WO2010095312A1

WO2010095312A1 - Optical transmission module

Info

Publication number: WO2010095312A1
Application number: PCT/JP2009/068269
Authority: WO
Inventors: 弘樹石川
Original assignee: 株式会社村田製作所
Priority date: 2009-02-23
Filing date: 2009-10-23
Publication date: 2010-08-26
Also published as: JPWO2010095312A1

Abstract

A module main body (2) is housed in a housing section (13) of a socket (12). The module main body (2) is composed of a circuit module (7) wherein an electric circuit section (3) and an optical connecting section (4) provided with an optical element (6) are arranged on a substrate (5), and an optical ferrule (8) which fits in the optical connecting section (4). The optical connecting section (4) is provided with a fitting section (9) having an opened upper surface. Reference surfaces of the fitting section (9) for aligning the optical ferrule (8) with the optical element (6) are side surfaces (9a, 9b, 9e) and a far end surface (9d) in the substrate surface direction, and a bottom surface (9c) in the direction perpendicular to a substrate (5). On a surface facing the module main body (2) of a cover section (14), a pressing means (11) which presses the circuit module (7) and the optical ferrule (8) is arranged. By closing the cover section (14) in a state where the module main body (2) having the optical ferrule (8) placed in the fitting section (9) is housed in the housing section (13), the optical ferrule (8) is pressed to the bottom surface of the fitting section (9) to be fitted in a state where the optical ferrule abuts on the bottom surface (9c), and the optical ferrule (8) and the optical element (6) are aligned with each other.

Description

Optical transmission module

The present invention relates to an optical transmission module used for optical communication or the like.

FIG. 8 is a schematic cross-sectional view showing an example of a conventionally proposed optical transmission module (see Patent Document 1). The optical transmission module 51 includes an optical plug 50, a tape fiber 52, a transparent substrate 40, an optical element 42, an electronic circuit 44, a wiring network 46, an optical connection unit 48,

lenses

20 and 54, and a reflection unit 22. ing. The optical connecting portion 48 is formed of a transparent member such as glass or plastic. The end face of the optical connecting portion 48 is cut at an angle of 45 degrees, for example, and the reflecting portion 22 is formed by this cutting.

An optical plug 50 is disposed on the surface side of the transparent substrate 40. A tape fiber 52 is connected to one end side of the optical plug 50. An optical connection portion 48 is provided on the other end side of the optical plug 50. On the other hand, an electronic circuit 44 and an optical element 42 are disposed on the back side of the transparent substrate 40. The electronic circuit 44 and the optical element 42 are electrically connected to each other via a wiring network 46. Further, the optical element 42 has a light emitting surface or a light receiving surface, and these surfaces are arranged in a manner facing the back surface of the transparent substrate 40.

In the optical transmission module 51, for example, when the optical element 42 is a surface emitting laser having a light emitting surface, the laser light emitted from the optical element 42 passes through the transparent substrate 40, passes through the lens 20, and becomes parallel light. The light enters the connection portion 48. This light is reflected by the reflecting portion 22, collected through the lens 54, and enters the tape fiber 52. When the optical element 42 has a light receiving surface, the light emitted from the tape fiber 52 is received by the optical element 42 through a path opposite to the laser light path.

JP 2006-23777 A

The optical transmission module 51 as shown in FIG. 8 has two

lenses

20 and 54 integrally provided on the optical connection portion 48 and the optical plug 50 side. Then, the signal light transmitted through the lens 20 is reflected by the reflecting surface provided in the reflecting portion 22. Therefore, in this optical transmission module 51, loss due to reflection occurs. In addition, unless the placement accuracy of the

lenses

20 and 54 and the reflection portion 22 is increased, optical coupling between the optical element 42 and the tape fiber 52 cannot be performed satisfactorily. Therefore, the optical transmission module 51 has a problem that it is not easy to manufacture.

Furthermore, since the optical transmission module 51 is provided with the optical element 42 and the electric circuit 44 on the back surface side of the transparent substrate 40, the optical transmission module 51 has a problem that it is bulky and requires careful handling.

In order to solve the problems as described above, the present invention has the following configuration. That is, the present invention
A circuit module comprising: an electric circuit portion formed on an upper surface of the substrate; and an optical connection portion provided on the upper surface of the substrate with an optical element electrically connected to the electric circuit portion; and One end side of an optical transmission path to be optically connected is fixed, and an optical ferrule that fits into the optical connection portion, a module main body, a storage portion that stores the module main body, and the circuit that is stored in the storage portion A light transmission module having a lid that covers the module, and a socket comprising:
In order to fit the optical ferrule to the optical connecting portion and optically couple the optical element and the optical transmission path, a fitting portion that opens on the upper surface of the optical connecting portion is provided, and a side surface of the fitting portion is provided. The optical ferrule serves as a reference surface for aligning the optical element with the optical element in the in-plane direction of the substrate, and the bottom surface of the fitting portion is formed on the optical ferrule with respect to the optical element. A reference surface for vertical alignment,
An energizing means for energizing the circuit module and the optical ferrule is provided on a surface of the lid that faces the module main body, and the module main body in a state where the optical ferrule is placed on the fitting portion. The optical ferrule is urged toward the bottom surface of the fitting portion by closing the lid portion in a state of being housed in the fitting portion so as to be in contact with the bottom surface, and the optical ferrule and the optical element are aligned. It is characterized by that.

The optical transmission module of the present invention is formed by housing the module body in the socket housing. The module main body is configured such that an optical ferrule having one end of the optical transmission line fixed thereto can be easily fitted into the fitting portion of the optical connection portion constituting the circuit module. In addition, the fitting part is formed so that the upper surface of the optical connection part is opened at least. Further, the circuit module is formed by forming an electric circuit portion and an optical connection portion including an optical element on the surface side of the same substrate. The optical element has at least one function of light reception and light emission, and is disposed so as to be optically coupled to the optical transmission line of the optical ferrule fitted in the fitting portion.

Therefore, the module body in which the circuit module and the optical ferrule are fitted can be lowered. As a result, the optical transmission module can be prevented from becoming bulky, and the height can be reduced. In addition, the optical transmission module of the present invention does not require the two lenses conventionally provided, and thus the configuration can be simplified.

Further, in the optical transmission module of the present invention, when the optical ferrule is fitted into the fitting portion and the optical element and the optical transmission path are optically coupled, the side surface of the fitting portion is aligned in the substrate plane (horizontal direction). This is the reference plane to be used. In addition, when the optical ferrule and the optical element are optically coupled, the bottom surface of the fitting portion serves as a reference surface that is aligned in the direction perpendicular to the substrate. An energizing means for energizing the circuit module and the optical ferrule is provided on a surface of the lid portion that covers the socket accommodating portion, which faces the module main body. Therefore, when the module main body with the optical ferrule dropped into the fitting portion is put into the socket housing portion and the lid portion is closed, the optical ferrule is pressed against and closely adhered to the bottom surface of the fitting portion by the biasing means. Are optically coupled to the optical element by being positioned in the horizontal and vertical directions.

As described above, the optical transmission module of the present invention can easily and accurately form a module body in which the optical element and the optical ferrule are optically coupled by fitting the optical ferrule and the fitting portion. The module body can be stored in the socket. Then, by setting the module main body in the socket, it is easy to carry around and the handling becomes easy. Further, it can be directly mounted on a mother board (mother board) via a connection terminal provided in the socket housing.

Furthermore, in the optical transmission module of the present invention, the locking portion provided in the lid portion and the shaft portion provided in the storage portion are pivotally supported, and the lid portion is pivoted in a single-opening manner. The biasing means provided on the surface facing the module main body has a larger protruding amount on the rotating distal end side than on the rotating proximal end side of the lid portion. Further, the module main body is housed in the housing portion so that the optical ferrule is disposed so that the optical connection portion faces the rotation distal end side of the lid portion so as to face the rotation proximal end side of the lid portion. Therefore, when the lid is closed, the rotation tip side of the urging means first contacts and presses the optical ferrule, and then the module main body is pressed together with the rotation base end side of the urging means to fit the optical ferrule. Adhere to the bottom of the joint. Therefore, the optical transmission module can be assembled very easily and accurately.

It is a typical perspective view which shows the module main body which comprises one Example of the optical transmission module which concerns on this invention. It is a typical perspective view which shows the socket which comprises the optical transmission module of an Example. It is a typical perspective view for demonstrating the optical transmission module of an Example. It is typical sectional drawing for demonstrating the optical transmission module of an Example. It is typical sectional drawing for demonstrating the optical transmission module of an Example. It is a typical exploded perspective view for demonstrating the circuit module which forms the module main body shown to FIG. 1a. It is a typical perspective view for demonstrating the module main body shown to FIG. 1a. It is a top view for demonstrating the optical connection part in the module main body shown in FIG. 3b. It is a typical disassembled perspective view which shows the example of a formation form of a socket. It is a typical disassembled perspective view for demonstrating the other Example of the optical transmission module which concerns on this invention. It is a typical disassembled perspective view for demonstrating the further another Example of the optical transmission module which concerns on this invention. It is a typical disassembled perspective view which shows another example of a formation form of a socket. It is a typical perspective view which shows the state which closed the cover part to the middle in the example of the formation form of the socket shown to FIG. 7a. It is a typical perspective view which shows the state which closed the cover part in the example of a formation form of the socket shown to FIG. 7a. FIG. 7B is a schematic cross-sectional view for explaining a lid portion of the socket formation example shown in FIG. 7A. It is a figure for demonstrating one example of a conventional optical transmission module.

DESCRIPTION OF SYMBOLS 1 Optical transmission module 2 Module main body 3 Electric circuit part 4 Optical connection part 5 Board | substrate 6 Optical element 7

Circuit module

8,38,47 Optical ferrule 9 Fitting part 10 Submount 12 Socket 13 Storage part 14 Cover part 15 Electrical terminal

Embodiments according to the present invention will be described below with reference to the drawings.

An embodiment of the optical transmission module according to the present invention will be described with reference to FIGS. La, 1b, 1c, 2a, and 2b. The light transmission module 1 is assembled from the module main body 2 shown in FIG. 1a and the socket 12 shown in FIG. 1b. FIG. 1c shows a schematic perspective view of the light transmission module 1. FIG. 2b is a schematic cross-sectional view taken along the line AA in the perspective view of FIG. Lc.

The optical transmission module 1 of the present embodiment is formed by housing the module body 2 in the housing portion 13 of the socket 12. The socket 12 includes a storage portion 13 and a lid portion 14, and FIG. 4 shows an exploded perspective view thereof. Note that the socket 12 is made of, for example, metal or resin.

The lid portion 14 is provided on the upper side of the storage portion 13 and covers the module main body 2 stored in the storage portion 13. The lid portion 14 is configured to rotate in a single-opening manner by pivotally supporting a locking portion 30 provided on the lid portion 14 and a shaft portion 29 provided on the storage portion 13. In addition, the lid portion 14 is provided with a claw portion 31 at the rotation tip portion thereof. The claw portion 31 is engaged with a claw engagement portion 32 provided in the storage portion 13.

As shown in FIG. 1b, electrical terminals 15 used when the optical transmission module 1 is mounted on a mother board are planted on the inner wall of the storage unit 13. In this example, a plurality of electrical terminals 15 are provided along the bottom edge of the storage portion 13 with a space therebetween. Further, as shown in FIGS. 2 a and 2 b, a terminal 25 having a spring property for connecting to the mother hood, which is a tip portion of the electrical terminal 15, protrudes from the lower surface of the storage portion 13.

2b, the back surface side of the substrate 5 of the circuit module 7 constituting the module body 2 is in close contact with the bottom surface of the storage portion 13 of the socket 12. A connection pad (not shown) is provided on the back side of the substrate 5. This connection pad is connected to the electrical terminal 15 of the storage unit 13, whereby the electrical circuit unit 3 is electrically connected to the electrical terminal 15.

The module body 2 is formed by connecting a circuit module 7 and an optical ferrule 8 as shown in FIG. 3b. As shown in FIG. 3 a, the circuit module 7 is formed by forming the electric circuit portion 3 and the optical connection portion 4 on the surface side of the same substrate 5. The electric circuit unit 3 is composed of electronic components such as an IC chip 18 and a passive component 16, for example. The IC chip 18 is a transmission IC or a reception IC, and the passive component 16 is a capacitor, a resistor, a coil, or the like. These electronic components are covered with a cover member 24 formed by molding an insulating resin.

The optical connection portion 4 includes a submount 10 made of ceramic or resin, and a ferrule fixing portion 19 formed adjacent to the submount 10. Further, as shown in FIGS. 2 a, 2 b, and 3 c, the optical connection unit 4 is provided with an optical element 6 that is electrically connected to the electrical circuit unit 3. The optical element 6 is not shown in FIGS. 1a, 3a, 3b. The optical element 6 is attached to the wall surface of the submount 10 facing the front end surface 8 a of the optical ferrule 8 and is embedded in a transparent resin that forms the ferrule fixing portion 19.

The optical element 6 has at least one function of light reception and light emission. As shown in FIG. 3 c, the functional surface (light receiving surface or light emitting surface) 23 of the optical element 6 is arranged toward the fitting portion 9 side so as to be optically coupled to the tip surface 8 a of the optical ferrule 8. . Examples of the optical element 6 include a light emitting element such as a surface emitting laser and a light receiving element such as a photodiode.

The transparent resin forming the ferrule fixing part 19 is formed, for example, within a range of refractive index of 1.4 to 1.6. This refractive index value is almost the same as the refractive index value of the core of the optical fiber. The optical fiber 21 is optically connected to the optical element 6 through the transparent resin of the ferrule fixing part 19. As described above, by setting the refractive index of the transparent resin and the refractive index of the optical fiber 21 to the same value, reflection at the connection surface between the transparent resin and the optical fiber 21 can be reduced.

In addition, the ferrule fixing | fixed part 19 is not necessarily formed entirely with transparent resin. It is sufficient that at least a portion through which light emitted from the optical element 6 and light received by the optical element 6 pass (for example, a region as indicated by S in FIG. 3c) is transparent (has light transmittance).

The ferrule fixing part 19 is formed with a fitting part 9 having an open top surface and a cross-shaped opening. The fitting portion 9 is formed with a reference surface for alignment in the in-plane direction (horizontal direction) of the substrate 5 for optically coupling the optical ferrule 8 to the optical element 6. The reference surfaces are the side surfaces 9 a and 9 b of the inner wall of the fitting portion 9, the side surface 9 e adjacent to these surfaces, and the back side surface 9 d of the fitting portion 9. The side surface 9a and the side surface 9b serve as a horizontal reference surface in the horizontal plane. The side surface 9e and the back side surface 9d serve as a vertical reference surface in a horizontal plane. Furthermore, the bottom surface (fitting bottom surface) 9 c of the fitting portion 9 is a reference surface that is aligned in the vertical direction with respect to the substrate 5 for optically coupling the optical element 6 and the optical ferrule 8. The side surfaces 9a, 9b, 9e are formed obliquely and form an obtuse angle with the surface of the substrate 5. Further, the back side surface 9d faces the front end surface 8a of the optical ferrule 8, so that it is not only used for suppressing light reflection but also used as a horizontal reference surface. And obtuse.

The front end surface 8a of the optical ferrule 8 is formed obliquely so as to fit in close contact with each other according to the angle of the back side surface 9d and to suppress reflection of light. The front end surface 8a and the lower surface of the optical ferrule 8 usually form an obtuse angle of about 93 to 98 degrees, and the front end surface 8a of the optical ferrule 8 and the surface of the substrate 5 form an acute angle. (See FIG. 2b). One end side of an optical fiber 21 as an optical transmission path is fixed to the optical ferrule 8, and the distal end surface 8 a of the optical ferrule 8 and the optical connection portion 4 are optically coupled.

The optical ferrule 8 has a flange portion 28 protruding in the horizontal direction, and the side surfaces 28a and 28b of the flange portion 28 and the lower surface of the flange portion 28 form an obtuse angle. The left side surface 28 a of the flange portion 28 is formed obliquely so as to be in close contact with the side surface 9 a of the fitting portion 9. The right side surface 28 b of the flange portion 28 is formed obliquely so as to be in close contact with the side surface 9 b of the fitting portion 9. Further, the opposing side surfaces 28e of the flange portion 28 are formed obliquely so as to be in close contact with the corresponding side surface 9e.

2a and 2b, the optical connection portion 4 of the circuit module 7 is disposed so as to be opposed to the rotation base end side of the lid portion 14, and is also opposed to the rotation distal end side of the lid portion 14. The module main body 2 is accommodated in the accommodating portion 13 so that the optical ferrule 8 is disposed. The storage portion 13 is provided with a notch 41 for pulling out the optical fiber 21 at a position facing the side surface 8f into which the optical fiber 21 of the optical ferrule 8 is inserted.

A biasing means 11 (11a, 11b) for biasing the circuit module 7 and the optical ferrule 8 is provided on the surface of the lid portion 14 facing the module main body 2. These urging means 11 are elastic plate members made of, for example, an elastomer material. The urging means 11 is provided at two locations on the rotation base end side and the rotation distal end side of the lid portion 14 so as to protrude toward the storage portion 13 side. The protruding amount (thickness) of the urging means 11a on the rotating distal end side is formed larger than the protruding amount of the urging means 11b on the rotating proximal end side.

The module body 2 in a state where the optical ferrule 8 is dropped into the fitting portion 9 is stored in the storage portion 13. Thereafter, when the lid portion 14 is closed, the urging means 11 a continues to be urged after first contacting the optical ferrule 8, and the urging means 11 b also comes into contact with the optical connecting portion 4. Then, the main body module 2 is pressed against the bottom surface of the storage portion 13 by the urging means 11 a and the urging means 11 b. As a result, the optical ferrule 8 is pressed into contact with the bottom surface 9c of the fitting portion 9, and both are fitted, and the optical fiber 21 and the optical element 6 are optically coupled. That is, when the lid portion 14 is closed, the optical ferrule 8 is pressed by the urging means 11 and fitted in contact with the bottom surface 9c of the fitting portion 9, and the optical ferrule 8 and the optical element 6 are positioned. The

In addition, this invention is not limited to the form of the said Example, Various embodiment can be taken. For example, in the above embodiment, the optical ferrule 8 is formed by fixing one end side of the optical fiber 21, but may be one in which one end side of the optical waveguide is fixed.

Further, the shape of the fitting portion of the optical connecting portion constituting the module main body 2 provided in the optical transmission module of the present invention and the shape of the optical ferrule to be fitted therewith are not particularly limited. For example, FIGS. 5 and 6 show other shapes of the fitting portion and the optical ferrule.

In FIG. 5, the optical connection portion 34 is formed by providing a convex portion 33 at the center of the side surface of the optical connection portion 34 that faces the tip surface 38 a of the optical ferrule 38. The fitting portion 39 has a space formed by the side surfaces 39a, 39b, 39d, 39f and the surface of the substrate 5 (the bottom surface 39c of the fitting portion 39). The side surfaces 39a, 39b, 39d, and 39f form an obtuse angle with the bottom surface 39c, respectively. In this example, the side surfaces 39a, 39b, 39d, and 39f of the fitting portion serve as a reference surface for aligning the optical ferrule 38 with respect to the optical element 6 in the horizontal direction. The side surface 39a and the side surface 39b serve as a horizontal reference surface in the horizontal plane. The side surface 39d and the side surface 39f are vertical reference surfaces in a horizontal plane.

The optical ferrule 38 is formed in a U shape by providing a concave portion 37 in the center of the front end surface, and the concave portion 37 is engaged with the convex portion 33. The opposing

side surfaces

37a and 37b of the recess 37 and the side surface 37d adjacent to these

side surfaces

37a and 37b are formed obliquely. The side surfaces 37a, 37b, 37d and the lower surface of the optical ferrule 38 form an obtuse angle. The side surfaces 37a and 37b are formed obliquely so that the side surfaces 39a and 39b of the fitting portion 39 are finally in close contact with each other. Similarly, the side surface 37d is formed obliquely so as to be in close contact with the side surface 39f of the fitting portion 39, and both are finally in close contact. The front end surface 38a of the optical ferrule 38 is formed obliquely so as to be in close contact with the side surface 39d of the fitting portion 39, and both are finally in close contact.

Also, the side surface 38f where the optical fiber 21 of the optical ferrule 38 is inserted and the lower surface are formed obliquely so as to form an obtuse angle. For this reason, the operation | movement at the time of dropping the optical ferrule 38 to the fitting part 39 from the top to the circuit module 7 accommodated in the accommodating part 13 is smooth.

Moreover, in FIG. 6, the optical connection part 64 is an example of the aspect which inserts the optical ferrule 47 from the front end side to the fitting part 45 which has the space which the upper surface of the cross-sectional shape opened substantially convex shape. The lower end side of the optical ferrule 47 protrudes on both sides, and step portions are formed on the left and right side surfaces. The upper side surface 47 a 1 on the left side of the optical ferrule 47 finally comes into close contact with the upper side surface 45 a 1 of the opening space of the fitting portion 45. The lower side surface 47a2 on the left side of the optical ferrule 47 finally comes into close contact with the lower side surface 45a2 of the opening space of the fitting portion 45. In addition, the upper side surface 47 b 1 on the right side of the optical ferrule 47 finally comes into close contact with the upper side surface 45 b 1 of the opening space of the fitting portion 45. The lower end surface 47 b 2 on the right side of the optical ferrule 47 finally comes into close contact with the upper side surface 45 b 2 of the opening space of the fitting portion 45.

The side surfaces 45 a 1, 45 a 2, 45 b 1, 45 b 2 are formed obliquely and form an obtuse angle with the bottom surface 45 c of the fitting portion 45. Further, the side surfaces 47a1, 47a2, 47b1, 47b2 of the optical ferrule 47 are also formed obliquely in accordance with the inclination of the side surfaces 45a1, 45a2, 45b1, 45b2 so as to correspond to the angle. Similarly, the rear side surface 45d of the fitting portion 45 is also formed obliquely in accordance with the front end surface 47a of the optical ferrule 47 formed obliquely, and the two finally come into close contact with each other. In this example, the side surfaces 45 a 1, 45 a 2, 45 b 1, 45 b 2 and the back side surface 45 d of the fitting portion 45 form a reference surface for aligning the optical ferrule 47 with the optical element 6 in the horizontal direction. The side surfaces 45a1, 45a2, 45b1, and 45b2 serve as lateral reference surfaces in the horizontal plane. The back side surface 45d serves as a vertical reference surface in the horizontal plane.

The height L3 of the upper side surfaces 47a1 and 47b1 of the optical ferrule 47 is formed to be greater than the height L4 of the upper side surfaces 45a1 and 45b1 of the opening space of the fitting portion 45 (L3> L4). The height L2 of the lower side surfaces 45a2 and 45b2 of the opening space of the fitting portion 45 is formed to be greater than the height L1 of the lower side surfaces 47a2 and 47b2 of the optical ferrule 47 (L2> L1). As a result, in a state where the optical ferrule 47 is inserted into the fitting portion 45, the upper surface of the optical ferrule 47 protrudes upward from the opening of the fitting portion 45. And the lower surface of the optical ferrule 47 and the bottom face 45c of the fitting part 45 will be in the state which interposed the space | interval. Next, when the lid 14 is closed, the optical ferrule 47 is pressed by the urging means 11 and fitted in contact with the bottom surface 45c of the fitting portion 45, and the optical ferrule 47 and the optical element 6 are positioned. The As in this example, the method of inserting the optical ferrule into the fitting portion is appropriately set according to the formation mode of the optical ferrule and the fitting portion.

Furthermore, the shape of the lid is not limited to the single-open type. For example, the socket 60 shown in FIGS. 7 a, 7 b, and 7 c is an example of a type in which a lid 62 is covered from the upper side of the storage portion 63. A cross-sectional view taken along the line AA of FIG. 7a is shown in FIG. 7d. As shown in this figure, a projection-shaped urging means 61 is provided inside the lid portion 62. The urging means 61 is formed so as to increase in thickness from the left end side in the figure toward the right end side in the figure (a larger amount of protrusion).

In this example, as shown in FIG. 7A, the lid portion 62 is disposed on the upper side of the storage portion 63. Then, as shown in FIG. 7 b, with the lid portion 62 shifted to the right side from the storage portion 63, the locking portions 65 provided at the opposite end edges of the lid portion 62 and the opposite side surfaces of the storage portion 63 are arranged. The provided shaft portion 66 is engaged. Thereafter, as shown in FIG. 7c, the lid 62 is slid to the left in the figure. Then, the module body 2 housed in the housing portion 63 is pressed against the bottom surface of the housing portion 63 by the biasing means 61 formed thicker toward the right side of the figure, and the lid portion 62 is fixed on the housing portion 63. The

Furthermore, the formation mode of the urging means is not particularly limited, and a plurality of urging means 11 may be provided as in the above embodiment, or one urging means may be provided as in the example shown in FIG. A biasing means 61 may be provided.

The optical transmission module of the present invention has a simple structure and is easy to manufacture and handle. For example, the optical transmission module can be applied to applications such as optical communication that require a low profile.

Claims

A circuit module comprising: an electric circuit portion formed on an upper surface of the substrate; and an optical connection portion provided on the upper surface of the substrate with an optical element electrically connected to the electric circuit portion; and One end side of an optical transmission path to be optically connected is fixed, and an optical ferrule that fits into the optical connection portion, a module main body, a storage portion that stores the module main body, and the circuit that is stored in the storage portion A light transmission module having a lid that covers the module, and a socket comprising:
In order to fit the optical ferrule to the optical connecting portion and optically couple the optical element and the optical transmission path, a fitting portion that opens on the upper surface of the optical connecting portion is provided, and a side surface of the fitting portion is provided. The optical ferrule serves as a reference surface for aligning the optical element with the optical element in the in-plane direction of the substrate, and the bottom surface of the fitting portion is formed on the optical ferrule with respect to the optical element. A reference surface for vertical alignment,
An energizing means for energizing the circuit module and the optical ferrule is provided on a surface of the lid that faces the module main body, and the module main body in a state where the optical ferrule is placed on the fitting portion. The optical ferrule is urged toward the bottom surface of the fitting portion by closing the lid portion in a state of being housed in the fitting portion so as to be in contact with the bottom surface, and the optical ferrule and the optical element are aligned. An optical transmission module characterized by that.
The lid portion is structured to pivot in a single-opening manner by pivotally supporting a locking portion provided in the lid portion and a shaft portion provided in the storage portion, and opposed to the rotation proximal end side of the lid portion. The module main body is housed in the housing portion so that the optical ferrule is disposed so that the optical connection portion faces the rotation tip side of the lid portion, and the biasing means is formed by the protrusion shape, When the protrusion of the urging means has a protruding amount larger than the rotation base end side of the lid portion, the rotation tip end side of the urging means is first exposed to the light when the lid portion is closed. 2. The optical transmission module according to claim 1, wherein the optical ferrule is pressed after being in contact with the ferrule so that the optical ferrule is pressed against the bottom surface of the fitting portion and the optical transmission path and the optical element are optically coupled.