CN212968137U - Board-to-board socket - Google Patents

Abstract

The utility model provides a board to board socket, includes socket ontology, socket terminal and socket reinforcement, socket ontology includes the diapire, certainly the vertical both ends of diapire make progress the bulge socket side wall that forms, be formed with the socket guide portion at the horizontal both ends of socket ontology and certainly the diapire makes progress the bulge and forms island portion, socket guide portion includes plug guide portion and receives the chamber, is located the vertical periphery wall in the horizontal outside in plug guide portion receiving chamber and being located a pair of horizontal periphery wall in the vertical both sides in plug guide portion receiving chamber, socket reinforcement including cover in the main part on vertical periphery wall surface, certainly the vertical both sides of main part extend along horizontal direction cover in the outer horizontal periphery wall of horizontal periphery wall cover portion, certainly horizontal periphery wall covers the top and inwards turns over the elasticity arm and the guard portion that extend the formation. The application can effectively protect the contact arm part from being damaged.

Description

Board-to-board socket

Technical Field

The present application relates to the field of electrical connectors, and more particularly, to a board-to-board socket.

Background

Board-to-board connector assemblies are widely used in the consumer electronics field, such as smart phones, tablet computers, wearable devices, and the like. Present smart mobile phone and wearable equipment all require extremely high to the space, the size of spare part is reducing equally, a ray of board has reached 0.6 mm's minimum height to the board after board-to-board plug and the socket cooperation of board-to-board producer, the terminal interval has also reached 0.25 mm's distance, so small connector, higher requirement has been proposed to connector structural strength, and compare in traditional board to board connector component, the large-scale function integration of current smart mobile phone, propose higher requirement to electric current bearing capacity, require to reach 5A's bearing capacity to electric current transmission like the LCD screen, traditional board can't adapt to present market to intensity and electric current transmission's requirement to board connector component design.

Disclosure of Invention

In view of the above, it is desirable to provide a board-to-board socket, which has a simple structure and good mass productivity, and ensures that the socket reinforcement can be well protected and the elastic arm portion is prevented from being damaged.

In order to solve the technical problem, the application provides a board-to-board socket, including socket ontology, socket terminal and socket reinforcement, socket ontology includes the diapire, certainly the vertical both ends of diapire make progress the bulge form socket sidewall, form in the socket guide portion at the horizontal both ends of socket ontology reaches certainly the upwards bulge of diapire forms island portion, socket guide portion includes plug guide portion receiving chamber, is located the vertical periphery wall in the horizontal outside of plug guide portion receiving chamber and is located a pair of horizontal periphery wall in the vertical both sides of plug guide portion receiving chamber, socket reinforcement including cover in the main part on vertical periphery wall surface, from the vertical both sides periphery wall of main part bend and extend along horizontal direction cover in the outer horizontal periphery wall of horizontal periphery wall and from horizontal cover portion top is towards plug guide portion receiving chamber one side respectively turns over the elasticity arm and the guard shield that extends the formation, the elastic arm portion comprises an inclined connecting arm formed by bending the transverse peripheral wall covering portion and extending downwards in an inclined mode, a contact arm portion formed by vertically bending the inclined connecting arm and a contact convex portion formed by stamping the plug guide portion receiving cavity from the contact arm portion, and one end of the contact arm portion extends to one side of the protection portion along the transverse direction.

Preferably, the upper end of the contact arm portion is of a cambered surface structure, and the inclined angle of the inclined connecting arm is consistent with that of the protection portion.

Preferably, a gap exists between the guard portion and the contact arm portion as viewed from above, the guard portion being located longitudinally outside the contact arm portion.

Preferably, socket ontology's horizontal periphery wall is including supporting the shoulder and being located support the vertical inboard intercommunication of shoulder the elasticity of plug guide portion receiving chamber dodges the portion, the elasticity arm is certainly the top of horizontal periphery wall cover turns over to span and gets into behind the supporting shoulder in the elasticity dodges the portion, the contact convex part is located plug guide portion receiving chamber.

Preferably, the protection portion is folded from the top end of the covering portion of the transverse peripheral wall and spans over the support shoulder portion to enter the upper portion of the elastic avoiding portion, and the contact arm portion is located below the protection portion in the inclined extending direction.

Preferably, a mounting step portion is formed on the longitudinal outer side of the support shoulder, the transverse peripheral wall covering portion extends on the mounting step portion, and the support shoulder is gradually thinned from bottom to top and comprises a thicker portion located at the lower part and a thinner portion located at the top.

Preferably, the thinner portion is provided with an inclined surface with a larger angle toward one side of the plug guide receiving cavity, the free end of the protection portion is supported on the larger inclined surface, a smaller inclined surface is provided at one end of the thinner portion located on the longitudinal outer side, and the smaller inclined surface is used for avoiding the bending radian of the inclined connecting arm and the protection portion.

Preferably, when a plug is inserted into the socket, the plug includes a plug reinforcement inserted into the plug guide receiving cavity, the plug reinforcement contacts and presses the protection portion and the inclined connecting arm along both longitudinal ends, the protection portion is supported by the supporting shoulder, and when the lower end of the inclined connecting arm is pressed by the plug reinforcement, the contact arm portion is forced to deform toward the protection portion to reduce a gap between the contact arm portion and the inclined connecting arm portion in a vertical projection direction, so that the plug reinforcement is smoothly inserted into and electrically contacted with the contact protrusion.

Preferably, the horizontal both ends of island portion are equipped with horizontal position and are less than the island portion by the protection portion, the socket reinforcement still includes certainly the horizontal inboard downward bending of main part and extend to by protection portion and cover by the central guide portion of protection portion, central guide portion include certainly the horizontal inboard downward bending of main part forms first central guide arm, certainly first central guide arm bottom bend and extend to by the support base arm of protection portion one side, certainly support base arm slant upwards extend to by the second central guide arm of protection portion top and certainly the second central guide arm free end bends downwards and blocks into the card tip of being in the protection portion.

Preferably, stepped portions are provided at both longitudinal ends of the longitudinal peripheral wall on a side close to the plug guide receiving cavity, a longitudinal width of an upper end of the first central guide arm is greater than a longitudinal width of a lower end of the first central guide arm, and bottoms of both longitudinal ends of the upper end of the first central guide arm are correspondingly located above the stepped portions.

This application board is through inciting somebody to action the contact arm portion of elasticity arm extends to along the transverse direction protection portion one side, when the plug reinforcement inserts, through the slope linking arm receives the extrusion drive the contact arm portion is close to along longitudinal direction protection portion one side is in order to avoid the contact arm portion to be damaged by the plug.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application.

Fig. 1-11 are drawings of a board-to-board connector assembly of the present application;

FIG. 1 is an assembled view of a board-to-board connector assembly according to an embodiment;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is a perspective assembly view of a pair of panel plugs according to one embodiment;

FIG. 4 is a perspective view of a plug body of a pair of plate plugs of an embodiment and a partial enlarged view thereof;

FIG. 5 is a perspective view of a header reinforcement member of a one-plate-to-one header of an embodiment;

FIG. 6 is a perspective view of an alternate angle of the header reinforcement of the one-plate-to-one header of the embodiment;

FIG. 7 is a perspective assembly view of a one-board-to-one-board socket according to an embodiment;

fig. 8 is a perspective view of a socket body of the one-board-to-board socket of the embodiment and a partially enlarged view thereof;

FIG. 9 is a perspective view of a socket stiffener for a board-to-board socket according to an embodiment;

FIG. 10 is a top view of a socket stiffener for a board-to-board socket of an embodiment;

fig. 11 is a sectional view taken along the line B-B shown in fig. 1.

Fig. 12 is a perspective view of a socket reinforcing member of the board-to-board socket of the second embodiment;

fig. 13 is a plan view of the socket reinforcing member of the board-to-board socket according to the second embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings.

The direction of the present application defines the right direction (or lateral direction) with the X direction shown in fig. 1 as the left-right direction, the front direction (or longitudinal direction) with the Y direction as the front-back direction, and the upper direction (i.e., vertical direction) with the Z direction as the up-down direction.

Example one

Referring to fig. 1, the board-to-board connector assembly of the present application includes a plug a attached to a printed circuit board and a socket B attached to another printed circuit board, wherein the plug a and the socket B are in buckled connection with each other.

The plug a comprises a plug body 10, a plurality of plug terminals 20 formed in the plug body 10, and plug reinforcing members 30 fixed to both ends of the plug body 10 in the transverse direction. The socket B includes a socket body 40, socket terminals 50 mounted on the socket body 40, and socket reinforcing members 60 mounted and fixed to both lateral ends of the socket body 40.

Referring to fig. 2 to 6, the plug body 10 of the plug a includes a top wall 11, a pair of plug side walls 12 formed by extending downward from two longitudinal sides of the top wall 11, plug guide portions 14 formed at two lateral ends of the plug body 10, and an island receiving cavity 13 formed between the top wall 11, the pair of plug side walls 12 and the plug guide portions 14.

The plug terminals 20 are integrally formed on a pair of plug side walls 12 in two rows in the lateral direction, and the plug guide portion 14 includes a bottom surface 141, a longitudinal outer side 142, a pair of lateral outer sides 143, and a slope 144 facing the island receiving cavity 13. The longitudinal outer side 142 is provided with a first notch 1421, and the transverse outer side 143 includes two longitudinally protruding protrusions 1431, 1432, a second notch 1433 located between the two protrusions 1431, 1432, and a third notch 1434 located between the protrusion 1432 and the plug side wall 12. The inclined surface 144 is formed with an inclined surface 1441 upwardly extending from the bottom surface 141 to the top wall 11 and a catching hole 1442 concavely formed from the inclined surface 1441 upwardly at a side close to the bottom surface 141.

The plug reinforcement member 30 includes a covering base 31 covering the bottom surface 141 of the plug guide portion 14 along the longitudinal direction, a longitudinal outer side surface covering portion 35 and a longitudinal inner side surface covering portion 34 respectively covering the longitudinal outer side surface 142 and being clamped into the clamping hole 1442, and a transverse outer side surface covering portion 33 covering the transverse outer side surface 143 along the transverse direction, which is formed by upward bending and extending the longitudinal two ends of the covering base 31. The longitudinal outer surface covering 35 is snapped into the first recess 1421.

The transverse outer side surface covering portion 33 includes a contact portion 331 clamped in the second notch 1421, and a solder leg 332 formed by vertically bending towards the longitudinal outer side from the top of one end of the transverse outer side surface covering portion 33 away from the longitudinal outer side surface covering portion 35, the contact portion 331 of the transverse outer side surface covering portion 33 is clamped in the second notch 1433, the solder leg 332 is formed by vertically bending towards the longitudinal outer side after being clamped in the third notch 1434, the transverse outer side surface covering portion 33 is further provided with a bayonet 333 to be clamped in the periphery of the projection 1432, so that the holding force between the plug reinforcing member 30 and the plug guiding portion 14 is enhanced.

Referring to fig. 2, the plug terminal 20 includes a plug terminal solder leg 24 extending from the upper surface of the top wall 11 in the longitudinal direction to the outside of the top wall 11, a plug terminal first contact portion 22 bent from the plug terminal solder leg 24 along the surface of the top wall 11 to the inner side surface of the plug side wall 12, and a plug terminal second contact portion 23 bent from the lower end of the plug terminal first contact portion 22 in the opposite direction and extending to the outer side surface of the plug side wall 12. The second contact portion 23 of the plug terminal is provided with a groove structure.

As shown in fig. 1, 2, 7 and 8, the socket body 40 of the socket B of the board-to-board connector assembly of the present application includes a bottom wall 41, a pair of socket sidewalls 42 extending upward from two longitudinal sides of the bottom wall 41, an island 45 protruding upward from the bottom wall 41 between the pair of socket sidewalls 42, socket guides 44 formed at two lateral ends of the socket body 40, and a plug sidewall receiving cavity 43 formed between the island 45 and the pair of socket sidewalls 42.

The bottom wall of the socket body 40 is provided with a plurality of terminal grooves 46 from bottom to top, the socket terminal 50 is assembled in the terminal grooves 46 upwards, the socket terminal 50 includes a support arm 51 extending in the terminal groove 46 at the bottom wall 41 and exposed at the bottom of the terminal groove 46, a socket terminal second contact portion 52 bent upwards from the longitudinal outer side of the support arm 51 and located on the longitudinal side of the island portion 45 and facing the socket side wall 42, a socket terminal first contact portion 53 bent upwards from the longitudinal inner side of the support arm 51 and located on the longitudinal side of the socket side wall 42, a holding portion 54 bent upwards from the top end of the first contact portion 53, and a solder foot 55 bent vertically from the bottom end of the holding portion 54 and extending towards the longitudinal outer side and located on the lower surface of the bottom wall 41 of the socket body 40.

When the plug a is matched with the socket B, the island portion 45 is accommodated in the island portion receiving cavity 13 of the plug a, the plug side wall 12 of the plug a is accommodated in the plug side wall receiving cavity 43 of the socket B, and the plug guide portion 14 is guided into the socket guide portion 44. The plug terminal 20 is clamped between the first and second contact portions 53 and 52 of the socket terminal 50, and the first and second contact portions 22 and 23 of the plug terminal 20 are electrically contacted with the first and second contact portions 53 and 52 of the socket terminal 50, respectively.

As shown in fig. 8, protected portions 451 are provided at both lateral ends of the island portion 45 toward the socket guide portion 44, and each protected portion 451 includes a mesa portion 453 having a lower horizontal surface than the island portion 45, an escape slope 452 inclined obliquely downward from the mesa portion 453, a catching groove 454 recessed downward from the mesa portion 453, and a communication notch 455 opened laterally outward from the catching groove 454 to communicate with the escape slope 452.

The receptacle guide 44 includes peripheral walls 441, 442 and a plug guide receiving cavity 443 located between the peripheral walls 441, 442. The peripheral wall 441 includes a longitudinal peripheral wall 441 and a pair of lateral peripheral walls 442 connected to both ends of the longitudinal peripheral wall 441, the lateral peripheral walls 442 being adjacent to the receptacle side walls 42.

The plug guide receiving cavity 443 is formed with a through hole 4431 penetrating in the up-down direction corresponding to the lateral extension of the island 45, the through hole 4431 extending up to the lower end of the longitudinal outer peripheral wall 441. The longitudinal outer peripheral wall 441 is provided at the lateral outer side and the lateral inner side thereof with first and second extension grooves 4411, 4412, respectively, and the second extension groove 4412 communicates with the through-hole 4431. The longitudinal peripheral wall 442 protrudes upward from the middle thereof to form a support shoulder 4421, and the outer periphery of the support shoulder 4421 is provided with a mounting step 4425 located on the longitudinal outer side of the support shoulder 4421 and extending in the transverse direction and an elastic escape 4424 located on the longitudinal inner side of the support shoulder 4421. The support shoulder 4421 is tapered from bottom to top to form a thicker portion 4422 and a thinner portion 4423, the thinner portion 4423 is tapered from bottom to top, the thinner portion 4423 forms a larger inclined surface at one side of the plug guide receiving cavity 443, and the thinner portion 4423 forms a smaller inclined surface at one end of the longitudinally outer side. Stepped portions 4413 are provided at both longitudinal ends of the longitudinal outer peripheral wall 441 inside the plug guide receiving cavity 443, respectively. The mounting stepped part 4425 partially penetratingly forms a third extending groove 4428 in a vertical direction.

With continued reference to fig. 9 to 11, the socket reinforcing member 60 includes a main body portion 61 covering the top surface of the longitudinal peripheral wall 441 in the longitudinal direction, a longitudinal peripheral wall covering portion 62 bent downward from the lateral outer end of the main body portion 61 and extending into the first extending groove 4411, a central guide portion 63 bent downward from the lateral inner side of the main body portion 61 and extending to the protected portion 451 at the lateral end of the island portion 45, a lateral peripheral wall covering portion 64 located outside the lateral peripheral wall 442 in the longitudinal direction and bent downward from both longitudinal ends of the body portion 61 and extending along the mounting step portion 4425, a protector portion 66 bent from a tip end of the lateral peripheral wall covering portion 64 toward the plug guide receiving cavity 443 and located on the support shoulder portion 4421, and a resilient arm portion 65 bent from a top of the lateral peripheral wall covering portion 64 toward the plug guide receiving cavity 443 and extending to the resilient escape portion 4424.

An edge of the protector 66 at a side of the plug guide receiving cavity 443 is formed to extend obliquely downward to guide the insertion of the plug reinforcement 30. The resilient arm portion 65 includes a slanted connecting arm 651 formed by being bent from the top of the lateral peripheral wall covering portion 64 toward the plug guide receiving cavity 443 along the support shoulder 4421, a contact arm portion 652 formed by extending vertically downward from the free end of the slanted connecting arm 651, and a contact protrusion 653 stamped from the contact arm portion 652 toward the plug guide receiving cavity 443. The contact arm portion 652 extends in the lateral direction to the side of the guard portion 66 to form a bar-like structure extending in the lateral direction. The contact projection 653 is located in the plug guide 443, and the protector 66 and the contact arm 652 do not overlap with each other with a gap therebetween, as viewed from above. The inclined connecting arm 651 maintains the same inclination angle, and the protecting portion 66 and the elastic arm portion 65 are formed to be bent and extended independently from the lateral peripheral wall covering portion 64.

The free ends of the longitudinal peripheral wall covering portions 62 are fixed as solder tails to the printed circuit board, and the bottom ends of the lateral peripheral wall covering portions 64 are fixed as solder tails by extending through the third extension grooves 4428 to the printed circuit board.

The central guide portion 63 includes a first central guide arm 631 bent downward from the inside of the main body portion 61, the first central guide arm extending into the second extending groove 4412, a support base arm 632 bent downward from the bottom of the first central guide arm 631 and extending along the through hole 4431 to the bottom of the protected portion 451 on both sides of the island portion 45, a second central guide arm 634 extending upward from the support base arm 632 obliquely above the protected portion 451, and a locking end 635 bent downward from the free end of the second central guide arm 634 and locked into the locking groove 454. The first and second center guide arms 631, 634 are used to guide the insertion of the header reinforcement 30 and protect the longitudinal outer peripheral wall 441 of the socket body 40 and the protected portions 451 at both lateral ends of the island portion 45. The longitudinal outer side surface covering portion 35 and the longitudinal inner side surface covering portion 34 of the plug reinforcement 30 are guided by the first and second central guide arms 631, 634, respectively, and enter between the first and second central guide arms 631, 634 above the support base arm 632, but in the inserted state, the longitudinal outer side surface covering portion 35 and the longitudinal inner side surface covering portion 34 are not in electrical contact with the first and second central guide arms 631, 634. During the insertion process, the support base arm 632 is pressed and the mounted pcb generates a supporting force to make the first and second central guide arms 631 and 634 have a certain elasticity.

The upper end of the first center guide arm 631 has a longitudinal width greater than that of the lower end and stepped portions 4413 are formed at both sides of the upper end of the first center guide arm 631 in the longitudinal direction to abut against the inner side of the longitudinal outer peripheral wall 441. The wider upper end bend of the first central guide arm 631 increases the guidance of the header reinforcement 30 and prevents insertion damage.

In a natural state, the contact arm portion 652 of the elastic arm portion 65 is located on the elastic escape portion 4424 and has a deformation gap with the inner side surface of the support shoulder portion 4421, and the contact protrusion 653 of the elastic arm portion 65 is deformed in the deformation gap when the elastic arm portion 65 is longitudinally pressed.

When the plug a is inserted, the lateral outer surface covering portion 33 of the plug reinforcement 30 first contacts the protecting portion 66, the inclined connecting arm 651 of the elastic arm portion 65, and the upper end of the first central guide arm 631, and when the plug reinforcement 30 is further pressed down, the contact protrusion 653 is pressed along the longitudinal outer side, so that the contact arm portion 652 is elastically deformed toward the inner wall surface of the support shoulder 4421 in the elastic escape portion 4424. In this process, when the plug reinforcement member 30 contacts and longitudinally presses the protection portion 66 and the inclined connecting arm 651, a portion of the protection portion 66 extending to the plug guide receiving cavity 443 side is short and supported by the supporting shoulder 4421, and the elastic deformation is small, and when the lower end of the inclined connecting arm 651 is longitudinally pressed, the contact arm portion 652 is gradually forced to deform toward the supporting shoulder 4421, so that the outer side of the contact arm portion 652 is gradually close to the protection portion 66 and the gap therebetween is reduced, and the contact arm portion 652 is prevented from being damaged when the plug reinforcement member 30 is inserted into the contact arm portion 652. Meanwhile, the upper end of the contact arm portion 652 is formed in an arc-shaped configuration to better guide the inserted plug reinforcing member 30 without crushing the contact arm portion 652. The guard portion 66 is located laterally outward of the resilient arm portion 65.

The plate-to-plate socket of the present application extends the contact arm portion 652 of the elastic arm portion 65 to the side of the protection portion 66 in the transverse direction, and when the plug reinforcement 30 is inserted, the contact arm portion 652 is driven to be close to the side of the protection portion 66 in the longitudinal direction by the pressing of the inclined connecting arm 651 so as to prevent the contact arm portion 652 from being damaged by the plug.

Example two

Please refer to fig. 12 and 13, which are diagrams illustrating a socket stiffener 60 according to a second embodiment.

Compared with the first embodiment, the second embodiment is different mainly in the structure of the socket reinforcing member 60, that is, the protecting portion 66 is integrally connected with the inclined connecting arm 651 of the elastic arm portion 65 and is formed by being bent from the top of the transverse peripheral wall covering portion 64, and is herein collectively referred to as the protecting portion 66, and the protecting portion 66 is divided into first and second protecting portions 661, 662 in the transverse direction. The elastic arm portion 65 is formed to extend obliquely downward from the first guard portion 661, and the elastic arm portion 65 includes an inclined connecting arm 651 formed to extend obliquely downward from a lower end of the first guard portion 661 to the plug guide receiving cavity 443, a contact arm portion 652 formed to be bent vertically downward from a lower end of the inclined connecting arm 651, and a contact protrusion 653 formed to be punched from the contact arm portion 652 toward the plug guide receiving cavity 443. The contact arm portion 652 extends to the side of the second guard portion 662 in the lateral direction and is split from the second guard portion 662 to form a split groove 654.

The technical effects achieved by the second embodiment are consistent with the first embodiment, and the preferred embodiment is the first embodiment.

In the present specification, the printed circuit board on which the plug a or the socket B is mounted is not limited to a circuit board, and may be any printed circuit board as long as it is compatible with an object provided with a current transmission line.

The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims (9)

1. A board-to-board socket comprises a socket body, a socket terminal and a socket reinforcing piece, wherein the socket body comprises a bottom wall, a socket side wall formed by upwards protruding two longitudinal ends of the bottom wall, a socket guide part formed at the two transverse ends of the socket body and an island part formed by upwards protruding the bottom wall, the socket guide part comprises a plug guide part receiving cavity, a longitudinal peripheral wall located at the transverse outer side of the plug guide part receiving cavity and a pair of transverse peripheral walls located at the two longitudinal sides of the plug guide part receiving cavity, the socket reinforcing piece comprises a main body part covering the surface of the longitudinal peripheral wall, an elastic arm part and a protective part, the main body part is bent from the two longitudinal sides of the main body part and extends to cover the transverse peripheral wall outside the transverse peripheral wall along the transverse direction, the elastic arm part and the protective part are respectively formed by folding and extending towards one side, the plug guide part protection device is characterized in that the elastic arm part comprises an inclined connecting arm, a contact arm and a contact convex part, wherein the inclined connecting arm is formed by bending the transverse peripheral wall covering part and extending downwards in an inclined mode, the contact arm is formed by vertically bending the inclined connecting arm, the contact arm faces towards the plug guide part receiving cavity and is formed by stamping, and one end of the contact arm extends to one side of the protection part along the transverse direction.

2. The board-to-board socket of claim 1, wherein the upper end of said contact arm portion is of a cambered configuration, and said angled connecting arm is at an angle consistent with the angle of inclination of said guard portion.

3. The board-to-board socket of claim 1, wherein a gap exists between said guard portion and said contact arm portion when viewed from above, said guard portion being located longitudinally outboard of said contact arm portion.

4. The board-to-board jack of claim 1, wherein said lateral peripheral wall of said jack body includes a support shoulder and a resilient relief portion located longitudinally inward of said support shoulder and communicating with said plug guide receiving cavity, said resilient arm portion being folded over from a top end of said lateral peripheral wall covering portion over said support shoulder and into said resilient relief portion, said contact protrusion being located in said plug guide receiving cavity.

5. The board-to-board socket of claim 4 wherein said guard portion is folded over said support shoulder from a top end of said transverse peripheral wall covering portion over said resilient relief portion, said contact arm portion being located below a direction of angular extension of said guard portion.

6. The board-to-board socket of claim 5, wherein said support shoulder is formed with a mounting step portion on the longitudinal outer side thereof, said lateral peripheral wall covering portion extending over said mounting step portion, said support shoulder being tapered from the bottom to the top thereof, and including a thicker portion at the lower portion and a thinner portion at the top thereof.

7. The board-to-board socket according to claim 6, wherein the thinner portion is provided with an inclined surface having a larger angle toward the plug guide receiving cavity, the free end of the protecting portion is supported on the inclined surface having a larger angle, and the end of the thinner portion located on the outer side in the longitudinal direction is provided with a smaller inclined surface for avoiding the bending curvature of the inclined connecting arm and the protecting portion.

8. The board-to-board socket according to claim 1, wherein both lateral ends of the island portion are provided with a protected portion having a lower level than the island portion, the socket reinforcement further comprises a central guide portion bent downward from a lateral inner side of the main body portion and extending to the protected portion and covering the protected portion, the central guide portion comprises a first central guide arm bent downward from the lateral inner side of the main body portion, a support base arm bent from a bottom of the first central guide arm and extending to a side of the protected portion, a second central guide arm extending obliquely upward from the support base arm and extending above the protected portion, and a click-in end portion bent downward from a free end of the second central guide arm and clicking into the protected portion.

9. The board-to-board socket according to claim 8, wherein the longitudinal peripheral wall is provided with a step portion at both longitudinal ends thereof on a side thereof adjacent to said plug guide receiving cavity, the longitudinal width of the upper end of said first central guide arm is greater than the longitudinal width of the lower end of said first central guide arm, and the bottom of the longitudinal ends of the upper end of said first central guide arm is located above said step portion.

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