Board-to-board socket

Abstract

A board-to-board socket includes a socket body, socket terminals, and a socket reinforcement. The socket body includes a bottom wall and socket side walls protruding upward from both longitudinal ends of the bottom wall. The socket guiding portion includes a plug guiding portion receiving cavity, a longitudinal outer peripheral wall, and a pair of transverse outer peripheral walls. The socket reinforcement includes a main body portion covering the surface of the longitudinal outer peripheral wall, a transverse outer peripheral wall covering portion extending from the main body portion to cover the outside of the transverse outer peripheral wall, and an elastic arm portion extending from the transverse outer peripheral wall covering portion to the side of the transverse outer peripheral wall close to the plug guiding portion receiving cavity. A snap notch is formed inside the longitudinal outer peripheral wall, and a snap piece that snaps into the snap notch is formed by bending the transverse inner side of the main body portion downward. A longitudinal outer peripheral wall covering portion covering the outer side surface of the longitudinal outer peripheral wall is formed by bending the transverse outer side of the main body portion downward. This application can effectively protect the plug body from being damaged.

Description

Technical Field

[0001] This application relates to the field of electrical connectors, and particularly to a board-to-board socket. Background Art

[0002] Board-to-board connector assemblies are widely used in the field of consumer electronics, such as smart phones, tablet computers, wearable devices, etc. Currently, both smart phones and wearable devices have extremely high requirements for space, and the sizes of components are also shrinking. The minimum height after the cooperation of the board-to-board plug and socket of leading board-to-board manufacturers has reached an ultra-low height of 0.6 mm, and the terminal pitch has also reached a distance of 0.25 mm. For such a tiny connector, higher requirements are put forward for the structural strength of the connector. Moreover, compared with traditional board-to-board connector assemblies, the large-scale functional integration of existing smart phones puts forward higher requirements for the current-carrying capacity. For example, the current transmission requirements for liquid crystal displays and the like reach a carrying capacity of 5 A. The design of traditional board-to-board connector assemblies can no longer meet the current market requirements for strength and current transmission. Summary of the Invention

[0003] In view of this, it is necessary to provide a board-to-board socket that can meet the requirements of good strength and large current transmission after the product is thinned, and the socket reinforcement does not scratch the plastic of the plug body.

[0004] To solve the above technical problems, this application provides a board-to-board socket, including a socket body, socket terminals, and a socket reinforcement. The socket body includes a bottom wall, socket side walls protruding upward from both longitudinal ends of the bottom wall, socket guiding portions formed at both transverse ends of the socket body, and an island portion protruding upward from the bottom wall. The socket guiding portion includes a plug guiding portion receiving cavity, a longitudinal outer peripheral wall located laterally outside the plug guiding portion receiving cavity, and a pair of transverse outer peripheral walls located on both longitudinal sides of the plug guiding portion receiving cavity. The socket reinforcement includes a main body portion covering the surface of the longitudinal outer peripheral wall, a transverse outer peripheral wall covering portion extending laterally from both longitudinal sides of the main body portion and covering the outside of the transverse outer peripheral wall, and an elastic arm portion extending from the transverse outer peripheral wall covering portion to the side of the transverse outer peripheral wall close to the plug guiding portion receiving cavity. The top of the elastic arm portion is bent and extended laterally outward to form a hanging portion hanging on the top surface of the transverse outer peripheral wall. A snap notch is formed inside the longitudinal outer peripheral wall, and a snap piece is formed by bending the transverse inner side of the main body portion downward and snapping into the snap notch. A longitudinal outer peripheral wall covering portion covering the outer side surface of the longitudinal outer peripheral wall is formed by bending the transverse outer side of the main body portion downward.

[0005] Preferably, the width of the bottom surface of the snap notch is greater than or equal to the thickness of the free end of the snap piece so that the free end of the snap piece is located above the bottom surface of the snap notch and does not protrude into the plug guiding portion receiving cavity.

[0006] Preferably, when observing the socket reinforcing member in the transverse direction, at least a part of the snap piece is covered by the elastic arm portion.

[0007] Preferably, a contact piece is formed at a position corresponding to the hanging portion on the longitudinal outer peripheral wall covering portion. When the plug and the socket are mated, the plug reinforcing member presses the elastic arm portion along the longitudinal outer side and forces the hanging portion to move outward in the longitudinal direction to be in electrical contact with the contact piece, and at the same time, the plug reinforcing member is in electrical contact with the elastic arm portion.

[0008] Preferably, the bottom of the longitudinal outer peripheral wall covering portion is fixed to the printed circuit board as a welding foot, and the transmission of current is conducted from the plug reinforcing member through the hanging portion to the welding foot at the bottom of the longitudinal outer peripheral wall covering portion.

[0009] Preferably, the transverse outer peripheral wall of the socket body includes a support shoulder portion and an elastic avoidance portion located longitudinally inside the support shoulder portion and communicating with the plug guiding portion receiving cavity, and the elastic arm portion can elastically deform in the longitudinal direction in the elastic avoidance portion.

[0010] Preferably, an installation step portion is formed on the longitudinal outer side of the support shoulder portion, and the transverse outer peripheral wall covering portion extends on the installation step portion.

[0011] Preferably, a communication step portion communicating with the elastic avoidance portion is formed at least at one end of the support shoulder portion in the transverse direction. The elastic arm portion includes a tension portion bent from one transverse end of the transverse outer peripheral wall covering portion and extending on the communication step portion, and an elastic main body arm at least partially extending on the elastic avoidance portion in the transverse direction from the tension portion. The hanging portion is bent outward in the longitudinal direction from the top end of the elastic main body arm and is hung above the support shoulder portion.

[0012] Preferably, a contact convex portion protrudes from the elastic main body arm toward the plug guiding portion receiving cavity. When observing from top to bottom, at least a part of the contact convex portion is located in the plug guiding portion receiving cavity, and the contact convex portion is in electrical contact with the plug reinforcing member. The transmission of current includes the following two paths: one path is along the contact convex portion, the hanging portion, the contact piece, and the welding foot at the bottom of the longitudinal outer peripheral wall covering portion, and the other path is along the contact convex portion, the elastic main body arm, the tension portion, and the welding foot at the bottom of the longitudinal outer peripheral wall covering portion. The parallel transmission of the two current transmission paths can effectively reduce the temperature rise.

[0013] Preferably, the top end of the lateral outer peripheral wall covering portion is bent toward the plug guiding portion receiving cavity to form a protection portion supported on the supporting shoulder portion. A high platform is formed at the top of the supporting shoulder portion near the communicating step portion. A low groove adjacent to the high platform is further formed on the top of the supporting shoulder portion. The protection portion is supported on the high platform, the hanging portion is supported in the low groove, the horizontal position of the surface of the low groove is lower than the horizontal position of the surface of the high platform, and the upper surface of the hanging portion is lower than the upper surface of the protection portion.

[0014] In the present application, a clamping notch is formed on the inner side of the longitudinal outer peripheral wall of the socket body, and then a clamping piece that is bent downward on the inner side of the main body portion 61 and clamped on the clamping notch is formed. The free end of the clamping piece is located above the bottom surface of the clamping notch and will not protrude into the plug guiding portion receiving cavity, so as to avoid rubbing against the longitudinal outer side surface of the plug body to generate plastic debris and affect the use of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation to the present application.

[0016] Figures 1 to 15 These are the schematic drawings of the first embodiment of the board-to-board connector assembly of the present application:

[0017] Figure 1 It is the combined drawing of the board-to-board connector assembly of the first embodiment;

[0018] Figure 2 It is a cross-sectional view along the Figure 1 dotted line A-A shown;

[0019] Figure 3 It is the three-dimensional combined drawing of the board-to-board plug of the first embodiment;

[0020] Figure 4 It is the three-dimensional view and partial enlarged view of the plug body of the board-to-board plug of the first embodiment;

[0021] Figure 5 It is the three-dimensional view of the plug reinforcing member of the board-to-board plug of the first embodiment;

[0022] Figure 6 It is the three-dimensional view of the plug reinforcing member of the board-to-board plug of the first embodiment from another angle;

[0023] Figure 7 It is the three-dimensional combined drawing of the board-to-board socket of the first embodiment;

[0024] Figure 8 It is the three-dimensional view and partial enlarged view of the socket body of the board-to-board socket of the first embodiment;

[0025] Figure 9 Isometric view of the socket reinforcement of the board-to-board socket in Embodiment 1;

[0026] Figure 10 Isometric view of the socket reinforcement of the board-to-board socket in Embodiment 1 from another angle;

[0027] Figure 11 Top view of the socket reinforcement of the board-to-board socket in Embodiment 1;

[0028] Figure 12 Left or right view of the socket reinforcement of the board-to-board socket in Embodiment 1;

[0029] Figure 13 Side view of the socket reinforcement of the board-to-board socket in Embodiment 1;

[0030] Figure 14 For the cut along Figure 1 Cross-sectional view along the dashed line B-B shown;

[0031] Figure 15 For the cut along Figure 1 Partial cross-sectional view along the dashed line C-C shown.

[0032] Figures 16 to 18 Explanatory drawing of Embodiment 2 of the board-to-board connector assembly of the present application:

[0033] Figure 16 Partial isometric view of the board-to-board socket in Embodiment 2;

[0034] Figure 17 Isometric view of the socket reinforcement of the board-to-board socket in Embodiment 2;

[0035] Figure 18 Side view of the socket reinforcement of the board-to-board socket in Embodiment 2.

[0036] Figures 19 to 21 Explanatory drawing of Embodiment 3 of the board-to-board connector assembly of the present application:

[0037] Figure 19 Partial isometric combined view of the board-to-board socket in Embodiment 3;

[0038] Figure 20 Partial enlarged view of the socket body of the board-to-board socket in Embodiment 3;

[0039] Figure 21 Isometric view of the socket reinforcement of the board-to-board socket in Embodiment 3. Detailed implementation manners

[0040] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments of this application and the corresponding drawings.

[0041] The direction definition of this application is based on Figure 1 the right side (or transverse direction) of the X direction shown as the left - right direction, the front side (or longitudinal direction) of the Y direction as the front - back direction, and the upper side (or vertical direction) of the Z direction as the up - down direction.

[0042] Embodiment 1

[0043] Please refer to Figure 1 as shown, the board - to - board connector assembly of this application includes a plug A mounted on a printed circuit board and a socket B mounted on another printed circuit board, and the plug A and the socket B are snap - connected to each other.

[0044] The plug A includes a plug body 10, a plurality of plug terminals 20 formed within the plug body 10, and plug reinforcement members 30 fixed to the transverse two ends of the plug body 10. The socket B includes a socket body 40, socket terminals 50 mounted on the socket body 40, and socket reinforcement members 60 mounted and fixed to the transverse two ends of the socket body 40.

[0045] Please refer to Figures 2 to 6 as shown, the plug body 10 of the plug A includes a top wall 11, a pair of plug side walls 12 extending downward from the longitudinal two sides of the top wall 11, plug guiding portions 14 formed at the transverse two ends of the plug body 10, and an island receiving cavity 13 formed among the top wall 11, the pair of plug side walls 12, and the plug guiding portions 14.

[0046] The plug terminals 20 are integrally formed in two rows in the transverse direction on a pair of plug side walls 12. The plug guiding portion 14 includes a bottom surface 141, a longitudinal outer side surface 142, a pair of transverse outer side surfaces 143, and an inclined surface 144 facing the island receiving cavity 13. A first notch 1421 is provided on the longitudinal outer side surface 142. The transverse outer side surface 143 includes two longitudinally protruding bumps 1431, 1432, a second notch 1433 located between the two bumps 1431, 1432, and a third notch 1434 located between the bump 1432 and the plug side wall 12. The inclined surface 144 is formed with an inclined surface 1441 extending from the bottom surface 141 upward to the top wall 11 and a card hole 1442 formed by being recessed upward on one side of the inclined surface 1441 near the bottom surface 141.

[0047] The plug reinforcement 30 includes a covering base 31 covering the bottom surface 141 of the plug guiding portion 14 in the longitudinal direction, a longitudinal outer side covering portion 35 and a longitudinal inner side covering portion 34 respectively formed by bending upwards from the transverse two ends of the covering base 31 and covering the longitudinal outer side surface 142 and the longitudinal outer side surface inserted into the card hole 1442, and a transverse outer side covering portion 33 formed by bending upwards from the longitudinal two ends of the covering base 31 and covering the outside of the transverse outer side surface 143 in the transverse direction. The longitudinal outer side covering portion 35 is inserted into the first notch 1421.

[0048] The transverse outer side covering portion 33 includes a contact portion 331 inserted into the second notch 1433, and a welding leg 332 formed by vertically bending the top of the transverse outer side covering portion 33 away from one end of the longitudinal outer side covering portion 35 towards the longitudinal outside. The contact portion 331 of the transverse outer side covering portion 33 is inserted into the second notch 1433, and the welding leg 332 is formed by vertically bending outwards longitudinally after being inserted into the third notch 1434. A bayonet 333 is further provided on the transverse outer side covering portion 33 to be inserted into the outer periphery of the bump 1432, enhancing the holding force between the plug reinforcement 30 and the plug guiding portion 14.

[0049] For key reference Figure 2 As shown, the plug terminal 20 includes a plug terminal welding leg 24 extending out of the top wall 11 in the longitudinal direction from the upper surface of the top wall 11, a plug terminal first contact portion 22 bent from the plug terminal welding 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 reversely from the lower end of the plug terminal first contact portion 22 and extending to the outer side surface of the plug side wall 12. A groove structure is provided on the plug terminal second contact portion 23. The free end of the plug terminal second contact portion 23 is bent towards the direction of the plug terminal first contact portion 22 to form an embedding end portion 25 embedded in the plug side wall 12. The embedding end portion 25 can prevent the plug terminal second contact portion 23 from separating from the outer side surface of the plug side wall 12.

[0050] Please continue to refer to Figure 1 、 Figure 2 、 Figure 7 、 Figure 8 As shown, 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 side walls 42 extending upwards from the longitudinal two sides of the bottom wall 41, an island portion 45 protruding upwards from the bottom wall 41 between the pair of socket side walls 42, a socket guiding portion 44 formed at the transverse two ends of the socket body 40, and a plug side wall receiving cavity 43 formed between the island portion 45 and the pair of socket side walls 42.

[0051] A plurality of terminal grooves 46 are formed in the bottom wall of the socket body 40 from bottom to top, and the socket terminals 50 are assembled upwardly into the terminal grooves 46. The socket terminals 50 include a support arm portion 51 extending into the terminal groove 46 at the bottom wall 41 and exposed at the bottom of the terminal groove 46, a second contact portion 52 of the socket terminal formed by bending and extending upward from the longitudinal outer side of the support arm portion 51 and located on the longitudinal side of the island portion 45 and facing the socket side wall 42, a first contact portion 53 of the socket terminal formed by bending upward from the longitudinal inner side of the support arm portion 51 and located on the longitudinal side of the socket side wall 42, a holding portion 54 formed by bending and extending reversely from the top end of the first contact portion 53, and a solder leg 55 formed by vertically bending from the lower end of the holding portion 54 and extending longitudinally outward to the lower surface of the bottom wall 41 of the socket body 40.

[0052] When the plug A is mated with the socket B, the island portion 45 is received in the island portion receiving cavity 13 of the plug A, the plug side wall 12 of the plug A is received in the plug side wall receiving cavity 43 of the socket B, and the plug guiding portion 14 is guided into the socket guiding portion 44. The plug terminal 20 is snapped 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 in electrical contact with the first and second contact portions 53 and 52 of the socket terminal 50 respectively.

[0053] Refer particularly to Figure 8 As shown, at the transverse two ends of the island portion 45 facing the socket guiding portion 44, there are provided protection portions 451. The protection portions 451 include a table surface portion 453 with a horizontal plane lower than that of the island portion 45, an avoidance inclined surface 452 formed by obliquely inclining downward from the table surface portion 453, a card slot 454 formed by recessing downward from the table surface portion 453, and a communication slot 455 formed by opening and communicating with the avoidance inclined surface 452 from the card slot 454 to the transverse outer side.

[0054] The socket guiding portion 44 includes outer peripheral walls 441, 442 and a plug guiding portion receiving cavity 443 located between the outer peripheral walls 441, 442. The outer peripheral wall 441 includes a longitudinal outer peripheral wall 441 and a pair of transverse outer peripheral walls 442 connected to both ends of the longitudinal outer peripheral wall 441, and the transverse outer peripheral walls 442 are connected to the socket side wall 42.

[0055] The plug guiding part receiving cavity 443 is formed with a through hole 4431 penetrating in the up-down direction corresponding to the laterally extending part of the island part 45, and the through hole 4431 extends all the way to the lower end of the longitudinal outer peripheral wall 441. First and second extension grooves 4411 and 4412 are respectively provided on the lateral outer side and the inner side of the longitudinal outer peripheral wall 441, and the second extension groove 4412 communicates with the through hole 4431. A support shoulder 4421 is formed by protruding upward in the middle of the longitudinal outer peripheral wall 442. An installation step part 4425 extending in the lateral direction and located longitudinally outside the support shoulder 4421, a communication step part 4426 separating the support shoulder 4421 from the socket side wall 42, and an elastic avoidance part 4424 extending in the lateral direction and located longitudinally inside the support shoulder 4421 are respectively provided on the outer periphery of the support shoulder 4421. The installation step part 4425, the communication step part 4426 and the elastic avoidance part 4424 communicate with each other to form a U-shaped step part. A low position groove 4423 and a high position platform 4422 are respectively provided on the top surface of the support shoulder 4421. The low position groove 4423 is close to the longitudinal outer peripheral wall 441 side, the high position platform 4422 is close to the communication step part 4426, and the horizontal position of the top surface of the high position platform 4422 is higher than the horizontal position of the surface of the low position groove 4423. A third extension groove 4428 is formed by penetrating the installation step part 4425 partially in the vertical direction.

[0056] Please continue to refer to Figures 9 to 13 As shown, the socket reinforcing member 60 includes a main body part 61 covering the top surface of the longitudinal outer peripheral wall 441 in the longitudinal direction, a longitudinal outer peripheral wall covering part 62 bent downward from the lateral outer end of the main body part 61 and extending into the first extension groove 4411, a central guiding part 63 bent downward from the lateral inner side of the main body part 61 and extending to the protected part 451 at the lateral end of the island part 45, a lateral outer peripheral wall covering part 64 bent downward from the longitudinal ends of the main body part 61 and extending along the installation step part 4425 and located longitudinally outside the lateral outer peripheral wall 442, and an elastic arm part 65 bent reversely from the free end of the lateral outer peripheral wall covering part 64 and extending to the elastic avoidance part 4424 through the communication step part 4426. The elastic arm part 65 can be bent and extended to the elastic avoidance part 4424 from any one of the lateral two ends of the lateral outer peripheral wall covering part 64. At the same time, in another embodiment, the elastic arm part 65 can also be bent reversely downward from the longitudinal ends of the lateral outer side of the main body part 61 and then extended to the elastic avoidance part 4424.

[0057] The free end 642 of the longitudinal outer wall covering portion 62 is fixed to the printed circuit board as a fillet weld, and the bottom end of the transverse outer wall covering portion 64 is extended to the printed circuit board through the third extension groove 4428 as a fillet weld for welding and fixing. On both longitudinal sides of the central guiding portion 63, the main body portion 61 is turned downwards towards the plug guiding portion receiving cavity 443 to form first and second arc-shaped guiding portions 611 and 612. The first arc-shaped guiding portion 611 is consistent with the guiding arc surface 636 formed by bending the central guiding portion 63 downwards from the main body portion 61.

[0058] The central guiding portion 63 includes a first central guiding arm 631 extending downwards and bending laterally from the lateral inner side of the main body portion 61 into the second extension groove 4412, a supporting bottom arm 632 bending laterally from the bottom of the first central guiding arm 631 and extending along the through port 4431 to the bottom of the protected portion 451 on both sides of the island portion 45, a second central guiding arm 634 extending obliquely upwards from the supporting bottom arm 632 above the protected portion 451, and a clamping end portion 635 bending downwards from the free end of the second central guiding arm 634 and clamping into the clamping groove 454. The first and second central guiding arms 631 and 634 are used to guide the insertion of the plug reinforcement 30 and protect the longitudinal outer wall 441 of the socket body 40 and the protected portions 451 at the two lateral ends of the island portion 45. The longitudinal outer side covering portion 35 and the longitudinal inner side covering portion 34 of the plug reinforcement 30 are respectively guided by the first and second central guiding arms 631 and 634 and enter between the first and second central guiding arms 631 and 634 above the supporting bottom arm 632. However, in the inserted state, the longitudinal outer side covering portion 35 and the longitudinal inner side covering portion 34 do not make electrical contact with the first and second central guiding arms 631 and 634. During the insertion process, the supporting bottom arm 632 is pressed to generate a supporting force with the mounted printed circuit board, making the first and second central guiding arms 631 and 634 have a certain elasticity.

[0059] The top of the transverse outer wall covering portion 64 is bent and extended towards the elastic arm portion 65 to form a protection portion 66 above the high platform 4422 supporting the supporting shoulder 4421. When the plug A is not inserted into the socket B, that is, when the socket B is in a natural state, when observing from top to bottom (i.e., Figure 11 as shown), the protection portion 66 does not cover the elastic arm portion 65. When the elastic arm portion 65 is squeezed longitudinally outwards by the contact portion 331 of the transverse outer side covering portion 33 of the plug reinforcement 30, at least a part of the elastic arm portion 65 is located below the protection portion 66.

[0060] In the natural state, the elastic arm portion 65 is located above the elastic avoidance portion 4424, and there is a deformation gap between the elastic arm portion 65 and the inner side surface of the support shoulder portion 4421. When the elastic arm portion 65 is longitudinally squeezed, the elastic arm portion 65 deforms within the deformation gap. The elastic arm portion 65 includes a tension portion 651 formed by reversely bending the free end of the transverse outer peripheral wall covering portion 64 in the transverse direction, an elastic main body arm 652 extending from the tension portion 651 in the transverse direction on the elastic avoidance portion 4424, a contact convex portion 653 protruding from the elastic main body arm 652 toward the plug guiding portion receiving cavity 443, and a hanging portion 654 formed by bending and extending from the top end of the elastic main body arm 652 toward the transverse outer peripheral wall covering portion 64. The hanging portion 654 is supported above the low position groove 4423 of the support shoulder portion 4421. The arc line of the bent portion of the hanging portion 654 is consistent with the second arc guiding portion 612 on the main body portion 61.

[0061] For key reference Figure 14 As shown, the horizontal position of the top surface of the protection portion 66 is higher than the horizontal position of the top surface of the hanging portion 654 (for key reference Figure 13 ), and the top surface of the hanging portion 654 is at the same horizontal position as the top surface of the main body portion 61. When observing from the side (as Figure 12 shown), the contact convex portion 653 is completely located within the plug guiding portion receiving cavity 443. When the plug A is inserted, the transverse outer side surface covering portion 33 of the plug reinforcement 30 first contacts the protection portion 66 and is guided to the correct position by the protection portion 66 toward the side of the plug guiding portion receiving cavity 443, and then continues to be pressed down. The plug reinforcement 30 longitudinally squeezes the elastic main body arm 652 along the inner edge of the hanging portion 654. The hanging portion 654 keeps the elastic main body arm 652 from being damaged by being rubbed and turned over downward. After the plug A is finally inserted, the elastic main body arm 652 is squeezed and deformed toward the support shoulder portion 4421 and provides an elastic force, and the contact convex portion 653 finally makes electrical contact with the contact portion 331 of the plug reinforcement 30 to transmit current. The plug reinforcement 30 and the socket reinforcement 60 transmit current through electrical contact between two contact portions 331 and two contact convex portions 653 in the longitudinal direction, and the current transmission capacity can reach 5 amperes.

[0062] The elastic variable of the elastic main body arm 652 is preferably such that the longitudinal movement of the hanging portion 654 does not exceed the longitudinal outer side surface of the transverse outer peripheral wall covering portion 64. An avoidance notch 643 is provided at the position corresponding to the hanging portion 654 on the transverse outer peripheral wall covering portion 64 in the longitudinal direction. When the plug A is inserted, the hanging portion 654 extends above the avoidance notch 643 on the transverse outer peripheral wall covering portion 64 without contacting it.

[0063] In this embodiment, a hanging portion 654 that is hung on the supporting shoulder portion 4421 is formed by bending and extending the elastic main body arm 652 longitudinally outward, and a protection portion 66 higher than the hanging portion 654 is formed by bending the top of the transverse outer peripheral wall covering portion 64 longitudinally inward to protect the elastic main body arm 652 from being damaged by the downward rubbing of the plug reinforcing member 30 when the plug is inserted.

[0064] Embodiment 2

[0065] Please continue to refer to Figures 16 to 18 As shown, it is the second embodiment of the board-to-board connector assembly of the present application. The board-to-board plug A of this embodiment is the same as that of Embodiment 1, and the difference lies only in some structures of the socket reinforcing member 60.

[0066] The difference between Embodiment 2 and Embodiment 1 is that: at the position of the hanging portion 654 corresponding to the transverse outer peripheral wall covering portion 64, the avoidance notch 643 in Embodiment 1 is cancelled, and a contact piece 644 is formed by protruding and extending upward from the position of the transverse outer peripheral wall covering portion 64 corresponding to the hanging portion 654, and the free end of the hanging portion 654 is stamped into a smaller contact tip. When the plug A is inserted into the socket B, the elastic main body arm 652 deforms longitudinally outward, forcing the contact tip 655 of the hanging portion 654 to extend toward the contact piece 644 and finally make electrical contact. In this way, the transmission of current can be directly transmitted from the contact portion 331 of the socket reinforcing member 60 through the contact convex portion 653 of the socket reinforcing member 60 to the contact piece 644 on the transverse outer peripheral wall covering portion 64, and finally transmitted to the printed circuit board through the solder pad 642 at the bottom of the transverse outer peripheral wall covering portion 64. This transmission path is defined as the first transmission path. Thus, the current does not need to be transmitted separately through the path of the contact convex portion 653, the elastic main body arm 652, the tensioning portion 651, and the transverse outer peripheral wall covering portion 64. This transmission path is defined as the second transmission path. Thereby, multi-path parallel transmission between the plug A and the socket B is realized, the heat generation phenomenon is reduced, and the current-carrying capacity is improved.

[0067] The length of the upward extension of the contact piece 644 is preferably not exceeding the upper surfaces of the main body portion 61 and the protection portion 66. The ability of the contact piece 644 to deform longitudinally outward is retained to protect the hanging portion 654 and the contact piece 644 from being damaged due to misinsertion.

[0068] In this second embodiment, by forming a contact piece 644 by extending upward at the position of the transverse outer peripheral wall covering portion 64 corresponding to the hanging portion 654, when the elastic main body arm 652 deforms longitudinally outward when the plug A is inserted, the free end of the hanging portion 654 makes electrical contact with the contact piece 644, realizing multi-path current transmission, which is beneficial to improving the current-carrying capacity of the socket reinforcing member 60.

[0069] During the simulated temperature rise test, when the current passing through both Example 1 and Example 2 was 5 amperes, the temperature rise of Example 1 was 20.4 degrees Celsius, and the temperature rise of Example 2 was 17.4 degrees Celsius.

[0070] Example 3

[0071] Please continue to refer to Figures 19 to 21 As shown, this embodiment is one of the alternative solutions of Example 2. The difference compared with Example 2 is as follows:

[0072] The first and second arc surface guiding parts 611 and 612 are formed by bending the inner side of the main body part 61, and the excision is cancelled; and a clamping piece 613 is formed by bending the inner side of the main body part 61 downward. Clamping notches 4413 are formed on the longitudinal outer peripheral wall of the socket body 40 on the longitudinal two sides of the second extension groove 4412. The clamping piece 613 is buckled into the clamping notch 4413 to strengthen the bonding strength between the socket reinforcing member 60 and the socket body 40. A guiding arc surface consistent with the guiding arc surface 636 of the central guiding part 63 is formed at the bending part of the clamping piece 613 and the main body part 61.

[0073] Viewing the socket reinforcing member 60 from the left side, at least a part of the clamping piece 613 is covered by the elastic main body arm 652. Except for the guiding arc surface 636 and the part of the clamping piece 613 located at the edge of the plug guiding part receiving cavity 443 on the main body part 61, no other part is located on the edge of the plug guiding part receiving cavity 443. The width of the bottom surface of the clamping notch 4413 is greater than or equal to the thickness of the free end of the clamping piece 613, so that the free end of the clamping piece 613 will not protrude into the plug guiding part receiving cavity 443.

[0074] The purpose of this technical solution is that during the manufacturing process of the first and second arc surface guiding parts 611 and 612 of Example 1 and Example 2, due to tolerance problems, the bottom edges may protrude into the plug guiding part receiving cavity 443, resulting in scratches between the plastic on the longitudinal outer side surface 142 of the plug body 10 and the first and second arc surface guiding parts 611 and 612 when the plug A is pulled out, generating plastic debris, which will further cover the contact performance and lead to poor contact or poor plugging and unplugging.

[0075] In this embodiment, clamping notches 4413 are formed on the inner side of the longitudinal outer peripheral wall 442 of the socket body 40, and then a clamping piece 613 buckling on the clamping notches 4413 is formed by bending the inner side of the main body part 61 downward. The free end of the clamping piece 613 is located above the bottom surface of the clamping notch 4413 and will not protrude into the plug guiding part receiving cavity 443, avoiding the generation of plastic debris caused by rubbing against the longitudinal outer side surface 142 of the plug body 10 and affecting the use of the product.

[0076] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various modifications and changes can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims

1. A board-to-board socket, comprising a socket body, socket terminals and a socket reinforcement member. The socket body includes a bottom wall, socket side walls protruding upward from both longitudinal ends of the bottom wall, socket guiding portions formed at both transverse ends of the socket body, and an island portion protruding upward from the bottom wall. The socket guiding portion includes a plug guiding portion receiving cavity, a longitudinal outer peripheral wall located laterally outside the plug guiding portion receiving cavity, and a pair of transverse outer peripheral walls located on both longitudinal sides of the plug guiding portion receiving cavity. The socket reinforcement member includes a main body portion covering the surface of the longitudinal outer peripheral wall, a transverse outer peripheral wall covering portion extending laterally from both longitudinal sides of the main body portion to cover the outside of the transverse outer peripheral wall, and an elastic arm portion extending from the transverse outer peripheral wall covering portion to the side of the transverse outer peripheral wall close to the plug guiding portion receiving cavity. The top of the elastic arm portion is bent and extended laterally outward to form a hanging portion hanging on the top surface of the transverse outer peripheral wall, characterized in that, A clamping notch is formed on the inner side of the longitudinal outer peripheral wall. A clamping piece that is formed by bending the transverse inner side of the main body portion downward is inserted into the clamping notch. A longitudinal outer peripheral wall covering portion that covers the outer side surface of the longitudinal outer peripheral wall is formed by bending the transverse outer side of the main body portion downward. The width of the bottom surface of the clamping notch is greater than or equal to the thickness of the free end of the clamping piece so that the free end of the clamping piece is located above the bottom surface of the clamping notch and will not protrude into the plug guiding portion receiving cavity. The elastic arm portion includes an elastic main body arm that protrudes toward the plug guiding portion receiving cavity to form a contact convex portion. When viewed from top to bottom, at least a part of the contact convex portion is located in the plug guiding portion receiving cavity. The contact convex portion is in electrical contact with the plug reinforcement. The transmission of current includes the following two paths: one path is along the contact convex portion, the hanging portion, the contact piece, and the welding leg at the bottom of the longitudinal outer peripheral wall covering portion; the other path is along the contact convex portion, the elastic main body arm, the tensioning portion, and the welding leg at the bottom of the longitudinal outer peripheral wall covering portion. The two current transmission paths are transmitted in parallel.

2. The board-to-board socket according to claim 1, wherein When observing the socket reinforcement in the transverse direction, at least a part of the clamping piece is covered by the elastic arm portion.

3. The board-to-board socket according to claim 1, characterized in that, A contact piece is formed at the position of the longitudinal outer peripheral wall covering portion corresponding to the hanging portion. When the plug and the socket are successfully mated, the plug reinforcement squeezes the elastic arm portion along the longitudinal outer side and forces the hanging portion to move outward in the longitudinal direction to be in electrical contact with the contact piece. At the same time, the plug reinforcement is in electrical contact with the elastic arm portion.

4. The board-to-board socket according to claim 3, characterized in that, The bottom of the longitudinal outer peripheral wall covering portion is fixed to the printed circuit board as a welding leg. The transmission of current is conducted from the plug reinforcement through the hanging portion to the welding leg of the longitudinal outer peripheral wall covering portion.

5. The board-to-board socket according to claim 4, characterized in that, The transverse outer peripheral wall of the socket body includes a supporting shoulder portion and an elastic avoidance portion that is located longitudinally inside the supporting shoulder portion and communicates with the plug guiding portion receiving cavity. The elastic arm portion can elastically deform in the longitudinal direction in the elastic avoidance portion.

6. The board-to-board socket according to claim 5, wherein An installation step portion is formed on the longitudinal outer side of the supporting shoulder portion. The transverse outer peripheral wall covering portion extends on the installation step portion.

7. The board-to-board socket according to claim 6, characterized in that, The supporting shoulder portion forms a connecting step portion that communicates with the elastic avoidance portion at least at one end in the transverse direction. The elastic arm portion includes a tensioning portion that is bent from one transverse end of the transverse outer peripheral wall covering portion and extends on the connecting step portion, and the elastic main body arm that at least partially extends on the elastic avoidance portion in the transverse direction from the tensioning portion. The hanging portion is bent outward in the longitudinal direction from the top end of the elastic main body arm and is hung above the supporting shoulder portion.

8. The board-to-board socket according to claim 7, wherein, The top end of the transverse outer peripheral wall covering portion is bent toward the plug guiding portion receiving cavity direction to form a protection portion that supports on the supporting shoulder portion. A high platform is formed at the top of the supporting shoulder portion near the connecting step portion. A low groove adjacent to the high platform is also formed on the top of the supporting shoulder portion. The protection portion supports on the high platform. The hanging portion supports in the low groove. The horizontal position of the surface of the low groove is lower than the horizontal position of the surface of the high platform. The upper surface of the hanging portion is lower than the upper surface of the protection portion.

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