JP2008292962A - Optical connector fixation structure and optical connector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fixation structure for an optical connector, wherein the optical connector can precisely be positioned when fixed to a substrate and the optical connector can be made compact. <P>SOLUTION: The structure is for fixing the optical connector 4, assembled at a tip portion 5a of an optical fiber 5, to substrates 1 and 2, provided with light input/output terminals having optical axes oblique to the optical axis of the tip portion 5a, with a connector holder 3. At both end portions 41a of the optical connector 4, projection portions 43 are formed which project outward. The connector holder 3 has a pair of elastic holding portions 32 and 32 pressing and holding the optical connector 4 from both sides. The elastic holding portions 32 are each composed of two elastic pieces 34 and 34. The elastic pieces 34 and 34 are formed at an interval, and a projection portion 43 is engaged between them to position the optical connector. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention has a structure for fixing an optical connector assembled at the tip of an optical fiber to a substrate provided with an optical input / output end so that the optical fiber and the optical input / output end are optically connected, and is used for this. The present invention relates to an optical connector.

As a technique for fixing the optical connector, for example, there are those described in Patent Documents 1 to 4.
In recent years, an optical connector assembled at the tip of an optical fiber wired along the substrate is mounted on a substrate on which optical elements such as a light emitting element (semiconductor laser, etc.) and a light receiving element (photodiode, etc.) are mounted. A method of fixing so as to be optically connected to the element has been widely used.
Patent Document 4 describes a structure for fixing this type of optical connector. In this fixing structure, the optical connector is pressed and fixed to the substrate by a connector holder having an elastic piece. In this fixing structure, the optical connector is positioned by inserting the guide piece of the connector holder into the positioning recess formed in the optical connector.
JP 2005-157102 A JP 2006-234854 A Japanese Patent No. 3810598 International Publication No. 2004/097480 Pamphlet

However, the above structure has a problem that it is difficult to reduce the size of the optical connector because it is necessary to form a positioning recess in the optical connector.
In addition, in order to optically connect the optical fiber and the optical element, it is necessary to accurately position the optical connector on the substrate.
The present invention has been made in view of the above circumstances, and an optical connector fixing structure capable of accurately positioning an optical connector when fixing the optical connector to a substrate and reducing the size of the optical connector. An object is to provide an optical connector to be used.

According to a first aspect of the present invention, there is provided an optical connector fixing structure in which an optical connector assembled at a distal end portion of an optical fiber is provided with a light input / output end having an optical axis inclined with respect to the optical axis direction of the distal end portion. The optical connector has an optical axis changing portion for optically connecting the tip end portion of the optical fiber to the optical input / output end, and on both sides of the optical connector, outwardly. The connector holder has a pair of elastic holding portions that hold the optical connector from both sides toward the substrate, and the elastic holding portions respectively hold down the optical connector. Composed of a plurality of elastic pieces, the plurality of elastic pieces are formed at intervals in the optical axis direction of the tip portion of the optical fiber, and the protrusions are fitted between these elastic pieces, Is positioned serial optical connector to the substrate, the optical fiber is characterized in that it is optically connected to the optical input and end.
An optical connector fixing structure according to a second aspect of the present invention is the optical connector fixing structure according to the first aspect, wherein on both sides of the optical connector, a pressing inclined surface that is inclined outward as it approaches the mounting surface facing the substrate is formed. The elastic piece has a connector abutting portion that abuts against the pressing slope and presses the optical connector onto the substrate.
According to a third aspect of the present invention, in the optical connector fixing structure according to the second aspect, the connector abutting portion abuts on the optical connector over the optical axis direction of the tip portion.
An optical connector fixing structure according to a fourth aspect of the present invention is the guide tilt according to any one of the first to third aspects, wherein both sides of the optical connector are inclined inward as approaching the mounting surface. The guide inclined surface is formed so as to push the pair of elastic holding portions outward when the optical connector is mounted on the connector holder.
An optical connector fixing structure according to a fifth aspect of the present invention is the optical connector fixing structure according to any one of the first to fourth aspects, wherein the protruding portion has an arm portion of an optical connector insertion / extraction tool when the optical connector is removed from the connector holder. A locking concave portion into which the locking piece can be inserted is formed.

  An optical connector according to a sixth aspect of the present invention is assembled to a substrate provided with a light input / output end having an optical axis inclined with respect to the optical axis direction of the optical fiber, assembled at the distal end portion of the optical fiber by a connector holder. An optical connector having an optical axis changing portion for optically connecting a tip end portion of the optical fiber with the light input / output end, and protruding portions protruding outward are formed on both side portions of the optical connector, The connector holder has a pair of elastic holding portions that hold the optical connector pressed from both sides toward the substrate, and the elastic holding portion includes a plurality of elastic pieces that respectively hold down the optical connector. The elastic piece is formed at an interval in the optical axis direction of the tip portion of the optical fiber, and the protrusion is fitted between the elastic pieces to be positioned with respect to the substrate. Serial optical fiber, characterized in that it is optically connected to the optical input and end.

According to the present invention, the protruding portions are formed on both side portions of the optical connector, and the elastic holding portion of the connector holder is composed of a plurality of elastic pieces, and the protruding portions are fitted between the elastic pieces. Misalignment of the optical connector is prevented, and the optical connector is accurately positioned.
Furthermore, since each side part of the optical connector is pressed into the elastic piece at a plurality of locations, the optical connector is stably held on the substrate.
Accordingly, the optical connector can be accurately positioned, sufficient optical characteristics (such as light loss) can be ensured, and the optical fiber can be reliably optically connected to the optical input / output end.
Further, the optical connector can be miniaturized as compared with the conventional structure in which the recess into which the guide piece is inserted is formed in the optical connector.

1 and 2 are perspective views showing an embodiment of an optical connector fixing structure according to the present invention.
The optical connector fixing structure of this embodiment is a structure in which the optical connector 4 assembled at the tip portion 5 a of the optical fiber 5 is fixed to the photoelectric conversion module 2 on the circuit board 1 by the connector holder 3.
The photoelectric conversion module 2 is a module in which an optical element (light input / output end 6) is mounted (or built in). The light input / output end 6 includes a light emitting element such as a semiconductor laser (for example, a laser diode: LD) or a light receiving element such as a photodiode (PD).
The optical axis direction of the light input / output end 6 of the photoelectric conversion module 2 is substantially perpendicular to the circuit board 1 (see FIG. 5). The photoelectric conversion module 2 corresponds to the function of driving the light emitting element (optical element 6) and / or the light receiving signal of the light receiving element (optical element 6) based on the control signal from the drive circuit on the circuit board 1. It has a function of transmitting an electrical signal to a processing circuit on the circuit board 1.
In the illustrated example, the photoelectric conversion module 2 is formed in a rectangular parallelepiped shape, and the upper surface is a joint surface 2a to which the optical connector 4 is attached.

FIG. 5 illustrates a configuration in which the light input / output end 6 of the photoelectric conversion module 2 is formed on the bonding surface 2a. The joint surface 2 a extends in a direction along the circuit board 1.
Although not particularly illustrated, the circuit board on which the photoelectric conversion module is mounted includes a photoelectric conversion circuit, a control processing unit, an optical signal processing circuit, an optical element drive circuit, and other electronic components on the circuit board. Various circuits for performing the above are configured.

3A and 3B are diagrams showing the optical connector 4, wherein FIG. 3A is a plan view, FIG. 3B is a front view, and FIG. 3C is a side view. FIG. 4 is a cross-sectional view of the optical connector 4, and FIG. 5 is an enlarged cross-sectional view of the main part of the optical connector 4 shown in phantom lines in FIG.
The optical connector 4 includes a connector main body 41 made of a synthetic resin and the like, and a translucent plate 42 provided on the bottom surface side of the connector main body 41. The bottom surface of the optical connector 4 is a mounting surface 4 a that faces the bonding surface 2 a of the photoelectric conversion module 2.

The optical connector 4 is assembled to the tip portion 5 a of the optical fiber 5. The distal end portion 5a is a single-core optical fiber or an optical fiber strand that is led out to the distal end of the optical fiber 5 that is, for example, a multi-core optical fiber ribbon. In the illustrated example, the distal end portion 5a is a portion that is led out from the optical fiber 5 that is an optical fiber ribbon, and is inserted and fixed to the optical connector 4, and is arranged side by side along the mounting surface 4a of the optical connector 4. Yes. The distal end portion 5a can be positioned by a groove (for example, a V-shaped groove) formed in the connector main body 41 or an insertion hole. Reference numeral 5 b denotes a boot for holding the optical fiber 5.
The optical fiber 5 is not limited to a multi-core optical fiber ribbon, and various configurations such as a single-core optical fiber can be employed.
In the following description, the tip direction of the tip portion 5a of the optical fiber 5 may be referred to as the front, and the opposite direction may be referred to as the back. The front-rear direction here is the optical axis direction of the distal end portion 5 a of the optical fiber 5. Further, the mounting surface 4a side may be referred to as “down” and the opposite surface side (upper surface 4b side) may be referred to as “up”.

As shown in FIGS. 1-3, the connector main body 41 is formed in a block shape, and projecting portions 43, 43 projecting outward are formed on both side portions 41a, 41a. The side refers to a direction along the mounting surface 4a and inclined with respect to the front-rear direction (a direction perpendicular to the front-rear direction in the illustrated example).
The protruding portion 43 in the illustrated example has a substantially rectangular parallelepiped shape, and is formed at a substantially central portion in the front-rear direction of the connector main body 41. The front end surface 43a and the rear end surface 43b of the protrusion 43 are substantially perpendicular to the front-rear direction.

It is preferable to form a locking recess 46 having a substantially L-shaped cross section in the front-rear direction at the lower corner of the protrusion 43.
The locking recess 46 is formed so that a locking piece 62 formed at the tip of the arm portion 61 of the optical connector insertion / extraction tool 60 can be inserted (see FIGS. 8 and 9).

A front pressing inclined surface 44a and a rear pressing inclined surface 44b are formed on the front and rear portions of the protruding portion 43 in the side portion 41a of the connector main body 41, respectively.
The holding inclined surfaces 44a and 44b are portions pressed by the elastic holding portion 32 of the connector holder 3, and are inclined outwardly in the direction approaching the mounting surface 4a (ie, downward).

In the illustrated example, the pressing inclined surfaces 44a and 44b are formed on the front and rear upper portions of the side portion 41a, and portions below the pressing inclined surfaces 44a and 44b are guide inclined surfaces 45a and 45b. It has become. The guide inclined surfaces 45a and 45b are inclined inwardly in the direction approaching the mounting surface 4a (ie, downward).
The guide inclined surfaces 45a and 45b can be formed such that when the optical connector 4 is mounted on the connector holder 3, the pair of elastic holding portions 32 and 32 can be pushed outward.

As shown in FIGS. 4 and 5, a light transmitting plate recess 41b in which the light transmitting plate 42 is disposed is formed on the bottom surface of the connector body 41, and the light transmitting plate 42 is formed in the light transmitting plate recess 41b. Be placed.
The translucent plate 42 is provided on the mounting surface 4 a of the optical connector 4. When the optical connector 4 is placed so as to be superimposed on the photoelectric conversion module 2, the translucent plate 42 is joined to the bonding surface 2 a of the photoelectric conversion module 2. It is arranged to face. The translucent plate 42 is made of glass, synthetic resin, or the like.

As shown in FIG. 5, a recess 47 is formed on the top surface of the light transmitting plate recess 41 b of the connector body 41. The recess 47 is made of a metal vapor deposition film or the like on the inner wall surface which is located on the optical axis extension of the distal end portion 5a of the optical fiber 5 and faces the distal end surface of the distal end portion 5a with a slight clearance. A reflection portion 48 is formed.
The reflecting portion 48 in the illustrated example forms a reflecting surface inclined by 45 degrees with respect to the extension line of the optical axis of the tip portion 5a. When the optical connector 4 is fixed on the photoelectric conversion module 2, the reflecting portion 48 is located above the light input / output end 6, faces the light emitting surface or the light receiving surface of the light input / output end 6, and exits from the distal end portion 5 a. It functions as an optical axis changing unit that irradiates the light entering / exiting end 6 with the incident light bent by 90 degrees, or bends the emitted light from the light entering / exiting end 6 by 90 degrees and enters the tip 5a.
The angle of inclination of the reflecting portion 48 may be any angle that allows optical connection between the tip 5a and the light input / output end 6 having an optical axis inclined with respect to the optical axis direction of the tip 5a, and is limited to the illustrated example. Not.
In the present invention, the optical axis changing unit is not limited to the reflecting unit, and may change the direction of the optical path using a refractive index difference.

An optical path 7 is formed between the distal end portion 5a and the light input / output end 6 by the reflecting portion 48, whereby the distal end portion 5a and the light input / output end 6 are optically connected.
Of the optical path 7, the portion from the reflection portion 48 to the light input / output end 6 is inclined (in the illustrated example, a direction orthogonal to the upper surface) of the circuit board 1. This part of the optical path 7 passes through the translucent plate 42.

6A and 6B are views showing the connector holder 3, wherein FIG. 6A is a plan view, FIG. 6B is a front view, and FIG. 6C is a side view.
The connector holder 3 functions to position and hold the optical connector 4 assembled at the distal end portion 5 a of the optical fiber 5 on the photoelectric conversion module 2 and to hold down the optical connector 4 so as not to be displaced with respect to the photoelectric conversion module 2.
The connector holder 3 includes a flat plate-like base portion 31 on which the optical connector 4 is placed, a pair of elastic holding portions 32 and 32 rising from both side edges 31 a and 31 a of the base portion 31, and an edge portion of the base portion 31. And a holding plate 33 extending downward.

As shown in FIGS. 1 and 2, the connector holder 3 is arranged with the side edge 31 a of the base portion 31 facing in the front-rear direction.
An opening 31c is formed in the base 31, and the light input / output end 6 of the photoelectric conversion module 2 is exposed through the opening 31c.

As shown in FIG. 6, the holding plate 33 includes side holding pieces 33 a and 33 a that extend downward from both side edges 31 a of the base 31, and end holding pieces 33 b that extend downward from both end edges 31 b of the base 31. , 33b.
The side holding pieces 33a and the end holding pieces 33b are formed in a plate shape along the side face and the end face of the photoelectric conversion module 2, respectively. The inner surfaces of the side holding pieces 33a and the end holding pieces 33b are in contact with the side faces and the end faces of the photoelectric conversion module 2, respectively, whereby the connector holder 3 is positioned with respect to the photoelectric conversion module 2.

The elastic holding portions 32, 32 hold the optical connector 4 in a detachable manner by pressing it from both sides, and a connector holding space 35 in which the optical connector 4 is held is provided therebetween.
The elastic holding part 32 includes two elastic pieces 34 and 34, respectively. That is, the elastic holding portions 32 and 32 are configured by a total of four elastic pieces 34.
The elastic piece 34 presses and holds the optical connector 4 on the photoelectric conversion module 2 and is a tongue-like plate having a constant width formed so as to rise from the side edge 31a of the base 31. The space 35 can be bent and deformed elastically in a direction approaching and separating from the space 35.

The elastic piece 34 includes a base extension part 34a extending upward, and a pressing part that extends while tilting toward the inner side (space 35 side) as it goes upward from the tip of the base extension part 34a. 34b and a guide portion 34c extending while being inclined outward as it goes upward from the tip of the pressing portion 34b.
The pressing portion 34b is formed so as to abut on the optical connector 4 at a connector abutting portion 36 that is a tip portion thereof. The connector abutting portion 36 is formed so as to abut against the pressing inclined surfaces 44 a and 44 b in a direction (front-rear direction) along the side edge 31 a of the base portion 31.

The two elastic pieces 34, 34 constituting one elastic holding part 32 are formed at intervals in the front-rear direction. The distance between the elastic pieces 34 and 34 is substantially equal to or slightly larger than the distance in the front-rear direction of the protruding portion 43, and the fitting portion where the protruding portion 43 of the optical connector 4 is fitted between the elastic pieces 34 and 34. 37.
The front-rear direction position of the elastic piece 34 on the front side is preferably ahead of the front-rear position of the light input / output end 6. The position in the front-rear direction of the elastic piece 34 on the rear side is preferably behind the position in the front-rear direction of the light input / output end 6.
As a result, the entire optical connector 4 can be pressed so as to surround the optical connection position, a uniform pressing force can be applied to the optical connector 4, and the optical connection accuracy between the optical fiber 5 and the optical input / output end 6 can be improved. .
The connector holder 3 can be made of metal or synthetic resin. For example, it can be formed by bending a metal plate.

Next, an operation for attaching the optical connector 4 to the connector holder 3 will be described.
As shown in FIG. 1, when the optical connector 4 is moved toward the connector holder 3 with the mounting surface 4 a directed toward the photoelectric conversion module 2, the guide inclined surfaces 45 a, 45 b are respectively elastic pieces 34 (guide portions). 34c).
Since the optical connector 4 abuts on the four elastic pieces 34, the optical connector 4 is mounted while its posture is kept horizontal.

When a downward force is applied to the optical connector 4, the elastic piece 34 is pushed outward in accordance with the inclined surfaces of the guide inclined surfaces 45a and 45b.
When the boundary portion between the pressing inclined surfaces 44a and 44b and the guiding inclined surfaces 45a and 45b passes through the connector contact portion 36, the connector contact portion 36 contacts the pressing inclined surfaces 44a and 44b due to the elasticity of the elastic piece 34. .
As shown in FIGS. 2 and 7, in the state where the mounting surface 4a reaches the base 31, the optical connector 4 is in a state where the connector abutting portion 36 of the elastic piece 34 presses the pressing inclined surfaces 44a and 44b on both sides. Is accommodated in the connector holding space 35.
Since the connector abutting portion 36 abuts against the pressing inclined surfaces 44a and 44b in the front-rear direction, the optical connector 4 is stably held as compared with the case where the elastic piece makes point contact with the optical connector.

The protruding portion 43 of the optical connector 4 is fitted into a fitting portion 37 that is a gap between the elastic pieces 34 and 34. When the side edges of the elastic pieces 34, 34 abut against the front end surface 43 a and the rear end surface 43 b of the protrusion 43, the positional displacement in the front-rear direction is prevented, and the optical connector 4 is accurately positioned.
Furthermore, the optical connector 4 is stably held on the photoelectric conversion module 2 because the front and rear portions of the both side portions 41a of the optical connector 4 are pressed by the elastic pieces 34, respectively.
In a state where the optical connector 4 is held by the connector holder 3, the tip portion 5a and the light input / output end 6 can be optically connected by the reflecting portion 48 (see FIG. 5).

Next, an operation for removing the optical connector 4 from the connector holder 3 will be described.
As shown in FIG. 8, the optical connector insertion / extraction tool 60 is a tweezer-like tool in which the base ends of a pair of arm portions 61 are connected via a connecting portion (not shown). A hook-shaped locking piece 62 that is bent substantially vertically toward the arm 61 on the other side is formed.
The arm portions 61 and 61 are brought close to each other against the elastic force of the connecting portion (not shown), and the locking piece 62 is inserted into the locking recess 46. Thereby, the optical connector 4 is held so as to be held from both sides.
As shown in FIG. 9, when the arm portion 61 is raised, an upward force is applied to the protruding portion 43 by the locking piece 62, and the optical connector 4 is pulled out from the connector holder 3.
Further, the operation of attaching the optical connector 4 to the connector holder 3 can also be performed in a state where the optical connector 4 is held by the arm portion 61.

According to this optical connector fixing structure, the elastic holding portion 32 of the connector holder 3 is composed of two elastic pieces 34 spaced in the front-rear direction, and the optical connector 4 protrudes into the fitting portion 37 between the elastic pieces 34, 34. Since the portion 43 is fitted, the positional displacement in the front-rear direction is prevented, and the optical connector 4 is accurately positioned.
Furthermore, since the optical connector 4 is pressed by the elastic piece 34 at the front and rear portions of the side portions 41a, that is, at a total of four locations, the optical connector 4 is stably held on the photoelectric conversion module 2.
Therefore, the optical connector 4 can be accurately positioned, sufficient optical characteristics (such as light loss) can be ensured, and the optical fiber 5 can be reliably optically connected to the optical input / output end 6.
Further, in this optical connector fixing structure, it is not necessary to form a recess in the optical connector 4 as compared with the conventional structure in which the recess into which the guide piece is inserted is formed in the optical connector. Is possible.

In the illustrated example, each of the elastic holding portions 32 includes two elastic pieces 34 and 34. However, the elastic holding portion 32 is not limited thereto, and may be formed of three or more elastic pieces. In this case, the protrusion may be fitted into one fitting portion of the gap between the elastic pieces.
The optical connector used in the present invention can be said to be a surface mount optical connector, and the optical connector fixing structure according to the present invention is a structure itself for receiving and holding the optical connector. For example, even if there is no fixing member such as a photoelectric conversion module to which the light input / output end is fixed (for example, a configuration in which the connector holder also functions as a fixing member) If it is the structure which opposes, it can be said that the optical connector fixing structure which concerns on this invention is comprised.
In the present invention, “substrate” refers to all mounting objects on which optical elements as light input / output ends are mounted, and corresponds to the circuit board 1 and the optical module 2 in the illustrated example.

It is a disassembled perspective view which shows an example of the optical connector fixing structure which concerns on this invention. It is a perspective view which shows an example of the optical connector fixing structure which concerns on this invention. It is a figure which shows the optical connector shown in FIG. 1, (a) is a top view, (b) is a front view, (c) is a side view. It is sectional drawing which shows the optical connector shown in FIG. It is sectional drawing which shows the principal part of the optical connector shown in FIG. It is a figure which shows the connector holder shown in FIG. 1, (a) is a top view, (b) is a front view, (c) is a side view. It is a figure which shows the optical connector fixing structure shown in FIG. 1, (a) is a top view, (b) is a front view, (c) is a side view. It is explanatory drawing which shows operation which removes the optical connector shown in FIG. 1 from a connector holder. It is explanatory drawing which shows operation which removes the optical connector shown in FIG. 1 from a connector holder.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Circuit board, 2 ... Photoelectric conversion module, 3 ... Connector holder, 4 ... Optical connector, 4a ... Mounting surface, 5 ... Optical fiber, 6 ... Light input / output end 32 ... Elastic holding part, 34 ... Elastic piece, 36 ... Connector contact part, 43 ... Projection part, 44a, 44b ... Inclined surface for pressing, 45a, 45b ... Guide Inclined surface for use, 46... Locking recess, 48... Reflecting part (optical axis conversion part), 61... Arm part, 62.

Claims (6)

The optical connector (4) assembled to the tip (5a) of the optical fiber (5) is provided with a substrate (1) having a light input / output end (6) having an optical axis inclined with respect to the optical axis direction of the tip. 2) is fixed to the connector holder (3).
The optical connector has an optical axis changing part (48) for optically connecting the tip of the optical fiber with the light input / output end,
Protruding portions (43) protruding outward are formed on both sides (41a) of the optical connector,
The connector holder has a pair of elastic holding portions (32) for holding the optical connector pressed from both sides toward the substrate;
The elastic holding portion is composed of a plurality of elastic pieces (34) that respectively hold down the optical connector, and the plurality of elastic pieces are formed at intervals in the optical axis direction of the distal end portion of the optical fiber,
An optical connector fixing structure in which the protruding portion is fitted between the elastic pieces to position the optical connector with respect to the substrate so that the optical fiber is optically connected to an optical input / output end. . On both sides of the optical connector are formed pressing inclined surfaces (44a, 44b) that are inclined outward as they approach the mounting surface (4a) facing the substrate,
2. The optical connector fixing structure according to claim 1, wherein the elastic piece has a connector abutting portion (36) that abuts against the pressing slope and presses the optical connector onto the substrate. 3.   The optical connector fixing structure according to claim 2, wherein the connector abutting portion abuts on the optical connector over an optical axis direction of the tip portion. On both sides of the optical connector, inclined guide surfaces (45a, 45b) that are inclined inwardly toward the mounting surface are formed,
The said inclined surface for guides is formed so that when the said optical connector is mounted | worn with the said connector holder, the said pair of elastic holding | maintenance part is extended outward. The optical connector fixing structure according to claim 1.   The protrusion is formed with a locking recess (46) into which the locking piece (62) of the arm (61) of the optical connector insertion / extraction tool can be inserted when the optical connector is removed from the connector holder. The optical connector fixing structure according to claim 1, wherein: A connector holder is mounted on a substrate (1, 2), which is assembled to the tip (5a) of the optical fiber (5) and provided with a light input / output end (6) having an optical axis inclined with respect to the optical axis direction of the tip. An optical connector fixed by (3),
An optical axis changing portion (48) for optically connecting the tip of the optical fiber with the light input / output end;
Protruding portions (43) protruding outward are formed on both sides (41a) of the optical connector,
The connector holder has a pair of elastic holding portions (32) for holding the optical connector pressed from both sides toward the substrate;
The elastic holding portion is composed of a plurality of elastic pieces (34) that respectively hold down the optical connector, and the plurality of elastic pieces are formed at intervals in the optical axis direction of the distal end portion of the optical fiber,
The optical connector (4), wherein the protrusion is fitted between the elastic pieces to be positioned with respect to the substrate and the optical fiber is optically connected to an optical input / output end.

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