WO2021192746A1 - 光接続構造、フェルール、及び光コネクタ - Google Patents

光接続構造、フェルール、及び光コネクタ Download PDF

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Publication number
WO2021192746A1
WO2021192746A1 PCT/JP2021/005960 JP2021005960W WO2021192746A1 WO 2021192746 A1 WO2021192746 A1 WO 2021192746A1 JP 2021005960 W JP2021005960 W JP 2021005960W WO 2021192746 A1 WO2021192746 A1 WO 2021192746A1
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WO
WIPO (PCT)
Prior art keywords
ferrule
convex portion
concave portion
adapter
optical
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2021/005960
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
祥 矢加部
元佳 木村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Electric Industries Ltd
Japan Communication Accesories Manufacturing Co Ltd
Original Assignee
Sumitomo Electric Industries Ltd
Japan Communication Accesories Manufacturing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sumitomo Electric Industries Ltd, Japan Communication Accesories Manufacturing Co Ltd filed Critical Sumitomo Electric Industries Ltd
Priority to CN202180023334.9A priority Critical patent/CN115315650A/zh
Priority to US17/913,260 priority patent/US20230141449A1/en
Priority to JP2022509409A priority patent/JPWO2021192746A1/ja
Publication of WO2021192746A1 publication Critical patent/WO2021192746A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • G02B6/38—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
    • G02B6/3825—Dismountable connectors, i.e. comprising plugs of the ferrule type, e.g. fibre ends embedded in ferrules, connecting a pair of fibres with an intermediate part, e.g. adapter, receptacle, linking two plugs
    • 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
    • G02B6/3833—Details of mounting fibres in ferrules; Assembly methods; Manufacture
    • G02B6/3853—Lens inside the ferrule
    • 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
    • G02B6/3874—Connectors using guide surfaces for aligning ferrule ends, e.g. tubes, sleeves, V-grooves, rods, pins, balls using tubes, sleeves to align ferrules

Definitions

  • the present disclosure relates to optical connection structures, ferrules, and optical connectors.
  • This application claims priority based on Japanese Application No. 2020-058285 filed on March 27, 2020, and incorporates all the contents described in the Japanese application.
  • Patent Document 1 discloses a technique for aligning multi-core optical fibers with each other using a guide pin.
  • one end of a pair of guide pins is inserted into a pair of guide pin insertion holes provided on the tip surface of the ferrule, and a pair of guide pin insertion holes are inserted into the pair of guide pin insertion holes provided on the tip surface of the ferrule to be connected.
  • the other ends of the guide pins of the above are inserted respectively.
  • the alignment of the multi-core optical fibers that is, the alignment of the multi-core optical fiber and the multi-core optical fiber of the connection partner
  • the optical connection structure has a plurality of optical fibers, a ferrule holding the plurality of optical fibers, and a tubular shape, and the ferrule and other ferrules face each other inside the tubular shape. It is provided with an adapter into which the ferrule is inserted and fitted so as to.
  • the ferrule has a first side surface and a second side surface facing each other.
  • the first side surface is provided with a first concave portion or a first convex portion extending along a first direction in which the ferrule is inserted into the adapter.
  • the second side surface is provided with a second concave portion or a second convex portion extending along the first direction.
  • the inner surface of the adapter has a third convex portion or a third concave portion that can be fitted with the first concave portion or the first convex portion, and a fourth convex portion or a fourth concave portion that can be fitted with the second concave portion or the second convex portion. And are provided.
  • the ferrule according to the embodiment of the present disclosure includes a plurality of optical fiber holding portions for holding a plurality of optical fibers, and first side surfaces and second side surfaces facing each other.
  • the first side surface is provided with a first concave portion or a first convex portion extending along a first direction in which a plurality of optical fiber holding portions extend.
  • the second side surface is provided with a second concave portion or a second convex portion extending along the first direction.
  • the optical connector according to the embodiment of the present disclosure includes the above-mentioned ferrule and a plurality of optical fibers each held by a plurality of optical fiber holding portions.
  • FIG. 1A is a perspective view showing a state in which an optical connector is attached to an adapter in the optical connection structure according to the embodiment.
  • FIG. 1B is a perspective view showing a state in which the optical connector is removed from the adapter in the optical connection structure according to the embodiment.
  • FIG. 2 is a perspective view showing a ferrule according to an embodiment.
  • FIG. 3 is a front view showing a ferrule according to an embodiment.
  • FIG. 4 is a cross-sectional view of the ferrule along line IV-IV of FIG.
  • FIG. 5 is a cross-sectional view showing an adapter in a state in which a ferrule is inserted and fitted.
  • FIG. 6 is a cross-sectional view showing an adapter in a state in which a ferrule is inserted and fitted in the optical connection structure according to the first modification.
  • FIG. 7 is a cross-sectional view showing an adapter in a state in which a ferrule is inserted and fitted in the optical connection structure according to the second modification.
  • FIG. 8 is a cross-sectional view of the adapter along line VIII-VIII of FIG.
  • the optical connection structure according to the embodiment of the present disclosure has a plurality of optical fibers, a ferrule holding the plurality of optical fibers, and a tubular shape, and the ferrule and other ferrules face each other inside the tubular shape. It is provided with an adapter into which the ferrule is inserted and fitted so as to.
  • the ferrule has a first side surface and a second side surface facing each other. The first side surface is provided with a first concave portion or a first convex portion extending along a first direction in which the ferrule is inserted into the adapter.
  • the second side surface is provided with a second concave portion or a second convex portion extending along the first direction.
  • the inner surface of the adapter has a third convex portion or a third concave portion that can be fitted with the first concave portion or the first convex portion, and a fourth convex portion or a fourth concave portion that can be fitted with the second concave portion or the second convex portion. And are provided.
  • the plurality of optical fibers can be positioned without providing the guide pin insertion hole in the ferrule.
  • it is not necessary to use a guide pin having high dimensional accuracy for positioning between the plurality of optical fibers that is, positioning between the plurality of optical fibers and the plurality of optical fibers to be connected.
  • the ferrule may further have a plurality of optical fiber holding portions that each hold a plurality of optical fibers.
  • the plurality of optical fiber holding portions may be arranged side by side along the second direction intersecting the first direction.
  • a configuration in which a plurality of optical fibers are positioned can be preferably realized by inserting the ferrule into the adapter and fitting the ferrule.
  • each of the first concave portion or the first convex portion and the second concave portion or the second convex portion may have a V shape.
  • the ferrule can be accurately positioned with respect to the adapter. That is, the positioning of the plurality of optical fibers can be performed with high accuracy.
  • each of the third convex portion or the third concave portion and the fourth convex portion or the fourth concave portion may have a V shape.
  • the ferrule can be accurately positioned with respect to the adapter. That is, the positioning of the plurality of optical fibers can be performed with high accuracy.
  • the first side surface may be provided with a first recess
  • the second side surface may be provided with a second recess.
  • the inner surface of the adapter may be provided with a third convex portion that can be fitted with the first concave portion and a fourth convex portion that can be fitted with the second concave portion.
  • the first concave portion or the first convex portion may be in contact with the third convex portion or the third concave portion, and the second concave portion or the second convex portion is the fourth concave portion. It may be possible to contact the convex portion or the fourth concave portion. In this case, since the misalignment of the ferrule with respect to the adapter can be suppressed, the positioning of the plurality of optical fibers can be performed with high accuracy.
  • At least one of the third convex portion or the third concave portion and the fourth convex portion or the fourth concave portion may be configured to be elastically deformable in the second direction intersecting the first direction.
  • the ferrule since the ferrule can be easily inserted into the adapter, the workability when inserting the ferrule into the adapter is improved. Further, when the ferrule is inserted into the adapter, the first concave portion or the first convex portion and the second concave portion or the second convex portion are formed into the third convex portion or the third concave portion and the fourth convex portion or the fourth concave portion.
  • the adapters are located on both sides of the third convex portion or the third concave portion and the fourth convex portion or the fourth concave portion in the second direction, and the third convex portion or the third concave portion and the fourth convex portion or the fourth concave portion. It may have a pair of regions each of which is provided with a recess. A hollow portion may be provided in a region of the pair of regions where at least one of the third convex portion or the third concave portion and the fourth convex portion or the fourth concave portion is provided. In this case, at least one of the third convex portion or the third concave portion and the fourth convex portion or the fourth concave portion can be easily elastically deformed in the second direction. As a result, the ferrule can be more easily inserted into the adapter, and the workability when inserting the ferrule into the adapter is further improved.
  • the ferrule according to the embodiment of the present disclosure includes a plurality of optical fiber holding portions for holding a plurality of optical fibers, and first side surfaces and second side surfaces facing each other.
  • the first side surface is provided with a first concave portion or a first convex portion extending along a first direction in which a plurality of optical fiber holding portions extend.
  • the second side surface is provided with a second concave portion or a second convex portion extending along the first direction.
  • the first concave portion or the first convex portion and the second concave portion or the second convex portion are used as positioning guides for the adapter so as to be in the plane perpendicular to the first direction.
  • the position of the ferrule with respect to the adapter (that is, the position of a plurality of optical fibers held by the ferrule) can be specified in the above. That is, by using the adapter into which the ferrule is inserted and fitted as a positioning member when positioning the plurality of optical fibers, the plurality of optical fibers can be positioned without providing the guide pin insertion hole in the ferrule.
  • the plurality of optical fiber holding portions may be arranged side by side along the second direction intersecting the first direction.
  • a configuration in which a plurality of optical fibers are positioned can be preferably realized by inserting the ferrule into the adapter and fitting the ferrule.
  • each of the first concave portion or the first convex portion and the second concave portion or the second convex portion may have a V shape.
  • the ferrule can be accurately positioned with respect to the adapter. That is, the positioning of the plurality of optical fibers can be performed with high accuracy.
  • the optical connector according to the embodiment of the present disclosure includes any of the above-mentioned ferrules and a plurality of optical fibers each held by a plurality of optical fiber holding portions. Since this optical connector includes any of the ferrules described above, it is possible to position a plurality of optical fibers with a simple configuration as described above.
  • FIG. 1A is a perspective view showing a state in which the optical connector 2 is attached to the adapter 40 in the optical connection structure 1 according to the present embodiment.
  • FIG. 1B is a perspective view showing a state in which the optical connector 2 is removed from the adapter 40 in the optical connection structure 1 according to the present embodiment.
  • the optical connection structure 1 includes an optical connector 2 and an adapter 40 into which the optical connector 2 is inserted.
  • the optical connector 2 has an optical fiber tape core wire 5 that accommodates a plurality of optical fibers 10, and a ferrule 20 that is attached to the tip of the optical fiber tape core wire 5 via boots 15.
  • the ferrule 20 has, for example, a substantially rectangular parallelepiped appearance.
  • the ferrule 20 is made of, for example, a material such as PPS (polyphenylene sulfide), PEI (polyetherimide), PC (polycarbonate), PMMA (polymethylmethacrylate), or PES (polyethersulfone).
  • PPS polyphenylene sulfide
  • PEI polyetherimide
  • PC polycarbonate
  • PMMA polymethylmethacrylate
  • PES polyethersulfone
  • the adapter 40 has a tubular shape that can accommodate the ferrule 20.
  • the adapter 40 is fitted with the ferrule 20 so that the tip surface 21 of the ferrule 20 and the tip surface of the ferrule (not shown) of the connection partner face each other inside the adapter 40.
  • the adapter 40 may be, for example, PEI (polyetherimide), PBT (polybutylene terephthalate), PPS (polyphenylene sulfide), PC (polycarbonate), PMMA (polymethylmethacrylate), PES (polyethersulfone), or PA ( It is made of an elastic material having elasticity such as polyamide).
  • the same material as the ferrule 20 as the material of the adapter 40.
  • the material of the adapter 40 may contain a filler or an additive for improving slidability. Inside the adapter 40, the tip surface of the ferrule 20 and the tip surface of the ferrule to be connected may be in contact with each other or may be separated from each other with a predetermined distance.
  • the plurality of optical fibers 10 of the optical fiber tape core wire 5 extend along the direction D1 and are arranged side by side along the direction D2 intersecting (for example, orthogonal to) the direction D1.
  • a plurality of optical fibers 10 are arranged in a plurality of stages inside the optical fiber tape core wire 5.
  • the plurality of optical fibers 10 are inserted along the direction D1 into the plurality of optical fiber holes H (see FIG. 4 described later) formed inside the ferrule 20.
  • FIG. 2 is a perspective view showing the ferrule 20.
  • FIG. 3 is a front view showing the ferrule 20.
  • FIG. 4 is a cross-sectional view of the ferrule 20 along the IV-IV line of FIG.
  • the longitudinal direction of the ferrule 20 is along the direction D1
  • the lateral direction of the ferrule 20 is along the direction D2
  • the thickness direction of the ferrule 20 (that is, up and down).
  • the direction) is along the direction D3 which intersects (for example, orthogonally) the directions D1 and D2.
  • the ferrule 20 connects the front end surface 21 located at the tip of the direction D1, the rear end surface 22 located at the rear end of the direction D1, the front end surface 21 and the rear end surface 22, and extends along the direction D1. It has two sides 23, 24, 25 and 26.
  • the front end surface 21 and the rear end surface 22 extend along the directions D2 and D3.
  • a light transmitting surface 21a is provided at the center of the tip surface 21.
  • the light transmitting surface 21a is slightly recessed toward the rear end surface 22 in the direction D1 with respect to the front end surface 21.
  • a plurality of lenses 21b are provided on the light transmitting surface 21a.
  • the optical axis of each lens 21b is arranged so as to overlap the central axis of each optical fiber 10 when viewed from the direction D1.
  • Each optical fiber 10 is in contact with the back surface 21c of each lens 21b (that is, a surface located on the opposite side of each lens 21b in the direction D1).
  • each optical fiber 10 The light emitted from each optical fiber 10 is collimated by each lens 21b and then incident on each optical fiber of the connection partner.
  • the central axis of the optical fiber 10 and the optical axis of the lens 21b may be deviated from each other.
  • the end surface of the optical fiber 10 or the surface of the lens 21b may be inclined by, for example, 8 ° with respect to the direction D3.
  • the sides 23 and 24 face each other in direction D3 and extend along directions D1 and D2. In one example, the sides 23 and 24 extend parallel to each other.
  • the side surface 23 is provided with openings 23a and 23b.
  • the opening 23a is located on the tip surface 21 side in the direction D1 with respect to the opening 23b.
  • a plurality of optical fiber holes H for holding the plurality of optical fibers 10 are provided inside the ferrule 20.
  • the plurality of optical fiber holes H extend along the direction D1 and are arranged side by side along the direction D2.
  • a plurality of optical fibers 10 are inserted into and fixed to the plurality of optical fiber holes H.
  • the plurality of optical fiber holes H penetrate the ferrule 20 between the openings 23a and 23b.
  • the plurality of optical fiber holes H are arranged so as to correspond to the plurality of optical fibers 10.
  • a plurality of optical fibers 10 are inserted into the plurality of optical fiber holes H, respectively.
  • the adhesive is injected into the ferrule 20 through the openings 23a and 23b.
  • the space formed inside the ferrule 20 is filled with the adhesive, and the position of each optical fiber 10 inserted into each optical fiber hole H is fixed.
  • a V-groove may be formed inside the ferrule 20 as an optical fiber holding portion.
  • the optical fiber 10 may be placed on the V-groove, and the optical fiber 10 may be pressed by the lid member from above the V-groove.
  • the side surface 25 and the side surface 26 face each other in the direction D2 and extend along the directions D1 and D3.
  • the sides 25 and 26 extend parallel to each other.
  • the side surface 25 is provided with a V-groove 31 extending along the direction D1.
  • the side surface 26 is provided with a V-groove 32 extending along the direction D1.
  • the V-grooves 31 and 32 have a V-shape in a cross section perpendicular to the direction D1.
  • the V-grooves 31 and 32 are provided, for example, continuously extending from the front end surface 21 to the rear end surface 22 along the direction D1. That is, the V-grooves 31 and 32 extend over the entire length of direction D1 of the ferrule 20.
  • the V-grooves 31 and 32 are provided at positions facing each other in the direction D2. That is, when viewed from the direction D2, the position of the V-groove 31 on the side surface 25 coincides with the position of the V-groove 32 on the side surface 26.
  • the V-groove 31 is located, for example, in the central portion of the side surface 25 in the direction D3, and the V-groove 32 is located, for example, in the central portion of the side surface 26 in the direction D3.
  • the opening angle of the V-groove 31 (that is, the angle formed by the pair of surfaces forming the V-groove 31) is, for example, 45 ° or more and 120 ° or less.
  • the opening angle of the V-groove 31 may be, for example, 60 ° or more and 100 ° or less, or 90 °.
  • the bottom of the V-groove 31 is rounded, for example, and the diameter of the inscribed circle in contact with the roundness is set to, for example, 0.7 mm.
  • the V-groove 32 has, for example, the same shape as the V-groove 31.
  • FIG. 3 shows the shortest distance W1 between the V-groove 31 and the V-groove 32 facing each other along the direction D2.
  • the shortest distance W1 can be defined as the shortest distance between the bottom of the V-groove 31 and the bottom of the V-groove 32 in the direction D2.
  • the distance L1 between the side surface 25 and the plurality of lenses 21b can be set without considering the outer diameter of the guide pin insertion hole. Therefore, the distance L1 between the side surface 25 and the plurality of lenses 21b can be set smaller than the shortest distance between the side surface 25 and the plurality of lenses 21b when the guide pin insertion holes are provided.
  • the distance L1 between the side surface 26 in the direction D2 and the plurality of lenses 21b (specifically, the lens 21b closest to the side surface 26 in the direction D2) is also the distance between the side surface 25 and the plurality of lenses 21b in the direction D2. It can be set in the same way as L1.
  • the maximum width of the ferrule 20 in the direction D2 (that is, the maximum distance between the side surface 25 and the side surface 26 in the direction D2) can be made smaller than the maximum width in the direction D2 of the ferrule when the guide pin insertion hole is provided. .. As a result, the ferrule 20 can be miniaturized.
  • a chamfered portion C1 is provided at a portion where the tip surface 21 and the V groove 31 intersect.
  • the chamfered portion C1 is formed so as to have an inverted tapered shape from the tip surface 21 to the V groove 31, and is continuously connected to the V groove 31.
  • the chamfered portion C1 may be smoothly connected to the V-groove 31.
  • a chamfered portion C2 is provided at a portion where the tip surface 21 and the V-groove 32 intersect.
  • the chamfered portion C2 has the same shape as the chamfered portion C1.
  • the chamfered portion C2 is continuously connected to the V groove 32.
  • the chamfered portion C2 may be smoothly connected to the V-groove 32.
  • FIG. 5 is a cross-sectional view showing an adapter 40 in a state where the ferrule 20 is inserted and fitted.
  • the adapter 40 has, for example, a rectangular cylinder extending along the direction D1.
  • the total length of the direction D1 of the adapter 40 is longer than, for example, the total length of the direction D1 of the ferrule 20.
  • the adapter 40 has an insertion hole 41 that constitutes the inside of a rectangular cylinder.
  • the insertion hole 41 penetrates the adapter 40 along the direction D1.
  • the insertion hole 41 has a rectangular shape when viewed from the direction D1, and is composed of four inner surfaces 43, 44, 45, and 46.
  • the inner surfaces 43 and 44 face each other in direction D3 and extend along directions D1 and D2.
  • the inner surface 43 faces the side surface 23 of the ferrule 20 in the direction D3. In one example, the inner surface 43 extends parallel to the side surface 23.
  • the inner surface 44 faces the side surface 24 of the ferrule 20 in direction D3. In one example, the inner surface 44 extends parallel to the side surface 24.
  • the inner surfaces 45 and 46 face each other in direction D2 and extend along directions D1 and D3.
  • the inner surface 45 faces the side surface 25 of the ferrule 20 in the direction D2.
  • the inner surface 45 may extend parallel to the side surface 25.
  • the inner surface 46 faces the side surface 26 of the ferrule 20 in direction D2.
  • the inner surface 46 may extend parallel to the side surface 26.
  • the adapter 40 has four outer surfaces 47, 48, 49, and 50 that form a rectangular tubular outer shape.
  • the outer surfaces 49 and 50 do not necessarily have to form a rectangular cylindrical outer shape.
  • the outer surfaces of the V protrusions 51 and 52 may be exposed to the outside of the adapter 40.
  • the inner surface 45 is provided with a V protrusion 51 extending along the direction D1.
  • the inner surface 46 is provided with a V protrusion 52 extending along the direction D1.
  • the V protrusions 51 and 52 have a V shape in a cross section perpendicular to the direction D1.
  • the V protrusion 51 is provided, for example, on the inner surface 45 so as to extend continuously over the direction D1. That is, the V protrusion 51 extends over the entire length of the direction D1 of the adapter 40.
  • the V protrusion 52 is provided, for example, on the inner surface 46 so as to extend continuously over the direction D1. That is, the V protrusion 52 extends over the entire length of the direction D1 of the adapter 40.
  • the length of the direction D1 of the V protrusion 51 is longer than, for example, the length of the direction D1 of the V groove 31.
  • the length of the direction D1 of the V protrusion 52 is longer than the length of the direction D1 of the V groove 32, for example.
  • the V protrusions 51 and 52 are provided at positions facing each other in the direction D2. That is, when viewed from the direction D2, the position of the V protrusion 51 on the inner surface 45 coincides with the position of the V protrusion 52 on the inner surface 46.
  • the V protrusions 51 and 52 are provided so as to guide the V grooves 31 and 32 of the ferrule 20, respectively.
  • the V protrusion 51 is provided so as to be fitted with the V groove 31 of the ferrule 20. That is, the V protrusion 51 is provided at a position facing the V groove 31 in the direction D2, and has a shape corresponding to the V groove 31.
  • the angle of the V protrusion 51 (that is, the angle formed by the pair of surfaces forming the V protrusion 51) is, for example, 45 ° or more and 120 ° or less.
  • the angle of the V protrusion 51 may be, for example, 60 ° or more and 100 ° or less, or 90 °.
  • the top of the V protrusion 51 is, for example, rounded, and the diameter of the inscribed circle in contact with the roundness is set to, for example, 0.7 mm.
  • the V protrusion 52 is provided so as to be fitted with the V groove 32 of the ferrule 20. That is, the V protrusion 52 is provided at a position facing the V groove 32 in the direction D2, and has a shape corresponding to the V groove 32.
  • the V protrusion 52 has, for example, the same shape as the V protrusion 51.
  • FIG. 5 shows the shortest distance W2 between the V protrusions 51 and the V protrusions 52 facing each other along the direction D2.
  • the shortest distance W2 can be defined as the shortest distance between the top of the V protrusion 51 and the top of the V protrusion 52 in the direction D2 when the ferrule 20 is not inserted into the adapter 40.
  • the adapter 40 has a pair of regions R1 and R2 outside the insertion hole 41 in the direction D2.
  • the pair of regions R1 and R2 are located on both sides of the V projections 51 and 52 in the direction D2.
  • One region R1 is located between the inner surface 45 and the outer surface 49 in the direction D2.
  • the other region R2 is located between the inner surface 46 and the outer surface 50 in the direction D2.
  • a pair of hollow holes 61 and 62 are provided in the pair of regions R1 and R2, respectively.
  • the hollow holes 61 and 62 extend, for example, along the V projections 51 and 52, respectively. That is, the hollow holes 61 and 62 extend over the entire length of direction D1 of the adapter 40, for example.
  • Each of the hollow holes 61 and 62 has a substantially rectangular shape when viewed from the direction D1, for example.
  • the hollow hole 61 is adjacent to the inner surface 45 of the insertion hole 41 at a predetermined interval in the direction D2.
  • the region sandwiched between the hollow hole 61 and the insertion hole 41 in the direction D2 is configured as a wall portion 71 that separates the hollow hole 61 and the insertion hole 41.
  • the thickness of the wall portion 71 is, for example, constant.
  • the wall portion 71 extends between the hollow hole 61 and the insertion hole 41 along the direction D3.
  • the wall portion 71 extends along the shape of the inner surface 45 provided with the V protrusion 51.
  • the portion of the wall portion 71 where the V protrusion 51 is provided projects toward the ferrule 20 side in the direction D2 so as to follow the shape of the V protrusion 51.
  • the wall portion 71 includes a pair of portions P1 and P2 connected to the portion where the V protrusion 51 is provided at a position sandwiched in the direction D3.
  • the portions P1 and P2 extend along a direction slightly inclined from the direction D3 in the cross section shown in FIG. In the cross section shown in FIG. 5, the inclination angles of the portion P1 and the portion P2 with respect to the direction D3 are, for example, 5 ° or more and 15 ° or less, respectively.
  • the portion P1 is inclined so as to be located on the opposite side of the ferrule 20 in the direction D2 from the inner surface 43 toward the V protrusion 51 in the direction D3.
  • the portion P2 is inclined so as to be located on the opposite side of the ferrule 20 in the direction D2 from the inner surface 44 toward the V protrusion 51 in the direction D3.
  • the hollow hole 62 is adjacent to the inner surface 46 of the insertion hole 41 at a predetermined interval in the direction D2.
  • the region sandwiched between the hollow hole 62 and the insertion hole 41 in the direction D2 is configured as a wall portion 72 that separates the hollow hole 62 and the insertion hole 41.
  • the thickness of the wall portion 72 is, for example, constant.
  • the wall portion 72 extends between the hollow hole 62 and the insertion hole 41 along the direction D3.
  • the wall portion 72 extends along the shape of the inner surface 46 provided with the V protrusion 52.
  • the portion of the wall portion 72 where the V protrusion 52 is provided projects toward the ferrule 20 side in the direction D2 so as to follow the shape of the V protrusion 52.
  • the wall portion 72 includes a pair of portions P3 and P4 connected to the portion where the V protrusion 52 is provided at a position sandwiched in the direction D3.
  • the portions P3 and P4 extend along a direction slightly inclined from the direction D3 in the cross section shown in FIG. In the cross section shown in FIG. 5, the inclination angles of the portion P3 and the portion P4 with respect to the direction D3 are, for example, 5 ° or more and 15 ° or less, respectively.
  • the portion P3 is inclined so as to be located on the opposite side of the ferrule 20 in the direction D2 from the inner surface 43 toward the V protrusion 52 in the direction D3.
  • the portion P4 is inclined so as to be located on the opposite side of the ferrule 20 in the direction D2 from the inner surface 44 toward the V protrusion 52 in the direction D3.
  • each wall portion 71 and the wall portion 72 have a portion inclined from the direction D3, the base portion of the wall portion 71 is compared with the case where each wall portion 71 and the wall portion 72 are provided in parallel with the direction D3. (That is, the connection portion between the inner surfaces 43 and 44 and the wall portion 71) and the base portion of the wall portion 72 (that is, the connection portion between the inner surfaces 43 and 44 and the wall portion 72) can be suppressed from stress concentration. As a result, damage to each wall portion 71 and wall portion 72 can be suppressed.
  • the ferrule 20 and the ferrule 20 and the ferrule 20 are inserted so that the tip surface 21 of the ferrule 20 is first inserted into the adapter 40. Place the adapter 40. Then, by moving the ferrule 20 with respect to the adapter 40 along the direction D1, the ferrule 20 is inserted into the adapter 40.
  • the V-grooves 31 and 32 of the ferrule 20 are fitted into the V protrusions 51 and 52 of the adapter 40, respectively. At this time, the V protrusion 51 enters the V groove 31 and comes into contact with the V groove 31, and the V protrusion 52 enters the V groove 32 and comes into contact with the V groove 32.
  • the adapter 40 When the shortest distance W1 between the V groove 31 and the V groove 32 of the ferrule 20 is larger than the shortest distance W2 between the V protrusion 51 and the V protrusion 52 of the adapter 40 as in the present embodiment, the adapter 40 The V protrusions 51 and 52 enter the V grooves 31 and 32 of the ferrule 20 in a state of being compressed in the direction D2. That is, the V protrusions 51 and 52 of the adapter 40 receive a reaction force from the V grooves 31 and 32 of the ferrule 20 and elastically deform to the opposite side of the ferrule 20 (that is, the outside of the adapter 40) in the direction D2. Then, a force for the V protrusions 51 and 52 facing each other to return to their original positions is applied to the ferrule 20, and the ferrule 20 is sandwiched and fixed by the V protrusions 51 and 52.
  • the V protrusions 51 and 52 come into contact with the V grooves 31 and 32, respectively, and the gap between the V protrusion 51 and the V groove 31 in the direction D2 and the gap between the V protrusion 52 and the V groove 32 in the direction D2 are zero, respectively. become.
  • the position of the ferrule 20 with respect to the adapter 40 is defined in the directions D2 and D3, and the position of the ferrule 20 with respect to the adapter 40 in the rotation direction is defined.
  • a spring (not shown) attached to the rear of the ferrule 20 urges the ferrule 20 to the ferrule side of the connection partner in the direction D1, thereby defining the position of the ferrule 20 in the direction D1 with respect to the adapter 40. In this way, the plurality of optical fibers 10 are positioned.
  • the gap in the direction D3 between the V protrusion 51 and the V groove 31 (that is, the difference between the width of the V protrusion 51 and the width of the V groove 31) and the gap in the direction D3 between the V protrusion 52 and the V groove 32 (that is, that is).
  • a positional deviation or an angular deviation may occur between the ferrule 20 and the ferrule of the connection partner due to the size of these gaps. Therefore, it is desirable that these gaps are set to be as small as possible.
  • the V protrusions 51 and 52 form a part of the adapter 40 made of an elastic material. Therefore, in the present embodiment, both the V protrusions 51 and 52 are elastically deformable. However, only one of the V protrusions 51 and 52 may be elastically deformable. In this case, the hollow hole may be provided only in the region of the pair of regions R1 and R2 where either one of the V protrusions 51 and 52 is provided. That is, it is not necessary to provide a hollow hole in one region where one elastically deformable V protrusion is provided, and not to provide a hollow hole in the other region where the other elastically deformable V protrusion is provided.
  • the hollow hole 61 is provided in the region R1 where the V protrusion 51 is provided, while the hollow hole 62 is not provided in the region R2 where the V protrusion 52 is provided. You may.
  • the ferrule 20 is inserted into the adapter 40 and fitted, the ferrule 20 is arranged so as to abut the V groove 32 of the ferrule 20 against the V protrusion 52 that is not elastically deformed, and the ferrule 20 is placed on the elastically deformed V protrusion 51.
  • the V-groove 31 is brought into contact with the V-groove 31.
  • the V protrusion 51 receives a reaction force from the V groove 31 and elastically deforms. Then, when a force for the V protrusion 51 to return to the original position is applied to the ferrule 20, the ferrule 20 is sandwiched and fixed by the V protrusions 51 and 52. As a result, the position of the ferrule 20 with respect to the adapter 40 is defined as in the case where both the V protrusions 51 and 52 are elastically deformable. Similarly, when only the V protrusion 52 is elastically deformable, the hollow hole 62 is provided in the region R2 where the V protrusion 52 is provided, while the hollow hole 61 is provided in the region R1 where the V protrusion 51 is provided. It does not have to be. Also in this case, the position of the ferrule 20 with respect to the adapter 40 is defined by the elastic deformation of the V protrusion 52.
  • the optical connection structure 1, the ferrule 20, and the optical connector 2 according to the present embodiment described above will be described.
  • the V groove 31 is fitted into the V protrusion 51 and the V groove 32 is fitted. Is fitted to the V protrusion 52.
  • the position of the ferrule 20 with respect to the adapter 40 that is, the position of the plurality of optical fibers 10 held by the ferrule 20
  • D1 the position of the plurality of optical fibers 10 held by the ferrule 20
  • the plurality of optical fibers 10 can be inserted without providing guide pin insertion holes in the ferrule 20. Can be positioned.
  • it is not necessary to use a guide pin having high dimensional accuracy for positioning between the plurality of optical fibers 10 that is, positioning between the plurality of optical fibers 10 and the plurality of optical fibers to be connected.
  • a plurality of optical fibers 10 can be positioned with a simple configuration.
  • the plurality of optical fibers 10 and the plurality of optical fibers of the connection partner are connected to each other. It is desirable to minimize the angle deviation between them.
  • a guide slightly protruding from the insertion hole of the ferrule by making an optical connection of a plurality of optical fibers 10 using V grooves 31 and 32 provided over the entire length (for example, 8 mm) of the ferrule 20.
  • the rotation direction of the plurality of optical fibers 10 is more accurately regulated with respect to the plurality of optical fibers to be connected. Can be done. Therefore, according to the present embodiment, the angular deviation between the plurality of optical fibers 10 and the plurality of optical fibers of the connection partner can be suppressed to be smaller, so that the plurality of optical fibers 10 and the plurality of optical fibers of the connection partner can be suppressed. It is suitable for suppressing a decrease in connection loss between the optical fiber and the optical fiber.
  • the plurality of optical fiber holes H are arranged side by side along the direction D2. According to this configuration, a configuration in which a plurality of optical fibers 10 are positioned by inserting the ferrule 20 into the adapter 40 and fitting the ferrule 20 can be suitably realized.
  • each of the V groove 31 and the V groove 32 has a V shape in the cross section perpendicular to the direction D1.
  • each of the V protrusion 51 and the V protrusion 52 has a V shape.
  • the ferrule 20 can be accurately positioned with respect to the adapter 40 by fitting the V-groove 31 and the V-groove 32 into the V-projection 51 and the V-projection 52, respectively. That is, the positioning of the plurality of optical fibers 10 can be performed with high accuracy.
  • a V-groove 31 is provided on the side surface 25.
  • a V-groove 32 is provided on the side surface 26.
  • the inner surfaces 45 and 46 of the adapter 40 are provided with a V protrusion 51 that can be fitted with the V groove 31 and a V protrusion 52 that can be fitted with the V groove 32.
  • the V groove 31 is in contact with the V protrusion 51 and the V groove 32 is in contact with the V protrusion 52 in the plane perpendicular to the direction D1.
  • each of the V protrusions 51 and 52 is elastically deformable in the direction D2. As a result, the ferrule 20 can be easily inserted into the adapter 40, so that the workability when inserting the ferrule 20 into the adapter 40 is improved.
  • the shortest distance W1 between the V groove 31 and the V groove 32 is larger than the shortest distance W2 between the V protrusion 51 and the V protrusion 52 in the plane perpendicular to the direction D1.
  • the V grooves 31 and 32 abut on the V protrusions 51 and 52, respectively, and a force is applied to the ferrule 20 so that the V protrusions 51 and 52 return to their original positions. ..
  • the ferrule 20 is sandwiched and fixed by the V protrusions 51 and 52, so that the displacement of the ferrule 20 with respect to the adapter 40 is suppressed.
  • hollow holes 61 and 62 are provided in the regions R1 and R2 of the adapter 40, respectively.
  • the V protrusions 51 and 52 can be easily elastically deformed in the direction D2.
  • the ferrule 20 can be more easily inserted into the adapter 40, so that the workability when the ferrule 20 is inserted into the adapter 40 is further improved.
  • FIG. 6 is a cross-sectional view showing an adapter 40A in a state where the ferrule 20A is inserted in the optical connection structure according to the first modification.
  • V protrusions 31A and V protrusions 32A may be provided on the side surfaces 25 and 26 of the ferrule 20A instead of the V grooves 31 and 32.
  • the inner surfaces 45 and 46 of the adapter 40A may be provided with V-grooves 51A and V-grooves 52A instead of the V-projections 51 and 52.
  • the optical connection structure according to the present modification also has the same effect as the optical connection structure 1 according to the above-described embodiment.
  • both the V-grooves 51A and 52A are elastically deformable, as in the case of the optical connection structure 1 according to the above-described embodiment, and the V-grooves 51A and 52A do not need to be elastically deformable. Only one of them may be elastically deformable. In this case, the hollow hole may be provided only in the region of the pair of regions R1 and R2 where either one of the V-grooves 51A and 52A is provided.
  • the hollow hole 61 is provided in the region R1 where the V-groove 51A is provided, while the hollow hole 62 is not provided in the region R2 where the V-groove 52A is provided. You may.
  • the hollow hole 62 is provided in the region R2 where the V-groove 52A is provided, while the hollow hole 61 is not provided in the region R1 where the V-groove 51A is provided. good.
  • the position of the ferrule 20A with respect to the adapter 40A is defined by elastically deforming one of the elastically deformable V-grooves 51A and 52A. NS.
  • FIG. 7 is a cross-sectional view showing an adapter 40B in a state where the ferrule 20 is inserted and fitted in the optical connection structure according to the second modification.
  • the adapter 40B is made of a non-elastic material.
  • examples of the material of the adapter 40B include PPS (polyphenylene sulfide) and the like.
  • the pair of regions R1 and R2 of the adapter 40B are not provided with the hollow holes 61 and 62 in the above-described embodiment. That is, the regions R1 and R2 on both sides of the insertion hole 41 in the direction D2 are all filled with the material of the adapter 40B. In this structure, elastic deformation of the adapter 40B is less likely to occur even if a particularly hard material is not used as the material of the adapter 40B.
  • the inner surfaces 45 and 46 of the adapter 40B are provided with an arcuate protrusion 51B and an arcuate protrusion 52B, respectively, in place of the V protrusions 51 and 52.
  • the arcuate protrusions 51B and 52B have a semicircular shape in a cross section perpendicular to the direction D1.
  • the arcuate protrusion 51B extends along the direction D2 on the inner surface 45 of the adapter 40B.
  • the arcuate protrusion 52B extends along the direction D2 on the inner surface 46 of the adapter 40B.
  • FIG. 8 is a cross-sectional view of the adapter 40B along line VIII-VIII of FIG. In FIG. 8, the ferrule 20 is shown as a side view.
  • the one end portion 52a of the arcuate projection 52B in the direction D2 is located at a position slightly deviated from the one end surface 55 of the direction D1 of the adapter 40B toward the other end surface 56 side.
  • the other end 52b in the direction D2 of the arcuate protrusion is located at a position slightly deviated from the other end surface 56 toward the one end surface 55 in the direction D1.
  • the one end portion 52a is formed so as to taper toward the one end surface 55 side in the direction D1.
  • the other end portion 52b is formed so as to taper toward the other end surface 56 side in the direction D1.
  • the shortest distance W1 between the V groove 31 and the V groove 32 in the direction D2 is smaller than the shortest distance W2 between the arcuate protrusion 51B and the arcuate protrusion 52B in the direction D2. Therefore, a gap is formed between the arcuate protrusion 51B and the V-groove 31 in the direction D2 and between the arcuate protrusion 52B and the V-groove 32 in the direction D2.
  • the outer peripheral surface of the arcuate protrusion 51B abuts on the pair of surfaces forming the V groove 31, and the outer peripheral surface of the arcuate protrusion 52B abuts on each of the pair of surfaces forming the V groove 32.
  • the ferrule 20 is held by the arcuate protrusions 51B and 52B of the adapter 40B, and the plurality of optical fibers 10 are positioned.
  • the optical connection structure according to the present modification also has the same effect as the optical connection structure 1 according to the above-described embodiment.
  • the adapter 40B is made of a material that does not elastically deform, if the V grooves 31 and 32 are fitted to the V protrusions 51 and 52 as in the above-described embodiment, due to the influence of manufacturing tolerances and the like. As a result, a gap is likely to occur between the V-groove 31 and the V-projection 51 and between the V-groove 32 and the V-projection 52.
  • the position of the ferrule 20 with respect to the adapter 40 is significantly deviated depending on the contact position between the V groove 31 and the V protrusion 51 or the contact position between the V groove 32 and the V protrusion 52.
  • the ferrule 20 with respect to the adapter 40B depends on the contact position between the V-grooves 31 and 32 and the arcuate protrusions 51B and 52B. It is possible to suppress the situation where the misalignment of the above occurs. As a result, it is possible to suppress a decrease in the positioning accuracy of the optical fiber 10.
  • the optical connection structure, ferrule, and optical connector of the present disclosure are not limited to the above-described embodiment and each modification, and various other modifications are possible.
  • the above-described embodiments and modifications may be combined with each other according to the required purpose and effect.
  • the shapes of the ferrule and the adapter can be changed as appropriate.
  • the ferrule is provided with two concave portions or convex portions, but three or more concave portions or convex portions may be provided.
  • the adapter may be provided with three or more protrusions or recesses that fit into the three or more recesses or protrusions of the ferrule, respectively.
  • the shape of the concave or convex portion provided on the ferrule and the shape of the concave or convex portion provided on the adapter are not limited to the above-described embodiment and each modification, and can be changed as appropriate.
  • the recess provided in the ferrule and the adapter may be a groove having another shape such as an arc-shaped groove, a rectangular groove, or a trapezoidal groove in addition to the V-groove.
  • the convex portion provided on the ferrule and the adapter may be a protrusion having another shape such as a rectangular protrusion or a trapezoidal protrusion, in addition to the V protrusion and the arc-shaped protrusion.
  • the concave portion or convex portion does not have to extend from the front end surface to the rear end surface of the ferrule along the direction D2.
  • the concave portion or the convex portion provided on the ferrule may be separated from the front end surface side in the direction D2 from the front end surface side, or may be separated from the rear end surface side in the direction D2.
  • the recesses or protrusions provided on the adapter do not have to extend along the direction D2 over the entire length of the adapter.
  • the concave portion or the convex portion provided on the adapter may be separated from one end surface of the adapter in the direction D2 toward the other end surface side, or may be separated from the other end surface side in the direction D2 toward the one end surface side.
  • the recesses or protrusions may be provided on the side surfaces 23 and 24 facing each other along the direction D3 in the ferrules 20 and 20A, respectively.
  • the position of the concave portion or the convex portion provided on the side surface 25 and the position of the V groove provided on the side surface 26 may be deviated from each other.
  • the shape of the concave portion or the convex portion provided on the side surface 25 and the shape of the concave portion or the convex portion provided on the side surface 26 may be different from each other.
  • the side surface 25 may be provided with a V-groove, while the side surface 26 may be provided with an arcuate groove.
  • the side surface 25 may be provided with a V groove, while the side surface 26 may be provided with a V protrusion.
  • the recesses or protrusions may be provided on the inner surfaces 45 and 46 facing each other along the direction D3 in the adapters 40, 40A and 40B, respectively.
  • the position of the convex portion or the concave portion provided on the inner surface 45 and the position of the convex portion or the concave portion provided on the inner surface 46 may be deviated from each other.
  • the shape of the convex portion or the concave portion provided on the inner surface 45 and the shape of the convex portion or the concave portion provided on the inner surface 46 may be different from each other.
  • the inner surface 45 may be provided with a V-groove, while the inner surface 46 may be provided with an arcuate groove.
  • the inner surface 45 may be provided with a V groove, while the inner surface 46 may be provided with a V protrusion.
  • a plurality of lenses may not be formed on the tip surface of the ferrule.
  • the ferrule does not have to be composed of the light transmitting resin.
  • the ferrule may have a plurality of optical fiber grooves for holding a plurality of optical fibers, instead of the plurality of optical fiber holes for holding the plurality of optical fibers.
  • the entire adapter may not be made of elastic material, or a part of the adapter may be made of elastic material. For example, only the recesses or protrusions provided in the adapter may be made of elastic material.
  • Arc-shaped protrusion 52 ... V protrusion 52A ... V groove 52a ... One end 52B ... Arc-shaped protrusion 52b ... Other end 55 ... One end surface 56 ... Other End faces 61, 62 ... Hollow holes 71, 72 ... Wall C1 ... Chamfering C2 ... Chamfering D1 ... Direction D2 ... Direction D3 ... Direction H ... Optical fiber hole L1 ... Distance P1, P2, P3, P4 ... Part R1, R2 ... Areas W1, W2 ... Shortest distance

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mechanical Coupling Of Light Guides (AREA)
PCT/JP2021/005960 2020-03-27 2021-02-17 光接続構造、フェルール、及び光コネクタ Ceased WO2021192746A1 (ja)

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CN202180023334.9A CN115315650A (zh) 2020-03-27 2021-02-17 光连接结构、插芯以及光连接器
US17/913,260 US20230141449A1 (en) 2020-03-27 2021-02-17 Optical connection structure, ferrule, and optical connector
JP2022509409A JPWO2021192746A1 (https=) 2020-03-27 2021-02-17

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JP7775206B2 (ja) * 2020-09-25 2025-11-25 住友電気工業株式会社 フェルール、光コネクタ、及び光接続構造
JP1774046S (https=) * 2023-12-25 2024-06-26

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