Classifications

• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
  • G02B6/24—Coupling light guides
  • G02B6/36—Mechanical coupling means
  • G02B6/38—Mechanical coupling means having fibre to fibre mating means
  • G02B6/3807—Dismountable connectors, i.e. comprising plugs
  • G02B6/3873—Connectors using guide surfaces for aligning ferrule ends, e.g. tubes, sleeves, V-grooves, rods, pins, balls
  • G02B6/3885—Multicore or multichannel optical connectors, i.e. one single ferrule containing more than one fibre, e.g. ribbon type
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
  • G02B6/24—Coupling light guides
  • G02B6/36—Mechanical coupling means
  • G02B6/3628—Mechanical coupling means for mounting fibres to supporting carriers
  • G02B6/3632—Mechanical coupling means for mounting fibres to supporting carriers characterised by the cross-sectional shape of the mechanical coupling means
  • G02B6/3644—Mechanical coupling means for mounting fibres to supporting carriers characterised by the cross-sectional shape of the mechanical coupling means the coupling means being through-holes or wall apertures
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
  • G02B6/24—Coupling light guides
  • G02B6/36—Mechanical coupling means
  • G02B6/38—Mechanical coupling means having fibre to fibre mating means
  • G02B6/3807—Dismountable connectors, i.e. comprising plugs
  • G02B6/381—Dismountable connectors, i.e. comprising plugs of the ferrule type, e.g. fibre ends embedded in ferrules, connecting a pair of fibres
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
  • G02B6/24—Coupling light guides
  • G02B6/36—Mechanical coupling means
  • G02B6/38—Mechanical coupling means having fibre to fibre mating means
  • G02B6/3807—Dismountable connectors, i.e. comprising plugs
  • G02B6/3873—Connectors using guide surfaces for aligning ferrule ends, e.g. tubes, sleeves, V-grooves, rods, pins, balls
  • G02B6/3882—Connectors using guide surfaces for aligning ferrule ends, e.g. tubes, sleeves, V-grooves, rods, pins, balls using rods, pins or balls to align a pair of ferrule ends
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
  • G02B6/24—Coupling light guides
  • G02B6/26—Optical coupling means
  • G02B6/32—Optical coupling means having lens focusing means positioned between opposed fibre ends

Definitions

• One aspect of the present disclosure relates to a ferrule and an optical connector.
• Non-Patent Document 1 discloses an MT including 32 optical fiber holding holes into which optical fibers are inserted and held, and two guide holes into which guide pins for positioning are inserted.
• the ferrule is listed.
• the MT connector is assembled by housing this MT ferrule in the MP housing.
• Optical coupling between the pair of M P O connectors is realized by inserting each of the pair of M P O connectors into the inside of the adapter and connecting the M T ferrules to each other by P C (Physical contact).
• Patent Document 1 describes an optical connector and an optical connection structure.
• the optical connector consists of a plurality of optical fibers, a ferrule that holds the plurality of optical fibers together, and a spacer that is provided on the end face of the ferrule of the ferrule and that defines the distance from the mating connector. Equipped with.
• the spacer is a plate with an opening. The tip surface of each optical fiber is exposed at the opening of the spacer.
• Patent Document 2 describes a ferrule including a front part connected to a mating connector, a rear part located on the opposite side of the mating connector, and an intermediate part connecting the front part and the rear part to each other. Has been done.
• the front part is rectangular.
• a pair of guide holes are inserted in the front part to insert guide pins for positioning.
• Inside the ferrule multiple optical fibers are inserted and held respectively. ⁇ 2020/175 288 2 ⁇ (:171? 2020 /006610
• a fiber holding hole is formed.
• the pair of guide holes are arranged side by side along the longitudinal direction of the rectangular front part.
• a recess recessed from the front is formed between the pair of guide holes.
• On the bottom surface of the recess, a plurality of lenses of the plurality of optical fibers to which they are optically coupled are exposed.
• This ferrule constitutes a lens connector that performs non-contact spatial coupling in which multiple lenses do not contact the mating connector when the front part abuts the mating connector.
• Patent Document 3 describes an IV! Ding ferrule having a guide hole into which a guide pin for positioning is inserted.
• the guide hole is cut in a plane orthogonal to the optical axis, the cross-sectional shape of the guide hole is non-circular.
• the guide hole has a plurality of recesses that are recessed radially outward and extend in the optical axis direction. When the guide pin is inserted into this guide hole, dust enters the above recess.
• Patent Document 1 International Publication No. 2 0 1 7/0 7 3 4 08
• Patent Document 2 U.S. Patent Application Publication No. 2 0 1 2/0 0 9 3 4 6 2 Specification
• Patent Document 3 U.S. Patent Application Publication No. 2 0 1 7/0 0 3 1 1 0 6 Specification
• Non-Patent Document 1 I Technical Review 1 ⁇ 1 ⁇ 0.18 8 "High precision 3 2 core 1 ⁇ / 1 ferrule that can be connected to a single mode optical fiber" Overview of the invention
• the ferrule according to the aspect is an optical connector ferrule to which a mating connector is connected.
• the ferrule has an optical fiber holding hole into which an optical fiber is inserted and held, and a guide hole into which a guide pin for positioning with a mating connector is inserted.
• the end is formed between the optical surface including the opening of the optical fiber holding hole, the guide hole exposed surface including the guide hole opening, and the optical surface and the guide hole exposed surface.
• Fig. 1 is a perspective view showing a ferrule and a guide pin according to a first embodiment.
• Fig. 2 is a vertical cross-sectional view of the guide pin and the step portion of Fig. 1.
• Fig. 3 is a view showing a cross section and a step portion of the guide pin of Fig. 1.
• FIG. 4 is a perspective view showing a ferrule and a guide pin according to a second embodiment.
• FIG. 5 is a perspective view showing a ferrule and a guide pin according to a third embodiment.
• FIG. 6 is a vertical cross-sectional view showing the guide pin, the stepped portion, and the optical surface of FIG.
• FIG. 7 is a perspective view showing a ferrule and a guide pin according to a fourth embodiment.
• FIG. 8 is a perspective view showing a ferrule and a guide pin according to a fifth embodiment.
• FIG. 9 is a longitudinal sectional view showing a ferrule and a guide pin according to a modification.
• the opening has a frame shape. Therefore, if dust enters inside the opening, it may be difficult to remove the invaded dust. Furthermore, if dust gets inside the opening, ⁇ 2020/175 288 4 (:171? 2020/006610
• the guide hole is produced by kneading and molding a core pin in a molten resin, and when forming a recess in the guide hole, the shape of the core pin has to be a special shape. Therefore, for example, it is difficult to form recesses in submicron units. From the above, there is still a possibility that dust may get into the optical surface when connecting to the mating connector, so it is necessary to reliably prevent the dust from entering the optical surface.
• An object of the present disclosure is to provide a ferrule and an optical connector that can reliably prevent dust from entering the optical surface.
• the ferrule according to one embodiment is an optical connector ferrule to which a mating connector is connected.
• the ferrule has an optical fiber holding hole into which an optical fiber is inserted and held, and a guide hole into which a guide pin for positioning with the partner side connector is opened.
• the end portion includes an optical surface including the opening of the optical fiber holding hole, a guide hole exposed surface including the guide hole opening, and a step portion formed between the optical surface and the guide hole exposed surface. Equipped with.
• the optical connector according to the embodiment includes the above-mentioned ferrule, and the optical fiber of the ferrule/the optical fiber inserted into and held in the holding hole.
• the ferrule and the optical connector are provided with an end portion where an optical fiber holding hole into which an optical fiber is inserted and held, and a guide hole into which a guide pin is inserted are opened.
• An optical surface including the opening of the optical fiber holding hole and a guide hole exposed surface including the opening of the guide hole are formed at the end, and between the optical surface and the guide hole exposed surface.
• a stepped portion is formed at. Even if dust adheres to the base of the guide pin, this step prevents the dust from entering the optical surface from the exposed surface of the guide hole. Therefore, it is possible to reduce the possibility that the optical path of the light emitted from the optical surface is obstructed, and it is possible to suppress the deterioration of the connection quality of the optical coupling.
• the ferrule and the optical connector do not need to have a special shape, such as a non-circular shape, as the shape of the guide hole because the step prevents the dust from entering the optical surface. As described above, the shape of the guide hole can be formed with high accuracy, and dust can be reliably prevented from entering the optical surface.
• the exposed surface of the guide hole may be the bottom surface of a concave portion that is recessed with respect to the optical surface.
• the optical surface projects from the exposed surface of the guide hole, so that dust is stored in the exposed surface of the guide hole, which is the bottom surface of the recess. Therefore, it is possible to reliably prevent dust from entering the optical surface from the exposed surface of the guide hole, which is the bottom surface of the recess.
• the stepped portion may be a convex portion that projects with respect to the optical surface.
• the convex portion is formed between the exposed surface of the guide hole and the optical surface, it is possible to prevent the dust from entering the optical surface by the convex portion.
• the shape of the boundary portion of the guide hole exposed surface viewed from the connection direction to which the mating connector is connected is curved or linear, and the width of the guide hole exposed surface is 1
• the depth of the exposed surface of the guide hole may be 1501 or more.
• the maximum size of dust that can penetrate between the optical connector and the mating connector is about 150. Therefore, if the width and depth of the exposed surface of the guide hole is 150 or more, it is possible to more reliably suppress dust from exceeding the step portion. As a result, it is possible to more surely prevent dust from entering the optical surface.
• At least a part of the above-mentioned exposed surface of the guide hole may be opened at the time of connection with the mating connector.
• at least a part of the exposed surface of the guide hole forms an opening space at the time of connection with the mating connector, it is possible to further reduce the possibility that dust is caught between the ferrule and the mating connector. As a result, it is possible to prevent dust from entering the optical surface and to prevent dust from reaching the end of the ferrule. ⁇ 2020/175 288 6 (:171? 2020/006610
• FIG. 1 is a perspective view showing an optical connector 1 provided with a ferrule 10 according to the first embodiment.
• FIG. 2 is a cross-sectional view showing the structure of the guide pin inserted into the guide hole 11 of the ferrule 10 of FIG. 1 and its surroundings.
• the optical connector 1 is connected, for example, to the mating connector ⁇ 3 along the connection direction 0 1.
• the mating connector ⁇ may be the same as the optical connector 1 or may be an optical connector different from the optical connector 1.
• the optical connector 1 includes a ferrule 10 and an optical fiber 20.
• the contact surface of the optical connector 1 for example, the contact surface 33 described later
• the contact surface of the mating connector ⁇ contact each other.
• the Fell_l_10 is, for example, 1 ⁇ /1 Ding_fell_l.
• Fer_10 is composed of polyphenylene sulfide (3) containing glass filler.
• the main component of the material of ferrule 10 is 3.
• the ferrule 10 is provided with one end of the connection direction port 1 and is in contact with the mating connector (3), a rear end part 16 provided at the other end of the connection direction port 1 and a connection direction port.
• a side portion 17 extending along 1 and an upper portion 18 and a lower portion 19 are provided.
• a pair of side parts 17 are arranged side by side along a direction port 2 which intersects the connection direction port 1. ⁇ 2020/175 288 7 ⁇ (:171? 2020/006610
• the upper part 18 and the lower part 19 are arranged side by side along a direction port 3 which intersects both the connecting direction 0 1 and the connecting direction 0 2.
• the direction 0 2 is, for example, the longitudinal direction of the end portion 15 having a rectangular shape, and the direction port 3 is the width direction of the end portion 15.
• the connection direction 0 1, the direction port 2 and the direction 0 3 are, for example, orthogonal to each other.
• a window hole 183 is formed in the upper portion 18 so that the optical fiber 20 inside the ferrule 10 can be viewed.
• the window hole 183 is an introduction hole of an adhesive agent for fixing the optical fiber 20 inside the ferrule 10 by adhesion. Therefore, the adhesive is introduced into the ferrule 10 from the window hole 1 8 3 while the optical fiber 20 is arranged inside the ferrule 10, so that the optical fiber 20 is generated inside the ferrule 10. Adhesive fixed.
• the ferrule 10 has a guide hole 11 into which a guide pin is inserted and a plurality of optical fiber holding holes 12 into which an optical fiber 20 is inserted and held.
• the ferrule 10 is a 12-core ferrule having 12 optical fiber holding holes 12 arranged along the direction opening 2.
• the guide hole 11 and the optical fiber holding hole 12 are both open to the end 15 of the ferrule 10.
• the guide hole 11 is, for example, in the shape of a cylindrical hole, not in a special shape.
• the guide hole 11 and the optical fiber holding hole 12 are both open to both the end portion 15 and the rear end portion 16 of the ferrule 10 and are connected to the connection direction opening 1 inside the ferrule 10. Running along.
• the plurality of guide holes 11 and the plurality of optical fiber holding holes 12 are arranged side by side along the direction port 2.
• the ferrule 10 has a pair of guide holes 11 and the pair of guide holes 11 are arranged at both ends of the plurality of optical fiber holding holes 12 in the direction 0 2.
• the ferrule 10 has a plurality of optical fiber holding holes 12 arranged along the direction 02. A plurality of optical fibers/ ⁇ retaining holes 12 and that of a plurality of optical fibers 20 are inserted and retained therein.
• the optical fiber 20 is, for example, a single mode fiber having a core and a cladding.
• the central axis direction of each optical fiber holding hole 12 and the optical axis direction of the optical fiber 20 coincide with the connection direction port 1, for example. ⁇ 2020/175 288 8 ⁇ (:171? 2020 /006610
• the end portion 15 includes an optical surface 31 including the opening of the optical fiber holding hole 12 and a guide hole.
• the optical surface 31 is, for example, a horizontally long rectangular shape at the end portion 15.
• the optical surface 31 is located at the center of the direction opening 3 at the end portion 15.
• Guide hole exposed surface 3 For example, 2 are provided at two locations on the end portion 15 and are formed into an annular shape surrounding the opening of the guide hole 11.
• the contact surface 3 3 is, for example, the optical surface 3 1 at the end portion 15. It is provided outside the guide hole exposed surface 32 and has a frame shape surrounding the optical surface 31 and the guide hole exposed surface 32.
• Fig. 3 is a cross-sectional view of the guide pin showing the guide pin and the exposed surface 32 of the guide hole.
• the guide hole exposed surface 32 has an annular shape that surrounds the guide hole 11. That is, the shape of the boundary between the guide hole exposed surface 3 2 and the contact surface 33 as viewed from the connection direction port 1 is annular (curved).
• a step portion 13 is formed between the guide hole exposed surface 3 2 and the optical surface 3 1, and the guide hole exposed surface 3 2 is a concave portion recessed in the step portion 1 3.
• the guide hole exposed surface 32 is a portion for accommodating dust.
• the step portion 13 is a portion that suppresses the intrusion of dust from the guide hole exposed surface 32 to the optical surface 31. That is, the dust is prevented from entering the optical surface 31 by accommodating the dust in the guide hole exposed surface 32, which is a recessed portion inside the stepped portion 13. Furthermore, even if dust gets in between the optical connector 1 and the mating connector ⁇ 3, Since dust is stored in the guide hole exposed surface S 2, it is possible to suppress the formation of a gap between the optical connector 1 and the mating connector C.
• the diameter D of the guide pin P is, for example, not less than 0.547 mm and not more than 0.699 mm. However, the diameter mouth can be modified accordingly.
• the guide hole exposed surface S 2 is concentric with the guide pin P.
• the width of the guide hole exposed surface S 2 corresponds to the distance between the boundaries of the guide hole exposed surface S 2, for example.
• the depth H of the exposed guide hole surface S 2 corresponds to the depth from the contact surface S 3 to the bottom surface of the recess of the exposed guide hole surface S 2.
• the width of the guide hole exposed surface S 2 whose boundary with the contact surface S 3 is annular (curved) is, for example, 150 mm or more.
• the upper limit of the width B is such that the exposed surface S 2 of the guide hole does not reach the optical surface S 1.
• the depth H of the exposed surface S 2 of the guide hole in the step portion 13 in the connection direction D 1 is 150 ⁇ m or more.
• the dust used in the optical connector wiring standard "TIA/EIA-455-35-AF0TP-35-Fiber Optic Component Dust (Fine Sand) Test J" is 100-mesh screen.
• the 100-mesh-screen has a grid-like mesh with one side of 150 Mm. Therefore, as described above, the guide hole for accommodating dust is exposed. If the width B and the depth H of the surface S 2 are both 150 Mm or more, the dust is more surely accommodated in the guide hole exposed surface S 2 and the optical connector 1 and the partner side connector C are separated. It is possible to suppress the formation of gaps due to dust between them.
• the optical connector 1 and the ferrule 10 have an end 1 at which an optical fiber ⁇ holding hole 12 where the optical fiber 20 is inserted and held and a guide hole 11 where the guide pin P is inserted are opened. Equipped with 5.
• An optical surface S 1 including the opening of the optical fiber holding hole 12 and an exposed surface S 2 of the guide hole including the opening of the guide hole 11 are formed on the end portion 15.
• a step portion 13 is formed between 1 and the exposed surface S 2 of the guide hole. Even if dust adheres to the base of the guide pin P, the stepped portion 13 causes the optical path from the exposed surface S 2 of the guide hole. ⁇ 2020/175 288 10 ⁇ (:171? 2020 /006610
• the guide hole 11 has a special shape such as a non-circular shape. No need.
• an annular guide hole exposed surface 32 surrounding the guide hole 11 may be formed around the guide hole 11. From the above, it is possible to make the shape of the guide hole 11 highly accurate and to reliably prevent dust from entering the optical surface 31.
• the guide hole exposed surface 32 is the bottom surface of the concave portion that is recessed in the connection direction 0 1 with respect to the optical surface 3 1. Therefore, when the optical surface 3 1 projects toward the connection direction opening 1 with respect to the guide hole exposed surface 32, dust is stored in the guide hole exposed surface 32, which is the bottom surface of the recess. Therefore, it is possible to prevent dust from entering the optical surface 31 from the guide hole exposed surface 32, which is the bottom surface of the recess.
• the shape of the boundary between the guide hole exposed surface 32 and the contact surface 33 when viewed from the connection direction port 1 is curved, and the guide hole is
• the width of the exposed surface 32 is 150 or more
• the depth 1 to 1 of the guide hole exposed surface 32 is 150 or more.
• the maximum size of dust that can enter between the optical connector 1 and the mating connector ⁇ is about 150. Therefore, if the width and depths 1 to 1 of the guide hole exposed surface 32 are 150 or more, it is possible to more reliably suppress the dust from exceeding the step portion 13. As a result, intrusion of dust into the optical surface 31 can be suppressed more reliably.
• the ferrule 30 according to the second embodiment will be described with reference to FIG. As shown in FIG. 4, the ferrule 30 according to the second embodiment has an end portion 35 different from the end portion 15 described above. In the following description, in order to avoid duplication, the same description as that of the above-described embodiment will be appropriately omitted.
• the end portion 35 has a guide hole including the opening of the guide hole 11. ⁇ 2020/175 288 1 1 ⁇ (:171? 2020/006610
• the guide hole exposed surface 34 is a concave portion that is recessed toward the connection direction port 1 with respect to the optical surface 31.
• the guide hole exposed surface 34 is provided, for example, at both ends of the end portion 35 in the direction 02.
• the guide hole exposed surface 34 is, for example, a rectangular shape that extends in both the direction 0 2 and the direction 0 3 and extends to the end in the direction 0 2 on the front surface of the ferrule 30 (a boundary portion with the contact surface 33). Is a straight line).
• the contact surfaces 33 are provided on both sides of the direction opening 3 of the optical surface 31.
• the mating connector (3 When connecting to the mating connector ⁇ 3, the mating connector (3 contacts the optical surface 31 and the contact surface 33, but does not contact the exposed guide hole surface 34. That is, the optical surface 31 and the contact surface When the mating connector (3) comes into contact with the surface 33, open spaces are formed at both ends of the guide hole exposed surface 34 in the direction 0 2 and the direction 0 3 side. It is formed between the exposed surface 34, the stepped portion 33, and the mating connector (3).
• a step portion 33 is formed between the guide hole exposed surface 34 and the optical surface 31.
• a pair of step portions 33 are arranged along the direction opening 2.
• the guide hole exposed surface 34 is the bottom surface of the concave portion which is recessed in the connecting direction 0 1 in the step portion 33.
• Each step portion 33 extends from one end of the direction port 3 of the end portion 35 to the other end.
• the step portion 33 is a portion that does not allow dust to enter from the guide hole exposed surface 34 to the center side in the direction 0 2 (the optical surface 31 and the contact surface 33 side). Dust can be discharged to the edge side.
• the ferrule 30 according to the second embodiment includes the guide hole exposed surface 34 and the end portion 35 on which the step portion 33 is formed, and the stepped portion 33 causes the guide hole exposed surface 34.
• the invasion of dust from 34 to the optical surface 31 is suppressed. Therefore, the same effect as the first embodiment can be obtained.
• At least a part of the guide hole exposed surface 34 (both ends of the direction port 2 and the direction port 3 side) forms an open space when connected to the mating connector ⁇ 3.
• the ferrule 40 differs from the above-described embodiments in that the ferrule 40 has an end portion 45 that does not have a concave guide hole exposed surface.
• the end portion 45 is provided between the optical surface 31 and the guide hole exposed surface 35 including the opening of the guide hole 11 and the step provided between the optical surface 31 and the guide hole exposed surface 35. Parts 4 3 and.
• the height of the guide hole exposed surface 35 is the same as the height of the optical surface 31.
• the step portion 43 is a convex portion that protrudes with respect to the optical surface 31.
• the step portion 43 is, for example, an annular film adhered to the ferrule 40. That is, in the third embodiment, the step portion 43 which is a film is attached by adhesion.
• adhesion may be not only bonding using an adhesive, but also mechanical adhesion, chemical adhesion, dispersion adhesion, electrostatic adhesion or welding.
• the step portion 43 has an annular shape and is attached to a position surrounding the guide hole 11 at the end portion 45.
• the material of the step portion 43 may be the same as the material of the ferrule 40, for example.
• the material of the step 43 is May be
• the step portion 43 may be attached after the optical surface 31 is polished. In this case, it is possible to avoid the problem that the step portion 43 is peeled off by polishing.
• the step portion 43 may be a step portion formed by resin molding of the ferrule 40.
• the ferrule 40 according to the third embodiment includes the guide hole exposed surface 35 and the end portion 45 on which the step portion 43 is formed, and the guide hole exposed surface is formed by the step portion 43. Invasion of dust from 35 to the optical surface 31 is suppressed. Therefore, the same effect as each of the above-described embodiments can be obtained. Since a convex portion (step portion 43) is formed between the guide hole exposed surface 35 and the optical surface 31, the convex portion causes dust on the optical surface 31. ⁇ 2020/175 288 13 ⁇ (:171? 2020 /006610
• ferrule 40 is provided with the convex step portion 43, it is possible to use a normal 1 ⁇ /1-piece ferrule as the ferrule 40.
• the ferrule 50 according to the fourth embodiment will be described with reference to FIG.
• the fourth embodiment is different from each of the above-described embodiments in that it has an end portion 55 having a linear step portion 53.
• the end portion 5 5 includes an optical surface 31 located between the pair of step portions 5 3 and a pair of step portion 5 3 extending to the direction opening 3 on both ends of the direction opening 2 of the optical surface 31.
• a pair of step portions 5 3 have guide hole exposed surfaces 36 located at both ends in the direction 0 2.
• the step portion 53 like the step portion 43 described above, is a convex portion that projects with respect to the optical surface 31 and is, for example, a film adhered to the ferrule 50.
• the ferrule 50 according to the fourth embodiment has a guide hole exposed surface 36 and a step portion 5
• the step portion 5 3 suppresses the invasion of dust from the guide hole exposed surface 36 to the optical surface 31 by providing the end portion 55 formed with 3.
• the convex portion step portion 53
• the same operational effect as described above can be obtained.
• the fifth embodiment differs from each of the above-described embodiments in that the fifth embodiment includes an end portion 65 having a frame-shaped step portion 63.
• the end portion 65 has a rectangular optical surface 31, a rectangular frame-shaped step portion 63, and a guide hole exposed surface 37 located outside the optical surface 31 when viewed from the step portion 63.
• the step portion 63 may be a film adhered to the ferrule 60, as described above.
• the step portion 63 is a convex portion that projects in the connection direction 0 1 with respect to the optical surface 3 1.
• the ferrule 60 according to the fifth embodiment includes the guide hole exposed surface 37 and the end portion 65 where the step portion 63 is formed on the outer side of the optical surface 31. ⁇ 2020/175 288 14 ⁇ (:171? 2020 /006610
• the film to be bonded that is, the stepped portion 43, 53, 6 which is a convex portion that suppresses the invasion of dust to the optical surface 31 by bonding.
• An example of forming 3 has been described.
• the means for forming the stepped portion is not limited to adhesion and can be changed as appropriate.
• a convex step portion 83 that is integrally molded by resin molding may be provided.
• the step of forming the convex portion by post-processing can be omitted.
• the ferrule 80 is connected from the guide hole exposed surface 38 including the opening of the guide hole 81, the step portion 8 3 which is a convex portion protruding from the guide hole exposed surface 38, and the step portion 8 3.
• an optical surface 39 that is recessed in the direction 0 1.
• the end 85 of the ferrule 80 has a recess 8 6 recessed in the connection direction mouth 1 with respect to the guide hole exposed surface 38, and the bottom of the recess 8 6 is the optical surface 39. It is said that.
• On the optical surface 39 there are formed a plurality of convex lenses 88 which are optically coupled to the plurality of optical fibers 90 which are abutted against the inner wall surface 87 of the ferrule 80.
• the optical connector 70 is a lens connector having a plurality of convex lenses 88 on the bottom surface of the concave portion 86 of the ferrule 80. For example, divergent light is emitted from each optical fiber 90, and the divergent light is converted into collimated light by the convex lens 88.
• the step portion 83 is formed between the optical surface 39 and the optical surface 39, the same effects as those of the above-described embodiments can be obtained. Further, in the optical connector 70 and the ferrule 80, since the convex lens 88 is formed on the optical surface 39 which is the bottom surface of the concave portion 86, it is not necessary to polish the optical surface 39 and the like. Therefore, even if the step portion 83 is formed by integral molding of resin, it is possible to prevent the step portion 83 from being peeled off by polishing.
• the annular guide hole exposed surface 32 that is concentric with the guide pin has been described.
• the shape of the guide hole exposed surface 32 viewed from the connection direction port 1 may be, for example, a linear shape, a polygonal shape such as a triangular shape or a quadrangular shape, or an oval shape, and can be appropriately changed.
• the 12-core ferrule having the 12 optical fiber holding holes 12 arranged along the direction port 2 has been described.
• the number of cores of the ferrule and the optical connector may be, for example, 16 cores, 24 cores (1 2 cores 2 rows) or 32 cores (1 6 cores x 2 rows), and can be appropriately changed.

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• Optics & Photonics (AREA)
• Mechanical Coupling Of Light Guides (AREA)
• Optical Couplings Of Light Guides (AREA)

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