JP2011232701A - Optical transceiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical transceiver having an electromagnetic shielding capability between an optical receptacle and a housing.SOLUTION: An optical transceiver 10 comprises an optical receptacle 18 and a circuit board 16 provided in a housing 48, 50. The optical receptacle 18 includes a rear wall part. The rear wall part is in contact with a sleeve flange. The housing 48, 50 has a first wall which defines a portion mounted with the optical receptacle 18. A shield sheet 22 having elasticity and conductivity is held between the rear wall part of the optical receptacle 18 and the first wall of the housing 48, 50. A front cover 24 fixed to the housing 48, 50 has a pressing part which presses the optical receptacle 18 to the first wall of the housing 48, 50.

Description

  The present invention relates to an optical transceiver.

  As optical transceivers, optical transceivers described in Patent Documents 1 to 3 below are known. The optical transceivers described in these documents include an optical transmission subassembly, an optical reception subassembly, a circuit board, an optical receptacle, and a housing.

  The optical transmitter subassembly and the optical receiver subassembly are electrically connected to the circuit board. The housing is mounted so as to cover the optical transmission subassembly, the optical reception subassembly, and the circuit board. The optical receptacle is a component for optically coupling the optical transmission subassembly and the optical reception subassembly to the optical connector plug from the outside, and accommodates the sleeves of the optical transmission subassembly and the optical reception subassembly, It is attached to the housing.

  In these optical transceivers, the optical receptacle is a resin member subjected to metal plating for electromagnetic shielding.

US Pat. No. 6,085,006 US Pat. No. 7,195,403 JP 2008-250560 A

  By the way, an optical receptacle such as an SC type optical receptacle has a latch structure with which an optical connector plug is engaged. In this case, the optical receptacle is preferably made of a resin having no metal plating from the viewpoint of the strength and cost of the latch. Further, even an optical transceiver having a resin-made optical receptacle is required to have an electromagnetic shielding function between the optical receptacle and the housing.

  An object of the present invention is to provide an optical transceiver having an optical receptacle made of resin and having electromagnetic shielding performance between the optical receptacle and a housing.

  An optical transceiver according to an aspect of the present invention includes a plurality of optical subassemblies, a circuit board, an optical receptacle assembly, and a housing. The plurality of optical subassemblies includes a plurality of optical transmission subassemblies that convert electrical signals into optical signals and a plurality of optical reception subassemblies that convert optical signals into electrical signals. The circuit board is electrically connected to the plurality of optical subassemblies. The optical receptacle assembly has a plurality of sleeves and an optical receptacle. The plurality of sleeves are members for optically coupling the optical connector plug from the outside and the optical subassembly. The optical receptacle is a resin member that defines a space for receiving a plurality of sleeves and an optical connector plug. The housing has, in order in the first direction, an optical receptacle mounting portion for mounting an optical receptacle and a circuit board mounting portion for mounting a circuit board. The sleeve is a cylindrical member extending in the first direction. The plurality of sleeves include a first portion, a flange, and a second portion in order in the first direction. The diameter of the flange is larger than the diameter of the first part and the diameter of the second part. The optical receptacle includes a rear wall portion provided along a plane intersecting the first direction. A flange abuts on the rear wall. The rear wall is provided with a hole that leads to the space of the optical receptacle and a recess in which a flange fits around the hole. The housing has a first wall that defines an optical receptacle mounting portion. The first wall is provided along a plane that intersects the first direction. The optical transceiver further includes a shield sheet and a front cover. The shield sheet has elasticity and conductivity, and is sandwiched between the rear wall portion of the optical receptacle and the first wall of the housing. The front cover is formed with an opening for exposing the opening end (opening end for inserting the optical connector plug) of the space of the optical receptacle. The front cover has a pressing portion that is fixed to the housing and presses the optical receptacle toward the first wall of the housing.

  According to this optical transceiver, since the shield sheet is sandwiched between the rear wall portion of the optical receptacle and the first wall of the housing, an electromagnetic shielding function is provided between the optical receptacle and the housing.

  In one embodiment, the housing may include a pair of second walls that define the optical receptacle mounting portion from a second direction orthogonal to the first direction. Each may have a groove, and the optical receptacle may include a pair of side walls facing the pair of second walls, and the optical receptacle is a pair of side walls formed on the pair of side walls. A pair of pressing portions that are inserted into the grooves of the second wall and press the optical receptacle toward the first wall of the housing in contact with a surface defining the grooves. May be. According to the optical transceiver of this embodiment, before the optical receptacle is fixed to the housing by the force exerted by the front cover, the optical receptacle is attached to the housing by inserting the pressing portion into the groove of the second wall. Can be temporarily fixed. Therefore, the productivity of the optical transceiver is improved.

  In one embodiment, the pair of pressing portions of the optical receptacle may include a spring structure that can swing or pivot about an axis extending in the second direction. Further, in one embodiment, the pair of pressing portions of the optical receptacle may include a portion that deforms in contact with the surfaces defining the pair of grooves.

  In one embodiment, the above-mentioned two grooves formed in the pair of second walls may be provided at different positions in the first direction. In this case, the pair of pressing portions of the optical receptacle can be formed at positions corresponding to the two grooves in the pair of side wall portions. According to such an optical transceiver, an error in the mounting direction of the optical receptacle with respect to the housing is prevented.

  In one embodiment, the shield sheet may be formed with a hole into which the flange is fitted, and in the state before the flange is fitted into the hole in the shield sheet, the diameter of the hole in the shield sheet may be smaller than the diameter of the flange. Good. According to the optical transceiver of this embodiment, the degree of adhesion of the shield sheet to the sleeve is increased, and as a result, the electromagnetic shielding performance is further improved.

  In one embodiment, the shield sheet may be a conductive nonwoven fabric. In one embodiment, the shield sheet is composed of a rubber sheet and a conductive sheet, and the conductive sheet may abut against the first wall of the housing.

  In one embodiment, the rear wall portion of the receptacle may include a raised portion that protrudes in the first direction on the surface with which the shield sheet abuts. According to the optical transceiver of this form, the shield sheet and the first wall of the housing are more securely adhered, and as a result, the electromagnetic shielding performance is further improved.

  In one embodiment, the housing can mount an SC-type optical receptacle and an LC-type optical receptacle interchangeably as an optical receptacle, and the SC-type optical receptacle and the LC-type optical receptacle are paired as sleeves. The first wall of the housing has a pair of first grooves through which a second portion of the pair of sleeves of the SC type optical receptacle passes, and a pair of LC type optical receptacles. A pair of second grooves through which the second portion of the sleeve passes may be formed. Since the optical transceiver described above includes the optical receptacle as a component separate from the housing, the SC-type optical receptacle and the LC-type optical receptacle are formed by forming the first groove and the second groove in the housing. It is possible to replaceably mount the housing.

  In one embodiment, the housing may include a first housing part and a second housing part separable in a third direction orthogonal to the first direction and the second direction, The housing part covers the circuit board and the optical receptacle from one side in the third direction, and the second housing part covers the circuit board and the optical receptacle from the other side in the third direction. A conductive gasket sandwiched between the housing portion and the second housing portion may be further provided, and the gasket may extend so as to contact the shield sheet. Thus, even if the housing is separated into two parts, it is possible to maintain the electromagnetic shielding performance between the housing and the optical receptacle by the gasket contacting the shield sheet.

  In one embodiment, the optical receptacle includes an upper wall portion and a lower wall portion intersecting with the third direction, and at least one of the upper wall portion and the lower wall portion is formed of the first housing portion and the second wall portion. A plurality of protrusions may be included that are deformed by being held between the housing portion and the housing portion. According to the optical transceiver of this embodiment, the optical receptacle is more firmly fixed at the optical receptacle mounting portion.

  As described above, according to the present invention, an optical transceiver having a resin optical receptacle and having electromagnetic shielding performance between the optical receptacle and the housing 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. It is a perspective view of the 1st housing part concerning one embodiment. It is the top view which looked at some 1st housing parts concerning one embodiment from the front. It is a perspective view which shows the optical receptacle assembly which concerns on one Embodiment. It is a perspective view of the sleeve which concerns on one Embodiment. It is a perspective view of the optical receptacle and shield sheet concerning one embodiment. It is a perspective view which shows the process of incorporating an optical receptacle assembly in the 1st housing part. It is a perspective view of the front cover concerning one embodiment. It is a perspective view of the 2nd housing part and gasket concerning one embodiment. It is a top view which removes the 2nd housing part and shows the part of the front side of the optical transceiver which concerns on one Embodiment. It is sectional drawing which follows the XIII-XIII line | wire of FIG. It is a perspective view which shows another optical receptacle assembly which may be mounted in the optical transceiver of one Embodiment. It is a perspective view which shows the optical receptacle which concerns on another embodiment. It is a perspective view which shows the optical receptacle which concerns on another embodiment. It is a top view which shows the part of the front side of the optical receptacle which concerns on another embodiment by removing the 2nd housing part. It is a side view which shows the shield sheet 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 the direction, and the direction in which the housing optical receptacle mounting area for mounting the optical receptacle is located with respect to the circuit board mounting area of the optical transceiver housing on which the circuit board is mounted. And “back” is used as a word indicating the opposite direction. Further, the front-rear direction may be referred to as a first direction. Further, the “second direction” is used as a word indicating a direction intersecting the front-rear direction (first direction) and in which the optical transmission subassembly and the optical reception subassembly are arranged. In addition, “third direction” is used as a word indicating a direction intersecting the first direction and the second direction. The third direction is sometimes 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, an optical receptacle assembly 18, a housing 20, a shield sheet 22, and a front cover. 24.

  In one embodiment, the optical transceiver 10 includes an optical multiplexer 26, an optical demultiplexer 28, a plug connector 30, a pair of plug holders 32, a gasket 34, a pair of gaskets 36, a front tray 38, a rear tray 40, a connector 42, A holder 44 and a screw 46 may be provided.

  The optical transceiver 10 is used by connecting the electrical connector 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 at the rear end. The card edge connector is inserted into the socket of the plug connector 30 and is electrically connected to the electrical connector of the plug connector 30. The electrical connector of the plug connector 30 is connected to the electrical connector socket of the host system.

  The plug connector 30 is fixed to the housing 20 via a pair of plug holders 32. 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 (third 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. FIG. 5 is a plan view of a part of the first housing portion according to the embodiment as viewed from the front.

  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 first 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 FIGS. 4 and 5, 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 first 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 first direction. The other of the first grooves GS2 and the groove GF5 are provided along another straight line extending in the first direction.

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

  FIG. 6 is a perspective view showing an optical receptacle assembly according to an embodiment. FIG. 6A shows a perspective view of the optical receptacle assembly 18 as seen from the rear, and FIG. 6B shows a perspective view of the optical receptacle assembly 18 as seen from the front. Yes. As shown in FIG. 6, the optical receptacle assembly 18 includes an optical receptacle 52, a shield sheet 22, and a sleeve 54.

  FIG. 7 is a perspective view of a sleeve according to an embodiment. As shown in FIGS. 6 and 7, the sleeve 54 is a member provided at the tip 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 first 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.

  As shown in FIG. 7, the sleeve 54 has a first portion 54a, a flange 54b, and a second portion 54c in order from the front side. The flange 54b is a portion having a diameter larger than that of the first portion 54a and the second portion 54c.

  FIG. 8 is a perspective view of an optical receptacle and a shield sheet according to an embodiment. The optical receptacle 52 is a resin part. As shown in FIGS. 6 and 8, the optical receptacle 52 defines two spaces for coupling the optical connector plug and the first portion 54 a of the sleeve 54. The optical receptacle 52 has a plurality of walls that define these spaces. In particular, the optical receptacle 52 includes a rear wall portion 52a that intersects the first direction.

  The front wall of the flange 54b of the sleeve 54 abuts on the rear wall 52a. In one embodiment, the rear wall 52a is formed with two holes 52e that communicate with the space described above. The rear wall 52a is formed with a recess 52f into which the flange 54b is fitted around these holes 52e. A portion of the flange 54b on the front side in the first direction is fitted in the recess 52f.

  The shield sheet 22 is attached to the rear wall portion 52a. The shield sheet 22 is a sheet-like member having conductivity and elasticity. The shield sheet 22 may be a conductive nonwoven fabric, for example.

  The optical receptacle assembly 18 configured as described above is mounted in the optical receptacle mounting region R4 as shown in FIG. More specifically, the second portion 54c 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 the optical transceiver 10, the shield sheet 22 is sandwiched between the rear wall portion 52 a of the optical receptacle 52 and the first wall W 1 of the first housing portion 48. More specifically, 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 a screw 60, so that the optical receptacle 52 faces the first wall W1. Pressed. Thereby, the shield sheet 22 is held between the rear wall portion 52 a of the optical receptacle 52 and the first wall W <b> 1 of the first housing portion 48.

  FIG. 10 is a perspective view of a front cover according to an embodiment. As shown in FIG. 10, the front cover 24 is formed with a port (opening) 24 a for exposing the opening end of the above-described space of the optical receptacle 52. The front cover 24 is formed with a hole 24b through which the screw 60 is passed and a hole 24c through which the screw 46 is passed. Further, the front cover 24 has a pressing portion 24d for pressing the optical receptacle 52 toward the first wall W1.

  In one embodiment, as shown in FIG. 10, the pressing portion 24d may be a pair of claws extending rearward, and may be provided on both sides of the port 24a. On the other hand, both side walls 52b of the optical receptacle 52 may have a surface 52d with which the tip of the claw 24d abuts, as shown in FIG. In this case, the optical receptacle 52 is pressed toward the first wall W1 by the tip of the claw 24d coming into contact with the surface 52d.

  As a result, the rear surface of the flange 54b comes into contact with the wall W1 of the first housing portion 48, and the shield sheet 22 is attached to the rear wall portion 52a of the optical receptacle 52 and the first housing portion 48. It is sandwiched between the wall W1. As a result, the generation of a gap between the first housing portion 48 and the optical receptacle assembly 18 is reduced by the conductive shield sheet 22, and the leakage of electromagnetic waves through the gap is reduced.

  In one embodiment, as shown in FIG. 8, the shield sheet 22 has a hole 22a into which the flange 54b is inserted. In a state before the flange 54b is inserted, the diameters of these holes 22a are smaller than the diameter of the flange 54b. Thereby, the shield sheet 22 reduces the generation of a gap between the shield sheet 22 and the flange 54b. As a result, leakage of electromagnetic waves through the gap is reduced.

  In one embodiment, as shown in FIG. 6, the optical receptacle 52 may further include a pair of pressing portions 52c. The pair of pressing portions 52c is supported by the pair of side wall portions 52b. In one embodiment, as shown in FIG. 6, the pressing portion 52 c may have a spring structure supported by the side wall portion 52 b so as to be swingable or pivotable about the axis extending in the second direction.

  Correspondingly, grooves GR are formed in the pair of second walls W2 of the first housing portion 48 as shown in FIG. When the pressing portion 52c is inserted into the groove GR, the pressing portion 52c comes into contact with the surface of the second wall W2 defining the groove GR and is urged rearward by the surface. Thereby, the pressing part 52c exhibits the force which presses the optical receptacle 52 toward the 1st wall W1. As a result, when the optical receptacle assembly 18 is mounted on the first housing portion 48, the optical receptacle 52 is temporarily fixed by the force exerted by the pressing portion 52c. Therefore, handling of the first housing part 48 assembled with the optical receptacle 52 is facilitated.

  As shown in FIG. 8, the rear wall portion 52a of the optical receptacle 52 has a raised portion 52g that protrudes rearward around the hole 52e and the recessed portion 52f. The raised portion 52g allows the shield sheet 22 to be more firmly attached to the rear wall portion 52a of the optical receptacle 52 and the first wall W1 of the first housing portion 48.

  Reference is now made to FIGS. FIG. 11 is a perspective view of a second housing portion and a gasket according to an embodiment. FIG. 12 is a plan view showing the front side portion of the optical transceiver according to the embodiment with the second housing portion removed. 13 is a cross-sectional view taken along line XIII-XIII in FIG.

  A second housing portion 50 shown in FIG. 11 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. 11, the second housing part 50 includes a main part 50 a extending in the first direction and the second direction. In one embodiment, the gasket 34 is attached to the main portion 50a along the periphery of the main portion 50a. The gasket 34 is a member having elasticity and conductivity. For example, the gasket 34 may be a rubber tube whose surface is metal-plated or a rubber tube in which a conductive material is blended.

  In the form shown in FIG. 11, 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 11, the 2nd housing part 50 can have a plurality of bosses 50b projected in the 3rd direction. The plurality of bosses 50b can be provided along a path through which the gasket 34 passes. These bosses 50b facilitate the handling of the second housing part 50 to which the gasket 34 is attached.

  When the first housing part 48 and the second housing part 50 are assembled together, the gasket 34 is sandwiched between the first housing part 48 and the second housing part 50. In this state, as shown in FIG. 12, the gasket 34 is positioned on a path surrounding the periphery of the optical receptacle mounting region R4. Further, as shown in FIG. 13, the gasket 34 contacts the shield sheet 22 on the rear side of the optical receptacle mounting region R4. This provides better electromagnetic shielding performance between the optical receptacle mounting region R4 and the other region defined by the housing 20.

  In one embodiment, as shown in FIG. 4, the first housing portion 48 can provide grooves GG at both edges of the third region R3. A pair of gaskets 36 can be mounted in the groove GG. The pair of gaskets 36 may be members having conductivity and elasticity. For example, the gasket 36 may be a rubber tube whose surface is metal-plated or a rubber tube in which a conductive material is blended. In this configuration, at both edges of the circuit board 16, the gasket 34 is in contact with the board surface on one side, and the gasket 36 is in contact with the board surface on the other side. That is, the circuit board 16 is sandwiched and supported by the first housing portion 48 and the second housing portion 50 via the gaskets 34 and 36. In such a configuration, ground patterns may be provided on both board surfaces at both edges of the circuit board 16 and the ground patterns may be connected by via electrodes. In this case, a circuit board 16 is provided with a Grame ground electrically connected to the housing 20.

  Reference is now made to FIG. FIG. 14 is a perspective view showing another optical receptacle assembly that can be mounted on the optical transceiver of one embodiment. The optical transceiver 10 may be mounted with an optical receptacle assembly 18 having an LC type optical receptacle shown in FIG. 14 instead of the optical receptacle assembly having the SC type optical receptacle described above. The LC type optical receptacle can latch the LC type optical connector plug.

  The pitch between two optical fibers in an LC type optical connector plug is narrower than the pitch between two optical fibers in an SC type optical connector plug. Therefore, the pitch of the two spaces in the LC type optical receptacle 52 (the space for receiving the sleeve 54 and the optical connector) is narrower than the pitch of the two spaces of the SC type optical receptacle. Similarly, the pitch between the two sleeves 54 attached to the LC type optical receptacle 52 is narrower than the pitch between the two sleeves 54 attached to the SC type optical receptacle 52.

  In the optical transceiver 10, two first grooves GS1 through which the second portions 54c of the two sleeves 54 attached to the SC type optical receptacle 52 pass are formed in the first wall W1 of the first housing portion 48. Is formed. The first housing portion 48 is formed with grooves GF2 and GF5 through which the optical fibers F2 and F4 extending from the two sleeves 54 attached to the SC type optical receptacle 52 are passed. One of the first grooves GS1 and the groove GF2 are provided along a straight line extending in the first direction, and the other of the first grooves GS1 and the groove GF5 are along a straight line extending in the first direction. Is provided.

  Further, two second grooves GS2 through which the second portions 54c of the two sleeves 54 attached to the LC type optical receptacle 52 pass are formed in the first wall W1. Further, the first housing portion 48 is formed with grooves GF3 and GF6 through which optical fibers F2 and F4 extending from two sleeves 54 attached to the LC type optical receptacle 52 are passed. One of the second grooves GS2 and the groove GF3 are provided along a straight line extending in the first direction, and the other of the second grooves GS2 and the groove GF6 are along a straight line extending in the first direction. Is provided.

  Therefore, regardless of whether the LC type optical receptacle or the SC type optical receptacle is selected, the optical fibers F2 and F4 are accommodated in the groove of the first housing portion 48 without causing excessive bending of the optical fiber. be able to.

  Although the optical transceiver according to the embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and various modifications can be made. 15 and 16 are perspective views showing an optical receptacle according to another embodiment. The optical receptacle 52A shown in FIGS. 15 and 16 differs from the optical receptacle 52 in the configuration of the pressing portion 52c and the raised portion 52g.

  In the optical receptacle 52A, when the pressing portion 52c is accommodated in the groove GR, the pressing portion 52c has a shape that can be deformed in contact with a surface defining the groove GR. Specifically, the pressing portion 52c includes a shape portion whose width becomes narrower toward the front side. In this case, when the pressing portion 52c is accommodated in the groove GR, the tip of the shape portion abuts against a surface defining the groove GR and is crushed, so that the optical receptacle 52A is directed toward the first wall W1. A pressing force is generated.

  In the optical receptacle 52A, a plurality of protrusions are provided around the hole 52e and the recess 52f as the raised portion 52g.

  Further, in the optical receptacle 52A, a plurality of minute protrusions 52h are provided on the upper and lower wall portions of the optical receptacle 52A. When the optical receptacle 52A is sandwiched between the first housing portion 48 and the second housing portion 50, the microprojections 52h are crushed, so that the optical receptacle 52A is connected to the first housing portion 48 and the second housing portion 48. It will be more firmly held between the housing part 50.

  FIG. 17 is a plan view showing a front portion of an optical receptacle according to another embodiment, with the second housing portion removed. As shown in FIG. 17, the pair of grooves GR may be provided at different positions in the first direction. Correspondingly, the pair of pressing portions 52c may be provided at different positions in the first direction. With this configuration, it is possible to prevent an error in the direction in which the optical receptacle 52 is mounted on the first housing portion 48.

  FIG. 18 is a side view showing a shield sheet according to another embodiment. As shown in FIG. 18, the shield sheet 22 may be configured by superposing a rubber sheet 22b and a conductive sheet 22c. In this case, the shield sheet 22 is attached to the optical receptacle so that the sheet 22c comes into contact with the first wall W1.

  DESCRIPTION OF SYMBOLS 10 ... Optical transceiver, 12 ... Optical transmission subassembly (TOSA), 14 ... Optical reception subassembly (ROSA), 16 ... Circuit board, 18 ... Optical receptacle assembly, 20 ... Housing, 22 ... Shield sheet, 24 ... Front cover, 24d ... Pressing part, 26 ... Optical multiplexer, 28 ... Optical demultiplexer, 30 ... Plug connector, 32 ... Plug holder, 34 ... Gasket, 36 ... Gasket, 38 ... Front tray, 40 ... Rear tray, 42 ... Connector, 44 ... Holder 48 ... first housing part, 50 ... second housing part, 52 ... optical receptacle, 52a ... rear wall part, 52b ... side wall part, 52c ... pressing part, 52e ... hole, 52f ... recessed part, 52g ... raised part 54 ... Sleeve 54a ... First part 54b ... Flange 54c ... Second part G ... groove (groove into which the pressing portion 52c is inserted), GS1 ... groove (groove for sleeve of SC type optical receptacle assembly), GS2 ... groove (groove for sleeve of LC type optical receptacle assembly), W1 ... first Wall, W2 ... Second wall.

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;
A plurality of sleeves for optically coupling an optical connector plug from the outside and the plurality of optical subassemblies, and a resin optical receptacle defining a space for receiving the plurality of sleeves and the optical connector plug An optical receptacle assembly having:
In order in the first direction, an optical receptacle mounting portion for mounting the optical receptacle, and a housing having a circuit board mounting portion for mounting the circuit board;
An optical transceiver comprising:
The plurality of sleeves are cylindrical members extending in the first direction, and include a first portion, a flange, and a second portion in order in the first direction. Larger than the diameter of the first part and the diameter of the second part,
The optical receptacle is a rear wall portion provided along a plane intersecting the first direction, and has the rear wall portion with which the flange abuts, and the rear wall portion includes the rear wall portion of the optical receptacle. A hole communicating with the space, and a recess into which the flange fits around the hole;
The housing has a first wall that is provided along a surface that defines the optical receptacle mounting portion and intersects the first direction;
The optical transceiver is
A shield sheet having elasticity and conductivity, the shield sheet sandwiched between the rear wall portion of the optical receptacle and the first wall of the housing;
An opening for exposing the opening end of the space of the optical receptacle is formed, and the front cover is fixed to the housing, and presses the optical receptacle toward the first wall of the housing. The front cover having a pressing portion;
Further comprising
Optical transceiver. The housing has a pair of second walls that define the optical receptacle mounting portion from a second direction orthogonal to the first direction;
A groove is formed in each of the pair of second walls,
The optical receptacle includes a pair of side wall portions facing the pair of second walls,
The optical receptacle is a pair of pressing portions formed on the pair of side wall portions, and is inserted into the groove of the second wall, and comes into contact with a surface defining the groove to place the optical receptacle in the housing A pair of pressing portions that press toward the first wall of
The optical transceiver according to claim 1.   The optical transceiver according to claim 2, wherein the pair of pressing portions of the optical receptacle includes a spring structure that can swing or pivot about an axis extending in the second direction.   The optical transceiver according to claim 2, wherein the pair of pressing portions of the optical receptacle includes a portion that deforms in contact with surfaces defining the pair of grooves.   5. The optical transceiver according to claim 2, wherein the two grooves formed in the pair of second walls are provided at different positions in the first direction. 6. The shield sheet has a hole into which the flange fits,
The optical transceiver according to claim 1, wherein a diameter of the hole of the shield sheet is smaller than a diameter of the flange in a state before the flange is fitted into the hole of the shield sheet.   The optical transceiver according to claim 1, wherein the shield sheet includes a conductive nonwoven fabric.   The said shield sheet | seat is comprised from the sheet | seat made from rubber | gum, and an electroconductive sheet, This electroconductive sheet contact | abuts to the said 1st wall of the said housing. The described optical transceiver.   The optical transceiver according to any one of claims 1 to 8, wherein the rear wall portion of the receptacle includes a raised portion that protrudes in the first direction on a surface with which the shield sheet abuts. As the optical receptacle, the housing can be mounted with an SC-type optical receptacle and an LC-type optical receptacle interchangeably,
The SC-type optical receptacle and the LC-type optical receptacle have a pair of sleeves as the sleeves,
The first wall of the housing has a pair of first grooves through which the second portion of the pair of sleeves of the SC-type optical receptacle passes, and the pair of sleeves of the LC-type optical receptacle A pair of second grooves through which the second portion passes are formed,
The optical transceiver according to claim 1. The housing includes a first housing part and a second housing part separable in a third direction orthogonal to the first direction and the second direction,
The first housing part covers the circuit board and the optical receptacle from one side in the third direction, and the second housing part is formed from the other side in the third direction. Covering the receptacle,
The optical transceiver further comprises a conductive gasket sandwiched between the first housing part and the second housing part,
The gasket extends to contact the shield sheet;
The optical transceiver according to claim 1. The optical receptacle includes an upper wall portion and a lower wall portion intersecting with the third direction,
At least one of the upper wall portion and the lower wall portion includes a plurality of protrusions that are deformed by being sandwiched between the first housing portion and the second housing portion.
The optical transceiver according to claim 1.

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