JP2009163184A - Optical module and its restraining structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical module which can attain miniaturization. <P>SOLUTION: The optical module 1 includes a housing 11 and a restraint releasing mechanism 14 for releasing restraint of a cage to the housing 11. At the housing 11, a restraining projection 20 which is restrained into a restraining hole formed in an engaging plate 6 is formed. The restraint releasing mechanism 14 includes a releasing member 23 which can rotate toward the housing 11 and a handle 24 which can rotate the releasing member 23. The releasing member 23 includes a shaft part which becomes a support point of rotary motion, a body part 26 which stretches from the shaft part in one direction and a stretching part 28 which stretches from the shaft part in other direction. The handle 24 presses the body part 26 to rotate the releasing member 23, the stretching part 28 shifts the engaging plate 6 by pressing in a direction separating from the housing 11 to release restraint of the engaging plate 6 toward the restraining projection 20. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an SFP type (SFP: Small Form Factor Plaggable) optical module and its locking structure.

The SFP type optical module is designed based on MSA (Multi-Source Agreement) standards, and is configured to be inserted into and removed from a cage provided on the motherboard (see Patent Documents 1 and 2). .
An optical module of this type includes a housing that can be inserted into and removed from a cage, a photoelectric conversion unit provided in the housing, and an unlocking mechanism that unlocks the cage from the housing. is there.
JP 2004-311207 A JP 2002-353471 A

However, the conventional optical module has a problem that the overall size increases depending on the type of optical connector to be inserted. For example, since the SC type optical connector (see JIS C5973) is large in size, the optical module becomes large. Further, the operation range of the unlocking mechanism is increased, and when a plurality of cages are used side by side, high-density mounting may be difficult.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an optical module that can be miniaturized and can be mounted at high density, and a locking structure thereof.

An optical module according to claim 1 of the present invention can be inserted into and removed from a cage provided on a mother board, has a housing having an insertion port for an optical connector, the optical connector inserted into the housing, and the mother board. And an engagement plate that can be elastically deformed in the cage. And a locking protrusion formed in the housing for locking in a locking hole formed in the engagement plate, and the locking release mechanism includes a release member that is rotatable with respect to the housing, A handle for rotating the release member and a cover for pressing the release member are provided, and the release member extends in one direction from the shaft portion serving as a fulcrum of the rotation operation. A main body part, and an extension part extending in the other direction from the shaft part, and the extension part is engaged by the turning operation of the release member when the handle presses the main body part. The plate is pressed and displaced in a direction away from the housing to release the lock on the lock protrusion.
An optical module according to a second aspect of the present invention is the optical module according to the first aspect, wherein the handle is rotatably supported on a rotation shaft formed on the housing, and a press formed on the handle main body. And the pressing protrusion is capable of rotating the release member by pressing the main body portion by displacing the handle main body in the extraction direction.
An optical module according to a third aspect of the present invention is the optical module according to the first or second aspect, wherein the cover includes a cover main body that is locked to the housing, and an elastically deformable pressing piece that extends from the cover main body. The pressing piece is formed so as to elastically press the extending portion in a direction approaching the housing.
An optical module according to a fourth aspect of the present invention is the optical module according to any one of the first to third aspects, wherein a thin concave portion is formed on the outer surface of the housing, and the handle main body is brought closest to the housing. At least a part of the handle main body is disposed inside the thin-walled recess.

  According to a fifth aspect of the present invention, there is provided a locking structure for an optical module which can be inserted into and removed from a cage provided on a mother board, a housing having an insertion port for an optical connector, and the light inserted into the housing. An optical module comprising: an opto-electric conversion unit that converts an optical signal and an electric signal between a connector and the motherboard; and an unlocking mechanism that unlocks the cage with respect to the housing. An engaging plate that is elastically deformable is formed in the cage, and a locking projection that is locked in a locking hole formed in the engaging plate is formed on the housing, The locking release mechanism includes a release member that is rotatable with respect to the housing, a handle that rotates the release member, and a cover that presses the release member. A shaft portion serving as a fulcrum for the rotation operation; a main body portion extending in one direction from the shaft portion; and an extending portion extending in the other direction from the shaft portion, wherein the handle is the main body portion. By the pivoting operation of the release member by pressing, the extension portion presses and displaces the engagement plate in the direction away from the housing, and the engagement of the engagement plate with the engagement protrusion can be released. It is characterized by being.

According to the present invention, since the release member capable of releasing the locking between the optical module and the cage by a rotating operation is used, the structure of the locking releasing mechanism can be simplified. In addition, since the release member can release the locking by displacing the extension portion by pressing the main body portion, the operating range of the release member can be reduced. For this reason, even when using a large optical connector (for example, SC type optical connector), an optical module can be reduced in size.
Further, since the operation of the release member can be reduced, the operating range of the handle for operating the release member can also be reduced. For this reason, it is not necessary to secure a large space for rotating the handle around the optical module, and high-density mounting is possible when a plurality of cages are used side by side.

  1 and 2 are perspective views showing an optical module 1 which is an embodiment of the optical module according to the present invention. FIG. 3 is a perspective view of the optical module 1 viewed from another direction. FIG. 4 is an exploded perspective view of the optical module 1. FIG. 5 is an arrow view showing an outline of a cross section of the optical module 1 in the C1-C2 direction (see FIG. 2). 6 and 7 are perspective views showing the operation of mounting the optical module 1 on the cage 2. 8 and 10 are cross-sectional views of the optical module 1. 9 and 11 are perspective views showing the optical module 1. FIG.

As shown in FIG. 1, the optical module 1 is an SFP type (Small Form-Factor Plaggable) optical module defined in the MSA (Multi-Source Agreement) standard.
Reference numeral 2 denotes a cage which is a storage case in which the optical module 1 can be stored, and reference numeral 3 denotes an optical connector plug (optical connector) inserted into the optical module 1.

Prior to the description of the optical module 1, the cage 2 and the optical connector plug 3 will be described.
As shown in FIG. 1, the cage 2 is made of metal or the like, and is formed in a sleeve shape having an opening 2a on the front side. The cage 2 has a connection terminal (not shown) electrically connected to a circuit on the mother board 4 side, and is provided on the mother board 4.

As shown in FIGS. 1, 6 and 7, the cage 2 is formed with an engagement plate 6 extending toward the opening 2a. The engagement plate 6 can be elastically bent and deformed so that the tip can move in a direction toward and away from the optical module 1. The engagement plate 6 is made of a metal plate, for example.
In the example shown in FIG. 1, the engagement plate 6 is formed on the side plate 2b which is one of the four side plates constituting the cage 2 having a substantially rectangular cross section, and the side plate 2c facing the side plate 2b. The tip can be elastically deformed so that the tip moves in the direction of approaching and separating.
As shown in FIGS. 6 and 7, the engaging plate 6 is formed with a locking hole 6a for locking a locking projection 20 of the optical module 1 described later. The front end portion 6b of the engagement plate 6 is inclined in the separation direction as it goes in the front end direction.

As the optical connector plug 3, a multi-core or single-core optical connector can be exemplified. As the single-fiber optical connector, an SC-type optical connector (SC: Single fiber Coupling optical fiber connector. For example, F04 defined in JIS C5973 reference. Examples thereof include SC2 type optical connectors. The SC2 type optical connector is obtained by omitting a knob attached to the outside of the housing from the SC type optical connector.
As shown in FIGS. 1 and 8, the optical connector plug 3 includes a ferrule 32 in a housing 31.

Next, the optical module 1 will be described.
In the following description, as shown in FIG. 2, the side on which the insertion port 11a of the housing 11 into which the optical connector plug 3 is inserted is referred to as the front, and the opposite direction may be referred to as the rear. Further, the A1 direction in FIG. 2 may be referred to as the upper side, and the A2 direction may be referred to as the lower side. Further, the B1 and B2 directions may be referred to as the width direction.
As shown in FIGS. 1 to 3 and 8, the optical module 1 includes a housing 11 that can be inserted into and removed from the cage 2, a photoelectric conversion unit 12 provided in the housing 11, and a photoelectric conversion unit 12. A circuit board 13 (see FIG. 3) connected to the housing 11 and an unlocking mechanism 14 provided in the housing 11 are provided.

As shown in FIGS. 2 to 5, the housing 11 includes a main body portion 16 having an insertion port 11 a and an insertion portion 17 extending rearward from the rear portion of the main body portion 16.
The main body portion 16 is formed in a cylindrical shape having a rectangular cross section, and a thin concave portion 18 is formed in the front portions of the outer surfaces 16a and 16a in the vertical direction (A1, A2 direction) in FIG. The width L1 of the part in which 18 is formed is narrower than the width L2 of the main body part 16 in other parts (see FIG. 5).

  In the position where the handle body 37 is closest to the housing 11 (see FIGS. 5, 8, and 9), it is desirable that at least a part of the extending portion 37 b of the handle 24 is disposed inside the thin recessed portion 18. As a result, the size of the handle 24 in the width direction can be reduced, and the width of the optical module 1 can be reduced.

As shown in FIG. 5, the thin recessed portion 18 is preferably formed so that the extending portion 37 b of the handle 24 does not protrude outward from the outer side surface 16 a of the housing 11.
In the illustrated example, the depth of the thin recess 18 is equal to or greater than the thickness of the extension 37b, so that the outer surface 37d of the extension 37b is substantially flush with or outside the outer surface 16a of the housing 11. It is located inward from the side surface 16a.
For this reason, the width | variety of the optical module 1 can be made small and a space saving is attained.

  The thin recessed portion 18 is preferably formed at a position away from the locking structure of the optical connector plug 3 formed in the housing 11. That is, it is desirable to form the thin recessed portion 18 at a position closer to the insertion port 11a than the locking claw 11b to be locked to the housing 31 of the optical connector plug 3. As a result, the optical module 1 can be downsized without affecting the operation of the locking structure of the optical connector plug 3.

  On the outer surface of the thin recessed portion 18, a rotation shaft 18 a that fits into a bearing hole 37 c of the handle 24 described later is formed to protrude. The rotation shaft 18a is formed in the lower part (part on the A2 direction side) of the main body part 16, that is, on the lower side (one side) of the housing 11 having a rectangular cross section.

The insertion portion 17 is formed in a cylindrical shape having a rectangular cross section that is slightly narrower than the main body portion 16, and can be inserted into the cage 2 through the opening 2a.
A locking projection 20 that protrudes downward is formed on the lower surface of the front portion of the insertion portion 17. The locking protrusion 20 can be locked in a locking hole 6 a formed in the engagement plate 6 of the cage 2.

As shown in FIG. 8, the photoelectric conversion unit 12 includes a connection component 21 on which the ferrule 32 of the optical connector plug 3 inserted into the optical module 1 faces and a photoelectric conversion element 22.
The photoelectric conversion element 22 has one or both of a function of converting an optical signal into an electric signal and a function of converting an electric signal into an optical signal. The photoelectric conversion element 22 receives light from a light emitting element such as a semiconductor laser or a photodiode. An element can be illustrated.
The photoelectric conversion element 22 is connected to an optical fiber built in the ferrule 32 through an optical fiber built in the connection component 21 so that an optical signal can be transmitted or received.

  The circuit board 13 (see FIG. 3) can be connected to a connection terminal (not shown) of the cage 2 when the insertion portion 17 is inserted into the cage 2. For this reason, the photoelectric conversion element 22 can be electrically connected to the circuit on the mother board 4 side via the circuit board 13 and the connection terminals.

  As shown in FIGS. 3 and 4, the lock release mechanism 14 releases the lock of the cage 2 with respect to the housing 11, and releases the lock of the engagement plate 6 with respect to the lock protrusion 20. 23 (release member), a handle 24 for rotating the release plate 23, and a cover 25 for pressing the release plate 23.

The release plate 23 includes a substantially rectangular plate-like main body portion 26, shaft portions 27 and 27 formed on the main body portion 26, and an extending portion 28 that extends rearward from the rear edge of the main body portion 26. .
A claw portion 26 a is formed at substantially the center of the front edge of the main body portion 26. The claw portion 26a extends in a direction away from the housing 11, and is formed in an L-shaped cross section extending forward from the tip.

As shown in FIG. 4, the shaft portion 27 serves as a fulcrum for the rotation operation of the release plate 23, and is formed to extend outward on both side edges of the rear portion of the main body portion 26. The shaft portions 27 and 27 can be fitted into bearing concave portions 19 a and 19 a formed in the side plate portions 19 and 19 of the main body portion 16 of the housing 11.
Since the shaft portion 27 is formed at the rear portion of the main body portion 26, the main body portion 26 extends forward (one direction) from the shaft portion 27 in the state shown in FIG.

The extension portion 28 is formed in a plate shape narrower than the main body portion 26, and extends rearward (in the other direction) from substantially the center of the rear edge of the main body portion 26 in the state shown in FIGS. 3 and 4. The vicinity of the protrusion 20 is reached.
Two projecting portions 28 a and 28 a are formed to extend rearward from the distal end portion of the extending portion 28. The protrusions 28a, 28a have their tips positioned on both sides of the locking projection 20 when the extension 28 is in a position close to the housing 11 (see FIG. 3).
The release plate 23 can be rotated with the shaft portion 27 as a fulcrum, and thereby the distal end of the extending portion 28 can move in a direction approaching and separating from the housing 21.
In the illustrated example, the extending direction of the extending portion 28 from the shaft portion 27 is substantially opposite to the extending direction of the main body portion 26, but is not limited thereto, and the extending direction of the main body portion 26 is not limited thereto. Any other direction may be used.

The cover 25 includes a cover main body 33 and a plate-like pressing piece 34 extending obliquely rearward from the cover main body 33. The cover 25 is preferably formed of a metal plate.
The cover main body 33 includes a bottom plate portion 35 and side plate portions 36 and 36 erected on both side edges.
The cover 25 can be attached to the housing 11 by engaging a locking projection 36 b formed on the outer surface of the side plate 19 of the housing 11 with a locking hole 36 a formed in the side plate 36.
On the bottom surface of the bottom plate portion 35, a concave portion 35 a having a rectangular shape in plan view is formed at a position in front of the pressing piece 34. The concave portion 35a can be formed by bending and deforming the bottom plate portion 35 toward the housing 11 side. By forming the concave portion 35a, the strength of the bottom plate portion 35 can be increased and the pressing force of the pressing piece 34 can be stabilized.

  The pressing piece 34 can be elastically bent and deformed, and is configured to press the extending portion 28 in a direction approaching the housing 11 due to its elasticity, whereby the tip of the extending portion 28 abuts the housing 11. ing.

The handle 24 rotates the release plate 23 to release the locking of the engaging plate 6 with respect to the locking protrusion 20. The handle 24 includes a handle main body 37 and pressing protrusions 38 formed at both ends of the handle main body 37. It has.
The handle main body 37 includes a long plate-like operation portion 37a and long plate-like extension portions 37b and 37b extending from both ends thereof perpendicularly to the operation portion 37a.
A bearing hole 37c is formed at the tip of the extending portion 37b. The bearing hole 37c is fitted into a rotation shaft 18a formed in the housing 11, and the handle 24 is thereby rotatable about the rotation shaft 18a.
The pressing protrusions 38 and 38 are formed at the distal ends of the extending portions 37b and 37b, respectively, and extend from the distal end of the extending portion 37b in a direction perpendicular to the extending portion 37b and approaching each other.

Next, an operation when the optical module 1 is inserted into the cage 2 will be described.
As shown in FIGS. 6 and 7, the optical module 1 is inserted into the cage 2 through the opening 2a (see FIG. 1). At this time, since the extending portion 28 of the release plate 23 is rotated toward the housing 11 by the pressing piece 34, the insertion operation of the optical module 1 is not hindered.

In the process of inserting the insertion portion 17 into the cage 2, the distal end portion 6 b of the engagement plate 6 is pressed downward by the locking protrusion 20, and the engagement plate 6 is elastically bent and deformed.
When the optical module 1 is further moved in the insertion direction and the locking projection 20 reaches the locking hole 6a, the engaging plate 6 moves in a direction approaching the housing 11 by elastic force, and the locking projection 20 is moved to the locking hole 6a. To fit. As a result, the movement of the optical module 1 is restricted, and the dropping is prevented.
In this state, since the circuit board 13 of the optical module 1 is connected to the connection terminal (not shown) of the cage 2, the photoelectric conversion element 22 is connected to the circuit on the motherboard 4 side via the circuit board 13 and the connection terminal. Electrically connected.

  As shown in FIG. 8, when the optical connector plug 3 is inserted into the optical module 1, the tip surface of the ferrule 32 faces the connection component 21, and the optical fiber (not shown) built in the ferrule 32 is connected to the connection component 21. The optical signal is connected to the photoelectric conversion element 22 so that an optical signal can be transmitted or received.

Next, an operation when the optical module 1 is extracted from the cage 2 will be described.
8 and 9, the extending portion 37b of the handle 24 extends in the vertical direction (A1, A2 direction) along the side surface of the thin recessed portion 18 from the lower portion of the main body portion 16, and the operation portion 37a is The pressing protrusion 38 is positioned at the lower end of the handle 24 at a position close to the upper side (opposed side) of the housing 11 having a rectangular cross section. Hereinafter, the position of the handle 24 is referred to as a normal position.
As shown in FIG. 2, the space located in front of the optical module 1 at the normal position is referred to as a front range 10 (extraction direction range).
8 to 11, the cage 2 is not shown for convenience of explanation. 9 and 11, the cover 25 is not shown.

As shown in FIGS. 10 and 11, when the operation portion 37a of the handle 24 is pulled forward (toward the optical module 1 removal direction) and the handle body 37 is rotated in the counterclockwise direction in FIG. 38 abuts on the lower surface of the front portion of the main body 26 of the release plate 23.
When the handle main body 37 is further rotated, the pressing protrusions 38 press the vicinity of both side edges of the front portion of the main body portion 26 upward (A1 direction), and the release plate 23 is pressed against the elastic force of the pressing piece 34. Rotate around 27.

As a result, the extension portion 28 moves downward, presses the engagement plate 6 downward (in a direction away from the housing 11), and bends and deforms against the elastic force.
When the engagement plate 6 is displaced downward, it is disengaged from the locking projection 20, so that the optical module 1 can be extracted from the cage 2. Hereinafter, the position of the handle 24 from which the optical module 1 can be extracted will be referred to as the extraction position.
In the illustrated example, the extended portion 37b of the handle 24 faces in the front-rear direction at the pulled-out position. For this reason, the handle body 37 has moved within the forward range 10 (see FIG. 2) from the normal position to the drawn position. That is, the release plate 23 can be rotated by displacing the handle main body 37 in the extraction direction side.
In addition, the direction of the extension part 37b in a drawer | drawing-out position may incline so that it may raise to the direction approaching the operation part 37a.

Since the optical module 1 has the release plate 23 that can release the locking of the locking protrusion 20 and the engagement plate 6 by a rotating operation, the structure of the locking release mechanism 14 can be simplified. Further, since the release plate 23 can disengage the locking by displacing the extension 28 by pressing the main body 26, the operating range of the release plate 23 can be reduced.
For this reason, even when using a large optical connector plug 3 (for example, SC type optical connector), the optical module 1 can be reduced in size.
Further, since the release plate 23 can be released by a slight operation, the operation range of the handle 24 for operating the release plate 23 can be reduced. For this reason, it is not necessary to secure a large space for rotating the handle 24 around the optical module 1, and high-density mounting is possible when a plurality of cages 2 are used side by side.

1 is a perspective view showing an embodiment of an optical module according to the present invention. It is a perspective view which shows the optical module shown in FIG. It is a perspective view which shows the optical module shown in FIG. It is a disassembled perspective view which shows the optical module shown in FIG. FIG. 3 is a cross-sectional view of the main part in the C1-C2 direction shown in FIG. 2 of the optical module shown in FIG. It is a perspective view which shows the operation | movement which mounts the optical module shown in FIG. 1 in a cage. It is a perspective view which shows the operation | movement which mounts the optical module shown in FIG. 1 in a cage. It is sectional drawing which shows the optical module shown in FIG. It is a perspective view which shows the optical module shown in FIG. It is sectional drawing which shows the optical module shown in FIG. It is a perspective view which shows the optical module shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Optical module, 2 ... Cage, 3 ... Optical connector plug (optical connector), 4 ... Motherboard, 6 ... Engagement plate, 6a ... Locking hole, 11 ... · Housing, 11a ··· Insertion port, 12 ··· Photoelectric conversion portion, 11a ··· Insertion port, 14 ··· Unlocking mechanism, 16a · · · outer surface of main body of housing, 18a ··· Rotating shaft, 18 ... thin recess, 20 ... locking projection, 23 ... release plate (release member), 24 ... handle, 25 ... cover, 26 ... main body, 27 ... Shaft part, 28 ... Extension part, 33 ... Cover main body, 34 ... Pressing piece, 37 ... Handle main body, 38 ... Pressing protrusion.

Claims (5)

A housing (11) that can be inserted into and removed from a cage (2) provided on the mother board (4) and has an insertion port (11a) for the optical connector (3);
An opto-electric conversion unit (12) for converting an optical signal and an electric signal between the optical connector inserted into the housing and the motherboard;
An unlocking mechanism (14) for unlocking the cage with respect to the housing,
The cage is formed with an elastically deformable engagement plate (6),
A locking projection (20) that locks into a locking hole (6a) formed in the engagement plate is formed on the housing,
The locking release mechanism includes a release member (23) that can rotate with respect to the housing, a handle (24) that rotates the release member, and a cover (25) that presses the release member,
The release member includes a shaft portion (27) serving as a fulcrum for the rotation operation, a main body portion (26) extending in one direction from the shaft portion, and an extending portion extending in the other direction from the shaft portion. (28)
The extension member presses and displaces the engagement plate in a direction away from the housing by the pivoting operation of the release member when the handle presses the main body, thereby releasing the lock on the lock protrusion. An optical module (1) characterized in that it is possible. The handle includes a handle body (37) rotatably supported on a rotation shaft (18a) formed on the housing, and a pressing protrusion (38) formed on the handle body.
2. The optical module according to claim 1, wherein the pressing protrusion is capable of rotating the release member by pressing the main body by displacing the handle main body in the extraction direction side. . The cover includes a cover body (33) that is locked to the housing, and an elastically deformable pressing piece (34) that extends from the cover body,
The optical module according to claim 1, wherein the pressing piece is formed so as to elastically press the extending portion in a direction approaching the housing. A thin-walled recess (18) is formed on the outer surface (16a) of the housing,
4. The light according to claim 1, wherein at least a part of the handle body is disposed inside the thin-walled recess when the handle body is brought closest to the housing. 5. module. A housing (11) that can be inserted into and removed from a cage (2) provided on the mother board (4) and has an insertion port (11a) for the optical connector (3), and the optical connector inserted into the housing An optical module comprising: a photoelectric conversion part (12) for converting an optical signal and an electrical signal between the housing and the motherboard; and an unlocking mechanism (14) for unlocking the cage with respect to the housing. (1) is a structure for locking to the cage,
The cage is formed with an elastically deformable engagement plate (6),
A locking projection (20) that locks into a locking hole (6a) formed in the engagement plate is formed on the housing,
The locking release mechanism includes a release member (23) that can rotate with respect to the housing, a handle (24) that rotates the release member, and a cover (25) that presses the release member,
The release member includes a shaft portion (27) serving as a fulcrum for the rotation operation, a main body portion (26) extending in one direction from the shaft portion, and an extending portion extending in the other direction from the shaft portion. (28)
The engaging plate presses and displaces the engaging plate in a direction away from the housing by the turning operation of the release member when the handle presses the main body, and the engaging plate with respect to the locking projection. An optical module locking structure characterized in that the locking of the optical module can be released.

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