Board-to-board connector

Abstract

A board-to-board connector for electrically connecting to a mating circuit board includes an insulating body, a plurality of conductive terminals arranged along a length direction of the insulating body, and a protection frame coupled to both ends of the length direction of the insulating body and located outside a range of the plurality of conductive terminals. The protection frame includes an upper end wall portion coupled to upper surfaces of both ends of the length direction of the insulating body and located outside the range of the plurality of conductive terminals, a mating foot portion for fixing with the mating circuit board, and a main body portion fixed with the insulating body. The protection frame further includes a resilient arm portion extended from the mating foot portion for elastically contacting with a mating connector. The socket connector of the present application has better structural stability.

Description

TECHNICAL FIELD

[0001] The application relates to a board-to-board connector. BACKGROUND

[0002] The board-to-board connector is generally composed of a plug and a socket, both of which are composed of a plastic body and a conductive terminal fixed on the plastic body. The plastic body mainly plays the role of insulation and positioning of the conductive terminal, and the conductive terminal mainly plays the role of signal transmission. Generally, the plug and the socket of the existing board-to-board connector also increase a protective bracket to improve the strength of the board-to-board connector, and the protective bracket can also play the role of holding force when the plug and the socket are docked. In some prior art, the protective bracket can also be used as a current terminal. Therefore, the requirements for the combination strength of the protective bracket and the plastic body, the arm length of the elastic arm on the protective bracket, the overall structural strength and stability of the board-to-board connector combined with the protective bracket are relatively high, especially in the design trend of smaller and smaller board-to-board connectors.

[0003] Therefore, it is necessary to propose a new design form to achieve better effects. SUMMARY

[0004] The application aims to provide a new board-to-board connector with better structural stability.

[0005] The application is achieved by the following technical scheme:

[0006] A board-to-board connector for electrically connecting to a docking circuit board, comprising an insulating body, a plurality of conductive terminals and a protective bracket, the plurality of conductive terminals are arranged on the insulating body along the length direction of the insulating body, the protective bracket is combined with both ends of the length direction of the insulating body and located outside the arrangement range of the plurality of conductive terminals,

[0007] The protective bracket comprises an upper end wall part, a docking foot part and a main body part,

[0008] The upper end wall part is combined with the upper surface of both ends of the length direction of the insulating body and located outside the arrangement range of the plurality of conductive terminals, the docking foot part is used for fixing with the docking circuit board, and the main body part is fixed with the insulating body,

[0009] The protective bracket further comprises an elastic arm part formed by extending from the docking foot part, and the elastic arm part is used for elastically contacting with a docking connector.

[0010] Further, the insulating body is formed with a plug-in space and comprises a bottom wall abutting against the docking circuit board and two side walls upwardly extending from both sides of the bottom wall along the length direction of the bottom wall, and the plurality of conductive terminals are arranged on the two side walls respectively.

[0011] Further, the docking leg integrally connects the elastic arm portion with the main body portion, and the main body portion integrally connects the upper end wall portion and the docking leg.

[0012] Further, the elastic arm portion is combined to at least a portion of the inner wall surface of the side wall, at least a portion of the elastic arm portion is elastically displaceable in the width direction of the insulation body, and the elastic arm portion is formed with a contact portion which at least partially protrudes into the insertion space in the width direction of the insulation body.

[0013] Further, the main body portion includes an outer wall portion which is combined to the outer wall surface position of the end portion of the side wall in the length direction, the docking leg is formed by the outer wall portion extending by bending adjacent to the edge of the docking circuit board, and the elastic arm portion is formed by the edge of the docking leg extending by bending.

[0014] Further, in the width direction of the insulation body, the elastic arm portion is formed by the docking leg extending by bending from the side of the outer wall portion away from the docking leg, and the outer wall portion and the elastic arm portion are oppositely arranged in the width direction of the insulation body.

[0015] Further, the elastic arm portion includes a first elastic arm portion which is integrally connected to the docking leg, a bending arm portion which integrally connects the first elastic arm portion and a second elastic arm portion, the first elastic arm portion and the second elastic arm portion are formed with a step in the width direction of the insulation body, the spacing between the first elastic arm portion and the outer wall portion is smaller than the spacing between the second elastic arm portion and the outer wall portion, in the length direction of the insulation body, the first elastic arm portion is close to the end portion of the side wall, the second elastic arm portion is away from the end portion of the side wall, and the contact portion is formed on the second elastic arm portion.

[0016] Further, the elastic arm portion is formed by the docking leg extending by bending from one end in the length direction of the insulation body, the elastic arm portion includes an elastic arm and a bending arm, the elastic arm and the outer wall portion are oppositely arranged in the width direction of the insulation body, the bending arm is used to connect the elastic arm and the docking leg, and the contact portion is formed on the elastic arm.

[0017] Further, the bending arm is located at the end edge position in the length direction of the insulation body, and the extension plane of the bending arm is perpendicular to the extension plane of the elastic arm.

[0018] Further, the elastic arm portion is formed by the docking leg extending by bending from one end in the length direction of the insulation body, the elastic arm portion includes a bending wall, a beam wall and an elastic arm, the elastic arm and the outer wall portion are oppositely arranged in the width direction of the insulation body, the beam wall is located between the upper end wall portion and the upper surface of the side wall, and the beam wall is oppositely arranged with the docking leg in the insertion and extraction direction of the docking connector.

[0019] Further, a gap is formed between the crossbeam wall and the upper end wall portion along the plug-in direction of the docking connector, and a gap is formed between the crossbeam wall and the side wall, and the crossbeam wall can be elastically deformed along the plug-in direction of the docking connector.

[0020] Further, the insulating body further comprises two end walls formed by extending upwards along the width direction of the bottom wall on both sides of the bottom wall, the bottom wall, the two side walls, and the two end walls jointly define an insertion space with an opening upwards, the upper end wall portion comprises an integral side wall upper wall portion and an end wall upper wall portion, the side wall upper wall portion is combined with the upper surface of the end portion of the side wall along the length direction, and the end wall upper wall portion is combined with the upper surface of the end wall, at least one end edge of the end wall upper wall portion is bent downwards to extend to form an end wall shielding portion along the length direction of the insulating body, the end wall shielding portion is combined with the outer surface and / or the inner surface of the end wall, and the lower edge of the end wall shielding portion forms a docking foot portion corresponding to the fixation of the docking circuit board.

[0021] Compared with the prior art, the board-to-board connector has better structural stability. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a perspective view of the first embodiment of the board-to-board connector of the present application;

[0023] Figure 2 is a partial exploded perspective view of the first embodiment of the board-to-board connector of the present application, which specifically shows a perspective view of one of the protection frames separated from the insulating body;

[0024] Figure 3 is a partial exploded perspective view of the first embodiment of the board-to-board connector of the present application, which specifically shows a perspective view of one of the protection frames and the support frame separated from the insulating body;

[0025] Figure 4 is Figure 3 is a perspective view from another angle;

[0026] Figure 5 is Figure 1 is a sectional view along line A-A in FIG. 6;

[0027] Figure 6 is Figure 5 is a front view of the sectional view shown in FIG. 6 along the length direction of the insulating body;

[0028] Figure 7 is a perspective view of another embodiment of the protection frame of the board-to-board connector of the present application;

[0029] Figure 8 is Figure 7 is a perspective view from another angle of the protection frame in FIG. 7;

[0030] Figure 9 is Figure 7 a bottom view of the protection frame in the middle;

[0031] Figure 10 is a perspective view of a second embodiment of the board-to-board connector of the present application;

[0032] Figure 11 is a sectional view of the B-B line in the middle; Figure 10

[0033] Figure 12 is a partial exploded view of the second embodiment of the board-to-board connector of the present application, which specifically shows a perspective view of one of the protection frames separated from the insulating body;

[0034] Figure 13 is Figure 12 a perspective view from another angle.

DETAILED DESCRIPTION

[0035] Hereinafter, specific embodiments of the board-to-board connector of the present application will be described with reference to the accompanying drawings. Figures 1 to 13 Hereinafter, specific embodiments of the board-to-board connector of the present application will be described with reference to the accompanying drawings.

[0036] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0037] In addition, in the description of the application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "combining" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the application can be understood according to the specific circumstances.

[0038] In the description of the present application, it should be understood that the terms "including" and "having" and any variations thereof used in the present text are intended to be combined with non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0039] Reference will be made to Figures 1 to 6 ​As shown, the first embodiment of the board-to-board connector disclosed in the present application is used for electrically connecting to a mating circuit board, the board-to-board connector comprises an insulating body 1, a plurality of conductive terminals 2 arranged on the insulating body 1 along the length direction of the insulating body 1, and a protection frame 3 combined with both ends of the length direction of the insulating body 1 and located outside the arrangement range of the plurality of conductive terminals 2.

[0040] As shown in Figures 1 to 6 As shown, the insulating body 1 is formed with a plug-in space 10 and comprises a bottom wall 11 abutting the mating circuit board, two side walls 12 upwardly extending on both sides of the bottom wall 11 along the length direction of the bottom wall 11, two end walls 13 upwardly extending on both sides of the bottom wall 11 along the width direction of the bottom wall 11, and an island wall 14 upwardly extending from the middle position of the bottom wall 11, and a plurality of conductive terminals 2 are arranged on the two side walls 12 respectively. The bottom wall 11, the two side walls 12, the two end walls 13 and the island wall 14 jointly define the plug-in space 10 with an opening upward.

[0041] As shown in Figures 1 to 6 As shown, each of the protection frames 3 comprises a first protection frame 301 and a second protection frame 302, the first protection frame 301 and the second protection frame 302 are independent of each other, the first protection frame 301 is combined with the insulating body 1 by integral molding, and the second protection frame 302 is combined with the insulating body 1 by assembly.

[0042] As shown in Figures 2 to 6 As shown, the first protection frame 301 is formed with an island wall protection part 3011 embedded on the end surface of the length direction of the island wall 14. The island wall protection part 3011 is used to protect the structural strength of the island wall 14, and at the same time can protect the island wall 14 from being scratched and damaged when the mating connector is inserted. The upper end edge of the end away from the mating circuit board of the island wall protection part 3011 is further folded back and extended to form an embedding part 3014 corresponding to being embedded in both ends of the length direction of the island wall 14, and the embedding part 3014 adjacent to one end of the mating circuit board is further extended to form an embedding abutting part 3015 protruding to the outside of the lower surface of the bottom wall 11. The embedding part 3014 is used to increase the bonding strength of the first protection frame 301 and the insulating body 1, and the embedding abutting part 3015 is used for positioning the first protection frame 301 by the mold core during integral molding, and at the same time the embedding abutting part 3015 can be used for welding and fixing with the mating connector.

[0043] Further, the first protection frame 301 further comprises a bottom wall supporting part 3012 integrally connected with the lower end of the island wall protection part 3011, which is embedded in the both ends of the length direction of the bottom wall 11, and is exposed upward to the plug-in space 10, and is exposed downward to the lower surface of the bottom wall 11 abutting against the circuit board for the positioning of the mold core during the integral molding. The bottom wall supporting part 3012 is used to increase the structural strength of the bottom wall.

[0044] Further, the first protection frame 301 comprises a side wall protection part 3013 integrally connected with the bottom wall supporting part 3012, which is embedded in the inner wall surface of the both ends of the length direction of the side wall 12 and is located outside the arrangement range of the conductive terminals 2. The side wall protection part 3013 is bent at the end away from the circuit board to form a positioning part 3016, which is embedded in the upper surface of the side wall 12 away from the circuit board, and at least partially exposed to the upper surface of the side wall 12 to form a positioning upper surface 30161, and the both ends of the width direction of the insulating body 1 are recessed upward on the lower surface to form a positioning groove 111, and the positioning part 3016 is at least partially exposed downward outside the insulating body 1 through the positioning groove 111 to form a positioning lower surface 30162. The positioning upper surface 30161 and the positioning lower surface 30162 are used for the positioning of the mold core during the integral molding, and the positioning part 3016 can also be used to guide the insertion of the mating connector into the plug-in space 10, and the side wall protection part 3013 can also strengthen the structural strength of the side wall.

[0045] Further, the first protection frame 301 further comprises an end wall protection part 3017 embedded in the inner wall surface of the end wall 13, which is integrally connected with the bottom wall supporting part 3012, and the end away from the circuit board is further bent and extended to form an end wall abutting part 3018 protruding outside the end wall 13. The end wall protection part 3017 is used to increase the structural strength of the end wall 13, and the end wall abutting part 3018 is used for the positioning of the mold core during the integral molding, and the end wall abutting part 3018 is also the connecting position of the material belt. In some embodiments, the end wall abutting part 3018 can also be used for electrical contact with the second protection frame 302. Along the plug-in direction of the mating connector, the first protection frame 301 partially overlaps with the second protection frame 302, and in this application, specifically, the protection part 3017 and the end wall abutting part 3018 partially overlap with the end wall upper wall part 312 described below along the plug-in direction of the mating connector.

[0046] In the present application, by setting the first protective frame 301, the strength of the insulating body 1 is strengthened, especially the structural strength of the two end positions of the length direction of the insulating body 1, and at the same time, the first protective frame 301 is designed to have a combined structure with the bottom wall 11, the side wall 12, the end wall 13 and the island wall 13, so that the overall structural strength between the bottom wall 11, the side wall 12, the end wall 13 and the island wall 13 is guaranteed, and at the same time, the inner wall surface of the corresponding position of the bottom wall 11, the side wall 12, the end wall 13 and the island wall 13 is strengthened, which can effectively prevent the damage of the insulating body 1 caused by the insertion of the mating connector.

[0047] Please refer to Figures 2 to 4 As shown in the figure, the second protective frame 302 includes an upper end wall part 31, a mating foot part 32 and a main body part (not numbered). The upper end wall part 31 is combined with the upper surface of the two ends of the length direction of the insulating body 1 and is located outside the arrangement range of the plurality of conductive terminals 2. The mating foot part 32 is used to be fixed with the mating circuit board. The main body part is fixed with the insulating body 1. The second protective frame 302 further includes an elastic arm part 34 formed by extending from the mating foot part 32, and the elastic arm part 34 is used to elastically contact with the mating connector (not shown).

[0048] Please refer to Figures 2 to 4 As shown in the figure, specifically, the mating foot part 32 integrally connects the elastic arm part 34 and the main body part, and the main body part integrally connects the upper end wall part 31 and the mating foot part 32. The elastic arm part 34 is combined with at least part of the inner wall surface of the side wall 12, at least part of the elastic arm part 34 can be elastically displaced along the width direction of the insulating body 1, and the elastic arm part 34 is formed with a contact part 3404 which at least partially protrudes into the plug-in space 10 along the width direction of the insulating body 1. The contact part 3404 is used to realize electrical connection with the mating connector.

[0049] Please refer to Figure 2 and Figure 3 As shown in the figure, the main body part includes an outer wall part 331 which is combined with the outer wall surface position of the end part of the length direction of the side wall 12, the mating foot part 32 is formed by bending and extending from the outer wall part 331 adjacent to the edge of the mating circuit board, and the elastic arm part 34 is formed by bending and extending from the edge of the mating foot part 32. Along the width direction of the insulating body 1, the elastic arm part 34 is formed by bending and extending from the side of the mating foot part 32 away from the outer wall part 331, the elastic arm part 34 extends along the length direction of the insulating body 1, and the outer wall part 331 and the elastic arm part 34 are oppositely arranged along the width direction of the insulating body 1.

[0050] Please refer to Figure 4As shown, the elastic arm part 34 includes a first elastic arm part 3401 integrally connected with the docking foot part 32, a bending arm part 3403, and a second elastic arm part 3402. The bending arm part 3403 integrally connects the first elastic arm part 3401 with the second elastic arm part 3402. The first elastic arm part 3401 and the second elastic arm part 3402 form a step along the width direction of the insulation body 1. The distance between the first elastic arm part 3401 and the outer wall part 331 is smaller than the distance between the second elastic arm part 3402 and the outer wall part 331. Along the length direction of the insulation body 1, the first elastic arm part 3401 is close to the end of the side wall 12, the second elastic arm part 3402 is away from the end of the side wall 12, and the contact part 3404 is formed on the second elastic arm part 3402.

[0051] Please refer to Figures 1 to 4 As shown, the upper end wall part 31 includes a side wall upper wall part 311 and an end wall upper wall part 312 integrally connected. The side wall upper wall part 311 is combined with the upper surface of the end of the side wall 12 along the length direction. The end wall upper wall part 312 is combined with the upper surface of the end wall 13. Along the length direction of the insulation body 1, at least one end edge of the end wall upper wall part 312 extends downward to form an end wall shielding part 3121. The end wall shielding part 3121 is combined with the outer surface and / or the inner surface of the end wall 13. The lower edge of the end wall shielding part 3121 forms a docking foot part 31211. The docking foot part 31211 corresponds to the fixing of the docking circuit board.

[0052] Please refer to Figures 1 to 6 As shown, further, the upper surface of the upper end wall part 31 of the second protection frame 302 is higher than the first protection frame 301 and the upper surface of the side wall 12 to form a step, and the upper end wall part 31 is adjacent to the inner side of the insertion space 10 and has an arc-shaped guide surface 3101 formed by the drawing process. In this way, the first protection frame 301 can protect the board-to-board connector as the first layer of protection, and at the same time, when the docking connector is inserted into the board-to-board connector for docking, it first contacts and is guided by the first protection frame 301. The second protection frame 302 plays a role of secondary guidance and protection. In addition, the protection frame 3 is designed in two pieces, wherein the first protection frame 301 is fixed by being integrally formed with the insulation body 1, and the second protection frame 302 is fixed by being assembled with the insulation body 1, which can reduce the processing difficulty. Because a single element (the protection frame 3) with too complex structure is not conducive to processing and manufacturing, assembly with the insulation body 1, and function realization on the one hand, and on the other hand, the two-piece design according to the functional requirements of the protection frame 3 in different positions can better meet the overall performance requirements, while reducing the processing difficulty and the process technology.

[0053] Please refer toFigure 7 , Figure 8 and Figure 9 The diagram shows another embodiment of the second protective frame 302 of the board-to-board connector of this application. This embodiment differs from the second protective frame 302 in the structure of the elastic arm 34 and the connection position between the elastic arm 34 and the mating foot 32. Specifically, the elastic arm 34 is formed by bending and extending one end of the mating foot 32 along the length of the insulating body 1. The elastic arm 34 includes an elastic arm 341 and a bent arm 342. The elastic arm 341 and the outer wall portion 331 are disposed opposite each other along the width of the insulating body 1. The bent arm 342 is used to connect the elastic arm 341 and the mating foot 32. The contact portion 3404 is formed on the elastic arm 341. Furthermore, the bent arm 342 is located at the end edge of the insulating body 1 along the length direction, and the extension plane of the bent arm 342 is perpendicular to the extension plane of the elastic arm 341. Apart from this, the other structures of the second protective frame 302 are the same as those of the first embodiment. The reference numerals of the structures corresponding to the first embodiment are shared in the drawings. The second protective frame 302 disclosed in this embodiment can also be combined with the insulating body 1 described in the first embodiment.

[0054] Please refer to Figures 10 to 13 As shown, this is the second embodiment of the board-to-board connector of this application. The main difference between the second embodiment and the first embodiment is the structure of the second protective frame 302. Furthermore, the main difference in the second protective frame 302 is the structure of the elastic arm 34 and the connection position between the elastic arm 34 and the mating foot 32. Specifically, the elastic arm 34 includes a bent wall 342, a crossbeam wall 343 and an elastic arm 341. The bent wall 342 is formed by bending and extending the mating foot 32 upward along one end edge of the insulating body 1 in the length direction. The crossbeam wall 343 is formed by further bending and extending the bent wall 342. The crossbeam wall 343 is located between the upper end wall portion 31 and the upper surface of the side wall 12. The crossbeam wall 343 is arranged opposite to the mating foot portion 32 along the insertion and removal direction of the mating connector and opposite to the upper end wall portion 31. The elastic arm 341 is formed by bending and extending one side edge of the crossbeam wall 343 adjacent to the insertion space 10. The elastic arm 341 and the outer wall portion 331 are arranged opposite to each other along the width direction of the insulating body 1.

[0055] In the second embodiment, further, along the insertion and removal direction of the mating connector, a gap is formed between the crossbeam wall 343 and the upper end wall 31, and a gap is formed between the crossbeam wall 343 and the side wall 12, and the crossbeam wall 343 can elastically displace along the insertion and removal direction of the mating connector.

[0056] The insulating body 1 in the second embodiment is basically the same as the first embodiment, only the position corresponding to the elastic arm 34 is adjusted in structure, and other structures in the second embodiment are the same as the first embodiment. The structure corresponding to the first embodiment shares the same reference number in the drawings, and will not be described here.

[0057] In the embodiments disclosed in the present application, the docking foot 32 of the second protection frame 302 is used to be fixed with the docking circuit board welding machine. The elastic arm 34 is designed to be directly bent and extended from the docking foot 32, so that the elastic displacement of the elastic arm 34 is not affected or interfered by other structures. When the docking connector is docked with the board-to-board connector, the pressure and impact of the docking connector on the second protection frame 302 will not be transmitted to the elastic arm 34. Especially when the docking connector collides with the upper end wall 31, the elastic deformation or plastic deformation of the upper end wall 31 will not be transmitted to the elastic arm 34 due to the outer wall 331. Therefore, the position of the elastic arm 34 can be kept in a controllable range, thereby improving the contact stability of the docking connector and the board-to-board connector when they are docked, especially the docking stability of the elastic arm 34 of the second protection frame 302 and the docking connector.

[0058] In addition to the above differences, other structures in the second embodiment are basically the same as the first embodiment, and will not be described again. The structure description in the specification and the structure reference number in the drawings are equally applicable.

[0059] In summary, the above is only a preferred embodiment of the present application, and should not limit the scope of the present application. Any simple equivalent changes and modifications made in accordance with the claims and description of the present application shall still belong to the present application.

Claims

1. A board-to-board connector for electrically connecting to a mating circuit board, comprising an insulating body, a plurality of conductive terminals arranged on the insulating body along a length direction of the insulating body, and a protection frame coupled to both ends of the length direction of the insulating body and located outside a range in which the plurality of conductive terminals are arranged, characterized in that: the protection frame comprises an upper end wall portion, a mating leg portion, and a main body portion, the upper end wall portion is coupled to an upper surface of both ends of the length direction of the insulating body and located outside the range in which the plurality of conductive terminals are arranged, the mating leg portion is used for fixing with the mating circuit board, and the main body portion is fixed with the insulating body, the protection frame further comprises an elastic arm portion formed by extending from the mating leg portion, and the elastic arm portion is used for elastically contacting with a mating connector; the elastic arm portion is formed by extending from the mating leg portion along one end of the length direction of the insulating body, the elastic arm portion comprises an elastic arm and a bending arm, and the bending arm is used for connecting the elastic arm and the mating leg portion; the insulating body is formed with a plug-in space and comprises a bottom wall abutting against the mating circuit board and two side walls upwardly extending from both sides of the bottom wall along a length direction of the bottom wall, and the conductive terminals are arranged on the side walls; the main body portion comprises an outer wall portion coupled to an outer wall surface position of an end portion of the side wall along the length direction, the mating leg portion is formed by extending from the outer wall portion adjacent to an edge of the mating circuit board, and the elastic arm portion is formed by extending from the edge of the mating leg portion.

2. A board-to-board connector for electrically connecting to a mating circuit board, comprising an insulating body, a plurality of conductive terminals arranged on the insulating body along a length direction of the insulating body, and a protection frame coupled to both ends of the length direction of the insulating body and located outside a range in which the plurality of conductive terminals are arranged, characterized in that: the protection frame comprises an upper end wall portion, a mating leg portion, and a main body portion, the upper end wall portion is coupled to an upper surface of both ends of the length direction of the insulating body and located outside the range in which the plurality of conductive terminals are arranged, the mating leg portion is used for fixing with the mating circuit board, and the main body portion is fixed with the insulating body, the protection frame further comprises an elastic arm portion formed by extending from the mating leg portion, and the elastic arm portion is used for elastically contacting with a mating connector; the elastic arm portion comprises a first elastic arm portion integrally connected with the mating leg portion, a bending arm portion, and a second elastic arm portion, the bending arm portion integrally connects the first elastic arm portion and the second elastic arm portion, the first elastic arm portion and the second elastic arm portion form a stepped portion along a width direction of the insulating body, the insulating body is formed with a plug-in space and comprises a bottom wall abutting against the mating circuit board and two side walls upwardly extending from both sides of the bottom wall along a length direction of the bottom wall, along the length direction of the insulating body, the first elastic arm portion is close to an end portion of the side wall, and the second elastic arm portion is away from the end portion of the side wall.

3. The board-to-board connector according to claim 1 or 2, characterized in that: the mating leg portion integrally connects the elastic arm portion and the main body portion, and the main body portion integrally connects the upper end wall portion and the mating leg portion. ​ ​ ​ ​ ​ ​ ​ ​ ​ 4. The board-to-board connector according to claim 1 or 2, wherein: the elastic arm portion is joined to at least a portion of an inner wall surface of the side wall, at least a portion of the elastic arm portion is elastically displaceable in a width direction of the insulating body, and the elastic arm portion is formed with a contact portion that at least partially projects into the mating space in the width direction of the insulating body.

5. The board-to-board connector according to claim 2, wherein: the main body portion includes an outer wall portion that is joined to a position of an outer wall surface of the side wall along the length direction, the mating leg portion is formed by the outer wall portion extending bent adjacent to an edge of the mating circuit board, and the elastic arm portion is formed by the edge of the mating leg portion extending bent.

6. The board-to-board connector according to claim 5, wherein: in the width direction of the insulating body, the elastic arm portion is formed by the edge of the mating leg portion extending bent away from the outer wall portion, and the outer wall portion and the elastic arm portion are disposed opposite each other in the width direction of the insulating body.

7. The board-to-board connector according to claim 2, wherein: a distance between the first elastic arm portion and the outer wall portion is smaller than a distance between the second elastic arm portion and the outer wall portion, and the second elastic arm portion is formed with a contact portion that at least partially projects into the mating space in the width direction of the insulating body for contacting the mating connector.

8. The board-to-board connector according to claim 1 or 2, wherein: the elastic arm portion and the outer wall portion are disposed opposite each other in the width direction of the insulating body, and the elastic arm portion is formed with a contact portion that at least partially projects into the mating space in the width direction of the insulating body for contacting the mating connector.

9. The board-to-board connector according to claim 1, wherein: the bent arm is located at a position of an end edge of the insulating body in the length direction, and an extension plane of the bent arm is perpendicular to an extension plane of the elastic arm.

10. The board-to-board connector according to claim 5, wherein: the elastic arm portion is formed by the edge of the mating leg portion extending bent in the length direction of the insulating body, the elastic arm portion includes a bent wall, a beam wall, and an elastic arm, the elastic arm and the outer wall portion are disposed opposite each other in the width direction of the insulating body, and the beam wall is located between the upper end wall portion and an upper surface of the side wall, and the beam wall is disposed opposite the mating leg portion in a direction of insertion and extraction of the mating connector.

11. The board-to-board connector according to claim 10, wherein: in the direction of insertion and extraction of the mating connector, a gap is formed between the beam wall and the upper end wall portion, and a gap is formed between the beam wall and the side wall, and the beam wall is elastically displaceable in the direction of insertion and extraction of the mating connector.

12. The board-to-board connector according to claim 1 or 2, wherein: The insulating body further comprises two end walls formed by extending upward along the width direction of the bottom wall on both sides of the bottom wall, the bottom wall, the two side walls and the two end walls jointly define an insertion space with an opening upward, the upper end wall part comprises an integral connection of the side wall upper wall part and the end wall upper wall part, the side wall upper wall part is combined with the upper surface of the length direction end of the side wall, the end wall upper wall part is combined with the upper surface of the end wall, along the length direction of the insulating body, at least one end edge of the end wall upper wall part is bent downward to extend to form an end wall shielding part, the end wall shielding part is combined with the outer surface and / or the inner surface of the end wall, the lower edge of the end wall shielding part forms a docking foot part corresponding to the fixation of the docking circuit board.

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