TWI483022B - Positioning components, sockets and optical transmission modules - Google Patents

Description

Positioning member, socket and optical transmission module

The present invention relates to a positioning member for optically coupling an optical fiber to an optical element, a socket including the positioning member, and an optical transmission module, and more particularly to an optical fiber for setting the plug at one end and the optical substrate disposed on the mounting substrate. A positioning member optically coupled to the optical element, a socket including the positioning member, and an optical transmission module.

As a positioning member for optically coupling an optical fiber to an optical element, for example, a socket for an optical connector described in Patent Document 1 is known. Such an optical connector slot 500 is placed on the optical element 504 so as to cover the optical element 504 as shown in FIG. Further, when the optical connector (plug of the present invention) 514 provided at the end of the optical fiber 510 is attached to the optical connector slot 500, the optical connector 514 is further mounted on the optical connector slot 500.

As described above, the socket of the optical connector slot 500 described in Patent Document 1 is configured such that the optical connector slot 500 is placed on the optical element 504 and the optical connector 514 is placed thereon. Here, in order to reduce the height of the optical connector 514 itself, in order to reduce the height of the optical connector 514, it is not possible to have a height equal to or lower than the height of the optical connector 514. In the module using the socket for an optical connector described in Patent Document 1, it is difficult to ensure the strength of the optical connector 514 and at the same time reduce the height.

Patent Document 1: Japanese Laid-Open Patent Publication No. 2009-276477

Accordingly, an object of the present invention is to provide a positioning member capable of securing a strength of a plug provided at one end of an optical fiber and at the same time reducing the height of a socket to which the plug is connected, a socket including the positioning member, and an optical transmission module.

A positioning member according to an aspect of the present invention is characterized in that an optical fiber having a plug at an end portion is optically coupled to an optical element provided on an upper surface of the mounting substrate, and is characterized in that: a plug mounting portion is provided on the mounting substrate The upper surface is mounted with the plug; and the optical coupling portion is disposed on the structure substrate with the optical element interposed therebetween, and the optical axis of the optical fiber is aligned with the optical axis of the optical element by reflection.

A socket according to an aspect of the present invention includes: a plurality of the positioning members; a plurality of the optical elements; and the mounting substrate; the positioning members are respectively provided for the respective optical elements.

An optical transmission module according to an aspect of the present invention includes: the positioning member; the optical element; the mounting substrate; the optical fiber; and the plug.

In the positioning member according to the aspect of the invention, the socket and the optical transmission module including the positioning member, the plug mounting portion of the positioning member is provided on the upper surface of the mounting substrate together with the optical element. In other words, the plug mounting portion of the positioning member is not the optical connector slot 500 described in Patent Document 1. Generally, it is disposed above the optical element, but is disposed on the same surface as the optical element. Therefore, the height of the socket and the optical transmission module having the positioning member according to the aspect of the present invention does not lower the height of the plug itself, that is, the optical connector can be used in a state where the strength of the plug is ensured. The socket of the slot 500 and the optical transmission module are low.

According to the positioning member, the socket, and the optical transmission module of one aspect of the present invention, the strength of the plug provided at one end of the optical fiber can be ensured, and at the same time, the height of the socket or the optical module to which the plug is connected can be lowered.

G1, G2, G3, G4‧‧‧ slots

H1~h6‧‧‧height

10,10A‧‧‧Optical transmission module

20,20A‧‧‧ socket

40‧‧‧ plug

50‧‧‧Light-receiving element array (optical component)

60‧‧‧ fiber

100‧‧‧Lighting element array (optical components)

200,200A,200B‧‧‧ positioning member

222, 242 ‧ ‧ plug placement

224,244‧‧‧Photocoupler

Fig. 1 is a perspective view showing the appearance of an optical transmission module having a positioning member according to an embodiment.

Figure 2 is an exploded perspective view of the socket.

Figure 3 is an external perspective view of the metal cover and the positioning member removed from the socket.

Fig. 4 is an external perspective view showing a state in which a metal cover is removed from a socket.

Fig. 5 is a perspective view showing the appearance of a positioning member.

Fig. 6 is a plan view of the positioning member taken from the negative side in the z-axis direction.

Fig. 7 is a view showing a C-C or D-D cross-section additional structure substrate and a plug of the positioning member shown in Fig. 5.

Fig. 8 is a perspective view showing the appearance of a metal cover.

Fig. 9 is a perspective view showing the appearance of an optical fiber connecting member.

Fig. 10 is a plan view of the plug from the negative side in the z-axis direction.

Figure 11 is a diagram of the process of the socket.

Fig. 12 is a cross-sectional view showing a positioning member of a first modification.

Fig. 13 is a perspective view showing the appearance of a positioning member according to a second modification.

Fig. 14 is a perspective view showing the appearance of a plug placed on the positioning member of the second modification.

FIG. 15 is a cross-sectional view of the optical connector slot of the same type as the optical connector slot described in Patent Document 1.

Hereinafter, an optical transmission module including a positioning member according to an embodiment and a method of manufacturing the same will be described.

(The structure of the optical transmission module, see Fig. 1 to Fig. 3)

Hereinafter, a configuration of an optical transmission module including a positioning member according to an embodiment will be described with reference to the drawings. Further, the upper and lower directions of the optical transmission module 10 are defined as the z-axis direction, and the direction along the long side of the optical transmission module 10 when viewed from the z-axis direction is defined as the x-axis direction. Furthermore, the direction along the short side of the light transmission module 10 is defined as the y-axis direction. The x-axis, the y-axis, and the z-axis are orthogonal to each other.

As shown in FIG. 1, the optical transmission module 10 includes a socket 20 and an optical fiber connecting element 70.

As shown in FIG. 2, the socket 20 includes a metal cover 30, a light receiving element array 50, a light emitting element array 100, a positioning member 200, a build substrate 22, a sealing resin 24, and a drive circuit 26.

As shown in FIG. 3, the package substrate 22 has a rectangular shape when viewed in plan from the z-axis direction. Further, a surface on the negative side in the z-axis direction of the package substrate 22 (hereinafter referred to as a lower surface) is provided with a surface mount which is in contact with the pads of the circuit board when the optical transfer module 10 is mounted on the circuit board. Electrode E1 (not shown in Fig. 3) is used.

The surface on the positive side in the z-axis direction of the package substrate 22 (hereinafter, referred to as the above table) In the vicinity of the corner formed by the side L1 on the negative side in the x-axis direction and the side L2 on the negative side in the y-axis direction, a ground conductor partially exposed in one of the ground conductors in the package substrate 22 is provided. The portion E2 is exposed. The ground conductor exposed portion E2 has a rectangular shape having a long side in the x-axis direction when viewed from the positive side in the z-axis direction.

Further, the upper surface of the package substrate 22 is provided in the package substrate 22 in the vicinity of the corner formed by the side L1 on the negative side in the x-axis direction and the side L3 on the positive side in the y-axis direction. The ground conductor exposed portion E3 is partially exposed to one of the ground conductors. The ground conductor exposed portion E3 has a rectangular shape with a long side in the x-axis direction when viewed from the positive side in the z-axis direction.

The light-receiving element array 50 and the light-emitting element array 100 are provided on a portion of the upper surface of the upper surface of the package substrate 22 on the positive side in the x-axis direction. The light-receiving element array 50 is an element including a plurality of photodiodes that convert optical signals into electrical signals. The light emitting element array 100 is an element including a plurality of diodes that convert electrical signals into optical signals.

Further, the drive circuit 26 is provided on the positive side in the x-axis direction of the light-receiving element array 50 and the light-emitting element array 100 on the positive side in the x-axis direction of the surface of the package substrate 22. The drive circuit 26 is a semiconductor circuit element for driving the light-receiving element array 50 and the light-emitting element array 100.

Moreover, as shown in FIG. 3, the drive circuit 26 has a rectangular shape having a long side parallel to the y-axis direction when viewed in plan from the z-axis direction. The drive circuit 26 and the light-receiving element array 50 are connected by wire bonding through the lead wires U. Further, the drive circuit 26 and the light-emitting element array 100 are connected by wire bonding via the lead wires U. Thereby, the electrical signal from the driving circuit 26 is transmitted to the light emitting element array 100 through the lead U, and the electrical signal from the light receiving element array 50 is transmitted to the driving circuit 26 through the lead U. Moreover, the driving circuit 26 and the package substrate 22 are connected by the lead wires through the leads Connected.

As shown in FIG. 3, the sealing resin 24 is provided with a sealing portion 24a and leg portions 24b to 24e, and is made of a transparent resin such as epoxy resin. The sealing portion 24a has a substantially rectangular parallelepiped shape and is provided on a portion of the upper surface of the mounting substrate 22 on the positive side in the x-axis direction. Further, the sealing portion 24a covers the light receiving element array 50, the light emitting element array 100, and the drive circuit 26.

The leg portions 24b and 24c are arranged at intervals from the negative side to the positive side in the x-axis direction. The leg portions 24b and 24c are rectangular parallelepiped members that protrude from the surface on the negative side in the y-axis direction of the sealing portion 24a toward the side L2 of the package substrate 22. Further, a space H1 in which the convex portion C3 of the metal cover 30 to be described later is fitted is provided between the leg portion 24b and the leg portion 24c.

The leg portions 24d, 24e are arranged at intervals from the negative side to the positive side in the x-axis direction. The leg portions 24d and 24e are members having a rectangular parallelepiped shape that protrudes from the surface on the positive side in the y-axis direction of the sealing portion 24a toward the side L3 of the package substrate 22. Further, a space H2 in which the convex portion C6 of the metal cover 30 to be described later is fitted is provided between the leg portion 24d and the leg portion 24e.

(Configuration of positioning member, see Figures 4 to 7)

Next, the positioning member 200 will be described with reference to the drawings.

As shown in FIG. 4, the positioning member 200 is provided over the entire surface of the mounting substrate 22 and the sealing resin 24 so as to straddle the mounting substrate 22 and the sealing resin 24. Further, the positioning member 200 includes a positioning member 220 for a light-emitting element and a positioning member 240 for a light-receiving element. That is, the positioning members 220, 240 are respectively disposed for the respective optical elements. The positioning members 220 and 240 are disposed to be sequentially arranged from the negative side to the positive side in the y-axis direction. Further, the positioning member 200 is made of, for example, an epoxy-based or an anti-loning resin.

The positioning member 220 for a light-emitting element has a rectangular shape when viewed in plan from the z-axis direction. Further, as shown in FIG. 5, the positioning member 220 includes a plug mounting portion 222 and a light coupling portion 224.

The plug mounting portion 222 is a portion on which the plug 42 provided at the end of the optical fiber 60 is placed and constitutes the negative direction side of the x-axis direction of the positioning member 220. Moreover, as shown in FIG. 6, the plug mounting part 222 is a plate-shaped member which has a rectangular shape in planar view from the z-axis direction. Further, as shown in FIG. 7, the plug mounting portion 222 is located on the upper surface of the package substrate 22. Further, the details of the plug 42 will be described later.

Further, in the approximate center of the upper surface of the plug mounting portion 222 in the y-axis direction, as shown in FIG. 5, the insertion direction when the plug 42 is pressed toward the optical coupling portion 224 is provided, that is, the embodiment. Groove G1 in the x-axis direction. In the plug mounting portion 222, a portion on the negative side in the y-axis direction of the groove G1 is referred to as a flat portion F1, and a portion on the positive side in the y-axis direction from the groove G1 is referred to as a flat portion F2. The height h1 from the upper surface of the package substrate 22 to the upper surface of the plug mounting portion 222 which is in contact with the lower surface of the plug 42, as shown in Fig. 7, is from the upper surface of the package substrate 22 to the upper surface of the sealing resin 24. The height h2 is low.

As shown in FIG. 5, the optical coupling portion 224 constitutes a portion of the positioning member 220 on the positive side in the x-axis direction. The lower surface of the optical coupling portion 224 is located on the positive side in the z-axis direction from the lower surface of the plug mounting portion 222. Further, as shown in FIG. 7, the optical coupling unit 224 is placed on the sealing resin 24 on the package substrate 22 with the light-emitting element array 100 interposed therebetween.

Further, as shown in FIG. 5, the optical coupling portion 224 has a main body 226 and a contact portion 228. The body 226 has a rectangular parallelepiped shape. The contact portion 228 protrudes from the flat surface portion F2 of the plug mounting portion 222 from the end surface S2 of the main body 226 on the negative side in the x-axis direction to substantially the center of the flat portion F1 in the x-axis direction. Thereby, the optical coupling unit 224 has an L shape when viewed in plan from the z-axis direction. Further, an end surface of the contact portion 228 on the negative side in the x-axis direction is referred to as an end surface S3. Also, in the optical coupling portion 224 A recess D1 and a convex lens 230 are provided.

The concave portion D1 is provided in the vicinity of the side L4 on the positive side in the y-axis direction of the optical coupling portion 224. Moreover, the recessed portion D1 overlaps with the optical axis of the light-emitting element array 100 when viewed in plan from the z-axis direction. Further, the concave portion D1 overlaps with the optical axis of the optical fiber 60 connected to the plug 42 when viewed in plan from the x-axis direction. Further, the optical axis of the light-emitting element array 100 is parallel to the z-axis direction, and the optical axis of the optical fiber 60 is parallel to the x-axis. Moreover, the recessed portion D1 has a rectangular shape when viewed in plan from the z-axis direction. Further, as shown in FIG. 7, the concave portion D1 has a V shape when viewed from the y-axis direction.

The inner peripheral surface of the concave portion D1 on the negative side in the x-axis direction is the total reflection surface R1. The total reflection surface R1 is parallel to the y-axis, and is inclined counterclockwise by 45° with respect to the z-axis when viewed from the negative side in the y-axis direction. Also, the refractive index of the positioning member 200 is sufficiently larger than air. Therefore, the laser beam B1 emitted from the light-emitting element array 100 toward the positive side in the z-axis direction enters the optical coupling portion 224 along the optical axis of the light-emitting element array 100, and passes through the total reflection surface R1 to the optical fiber 60. The optical axis is totally reflected on the negative side in the x-axis direction, and travels through the plug 40 to the optical fiber 60. That is, the positioning member 220 optically couples the light-emitting element array 100 with the optical axis of the optical fiber 60 by reflection, thereby optically coupling the optical fiber 60 to the light-emitting element array 100. Further, when the light trace of the laser beam B1 is viewed from the y-axis direction, the angle between the optical axis of the laser beam B1 emitted from the light-emitting element array 100 and the total reflection surface R1 is 45°, and the laser beam B1 toward the optical fiber 60 The angle between the optical axis and the total reflection surface R1 is 45°. That is, the angle formed by the total reflection surface R1 and the optical axis of the optical fiber 60 is equal to the angle formed by the total reflection surface R1 and the light-emitting element array 100.

The convex lens 230 is provided on the lower surface of the light coupling portion 224 as shown in FIGS. 6 and 7 . Further, the convex lens 230 overlaps with the light-emitting element array 100 when viewed in plan from the z-axis direction. Thereby, the convex lens 230 opposes the light-emitting element array 100 and is located on the optical path of the laser beam B1. Again The mirror 230 has a semicircular shape that protrudes toward the negative side of the z-axis when viewed from a direction orthogonal to the z-axis. Therefore, the laser beam B1 emitted from the light-emitting element array 100 is condensed or collimated by the convex lens 230, and is incident on the total reflection surface R1.

The positioning member 240 for the light receiving element has a rectangular shape when viewed in plan from the z-axis direction. Further, as shown in FIG. 5, the positioning member 240 includes a plug mounting portion 242 and a light coupling portion 244.

The plug mounting portion 242 is a portion on which the plug 46 provided at the end of the optical fiber 60 is placed and constitutes the negative direction side of the x-axis direction of the positioning member 240. Further, as shown in FIG. 6, the plug mounting portion 242 is a plate-like member having a rectangular shape when viewed in plan from the z-axis direction. Further, as shown in FIG. 7, the plug mounting portion 242 is located on the upper surface of the package substrate 22. Further, the details of the plug 46 will be described later.

Further, in the approximate center of the upper surface of the plug mounting portion 242 in the y-axis direction, as shown in FIG. 5, the insertion direction when the plug 46 is pressed toward the optical coupling portion 244 is provided, that is, the embodiment. Groove G2 in the x-axis direction. In the plug mounting portion 242, a portion on the negative side in the y-axis direction of the groove G2 is referred to as a flat portion F3, and a portion on the positive side in the y-axis direction from the groove G2 is referred to as a flat portion F4. The height h3 from the upper surface of the package substrate 22 to the upper surface of the plug mounting portion 242 which is in contact with the lower surface of the plug 46 is larger than the upper surface of the package substrate 22 to the upper surface of the sealing resin 24 as shown in FIG. The height h2 is low.

As shown in FIG. 5, the optical coupling portion 244 constitutes a portion of the positioning member 240 on the positive side in the x-axis direction. The lower surface of the optical coupling portion 244 is located on the positive side in the z-axis direction from the lower surface of the plug mounting portion 242. Moreover, as shown in FIG. 7, the optical coupling unit 244 is placed on the sealing resin 24 placed on the package substrate 22 with the light receiving element array 50 interposed therebetween.

Furthermore, the optical coupling portion 244 has a body 246 and an abutting portion 248. Ontology 246 It has a rectangular parallelepiped shape. The abutting portion 248 protrudes from the flat surface portion S5 of the plug guide portion 242 from the end surface S5 on the negative side in the x-axis direction of the main body 246 to substantially the center of the flat portion F4 in the x-axis direction. Thereby, the light coupling portion 244 has an L shape when viewed in plan from the z-axis direction. Further, an end surface of the contact portion 248 on the negative side in the x-axis direction is referred to as an end surface S6. Further, the light coupling portion 244 is provided with a concave portion D2 and a convex lens 250.

The concave portion D2 is provided in the vicinity of the side L5 on the positive side in the y-axis direction of the optical coupling portion 244. Moreover, the concave portion D2 overlaps with the light receiving element array 50 when viewed in plan from the z-axis direction. Further, the recessed portion D2 overlaps with the optical axis of the optical fiber 60 connected to the plug 46 when viewed in plan from the x-axis direction. Further, the optical axis of the light receiving element array 50 is parallel to the z-axis direction. Further, the concave portion D2 has a rectangular shape when viewed in plan from the z-axis direction. Further, as shown in FIG. 7, the concave portion D2 has a V shape when viewed from the y-axis direction.

The inner peripheral surface of the concave portion D2 on the negative side in the x-axis direction is the total reflection surface R2. The total reflection surface R2 is parallel to the y-axis, and is inclined counterclockwise by 45° with respect to the z-axis when viewed from the negative side in the y-axis direction. Also, the refractive index of the positioning member 200 is sufficiently larger than air. Therefore, the laser beam B2 emitted from the optical fiber 60 toward the positive side in the x-axis direction enters the optical coupling portion 244 along the optical axis of the optical fiber 60, and passes through the total reflection surface R2 to the optical axis of the light receiving element array 50. The negative side of the parallel z-axis direction is totally reflected, and travels through the sealing resin 24 to the light-receiving element array 50. That is, the positioning member 240 optically couples the optical fiber 60 to the light receiving element array 50 by causing the light receiving element array 50 to coincide with the optical axis of the optical fiber 60 by reflection. Further, when the light beam of the laser beam B2 is viewed from the y-axis direction, the angle between the optical axis of the laser beam B2 emitted from the optical fiber 60 and the total reflection surface R2 is 45°, and the laser beam B2 toward the light receiving element array 50 The angle between the optical axis and the total reflection surface R2 is 45°. That is, the angle formed by the total reflection surface R2 and the optical axis of the optical fiber 60 is equal to the angle formed by the total reflection surface R2 and the light receiving element array 50.

The convex lens 250 is provided on the lower surface of the light coupling portion 244 as shown in FIGS. 6 and 7 . Further, the convex lens 250 is overlapped with the light receiving element array 50 when viewed in plan from the z-axis direction. Thereby, the convex lens 250 faces the light-receiving element array 50 and is located on the optical path of the laser beam B2. Further, the convex lens 250 has a semicircular shape that protrudes toward the negative side of the z-axis when viewed from a direction orthogonal to the z-axis. Therefore, the laser beam B2 emitted from the optical fiber 60 is reflected by the total reflection surface R2, and then condensed or collimated by the convex lens 250 to be incident on the light receiving element array 50.

(The structure of the metal cover, see Fig. 1 and Fig. 8)

Next, the metal cover 30 will be described with reference to the drawings.

The metal cover 30 is a piece of metal plate (for example, SUS301) bent into Made with fonts. Further, as shown in FIG. 1, the metal cover 30 covers the positioning member 200 from the positive side in the z-axis direction and the positive side in the y-axis direction and the negative side in the y-axis direction. Further, an opening A3 into which the plug 40 to be described later is inserted is formed on the negative side in the x-axis direction of the socket 20.

As shown in FIG. 8, the metal cover 30 includes a top plate portion 32 and side plate portions 34, 36. The top plate portion 32 is parallel to the surface orthogonal to the z-axis and has a rectangular shape. The side plate portion 34 is formed by bending the metal cover 30 from the long side L6 on the negative side in the y-axis direction of the top plate portion 32 to the negative side in the z-axis direction. The side plate portion 36 is formed by bending the metal cover 30 from the long side L7 on the positive side in the y-axis direction of the top plate portion 32 to the negative side in the z-axis direction.

At the portion on the negative side in the x-axis direction of the top plate portion 32, engaging portions 32a, 32b for fixing the plug 40 to the socket 20 are provided. The engaging portions 32a and 32b are arranged in order from the negative side in the y-axis direction toward the positive side.

The engaging portions 32a, 32b are cut in by the top plate portion 32. Formed by a glyph. Specifically, the engaging portions 32a and 32b are opened by the top plate portion 32 in the positive direction side in the x-axis direction. Font gap and make The portion surrounded by the notch is formed by being concavely curved toward the negative side in the z-axis direction. Thereby, the engaging portions 32a and 32b have a V-shaped shape that protrudes toward the negative side in the z-axis direction when viewed in plan from the y-axis direction.

Further, the short sides L8 on the negative side in the x-axis direction of the top plate portion 32 are provided with engaging portions 32c, 32d for fixing the plug 40 to the socket 20. The engaging portions 32c and 32d are metal pieces that protrude from the top plate portion 32 toward the negative side in the x-axis direction. The engaging portions 32c and 32d are concavely curved toward the negative side in the z-axis direction at positions substantially at the center in the x-axis direction of the engaging portions 32c and 32d. Thereby, the engaging portions 32c and 32d have a V-shaped shape that protrudes toward the negative side in the z-axis direction when viewed in plan from the y-axis direction.

In the long side L9 on the negative side in the z-axis direction of the side plate portion 34, the convex portions C1 to C3 projecting toward the negative side in the z-axis direction are arranged in order from the negative side toward the positive side in the x-axis direction. The convex portions C1 to C3 are fixed to the structural substrate 22 by an adhesive, respectively. Further, the convex portion C1 is connected to the ground conductor exposed portion E2 of the package substrate 22. Further, the convex portion C3 is fitted into the space H1 provided between the leg portion 24b of the sealing resin 24 and the leg portion 24c. Thereby, the metal cover 30 is positioned relative to the package substrate 22.

In the long side L10 on the negative side in the z-axis direction of the side plate portion 36, the convex portions C4 to C6 projecting toward the negative side in the z-axis direction are arranged in order from the negative side in the x-axis direction toward the positive side. The convex portions C4 to C6 are fixed to the package substrate 22 by an adhesive, respectively. Further, the convex portion C4 is connected to the ground conductor exposed portion E3 of the package substrate 22. Further, the convex portion C6 is fitted into the space H2 provided between the leg portion 24d of the sealing resin 24 and the leg portion 24e. Thereby, the metal cover 30 is positioned relative to the package substrate 22.

(Configuration of optical fiber connecting element, see Figs. 9 and 10)

Hereinafter, an optical fiber connecting element 70 according to an embodiment will be described with reference to the drawings. The optical fiber connecting element 70 is provided with an optical fiber 60 and a plug 40.

The optical fiber 60 is composed of a core wire and a covering material covering the core wire, and the core wire is composed of a core portion and a covering portion. The core portion is made of a glass material, and the coating portion is composed of a glass material or a glass material coated with a fluorine resin. Further, the covering material is made of a resin such as polyethylene.

At the plug 40, as shown in Fig. 9, the end of the optical fiber 60 is inserted. Further, the plug 40 has a transmitting side plug 42 and a receiving side plug 46, and both of them are made of an epoxy-based or an anti-loning resin.

The signal transmitting side plug 42 is for fixing the optical fiber 60 to the positioning member 220. Moreover, the transmission side plug 42 is provided with the optical fiber insertion part 42a and the protrusion part 42b.

The optical fiber insertion portion 42a constitutes a portion on the positive side in the y-axis direction of the transmitting-side plug 42, and has a rectangular parallelepiped shape extending in the x-axis direction. An opening A1 is provided in a portion of the optical fiber insertion portion 42a on the negative side in the x-axis direction. The opening A1 is filled with a resin for fixing the optical fiber 60.

The opening A1 is formed by cutting the surface S7 located on the upper surface of the optical fiber insertion portion 42a and the end surface S8 on the negative side in the x-axis direction. Further, an inner peripheral surface on the positive side in the x-axis direction of the opening A1 is provided with an insertion port H7 for guiding the core of the inserted optical fiber 60 to the front end of the transmitting-side plug 42. Further, the number of insertion ports H7 corresponds to the number of the optical fibers 60, and is two in the present embodiment.

Further, a concave portion D3 for injecting a matching agent is provided in a portion of the optical fiber insertion portion 42a on the positive side in the x-axis direction. The matching agent is a transparent resin that matches the refractive index between the optical fiber 60 and the transmitting side plug 42 to reduce the refraction of light. Further, the concave portion D3 is recessed from the upper surface of the optical fiber insertion portion 42a toward the lower surface.

An insertion port H7 is provided on the inner circumferential surface of the concave portion D3 on the negative side in the x-axis direction. The insertion port H7 is connected to the inner peripheral surface of the opening A1 on the positive side in the x-axis direction. Therefore, the core wire of the optical fiber 60 reaches the concave portion D3 from the opening portion A1 through the insertion port H7. The end surface of the core wire of the optical fiber 60 reaching the concave portion D3 is located at an inner circumferential surface S9 which is very close to the positive side in the x-axis direction of the concave portion D3. Further, the optical fiber 60 is fixed to the communication side plug 42 by injecting a matching agent made of a transparent resin, for example, an epoxy resin into the opening A1 and the recess D3. Further, the end face of the core of the optical fiber 60 is not in contact with the inner peripheral surface S9. This is because the gap between the expansion and contraction of the optical fiber 60 due to temperature fluctuation or the like is absorbed, and the transmittance of the resin due to whitening or shape deformation of the resin is prevented from being lowered.

A convex lens 44 is provided on the end surface S10 of the optical fiber insertion portion 42a on the positive side in the x-axis direction as shown in FIG. The convex lens 44 has a semicircular shape that protrudes toward the positive side in the x-axis direction when viewed from a direction orthogonal to the x-axis direction. Thereby, the laser beam B1 emitted from the light-emitting element array 100 and reflected by the total reflection surface R1 is condensed or collimated by the convex lens 44.

Further, the convex lens 44 overlaps the optical axis of the optical fiber 60 when viewed in plan from the x-axis direction. Therefore, the laser beam B1 that is condensed or collimated by the convex lens 44 passes through the resin of the optical fiber insertion portion 42a. In addition, the laser beam B1 is transmitted to the core of the core of the optical fiber 60.

As shown in FIG. 9, the surface S7 of the optical fiber insertion portion 42a is provided with a projection N1 that engages with the engagement portion 32a of the metal cover 30. The projection N1 is provided between the opening A1 and the recess D3 in the x-axis direction and extends in the y-axis direction. Further, the projection N1 has a triangular shape that protrudes toward the positive side in the z-axis direction when viewed in plan from the y-axis direction.

On the lower surface of the optical fiber insertion portion 42a, as shown in Figs. 9 and 10, a convex portion C7 is provided. The convex portion C7 corresponds to the groove G1 of the plug mounting portion 222 of the positioning member 220. The convex portion C7 is disposed in parallel with the x-axis from the end surface S8 toward the end surface S10.

As shown in FIG. 9 and FIG. 10, the projection 42b protrudes from the vicinity of the end portion on the negative side in the x-axis direction of the optical fiber insertion portion 42a toward the negative side in the y-axis direction. Thereby, the transmitting side plug 42 has an L shape. Further, the protruding portion 42b functions as a grip portion when the communication side plug 42 is inserted and removed. Further, a substantially rectangular extraction hole is formed in a substantially central portion of the projection 42b from a plan view in the z-axis direction.

Further, the connection operation between the transmitting side plug 42 and the socket 20 is performed by pressing the convex portion C7 along the groove G1 toward the positive side in the x-axis direction. At this time, the end surface S11 of the projection portion 42b on the positive side in the x-axis direction abuts against the end surface S3 of the abutting portion 228 of the positioning member 220 shown in Fig. 5 . Further, the convex lens 44 is not in contact with the end surface S2 of the body 226, and is provided with a gap of about 5 μm. This is because the transmittance is prevented from being lowered due to the occurrence of scratches or stains on the end surface S2 of the convex lens 44 or the body 226.

Further, when the transmitting side plug 42 is connected to the socket 20, the engaging portion 32a of the metal cover 30 is engaged with the projection N1, and the engaging portion 32c is engaged with the corner formed by the surface S7 of the transmitting side plug 42 and the end surface S8. Thereby, the communication side plug 42 is fixed to the socket 20.

The receiving side plug 46 is for fixing the optical fiber 60 to the positioning member 240. Moreover, as shown in FIG. 9, the receiving side plug 46 is provided with the optical fiber insertion part 46a and the protrusion part 46b.

The optical fiber insertion portion 46a constitutes a portion on the negative side in the y-axis direction of the reception side plug 46, and has a rectangular parallelepiped shape extending in the x-axis direction. An opening A2 is provided in a portion of the optical fiber insertion portion 46a on the negative side in the x-axis direction. The opening A2 is filled with a resin for fixing the optical fiber 60.

The opening A2 is formed by cutting the surface S12 located on the upper surface of the optical fiber insertion portion 46a and the end surface S13 on the negative side in the x-axis direction. Further, an inner peripheral surface of the opening portion A2 on the positive side in the x-axis direction is provided to guide the core wire of the inserted optical fiber 60 to the front end of the receiving side plug 46. The insertion port H8. Further, the number of insertion ports H8 corresponds to the number of the optical fibers 60, and is two in the present embodiment.

Further, a concave portion D4 for injecting a matching agent is provided in a portion of the optical fiber insertion portion 46a on the positive side in the x-axis direction. Further, the concave portion D4 is recessed from the upper surface of the optical fiber insertion portion 46a toward the lower surface.

An insertion port H8 is provided on the inner circumferential surface of the concave portion D4 on the negative side in the x-axis direction. The insertion port H8 is connected to the inner peripheral surface of the opening A2 on the positive side in the x-axis direction. Therefore, the core wire of the optical fiber 60 reaches the concave portion D4 from the opening portion A2 through the insertion port H8. The end surface of the core wire of the optical fiber 60 reaching the concave portion D4 is located very close to the inner circumferential surface S14 on the positive side in the x-axis direction of the concave portion D4. Further, the optical fiber 60 is fixed to the reception side plug 46 by injecting a matching agent made of a transparent resin, for example, an epoxy resin into the opening A2 and the recess D4. Further, the end face of the core of the optical fiber 60 is not in contact with the inner peripheral surface S14.

A convex lens 48 is provided on the end surface S15 of the optical fiber insertion portion 46a on the positive side in the x-axis direction as shown in FIG. The convex lens 48 has a semicircular shape that protrudes toward the positive side in the x-axis direction when viewed from a direction orthogonal to the x-axis direction.

Further, the convex lens 48 overlaps the optical axis of the optical fiber 60 when viewed in plan from the x-axis direction. Therefore, the laser beam B2 emitted from the optical fiber 60 is condensed or collimated by the convex lens 48, and travels toward the total reflection surface R2. Further, the laser beam B2 is reflected by the total reflection surface R2 and transmitted to the light receiving element array 50.

As shown in FIG. 9, the surface S12 of the optical fiber insertion portion 46a is provided with a projection N2 that engages with the engagement portion 32b of the metal cover 30. The projection N2 is provided between the opening A2 and the recess D4 in the x-axis direction and extends in the y-axis direction. Moreover, the projection N2 has a triangular shape that protrudes toward the positive side in the z-axis direction when viewed in plan from the y-axis direction.

On the lower surface of the optical fiber insertion portion 46a, as shown in Figs. 9 and 10, a convex portion C8 is provided. The convex portion C8 corresponds to the groove G2 of the plug mounting portion 242 of the positioning member 240. The convex portion C8 is disposed in parallel with the x-axis from the end surface S13 toward the end surface S15.

As shown in FIG. 9 and FIG. 10, the projection 46b protrudes from the end portion on the negative side in the x-axis direction of the optical fiber insertion portion 46a toward the positive side in the y-axis direction. Thereby, the receiving side plug 46 has an L shape. Further, the protruding portion 46b functions as a grip portion when the receiving side plug 46 is inserted and removed. Further, an extraction hole having a substantially rectangular shape when viewed from the z-axis direction is provided substantially at the center of the projection 46b.

Further, the connection operation between the receiving side plug 46 and the socket 20 is performed by pressing the convex portion C8 along the groove G2 toward the positive side in the x-axis direction. At this time, the end surface S16 of the projection portion 46b on the positive side in the x-axis direction abuts against the end surface S6 of the abutting portion 248 of the positioning member 240 shown in FIG. Further, the convex lens 48 is not in contact with the end surface S5 of the body 246, and is provided with a gap of about 5 μm. This is because the transmittance is prevented from being lowered due to the occurrence of scratches or stains on the end surface S5 of the convex lens 48 or the body 246.

Further, when the receiving side plug 46 is connected to the socket 20, the engaging portion 32b of the metal cover 30 is engaged with the projection N2, and the engaging portion 32d is engaged with the corner formed by the surface S12 of the receiving side plug 46 and the end surface S13. Thereby, the receiving side plug 46 is fixed to the socket 20.

In the optical transmission module 10 configured as described above, as shown in FIG. 7, the laser beam B1 emitted from the light-emitting element array 100 toward the positive side in the z-axis direction passes through the sealing resin 24 and the positioning member 220. Further, the laser beam B1 is reflected by the total reflection surface R1 toward the negative side in the x-axis direction, and is transmitted through the plug 40 to the core of the optical fiber 60.

Further, in the optical transmission module 10, the laser beam B2 emitted from the optical fiber 60 toward the positive side in the x-axis direction passes through the positioning member 240. Furthermore, the laser beam B2 is totally reflected from the surface R2 to the z-axis The light is reflected by the sealing resin 24 and transmitted to the light receiving element array 50.

(Production method)

Hereinafter, a method of manufacturing the optical transmission module 10 will be described in the order of the socket 20, the method of connecting the plug 40 to the optical fiber 60, and the assembly of the optical transmission module 10.

(How to manufacture the socket, refer to Figure 11)

A method of manufacturing the socket 20 will be described with reference to the drawings.

First, solder is applied to the upper surface of the mother substrate 122 (not shown in the drawing) which is an assembly of the constituent substrates 22. More specifically, the cream solder is pressed using a squeegee on the mother substrate 122 on which the metal mask is placed. Next, the metal mask is removed from the mother substrate 122, thereby printing the solder to the mother substrate 122.

Next, the capacitor is placed on the solder of the mother substrate 122. Thereafter, the mother substrate 122 is heated to solder the capacitor.

After the capacitor is soldered, an Ag paste is applied to a predetermined position on the mother substrate 122. The driver circuit 26, the light-receiving element array 50, and the light-emitting element array 100 are placed on the applied Ag to perform die bonding. Further, the drive circuit 26 and the light-receiving element array 50 are connected by wire bonding using Au leads, and the drive circuit 26 is connected to the light-emitting element array 100 by wire bonding. Furthermore, the drive circuit 26 is connected to the mother substrate 122 by wire bonding.

Thereafter, the capacitor, the drive circuit 26, the light-receiving element array 50, and the light-emitting element array 100 are subjected to resin molding. Further, the mother substrate 122 is cut using a cutter, thereby obtaining a plurality of package substrates 22.

Next, the positioning member 220 is placed on the package substrate 22 and the sealing resin 24. More specifically, the coating is applied to the region on the negative side in the x-axis direction of the upper surface of the sealing resin 24a. UV hardening type of adhesive. After the application of the adhesive, as shown in FIG. 11, the position of the center T100 of the light-emitting portion of the light-emitting element array 100 is confirmed by the position recognition camera V1.

Next, the loading machine V2 for placing the positioning member 220 on the sealing resin 24 sucks up the positioning member 220. Next, in a state where the mounting machine V2 adsorbs the positioning member 220, the position of the lens center T230 of the convex lens 230 of the positioning member 220 is confirmed by the position recognition camera V3.

The positional data of the center T100 of the light-emitting portion of the light-emitting element array 100 confirmed by the position recognition camera V1 and the positional data of the lens center T230 of the convex lens 230 of the positioning member 220 confirmed by the position recognition camera V3 are used to calculate the light-emitting element array 100. The relative position of the light emitting portion and the convex lens 230. Based on the calculated result, the amount of movement of the loading machine V2 is determined.

Next, the positioning member 220 is moved by the loading machine V2 to determine the amount of movement. Thereby, the lens center T230 of the convex lens 230 coincides with the optical axis of the light emitting element array 100.

The operation of placing the positioning member 240 on the package substrate 22 and the sealing resin 24 is performed in parallel with the mounting operation of the positioning member 220. More specifically, a UV-curable adhesive is applied to a region on the negative side in the x-axis direction of the upper surface of the sealing resin 24a, and the light-receiving portion of the light-receiving element array 50 is confirmed by the position recognition camera V4 as shown in FIG. The location of the center T50.

Next, the loading machine V5 for placing the positioning member 240 on the sealing resin 24 sucks up the positioning member 240. Next, in a state where the loading device V5 adsorbs the positioning member 240, the position of the lens center T250 of the convex lens 250 of the positioning member 240 is confirmed by the position recognition camera V6.

Receiving light from the light-receiving element array 50 confirmed by the position recognition camera V4 The positional data of the center T50 of the part and the positional data of the lens center T250 of the convex lens 250 of the positioning member 240 confirmed by the position recognition camera V6 are used to calculate the relative positions of the light receiving portion of the light receiving element array 50 and the convex lens 250. Based on the calculated result, the amount of movement of the mounted machine V5 is determined.

Next, the positioning member 240 is moved by the loading machine V5 to determine the amount of movement. Thereby, the lens center T250 of the convex lens 250 coincides with the optical axis of the light receiving element array 50.

The disposed positioning members 220, 240 are irradiated with ultraviolet rays. Further, in the ultraviolet irradiation, the positioning members 220 and 240 are in a state in which the mounting machines V2 and V5 are pressed against the package substrate 22 and the sealing resin 24. Thereby, when the UV-type hardener located between the positioning members 220, 240 and the sealing resin 24 is hardened, the positioning members 220, 240 are fixed to the structure substrate 22 and the sealing resin 24 without causing a positional displacement.

Next, the metal cover 30 is attached to the package substrate 22 on which the positioning member 200 is placed. More specifically, the space H1 between the leg portions 24b and 24c of the sealing resin 24 on the upper surface of the mounting substrate 22, the space H2 between the leg portions 24d and 24e, and the convex portions C2, C5 of the metal cover 30 are in contact with each other. A thermosetting adhesive such as an epoxy resin is partially coated. Moreover, a conductive paste such as Ag is applied to the ground conductor exposed portions E2 and E3 of the package substrate 22.

After the application of the adhesive and the conductive paste, the convex portion C3 of the metal cover 30 is fitted to the portion of the sealing portion 24b of the sealing resin 24 and the portion of the leg portion 24c, that is, the space H1. Further, the convex portion C6 is fitted to the portion of the leg portion 24d of the sealing resin 24 and the leg portion 24e, that is, the space H2. Thereby, the position of the metal cover 30 with respect to the structure substrate 22 is determined. Further, at the same time as the positioning of the metal cover 30, the convex portions C1 to C6 are in contact with the adhesive or the conductive paste on the package substrate 22.

After the metal cover 30 is fitted, the package substrate 22 is heated to make the adhesive and conductive Hardening of the paste. Thereby, the metal cover 30 is fixed to the package substrate 22. Further, by attaching the metal cover 30 to the package substrate 22, the convex portions C1, C4 of the metal cover 30 are in contact with the ground conductor exposed portions E2, E3 of the package substrate 22. Thereby, the metal cover 30 is connected to the ground conductor in the package substrate 22, and the ground potential is maintained. The socket 20 is completed by the above steps.

(How to connect the plug to the optical fiber)

First, the optical fiber 60 inserted into the plug 40 is cut to a predetermined length.

Next, the coating near the front end of the optical fiber 60 is removed using a fiber stripper. After the coating near the front end is removed, the opening of the core wire of the optical fiber 60 is exposed.

Next, the optical fiber 60 is pressed from the openings A1, A2 so that the front end of the core of the optical fiber 60 comes close to the faces S9, S14 of the plug 40. Further, the openings A1, A2 and the recesses D3, D4 of the plug 40 shown in Fig. 9 are filled with a transparent resin such as an epoxy resin for fixing the optical fiber 60. Next, the optical fiber 60 is fixed to the plug 40 by hardening the transparent resin.

(Assembling method of optical transmission module)

The plug 40 is attached to the socket 20. The connection of the plug 40 is as described above by the projections C7, C8 of the plug 40 along the slots G1, G2 of the positioning members 220, 240 from the opening A3 provided between the metal cover 30 and the socket 20 toward the x-axis direction. Pressing in the positive direction side is performed. The optical transmission module 10 is completed through the above process.

(effect)

In the positioning member 200, the plug mounting portions 222, 242, the light receiving element array 50, and the light emitting element array 100 are all provided on the upper surface of the package substrate. That is, the plug mounting portions 222, 242 are not provided on the light-emitting element 504 as in the optical connector slot 500, but are provided on the same surface as the light-receiving element array 50 or the light-emitting element array 100. Therefore, the socket 20 including the positioning member 200 and the optical transmission The height of the module 10 does not lower the height of the plug 40 itself, that is, the socket and the optical transmission module of the socket 500 for the optical connector can be made lower in the state in which the strength of the plug 40 is ensured. Further, with this, the application space of the adhesive of the fixed optical fiber 60 in the plug 40 can be secured, so that the optical fiber 60 can be more firmly fixed to the plug 40.

Further, the heights h1, h3 from the upper surface of the package substrate 22 to the upper surfaces of the plug mounting portions 222, 242 which are in contact with the lower surfaces of the plugs 42, 46 are as shown in Fig. 7, from the upper surface of the package substrate 22. The height h2 to the upper surface of the sealing resin 24 is low. Therefore, the height of the socket 20 and the optical transmission module 10 including the positioning member 200 can be suppressed to be lower. Further, if the heights h1, h3 of the upper surfaces of the plug mounting portions 222, 242 which are in contact with the lower surface of the package substrate 22 from the upper surface of the package substrate 22 are lower than the heights of the respective optical elements, the positioning member 200 can be included. The height of the socket 20 and the optical transmission module 10 is further suppressed to a lower level.

However, in the approximate center of the y-axis direction of the upper surface of the plug mounting portions 222, 242, as shown in FIG. 5, the insertion direction when the plug 40 is pressed toward the optical coupling portions 224, 244 is provided, that is, the embodiment. Grooves G1, G2 in the x-axis direction. Thereby, the convex portions C7, C8 of the plug 40 can be attached to the socket 20 along the grooves G1, G2. Therefore, the plug 40 can be placed on the plug mounting portions 222, 242 with high precision. As a result, optical loss due to the optical axis shift of the optical fiber 60 can be suppressed.

Further, when a plurality of optical elements are mounted on the package substrate, the relative positional relationship of the plurality of optical elements may be shifted. Further, in the case where the positioning members corresponding to the respective optical elements are integrated, when the specific optical element and the positioning member are positioned, the positional relationship between the other optical elements and the positioning member is shifted. Therefore, the positioning members 220, 240 are respectively provided for the respective optical elements. Thereby, the positioning members 220 and 240 can be disposed corresponding to the positional shift when each optical element is mounted. Therefore, in the case where the positioning member 200 is integrated with the positioning members 220 and 240, the positional displacement of each of the optical elements can be flexibly matched.

(First modification, see FIG. 12)

As shown in FIG. 12, the difference between the positioning member 200A of the first modification and the positioning member 200 is the heights h4, h5 of the plug mounting portions 222, 242. Other configurations are the same as those of the above embodiment. Therefore, in the present modification, the description other than the plug mounting portions 222, 242 is as described in the above embodiment.

In the positioning member 200A of the first modification, the heights h4 and h5 of the plug mounting portions 222 and 242 are lower than the height h6 of the optical element. Therefore, in the socket 20A and the optical transmission module 10A using the positioning member 200A, it is possible to further reduce the height compared to the socket 20 and the optical transmission module 10 using the positioning member 200.

(Second modification, see Figs. 13 and 14)

The difference between the positioning member 200B of the second modification and the positioning member 200 is the shape of the plug mounting portions 222, 242. Specifically, as shown in FIG. 13 , in the substantially y-axis direction of the upper surface of the plug mounting portions 222 and 242, the insertion direction when the plug 40 is pressed toward the optical coupling portions 224 and 244 is provided, that is, the present embodiment. For example, the convex portions C9 and C10 in the x-axis direction. Along with this, as shown in Fig. 14, grooves G3, G4 are provided on the lower surface of the plugs 42, 46. Other configurations are the same as those of the above embodiment. Therefore, in the present modification, the descriptions other than the plugs 42, 46 and the plug mounting portions 222, 242 are as described in the above embodiments.

Thereby, the plug 40 can be placed on the plug mounting portions 222, 242 with high precision. As a result, optical loss due to the optical axis shift of the optical fiber 60 can be suppressed.

(Other embodiments)

The positioning member, the socket and the optical transmission module of the present invention are not limited to the above embodiments. The position members 200, 200A, 200B, the sockets 20A, 20B, and the optical transmission modules 10, 10A can be modified within the scope of the gist.

As described above, the present invention is useful for a positioning member for optically coupling an optical fiber and an optical element, a socket including the positioning member, and an optical transmission module, in particular, for securing the strength of the plug provided at one end of the optical fiber while achieving the connection. The socket of the plug is excellent in the low degree of height.

B1, B2‧‧‧ laser beam

D1, D2, D3, D4‧‧‧ recess

H1~h3‧‧‧height

R1, R2‧‧‧ total reflection surface

22‧‧‧Construction substrate

24‧‧‧ sealing resin

26‧‧‧Drive circuit

40,42,46‧‧‧ plug

44,48‧‧‧ convex lens

50‧‧‧Light-receiving element array (optical component)

60‧‧‧ fiber

100‧‧‧Lighting element array (optical components)

200,220,240‧‧‧ Positioning members

222, 242 ‧ ‧ plug placement

224,244‧‧‧Photocoupler

230,250‧‧‧ convex lens

Claims (7)

A socket for optical communication includes: an optical element; a driving circuit; a mounting substrate having a grounding conductor exposed portion; the driving circuit and the optical element are disposed on an upper surface; and the metal cover is fixed to the mounting substrate And a sealing portion; the sealing resin having a sealing portion covering the optical element and the driving circuit; and a plurality of rectangular parallelepiped members protruding from the sealing portion and having the convex portion for the metal cover therebetween a foot portion of the embedded space; and a positioning member covered by the metal cover, placed on the structure substrate and the sealing resin, such that an optical fiber having a plug at the end is optically coupled to the optical element; The positioning member includes: a plug mounting portion provided on an upper surface of the mounting substrate, and the plug is placed; and an optical coupling portion provided on the mounting substrate with the optical element interposed therebetween, and the optical fiber is reflected by reflection The optical axis is aligned with the optical axis of the optical element; and the conductive paste in which the convex portion is connected to the exposed portion of the ground conductor is provided in the space between the convex portion of the metal cover, and is fixed to the convex A mounting substrate of the adhesive. The socket for optical communication according to Item 1, wherein the height of the upper surface of the plug mounting portion contacting the upper surface of the mounting substrate to the lower surface of the plug is higher than the upper surface of the mounting substrate to the sealing. The height of the upper surface of the sealing resin of the optical element is low. The socket for optical communication, as in the first aspect of the patent application, wherein the package substrate is used The height of the upper surface of the plug mounting portion contacting the surface to the lower surface of the plug is lower than the height from the upper surface of the mounting substrate to the upper surface of the optical element. The socket for optical communication according to any one of claims 1 to 3, wherein an upper surface of the plug mounting portion is provided along an insertion direction when the plug is pressed toward the optical coupling portion. groove. The socket for optical communication according to any one of claims 1 to 3, wherein an upper surface of the plug mounting portion is provided to extend in an insertion direction when the plug is pressed toward the optical coupling portion. The convex part. The socket for optical communication according to any one of claims 1 to 3, which is provided with a plurality of the optical components; the positioning members are respectively provided for the respective optical components. An optical transmission module comprising: a socket for optical communication according to any one of claims 1 to 6; the optical fiber; and the plug.