JP2000009957A - Optical fiber connector and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical fiber connector which is inexpensive and has good optical connection accuracy. SOLUTION: The optical fiber connector 1 has a base part 2 which has optical fiber aligning grooves 8 to be inserted with optical fibers 3, 4 in order to butt and connect the end faces of the one optical fiber 3 and another optical fiber 4 to each other and a retaining member 5 which fixes the respective front ends of the optical fibers 3, 4 into these optical fiber aligning grooves 8 by pressing the respective butting ends of the optical fibers 3, 4 arranged in the optical fiber aligning grooves 8. The optical fiber aligning grooves 8 of the optical fiber connector 1 described above have slit-like apertures 13 which have a C shape in cross-section and consist of a width smaller than the diameter of the optical fibers 3, 4. The width of these apertures has the size to expose part of the peripheral surface of the optical fibers 3, 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber connector used for butt connection of optical fibers such as mechanical splices, and a method of manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, there is JP-A-9-197169 as a technique in such a field. The optical fiber connector described in this publication includes a base having a V-groove, a holding lid for holding and fixing an optical fiber in the V-groove, and a C-shaped spring arranged so as to surround the base and the holding lid. The mechanical splice is constructed in cooperation with. Therefore, a wedge-shaped opening member is inserted from the side between the base and the holding lid, and the C-shaped spring is forcibly expanded,
Insert the optical fiber core from both sides of the optical fiber connector,
Bring the tip of the optical fiber core wire to the joint position at the center of the base. Then, after abutting the distal end surfaces of the optical fiber core wires inserted from both sides, by pulling out the opening member, the C-shaped spring is closed, and the base and the holding lid are integrally held. The optical fiber connector having such a configuration achieves the fixed fixing of the optical fiber core wire.

[0003]

However, the conventional optical fiber connector has the following problems since it is configured as described above. That is, FIG.
When each optical fiber 102 is inserted into the V-shaped groove 101 of the base 100 as shown in FIG.
If the space between the optical fiber 102 and the presser lid (not shown) is excessively widened, the distal end portion 102a of the optical fiber 102 may come out of the V-shaped groove 101 or come off. Therefore, base 10
It is not possible to greatly expand the space between the cover 100 and the cover (not shown), and it is necessary to precisely open the base 100 and the cover by the opening member. As shown in FIG. 12, as a device for eliminating the floating of the tip portion 102a of the optical fiber 102, there is Japanese Patent Application Laid-Open No. 8-212245. However, at a position where optical connection is made, a sleeve is fixed as a separate component. The optical fiber is pressed down so that the pressing member enters the sleeve. However, in this case, it is necessary to precisely finish the pressing member and the sleeve which are formed as extremely small parts, which is disadvantageous in cost.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has as its object to provide an inexpensive optical fiber connector with high optical connection accuracy. It is another object of the present invention to manufacture such an optical fiber connector.

[0005]

According to a first aspect of the present invention, there is provided an optical fiber connector in which an optical fiber is inserted so that end faces of one optical fiber and the other optical fiber are connected to each other. An optical device comprising: a base component having a fiber alignment groove; and a pressing member for pressing an abutting portion of an optical fiber to be disposed in the optical fiber alignment groove and fixing each end portion of the optical fiber in the optical fiber alignment groove. In the fiber connector, the optical fiber alignment groove has a C-shaped cross section, and has a slit-shaped opening having a width smaller than the diameter of the optical fiber. It is characterized by having a size to expose the portion.

The optical fiber alignment groove provided in the base component of this optical fiber connector has a slit-shaped opening formed in a C-shaped cross section and having a width smaller than the diameter of the optical fiber. When the optical fiber is inserted into the fiber alignment groove, unlike the conventional mere V groove or C groove, the optical fiber does not come off from the optical fiber alignment groove. Therefore, the alignment of the optical fibers can be performed easily and reliably.

In the optical fiber connector according to the second aspect, the base component is provided with a funnel-shaped guide hole located at both ends of the optical fiber alignment groove, and the wall surface of the guide hole is formed as a convex curved surface. Is preferable. When such a configuration is adopted, the optical fiber can be easily and reliably inserted into the optical fiber alignment groove by using the funnel-shaped guide hole. Moreover, as a result of forming the wall surface of the guide hole as a convex curved surface, the optical fiber can be easily inserted so as to fit along the wall surface of the guide hole, without causing a sharp bend in the optical fiber. Thus, occurrence of local bending of the optical fiber is prevented.

In the optical fiber connector according to the third aspect, it is preferable that the base component is provided with an optical fiber introduction groove having a U-shaped cross section extending outward from the rear end of the guide hole. By using such an optical fiber introduction groove having a U-shaped cross section, the optical fiber can be easily inserted into the guide hole visually.

In the optical fiber connector according to the fourth aspect, the base component has a flat covering portion seating surface which extends outward from the rear end of the optical fiber introduction groove and mounts the covering portion of the optical fiber. It is preferable to be provided. When such a configuration is employed, the covering portion can be placed on the flat covering portion seating surface, which contributes to stabilization of the covering portion.

In the optical fiber connector according to the fifth aspect, the holding member has an optical fiber holding portion for holding the optical fiber in the optical fiber alignment groove and a coating holding portion for holding the coating portion on the coating portion seating surface. It is preferable. in this case,
By providing the optical fiber pressing portion and the coating pressing portion on the pressing member, the optical fiber and the coating portion can be simultaneously fixed to the base component.

According to a sixth aspect of the present invention, there is provided a method for manufacturing an optical fiber connector, comprising: an optical fiber alignment groove into which an optical fiber is inserted so that end faces of one optical fiber and the other optical fiber are connected to each other. And a base part having first and second guide holes extending outward from both ends of the optical fiber alignment groove, and a butt portion of an optical fiber arranged in the optical fiber alignment groove. An optical fiber connector comprising: a holding member for fixing each end portion of a fiber in an optical fiber alignment groove; a first molding pin extending in a pulling direction into a cavity of a mold when manufacturing a base component; The second shaping pin is arranged in a straight line facing the second shaping pin, and the tip of the first shaping pin is inserted into a fitting hole formed at the tip of the second shaping pin. A frusto-conical first guide hole forming portion for forming a first guide hole is provided in the middle of the shape pin, and a frusto-conical shape for forming a second guide hole is provided at the tip of the second forming pin. A second guide hole forming part having a shape is provided;
Between the first guide hole forming portion and the second guide hole forming portion, a part of the peripheral surface of the first forming pin is closed in the longitudinal direction by a cap provided on the mold, and the optical fiber It is characterized by forming an alignment groove.

In this method of manufacturing an optical fiber connector, when the base component is formed of resin or the like, the tip of the first forming pin disposed in the cavity is inserted into the fitting hole of the second forming pin. Then, a part of the peripheral surface of the first forming pin is closed in the longitudinal direction by the cap portion. As a result, when the mold is opened after the filler in the cavity is cured, the first molding pin and the second molding pin are retracted in the removing direction, so that the light having a slit-shaped opening on the surface of the base component is obtained. A fiber alignment groove will be formed. Further, since the first and second molding pins are provided with first and second truncated cone-shaped first and second guide hole molding portions, the base component has a funnel-shaped guide behind the optical fiber alignment groove. The holes will be integrally formed.

In the method for manufacturing an optical fiber connector according to the present invention, it is preferable that the peripheral surface of the first molding pin is closed by a cap portion by a half or less of its longitudinal section. When such a method is adopted, the optical fiber alignment groove of the base component created as a molded product has a cross section C
And has a slit-shaped opening having a width smaller than the diameter of the optical fiber, and the width of the opening is large enough to expose a part of the peripheral surface of the optical fiber. Become.

[0014] In the method for manufacturing an optical fiber connector according to claim 8, the peripheral surfaces of the first and second guide hole forming portions are:
Preferably, it is formed as a concave curved surface. When such a method is adopted, the wall surface of the guide hole of the base component created as a molded product is formed as a convex curved surface.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of an optical fiber connector and a method for manufacturing the same according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 is an exploded perspective view showing an optical fiber connector according to the present invention. Optical fiber connector 1 shown in FIG.
Is a base component 2 formed as an integrally molded component by injection molding, transfer molding, or the like using a filler-containing plastic material or the like, and a pair of optical fibers A and B inserted into the base component 2. It comprises a resin pressing member 5 for pressing the fibers 3 and 4 from above and fixing them to the base component 2, and a spring-like clamp member 6 having a U-shaped cross section for fixing the pressing member 5 to the base component 2. .

As shown in FIG. 1 and FIG.
A notch 7 is formed in the center of the notch, and four parallel optical fiber alignment grooves 8 are formed on the bottom surface 7a of the notch 7.
Are formed. Both ends of each optical fiber alignment groove 8 are opened, and four optical fibers 3 exposed by removing the covering portion 9 from the tip of the tape-shaped optical fiber core A from each open end. Each is inserted. Similarly, the four optical fibers 4 exposed by removing the coating 10 from the tip of the tape-shaped optical fiber core B are inserted into the respective open ends on the other side of the respective optical fiber alignment grooves 8. Is done.

Each of the optical fiber alignment grooves 8 is formed in a C-shaped cross section. The optical fiber alignment grooves 8 are formed continuously at both ends behind the optical fiber alignment grooves 8 and located at the entrance side of the optical fiber alignment grooves 8. Funnel-shaped first and second guide holes 11, 1
2 are provided. Each of the guide holes 11, 12 has a shape that gradually widens toward the entrance end 8a of the optical fiber alignment groove 8, and as shown in FIG. 3, the wall surfaces 11a, 12a of the guide holes 11, 12 are 20 mm or less. Is formed as a convex curved surface having a radius of curvature. When such funnel-shaped guide holes 11 and 12 are used, the optical fibers 3 and 4 can be easily and reliably inserted into the optical fiber alignment grooves 8. In addition, since the wall surfaces 11a and 12a of the guide holes 11 and 12 are formed as convex curved surfaces, the optical fibers 3 and 4 are connected to the wall surfaces 1 and 12 of the guide holes 11 and 12, respectively.
The optical fibers 3 and 4 can be easily inserted so as to be attached to the optical fibers 1a and 12a, and the optical fibers 3 and 4 can be prevented from being sharply bent and the local bending of the optical fibers 3 and 4 can be avoided.

As shown in FIGS. 4 and 5, the optical fiber alignment groove 8 has a slit-like opening 13 having a width W smaller than the diameter of the optical fibers 3 and 4.
Are cutouts 7 along the longitudinal direction of the optical fiber alignment groove 8.
Extend to the bottom surface 7a. Specifically, the optical fiber 3,
When the diameter of the optical fiber 4 is 125 μm,
Is suitably 90 to 110 μm. Also, the width W of the slit-shaped opening 13 is large enough to expose a part of the peripheral surface of the optical fibers 3 and 4, and it is preferable to project the head by about 30 μm from the bottom surface 7 a of the notch 7. Further, the diameter of the optical fiber alignment groove 8 is 2 times larger than the diameter of the optical fibers 3 and 4.
It is formed to be as large as μm. Therefore, the optical fibers 3, 4 are not deviated from the optical fiber alignment grooves 8 so that a part of the peripheral surface of the optical fibers 3, 4 can be viewed from the bottom surface 7 a of the cutout 7 in the optical fiber alignment grooves 8. The optical fibers 3 and 4 can be inserted.

Further, as shown in FIGS. 1 and 2, the base component 2 has an optical fiber extending outward from the rear ends of the guide holes 11 and 12 and having a U-shaped cross section. Introducing grooves 14 and 15 are provided. The optical fibers 3 and 4 are arranged along the walls of the optical fiber introduction grooves 14 and 15.
When the guide guide is used, the tips of the optical fibers 3 and 4 can be easily and visually inserted into the guide holes 14 and 15. The base component 2 has optical fibers 3 and 4 extending outward from the rear ends of the optical fiber introduction grooves 14 and 15.
Flat covering portion seating surface 1 on which the covering portions 9 and 10 are placed
6, 17 are provided. Each covering portion seating surface 16, 17
Extend in the same direction as the optical fiber introduction grooves 14 and 15 lowered by one step with respect to the optical fiber introduction grooves 14 and 15. This step differs depending on the thickness of the covering portions 9 and 10 of the tape-shaped optical fiber core wires A and B. When such flat covering portion seating surfaces 16 and 17 are employed, the covering portions 9 and 10 of the optical fibers 3 and 4 can be reliably arranged on the base component 2.

As shown in FIGS. 1 and 6, the holding member 5 made of a resin material is formed as an integrally molded part by injection molding, transfer molding, or the like, and has a main body part 20 extending in the longitudinal direction of the base part 2. An optical fiber pressing portion 21 protruding from the center of the main body portion 20 and fitted into the concave cutout 7 of the base component 2; Cover holding parts 22 and 23 that fit into provided auxiliary notches 24 and 25
And the coating pressing portions 22 and 23 are provided with the coating portion seating surfaces 16 and
17 is faced. Further, the width of the holding member 5 has at least the arrangement width of the four optical fiber alignment grooves 8, and the length of the holding member 5 is substantially equal to the length of the base component 2. Further, it is preferable that the holding member 5 is resin-molded so that at least the optical fiber holding portion 21 is transparent so that the optical connection point can be observed.

In the base part 2, the notch 7
A wedge insertion portion 29 having a stepped shape that cuts off the bottom surface 7a is formed on the side of the bottom surface 7a. Therefore,
By inserting the tip of the wedge member P into the wedge insertion portion 29, the pressing member 5 is lifted against the spring force of the clamp member 6.

In order to fix the optical fibers 3 and 4 to the optical fiber connector 1 in which the base component 2, the holding member 5 and the clamp member 6 have been assembled, first, the wedge member P is inserted into the wedge insertion portion 29. The tip is inserted, and the holding member 5 is in a state of being entirely lifted. Then, with the end faces of the four optical fibers 3 trimmed,
When the tip of the optical fiber 3 is inserted into each guide hole 11 along the wall surface of each optical fiber introduction groove 14, the tip of the optical fiber 3 becomes the wall surface 11 a of the guide hole 11.
And reaches the entrance at one end of the optical fiber alignment groove 8. When the optical fiber 3 is further pushed in, the tip of the optical fiber 3 reaches the center thereof while passing through the optical fiber alignment groove 8.

Similarly, in a state where the end faces of the four optical fibers 4 are trimmed, the optical fibers are introduced from the other end of the optical fiber alignment groove 8 using the optical fiber introduction grooves 15 and the guide holes 12. 4 is pushed in so that the distal end of the optical fiber 4 reaches the center of the optical fiber alignment groove 8 so that the distal end surface of the optical fiber 3 and the distal end surface of the optical fiber 4 face each other for optical connection. In addition, each of the covering portions 9 and 10 is connected to the covering portion seating surface 1.
6 and 17. At this time, it is preferable to fill the optical connection position of each optical fiber alignment groove 8 with a refractive index matching agent in advance.

In this state, when the wedge member P is pulled out,
Since the clamp member 6 made of a spring material and having a U-shaped cross section is assembled so as to sandwich the base component 2 and the pressing member 5, the pressing member 5 is pressed from above by the upper piece 6a.
As a result, as shown in FIG. 5, the peripheral surface portions of the optical fibers 3 and 4 exposed from the slit-shaped openings 13 of the optical fiber alignment groove 8 are pressed from above by the optical fiber pressing portions 21 of the pressing member 5. Will be done. Therefore, the optical fibers 3 and 4 can be easily fixed in the optical fiber alignment groove 8 without using an adhesive. Similarly, the clamp member 6
, The coating portions 9 and 10 are also fixed to the coating portion seating surfaces 16 and 17 of the base component 2.

Next, a method of manufacturing the base component 2 of the optical fiber connector 1 according to the present invention will be described.

As shown in FIGS. 7 and 8, the injection mold 30 is laterally inserted into an upper mold part 31, a lower mold part 32, and a cavity 33 formed by the cooperation of these parts. And first and second forming pins 34 and 35 as cores. Four first molding pins 34 are arranged side by side in the horizontal direction in order to create an optical fiber alignment groove 8 having a C-shaped cross section (see FIG. 5). On the other hand, the second molding pin 35 is arranged in a straight line in a state facing the first molding pin 34, and the tip of the first molding pin 34 is Of the first and second forming pins 34,
The reference numeral 35 is integrated to extend in the pulling-out direction.

In closing the mold 30, the first
The molding pin 34 and the second molding pin 35 move in a direction approaching each other (see FIG. 9), and finally, the first molding pin 34 and the second molding pin 35 are integrated, and the cavity is formed. In the center of 33, the C groove forming pin portions 34a of the first forming pins 34 are arranged in parallel. Each of the C-groove forming pin portions 34a has a diameter of 127 μm so that the optical fibers 3 and 4 having a diameter of 125 μm can be inserted. A first guide hole forming portion 34b having a truncated cone shape for forming the first guide hole 11 (see FIG. 3) is provided in the middle of the first forming pin 34.
Similarly, a second guide hole forming portion 35b having a truncated cone shape for forming the second guide hole 12 (see FIG. 3) is provided at the tip of the second forming pin 35.

As shown in FIG. 9, the peripheral surfaces of the first and second guide hole forming portions 34b, 35b are formed as concave curved surfaces 34bA, 35bA having a radius of curvature of about 20 mm. Behind the first and second guide hole forming portions 34b, 35b, cylindrical portions 34c, 35 having a diameter of about 0.25 mm are provided.
c are continuously formed. Then, the cylindrical portion 34c,
35c is juxtaposed with the front end faces of the rectangular parallelepiped bases 37, 38 having flat bottom surfaces 37a, 38a. Therefore, the four first molding pins 34 can be simultaneously inserted and removed from the cavity 33, and similarly, the four second molding pins 35 can be simultaneously extracted and inserted from the cavity 33. In order to improve the seating of the covering parts 9 and 10 (see FIG. 6), the bottom surfaces 37a and 38a are
It is lowered one step from the peripheral surfaces of 4c and 35c.

Here, as shown in FIG. 7 and FIG.
Guide hole forming portion 34b and second guide hole forming portion 35b
The upper surface of the peripheral surface of the C-groove forming pin portion 34a of the first forming pin 34 is connected to the four arc-shaped cap portions 3 provided on the cavity surface 31a of the upper mold portion 31.
6 closes in the longitudinal direction. This is because the optical fiber alignment groove 8 has a C-shaped cross section in the cavity 33 (see FIG. 5).
It is a device for molding.

Further, the upper surface of the peripheral surface of the C-groove forming pin portion 34a of the first forming pin 34 is closed by the cap portion 36 for less than half a circumference in a longitudinal section. As a result, in the base component 2, the optical fiber alignment groove 8 is formed into a C-shaped cross section, and has a slit-shaped opening 13 having a width smaller than the diameter of the optical fibers 3 and 4. Has a size that exposes a part of the peripheral surface of the optical fibers 3 and 4 (see FIG. 5). Note that half of the peripheral surfaces of the cylindrical portions 34c and 35c and the upper surfaces of the base portions 37 and 38 are joined to the mating surfaces 31b and 31 provided on the upper mold portion 31.
c.

Next, in molding the resin-made base part 2 by the above-described mold configuration, first, the tip of the first molding pin 34 is inserted into the fitting hole 3 of the second molding pin 35.
After being inserted into the mold 5a, the upper mold portion 31 and the lower mold portion 32 are closed, and a cavity 33 is formed in the mold 30. Then, a resin is injected into the cavity 33 and the resin is cured in the cavity 33. After that, the upper mold part 31 and the lower mold part 32 are opened, and the first molding pin 34 and the second molding pin 35 are retracted in the withdrawal direction (the direction of arrow C) apart from each other, and the cavity 33 is opened. The first and second molding pins 34 and 35 are extracted from the resin molded product created in the inside. As a result, a notch 7 is formed at the center of the base component 2 as a molded product, and auxiliary notches 24 and 25 are formed at both ends thereof. Further, the base component 2 has a desired diameter. The formed optical fiber alignment groove 8 having a C-shaped cross section, the guide holes 11 and 12, and the covering portion seating surfaces 16 and 17 are also formed.

The present invention is not limited to the above-described embodiment. For example, as shown in FIG. 11, in the holding member 40, the optical fiber holding portion 41 and the coating holding portion 4
2 and 43 are separate and independent.
42, 43 may be independently fixed by three clamp members 44, 45, 46, respectively. In the optical fiber connector of the present invention, the optical fiber alignment groove 8
May be one or more.

[0034]

Since the optical fiber connector according to the present invention is configured as described above, the following effects can be obtained.
That is, a base component having an optical fiber alignment groove into which an optical fiber is inserted, in order to abut and connect the end faces of one optical fiber and the other optical fiber, and an optical fiber arranged in the optical fiber alignment groove. A press member for pressing the butted portion to fix each end portion of the optical fiber in the optical fiber alignment groove, wherein the optical fiber alignment groove has a C-shaped cross section, The optical fiber has a slit-shaped opening having a width smaller than the diameter of the optical fiber, and the width of the opening is large enough to expose a part of the peripheral surface of the optical fiber, so that the optical fiber is inexpensive and has good optical connection accuracy. Enable connector.

In the method for manufacturing an optical fiber connector according to the present invention, in manufacturing the base part, the first forming pin and the second forming pin extending in the pulling direction are opposed to each other in the cavity of the mold. And the tip of the first forming pin is inserted into a fitting hole formed at the tip of the second forming pin, and a first guide hole is provided in the middle of the first forming pin. A first guide hole forming portion having a truncated cone shape to be formed is provided, and a second guide hole forming portion having a truncated cone shape to form a second guide hole is provided at a tip portion of the second forming pin. Between the first guide hole forming portion and the second guide hole forming portion, a part of the peripheral surface of the first forming pin is closed in a longitudinal direction by a cap portion provided on the mold, and light is emitted. Inexpensive optical connection accuracy by forming fiber alignment grooves It makes it possible to produce good optical fiber connector.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of an optical fiber connector according to the present invention.

FIG. 2 is a cross-sectional view of the base component of the optical fiber connector shown in FIG. 1, taken along the line II-II.

FIG. 3 is an enlarged sectional view of a guide hole of the base component shown in FIG. 2;

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 2;

FIG. 5 is an enlarged cross-sectional view of the optical fiber alignment groove shown in FIG.

FIG. 6 is a sectional view showing a state after the optical fiber connector shown in FIG. 1 is assembled.

FIG. 7 is a cross-sectional view showing a mold used in the method for manufacturing an optical fiber connector according to the present invention.

FIG. 8 is an enlarged sectional view of a main part of the mold shown in FIG.

FIG. 9 is a cross-sectional view showing first and second molding pins used as a core of a mold.

FIG. 10 is an enlarged sectional view of a main part of the mold shown in FIG.

FIG. 11 is a sectional view showing another embodiment of the optical fiber connector according to the present invention.

FIG. 12 is an enlarged perspective view of a main part of a conventional optical fiber connector.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Optical fiber connector, 2 ... Base component, 3, 4 ... Optical fiber, 5, 40 ... Holding member, 8 ... Optical fiber alignment groove,
11, 12 ... guide holes, 11a, 12a ... curved surfaces, 13
... Opening part, 14 ... Optical fiber introduction groove, 16 ... Coating part seating surface, 21,41 ... Optical fiber pressing part, 22,23,4
2, 43: coating presser, 30: mold, 33: cavity, 34: first forming pin, 34b: first guide hole forming part, 35: second forming pin, 35a: fitting hole, 3
5b: second guide hole forming portion, 36: cap portion, 34
bA, 35bA: curved surface, W: width of opening.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroshi Katsuyo 1st Tayacho, Sakae-ku, Yokohama-shi, Kanagawa Prefecture Sumitomo Electric Industries, Ltd. Yokohama Works (72) Inventor Toshiaki Kakii 1st Tayacho, Sakae-ku, Yokohama-shi, Kanagawa Sumitomo Electric Ki Kogyo Co., Ltd. Yokohama Works F-term (reference) 2H036 AA02 CA02 CA08 DA01 EA01

Claims (8)

[Claims] 1. A base component having an optical fiber alignment groove into which an optical fiber is inserted so that end faces of one optical fiber and the other optical fiber are butted together, and disposed in the optical fiber alignment groove. A holding member for holding down a butt portion of the optical fiber to be fixed and fixing each end portion of the optical fiber in the optical fiber alignment groove, wherein the optical fiber alignment groove has a cross section C. The optical fiber has a slit-shaped opening having a width smaller than the diameter of the optical fiber, and the width of the opening is large enough to expose a part of the peripheral surface of the optical fiber. Characteristic optical fiber connector. 2. The base component is provided with a funnel-shaped guide hole located at both ends of the optical fiber alignment groove,
The optical fiber connector according to claim 1, wherein a wall surface of the guide hole is formed as a convex curved surface. 3. The light according to claim 1, wherein the base component is provided with an optical fiber introduction groove having a U-shaped cross section extending outward from a rear end of the guide hole. Fiber splicer. 4. The base component is provided with a flat covering portion seating surface which extends outward from a rear end of the optical fiber introduction groove and mounts the covering portion of the optical fiber. The optical fiber connector according to claim 1, wherein 5. The holding member has an optical fiber holding portion for holding the optical fiber in the optical fiber alignment groove, and a coating holding portion for holding the coating portion on the coating portion seating surface. The optical fiber connector according to claim 4, wherein 6. An optical fiber alignment groove into which the optical fiber is inserted and extending outward from both ends of the optical fiber alignment groove so that the end faces of the one optical fiber and the other optical fiber are abutted and connected. A base part having first and second guide holes, and a butt portion of the optical fiber to be disposed in the optical fiber alignment groove, and pressing each end of the optical fiber into the optical fiber alignment groove. An optical fiber connector provided with a holding member fixed to the base member, in manufacturing the base component, a first forming pin and a second forming pin extending in a pulling direction are directly opposed to each other in a cavity of a mold. The tip of the first molding pin is inserted into a fitting hole formed at the tip of the second molding pin, and is located in the middle of the first molding pin. The first guide hole forming portion of frustoconical shape the serial first guide hole is provided,
A second guide hole forming portion having a truncated cone shape for forming the second guide hole is provided at the distal end portion of the second forming pin, and the first guide hole forming portion and the second guide hole forming portion are provided. The optical fiber alignment groove is formed by closing a part of the peripheral surface of the first forming pin in the longitudinal direction with a cap provided on the mold between the guide hole forming part and the cap. A method for manufacturing an optical fiber connector. 7. The method for manufacturing an optical fiber connector according to claim 6, wherein the peripheral surface of the first molding pin is closed by a half or less of the longitudinal section thereof by the cap portion. 8. The method of manufacturing an optical fiber connector according to claim 6, wherein the peripheral surfaces of the first and second guide hole forming portions are formed as concave curved surfaces.