CN223066492U - Board-to-Board Connectors - Google Patents

Abstract

The utility model discloses a board-to-board connector, which comprises a plug connector and a socket connector which are matched with each other, wherein the plug connector comprises a plug body and plug terminals, the plug body is provided with two longitudinally extending side walls, the plug terminals comprise a first terminal and a second terminal which are fixedly held on the side walls, the socket connector comprises a socket body and socket terminals, the socket body is provided with an island part, two side parts positioned at two sides of the island part and two end parts connected to the two side parts so as to jointly limit a socket slot, and the socket terminals comprise positive terminals and reverse terminals with the same structure. The first terminal is provided with a first contact groove positioned on the outer side of the side wall, the second terminal is provided with a second contact groove positioned on the inner side of the side wall, and the socket terminal is provided with a locking part protruding into the socket slot. When the plug connector is matched with the socket connector, the locking part of the forward terminal is buckled on the first contact groove, the locking part of the reverse terminal is buckled on the second contact groove, and the above matching realizes structural dislocation so as to ensure the extraction force and have better hand feeling rate.

Description

Board-to-board connector

Technical Field

The present utility model relates to the field of board-to-board connectors, and more particularly, to a board-to-board connector with stable connection.

Background

Electrical connectors are necessary for making electrical connections and signal transfer between devices, assemblies and components, systems and systems, and form a fundamental component of a complete system. At present, the electric connector is widely applied to various electronic products. Board-to-board connectors (Board to Board Connector, BTB for short) are used to electrically connect two mutually parallel circuit boards, which typically include a plug connector and a receptacle connector that mate with each other. The plug connector and the socket connector respectively comprise an insulating body and a conductive terminal, wherein the insulating body mainly plays a role in insulating and positioning the conductive terminal, and the conductive terminal mainly plays a role in conducting. The plug terminal fixed on the insulation body of the plug connector is only provided with a contact groove on the outer side of the side wall, namely the plug terminal is not provided with the contact groove on the inner side of the side wall, so that the pull-out force provided between the plug terminal and the socket terminal is smaller and poorer in hand feeling rate after the plug connector is matched with the socket connector, thereby being unfavorable for the application of the board-to-board connector.

It is therefore desirable to provide a new board-to-board connector that overcomes the above-mentioned drawbacks.

Disclosure of utility model

The utility model aims to provide a board-to-board connector which has larger pull-out force and better hand feeling rate when being buckled.

The plug connector comprises a plug body and plug terminals fixed on the plug body, wherein the plug body is provided with two side walls extending along the longitudinal direction and two end walls connected with the two side walls, the plug terminals comprise a first terminal and a second terminal fixed on the side walls, and the first terminal and the second terminal on each side wall are arranged at intervals along the longitudinal direction. The socket connector comprises a socket body and socket terminals fixedly held on the socket body, wherein the socket body is provided with a central island part extending longitudinally, two side parts positioned at two lateral sides of the island part and two end parts connected with the two side parts, the island part, the two side parts and the two end parts jointly define a socket slot, the socket terminals are arranged in two rows longitudinally and comprise forward terminals and reverse terminals with the same structure, and the forward terminals and the reverse terminals in each row of the socket terminals are arranged at intervals longitudinally. The first terminal is provided with a first contact groove positioned on the lateral outer side of the side wall, the second terminal is provided with a second contact groove positioned on the lateral inner side of the side wall, the socket terminal is provided with a locking part protruding into the socket slot, when the plug connector is matched with the socket connector, the locking part of the forward terminal is buckled with the first contact groove of the first terminal, and the locking part of the reverse terminal is buckled with the second contact groove of the second terminal.

In a preferred embodiment, the socket terminal is provided with a fixing portion held on the side portion or the island portion, a U-shaped elastic portion extending from a top of the fixing portion into the socket slot, and a welding foot extending in a lateral direction from a bottom of the fixing portion, the locking portion being located on a side of the U-shaped elastic portion adjacent to the fixing portion.

In a preferred embodiment, the island is provided with a vertically penetrating elongated slot, the fixing portion of the forward terminal is held on the side portion, the soldering leg of the forward terminal extends out of the socket body in a lateral direction, the fixing portion of the reverse terminal is held on the island, and the soldering leg of the reverse terminal extends into the slot in a lateral direction.

In a preferred embodiment, the first terminal is provided with a first inner wall contact portion located on an inner wall surface of the side wall, a first outer wall contact portion located on an outer wall surface of the side wall, and a first connection portion connected to top ends of the first inner wall contact portion and the first outer wall contact portion, the first connection portion is located on the top end of the side wall, and the first contact groove is located on the first outer wall contact portion.

In a preferred embodiment, the second terminal is provided with a second inner wall contact portion located on an inner wall surface of the side wall, a second outer wall contact portion located on an outer wall surface of the side wall, and a second connection portion connected to a tip of the second inner wall contact portion and a tip of the second outer wall contact portion, the second connection portion is located on a tip of the side wall, and the second contact groove is located on the second inner wall contact portion.

In a preferred embodiment, the first terminal is provided with a first welded portion extending laterally outwardly from the bottom of the first inner wall contact portion, and the second terminal is provided with a second welded portion extending laterally inwardly from the bottom of the second inner wall contact portion, the first welded portion on each of the side walls being opposite in extending direction from the second welded portion in the lateral direction.

In a preferred embodiment, the side wall and the end wall enclose to form a plug slot, the plug body is provided with a longitudinal raised line protruding upwards from the bottom of the plug slot and a plurality of holes positioned on two lateral sides of the raised line, the holes on two sides of the raised line are staggered in the longitudinal direction, and the second welding part extends into the holes.

In a preferred embodiment, the second terminal is provided with an embedded portion extending outward in the lateral direction from the bottom of the second outer wall contact portion, the embedded portion is embedded in the side wall, and the lateral length of the embedded portion is smaller than the lateral length of the first welding portion.

In a preferred embodiment, the first inner wall contact portion, the first connecting portion and the first outer wall contact portion together form a first inverted U-shaped portion, and the second inner wall contact portion, the second connecting portion and the second outer wall contact portion together form a second inverted U-shaped portion, wherein when the plug connector is mated to the receptacle connector, the first inverted U-shaped portion contacts the U-shaped elastic portion of the forward terminal and the second inverted U-shaped portion contacts the U-shaped elastic portion of the reverse terminal.

In a preferred embodiment, the first contact grooves and the second contact grooves are respectively provided on both lateral sides of the side wall and staggered in the longitudinal direction, and the positive terminals and the locking portions of the negative terminals in each row of the receptacle terminals are staggered in the longitudinal direction.

Compared with the prior art, the socket has the advantages that the first terminal is provided with the first contact groove positioned on the lateral outer side of the side wall, the second terminal is provided with the second contact groove positioned on the lateral inner side of the side wall, and the socket terminal is provided with the locking part protruding into the socket slot. When the plug connector is matched with the socket connector, the locking part of the forward terminal is buckled on the first contact groove of the first terminal, the locking part of the reverse terminal is buckled on the second contact groove of the second terminal, and the plug terminal and the socket terminal are matched to realize structural dislocation so as to ensure larger extraction force, and meanwhile, the locking device has better hand feeling rate.

Drawings

Fig. 1 is a perspective view of a plug connector according to a preferred embodiment of the present utility model.

Fig. 2 is a top view of the plug connector shown in fig. 1.

Fig. 3 is a bottom view of the plug connector shown in fig. 1.

Fig. 4 is an exploded view of the plug connector shown in fig. 1.

Fig. 5 is a front view of the plug terminal in the plug connector shown in fig. 1.

Fig. 6 is a top view of a receptacle connector according to a preferred embodiment of the present utility model.

Fig. 7 is an exploded view of the receptacle connector shown in fig. 6.

Fig. 8 is a perspective view of the receptacle protecting bracket in the receptacle connector shown in fig. 7.

Fig. 9 is a perspective view of the socket protective holder of fig. 8 at another angle.

Fig. 10 is a cross-sectional view of the receptacle connector shown in fig. 6.

Detailed Description

Referring to fig. 1 to 10, a board-to-board connector is disclosed in the preferred embodiment of the present utility model, and the board-to-board connector includes a plug connector 100 and a socket connector 200 that are mated with each other. The plug connector 100 includes an elongated plug body 1O, plug terminals 20 held on the plug body 1O, and plug protection brackets 30 at both longitudinal ends of the plug body 10. The plug body 1O is provided with two side walls 11 extending in the longitudinal direction and two end walls 12 connected to the two side walls 11, the plug terminals 20 are held on the side walls 11, and the plug protection brackets 30 are held on the end walls 12.

As shown in fig. 5, the plug terminal 20 includes a first terminal 21 and a second terminal 22 integrally injection molded on the side wall 11, and the first terminal 21 and the second terminal 22 on each side wall 11 are disposed at a longitudinal interval. Meanwhile, the two side walls 11 are provided with a first terminal 21 and a second terminal 22, respectively, as viewed from the same lateral direction of the plug connector 100.

The first terminal 21 is provided with a first inner wall contact portion 211 located on the inner wall surface of the side wall 11, a first outer wall contact portion 212 located on the outer wall surface of the side wall 11, a first connection portion 213 connected to the top ends of the first inner wall contact portion 211 and the first outer wall contact portion 212, and a first welding portion 214 extending from the bottom of the first inner wall contact portion 211 laterally outward from the plug body 1O. The first connecting portion 213 is located at the top end of the side wall 11, and the first inner wall contact portion 211, the first connecting portion 213, and the first outer wall contact portion 212 together form a first inverted U-shaped portion for contacting with the U-shaped elastic portion 52 of the plug terminal 50 of the socket connector 200.

The second terminal 22 includes a second inner wall contact portion 221 located on the inner wall surface of the side wall 11, a second outer wall contact portion 222 located on the outer wall surface of the side wall 11, a second connection portion 223 connected to the top ends of the second inner wall contact portion 221 and the second outer wall contact portion 222, and a second welding portion 224 extending laterally inward from the bottom of the second inner wall contact portion 221. The second connecting portion 223 is located at the top end of the side wall 11, and the second inner wall contact portion 221, the second connecting portion 223 and the second outer wall contact portion 222 together form a second inverted U-shaped portion for contacting with the U-shaped elastic portion 52 of the plug terminal 50 of the socket connector 200.

Further, the first inner wall contact portion 211 has a smooth contact surface and the first outer wall contact portion 212 has a first contact groove 215, the second outer wall contact portion 222 has a smooth contact surface and the second inner wall contact portion 221 has a second contact groove 225. Meanwhile, the first contact grooves 215 are located at the lateral outer side of the side wall 11, the second contact grooves 225 are located at the lateral inner side of the side wall 11, that is, on the same side wall 11, and the first contact grooves 215 and the second contact grooves 225 are respectively disposed at two lateral sides of the side wall 11 and staggered in the longitudinal direction.

The first welding portion 214 and the second welding portion 224 on each side wall 11 extend in opposite directions in the transverse direction, and the first welding portion 214 and the second welding portion 224 may be fixedly mounted on a circuit board (not shown) electrically connected to the plug connector 100, that is, the first welding portion 214 of the first terminal 21 and the second welding portion 224 of the second terminal 22 are respectively located at two lateral sides of the side wall 11, so as to implement bilateral layout of the welding portions of the plug terminals 20, and solve the short circuit problem when the pitch of the plug terminals 20 at the same side is small.

Specifically, the side wall 11 and the end wall 12 enclose a plug slot 13, the plug body 1O is provided with a longitudinal protrusion 130 protruding upward from the bottom of the plug slot 13 and a plurality of openings 131 located at two lateral sides of the protrusion 130, the openings 131 at two sides of the protrusion 130 are staggered in the longitudinal direction, and the second welding portions 224 extend into the openings 131, so as to facilitate the observation and operation of the second welding portions 224.

The first terminal 21 and the second terminal 22 are different in structure in that the projection of the first connecting portion 213 in the lateral direction is located on the first welding portion 214, and the projection of the second connecting portion 223 in the lateral direction is located outside the second welding portion 224. The second terminal 22 is further provided with an embedded portion 226 extending out of the bottom of the second outer wall contact portion 222 in the lateral direction and out of the plug body 10, the embedded portion 226 is embedded in the side wall 11, and the lateral length of the embedded portion 226 is smaller than the lateral length of the first welding portion 215.

The plug protection bracket 30 is integrally injection molded on the end wall 12 and covers the end wall 12 and at least part of the side wall 11, thereby improving the strength of the plug body 1O and avoiding the damage to the plug body 10 when the plug connector 100 is plugged and unplugged. The plug protecting bracket 30 is formed by drawing a metal member and is provided with a top shielding portion 31 covering the top surface of the end wall 12, side shielding portions 32 extending from both lateral sides of the top shielding portion 31 in a downward bending manner, and an outer wall shielding portion 33 extending from the outer side of the top shielding portion 32 in a downward bending manner. The side shielding part 32 at least partially covers the lateral outer wall surface of the end part 12, the outer wall shielding part 33 covers the longitudinal outer wall surface of the end part 12, and the top shielding part 31, the side shielding part 32 and the outer wall shielding part 33 form a seamless connection.

The plug protecting bracket 30 is further provided with an inner wall shielding portion 34 extending from the inner side of the top shielding portion 32 in a longitudinal direction to be bent downward, and an extending portion 35 extending from the bottom side of the side shielding portion 32 in a lateral direction. The inner wall shielding portion 34 at least partially covers the longitudinal inner wall surface of the end portion 12 and does not extend beyond the longitudinal inner wall surface of the end portion 12, and the extending portion 35 may be fixedly mounted on a circuit board (not shown) electrically connected to the plug connector 100.

Referring to fig. 6 to 10, the socket connector 200 includes an elongated socket body 40, socket terminals 50 fixed to the socket body 40, and socket protection brackets 60 disposed at two ends of the socket body 50. The socket body 40 is provided with a central island 41 extending in the longitudinal direction, two side portions 42 located at both lateral sides of the island 41, and two end portions 43 connected to the two side portions 42. The island 41, the two sides 42 and the two ends 43 together define a socket slot 44, i.e. the island 41 is located within the socket slot 44, the socket slot 44 being accessible for insertion of the plug connector 100.

As shown in fig. 10, the socket terminals 50 are arranged in two rows in the longitudinal direction and assembled and fixed to the side portions 42 or the island portions 41 of the socket body 40. In this embodiment, the socket terminals 50 include a forward terminal 501 and a reverse terminal 502 with the same structure, and the forward terminal 501 and the reverse terminal 502 in each row of the socket terminals 50 are disposed at intervals in the longitudinal direction. Specifically, the socket terminal 50 is provided with a fixing portion 51 fixed on the side portion 12 or the island portion 11, a U-shaped elastic portion 52 extending from the top of the fixing portion 51 into the socket slot 44, and a soldering leg 53 extending from the bottom of the fixing portion 51 in a lateral direction, wherein the soldering leg 53 can be fixedly mounted on a circuit board (not shown) electrically connected with the socket connector 200.

The island 41 is provided with a longitudinal slot 410 penetrating vertically, the fixing portion 51 of the forward terminal 501 is fixed on the side portion 42, the welding leg 53 of the forward terminal 501 extends out of the socket body 40 along the transverse direction, the fixing portion 51 of the reverse terminal 502 is fixed on the island 41, and the welding leg 53 of the reverse terminal 502 extends into the slot 410 along the transverse direction.

The U-shaped resilient portion 52 is provided with a locking portion 54 on its side adjacent to the fixed portion 51 and a contact arm 55 on its side remote from the fixed portion 51, the locking portion 54 protruding into the socket slot 44. The locking portions 54 of the forward terminals 501 and the reverse terminals 502 in each row of the receptacle terminals 50 are staggered in the longitudinal direction. When the plug connector 100 is mated to the receptacle connector 200, the locking portion 54 of the forward terminal 501 is engaged with the first contact recess 215 of the first terminal 21, and the locking portion 54 of the reverse terminal 502 is engaged with the second contact recess 225 of the second terminal 22. The mating of the plug terminals 20 and the receptacle terminals 50 described above provides structural misalignment to ensure extraction force, while providing a good feel when snapped together.

As shown in fig. 8 and 9, the socket protecting bracket 60 includes an end protecting bracket 70 fixed on the end 43 and an island protecting bracket 80 separately provided from the end protecting bracket 70 for improving the overall strength of the socket connector 200. The end protection bracket 70 is provided with an integrally formed end reinforcing sheet covering the end 43 and a side reinforcing sheet connected to both lateral ends of the end reinforcing sheet and at least partially covering the side 42.

The end reinforcing sheet is provided with an end top plate 71 covering the top surface of the end 43, an end side plate 72 extending from the outer side of the end top plate 71 in the longitudinal direction in a downward bending manner, and an elastic fastening portion 73 extending from both sides of the end side plate 72 in the lateral direction in an inward direction. The end side plate 72 is shielded on the outer wall surface of the end 42 and has an end welding tab 721 at the bottom side thereof, the end welding tab 721 is fixedly mounted on a circuit board electrically connected to the socket connector 200, and the elastic latching portion 73 extends into the socket slot 44 to be latched to the side shielding portion 32 of the plug protecting bracket 30 of the plug connector 100.

The side wall reinforcing sheet is provided with a side top plate 74 covering the top surface of the side portion 42 and a side plate 75 extending from the lateral outside of the side top plate 74 in a downward bending manner, the side top plate 74 is connected to the lateral both ends of the end top plate 71, and the side plate 75 at least partially covers the outer wall surface of the side portion 42. The end protection bracket 70 is further provided with a guide portion 76 drawn from the lateral inner sides of the side top plate portion 71 and the end top plate portion 74, and the guide portion 76 extends obliquely downward into the receptacle slot 44 for guiding the insertion of the plug connector 100 when the receptacle connector 200 is plugged with the plug connector 100.

The island protection bracket 80 is provided with a bottom plate portion 81 positioned at the bottom of the socket slot 44, an island shielding portion 82 formed by drawing upward from the inner side in the longitudinal direction of the bottom plate portion 81, an end fixing portion 83 extending from the outer side in the longitudinal direction of the bottom plate portion 81 in a bending manner, two clamping arms 84 extending from the bottom plate portion 81 to the side portions 42 in the transverse direction, and two island welding pieces 85 extending from the bottom plate portion 81 in the longitudinal direction and outwards, wherein the island shielding portion 82 is coated on the two sides in the longitudinal direction of the island portion 41 so as to improve the overall strength of the island portion 41. The end fixing portion 83 is held in the end 43 and covered by the end protection bracket 70, specifically the end top plate portion 71 is covered over the end fixing portion 83.

In the lateral direction, two of the holding arms 84 are located on both lateral sides of the island shielding portion 82, and in the longitudinal direction, two of the holding arms 84 are located on both longitudinal sides of the receptacle terminal 50 and on the inner longitudinal sides of the elastic catching portion 73 to be caught by the side shielding portion 32 of the plug protection bracket 30 of the plug connector 100. Meanwhile, two of the island bonding pads 85 extend to both lateral sides of the end bonding pad 721, and the island bonding pads 85 and the end bonding pad 721 are bonded to the same bonding pad of the circuit board. Thus, when the plug connector 100 is mated to the receptacle connector 200, the clamping arms 84 and the elastic latching portions 73 contact the plug protecting bracket 30 simultaneously to shunt and enhance the flow capacity, i.e. to achieve high strength protection and high flow capacity of the receptacle connector 200 in a smaller space.

When the plug connector 100 is mated to the receptacle connector 200, the first inverted U-shaped portion of the first terminal 21 contacts the U-shaped elastic portion 52 of the forward terminal 501, the second inverted U-shaped portion of the second terminal 22 contacts the U-shaped elastic portion 52 of the reverse terminal 502, the first contact groove 215 of the first terminal 21 is buckled with the locking portion 54 of the forward terminal 501, and the second contact groove 225 of the second terminal 22 is buckled with the locking portion 54 of the reverse terminal 502, so that the extraction force required when the board-to-board connector is pulled is increased, the board-to-board connector is not loosened and broken abnormally under the condition that foam is not used for pressing, and the problem of falling under special environments is prevented. Meanwhile, the clamping arms 84 and the elastic latching portions 73 of the socket protecting bracket 60 simultaneously contact the side shielding portions 32 of the plug protecting bracket 30 to shunt and improve the current capacity, i.e. to realize high-strength protection and high current capacity of the board-to-board connector in a smaller space.

In the present utility model, the first terminal 21 is provided with a first contact groove 215 located at the lateral outside of the side wall 11, the second terminal 22 is provided with a second contact groove 225 located at the lateral inside of the side wall 11, and the receptacle terminal 50 is provided with a locking portion 54 protruding into the receptacle slot 44. When the plug connector 100 is mated to the receptacle connector 200, the locking portion 54 of the forward terminal 501 is buckled to the first contact groove 215 of the first terminal 21, the locking portion 54 of the reverse terminal 502 is buckled to the second contact groove 225 of the second terminal 22, and the above-mentioned mating of the plug terminal 20 and the receptacle terminal 50 realizes structural dislocation to ensure a larger pull-out force, and at the same time, has a better feel rate when buckled.

In summary, the above description is only a preferred embodiment of the present utility model, and should not be taken as limiting the scope of the utility model, i.e. all simple and equivalent changes and modifications that are defined by the claims and the specification shall fall within the scope of the utility model.

Claims (10)

1. A board-to-board connector comprises a plug connector and a socket connector which are matched with each other, wherein the plug connector comprises a plug body and plug terminals fixedly arranged on the plug body, the plug body is provided with two side walls extending along the longitudinal direction and two end walls connected with the two side walls, the plug terminals comprise first terminals and second terminals fixedly arranged on the side walls, the first terminals and the second terminals on each side wall are arranged at intervals along the longitudinal direction, the socket connector comprises a socket body and socket terminals fixedly arranged on the socket body, the socket body is provided with a central island part extending along the longitudinal direction, two side parts positioned on two lateral sides of the island part and two end parts connected with the two side parts, the island part, the two side parts and the two end parts jointly define a socket slot, the socket terminals are longitudinally arranged into two rows and comprise forward terminals and reverse terminals with the same structure, the forward terminals and the reverse terminals in each row are longitudinally arranged at intervals, the forward terminals and the reverse terminals in each row are provided with the first terminals and the reverse terminals, the socket terminals are provided with locking grooves, the second terminals are positioned on the first side terminals and the second side terminals are connected with the locking grooves, the first side terminals and the second side terminals are connected with the locking grooves and the first side terminals and the second side terminals are connected with the first side terminals and the second side terminals are connected with the plug connector.

2. The board-to-board connector of claim 1, wherein said receptacle terminal is provided with a fixing portion held on said side portion or said island portion, a U-shaped elastic portion extending from a top of said fixing portion into said receptacle slot, and a solder leg extending in a lateral direction from a bottom of said fixing portion, said locking portion being located on a side of said U-shaped elastic portion adjacent to said fixing portion.

3. The board-to-board connector of claim 2, wherein said island is provided with a vertically extending elongated slot therethrough, said securing portion of said forward terminal being retained on said side portion, said solder feet of said forward terminal extending laterally outwardly from said socket body, said securing portion of said reverse terminal being retained on said island, said solder feet of said reverse terminal extending laterally inwardly into said slot.

4. The board-to-board connector of claim 2, wherein the first terminal is provided with a first inner wall contact portion located on an inner wall surface of the side wall, a first outer wall contact portion located on an outer wall surface of the side wall, and a first connection portion connected to a top end of the first inner wall contact portion and the first outer wall contact portion, the first connection portion being located on a top end of the side wall, and the first contact groove being located on the first outer wall contact portion.

5. The board-to-board connector of claim 4, wherein said second terminal is provided with a second inner wall contact portion located on an inner wall surface of said side wall, a second outer wall contact portion located on an outer wall surface of said side wall, and a second connection portion connected to a tip of said second inner wall contact portion and a tip of said second outer wall contact portion, said second connection portion being located on a tip of said side wall, and said second contact groove being located on said second inner wall contact portion.

6. The board-to-board connector of claim 5, wherein said first terminal is provided with a first solder portion extending laterally outwardly from a bottom of said first inner wall contact portion, and said second terminal is provided with a second solder portion extending laterally inwardly from a bottom of said second inner wall contact portion, said first solder portion and said second solder portion on each of said side walls extending in opposite directions in the lateral direction.

7. The board-to-board connector of claim 6, wherein said side walls and said end walls define a plug slot, said plug body has a longitudinal rib projecting upward from a bottom of said plug slot and a plurality of openings on both lateral sides of said rib, said openings on both sides of said rib are staggered in a longitudinal direction, and said second solder portion extends into said openings.

8. The board-to-board connector of claim 6, wherein said second terminal is provided with an embedded portion extending laterally outwardly from a bottom of said second outer wall contact portion, said embedded portion being embedded in said side wall, and a lateral length of said embedded portion being smaller than a lateral length of said first solder portion.

9. The board-to-board connector of claim 5, wherein said first inner wall contact portion, said first connecting portion and said first outer wall contact portion together form a first inverted U-shaped portion, said second inner wall contact portion, said second connecting portion and said second outer wall contact portion together form a second inverted U-shaped portion, said first inverted U-shaped portion contacting said U-shaped resilient portion of said forward terminal and said second inverted U-shaped portion contacting said U-shaped resilient portion of said reverse terminal when said plug connector is mated to said receptacle connector.

10. The board-to-board connector of claim 1, wherein said first contact grooves and said second contact grooves are respectively provided on both lateral sides of said side wall and staggered in the longitudinal direction, and said locking portions of said forward terminals and said reverse terminals in each row of said receptacle terminals are staggered in the longitudinal direction.