JPWO2018042795A1 - Optical connector manufacturing method - Google Patents

Abstract

The manufacturing method of the optical connector which concerns on one form is a manufacturing method of the optical connector which has a ferrule provided with the end surface which the optical fiber holding hole holding an optical fiber opens. This manufacturing method comprises the steps of: inserting the optical fiber into the optical fiber holding hole to expose the optical fiber at the end; bonding and fixing the optical fiber to the ferrule; processing the end and the optical fiber; Cutting the recess where the area where the fiber is exposed is more recessed than the other area at the end.

Description

One aspect of the present invention relates to a method of manufacturing an optical connector.
This application claims priority based on Japanese Patent Application No. 2016-172859 filed on Sep. 5, 2016, and incorporates all the contents described in the aforementioned Japanese application.

  Patent Document 1 describes an optical connector with a lens. The lensed optical connector includes an optical fiber and a ferrule having a holding hole for holding the optical fiber. The optical fiber and the ferrule are provided in a pair, and a light guide member is interposed between the pair of optical fibers. The light guide member includes a main body located between the pair of optical fibers and a spherical light guide lens disposed inside the main body.

JP 2003-255184 A

  A method of manufacturing an optical connector according to an embodiment of the present disclosure is a method of manufacturing an optical connector having a ferrule having an end face in which an optical fiber holding hole for holding an optical fiber is opened. Inserting the optical fiber to expose the optical fiber at the end of the ferrule, bonding and fixing the optical fiber to the ferrule, processing the end and the optical fiber, and at the end face, the area where the optical fiber is exposed Cutting a recess recessed below the region of

FIG. 1 is a perspective view showing an optical connector according to the first embodiment. FIG. 2 is a side sectional view for explaining the optical connection between the optical connector of FIG. 1 and another optical connector. FIG. 3A is a side view showing a method of manufacturing the optical connector of FIG. FIG. 3B is a side view showing the method of manufacturing the optical connector of FIG. 1; FIG. 4 is a perspective view showing an optical connector according to a second embodiment. FIG. 5A is a side view showing a method of manufacturing the optical connector of FIG. 4; FIG. 5B is a side view showing the method of manufacturing the optical connector of FIG. 4; FIG. 6A is a side view showing the method of manufacturing the optical connector according to the third embodiment. FIG. 6B is a plan view showing a grinding wheel used in the manufacturing method of FIG. 6A. FIG. 7A is a cross-sectional view showing a ferrule and an optical fiber according to a fourth embodiment. FIG. 7B is a cross-sectional view showing a ferrule and an optical fiber according to a modification. FIG. 8A is a side sectional view schematically showing a conventional optical connection structure. FIG. 8B is a side sectional view schematically showing a conventional optical connection structure.

[Problems to be solved by the present disclosure]
Generally as a system of connector connection of optical fibers, a PC (Physical Contact) system is known. FIG. 8A is a side sectional view showing an example of the structure of a PC type ferrule. The ferrule 100 has a hole 102 for holding the optical fiber 120. The optical fiber 120 is inserted into the hole 102. In this PC method, the optical fibers 120 are optically coupled by physically contacting and pressing the distal end surface of the optical fiber 120 with the distal end surface of the optical fiber 120 of the mating connector.

  However, the above method has the following problems. In the ferrule 100, the distal end surfaces of the two optical fibers 120 are physically brought into contact with and separated from each other to perform mounting and demounting. In addition, if foreign matter adheres to the end face 104 of the ferrule 100, the foreign matter adheres to the end face 104 due to the pressing force. It is necessary to use a contact type cleaner in order to remove the adhering foreign matter, and it is necessary to carry out frequent cleaning to prevent the adhesion of the foreign matter. Furthermore, in the case of a multi-core ferrule that simultaneously connects a plurality of optical fibers 120, a predetermined pressing force is required for each optical fiber 120, so a larger number of optical fibers 120 requires a larger force for connection. It becomes.

  For the above problem, for example, as shown in FIG. 8B, a structure is conceivable in which a spacer 106 is interposed between two end faces 104 to provide a gap between the tip faces 121 of the two optical fibers 120. However, in the structure in which the gap is provided between the tip end faces 121, the coupling state of light may change depending on the gap of the gap, and it is necessary to adjust the gap with high accuracy. Further, since the spacer 106 defines the distance, the thickness of the spacer 106 also needs to be designed with high accuracy. Furthermore, since the spacing is very small, it is required to make the thickness of the spacer 106 very thin. Therefore, it is difficult to handle the spacer 106 because it is difficult to design and manufacture the spacer 106 and the spacer 106 may come off.

  An object of the present disclosure is to provide a method of manufacturing an optical connector that can be easily designed and manufactured, and can manufacture an optical connector with good handleability.

[Effect of the present disclosure]
According to the present disclosure, an optical connector which can be easily designed and manufactured and which can be easily handled can be manufactured.

[Description of the embodiment]
First, the contents of the embodiment of the present disclosure will be listed and described. A method of manufacturing an optical connector according to an embodiment of the present invention is a method of manufacturing an optical connector having a ferrule having an end face in which an optical fiber holding hole for holding an optical fiber is opened. Inserting the optical fiber to expose the optical fiber at the end of the ferrule, bonding and fixing the optical fiber to the ferrule, processing the end and the optical fiber, and at the end face, the area where the optical fiber is exposed Cutting a recess recessed below the region of In the present disclosure, the “end surface” indicates one end of the processed ferrule, and the “end” indicates one end of the ferrule before or during processing.

  In the above-described method of manufacturing an optical connector, the concave portion in which the area where the optical fiber of the end face is exposed is recessed relative to the other area of the end is cut. Therefore, the area in the end face where the optical fiber is exposed is provided in the recess. Therefore, since the tip end surface of the optical fiber does not abut on the mating connector at the time of connection, wear of the tip end surface of the optical fiber does not occur even if the attachment and detachment are repeated. Further, since the area of the end face where the optical fiber is exposed is an area which does not physically contact, even if foreign matter enters this area, adhesion of the foreign matter can be avoided. Therefore, cleaning for removing foreign matter can be easily performed. Furthermore, the recess can be cut at the end, so that the spacer described above can be eliminated and a gap can be easily formed between the tip surfaces of the optical fibers. Since the spacer can be eliminated in this way, an optical connector which can be easily designed and manufactured and which can be easily handled can be manufactured.

  Also, in the step of grinding the recess, the end and the optical fiber may be milled by an end mill. In this case, the recess can be cut with high accuracy by milling the end using a minute end mill. Therefore, recesses of various shapes can be formed with high accuracy.

  In the step of grinding the recess, the end and the optical fiber may be ground by a grinding wheel. In this case, various recesses can be formed by using grinding wheels of various shapes and sizes.

  Further, in the step of grinding the recess, the end and the optical fiber may be polished with an abrasive. Thus, it is also possible to form a recessed part using an abrasives.

  In the step of cutting the recess, an inclined surface may be formed between the area where the optical fiber is exposed and the other area, with respect to the area where the optical fiber is exposed and the other area. In this case, the area where the optical fiber is exposed and the other area are smoothly connected by the inclined surface. Therefore, it is possible to make it difficult for foreign matter to enter into the recess, and to facilitate cleaning.

Details of Embodiment
Below, the specific example of the manufacturing method of the optical connector which concerns on embodiment is demonstrated, referring drawings. In addition, this invention is not limited to the illustration described below, It is shown by the claim and it is intended that all the changes within the range of a claim and equality are included. Hereinafter, in the description of the drawings, the same or corresponding elements will be denoted by the same reference symbols, without redundant description.

First Embodiment
FIG. 1 is a perspective view showing the optical connector 1 according to the first embodiment. FIG. 2 is a longitudinal sectional view showing an example of the optical connection between the optical connector 1 and the mating connector 20. As shown in FIG. As shown in FIGS. 1 and 2, the optical connector 1 includes a ferrule 2 and an optical fiber 3. The ferrule 2 has a rectangular parallelepiped appearance. The ferrule 2 is made of, for example, a resin such as polyphenylene sulfide (PPS) containing glass particles.

  The ferrule 2 is connected to the mating connector 20 in the connection direction A1. The ferrule 2 is provided at one end side in the connection direction A1 and is opposed to the mating connector 20. The ferrule 2 is provided with a rear end face provided at the other end side in the connection direction A1 and a pair extending along the connection direction A1. It has a side surface 2 b, a bottom surface and a top surface 2 c.

  The end 2a has a region R1 to which the optical fiber 3 is exposed and another region R2. The region R1 is formed, for example, in a horizontally long rectangular shape at the end 2a, and the four corners of the region R1 are rounded. Moreover, area | region R2 which protrudes with respect to the recessed part 2g is formed in the frame shape surrounding the recessed part 2g. Another region R2 indicates a region other than the region R1 at the end 2a, and is provided outside the region R1. The region R1 in the cut end surface forms a recess 2g which is recessed inward from the other regions R2.

  The end portion 2a is formed with a pair of guide holes 2e into which guide pins for positioning the optical connector 1 and the mating connector 20 are inserted. The pair of guide holes 2e is disposed along the direction A2 intersecting the connecting direction A1. The direction A2 is, for example, a direction orthogonal to the connection direction A1, and is a longitudinal direction of the end 2a and a direction parallel to the end 2a and the upper surface 2c. The area R1 recessed from the other area R2 is disposed between the two guide holes 2e.

  A rectangular hole 2 f is formed in the upper surface 2 c, and the optical fiber 3 inside the ferrule 2 can be visually recognized from the hole 2 f. Also, the hole 2 f is an introduction hole for the adhesive. Therefore, the optical fiber 3 is bonded and fixed in the inside of the ferrule 2 by introducing the adhesive from the hole 2 f to the inside of the ferrule 2 in a state where the optical fiber 3 is disposed inside the ferrule 2.

  At the rear end face of the ferrule 2, an introduction hole for collectively receiving a plurality of optical fibers 3 is formed. The plurality of optical fibers are introduced in the form of, for example, a 0.25 mm strand, a 0.9 mm core, or a tape core. The ferrule 2 further includes a plurality of optical fiber holding holes 2d, and the optical fiber 3 is inserted into each of the optical fiber holding holes 2d. The optical fiber 3 is, for example, a single mode fiber. The plurality of optical fiber holding holes 2d penetrate from the above-mentioned introduction hole to the end 2a, and the tip surface 3a of each optical fiber 3 is exposed at the end face.

  Each optical fiber holding hole 2d penetrates in the connecting direction A1, and the central axis direction of each optical fiber holding hole 2d and the optical axis direction V2 of the optical fiber 3 coincide with the connecting direction A1. The end surfaces 3a of the plurality of optical fibers 3 are aligned along the direction A2 at the end surface. A set of plural end faces 3a arranged in a line is arranged in two stages in a direction A3 intersecting with the direction A2. The direction A3 is, for example, a direction orthogonal to the upper surface 2c. The connection direction A1, the direction A2, and the direction A3 are, for example, orthogonal to each other.

  In the region R1 of the end face, for example, the tip surfaces 3a of the plurality of optical fibers 3 are disposed at equal intervals, and 12 tip surfaces 3a aligned in the direction A2 are disposed in a pair in the upper and lower direction. The positions of the sets of the end surfaces 3a arranged in a line are vertically shifted with respect to a reference line L extending in the direction A2 through the center of the end surface. Further, the plurality of tip surfaces 3 a and the plurality of guide holes 2 e are disposed at positions symmetrical to each other with respect to the reference line L.

  The ferrule 22 of the mating connector 20 has, for example, the same configuration as the ferrule 2 of the optical connector 1, and the optical fiber 23 of the mating connector 20 has the same configuration as the optical fiber 3 of the optical connector 1. . Therefore, in the following, the description of the ferrule 22 and the optical fiber 23 is appropriately omitted.

  The end surface 3 a of the optical fiber 3 is, for example, flush with the end surface (region R <b> 1) of the ferrule 2. As described above, since the region R1 where the distal end surface 3a is exposed is located in the recess 2g recessed from the other regions R2, a gap is formed between the distal end surface 3a and the distal end surface 23a of the optical fiber 23. ing. The distance K of the connection direction A1 of the gap is, for example, not less than 3 μm and not more than 200 μm, and specifically 20 μm. Thereby, the distance between the end faces and the distance between the end faces 3a and 23a are defined.

  In the cross section of the optical fiber 3 along the optical axis, the normal direction V1 of the tip surface 3a of the optical fiber 3 is inclined with respect to the central axis direction of the optical fiber holding hole 2d, that is, the optical axis direction V2 of the optical fiber 3 ing. For example, assuming that the inclination angle in the normal direction V1 with respect to the optical axis direction V2 is the inclination angle θ, the inclination angle θ is 10 ° or more and 20 ° or less. The inclination angle θ corresponds to the inclination angle of the tip surface 3 a with respect to the plane orthogonal to the optical axis of the optical fiber 3.

  In the present embodiment, the normal direction of the end face of the ferrule 2 coincides with the normal direction V1 of the end face 3a. The optical path M of the light emitted from the end face 3a of the optical fiber 3 is refracted in the end face 3a in the direction opposite to the direction of the inclination of the end face 3a. Therefore, the central axis of the optical fiber 3 of the optical connector 1 and the central axis of the optical fiber 23 of the mating connector 20 are offset from each other in the refraction direction (direction A3).

  A method of manufacturing the optical connector 1 configured as described above will be described. Below, the manufacturing method of the optical connector 1 which has the ferrule 2 provided with the end surface which 2 d of optical fiber holding holes holding the optical fiber 3 mentioned above are opened is demonstrated.

  First, an adhesive is introduced into the hole 2 f of the ferrule 2. Next, a plurality of optical fibers 3 are inserted into the respective optical fiber holding holes 2 d from the introduction holes in the rear end face of the ferrule 2, and the plurality of optical fibers 3 are protruded from the end 2 a. That is, the optical fiber 3 is inserted into the optical fiber holding hole 2d to expose the optical fiber 3 to the end 2a (step of exposing the optical fiber to the end). Next, the adhesive is cured to adhesively fix the optical fiber 3 to the ferrule 2 (step of adhesively fixing the optical fiber to the ferrule). And the part which protrudes from the edge part 2a of the optical fiber 3 is cut | disconnected.

  After adhesively fixing the optical fiber 3 to the ferrule 2, as shown in FIGS. 3A and 3B, the end 2a of the ferrule 2 is turned upward. Then, milling of the end 2 a of the ferrule 2 and the optical fiber 3 is performed by the milling tool 10 provided with the end mill 11.

  The size of the end mill 11 is, for example, very small, and the end mill 11 can perform processing on the order of 0.1 μm. While rotating the end mill 11, the end mill 11 is brought into contact with the end 2a and the optical fiber 3 and moved in the directions A2 and A3. As a result, as shown in FIG. 1, the recess R in the area R1 where the optical fiber 3 is exposed at the end face is recessed from the other area R2 in the end 2a (step for removing the recess). After the recess 2g is formed by machining the milling tool 10 in this manner, the manufacture of the optical connector 1 is completed.

  Next, the effects obtained by the method of manufacturing the optical connector 1 will be described.

  In the method of manufacturing the optical connector 1, the concave portion 2 g in which the region R <b> 1 where the optical fiber 3 at the end face is exposed is recessed from the other region R <b> 2 of the end portion is cut. Therefore, the region R1 in the end face where the optical fiber 3 is exposed is provided in the recess 2g. Therefore, since the end surface 3a of the optical fiber 3 does not abut the mating connector 20 at the time of connection, the end surface 3a of the optical fiber 3 is not worn even if the attachment and detachment are repeated.

  Further, since the region R1 where the optical fiber 3 at the end face is exposed is a region not in physical contact, adhesion of foreign particles can be avoided even if foreign particles enter the region R1. Therefore, cleaning for removing foreign matter can be easily performed. Further, by forming the recess 2g in the end portion 2a, the spacer described above can be made unnecessary, and a gap can be formed between the tip surfaces 3a, 23a of the optical fibers 3, 23. Thus, since the spacer can be eliminated, the optical connector 1 which can be easily designed and manufactured and can be handled easily can be manufactured.

  Further, in the step of grinding the recess 2 g described above, the end 2 a and the optical fiber 3 are milled by the end mill 11. Therefore, by milling the end 2a using the minute end mill 11, the recess 2g can be cut with high accuracy. Therefore, not limited to the recess 2g, recesses of various shapes different from the recess 2g can be formed with high accuracy.

  In addition, since the normal direction V1 of the end face of the optical connector 1 is inclined with respect to the central axis direction of the optical fiber holding hole 2d, the return light from the end face toward the mating connector 20 is greatly increased from the optical fiber holding hole 22d. It can be released. Furthermore, the normal direction V1 of the tip surface 3a of the optical fiber 3 is inclined with respect to the optical axis direction V2 of the optical fiber 3. Therefore, the optical path M extending from the tip surface 3a is inclined in the direction A3 intersecting the optical axis of the optical fiber 3 by refraction at the tip surface 3a of the optical fiber 3, so that the optical fibers 3 and 23 are suitably optically connected. Can.

  An optical connection structure in which multiple reflections of light between the tip surfaces 3a and 23a are suppressed by setting the distance K between the tip surfaces 3a and 23a of the optical fibers 3 and 23 in the connection direction A1 to 3 μm to 200 μm. Can be realized. Further, by defining the distance between the end faces by the end face having the recessed part 2g recessed from the region R2, the distance can be easily shortened. Furthermore, although the lens is not used, the optical fibers 3 and 23 can be optically connected with low coupling loss.

  Further, in the end portion 2a, the region R2 which protrudes with respect to the recess 2g is formed in a frame shape surrounding the recess 2g. Therefore, when the optical connector 1 contacts the mating connector 20, the region R2 can be brought into contact with the ferrule 22 and the optical fiber 3 located in the recess 2g can be sealed. Thus, the entry of foreign matter into the recess 2g can be suppressed more reliably.

Second Embodiment
Next, an optical connector 31 according to the second embodiment and a method of manufacturing the optical connector 31 will be described with reference to FIG. The optical connector 31 has a ferrule 32 having an end 32a different in shape from the end 2a of the first embodiment. In the following, the description overlapping with the first embodiment will be omitted.

  The end 32a has a region R3 where the optical fiber 3 at the end face is exposed and another region R4 at the end. The region R3 forms a recess 32g recessed with respect to the region R4. The region R3 has a rectangular shape extending in the entire direction A3. The region R4 indicates a region other than the region R3, and this region R4 is provided on both sides of the region R3 in the direction A2.

  Next, a method of manufacturing the optical connector 31 will be described. The steps of exposing the optical fiber to the end and bonding and fixing the optical fiber to the ferrule are the same as in the first embodiment. After bonding and fixing the optical fiber 3 to the ferrule 32, as shown in FIGS. 5A and 5B, the polishing tool with the end 32a of the ferrule 32 facing downward and the end 32a disposed below it Make it face 40. An abrasive 41 is disposed on the top of the polishing tool 40.

  Then, the end 32 a is placed on the abrasive 41, and the ferrule 32 is moved in the direction A 3 with respect to the abrasive 41 such that the end 32 a is rubbed against the abrasive 41. As a result, the end 32a and the optical fiber 3 are scraped, and the recess 32g is scraped (step of polishing the end and the optical fiber with an abrasive, and scraping the recess). After the recess 32g is formed as described above, the manufacture of the optical connector 31 is completed.

  As described above, according to the optical connector 31 and the method for manufacturing the optical connector 31 according to the second embodiment, the recess 32g in which the region R3 where the optical fiber 3 at the end face is exposed is recessed from the other region R4 of the end 32a Create Therefore, the same effect as that of the first embodiment can be obtained. As in the second embodiment, it is also possible to form the recess 32 g using the abrasive 41.

  Further, in the end face, the region R3 forming the recess 32g extends in the entire direction A3. Therefore, the recess 32g can be scraped off by relatively sliding the abrasive 41 in the direction A3, so that the recess 32g can be easily formed. Furthermore, the end face can be easily cleaned by extending the recess 32g in the entire direction A3.

Third Embodiment
Subsequently, a method of manufacturing the optical connector according to the third embodiment will be described with reference to FIGS. 6A and 6B. In the third embodiment, the optical connector 31 is manufactured by a method different from that of the second embodiment.

  In the third embodiment, the optical connector 31 is manufactured using the grinding tool 50 provided with the grinding stone 51. The grinding wheel 51 has, for example, a disk shape, and processes the ferrule 32 and the optical fiber 3 by rotating. The grinding tool 50 cuts the recess 32g by sliding the grinding wheel 51 rotated with the end 32a facing up to the end 32a. The shape and size of the grinding stone 51 mounted on the grinding tool 50 are appropriately changed according to the shape and size of the recess 32g.

  As described above, in the third embodiment, the end 32 a and the optical fiber 3 are ground by the grinding stone 51 in the step of grinding the recess 32 g. Therefore, by using grinding wheels 51 of various shapes and sizes, it is possible to form recesses 32 g of various shapes and sizes. The recess 32 g can also be formed using the end mill 11 of the first embodiment.

Fourth Embodiment
Next, an optical connector according to a fourth embodiment will be described with reference to FIG. 7A. The optical connector according to the fourth embodiment has a ferrule 62 having an end 62a different in shape from the ends 2a and 32a. The end portion 62a has a region R5 forming a recess 62g recessed from the other region R6, and a flat inclined surface R7 which is inclined with respect to the region R5 and the region R6.

  The region R5 is connected to the other region R6 via the inclined surface R7, and the region R5 and the region R6 are smoothly connected by having the inclined surface R7. The recess 62g provided with the inclined surface R7 can be manufactured using any of the above-described milling tool 10, polishing tool 40 and grinding tool 50.

  As described above, in the method of manufacturing the optical connector according to the fourth embodiment, in the step of shaving the recess 62g, the region R5 and the region R6 are located between the region R5 where the optical fiber 3 is exposed and the other region R6. An inclined surface R7 is formed. Therefore, the region R5 where the optical fiber 3 is exposed and the other region R6 are smoothly connected by the inclined surface R7. Therefore, it is possible to make it difficult for foreign matter to enter the recess 62g, and it is possible to easily perform cleaning.

  As mentioned above, although the manufacturing method of the optical connector which concerns on embodiment was demonstrated, the manufacturing method of the optical connector which concerns on this invention is not restricted to above-mentioned each embodiment, A various deformation | transformation is possible. For example, as shown in FIG. 7B, instead of the flat inclined surface R7, an inclined surface R8 curved in a curved shape from the recess 62g may be provided. Also in this case, the same effect as described above can be obtained.

  In the above embodiment, the normal direction V1 of the end face of the ferrule 2 is inclined with respect to the central axis direction of the optical fiber holding hole 2d, that is, the optical axis direction V2 of the optical fiber 3. However, the normal direction of the end face of the ferrule and the tip face of the optical fiber may not be inclined with respect to the central axis direction of the optical fiber holding hole and the optical axis direction of the optical fiber. In this case, an anti-reflection film may be formed on the tip surfaces 3a and 23a of the optical fibers 3 and 23 for the purpose of preventing reflection. By forming the anti-reflection film, it is possible to reduce the Fresnel loss generated at the tip surfaces 3a and 23a of the optical fibers 3 and 23. The antireflective film is formed at least on the end faces 3a and 23a. However, if it is difficult to form a film only on the end face 3a, 23a, an anti-reflection film may be formed on the end 2a, 22a or the like of the ferrule 2, 22 other than the end face 3a, 23a.

  In addition, connect the optical fiber or GI fiber with different mode field diameter to the tip end face 3a, 23a of the optical fiber 3, 23 (fusion bonding or welding) or enlarge the mode field diameter of the optical fiber 3, 23 May be As means for this expansion, thermal diffusion using a burner or the like, or diffusion using an arc discharge, etc. may be mentioned. By enlarging the mode field diameter, the effect of reducing the light loss due to the optical axis misalignment of the two opposing optical connectors 1 and 20 can be obtained.

  Further, in the embodiment described above, by cutting the recesses such as the recesses 2g, 32g, 62g, etc., between the end face where the tip end face 3a of the optical fiber 3 is exposed and the end face where the tip end face 23a of the optical fiber 23 is exposed. An example of forming a gap has been described. Here, the gap may be formed by providing a recess having a depth of K / 2 at each of the end portions 2a and 22a of the two ferrules 2 and 22 connected to each other. Further, the gap may be formed by providing a recess having a depth of K only at one end (either the end 2a or the end 22a) of the two ferrules 2 and 22. Furthermore, although the present invention is applied to the ferrule 2 which is a multi-core ferrule provided with a plurality of optical fibers 3 in the above embodiment, the present invention is also applicable to a single-core ferrule.

DESCRIPTION OF SYMBOLS 1, 31 ... Optical connector, 2, 22, 32, 62 ... Ferrule, 2a, 22a, 32a, 62a ... End part, 2b ... Side surface, 2c ... Upper surface, 2d ... Optical fiber holding hole, 2e ... Guide hole, 2f ... Hole, 2g, 32g, 62g ... Recess, 3, 23 ... Optical fiber, 3a, 23a ... Tip face, 10 ... Milling tool, 11 ... End mill, 20 ... Counterpart connector, 40 ... Abrasive tool, 41 ... Abrasive, 50 ... grinding tool, 51 ... grinding wheel, A1 ... connection direction, A2, A3 ... direction, K ... interval, L ... reference line, M ... light path, R1, R2, R3, R4, R5, R6 ... area, R7, R8 ... inclined surface, V1 ... normal direction, V2 ... optical axis direction, θ ... inclination angle.

Claims (5)

What is claimed is: 1. A method of manufacturing an optical connector comprising:
Inserting the optical fiber into the optical fiber holding hole to expose the optical fiber to the end of the ferrule;
Adhesively securing the optical fiber to the ferrule;
Processing the end portion and the optical fiber, and cutting an area where the optical fiber is exposed at the end surface is recessed in a more recessed area than the other area at the end portion;
Method of manufacturing an optical connector comprising: In the step of grinding the recess, the end and the optical fiber are milled by an end mill.
A method of manufacturing an optical connector according to claim 1. In the step of grinding the recess, the end and the optical fiber are ground by a grinding wheel.
A method of manufacturing an optical connector according to claim 1. In the step of grinding the recess, the end and the optical fiber are polished with an abrasive.
A method of manufacturing an optical connector according to claim 1. In the recessing step, an inclined surface which is inclined with respect to the area where the optical fiber is exposed and the other area is formed between the area where the optical fiber is exposed and the other area.
The manufacturing method of the optical connector as described in any one of Claims 1-4.

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