JP5471788B2 - Optical transceiver - Google Patents

Description

  The present invention relates to an optical transceiver.

  As an optical transceiver, an optical transceiver described in Non-Patent Document 1 below is known. The optical transceiver includes an optical transmission subassembly, an optical reception subassembly, a circuit board, a plug connector, and a housing.

  The optical transmitter subassembly and the optical receiver subassembly are electrically connected to the circuit board. The circuit board has a card edge connector. The plug connector has a socket part into which the card edge connector is inserted and an electrical connector part. The housing is provided so as to cover the optical transmission subassembly, the optical reception subassembly, and the circuit board.

"CFP MSA Draft 1.0", [Online], March 23, 2009, [April 20, 2010 search], Internet <http://www.cfp-msa.org/Documents/CFP-MSA- DRAFT-rev-1-0.pdf>

  In the optical transceiver described in Non-Patent Document 1, it is desirable that the terminal of the card edge connector part and the terminal of the socket part are joined by solder or the like from the viewpoint of connection reliability. In addition, the plug connector does not transmit the stress due to the operation of inserting the electrical connector portion of the plug connector into the electrical connector socket of the host system and the operation of removing the electrical connector portion of the plug connector from the electrical connector socket into the optical transceiver. Need to be fixed to the housing.

  By the way, the circuit board may have a dimensional tolerance of thickness. Due to this dimensional tolerance, when both the circuit board and the plug connector are fixed to the housing, stress may be generated in the electrical connection between the circuit board and the plug connector.

  An object of the present invention is to provide an optical transceiver capable of reducing stress in an electrical connection portion between a circuit board and a plug connector.

  An optical transceiver according to an aspect of the present invention includes a plurality of optical subassemblies, a circuit board, a housing, a plug connector, and an elastic member. The plurality of optical subassemblies includes an optical transmission subassembly that converts electrical signals into optical signals and an optical reception subassembly that converts optical signals into electrical signals. The circuit board is electrically connected to the plurality of optical subassemblies. The circuit board has a card edge connector. The housing is provided so as to cover the plurality of optical subassemblies and the circuit board. The plug connector has an electrical connector portion and a socket portion. A card edge connector is inserted into the socket portion. The socket part electrically connects the electrical connector part and the card edge connector. The elastic member is provided between the housing and the circuit board. The plug connector is fixed with respect to the housing. The circuit board is supported by the housing via an elastic member.

  In this optical transceiver, since the plug connector is fixed by the housing, the optical transceiver is configured not to transmit the stress generated by the attaching / detaching operation of the optical transceiver to / from the host system into the optical transceiver. Further, since the circuit board is supported by the housing via the elastic member, it is possible to reduce the stress generated at the electrical connection portion between the circuit board and the plug connector. Furthermore, when an impact is applied to the optical transceiver, stress applied to a connection portion between the circuit board and the plug connector and an element such as an IC mounted on the circuit board can be reduced.

  In one embodiment, the housing may include a first housing part and a second housing part that are separable from each other in a first direction orthogonal to the board surface of the circuit board, the first housing part being The circuit board is covered from one side in the first direction, the second housing part can cover the circuit board from the other side in the first direction, and the plug connector is connected to the first housing part. It may be held between the second housing part.

  In one embodiment, the plug connector may include a pair of ridges extending in a second direction that is parallel to the board surface of the circuit board and intersects the first direction. One of the raised portions protrudes to one side in the first direction, and the other of the pair of raised portions protrudes to the other side in the first direction. The first housing portion and the second housing The portion may be formed with a recess into which the pair of raised portions are fitted.

  In one embodiment, the optical transceiver may further comprise a plug holder provided along the ridge so as to be interposed between the ridge and the housing in the recess, the plug holder having the first direction and the second direction. You may have the 1st press part which presses a plug connector in the 3rd direction which cross | intersects this direction. In one embodiment, the plug holder may have a second pressing portion that presses the plug connector in the first direction.

  In one embodiment, the plug holder may include a protrusion for enabling identification of the orientation of the plug holder. According to this plug holder, it is possible to prevent the plug holder from being disposed in the recess in the wrong direction.

  In one embodiment, the elastic member may be provided along both edges of the circuit board extending in the third direction on the pair of board surfaces of the circuit board.

  In one embodiment, the elastic member and the housing may have conductivity, and the circuit board may have a plurality of ground patterns provided on both edges of the pair of board surfaces. A via electrode that connects two ground patterns facing each other in the first direction may be provided. According to this form of the optical transceiver, the frame ground is provided on the circuit board.

  In one embodiment, the optical transceiver may further include a conductive component provided to cover both edges of the circuit board.

  In one embodiment, the elastic member may include a first elastic member and a second elastic member. The first elastic member may be provided along the board surface on one side of the circuit board and between the first housing portion and the board surface on one side. The second elastic member may be provided along the other substrate surface of the circuit board and between the second housing portion and the other substrate surface. The second elastic member includes a portion extending along a peripheral edge portion of the second housing other than a region where the circuit board is mounted, and is sandwiched between the first housing and the second housing. It may be.

  In one embodiment, the first housing portion may include a portion adjacent to the other surface of the circuit board, and extends along the peripheral edge of the second housing of the second elastic member. The portion may be sandwiched between the second housing and the portion of the first housing, and the adjacent portion may be along a plane including the board surface on the other side of the circuit board. In the optical transceiver of this form, the second elastic member is hardly bent.

  In one embodiment, a groove for fitting the elastic member into the housing may be formed. According to this form of optical transceiver, the elastic member can be easily handled when the optical transceiver is assembled.

  As described above, according to the present invention, an optical transceiver capable of reducing stress in an electrical connection portion between a circuit board and a plug connector is provided.

It is a perspective view of the optical transceiver concerning one embodiment. It is a disassembled perspective view of the optical transceiver shown in FIG. It is a perspective view which shows the state which removed the 2nd housing part and the front cover from the optical transceiver shown in FIG. FIG. 4 is a perspective view of the first housing portion according to the embodiment. It is a perspective view of the circuit board of one embodiment. FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 5. It is a perspective view of the plug connector of one embodiment. It is a perspective view which expands and shows the part of the back side of the 1st housing part shown in FIG. It is a perspective view of the 2nd housing part and gasket concerning one embodiment. It is a perspective view of the plug holder concerning one embodiment. It is sectional drawing along the XI-XI line of FIG. It is sectional drawing along the XII-XII line | wire of FIG. It is sectional drawing which expands and shows a part of cross section shown in FIG. It is sectional drawing which expands and shows a part of optical transceiver which concerns on another embodiment. It is a figure which shows the electroconductive member which concerns on another embodiment. It is sectional drawing which expands and shows a part of optical transceiver which concerns on another embodiment.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals.

  FIG. 1 is a perspective view of an optical transceiver according to an embodiment. FIG. 2 is an exploded perspective view of the optical transceiver shown in FIG. In the following description, “front” is used as a term indicating a direction, and “rear” is used as a word indicating the opposite direction. Further, the front-rear direction may be referred to as a third direction. Further, “second direction” is used as a word indicating a direction intersecting the front-rear direction (third direction) and in which the optical transmission subassembly and the optical reception subassembly are arranged. In addition, “first direction” is used as a word indicating a direction intersecting the second direction and the third direction. The first direction may be referred to as the up-down direction.

  The optical transceiver 10 shown in FIGS. 1 and 2 includes an optical transmission subassembly (TOSA) 12, an optical reception subassembly (ROSA) 14, a circuit board 16, a housing 20, and a plug connector 30.

  In one embodiment, the optical transceiver 10 includes an optical receptacle assembly 18, a shield sheet 22, a front cover 24, an optical multiplexer 26, an optical demultiplexer 28, a pair of plug holders 32, a gasket 34, a pair of gaskets 36, a front A tray 38, rear tray 40, connector 42, holder 44, and screw 46 may be provided.

  The optical transceiver 10 is used by connecting the electrical connector portion 30a of the plug connector 30 to the electrical connector socket of the host system. The optical transceiver 10 is fixed to the host system by screwing screws 46 into the host system.

  The TOSA 12 converts an electrical signal from the circuit board into an optical signal. The TOSA 12 may comprise a semiconductor laser. The ROSA 14 converts the received optical signal into an electrical signal and outputs the electrical signal to the circuit board. ROSA 14 may comprise a photodiode.

  The optical transceiver 10 may include four TOSAs 12 and four ROSAs 14. In the optical transceiver 10, the TOSA 12 is arranged in the second direction on one side (ie, the transmitting side) in the second direction (Y direction), and the ROSA 14 is arranged on the other side (ie, the receiving side). They are arranged in the second direction. The optical transceiver 10 generates four optical signals having different wavelengths by the four TOSAs 12, and multiplexes the four optical signals into an optical connector plug from the outside. Can be provided. Further, the optical transceiver 10 can separate the multiplexed optical signal from the optical connector plug into four optical signals and provide the four optical signals to the four ROSAs 14.

  The TOSA 12 and the ROSA 14 are electrically connected to the circuit board 16. More specifically, the TOSA 12 and the ROSA 14 may be connected to the front end of the circuit board 16. The circuit board 16 may have a card edge connector 16a at the rear end. The card edge connector 16 a is inserted into the socket portion 30 b of the plug connector 30 and is electrically connected to the electrical connector portion 30 a of the plug connector 30. The electrical connector portion 30a of the plug connector 30 is connected to an electrical connector socket of the host system. The plug connector 30 is fixed to the housing 20 via a pair of plug holders 32. Details of the circuit board 16 and the plug connector 30 will be described later.

  The housing 20 is provided so as to cover components of the optical transceiver such as the TOSA 12, the ROSA 14, and the circuit board 16. As shown in FIGS. 1 and 2, the housing 20 includes a first housing part 48 and a second housing part 50. The housing 20 is configured by combining a first housing part 48 and a second housing part 50 with each other. The first housing part 48 and the second housing part 50 are separable from each other in the vertical direction (first direction, Z direction). The first housing part 48 is provided so as to cover the circuit board 16 from the one board surface side, and the second housing part 50 is provided so as to cover the circuit board 16 from the other board surface side. The first housing part 48 and the second housing part 50 are metal members. The first housing part 48 and the second housing part 50 may be, for example, aluminum members plated with Ni.

  FIG. 3 is a perspective view showing a state where the second housing portion and the front cover are removed from the optical transceiver shown in FIG. FIG. 4 is a perspective view of the first housing portion according to the embodiment.

  As shown in FIG. 4, the first housing portion 48 defines a first region R1, a second region R2, and a third region R3 in order from the front to the rear. The first region R1 includes an optical receptacle mounting region R4 for mounting an optical receptacle in the central portion in the second direction (width direction, Y direction). The third region R3 is used as a circuit board mounting region for mounting the circuit board 16. Further, the rear tray 40 is mounted between the circuit board 16 and the first housing portion 48 in the third region R3.

  As shown in FIG. 3, an optical multiplexer 26 and an optical demultiplexer 28 are mounted on both sides of the optical receptacle mounting region R4 in the first region R1, respectively. More specifically, the optical multiplexer 26 is mounted on the transmitting side with respect to the optical receptacle mounting region R4, and the optical demultiplexer 28 is mounted on the receiving side with respect to the optical receptacle mounting region R4. In the second region R2, a front tray 38, a connector 42, and a holder 44 are mounted in order from the front side in the third direction (X direction). The front tray 38 and the holder 44 can be fixed to the first housing portion 48 with screws or the like.

  The optical multiplexer 26 is a component that multiplexes the optical signals from the four TOSAs 12. The optical multiplexer 26 includes four first optical fibers F1 that connect the optical multiplexer 26 and the four TOSAs 12, and a second optical fiber F2 that connects between the optical multiplexer 26 and the optical receptacle. (See FIG. 2). A sleeve is provided at the tip of the second optical fiber F2.

  The first optical fiber F1 passes through the groove GF1 formed in the bottom surface on the transmission side of the first housing portion 48, and is directed to the reception side by being guided by the rear tray 40 in the third region R3. It goes to the front, is further guided by the front tray 38, goes to the transmission side, goes further to the back, and is wired to the corresponding connector 42. The first optical fiber F1 is held at its tip by the connector 42.

  The second optical fiber F2 passes through the groove GF1 and is guided by the rear tray 40 in the third region R3 to go to the reception side, and then to the front side, and then to the bottom side on the transmission side of the first housing portion 48. Wiring is made to the optical receptacle mounting region R4 through the groove GF2 or the groove GF3 formed in (1).

  The first optical fiber F1 and the second optical fiber F2 guided by the groove GF1 and the rear tray 40 and the groove GF3 or GF2 are the front tray 38, the connector 42, the holder 44, and the circuit board 16 and the first housing. It is located between the part 48. Accordingly, the first optical fiber F1 and the second optical fiber F2 are prevented from being lifted from the first housing portion 48.

  The optical demultiplexer 28 is a component that separates the multiplexed optical signal from the optical connector plug into a plurality of optical signals and provides the plurality of optical signals to the corresponding ROSA 14. The optical demultiplexer 28 includes four third optical fibers F3 that connect the optical demultiplexer 28 and the four ROSAs 14, and a fourth optical fiber F4 that connects the demultiplexer 28 and the optical receptacle. And have.

  The third optical fiber F3 passes through the groove GF4 formed in the bottom surface on the receiving side of the first housing portion 48, and is directed to the transmitting side by being guided by the rear tray 40 in the third region R3. It goes to the front side, is further guided by the front tray 38, goes to the receiving side, goes back further, and is wired to the corresponding connector 42. The tip end portion of the third optical fiber F3 is held by the connector 42.

  Further, the fourth optical fiber F4 passes through the groove GF4 and is guided by the rear tray 40 in the third region R3 to go to the transmission side, and then to the front side, and further to the bottom surface of the first housing portion 48. Is routed to the optical receptacle mounting region R4 through the groove GF5 or the groove GF6.

  The groove GF4 and the rear tray 40, and the third optical fiber F3 and the fourth optical fiber F4 guided by the groove GF5 or GF6 are the front tray 38, the connector 42, the holder 44, and the circuit board 16 and the first housing. It is located between the part 48. Therefore, the third optical fiber and the fourth optical fiber are prevented from being lifted from the first housing portion 48.

  In the optical transceiver 10, the connector 42 is engaged with the front tray 38 so as to be movable in the front-rear direction. The TOSA 12 and the ROSA 14 are held by a holder 44. In this optical transceiver 10, when the connector 42 moves rearward and the connector 42 engages with the holder 44, the first optical fiber F1 and the TOSA 12 are optically coupled, and the third optical fiber F3 and the ROSA are connected. 14 are optically coupled.

  As shown in FIG. 4, the first housing portion 48 includes a first wall W1 that defines an optical receptacle mounting region R4. The first wall W1 extends along a plane that intersects the third direction, and defines an optical receptacle mounting region R4 from the rear side.

  A pair of first grooves GS1 and a pair of second grooves GS2 are formed in the first wall W1. The pitch between the first grooves GS1 is substantially the same as the pitch between the grooves GF2 and GF5. One of the first grooves GS1 and the groove GF2 are provided along a straight line extending in the third direction. The other of the first grooves GS2 and the groove GF5 are provided along another straight line extending in the third direction.

  Furthermore, the pitch between the second grooves GS2 is substantially the same as the pitch between the grooves GF3 and GF6. One of the second grooves GS2 and the groove GF3 are provided along a straight line extending in the third direction. The other of the second grooves GS2 and the groove GF6 are provided along another straight line extending in the third direction.

  In one embodiment, the first housing portion 48 may further include a pair of second walls W2 that define the optical receptacle mounting region R4 from both sides in the second direction. A groove GR is formed in each of the second walls W2.

  As described above, the optical receptacle is mounted in the optical receptacle mounting region R4 defined by the first wall W1 and the second wall W2. As shown in FIG. 2, the optical receptacle assembly 18 includes an optical receptacle 52, a shield sheet 22, and a sleeve 54.

  The sleeve 54 is a member provided at the tips of the optical fibers F2 and F4. The sleeve 54 is made of metal, for example. The sleeve 54 has a cylindrical shape extending in the third direction. The sleeve 54 has a stub that holds the ends of the optical fibers F2 and F4 in its inner hole. The sleeve 54 optically couples the optical connector plug from the outside with the TOSA 12 and the ROSA 14. More specifically, when the ferrule of the optical connector plug from the outside is received in the inner hole of the sleeve, the optical fiber held by the ferrule and the optical fiber F2 or F4 are optically coupled. As a result, the optical connector plug and the TOSA 12 and ROSA 14 are optically coupled.

  The optical receptacle 52 is a resin part. The optical receptacle 52 defines two spaces for coupling the optical connector plug and the sleeve 54. The optical receptacle 52 has a plurality of walls that define these spaces.

  The shield sheet 22 is sandwiched between the rear wall portion of the optical receptacle 52 and the first wall W 1 of the first housing portion 48. The shield sheet 22 may be a conductive nonwoven fabric, for example.

  The thus configured optical receptacle assembly 18 is mounted in the optical receptacle mounting region R4. More specifically, a part of the sleeve 54 passes through the groove GS1, and the optical receptacle 52 is mounted in the optical receptacle mounting region R4. The optical receptacle 52 in this example is an SC type optical receptacle capable of latching an SC type optical connector plug. In one embodiment, an LC-type optical receptacle may be mounted as the optical receptacle 52 in the optical receptacle mounting region R4. In the case of the LC type optical receptacle 52, a part of the sleeve 54 passes through the groove GS2.

  As shown in FIGS. 1 and 2, the front cover 24 is attached to the front end wall of the first housing portion 48 using screws 60. The front cover 24 is attached to the front end wall of the first housing portion 48 so that the open end of the optical receptacle 52 is exposed. The front cover 24 presses the optical receptacle 52 toward the first wall W1. Thereby, the shield sheet 22 is sandwiched between the rear wall portion of the optical receptacle 52 and the first wall W1 of the first housing portion 48.

  Hereinafter, details of the circuit board 16 and the plug connector 30 and details of the mounting structure to the housing 20 will be described.

  FIG. 5 is a perspective view of a circuit board according to an embodiment. 6 is a cross-sectional view taken along line VI-VI in FIG. As shown in FIG. 5, the circuit board 16 has a card edge connector 16a at an end portion on the rear side thereof. A plurality of electrode terminals are formed on the card edge connector 16a.

  The circuit board 16 has a pair of edge portions 16b. The pair of edge portions 16b extend in the third direction (X direction) on both sides in the second direction (Y direction). In one embodiment, ground patterns 16c extending in the third direction may be formed on the upper and lower surfaces of the pair of edge portions 16b of the circuit board 16. As shown in FIG. 6, in one embodiment, one or more via electrodes 16d that connect two ground patterns 16c that face each other in the first direction may be provided inside the substrate.

  FIG. 7 is a perspective view of a plug connector according to an embodiment. The plug connector 30 shown in FIG. 7 has an electrical connector portion 30a and a socket portion 30b. The card edge connector 16a of the circuit board 16 is inserted into the socket part 30b. The socket part 30b is provided with a plurality of electrode terminals. The plurality of electrode terminals of the socket portion 30b are connected to the plurality of electrode terminals of the card edge connector 16a. For example, the plurality of electrode terminals of the socket portion 30b are soldered to the plurality of electrode terminals of the card edge connector 16a.

  The plurality of electrode terminals of the socket part 30b are electrically connected to the plurality of electrode terminals of the electrical connector part 30a. Therefore, the host system and the circuit board 16 are electrically connected to each other by fitting the electrical connector portion 30a into the electrical connector socket of the host system.

  In one embodiment, plug connector 30 may have projections 30c on both sides in the second direction. When the plug connector 30 is fixed to the housing 20, the protrusion 30c contacts the rear surface FW3 of the third wall W3 of the first housing portion 48. The third wall W3 is a wall that defines the third region R3 from the rear side.

  Furthermore, in one embodiment, the socket portion 30b of the plug connector 30 may have raised portions 30d on the upper and lower surfaces thereof. One of the raised portions 30d is raised upward, and extends in the second direction. Further, the other of the raised portions 30d is raised on the lower side and extends in the second direction.

  FIG. 8 is an enlarged perspective view showing a rear side portion of the first housing shown in FIG. As shown in FIGS. 4 and 8, the first housing portion 48 may include a third wall W3 that defines the third region R3 from the rear side. The third wall W3 is along a plane that intersects the third direction. A recess GP1 extending in the second direction is formed in the third wall W3. One raised portion 30d of the plug connector 30 is fitted into the recess GP1.

  In one embodiment, as shown in FIG. 4, the first housing portion 48 is formed with grooves GG extending in the third direction at both edges in the second direction of the third region R3. May be. A gasket (elastic member) 36 can be fitted in these grooves GG. In one embodiment, the gasket 36 may be conductive. The gasket 36 may be, for example, a rubber tube whose surface is metal-plated, or a rubber tube containing a conductive material.

  FIG. 9 is a perspective view of a second housing portion and a gasket according to an embodiment. The second housing portion 50 shown in FIG. 9 is a component that constitutes the housing 20 together with the first housing portion 48. The second housing part 50, together with the first housing part 48, defines a first region R1, a second region R2, and a third region R3. Further, the second housing part 50, together with the first housing part 48, defines an optical receptacle mounting region R4.

  As shown in FIG. 9, the second housing part 50 includes a main part 50 a extending in the second direction and the third direction. In one embodiment, a gasket (elastic member) 34 is attached to the main portion 50a along the periphery of the main portion 50a. In one embodiment, the gasket 34 can be electrically conductive. The gasket 34 may be, for example, a rubber tube whose surface is metal-plated or a rubber tube containing a conductive material.

  In the form shown in FIG. 9, the gasket 34 includes both edges in the second direction of the first region R1, the second region R2, and the third region R3, and the second direction of the optical receptacle mounting region R4. Are provided so as to pass through both edges and the rear edge.

  In one embodiment, as shown in Drawing 9, the 2nd housing part 50 may contain two walls 50c. The wall 50c defines the path of the gasket 34 in the third region R3 from the inside. The wall 50c prevents the gasket 34 from moving from the above-described path when an impact is applied to the optical transceiver 10.

  In one embodiment, the 2nd housing part 50 may have a plurality of bosses 50b projected in the 1st direction. The boss 50 b is provided along a bent portion of the path of the gasket 34. The height of the boss 50b with respect to the main portion 50a is higher than the height of the wall 50c with respect to the main portion 50a. Such a boss 50b makes it possible to easily dispose the gasket 34 on the bent path as described above.

  In one embodiment, a concave portion GP2 may be formed in a portion on the rear side of the main portion 50a of the second housing portion 50 so as to extend in the second direction. The other raised portion 30d of the plug connector 30 is fitted into the recess GP2.

  In one embodiment, the plug holder 32 is interposed between one raised portion 30d and the surface that defines the recess GP1, and between the other raised portion 30d and the surface that defines the recess GP2. Can be provided.

  FIG. 10 is a perspective view of a plug holder according to an embodiment. 10A shows a plug holder viewed from one side in the vertical direction, and FIG. 10B shows a plug holder viewed from the other side.

  The plug holder 32 is a sheet metal member made from a metal plate. The plug holder 32 has a shape along the raised portion 30d. More specifically, as shown in FIG. 10, the plug holder 32 includes a top plate portion 32a, a plurality of side plate portions 32b, and a plurality of first pressing portions 32c.

  The top plate portion 32a extends in the second direction. The top plate portion 32a is a portion along the top of the raised portion 30d. The plurality of side plate portions 32b extend in the first direction from both edge portions extending in the second direction of the top plate portion 32a. The plurality of side plate portions 32b are portions along the side surface of the raised portion 30d. The plurality of first pressing portions 32c are provided between two adjacent side plate portions 32b. The plurality of first pressing portions 32c extend in a direction intersecting the top plate portion 32a from both edge portions extending in the second direction of the top plate portion 32a. The plurality of first pressing portions 32c are provided so as to protrude outward in the third direction from the side plate portion 32b. The plurality of first pressing portions 32c can exert a spring force in the third direction.

  In one embodiment, plug holder 32 can have a plurality of 2nd press parts 32d. The plurality of second pressing portions 32d are provided so as to protrude from the top plate portion 32a to the side opposite to the side plate portion 32b in the first direction. The plurality of second pressing portions 32d can exert a spring force in the first direction.

  Moreover, in one Embodiment, the plug holder 32 can contain the convex piece 32e. The convex piece 32e extends from only one edge of the top plate portion 32a and protrudes in the third direction. The convex piece 32e can contribute to the identification of the orientation of the plug holder 32.

  In the optical transceiver 10, when the first housing portion 48 and the second housing portion 50 are assembled to each other, the plug connector 30 is fixed to the housing 20 via the plug holder 32. The circuit board 16 is elastically supported by the housing 20. This will be described in more detail below.

  11 is a cross-sectional view taken along line XI-XI in FIG. As shown in FIG. 11, the plug connector 30 is held between the first housing portion 48 and the second housing portion 50. In this state, one raised portion 30d of the plug connector 30 is accommodated in the recess GP1 of the first housing portion 48, and the other raised portion 30d of the plug connector 30 is within the recess GP2 of the second housing portion 50. Is housed in. A plug holder 32 is interposed between the surface defining the recess GP1 and the one raised portion 30d, and between the surface defining the recess GP2 and the other raised portion 30d.

  As described above, the plug holder 32 is arranged such that the top plate portion 32a and the side plate portion 32b are along the raised portion 30d. The first pressing portion 32c of one plug holder 32 abuts on a surface (rear surface) that defines the recess GP1. Thereby, the 1st press part 32c of one plug holder 32 presses the plug connector 30 ahead with the spring force. Further, the first pressing portion 32c of the other plug holder 32 abuts on a surface (rear surface) that defines the recess GP2. Thereby, the 1st press part 32c of the other plug holder 32 presses the plug connector 30 ahead with the spring force. Further, the second pressing portion 32d of one plug holder 32 abuts on a surface (bottom surface) that defines the recess GP1, and presses the plug connector 30 in the first direction by its spring force. The second pressing portion 32d of the other plug holder 32 abuts against the surface (bottom surface) that defines the recess GP2, and the spring force causes the plug connector 30 to move in the first direction (with one plug holder 32). Press in the opposite direction. Further, as described above, the protrusion 30c of the plug connector 30 abuts on the rear surface FW3 of the third wall W3 of the first housing portion 48.

  Therefore, even if an operation of extracting the optical transceiver 10 from the host system or an operation of mounting the optical transceiver 10 on the host system is performed, the plug connector 30 and the housing are formed by the protrusion 30c and the first pressing portion 32c of the plug holder 32. The relative movement of both 20 in the third direction is restricted. As a result, the stress applied to the connection part (for example, solder joint part) between the plug connector 30 and the circuit board 16 is reduced.

  On the other hand, the circuit board 16 is elastically supported with respect to the housing 20 as described above. 12 is a cross-sectional view taken along line XII-XII in FIG. 13 is a cross-sectional view showing a part of the cross section shown in FIG. 12 in an enlarged manner. As shown in FIGS. 12 and 13, both edge portions 16 b of the circuit board 16 are sandwiched between the first housing portion 48 and the second housing portion 50 via gaskets 34 and 36. Since the circuit board 16 is elastically supported with respect to the housing 20 in this manner, even if there is a dimensional error in the thickness direction of the circuit board 16, an electrical connection portion (for example, It is possible to reduce the stress generated in the solder joint portion.

  In one embodiment, as described above, the gaskets 34 and 36 have conductivity, and the ground pattern 16 c can be provided on both edges 16 b of the circuit board 16. In this embodiment, the circuit board 16 can be elastically supported with respect to the housing 20 via the elastic member, and at the same time, a frame ground connected to the housing 20 can be given to the circuit board 16.

  Further, in one embodiment, the gasket 34 may extend to a region other than the both edges 16 b of the circuit board 16. For example, the gasket 34 extends to the periphery of the first region R1 and the periphery of the second region R2, and is sandwiched between the first housing portion 48 and the second housing portion 50 in these regions. obtain. Here, as shown in FIG. 3, the side wall of the first housing portion 48 is located in a region continuous in the third direction with both edge portions 16 b of the circuit board 16. In one embodiment, the top surface FU <b> 1 of the side wall of the first housing portion 48 may be along a plane including the substrate surface along which the gasket 34 extends out of the substrate surface of the circuit substrate 16. According to this embodiment, there is no discontinuity between the circuit board 16 and the side wall of the first housing portion 48, so that the gasket 34 is hardly bent.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above-described embodiment, and various modifications can be made. For example, as shown in FIG. 8, the recesses GP1 may be formed so as to have different depths alternately in the second direction. In the recess GP1, the depth of the recess in the portion corresponding to the second pressing portion 32d is deeper than the depth of the recess in the other portion. In this case, the spring force by the second pressing portion 32 d does not act on the first housing portion 48.

  FIG. 14 is an enlarged cross-sectional view of a part of an optical transceiver according to another embodiment. As shown in FIG. 14, the conductive member 64 may be provided along the edge 16 b of the circuit board 16. Specifically, the conductive member 64 has a shape along the upper and lower surfaces and the end surface of the edge portion of the circuit board 16. Further, the conductive member 64 is in contact with the gaskets 34 and 36. When the circuit board 16 requires high-density wiring, the circuit board 16 may not be provided with the ground pattern 16c or the via electrode 16d. In such a case, the conductive member 64 can provide a frame ground potential to both edges 16 b of the circuit board 16.

  FIG. 15 is a diagram illustrating a conductive member according to another embodiment. FIG. 16 is an enlarged cross-sectional view of a part of an optical transceiver according to still another embodiment. Instead of the conductive member 64, a conductive member 64A shown in FIG. 15 can be used. The conductive member 64A includes a portion 64a along the end surface of the edge portion 16b of the circuit board 16, and portions 64b and 64c along the top and bottom surfaces. A plurality of leaf spring-like fingers 64d protrude upward from the portion 64b, and a plurality of leaf spring-like fingers 64e protrude downward from the portion 64c. As shown in FIG. 16, when the conductive member 64 </ b> A is attached to both edge portions 16 b of the circuit board 16, the finger 64 d comes into contact with the first housing portion 48 and the finger 64 e comes into contact with the second housing portion 50. . Therefore, the conductive member 64 </ b> A can exhibit a function as an elastic member for elastically supporting the circuit board 16 by the housing 20. The conductive member 64 </ b> A can also provide a frame ground potential to both edge portions 16 b of the circuit board 16.

  DESCRIPTION OF SYMBOLS 10 ... Optical transceiver, 16 ... Circuit board, 16a ... Card edge connector, 16b ... Edge, 16c ... Ground pattern, 16d ... Via electrode, 18 ... Optical receptacle assembly, 20 ... Housing, 22 ... Shield sheet, 24 ... Front cover , 26 ... Optical multiplexer, 28 ... Optical demultiplexer, 30 ... Plug connector, 30a ... Electrical connector portion, 30b ... Socket portion, 30c ... Projection, 30d ... Raised portion, 32 ... Plug holder, 32a ... Top plate portion, 32a ... Side plate portion, 32c ... first pressing portion, 32d ... second pressing portion, 32e ... convex piece, 34 ... gasket (second elastic member), 36 ... gasket (first elastic member), 38 ... front tray, 40 ... Rear tray 42 ... Connector 44 ... Holder 48 ... First housing part 50 ... Second housing part

Claims (12)

A plurality of optical subassemblies including an optical transmission subassembly for converting electrical signals to optical signals, and an optical receiving subassembly for converting optical signals to electrical signals;
A circuit board electrically connected to the plurality of optical subassemblies, the circuit board having a card edge connector;
A housing provided to cover the plurality of optical subassemblies and the circuit board;
An electrical connector portion, and a plug connector having a socket portion into which the card edge connector is inserted and electrically connected to the electrical connector portion;
An elastic member provided between the housing and the circuit board;
With
The plug connector is fixed to the housing;
The circuit board is supported by the housing via the elastic member.
Optical transceiver. The housing includes a first housing part and a second housing part that are separable from each other in a first direction orthogonal to the board surface of the circuit board,
The first housing part covers the circuit board from one side in the first direction, and the second housing part covers the circuit board from the other side in the first direction,
The plug connector is sandwiched between the first housing part and the second housing part,
The optical transceiver according to claim 1. The plug connector includes a pair of ridges extending in a second direction that is parallel to the substrate surface of the circuit board and intersects the first direction, and one of the pair of ridges is , Projecting to one side in the first direction, the other of the pair of raised portions projecting to the other side in the first direction,
The first housing portion and the second housing portion are respectively formed with recesses into which the pair of raised portions are fitted.
The optical transceiver according to claim 2. A plug holder provided along the raised portion so as to be interposed between the raised portion and the housing in the concave portion;
The plug holder includes a first pressing portion that presses the plug connector in a third direction that intersects the first direction and the second direction.
The optical transceiver according to claim 3. The plug holder has a second pressing portion that presses the plug connector in the first direction.
The optical transceiver according to claim 4.   The optical transceiver according to claim 4, wherein the plug holder includes a protrusion for enabling identification of the orientation of the plug holder. The elastic member is provided along both edges of the circuit board extending in the third direction on a pair of board surfaces of the circuit board.
The optical transceiver as described in any one of Claims 2-6. The elastic member and the housing have conductivity,
The circuit board has a plurality of ground patterns provided on both edges of the pair of substrate surfaces, and connects two ground patterns opposed to each other in the first direction among the plurality of ground patterns. Having a via electrode to
The optical transceiver according to claim 7.   The optical transceiver according to claim 7, further comprising a conductive component provided so as to cover the both edges of the circuit board. The elastic member is a first elastic member along one side of the circuit board, the first elastic member provided between the first housing portion and the one side of the board; A second elastic member along the other substrate surface of the circuit board, and the second elastic member provided between the second housing portion and the other substrate surface,
The second elastic member includes a portion extending along a peripheral edge portion of the second housing other than a region where the circuit board is mounted, and the first housing, the second housing, Being pinched by
The optical transceiver according to any one of claims 2 to 9. The first housing portion includes a portion adjacent to the other surface of the circuit board;
The portion of the second elastic member extending along the peripheral edge of the second housing is sandwiched between the second housing and the portion of the first housing;
The adjacent portion is along a plane including the other substrate surface of the circuit board,
The optical transceiver according to claim 10.   The optical transceiver according to any one of claims 1 to 11, wherein a groove for fitting the elastic member is formed in the housing.

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