WO2018110548A1 - Ensemble connecteur et module de transmission optique - Google Patents

Ensemble connecteur et module de transmission optique Download PDF

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Publication number
WO2018110548A1
WO2018110548A1 PCT/JP2017/044563 JP2017044563W WO2018110548A1 WO 2018110548 A1 WO2018110548 A1 WO 2018110548A1 JP 2017044563 W JP2017044563 W JP 2017044563W WO 2018110548 A1 WO2018110548 A1 WO 2018110548A1
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WO
WIPO (PCT)
Prior art keywords
connector
receptacle
optical fibers
orthogonal
orthogonal direction
Prior art date
Application number
PCT/JP2017/044563
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English (en)
Japanese (ja)
Inventor
昌志 古久保
将三 杉山
Original Assignee
株式会社村田製作所
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Filing date
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Application filed by 株式会社村田製作所 filed Critical 株式会社村田製作所
Publication of WO2018110548A1 publication Critical patent/WO2018110548A1/fr

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    • 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
    • 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
    • G02B6/42—Coupling light guides with opto-electronic elements

Definitions

  • the present invention relates to a connector set and an optical transmission module, and more particularly to a connector set for optically coupling an optical fiber and a light emitting element or a light receiving element, and an optical transmission module including the connector set.
  • an optical module described in Patent Document 1 is known as an invention related to a conventional connector set.
  • the optical module described in Patent Document 1 is provided at the tip of an optical fiber and includes an optical element.
  • the optical element converts an optical signal transmitted through the optical fiber into an electrical signal, or converts the electrical signal into an optical signal and outputs the optical signal to the optical fiber.
  • Such an optical module is inserted into a connector of an electronic device. Therefore, an electrical signal is exchanged between the optical module and the connector of the electronic device.
  • FIG. 13 is an exploded perspective view of the optical transmission module 510 described in Patent Document 2.
  • a direction from the plug 516 toward the receptacle 522 is defined as a forward direction.
  • the direction orthogonal to the front-back direction in a horizontal surface is defined as the left-right direction.
  • a direction perpendicular to the front-rear direction and the left-right direction is defined as the up-down direction.
  • the optical transmission module 510 includes a circuit board 512, a plug 516, an optical fiber 518, a receptacle 522, and a light receiving element array 524.
  • the plug 516 is provided at the tip of the optical fiber 518.
  • the light receiving element array 524 is mounted on the circuit board 512.
  • the receptacle 522 is mounted on the circuit board 512 so as to cover the light receiving element array 524.
  • the optical transmission module 510 as described above, when the plug 516 and the receptacle 522 are connected, the light receiving element array 524 and the optical fiber 518 are optically coupled. Therefore, an optical signal is exchanged between the plug 516 and the receptacle 522.
  • the optical transmission module described in Patent Document 2 since an electrical signal is not exchanged between the plug 516 and the receptacle 522, the possibility of noise being mixed into the electrical signal between the plug 516 and the receptacle 522 is reduced.
  • an object of the present invention is to provide a connector set that can increase the accuracy of optical coupling between an optical fiber and an optical element, and an optical transmission module including the connector set.
  • the connector set according to the first aspect of the present invention is: A connector set comprising a first connector and a second connector, When the first connector and the second connector are connected, a direction from the first connector toward the second connector is defined as a connection direction,
  • the first connector is provided at the tip of a plurality of optical fibers arranged in a first orthogonal direction that is a direction orthogonal to the connection direction;
  • the first connector is: A first passage surface that is substantially orthogonal to the connection direction and through which light emitted from the plurality of optical fibers or light incident on the plurality of optical fibers passes; A first side surface located on one side of the first orthogonal direction from the first passing surface and facing one side of the first orthogonal direction; A second side surface located on the other side of the first orthogonal direction from the first passage surface and facing the other side of the first orthogonal direction;
  • a first positioning part Have
  • the second connector is A second passage surface facing the first passage surface and through which light emitted from the plurality of optical fibers or
  • the connector set according to the second aspect of the present invention is: A connector set comprising a first connector and a second connector, When the first connector and the second connector are connected, a direction from the first connector toward the second connector is defined as a connection direction,
  • the first connector is provided at the tip of a plurality of optical fibers arranged in a first orthogonal direction that is a direction orthogonal to the connection direction;
  • the first connector is: A first passage surface that is substantially orthogonal to the connection direction and through which light emitted from the plurality of optical fibers or light incident on the plurality of optical fibers passes; A first positioning part;
  • the second connector is A second passage surface facing the first passage surface and through which light emitted from the plurality of optical fibers or light incident on the plurality of optical fibers passes;
  • the connector set according to the third aspect of the present invention is: A connector set comprising a first connector and a second connector, When the first connector and the second connector are connected, a direction from the first connector toward the second connector is defined as a connection direction,
  • the second connector is provided at the tip of a plurality of optical fibers arranged in a first orthogonal direction that is a direction orthogonal to the connection direction
  • the first connector is: A first passage surface that is substantially orthogonal to the connection direction and through which light emitted from the plurality of optical fibers or light incident on the plurality of optical fibers passes; A first side surface located on one side of the first orthogonal direction from the first passing surface and facing one side of the first orthogonal direction; A second side surface located on the other side of the first orthogonal direction from the first passage surface and facing the other side of the first orthogonal direction; A first positioning part;
  • Have The second connector is A second passage surface facing the first passage surface and through which light emitted from the plurality of optical fibers or light incident
  • the connector set according to the fourth aspect of the present invention is: A connector set comprising a first connector and a second connector, When the first connector and the second connector are connected, a direction from the first connector toward the second connector is defined as a connection direction,
  • the second connector is provided at the tip of a plurality of optical fibers arranged in a first orthogonal direction that is a direction orthogonal to the connection direction,
  • the first connector is: A first passage surface that is substantially orthogonal to the connection direction and through which light emitted from the plurality of optical fibers or light incident on the plurality of optical fibers passes; A first positioning part;
  • the second connector is A second passage surface facing the first passage surface and through which light emitted from the plurality of optical fibers or light incident on the plurality of optical fibers passes;
  • the optical transmission module according to the first aspect of the present invention is: Any one of the connector sets according to the first to fourth embodiments; A circuit board.
  • the optical transmission module according to the second aspect of the present invention is: Any one of the connector sets according to the first to fourth embodiments; A metal cap that covers a receptacle that is a connector of the first connector and the second connector that is not provided at the tip of an optical fiber.
  • the accuracy of optical coupling between the optical fiber and the optical element can be increased.
  • FIG. 1A is a view of the optical transmission module 10 as viewed from above.
  • FIG. 1B is a cross-sectional structure diagram along AA in FIG. 1A.
  • FIG. 2 is an exploded perspective view of the light transmission module 10.
  • FIG. 3A is an external perspective view of the receptacle 22.
  • FIG. 3B is an external perspective view of the receptacle 22.
  • FIG. 4A is an external perspective view of the metal cap 20.
  • FIG. 4B is a bottom view of the metal cap 20.
  • FIG. 5A is an external perspective view of the plug 16.
  • FIG. 5B is an external perspective view of the plug 16.
  • FIG. 6A is a view of the plug 16 as viewed from the front side.
  • FIG. 6B is a view of the plug 16 as viewed from the rear side.
  • FIG. 7 is a configuration diagram of the connector set 11a.
  • FIG. 8 is a configuration diagram of the connector set 11b.
  • FIG. 9 is a configuration diagram of the connector set 11c.
  • FIG. 10A is a perspective view of the circuit board 12A.
  • FIG. 10B is a plan view of the circuit board 12A and the receptacle 22 of the optical transmission module according to the first modification viewed from above.
  • FIG. 10C is a cross-sectional structural view of the vicinity of the ventilation recess 13a in BB of FIG. 10B.
  • FIG. 10D is a cross-sectional structure diagram near the adhesive receiving recess 13b in CC of FIG. 10B.
  • FIG. 10E is a cross-sectional structure diagram of the circuit board 12A when the adhesive receiving recess 13b is not provided.
  • FIG. 11 is a cross-sectional structure diagram of the circuit board 12B and the receptacle 22 of the optical transmission module according to the second modification.
  • FIG. 12A is an exploded perspective view of the receptacle 22A and the metal cap 20A of the optical transmission module according to the third modification.
  • FIG. 12B is a cross-sectional structure diagram of the receptacle 22A and the metal cap 20A.
  • FIG. 13 is an exploded perspective view of the optical transmission module 510 described in Patent Document 2.
  • the surface faces upward means that the normal vector of the surface has an upward component in addition to the normal vector of the surface being coincident with the upward direction.
  • the meanings of “face facing downward”, “face facing right”, “face facing left”, “face facing forward” and “face facing backward” are also The meaning is the same as “facing”.
  • facing means that the two surfaces come into contact with each other in addition to the two surfaces facing each other through a small gap.
  • the normal vector matches the right rear direction means that the normal vector is 45 ° in the right direction and the rear direction, and the normal vector is the right component and the rear direction. This includes having both directional components.
  • the meaning of “the normal vector matches the left front direction” is also the same as the meaning of “the normal vector matches the right rear direction”. Note that “the normal vector coincides with the right direction” means that the normal vector has only a component in the right direction.
  • FIG. 1A is a view of the optical transmission module 10 as viewed from above.
  • FIG. 1B is a cross-sectional structure diagram along AA in FIG. 1A.
  • FIG. 2 is an exploded perspective view of the light transmission module 10.
  • the normal direction of the main surface of the circuit board 12 of the optical transmission module 10 is defined as the vertical direction.
  • a direction from the plug 16 toward the receptacle 22 is defined as a front direction (an example of a connection direction), and a direction from the receptacle 22 toward the plug 16 is defined as a rear direction.
  • the direction in which the optical fibers 18a to 18d are arranged is defined as the left-right direction (an example of the first orthogonal direction).
  • the up-down direction (an example of the second orthogonal direction), the front-rear direction, and the left-right direction are orthogonal to each other.
  • the definition of an up-down direction, the front-back direction, and the left-right direction is an example.
  • the optical transmission module 10 includes a circuit board 12, a plug 16 (first connector), optical fibers 18a to 18d, a metal cap 20, and a receptacle 22 (second connector).
  • the light receiving element array 24 and the drive circuit 26 are provided.
  • the plug 16 and the receptacle 22 constitute the connector set 11.
  • the circuit board 12 is a plate-like member made of BT (Bismaleimide-Triazine) resin, ceramics, or the like. As shown in FIG. 1A, the shape of the circuit board 12 is a rectangular shape when viewed from above. Hereinafter, the main surface positioned on the upper side of the circuit board 12 is referred to as an upper surface, and the main surface positioned on the lower side of the circuit board 12 is referred to as a lower surface.
  • a surface mounting electrode (not shown) is provided on the lower surface of the circuit board 12 to be electrically connected to the land of the motherboard when the optical transmission module 10 is mounted on the motherboard.
  • Ground electrodes 80 and 82 are provided in the vicinity of the left rear corner and the right rear corner of the upper surface of the circuit board 12, respectively. The potentials of the ground electrodes 80 and 82 are kept at the ground potential.
  • the light receiving element array 24 is mounted on the circuit board 12 in the vicinity of the center of the upper surface of the circuit board 12.
  • the light receiving element array 24 is an element including a plurality (four in this embodiment) of photodiodes 24a to 24d for converting an optical signal into an electric signal.
  • the photodiodes 24a to 24d are arranged in a line in this order from the right side to the left side.
  • the drive circuit 26 is mounted on the upper surface of the circuit board 12. In the present embodiment, the drive circuit 26 is provided on the front side of the light receiving element array 24.
  • the drive circuit 26 includes a semiconductor circuit element for driving the light receiving element array 24.
  • the drive circuit 26 and the circuit board 12 are connected by wiring, wires, etc. arranged on the circuit board 12. As the material of the wire, for example, Au is used.
  • 3A and 3B are external perspective views of the receptacle 22.
  • the receptacle 22 is a rectangular parallelepiped transparent resin member as shown in FIGS. 3A and 3B.
  • the material of the receptacle 22 is, for example, an epoxy resin having translucency.
  • the receptacle 22 has an upper surface S21, a lower surface (an example of a bottom surface) S22, a rear surface S23, a front surface S24, a left surface S25, and a right surface S26.
  • the upper surface S21 is the surface of the receptacle 22 facing upward.
  • the lower surface S ⁇ b> 22 is a surface facing the circuit board 12 when the receptacle 22 is attached to the circuit board 12.
  • the receptacle 22 includes opposing surfaces S11 and S13, a passing surface S15, a total reflection surface 39, a lens array 41, and a positioning unit 100.
  • the opposing surfaces S11 and S13 are surfaces formed on the rear surface S23 by providing a notch.
  • the notch has a convex shape that penetrates the receptacle 22 in the vertical direction and faces from the rear side to the front side of the rear surface S23 when viewed from above.
  • the facing surface S11 (an example of the first facing surface) is a surface facing the left side.
  • the normal vector of the facing surface S11 matches the left direction.
  • the facing surface S13 (an example of a second facing surface) is a plane in which the distance from the facing surface S11 in the left-right direction is reduced toward the front side. Accordingly, the facing surface S13 is a surface facing the right side. In the present embodiment, the normal vector of the facing surface S13 coincides with the right rear direction.
  • the passage surface S15 (an example of a second passage surface) is a plane provided between the facing surface S11 and the facing surface S13 in the left-right direction, and is located on the front side of the facing surfaces S11 and S13.
  • the passage surface S15 is substantially orthogonal to the front-rear direction. Therefore, the normal vector of the passage surface S15 substantially matches the rear direction.
  • substantially orthogonal means that it is orthogonal and includes a state slightly deviated from orthogonality due to manufacturing variation.
  • the facing surfaces S11 and S13 are directly connected to both the upper surface S21 and the lower surface S22. Thereby, when viewed from above, a trapezoidal notch is provided on the rear side of the receptacle 22.
  • the total reflection surface 39 is included in the upper surface S21 and is a flat surface formed by a part of the upper surface S21 being depressed.
  • the total reflection surface 39 is located on the front side of the facing surface S13.
  • the normal vector of the total reflection surface 39 is directed upward and rearward, and forms an angle of 45 ° with respect to a plane parallel to the front-rear direction and the left-right direction.
  • the upper surface S21 further includes protrusions 47 and 48 and a recess 49.
  • the protrusions 47 and 48 are located on the left and right sides of the total reflection surface 39, respectively, and have a cylindrical shape protruding upward or a truncated cone shape protruding upward and becoming narrower toward the upper side. .
  • the concave portion 49 is a linear groove located on the front side of the total reflection surface 39 and extending in the left-right direction.
  • a recess 44 is provided in the lower surface S22.
  • the recess 44 is formed by recessing the portion excluding the outer edge of the lower surface S22 toward the upper side.
  • a notch 46 is provided on the front side of the lower surface S22. The recess 44 is connected to the outside through the notch 46.
  • the lens array 41 is included in the lower surface S22 and is located directly below the total reflection surface 39 on the inner surface of the recess 44.
  • the lens array 41 is formed by projecting a part of the lower surface S22 downward in a convex curved shape, and includes four lenses 41a to 41d.
  • the lenses 41a to 41d are arranged in a line in this order from the right side to the left side.
  • the front surface S24 includes two planes S24a and S24b.
  • the plane S24a is a rectangular plane extending in the left-right direction.
  • the normal vector of the plane S24a matches the forward direction.
  • the plane S24b is a rectangular plane connected to the left end of the plane S24a.
  • the normal vector of the plane S24b matches the left front direction.
  • the left surface S25 is a rectangular plane extending in the front-rear direction.
  • the normal vector of the left surface S25 coincides with the left direction.
  • the right surface S26 is a rectangular plane extending in the front-rear direction.
  • the normal vector of the right surface S26 coincides with the right direction.
  • the positioning part 100 (second positioning part) is a convex part that protrudes rearward from the passage surface S15.
  • the positioning unit 100 is disposed in a region overlapping the lenses 41a to 41d in the left-right direction when viewed from the rear side.
  • the positioning unit 100 is disposed at a position overlapping the center of the 41a to 41d in the left-right direction when viewed from the rear side.
  • the positioning part 100 is provided in the lower end of the passage surface S15 so that an optical path may be avoided.
  • the positioning part 100 has a shape that becomes thinner toward the front side, and in this embodiment, has a triangular prism shape.
  • the positioning unit 100 has a surface facing the lower side, a surface facing the upper right side, and a surface facing the upper left side.
  • the receptacle 22 as described above is attached on the upper surface of the circuit board 12 on which the light receiving element array 24 is mounted, as shown in FIGS. 1B and 2. More specifically, the receptacle 22 is placed on the circuit board 12 so that the light receiving element array 24 and the drive circuit 26 are accommodated in a space (hollow part) formed by the inner surface of the recess 44 and the upper surface of the circuit board 12. It is attached by. At this time, the receptacle 22 is positioned so that the focal points of the lenses 41a to 41d are positioned on the light receiving surfaces of the photodiodes 24a to 24d, respectively.
  • FIG. 4A is an external perspective view of the metal cap 20.
  • FIG. 4B is a bottom view of the metal cap 20.
  • the metal cap 20 is manufactured by bending a single metal plate (for example, SUS301), and includes an upper surface 50, a left surface 52, a right surface 54, fixing portions 56, 58, holding surfaces 59, 60, 62, and Connection portions 64 and 65 are included.
  • the upper surface 50 has a rectangular shape.
  • the left surface 52 has a rectangular shape and is bent from the left side of the upper surface 50 toward the lower side.
  • the right surface 54 has a rectangular shape and bends from the right side of the upper surface 50 downward. Thereby, the upper surface 50, the left surface 52, and the right surface 54 form an angular U-shape that opens downward when viewed from the front side.
  • the upper surface 50 is provided with a fixing piece 63 and holes 66 and 68.
  • the fixed piece 63 is a metal piece formed by forming a U-shaped slit on the upper surface 50.
  • the fixing piece 63 is slightly bent from the upper surface 50 to the lower side.
  • the hole 66 is an oval hole provided on the left front side of the fixed piece 63.
  • the longitudinal direction of the hole 66 is parallel to the left-right direction.
  • the hole 68 is a circular hole provided on the right front side of the fixed piece 63.
  • the fixing portion 56 extends from the rear end of the left surface 52 toward the rear side and is then bent toward the right front side. Further, the right front end portion of the fixing portion 56 is bent toward the left side.
  • the fixing portion 58 extends from the rear end of the right surface 54 toward the rear side and is then bent toward the left front side. Furthermore, the left front end portion of the fixing portion 58 is bent toward the right side.
  • the holding surface 59 protrudes from the rear side of the upper surface 50 toward the rear side, and has a rectangular shape.
  • the holding surface 60 bends from the left side of the holding surface 59 downward.
  • the holding surface 62 is bent from the right side of the holding surface 59 downward.
  • the holding surfaces 59, 60, 62 have an angular U-shape that opens downward when viewed from the front side.
  • the interval between the holding surface 60 and the holding surface 62 is smaller than the interval between the left surface 52 and the right surface 54.
  • the connecting portion 64 is connected to the rear side of the holding surface 60 and extends toward the left rear side.
  • the connecting portion 65 is connected to the rear side of the holding surface 62 and extends toward the right rear side.
  • the metal cap 20 configured as described above is attached on the upper surface of the circuit board 12 so as to cover the receptacle 22. Specifically, the protrusions 47 and 48 are inserted into the holes 66 and 68, respectively. Thereby, the upper surface 50 contacts the upper surface S21, the left surface 52 contacts the left surface S25, and the right surface 54 contacts the right surface S26. Furthermore, when viewed from the rear side, the facing surfaces S11 and S13 are located between the holding surface 60 and the holding surface 62.
  • the lower ends of the left surface 52 and the right surface 54 are fixed to the upper surface of the circuit board 12 with solder, an adhesive, or the like. Further, the connecting portions 64 and 65 are fixed to the ground electrodes 80 and 82 by being joined with solder, conductive adhesive or the like.
  • FIG. 6A is a view of the plug 16 as viewed from the front side.
  • FIG. 6B is a view of the plug 16 as viewed from the rear side.
  • the plug 16 is a rectangular parallelepiped transparent resin member as shown in FIGS. 5A, 5B, 6A and 6B.
  • a polyetherimide resin or a cycloolefin polymer resin can be used as the material of the plug 16.
  • the plug 16 includes side surfaces S1, S3, a passage surface S5, a lens array 38, and a positioning portion 102.
  • the passage surface S5 (an example of the first passage surface) is a part of the front surface of the plug 16, and is substantially orthogonal to the front-rear direction. Therefore, the normal vector of the passage surface S5 substantially matches the forward direction. Further, the passage surface S5 and the passage surface S15 face each other when the plug 16 and the receptacle 22 are connected. However, the passage surface S5 and the passage surface S15 are not in contact, and a slight gap exists between the passage surface S5 and the passage surface S15.
  • Side surface S1 (an example of the first side surface) is located on the right side and the rear side of passage surface S5 and occupies the vicinity of the front end of the right surface of plug 16.
  • the side surface S1 is a plane facing the right side. In the present embodiment, the normal vector of the side surface S1 coincides with the right direction. Further, the side surface S1 and the facing surface S11 face each other when the plug 16 and the receptacle 22 are connected. However, the side surface S1 and the facing surface S11 are not in contact with each other, and there is a slight gap between the side surface 1 and the facing surface S11.
  • the side surface S3 (an example of the second side surface) is located on the left side and the rear side of the passage surface S5 and occupies the vicinity of the front end of the left surface of the plug 16.
  • the side surface S3 is a plane in which the distance from the side surface S1 in the left-right direction becomes smaller toward the front side. Therefore, the side surface S3 is a plane facing the left side.
  • the normal vector of the side surface S3 matches the left front direction.
  • the side surface S3 and the facing surface S13 face each other when the plug 16 and the receptacle 22 are connected. However, the side surface S3 and the facing surface S13 are not in contact, and there is a slight gap between the side surface S3 and the facing surface S13.
  • the lens array 38 is provided on the passage surface S5 of the plug 16, and is formed by projecting a part of the passage surface S5 to the front side in a convex curved shape.
  • the lens array 38 includes four lenses 38a to 38d.
  • the lenses 38a to 38d are arranged in a line in this order from the right side to the left side.
  • a recess 40 is provided on the left surface of the plug 16.
  • a recess 42 is provided on the right surface of the plug 16.
  • recesses 32 and 34 are provided on the upper surface of the plug 16.
  • the recess 34 is provided in the vicinity of the front side of the upper surface of the plug 16 and is a recess having a rectangular shape when viewed from above.
  • the recess 32 is located behind the recess 34, and is a recess having a rectangular shape when viewed from above.
  • the recess 32 reaches the rear surface of the plug 16. Therefore, a part of the rear surface of the plug 16 is cut away.
  • the plug 16 is provided with a plurality of (four in this embodiment) holes 36a to 36d that connect the recess 32 and the recess 34.
  • the holes 36a to 36d are arranged in a line in this order from the right side to the left side.
  • the holes 36a to 36d overlap with the lenses 38a to 38d, respectively, when viewed from the rear side.
  • the positioning portion 102 (first positioning portion) is a recess that is recessed from the front surface of the plug 16 toward the rear side.
  • the positioning portion 102 is disposed between the side surface S1 and the side surface S3 in the left-right direction when viewed from the front side.
  • the positioning portion 102 is disposed in a region overlapping with the front ends of the lenses 41a to 41d and the optical fibers 18a to 18d in the left-right direction when viewed from the front side.
  • the positioning unit 102 is disposed at a position overlapping the center of the lenses 41a to 41d and the center of the optical fibers 18a to 18d in the left-right direction when viewed from the front side.
  • the positioning part 102 is provided in the lower end of the front surface of the plug 16 so that an optical path may be avoided.
  • the inner surface of the positioning unit 102 has a shape that follows the outer peripheral surface of the positioning unit 100. Therefore, the positioning unit 102 has a surface facing the lower right side and a surface facing the lower left side. However, the positioning portion 102 is provided at the lower end of the front surface of the plug 16. Therefore, the positioning part 102 opens toward the lower side.
  • the optical fibers 18a to 18d are each composed of a core wire and a covering material covering the core wire.
  • the core wire includes a core and a clad made of a resin such as a fluorine resin.
  • the covering material is made of a resin such as a polyethylene resin. As shown in FIG. 2, the coating material is removed and the core wire is exposed near the tips of the optical fibers 18a to 18d.
  • portions where the core wire is exposed are referred to as exposed portions 19a to 19d.
  • portions where the core wire is covered with the covering material are referred to as covering portions 21a to 21d.
  • the exposed portions 19a to 19d are inserted into the holes 36a to 36d from the rear side.
  • the tips of the four exposed portions 19a to 19d are positioned directly behind the lenses 38a to 38d in the recess 34, respectively.
  • the optical axis of the light emitted from the tip surfaces of the exposed portions 19a to 19d is parallel to the front-rear direction.
  • a resin having translucency is injected into the recesses 32 and 34.
  • the optical fibers 18a to 18d are fixed in the recesses 32 and 34 by a transparent acrylic resin or the like.
  • the optical fibers 18a to 18d are fixed to the plug 16. That is, the plug 16 is provided at the tip of the optical fibers 18a to 18d.
  • the plug 16 configured as described above is connected to the receptacle 22. Specifically, the plug 16 is inserted into the space surrounded by the holding surfaces 59, 60, 62 and the circuit board 12 from the rear side.
  • the positioning unit 100 enters the positioning unit 102.
  • the inner surface of the positioning unit 102 has a shape that follows the outer peripheral surface of the positioning unit 100. Therefore, the outer peripheral surface of the positioning unit 100 and the outer peripheral surface of the positioning unit 102 are in contact with each other. At this time, the inner surface of the positioning unit 102 contacts the outer peripheral surface of the positioning unit 100 from both sides in the left-right direction. As a result, the plug 16 and the receptacle 22 are positioned in the left-right direction.
  • the fixing portions 56 and 58 are respectively caught in the concave portions 40 and 42 of the plug 16, and the fixing piece 63 is caught in the concave portion 49 in the middle portion in the front-rear direction of the plug 16.
  • the plug 16 is fixed to the receptacle 22.
  • the positioning portion 102 is disposed between the side surface S1 and the side surface S3 in the left-right direction
  • the positioning portion 100 is also disposed between the side surface S1 and the side surface S3 in the left-right direction.
  • the positioning portion 102 is disposed in a region overlapping with the tips of the optical fibers 18a to 18d in the left-right direction
  • the positioning portion 100 is also disposed in a region overlapping with the tips of the optical fibers 18a to 18d in the left-right direction.
  • the positioning unit 102 is disposed at a position that overlaps the center of the tip of the optical fibers 18a to 18d in the left-right direction, so the positioning unit 100 also overlaps the center of the tip of the optical fibers 18a to 18d in the left-right direction. Will be placed in position.
  • the tips of the optical fibers 18a to 18d are optically coupled to the light receiving surfaces of the photodiodes 24a to 24d, respectively.
  • a plurality of lights emitted from the tips of the optical fibers 18a to 18d travel toward the front side and enter the lenses 38a to 38d.
  • the lenses 38a to 38d collimate the light so as to be close to parallel light. Thereby, the light passes through the passage surface S5. Thereafter, the light enters the plug 16 from the passage surface S15. Thereby, the light passes through the passage surface S15.
  • a total reflection surface 39 that changes the traveling direction of light is provided on the front side of the passage surface S15. Specifically, the light traveling toward the front side is reflected by the total reflection surface 39, travels toward the lower side, and enters the lenses 41a to 41d.
  • the lenses 41a to 41d collect the light on the photodiodes 24a to 24d. Thus, each of the photodiodes 24a to 24d receives light and generates an electrical signal.
  • a light emitting element array including four light emitting diodes may be used. In this case, the light emitted from the four light emitting diodes on the substrate passes through the lenses 41a to 41d, is reflected by the total reflection surface 39, and passes through the passage surface S15.
  • the light passes through the passage surface S5 and is collected at the tips of the optical fibers 18a to 18d by the lenses 38a to 38d.
  • the passing surfaces S5 and S15 are surfaces through which light incident on the optical fibers 18a to 18d passes.
  • the accuracy of optical coupling between the optical fibers 18a to 18d and the photodiodes 24a to 24d can be increased. More specifically, in the connector set 11, the positioning portions 100 and 102 are disposed between the side surface S1 and the side surface S3 in the left-right direction. As a result, the distance between the positioning portions 100 and 102 and the tips of the optical fibers 18a to 18d in the left-right direction is reduced. As a result, the positioning accuracy between the tips of the optical fibers 18a to 18d and the photodiodes 24a to 24d is improved. That is, the accuracy of optical coupling between the optical fibers 18a to 18d and the photodiodes 24a to 24d can be increased.
  • the accuracy of optical coupling between the optical fibers 18a to 18d and the photodiodes 24a to 24d can be effectively increased. More specifically, the positioning portions 100 and 102 are disposed in a region overlapping with the tips of the optical fibers 18a to 18d in the left-right direction. As a result, the distance between the positioning portions 100 and 102 and the tips of the optical fibers 18a to 18d in the left-right direction is further reduced. As a result, the positioning accuracy between the tips of the optical fibers 18a to 18d and the photodiodes 24a to 24d is further improved. That is, the accuracy of optical coupling between the optical fibers 18a to 18d and the photodiodes 24a to 24d can be increased.
  • the connector set 11 it is possible to suppress the occurrence of optical fibers and photodiodes having low positioning accuracy in the optical fibers 18a to 18d and the photodiodes 24a to 24d.
  • the positioning parts 100 and 102 are arranged in a region overlapping with the tips of the optical fibers 18a to 18d in the left-right direction.
  • the optical fibers 18a to 18d farthest from the positioning portions 100 and 102 in the left-right direction are the optical fiber 18a or the optical fiber 18d.
  • the case where the optical fibers 18a to 18d farthest from the positioning portions 100 and 102 in the left-right direction are the optical fibers 18a will be described as an example.
  • the positioning accuracy between the optical fiber 18a and the photodiode 24a is lower than the positioning accuracy between the other optical fibers 18b to 18d and the photodiodes 24b to 24d. Therefore, if the distance between the positioning portions 100 and 102 and the optical fiber 18a in the left-right direction is reduced, the occurrence of optical fibers 18a to 18d and photodiodes 24a to 24d with low positioning accuracy can be suppressed. Therefore, in the connector set 11, the positioning portions 100 and 102 are arranged at positions that overlap with the center in the left-right direction of the tips of the optical fibers 18a to 18d in the left-right direction.
  • the distance from the positioning parts 100, 102 in the left-right direction to the optical fiber 18a is equal to the distance from the positioning parts 100, 102 in the left-right direction to the optical fiber 18d.
  • the distance from the positioning portions 100 and 102 to the optical fiber 18a in the left-right direction is the minimum value.
  • the receptacle 22 remove
  • the receptacle 22 When the pressure in the hollow portion increases, the receptacle 22 tends to come off the circuit board 12. Therefore, the receptacle 22 is provided with a notch 46 that is a through hole that connects the recess 44 and the outside. By this notch 46, an increase in pressure in the hollow portion is suppressed. As a result, the receptacle 22 is suppressed from being detached from the circuit board 12.
  • the receptacle 22 it is suppressed that the Au wire which connects the drive circuit 26 and the circuit board 12 is disconnected in a thermal shock test. More specifically, in an optical transmission module using a general receptacle, the circuit board and the drive circuit are connected by an Au wire. Furthermore, the drive circuit is covered and sealed with a translucent epoxy resin or the like. Since the circuit board, the Au wire, the epoxy resin, and the drive circuit are made of different materials, they have different linear expansion coefficients. Therefore, in the optical transmission module using the conventional receptacle, there is a possibility that the Au wire is loaded and disconnected in the thermal shock test.
  • the drive circuit 26 is not sealed with resin. Specifically, an Au wire is disposed in a space provided by the recess 44 of the receptacle 22. Therefore, in the optical transmission module 10, compared to a general optical transmission module in which an Au wire is resin-sealed, an Au wire (not shown) that connects the drive circuit 26 and the circuit board 12 in a thermal shock test is used. Such thermal stress load is small. As a result, in the optical transmission module 10, disconnection of the Au wire connecting the drive circuit 26 and the circuit board 12 in the thermal shock test is suppressed.
  • the structure of the receptacle 22 can be simplified. More specifically, in the optical transmission module 10, the guide surface of the plug 16 is formed by the holding surfaces 59, 60, 62 of the metal cap 20. Therefore, the receptacle 22 does not need to be provided with a rail for guiding the plug 16 insertion / removal operation. As a result, the structure of the receptacle 22 is simplified.
  • the plug 16 is prevented from being easily detached from the receptacle 22. More specifically, in the optical transmission module 10, the fixing portions 56 and 58 are caught in the recesses 40 and 42, respectively.
  • the plug 16 and the receptacle 22 are connected, the right and left ends of the fixing portions 56 and 58 are pressed against the left and right surfaces of the plug 16, respectively, so that the fixing portions 56 and 58 are elastically deformed into a warped shape. To do.
  • the fixing portions 56 and 58 reach the recesses 40 and 42, respectively, the fixing portions 56 and 58 are restored to the original state, and the fixing portions 56 and 58 are caught by the recesses 40 and 42.
  • the fixing portions 56 and 58 are relatively long, they can be greatly elastically deformed. Therefore, even when the protruding amount to the right side of the fixing portion 56 and the protruding amount to the left side of the fixing portion 58 are increased, the shape in which the fixing portions 56 and 58 are warped when the plug 16 and the receptacle 22 are connected. Can be sufficiently elastically deformed. Therefore, the recesses 40 and 42 of the plug 16 can be deepened. As a result, the fixing portions 56 and 58 can be firmly hooked by the concave portions 40 and 42. As a result, the plug 16 is prevented from being easily detached from the receptacle 22.
  • the metal cap 20 is suppressed from being plastically deformed. More specifically, the connection portions 64 and 65 are connected to the rear sides of the holding surfaces 60 and 62 and are fixed to the ground electrodes 80 and 82 of the circuit board 12. Therefore, when the plug 16 and the receptacle 22 are connected, the connecting portions 64 and 65 prevent the holding surfaces 60 and 62 from being greatly deformed by the contact of the plug 16. As a result, plastic deformation of the metal cap 20 is suppressed.
  • the metal cap 20 is prevented from being detached from the circuit board 12. More specifically, the fixing piece 63 is in pressure contact with the upper surface of the plug 16. When the plug 16 is fixed to the receptacle 22 only by such a fixing piece 63, the fixing piece 63 needs to be pressed against the plug 16 with a large force. However, in this case, a large force is applied between the circuit board 12 and the metal cap 20, and the metal cap 20 may be detached from the circuit board 12.
  • the fixing portions 56 and 58 hold the plug 16 in the receptacle 22 by sandwiching the plug 16 from the left and right sides. In the holding by the fixing portions 56 and 58, a large force is not applied between the circuit board 12 and the metal cap 20. As a result, the metal cap 20 is prevented from being detached from the circuit board 12.
  • the optical transmission module 10 since the lower end of the metal cap 20 is aligned, it can be easily mounted on the circuit board 12.
  • FIG. 7 is a configuration diagram of the connector set 11a.
  • the connector set 11 a is different from the connector set 11 in the structure of the positioning portions 100 and 102.
  • the positioning part 100 is a recessed part
  • the positioning part 102 is a convex part. Even in such a connector set 11a, the same effects as the connector set 11 can be obtained.
  • FIG. 8 is a configuration diagram of the connector set 11b.
  • the connector set 11 b is different from the connector set 11 in the structure of the plug 16 and the receptacle 22. More specifically, the plug 16 (an example of the second connector) of the connector set 11b has the structure of the receptacle 22 of the connector set 11, and the receptacle 22 (an example of the first connector) of the connector set 11b is The structure of the plug 16 of the connector set 11 is provided. Thus, the structure of the receptacle and the structure of the plug may be interchanged. Even in such a connector set 11b, the same effects as the connector set 11 can be obtained.
  • FIG. 9 is a configuration diagram of the connector set 11c.
  • the connector set 11c is different from the connector set 11b in the structure of the positioning portions 100 and 102. More specifically, in the connector set 11c, the positioning part 100 is a concave part and the positioning part 102 is a convex part. Also in such a connector set 11c, the same effect as the connector set 11 can be show
  • the connector set according to the present invention is not limited to the connector sets 11 and 11a to 11c according to the above embodiment, and can be changed within the scope of the gist thereof.
  • side surfaces S1, S3 and the opposing surfaces S11, S13 may be curved surfaces instead of flat surfaces.
  • the configuration of the optical transmission module according to the first modification will be described below with reference to the drawings.
  • the optical transmission module according to the first modification is different from the optical transmission module 10 in that a circuit board 12A is provided instead of the circuit board 12.
  • FIG. 10A is a perspective view of the circuit board 12A.
  • the circuit board 12A is provided with a ventilation recess (an example of a substrate first recess) 13a and an adhesive receiving recess 13b (an example of a substrate second recess) on an upper surface (an example of a first main surface) S31.
  • FIG. 10A shows an area (hereinafter referred to as an adhesive arrangement area) 14 in which an adhesive for fixing the receptacle 22 to the circuit board 12A is arranged.
  • the ventilation recess 13 a is provided so as to cross the front portion of the adhesive placement region 14.
  • the adhesive receiving recess 13 b extends along the rear part of the adhesive placement region 14.
  • FIG. 10B is a plan view of the circuit board 12A and the receptacle 22 of the optical transmission module according to the first modification as viewed from above.
  • the receptacle 22 is not provided with a notch 46 (see FIG. 3B).
  • the hollow portion 15 is constituted by the inner surface of the recess 44 (see FIG. 3B) of the receptacle 22 and the upper surface S31 of the circuit board 12A.
  • the ventilation recess 13 a is connected to the hollow portion 15 and to the outside of the receptacle 22.
  • FIG. 10C is a sectional structural view of the vicinity of the ventilation recess 13a in BB of FIG. 10B.
  • the upper surface S31 of the circuit board 12A and the lower surface S22 of the receptacle 22 (portion other than the recess 44) are fixed by an adhesive G.
  • the adhesive G does not exist in the ventilation recess 13a, or even if it exists, the ventilation recess 13a is not filled.
  • gas for example, air
  • gas_flowing can distribute
  • the adhesive receiving recess 13 b extends along the outer edge of the receptacle 22. More specifically, the adhesive receiving recess 13b extends along the facing surface S11, the passage surface S15, and the facing surface S13.
  • the facing surface S11, the passage surface S15, and the facing surface S13 are collectively referred to as a connection surface Sc.
  • the adhesive receiving recess 13b overlaps the entire connection surface Sc. That is, as viewed from above, the entire connection surface Sc is included in the region of the adhesive receiving recess 13b.
  • FIG. 10D is a cross-sectional structure diagram in the vicinity of the adhesive receiving recess 13b in CC of FIG. 10B.
  • a part of the adhesive G protrudes from between the lower surface S22 of the receptacle 22 and the upper surface S31 of the circuit board 12A.
  • a part of the protruding adhesive G enters the adhesive receiving recess 13b.
  • FIG. 10E is a cross-sectional structure diagram of the receptacle 22 and the circuit board 12A when the adhesive receiving recess 13b is not provided.
  • the cross section of FIG. 10E corresponds to the cross section of FIG. 10D.
  • the fillet F that covers the vicinity of the lower end of the passage surface S15 is formed by the adhesive G protruding from between the lower surface S22 of the receptacle 22 and the upper surface S31 of the circuit board 12A.
  • the plug 16 can interfere with the fillet F when connecting the plug 16 to the receptacle 22.
  • the optical axis of the plug 16 and the optical axis of the receptacle 22 may deviate, resulting in poor characteristics as an optical transmission module.
  • a plurality of adhesive receiving recesses 13b may be provided on the upper surface S31 of the circuit board 12A.
  • the adhesive receiving recess 13b may extend along a part of the connection surface Sc.
  • the part of the connection surface Sc may be any one or two of the whole or part of the facing surface S11, the whole or part of the passing surface S15, and the whole or part of the facing surface S13.
  • the adhesive G easily protrudes in a portion adjacent to the connection surface Sc. You may provide the adhesive receiving recessed part 13b along only a part.
  • the adhesive receiving recess 13b is an outer edge of the receptacle 22 and a portion other than the connection surface Sc (hereinafter, referred to as “the portion along the connection surface Sc”). (Referred to as non-connected outer edge).
  • the adhesive receiving recess 13b may be provided along the entire non-connected outer edge or may be provided along a part of the non-connected outer edge.
  • the adhesive receiving recess 13b is provided along the non-connection outer edge, the adhesive G protruding from the non-connection outer edge when viewed from above can be accommodated in the adhesive receiving recess 13b. Thereby, the situation in which the metal cap 20 interferes with the adhesive G (adhesive other than the adhesive for fixing the metal cap 20 to the circuit board 12A) and the connection failure of the metal cap 20 occurs can be avoided.
  • the configuration of the optical transmission module according to the second modification will be described below with reference to the drawings.
  • the optical transmission module according to the second modification is different from the optical transmission module according to the first modification in that a circuit board 12B is provided instead of the circuit board 12A.
  • FIG. 11 is a cross-sectional structure diagram of the circuit board 12B and the receptacle 22.
  • the cross section of FIG. 11 corresponds to the cross section of FIG. 10C.
  • the circuit board 12B is not provided with the recess 13a for ventilation, while the circuit board 12A is provided with a pair of protrusions (an example of a protruding part) 13c substantially parallel to each other on the upper surface S31. Is different.
  • the ridge 13c protrudes from the upper surface S31.
  • the pair of ridges 13c are provided so as to cross the front portion of the adhesive placement region 14 in the same manner as the ventilation recess 13a (see FIG. 10B) of the circuit board 12A.
  • a ventilation space 13d which is a space between the pair of ridges 13c, is connected to the hollow portion 15 and to the outside of the receptacle 22.
  • the upper surface S31 of the circuit board 12A and the lower surface S22 of the receptacle 22 are fixed by an adhesive G at a portion other than the ventilation space 13d.
  • the adhesive G does not exist in the ventilation space 13d.
  • gas for example, air
  • the pair of ridges 13c may be connected by a protruding portion from the upper surface S31.
  • the connected protrusion 13c may have a rectangular shape as a whole, for example.
  • the configuration of the optical transmission module according to the third modification will be described below with reference to the drawings.
  • the optical transmission module according to the third modified example is different from the optical transmission module 10 in that a receptacle 22A and a metal cap 20A are provided instead of the receptacle 22 and the metal cap 20, respectively.
  • FIG. 12A is an exploded perspective view of the receptacle 22A and the metal cap 20A in the optical transmission module according to the third modification.
  • the receptacle 22A is different from the receptacle 22 in that fixing protrusions (an example of protrusions) 47A and 48A are provided on the upper surface S21.
  • the fixing protrusions 47A and 48A have a columnar shape protruding upward.
  • the fixing protrusion 47 A is provided on the rear side of the protrusion 47
  • the fixing protrusion 48 A is provided on the rear side of the protrusion 48.
  • the metal cap 20A is different from the metal cap 20 in that fixing holes (an example of holes) 66A and 68A are provided on the upper surface 50.
  • fixing holes an example of holes
  • the fixing hole 66 ⁇ / b> A is provided on the rear side of the hole 66
  • the fixing hole 68 ⁇ / b> A is provided on the rear side of the hole 68.
  • FIG. 12B is a cross-sectional view of the receptacle 22A and the metal cap 20A.
  • FIG. 12B shows a cross section perpendicular to the front-rear direction and passing through the fixing protrusion 47A and the fixing hole 66A.
  • the fixing protrusion 47A is inserted through the fixing hole 66A.
  • the fixing hole 66A is larger than the fixing protrusion 47A.
  • a gap is formed between the fixing protrusion 47A and the fixing hole 66A.
  • An adhesive GA is provided so as to cover the inner surface of the fixing hole 66A, the periphery of the fixing hole 66A, and the fixing protrusion 47A.
  • a gap between the fixing protrusion 47A and the fixing hole 66A is filled with an adhesive GA.
  • the fixing protrusion 48A and the fixing hole 68A are configured similarly to the fixing protrusion 47A and the fixing hole 66A. That is, the fixing protrusion 48A is inserted into the fixing hole 68A. When viewed from above, the fixing hole 68A is larger than the fixing protrusion 48A. A gap is formed between the fixing protrusion 48A and the fixing hole 68A. A gap between the fixing protrusion 48A and the fixing hole 68A is filled with an adhesive GA. An adhesive GA is provided so as to cover the inner surface of the fixing hole 68A, the periphery of the fixing hole 68A, and the fixing protrusion 48A. A gap between the fixing protrusion 48A and the fixing hole 68A is filled with an adhesive GA.
  • the adhesive GA is provided on the metal cap 20A so that the height from the metal cap 20A is higher than when the fixing protrusions 47A and 48A are not provided. Can do. Thereby, the joining strength of the metal cap 20A to the receptacle 22A can be increased.
  • optical transmission module 10 the optical transmission module provided with the connector set according to the first to third modifications, and the optical transmission module according to the first to third modifications may be arbitrarily combined.
  • the present invention is useful for a connector set and an optical transmission module, and is particularly excellent in that the accuracy of optical coupling between an optical fiber and an optical element can be increased.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Couplings Of Light Guides (AREA)

Abstract

La présente invention augmente la précision d'une liaison optique entre une fibre optique et un élément optique. Cet ensemble connecteur comprend un premier connecteur et un second connecteur. Le premier connecteur comprend une première surface transmissive qui transmet la lumière émise par une pluralité de fibres optiques ou la lumière entrant dans une pluralité de fibres optiques, une première surface latérale orientée dans un sens dans une première direction orthogonale, une seconde surface latérale orientée dans un autre sens dans la première direction orthogonale, et une première partie de positionnement Le second connecteur comprend une seconde surface transmissive qui fait face à la première surface transmissive et transmet la lumière émise par une pluralité de fibres optiques ou la lumière entrant dans une pluralité de fibres optiques, une première surface de face se trouvant en regard de la première surface latérale, une seconde surface de face se trouvant en regard de la seconde surface latérale, et une seconde partie de positionnement La première partie de positionnement et la seconde partie de positionnement positionnent le premier connecteur et le second connecteur par rapport à la première direction orthogonale, et sont disposées entre la première surface latérale et la seconde surface latérale par rapport à la première direction orthogonale.
PCT/JP2017/044563 2016-12-13 2017-12-12 Ensemble connecteur et module de transmission optique WO2018110548A1 (fr)

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JP2016-241122 2016-12-13
JP2016241122 2016-12-13

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009122197A (ja) * 2007-11-12 2009-06-04 Fujikura Ltd 光コネクタの位置決め構造
JP2009169211A (ja) * 2008-01-18 2009-07-30 Epson Toyocom Corp 偏光変換素子および偏光変換素子の製造方法
US20150125118A1 (en) * 2012-06-12 2015-05-07 FCI Asia Pte Ltd. Connector Assembly
JP2016139041A (ja) * 2015-01-28 2016-08-04 株式会社村田製作所 レセプタクル
WO2016121177A1 (fr) * 2015-01-30 2016-08-04 株式会社村田製作所 Socle, ensemble connecteur, et procédé de fabrication de socle

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009122197A (ja) * 2007-11-12 2009-06-04 Fujikura Ltd 光コネクタの位置決め構造
JP2009169211A (ja) * 2008-01-18 2009-07-30 Epson Toyocom Corp 偏光変換素子および偏光変換素子の製造方法
US20150125118A1 (en) * 2012-06-12 2015-05-07 FCI Asia Pte Ltd. Connector Assembly
JP2016139041A (ja) * 2015-01-28 2016-08-04 株式会社村田製作所 レセプタクル
WO2016121177A1 (fr) * 2015-01-30 2016-08-04 株式会社村田製作所 Socle, ensemble connecteur, et procédé de fabrication de socle

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