JP4163204B2 - Optical connector - Google Patents

Description

  The present invention relates to an optical connector, and more particularly to an optical connector that can be assembled on site.

  In recent years, with the spread of FTTH (Fiber To The Home) and the like, optical communication networks have come to be widely used in ordinary homes. Along with this, an optical connector is assembled at the connection site by assembling an optical connector with no power supply and without polishing, and an optical fiber is connected. (For example, see Patent Documents 1 to 5)

7 to 9 show an example of this type of mechanical splice type optical connector.
As shown in FIG. 7, this mechanical splice type optical connector has a ferrule 20 in which a built-in optical fiber 21 is embedded in a front portion 11 and a coating layer of an optical fiber core wire to be connected to a rear portion 12. And a bare optical fiber on which the bare optical fiber (optical fiber) of the optical fiber is placed so as to connect the ferrule 20 and the coat layer groove 13 to each other. The connection base 10 in which the groove 14 is formed, the covering layer cover 31 covering the covering layer groove 13, the bare optical fiber cover 32 covering the bare optical fiber groove 14, and the covering layer cover 31. And a pressing member 40 that presses the optical fiber lid 32 against the connection base 10 side, and the covering layer groove 13 is wider and deeper than the bare optical fiber groove 14. One joint with lid 31 Or a connection part 50 (see FIG. 8) in which wedge insertion notches 15 and 33 are formed on one side of either one or both of the connection base 10 and the bare optical fiber lid 32; 8, a stop ring 60 that covers the pressing member 40 and is slidable with the pressing member 40, a spring 70 that is disposed inside the stop ring 60 and presses the connection part 50 forward with a predetermined force, and a collar portion 16, a plug frame 80 that covers 16, and a slider 90 (see FIG. 9) that is disposed outside the plug frame 80 so as to be slidable with the plug frame 80.

  The mechanical splice portion includes a coating layer groove 13 and a bare optical fiber groove 14 formed on the connection base 10, a lid 30, and a pressing member 40.

The pressing member 40 includes a bare optical fiber pressing member 42 that presses the bare optical fiber lid 32 against the connection substrate 10 side, and a coating layer pressing member 41 that presses the coating layer lid 31 against the connection substrate 10 side. Has been. The covering layer pressing member 41 and the bare optical fiber pressing member 42 are made of a plate-like member having a steel property such as a stainless steel material into a C-shaped section or a U-shaped section, and a part of the side surface thereof. Openings 41 ′ and 42 ′ are formed.
From the openings 41 ′ and 42 ′ of the coating layer pressing member 41 and the bare optical fiber pressing member 42, the coating layer lid 31 and the bare optical fiber lid 32 are connected to the coating layer groove 13 and the bare optical fiber groove 14. It is attached so that the mating surface of the connection base 10 and the lid 30 can be faced when it is put on. Further, as shown in FIG. 8, a wedge insertion slit formed by the notches 15 and 33 is formed on the lid 30 of the mating surface that can face and the side surface of the connection base 10, and the wedge insertion slit is formed in the wedge insertion slit. By inserting the insertion portion 101 of the wedge 100 against the pressing force of the pressing member 40, the interval between the joint surfaces of the connection base 10 and the lid 30 can be increased.

  The ferrule 20 has a built-in optical fiber 21 disposed therein, and one end 22 of the ferrule 20 is embedded in advance in a flange 16 portion of the connection board 10 at a factory or the like. The built-in optical fiber 21 exposed from the ferrule 20 is connected to the ferrule 20. It is placed on ten bare optical fiber grooves 14. Further, the end face of the built-in optical fiber 21 is mirror-polished together with the end face of the ferrule 20 at a factory or the like so that the other end of the ferrule 20 coincides with the end face.

  When the stop ring 60 is assembled, an opening 61 is formed on the side surface so that the openings 41 ′ and 42 ′ of the pressing member 40 can face from the side surface of the stop ring.

  In such an optical connector, the cover 30 is previously placed on the covering layer groove 13 and the bare optical fiber groove 14, and both the cover 30 and the connection base 10 are fixed to each other by the tightening force of the pressing member 40. The connecting part 50 in a state of being pressed by force is completed, the spring 70 is arranged on the small diameter portion on the rear end side of the connecting part 50, the plug frame 80 is put on the connecting part 50, and the stop ring 60 is placed in the plug frame 80. It is inserted and configured.

  As a result, as shown in FIG. 9, the engagement ring 62 formed on the outer periphery of the stop ring 60 is fitted into the engagement through hole 81 formed on the outer periphery of the plug frame 80, so that the stop ring 60 is connected to the inside. A structure integrated with the plug frame 80 in a state of including the parts 50 is configured. At this time, the opening 61 formed on the outer periphery of the stop ring 60 is coincident with the openings 41 ′ and 42 ′ of the pressing member 40 and the notches 15 and 33 formed on the mating surfaces of the connection base 10 and the lid 30. Assembled to do. The spring 70 is disposed in the stop ring 60 in a compressed state, and presses the connection part 50 forward (to the ferrule 20 side).

  To connect an optical fiber cord (cord) at the connection site using such an optical connector, after stripping the resin coating layer at the end of the optical fiber cord (cord) and exposing the bare optical fiber The bare optical fiber having a predetermined length whose end face is a mirror end face is exposed by the optical fiber cutter.

  Next, the insertion portion 101 of the wedge 100 is moved through the opening 61 of the stop ring and the opening portions 41 ′ and 42 ′ of the pressing member 40, which are assembled in advance as described above, against the pressing force of the pressing member 40 in the notches 15 and 33. Plug in. Thereby, the space | interval of the connection base 10 and the lid | cover 30 is extended by fixed length, and the space formed in the mating surface of the connection base 10 and the lid | cover 30 is expanded.

In this state, an optical fiber core (cord) in which the bare optical fiber is exposed for a certain length from the rear end side of the stop ring 60 is inserted along the coating layer groove 13 and the bare optical fiber groove 14 to bare the bare optical fiber. In the optical fiber groove 14, the resin coating layer is disposed on the coating layer groove 13, and the end face of the bare optical fiber and the end face of the built-in optical fiber 21 are brought into contact with the bare optical fiber groove 14. The wedge 100 is removed from the notches 15 and 33 (slits).
At this time, a colorless transparent and grease-like refractive index matching agent is arranged in advance on the end face of the bare optical fiber or the contact end face of the built-in optical fiber 21, and reflects light when the end faces of both optical fibers come into contact with each other. Optical connections are made in a reduced manner. Accordingly, the bare optical fiber placed on the bare optical fiber groove 14 is pressed and fixed and held on the bare optical fiber groove 14 by the lid 30, and the bare optical fiber and the built-in optical fiber 21 are Are optically connected on the bare optical fiber groove 14.
Next, the optical connector in which the slider 90 is covered from the plug frame 80 side and the built-in optical fiber 21 and the optical fiber core wire (cord) are optically connected is completed.

  In the optical connector configured as described above, the ferrule 20 is inserted into the split sleeve 112 from one end 111 of the connection adapter 110, and the other optical connector is inserted into the split sleeve 112 from the other end 113 side of the connection adapter 110. Alternatively, optical connection is made with other optical components arranged on the other end side. At this time, the engagement protrusion 114 formed in the connection adapter 110 is fitted into the engagement recess 82 formed on the outer periphery of the plug frame 80, and the optical connector is prevented from being detached from the connection adapter 110. Further, the fitting engagement is released by pulling the slider 90 away from the connection adapter 110, and the optical connector can be pulled out from the connection adapter 110.

  The above description uses the SC connector type component configuration and connection method as an example, but the present invention is not limited to the SC connector type and can be applied to other connector shapes and connection types.

JP-A-10-206688 JP-A-11-142686 JP-A-11-142687 JP-A-11-160563 JP 2000-347068 A

In an optical connector having a conventional structure, it is difficult to design when the diameter of the optical fiber core wire is increased to 0.5 mmφ or 0.9 mmφ, for example. The reason will be described below.
The optical fiber core wire has high strength in which the bare optical fiber is mainly composed of quartz glass, but the coating applied to the bare optical fiber has a certain degree of flexibility and stretchability. For this reason, in the mechanical splice type optical connector, in order to give the optical fiber coating fixing portion a certain gripping force, it is necessary to squeeze and grip the optical fiber coating in the coating layer groove by a certain amount or more. For example, in the conventional example, the covering strength with respect to the tensile force of the core portion is ensured by setting the covering crushing amount of about 10 to 15 μm in the covering grip on the 0.25 mmφ core wire.

  By the way, the thickness of the optical fiber coating increases as the optical fiber core diameter increases. When the diameter of the bare optical fiber is 125 μmφ, for example, the coating thickness in the case of a 0.25 mmφ core wire is 62.5 μm, whereas the 0.5 mmφ core wire is 187.5 μm, and the 0.9 mmφ core wire is 387. It reaches 5 μm. Along with this, the flexibility / stretchability of the optical fiber coating portion also becomes higher. That is, in order to obtain a gripping strength equivalent to that in the case of the 0.25 mmφ core wire, it is necessary to set a larger covering crushing amount for the 0.5 mmφ core wire and the 0.9 mmφ core wire. In addition, as the outer diameter of the covering portion increases, the outer diameter tolerance generally increases. However, in order to ensure the minimum gripping strength, the core wire having the smallest diameter allowed for the tolerance of the corresponding diameter is required. Even when used, it is desirable to have a design that ensures a minimum amount of covering.

  On the other hand, in order to ensure that an optical fiber is inserted into the optical fiber placement hole formed by the coating layer groove 13 and the coating layer lid 31 at the time of mechanical splicing, the optical fiber core wire of the corresponding diameter is the most in tolerance. An opening large enough to allow a large diameter to pass through without resistance is required. That is, as the optical fiber core wire diameter increases, the opening of the cover layer lid 31 in the mechanical splice portion must be set to be greatly increased.

  If the opening of the cover layer cover is enlarged for the above-mentioned reason, the bare optical fiber is not properly disposed in the bare optical fiber groove 14, thereby causing a problem that connection cannot be made. This will be described with reference to FIG. FIG. 10 illustrates the design of the cover 31 for the cover layer of the mechanical splice connector for a 0.25 mmφ core wire. When the outer diameter tolerance of the 0.25 mmφ core wire is ± 0.01 mm, it is necessary to secure a necessary covering crushing amount t (for example, 15 μm) for the minimum outer diameter of 0.24 mmφ (FIG. 10A). By closing the cover layer cover 31, the cover of the optical fiber core F is crushed at three points in contact with the bare optical fiber groove 14 and the cover layer cover 31 of the connection base 10 (FIG. 10B). As shown in FIGS. 10A and 10B, the depth of the coating layer groove 31 or the coating layer accommodation recess 35 is set so as to secure the amount of crushing when the tolerance is minimum, that is, to secure the gripping force of the coating portion of the optical fiber core wire. Must design.

  As described above, since the optical fiber core F must be inserted without resistance even when the tolerance is maximum, the opening is designed so that the 0.26 mmφ optical fiber core F can pass through (FIG. 10C). In practice, the size of the opening is adjusted by the depth of the wedge insertion slit formed in the connection base 10 or the cover layer lid 31. FIG. 10D shows a state in which the bare optical fiber f is inserted into the coating layer groove 13 designed by the procedure shown in FIGS. As can be seen, the 0.125 mmφ bare optical fiber f does not spill out of the coating layer groove 13.

  Next, a design for a 0.5 mmφ core wire will be described with reference to FIG. As in the case of 0.25 mmφ, the design is such that the cover crushing amount is secured in the case of the minimum tolerance diameter (FIGS. 11A and 11B).

In addition, since the outer diameter tolerance of the coating layer of the 0.5 mmφ core wire is assumed to be about ± 0.03 mm, it is necessary to have a sufficient gripping force even when the outer diameter is 0.47 mm. Further, since the thickness of the coating is increased as compared with 0.25 mmφ, a larger coating crushing amount t (for example, 30 μm) is necessary in order to have the same gripping force (FIG. 11A).
Subsequently, the opening is designed so that an optical fiber core F having a maximum coating diameter of 0.53 mmφ can pass through (FIG. 11C). Then, as shown in FIG. 11D, it can be seen that the bare optical fiber f is easily spilled from the coating layer groove 13.

  The bare optical fiber f removed from the coating layer groove 13 proceeds without resistance toward the wedge insertion side having a larger opening. Further, in the mechanical splice connector, since it is generally not possible to directly visually check the position of the end of the bare optical fiber f in the connector, the bare optical fiber f is out of the coating layer groove 13. It is difficult to recognize. For this reason, there is a problem that the wedge is removed while the bare optical fiber f is detached from the coating layer groove 13 and the assembly of the connector is likely to fail.

The optical connector of the present invention has been made in view of the above points. An optical fiber ferrule disposed at the front portion and embedded with a built-in optical fiber , and an optical fiber core wire disposed at the rear portion and connected thereto are connected. a coating layer groove for placing a covering layer of the optical fiber is inserted from the rear of the optical fiber inserting portion, to be connected to the covering layer groove between the optical fiber ferrule wherein the coating groove are arranged in a connecting base that bare optical fibers of the optical fiber is provided with a shallow bare optical fiber groove of said narrower than coating the groove and the depth to be placed for the connection, the covering layer A lid that covers the groove for use and the groove for the bare optical fiber;
An optical connector comprising: a pressing member that presses the lid against a connection board side; and a wedge insertion slit for inserting a wedge provided on one side surface of a joint surface between the connection board and the lid. Comprises a guide wall provided on the wedge insertion slit side of the coating groove , and the guide wall is provided along the coating groove from the optical fiber insertion portion of the coating groove, Projecting toward the lid side , and provided close to the covering groove so as to bring the bare optical fiber closer to the bare optical fiber groove as it approaches the bare optical fiber groove; A housing recess for housing the guide wall is provided at a position corresponding to the protruding guide wall.

  With the structure of the present invention, it is possible to reliably assemble a bare optical fiber without deviating from the bare optical fiber groove at the mechanical splice portion, for example, for a large diameter optical fiber of 0.5 mmφ or 0.9 mmφ. A mechanical splice connector can be provided.

  The present invention can employ the following various embodiments.

The coating groove is characterized in that the diameter of the optical fiber insertion portion is increased in a tapered shape, and the guide wall is formed outside the tapered coating groove at a distance from the tapered portion. Thereby, it is possible to easily insert the optical fiber core wire into the covering groove.

The groove for covering and the groove for bare optical fiber are connected with a groove width having a taper, and the angle of the taper surface is formed to be 30 degrees or less with respect to the central axis of the groove. . Thereby, the end of the bare optical fiber is reliably guided by the groove for the bare optical fiber.

The guide wall approaches the covering groove as it goes from the rear part to the front part. This makes it possible to reliably guide the bare optical fiber, which has been removed from the coating layer groove in the rear tapered portion, to the bare optical fiber groove.

The guide wall is characterized in that an angle of approaching the covering groove as it goes from the rear part to the front part is 30 degrees or less with respect to a central axis of the covering groove. This is because if the angle at which the guide wall converges is steep or has a step, the tip of the bare optical fiber is caught and normal guidance cannot be performed.

The guide wall has a height of 300 μm or more from an upper part of the covering groove. Thereby, it is possible to prevent the bare optical fiber from jumping out toward the wedge insertion slit.

In the assembled state of the connection substrate and the lid, the size of the gap formed between the guide wall and the storage recess is 100 μm or less in the height direction and 50 μm or less in the width direction. . Thereby, it is possible to reliably prevent the bare optical fiber from spilling and to smoothly open and close the lid.

An embodiment of the present invention will be described below with reference to FIG. 1, the same reference numerals as those shown in FIGS. 7 to 9 denote the same components as those shown in FIGS. 7 to 9, and the functions thereof are substantially the same. 1 is significantly different from FIGS. 7 to 9 in that the bare optical fiber escapes to the wedge insertion side of the coating layer groove 13 of the connection base 10 to the wedge insertion side, as shown in FIG. It is that the guide 17 for prevention is provided, and the hollow 34 which accommodates the said guide wall 17 is formed in the lower surface of the lid | cover 31 for coating layers (The shadow is given in FIG. (1)). portion).

  Further, in order to facilitate the insertion of the optical fiber core at the rear end side (optical fiber core wire insertion entrance side / optical fiber insertion portion) of the coating layer groove 13, in the direction from the rear end toward the center portion. A tapered taper 13 a is formed so that the optical fiber core wire can be easily guided to the coating layer groove 13. Further, the tip end side of the coating layer groove 13 (near the central portion of the connection base 10) is formed with two steps of tapered tapers 13b and 13c so as to communicate with the bare optical fiber groove 14 gradually. The tip of the optical fiber is easily guided to the bare optical fiber groove 14.

  The guide wall 17 is installed on the plane of the connection board 10 while avoiding the taper 13a, and has a shape that gradually approaches the bare optical fiber groove 14. Since the wedge is inserted from the lower side of the drawing in FIG. 1 (b), the gap generated between the connection base 10 and the cover layer lid 31 is wider at a position closer to the wedge, that is, in the lower side of the drawing. . For this reason, the guide wall 17 is installed without a gap in a region below the coating layer groove in the drawing to prevent the optical fiber from spilling from the mechanical splice.

  In addition, a coating layer housing recess 35 for housing the coating layer of the optical fiber core wire is formed on the lower surface of the coating layer lid 31 (the surface in contact with the connection base 10). Further, a tapered taper 35a is formed on the rear end side (optical fiber core insertion entrance side) of the coating layer housing recess 35 in a direction from the rear end toward the center, and further, a tapered taper 35b is formed on the front end side. Thus, the leading end of the bare optical fiber can be guided to the bare optical fiber groove 14 in combination with the taper 13a.

  It is desirable that the groove 34 for accommodating the guide wall has a minimum size that does not interfere with the guide wall 17 when the connection base 10 and the cover layer lid 31 are combined.

  This is because when the groove 34 for accommodating the guide wall is too large, a space through which the bare optical fiber can pass is formed between the guide wall 17 and the groove 34 for accommodating the guide wall. This is because the bare optical fiber cannot be guided. On the other hand, if the size of the groove 34 for accommodating the guide wall is narrow and the distance between the guide wall 17 and the groove 34 for accommodating the guide wall is too close, when the covering lid 31 is opened by inserting the wedge, This is because when the cover layer lid 31 is removed and the cover layer lid 31 is closed, the guide wall 17 and the cover layer lid 31 may interfere with each other at an undesired location and may not operate properly. The clearance between the guide wall 17 and the groove 34 that accommodates the guide wall is desirably about 50 μm in the horizontal direction and about 50 to 100 μm in the vertical direction. If the guide wall 17 is too low, the bare optical fiber easily wraps around the upper portion of the guide wall 17 when the cover layer lid 31 is opened. Therefore, it is desirable that the guide wall 17 has a certain height. For example, the height of the guide wall 17 is desirably 300 μm or more.

  By providing the guide wall 17 described above, even if the tip of the inserted optical fiber is detached from the coating layer groove 13, the tip of the bare optical fiber is bare light at the foremost position of the coating layer lid 31. It can guide so that it may come to the position near the groove | channel 14 for fibers. Furthermore, by providing a semiconical taper structure of an appropriate size at the rear part of the lid 32 for the bare optical fiber, the bare optical fiber that has advanced from the coating layer groove 13 to the bare optical fiber groove 14 can be obtained. It can be surely guided and dropped into the bare optical fiber groove 14. At this time, it is desirable that the size of the taper formed at the rear portion of the bare optical fiber lid 32 is sufficiently larger than the size of the tip of the coating layer groove 13.

  2A, 2B, and 2C are cross-sectional views at different positions in the longitudinal direction of the connection base 10 shown in FIG. In FIG. 2 (a), a guide wall 17 is formed at a position far from the coating layer groove 13 by avoiding the taper 13a at the rear part of the connection base 10, and as the bare optical fiber groove 14 is approached, FIG. As shown in FIG. 2 (c), the state of approaching the coating layer groove 13 step by step is shown. If the introduction taper portion and the guide wall are close to each other, there is a possibility that the optical fiber will wrap around the guide wall from the taper when the lid is opened, and the bare optical fiber f guides to the coating layer groove 13. Because it will not be done.

  The guide wall 17 approaches the cover layer groove 13 from the end of the connection board 10 to the tip side toward the center of the connection board 10, and at the most distal position of the installation range of the cover layer cover 31, It is desirable to be close to the rear end of the optical fiber groove 14 or close to a short distance such as 50 μm. Further, when the guide wall 17 is bent at a steep angle with respect to the longitudinal direction of the connection board 10 in the process in which the guide wall 17 approaches the center of the connection board 10, the tip of the bare optical fiber is caught and the guide is appropriately guided. Therefore, the angle formed between the guide wall 17 and the center line of the connection board 10 is preferably in a range not exceeding 30 degrees.

  FIG. 3 is a partial cross-sectional side view when the connection base 10, the cover layer cover 31, and the bare optical fiber cover 32 are covered with the cover layer pressing member 41 and the bare optical fiber press member 42 and assembled to the connection part 50. The figure is shown, and there is no difference in appearance from conventional connection parts.

Next, how the bare optical fiber inserted into the mechanical splice portion is guided to the bare optical fiber groove 14 will be described with reference to FIG.
FIG. 4 (a) shows a plan view of the connection base 10 in one embodiment of the present invention. FIGS. 4 (b) to 4 (e) show a covering layer in which a wedge is inserted into each mechanical splice portion. FIG. 5 shows cross sections at respective positions in FIG. 4A in a state where the lid 31 is opened. The bare optical fiber f has a diameter of 125 μm. 4 (b) is a cross-sectional view showing the relationship between the connection base and the cover layer cover 31 along the line AA in FIG. 4 (b), and the bare optical fiber f has a narrow gap on the right side in the figure. Although the layer groove 13 does not enter the outside, the wedge insertion side, which is the left side in the figure, can be easily moved to the outside by removing the cover layer groove 13, but the guide wall 17 and the cover layer cover It is blocked by 31 and does not go out of the connection board 10.

In order to clarify the movable range of the bare optical fiber f, the bare optical fiber f is shown on both the left and right sides in the figure, but one optical fiber core (cord) is inserted in the actual connector assembly. It is.
Furthermore, as it proceeds to FIG. 4 (c) (cross section taken along line BB in FIG. 4 (a)) and FIG. 4 (d) (cross section taken along line CC in FIG. 4 (a)), the guide wall 17 is moved. By approaching the coating layer groove 13, the movable range of the bare optical fiber f is reduced, and the bare optical fiber f is moved toward the bare optical fiber groove 14.

FIG. 4 (e) (DD cross section of FIG. 4 (a)) is a cross-sectional view immediately after entering the bare optical fiber lid 32. FIG. The taper 32a provided at the entrance of the bare optical fiber lid 32 is sized to cover the movable range of the bare optical fiber f at the tip position of the cover layer lid 31 (corresponding to the CC cross section). The bare optical fiber f introduced into the bare optical fiber lid 32 is always dropped into the bare optical fiber groove when the taper 32a provided in the bare optical fiber lid 32 is reduced.
With this configuration, the bare optical fiber f can be reliably guided to the bare optical fiber groove even with an optical fiber having a large diameter such as 0.5 mmφ.

  FIG. 5 shows another embodiment of the present invention, and the guide walls 17 are not limited to the wedge insertion side, and may be formed on both sides of the coating layer groove 13. Thereby, even if the space | interval of the connection base | substrate 10 and the cover layer lid | cover 31 opens widely, a bare optical fiber will not enter into the clearance gap on the opposite side to a wedge insertion side.

  FIG. 6 shows still another embodiment of the present invention, in which a two-stage structure is formed between a coating layer groove 13 and a bare optical fiber groove 14 formed in the connection board 10. It is a thing. The two-stage structure mentioned here is a structure in which a taper 13d that discontinuously expands is formed between these grooves, and the covering layer groove 13 is connected to the bare optical fiber groove 14 by the taper 13d. . Such a structure is desirable because it is easy to drop the bare optical fiber that has left the groove into the bare optical fiber groove 14 again at the boundary between the covering layer lid 31 and the bare optical fiber lid 32.

1 shows an embodiment of the present invention, in which A is a bottom view of the lid 20 and B is a plan view of the base 10. (A), (b), and (c) are cross-sectional views of the main part of FIG. It is a partial cross section side view which shows the assembly example of FIG. For explaining the operation of an embodiment of the present invention, A is a plan view of the base, B is a cut end view showing the relationship between the lid and the base at line AA in FIG. 4 (a) is a cut end view showing the relationship between the lid and the substrate along the line BB in FIG. 4 (a), d is a cut end view showing the relationship between the lid and the substrate along the line CC in FIG. FIG. 5 is a cut end view showing a relationship between the lid and the base in the DD line of FIG. It is a top view of the base | substrate in the other Example of this invention. It is a top view of the base | substrate in the further another Example of this invention. It is a principal part disassembled perspective view of an example of the past. It is a disassembled perspective view of the example which developed further conventionally. It is an assembly drawing in a conventional example. (A), (b), (c), (d) are explanatory diagrams for explaining the operation in the conventional example. (A), (b), (c), and (d) are explanatory diagrams for explaining the operation in different conventional examples.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Connection board | substrate 11 Front part 12 Rear part 13 Covering layer groove | channel 13a Taper 13b Taper 13c Taper 13d Taper 14 Bare optical fiber groove 15 Notch part 16 Guide wall 20 Ferrule 21 Built-in optical fiber 22 One end 30 Lid 31 Cover layer Cover 32 Bare optical fiber cover 32a Taper 33 Notch 34 Groove 35 for receiving guide wall Cover layer housing recess 35a Taper 35b Taper 40 Press member 41 Cover layer press member 41 'Opening 42 Optical fiber press member 42' Open Part 50 Connection part 60 Stop ring 61 Opening 62 Engagement protrusion 70 Spring 80 Plug frame 81 Engagement through hole 82 Engagement recess 90 Slider 100 Wedge 101 Insertion part 110 Connection adapter 111 One end 112 Split sleeve 113 Other end 114 Engagement protrusion F Optical fiber core wire f Bare optical fiber

Claims (7)

An optical fiber ferrule disposed at the front and embedded with the built-in optical fiber , and an optical fiber core wire disposed at the rear side and connected thereto are inserted from the rear optical fiber insertion portion to cover the optical fiber core wire. A covering layer groove on which a layer is placed, and a bare optical fiber of the connecting optical fiber core wire , arranged so as to be connected to the covering layer groove between the optical fiber ferrule and the covering groove, A connection board provided with a bare optical fiber groove that is narrower and shallower than the covering groove to be placed ; and
A lid that covers the covering layer groove and the bare optical fiber groove;
A pressing member that presses the lid against the connection base side;
A wedge insertion slit for inserting a wedge, provided on one side surface of the joint surface between the connection base and the lid;
An optical connector comprising:
The connection base includes a guide wall provided on the wedge insertion slit side of the covering groove , and the guide wall is provided along the covering groove from the optical fiber insertion portion of the covering groove. And is provided close to the covering groove so as to approach the bare optical fiber groove as it approaches the bare optical fiber groove, and protrudes toward the lid side .
The optical connector according to claim 1, wherein the lid includes a storage recess that stores the guide wall at a position corresponding to the protruding guide wall. 2. The coating groove according to claim 1, wherein the diameter of the optical fiber insertion portion is increased in a taper shape, and the guide wall is formed outside the taper-shaped coating groove at a distance from the taper portion. The optical connector according to 1. The groove for covering and the groove for bare optical fiber are connected with a groove width having a taper, and the angle of the taper surface is formed to be 30 degrees or less with respect to the central axis of the groove. The optical connector according to claim 1 or 2. 4. The optical connector according to claim 1, wherein the guide wall approaches the covering groove as it goes from the rear part to the front part. 5. 5. The optical connector according to claim 4, wherein an angle of the guide wall approaching the covering groove as it goes from the rear part to the front part is 30 degrees or less with respect to a central axis of the covering groove. 6. The optical connector according to claim 1, wherein a height of the guide wall is 300 μm or more from an upper part of the covering groove. In the assembled state of the connection substrate and the lid, the size of the gap formed between the guide wall and the storage recess is 100 μm or less in the height direction and 50 μm or less in the width direction. The optical connector according to claim 1.

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