated in the element accommodating portion 132 is fixed to the partition 133 serving as the bottom surface of the element accommodating portion 132 without being displaced, and so that the light emitting surface of the light emitting element 140 is not inclined. For this purpose, it has the following precise structure.

That is, as shown in FIG. 25, small projections 151 are formed in a predetermined arrangement on the surface of the element holding plate 150 facing the element housing 132. The arrangement of the small projections 151 is determined by the
When the light emitting element 140 is accommodated in the housing 140, as shown in FIG. 26, the small projection 151 comes into contact with a flange 145 formed on the periphery of the cap of the element 140. As an arrangement. Further, as shown in FIG. 25 (B) or (D), a light emitting element
A narrow groove 152 for receiving the lead portion 140 is formed. The narrow grooves 152 are formed as a set of three light emitting elements 140 to be accommodated. In this embodiment, five light emitting elements 140 are used. Therefore, five sets of the narrow grooves 152 are formed in parallel in a horizontal row. Have been. Further, among the set of narrow grooves 152, the narrow grooves 152 at both ends are the same length, the narrow groove 153 at the center is shorter than the narrow grooves 152 at both ends, and the groove is formed relatively deep. I have.

Next, in FIG. 26, the element accommodating portion 132 of the multiple sleeve 130 is shown.
2 is an enlarged sectional view showing a state in which the light emitting element 140 is housed and fixed by the element pressing plate 150. As is clear from this figure, the cap of the light emitting element 140 housed in the element housing 132
The flange portion 145 of 141 is pressed and supported by the small projection 151 of the element holding plate 150. Also, the lead portions 143, 144 and the lead portion 143a located at the center of the light emitting element 140, which are led out from a mold portion (not shown), are bent at substantially right angles, and the depth of the lead receiving portion 138 on the multiple sleeve 130 side is relatively large. Are inserted respectively into the grooves 138a at both ends of which are deep and the groove 138b having a relatively small depth. On the other hand, the narrow grooves 152, 153 of the element holding plate 150 face the respective lead sections 143, 143a, 144 accommodated in the respective grooves 138a, 138b, and the respective lead sections 143, 143a are formed by the end faces of the narrow grooves 152, 153 in the grooves. , 144 is pressed. In this way, the respective lead portions 143, 143a, 144 are pressed in opposite directions by the end faces of the groove on the multiple sleeve 130 side and the groove on the element holding plate 150 side, and are securely fixed in the grooves. As a result, the five light emitting elements 140 are fixed to the element accommodating portion 132 at a time in combination with the holding by the small projections 151 on the element holding plate 150 side. That is, the light emitting surface of the light emitting element 140 set at a right angle to the optical axis of the other party can be structurally stably held.

Next, a method of fixing the multiple sleeve 130 and the element pressing plate 150 will be described with reference to FIGS. 24 to 25 again.

That is, as shown in the front view of FIG. 24 (B), in the multiple sleeve 130, four square grooves 139 are provided at opposing positions on the upper and lower sides of the element accommodating portion 132. It is formed between the body parts 131, 131, respectively. As shown in FIG. 25, upper and lower pairs of engaging arms 154,
Four sets of 154 are formed. Hook portions 154a are formed at the distal ends of the engagement arms 154, respectively.

Therefore, the connection between the multiple sleeve 130 and the element pressing plate 150 is performed by connecting the engagement arm 154 of the element pressing plate 150 to the multiple sleeve.
By pressing forward against 130 square grooves 139,
When the upper and lower engagement arms 154, 154 are pushed out against their own elasticity and the engagement arms 154, 154 are completely inserted into the square grooves 139, the hook portions 154a at the distal ends of the engagement arms 154, 154 are This is performed by restoring by elasticity and engaging with the step of the square groove 139.

Next, details of the rear cover fitting 170 which is arranged behind the element pressing plate 150 and is press-fitted and fixed in the receptacle main body 110 will be described with reference to FIGS. 22 and 23.

The rear cover fitting 170 is formed in a substantially U-shape in plan view, and has insertion pieces 172, 172 extending parallel to the open end. The two open ends have locking projections 17 facing each other.
1,171 are formed. The locking projections 171, 171 are, for example, locking fittings of the multi-core optical connector plug 1 shown in FIG.
The locking mechanisms 19 and 19 are fitted into the locking holes 19a and 19a to constitute a locking mechanism for both.

At the rear of the insertion pieces 172, 172 of the rear cover fitting 170, a pair of bending pieces 173, 173 are provided at opposing positions.
Two locking projections 174, 174 are formed on opposite end faces of 73, 173. Further, at the upper and lower end faces of the insertion pieces 172, 172 and at a position between the locking projection 171 and the bent piece 173, as shown in FIG.
175 are provided in upper and lower pairs, respectively. Mounting pieces 176, 176 for fixing to the printed circuit board 200 shown in FIG. 1 are formed on lower end surfaces of the insertion pieces 172, 172.

As shown in FIG. 18 and FIG. 19, the rear cover fitting 170 has square holes 11 formed at both ends in the width direction of the receptacle body 110 along the side walls 114, 114.
5,115 are respectively press-fitted. Then, as shown in FIG. 22, at the time of press-fitting, the locking projections 174, 174 bite into the side walls 116, 116 of the square holes 115, 115. Also, as shown in FIG. 23, locking projections 175, 175 bite into the protrusions 115a from above and below the square holes 115, 115. Thus, the rear cover bracket 1
70 bites into the receptacle main body 110 at a total of four places, and the two are completely connected, and the multiple sleeves 130 and the element pressing plate 150 on the inner surface thereof are firmly fixed to the receptacle main body 110.

Next, the assembling sequence of the entire multi-core optical receptacle 100 will be described with reference to FIGS. 27A to 27F.

27 (A) and 27 (B), the receptacle body 11
For 0, a multiple sleeve 130, five light emitting elements 140,
The element holding plate 150 and the rear cover fitting 170 are combined.

Therefore, first, five light emitting elements 140 are attached to the multiple sleeves 130 in the respective element accommodating portions 132 shown in FIG.
Then, predetermined positioning is performed via the cutout portion 137 to accommodate. Next, as shown in FIG. 27C, the element pressing plate 150 is fitted to the multiple sleeve 130 containing the light emitting element 140 from behind.

Then, as shown in FIG.27D, the receptacle body 110
, The multiple sleeve assembly is inserted. In this case, the cylindrical body 131 of the multiple sleeve 130 is inserted into the through-hole 1 of the receptacle body 110 shown in FIG. 18, FIG. 20, FIG.
The through-hole 112 and the cylindrical body 131 are formed so that accurate positioning is performed by inserting the through-hole 112 into the through-hole 12.

Next, as shown in FIG.27E, the rear cover bracket 170 is
It is inserted into the receptacle body 110. That is, the first
8 and FIG. 19 show the receptacle main body 1 well shown.
The rear cover fitting 170 is press-fitted into the ten square holes 115 using a predetermined tool or the like. The press-fitting of the rear cover fitting 170 causes the multiple sleeve assembly to move with respect to the receptacle body 110.
Reliable and firmly fixed. The completed multi-core optical receptacle 110 is shown in FIG. 27F. The optical receptacle 100 has the following features.

(1) The plurality of light emitting elements 140 are securely positioned and fixed to the element accommodating portion 132 of the multiple sleeve 130 by the sleeve pressing plate 150, and the light emitting elements 140 do not float. No transmission loss is caused.

(2) The light emitting element 140 having a small external shape is incorporated into the receptacle body 110 together with the light emitting element 140 together with the multiple sleeves 130.
It is not necessary to incorporate each of them into the receptacle body 110 one by one, so that the handling is convenient and the work efficiency is improved.

(3) A plurality of independent light sources can be very easily positioned on the same axis by the integrally formed multiple sleeve 130.

Next, with reference to FIGS. 28 and 29, an embodiment in which the receptacle body of the multi-core receptacle 100 is improved will be described.

FIG. 28 shows a conventional receptacle main body 120. The receptacle main body 120 is generally formed of a metal or a conductive resin 121 for noise suppression or the like. However, in this conventional structure, since the surface of the receptacle body 120 is conductive, for example, when mounted on the printed circuit board 200, a conductive pattern is provided on the surface 201 of the printed circuit board 200 that comes into contact with the surface of the receptacle body 120. Can not. In addition, an optical module whose case surface is conductive
When mounting 120 or the like on an electronic device, if it is necessary to insulate it from the housing of the electronic device, it is time-consuming to interpose another insulating member.

Therefore, as shown in FIG.
Has a structure in which the outside of the conductive resin 121 is covered with the insulating resin 122. By doing so, the surface 201 of the printed circuit board 200
Thus, the problem of short circuit with the conductive pattern can be avoided, and mounting on an electronic device becomes possible without the intervention of another insulating member, thereby reducing the number of components and achieving practical convenience.

As described above, in the above embodiment, the entire multi-fiber optical connector plug 1 and the whole multi-fiber optical receptacle 100 as a plug receiver of the multi-fiber optical connector plug 1 have been described in detail. In order to clarify the importance of the present invention, only the effects corresponding to the configuration of the claims of the present invention will be described as follows, particularly extracted.

[Effects of the Invention] According to the present invention, a guide groove for an optical fiber core is formed to have a curvature protruding outward in the width direction with respect to a center line extending in the front and rear directions of the upper and lower covers, and is formed from a rear portion. The outwardly inclined guide groove extending outward in the width direction gradually decreases as it advances forward, and the guide groove is formed at the front portion so as to extend substantially in the front-rear direction and coincide with the central axis direction of the ferrule. You. Thereby, it becomes possible to linearly extend from the joint portion between the ferrule and the optical fiber core wire toward the rear of the optical fiber core wire, and the optical fiber core wire is not bent at this joint portion. Transmission loss of an optical signal can be suppressed as much as possible.

Further, the plurality of guide grooves are formed so as to expand radially outward from the rear part of the upper and lower covers toward the front part in the width direction, and are disposed without bending all of the plurality of optical fiber cores. However, at this time, since the radially expanding angle of the guide groove located on the outermost side in the width direction is the largest, by minimizing the curvature of this guide groove, the ferrule can be formed for any optical fiber core. The bending at the joint with the wire can be surely eliminated.

Further, if the optical fiber cores are allowed to move at least in the groove depth direction in the corresponding guide grooves, for example, even when the ferrule is pushed back when connecting with the optical receptacle, the optical fiber cores are not grooved. This can be absorbed by being bent in the depth direction, and the optical fiber core does not bend.

[Brief description of the drawings]

FIG. 1 is a perspective view of a multi-fiber optical connector plug and a multi-fiber optical receptacle as a plug receiver according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of the multi-fiber optical connector plug. 3 shows an upper cover or a lower cover which is a component part of the multi-core optical connector plug. FIG. 3 (A) is a front view thereof, FIG. 3 (B) is a plan view showing an inner surface thereof, and FIG. C) is a plan view showing the outside thereof, FIG. 4 is an enlarged sectional view showing a gap formed by a combination of an upper cover and a lower cover, and FIG. 5 is a component part of the multi-core optical connector plug. FIG. 2A shows an enlarged front view, FIG. 2B shows a longitudinal sectional view of the ferrule, FIG. 6 shows components of the ferrule, and FIG. The longitudinal section of the outer ferrule, the same figure (B) is inserted in the outer ferrule Longitudinal sectional view of the reinforcing pipes, 7
FIG. 8 is a longitudinal sectional view showing a state in which a reinforcing pipe is press-fitted into the outer ferrule. FIG. 8 shows an inner ferrule and an optical fiber core wire press-fitted into the inner ferrule. (B) is a front view of the optical fiber with the optical fiber exposed from the end, (C) is a perspective view of the inner ferrule, and FIG. 9 is an inner ferrule. FIG. 10 shows a ferrule housing which is a component of the multi-core optical connector plug in a state where an optical fiber core wire is press-fitted in FIG. B) is a front view thereof, and (C) is a left side view thereof.
FIG. 11D is a cross-sectional view of the ferrule housing with a part cut away, and FIG.
An enlarged sectional view showing a state in which the ferrule is positioned,
FIG. 12 is a partial cross-sectional view for explaining the fixing structure of the ferrule to the ferrule housing, FIG. 13 is a partial cross-sectional view of the same, and FIG. 14 shows a multi-core optical connector plug incorporating each component, 15A is a front view of the same, FIG. 14B is a plan view of a part thereof, and FIG.
The figure is a perspective view for explaining the fixing structure of the reinforcing fiber in the optical fiber cable, FIG.
FIG. 17 is an enlarged sectional view showing the fixing structure to the lower cover, and FIG.
FIG. 18 is an exploded perspective view of the multi-core optical receptacle combined with the multi-core optical connector plug, FIG. 19 is a front view of the multi-core optical receptacle,
FIG. 20 is a sectional view taken along the line AA in FIG.
The figure is a sectional view taken along the line BB in FIG. 19, FIG. 22 and FIG.
FIG. 23 is also a cross-sectional view for clarifying the locking state of the rear cover fitting to the multi-core optical receptacle.
FIG. 22 is a cross-sectional view taken along line BB in FIG. 23, FIG. 23 is a cross-sectional view taken along line AA in FIG. 22, and FIG. 24 is a component part of the multi-core optical receptacle. (A) is a plan view, (B) is a front view, (C) is a side view, and (D) is a view (B) of FIG. ) Is a sectional view taken along the line AA, FIG. (E) is an enlarged sectional view taken along the line BB in FIG. (D), FIG. (F) is an enlarged rear view thereof, and FIG. ) Further shows a partially enlarged view of FIG. (F), and FIG. 25 shows a plate for holding a sleeve which is a component part of the multi-core optical receptacle, and FIG. FIG. 1B is a front view showing the inner surface, FIG. 2C is an enlarged sectional view taken along line AA in FIG.
FIG. 26 is a partial cross-sectional view for explaining a fixed state of the light emitting element to the multiple sleeve, FIG. 27A, FIG. 27B, FIG. 27C, FIG.
7D, 27E, and 27F are explanatory views showing an assembling sequence of the multi-core optical receptacle, FIG. 28 is a cross-sectional view of a case of a conventional optical module, and FIG. 29 is an improved optical module. It is sectional drawing of the case of a module. 1 ... multi-core optical connector plug, 2 ... upper cover, 3 ... lower cover, 4 ... ferrule housing, 5 ... ferrule, 6 ... ferrule holding cover, 7 ... optical fiber cable, 7a ... outer Coated, 8: Reinforcing fiber, 9,10: Reinforcing fiber fixing pipe, 11: Cable hood, 12: Small screw, 13: Nut, 14: Holder, 15: Core guide, 15a ... lip, 15b ... step, 15c ... small tongue, 16 ... recess, 16a ... locking end, 16b ... tip, 17 ... through-hole, 17a ... cylindrical part, 17b: Counterbore, 18: Cable hood fitting recess, 19: Locking bracket, 19a: Locking hole, 20: L-shaped groove, 21: Optical fiber core wire, 22: Partition wall , 23 ... void, 24 ... optical fiber, 25 ... outer ferrule, 26 ... reinforcement pipe, 27 ... inner ferrule, 27a ... slit, 27 b ... hollow part, 27c ... through hole, 27d ... guide part, 28 ... taper part, 29 ... flange part, 30 ... groove, 31 ... through hole, 32 ... thick end part, 33 …… annular groove, 34 …… ferrule hollow part, 35 …… reinforcement pipe, 41 …… ferrule guide hole, 42 …… partition wall, 43 …… through hole, 44 …… small protrusion, 45 …… compartment, 46 …… Outer surface, 47 …… Recessed groove, 48 …… Rear end surface, 49 …… Locking projection, 49a …… Hook part, 50 …… Recessed groove, 61 …… Receiving hole, 62 …… Back side, 63 …… Front side, 64: Spring holder, 65: Coil spring, 100: Multi-core optical receptacle, 110: Receptacle body, 111: Inner wall, 112: Through hole, 113: Step, 114 ... Side wall, 115 ... Square hole, 115a ... Projection, 116 ... Side wall, 120 ... Optical module, 121 ... Metal or conductive resin, 122 ... Insulating resin, 130 ... Multiple sleeve, 131 ... ... Cylinder, 132 ... Element 133, partition, 134, through hole, 135, rib, 136, step, 137, notch, 138, lead receiving portion, 138a, groove, 138b, shallow groove, 139 ... Square groove, 140 ... Light-emitting element, 141 ... Cap, 142 ... Small tongue piece, 143,144 ... Lead part, 145 ... Flange part, 150 ... Sleeve presser plate, 151 ... Small protrusion, 152 ... Narrow groove, 153: Narrow groove, 154: Engagement arm, 154a: Hook, 170: Rear cover bracket, 171: Locking projection, 172: Insertion piece, 173: Bend piece, 174, 175 ...... Locking projection, 176 Mounting piece, 200 Printed circuit board.

────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Toshihiro Nonaka 6-17-7 Nagayama, Tama-shi, Tokyo Kell Co., Ltd. (56) References Shikai Sho 54-154755 (JP, U) Shikai Sho 60-84910 (JP, U) Jpn. Sho 61-124004 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G02B 6/36-6/40

Claims (3)

(57) [Claims] 1. An optical fiber cable having a plurality of optical fiber cores exposed and extended at an end thereof and a ferrule fixed to a tip of each of the optical fiber cores. An optical connector plug configured by attaching a portion covered by the reinforcing fiber at the end of the optical fiber cable, and fixedly held by the rear portions of the upper and lower covers, and from the fixedly held portion The plurality of exposed optical fiber core wires are arranged in the upper and lower covers, and the ferrule is configured to be held side by side at the front part of the upper and lower covers with the center axis thereof facing forward, and On the inner surface of the upper and lower covers, a plurality of guide grooves from a portion for fixing the optical fiber cable at a rear portion to a portion for holding each ferrule are arranged in the width direction. The plurality of guide grooves are formed to have a curvature protruding outward in the width direction with respect to a center line extending in the front and rear directions of the upper and lower covers, and from a rear portion of the upper and lower covers toward a front portion. The ferrules are formed so as to radially expand outward in the width direction, are parallel to each other at the front portion, extend forward, and are coupled to the ferrules, and the curvature radii of the plurality of guide grooves are located at the outermost positions in the width direction. An optical connector plug, wherein the guide groove is set to be smallest. 2. A groove width of the guide groove is slightly larger than a diameter of the optical fiber core, a groove depth of the guide groove is sufficiently larger than a diameter of the optical fiber core, and the optical fiber core is 2. The optical connector plug according to claim 1, wherein the optical connector plugs are arranged so as to be freely movable in at least a groove depth direction in the corresponding guide grooves. 3. The radius of curvature of the outermost guide groove located in the width direction is 40 mm or more in the case of the optical fiber core wire having a core wire diameter of 0.6 mm (element wire diameter of 0.25 mm). The optical connector plug according to claim 1, wherein the optical connector plug is set to: