CN211579025U - Board-to-board plug - Google Patents

Abstract

A board-to-board plug comprises a plurality of plug terminals, a plug body for integrally fixing the plug terminals, a cable assembly arranged behind the plug body and connected with the plug terminals, and a shielding shell covering the plug body, the plug body comprises a base part and an extension part formed by extending from the base part, the top of the extension part is recessed downwards at the rear end to form a welding table, the plug terminal comprises a signal terminal and a grounding terminal which are arranged at intervals, the signal terminal and the grounding terminal both comprise welding feet extending to the welding table, the welding table is provided with a welding groove corresponding to the welding foot, the welding groove comprises a first welding groove and a second welding groove which are arranged in a staggered manner in the front-back direction, and the welding leg of the signal terminal is welded in the first welding groove to form a welding pad, and the welding leg of the grounding terminal is welded in the second welding groove to form a welding pad. The welding leg of the plug terminal can realize larger welding pads to enhance the welding bonding force.

Description

Board-to-board plug

Technical Field

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

Background

Because the traditional single-channel coaxial connector can not meet the communication requirements of consumer electronic equipment such as smart phones, a multi-channel high-frequency transmission connector in a plate-to-plate form appears. CN110474201A discloses a board-to-board plug, which includes a plug body formed with a plurality of conductive terminals, a cable assembled at the tail of the plug body and welded with the conductive terminals, and a shielding shell covering the plug body. Conductive terminal including extend to behind the plug body with the heart yearn welded weld part of cable, conductive terminal include the ground terminal and the signal terminal that the interval set up, ground terminal and signal terminal are one row of range in the transverse direction, and the welding position space is less, produces easily that soldering tin climbs the tin and leads to short circuit or the too little technical problem that can't stabilize the welding of pad.

Meanwhile, the covering part which covers and holds the upper parts of the cable supports of the cables is bent downwards at two transverse sides of the shielding shell, the extending arm part formed by extending the plug body backwards and a part of the cable supports support the covering part, the supporting force for the covering part is limited, and the covering part is easily bent excessively and collapsed during bending.

And, the plug body with shielding case's location sets up spacing bulge through plug body front end shielding case front end sets up spacing breach, during the equipment, the plug body pushes forward and makes spacing bulge card is gone into in the spacing breach location, the accurate positioning of other parts needs follow-up cladding and the spot welding through the covering portion to fix a position, causes the relative position of plug body and shielding case to change and finally influences the product precision during this period easily.

SUMMERY OF THE UTILITY MODEL

In view of this, it is necessary to provide a board-to-board plug, which increases the bonding pad by arranging the solder tails of the signal terminal and the ground terminal in a staggered manner, and ensures a better soldering bonding force.

In order to solve the above technical problem, the present application provides a board-to-board plug, which comprises a plurality of plug terminals, a plug body for integrally fixing the plug terminals, a cable assembly located behind the plug body and connected to the plug terminals, and a shielding shell covering the plug body, the plug body comprises a base part and an extension part formed by extending from the base part, the top of the extension part is recessed downwards at the rear end to form a welding table, the plug terminal comprises a signal terminal and a grounding terminal which are arranged at intervals, the signal terminal and the grounding terminal both comprise welding feet extending to the welding table, the welding table is provided with a welding groove corresponding to the welding foot, the welding groove comprises a first welding groove and a second welding groove which are arranged in a staggered manner in the front-back direction, and the welding leg of the signal terminal is welded in the first welding groove to form a welding pad, and the welding leg of the grounding terminal is welded in the second welding groove to form a welding pad.

Preferably, a covering portion covering the ground terminal solder leg is formed in the transverse direction of the first solder groove, a backward extending portion is formed by continuing backward extending of the first solder groove, a partition plate is formed between the backward extending portion and the second solder groove, the signal terminal solder leg is located in the first solder groove, the width of the signal terminal solder leg is greater than that of the signal terminal, and the width of the ground terminal solder leg is greater than that of the ground terminal.

Preferably, the cable assembly includes a plurality of coaxial cables and a cable holder for integrally holding the plurality of coaxial cables, and the coaxial cables include center conductors extending into the first solder grooves through the rear extensions and soldered to the signal terminal pins.

Preferably, the coaxial cable further includes an inner insulating layer coated outside the center conductor, a braid coated outside the inner insulating layer, and an outer insulating layer coated outside the braid, the braid is combined with the cable holder, the cable holder includes a welding rod and a clamping bar for clamping the braid therein, and a soldering tin or a conductive adhesive for filling between the welding rod and the clamping bar, and the soldering tin or the conductive adhesive holds the braid, the welding rod, and the clamping bar as a whole.

Preferably, the welding rod extends towards the second welding groove direction to form a welding arm, and the welding arm comprises a bending part formed by bending in the vertical direction and a welding end part which extends forwards from the bending part to the second welding groove and is welded with the grounding terminal leg.

Preferably, the welding end is located on the same horizontal plane as the welding surface of the central conductor.

Preferably, the plug body further includes an island portion formed by protruding downward from the base portion, a pair of extension arms formed by extending rearward from two lateral sides of a rear end of the extension portion, and an avoiding portion located between the pair of extension arms, the front end of the cable support abuts against the rear ends of the pair of extension arms, and an inner insulating layer portion of the coaxial cable is located in the avoiding portion.

Preferably, the plug terminal further includes a U-shaped contact portion formed outside the island portion and a holding portion formed by extending rearward from the U-shaped contact portion, the solder tail is formed by extending rearward from the holding portion, and the U-shaped contact portion includes a first contact arm formed on a front end surface of the island portion, a second contact arm formed on a rear end surface of the island portion, and a connecting portion connecting the first and second contact arms and formed on a bottom surface of the island portion.

Preferably, the shielding shell includes a top cover plate covering the top surface of the base, a front cover wall formed by bending the front end of the top cover plate downward, side cover walls formed by bending the two lateral ends of the front cover wall rearward, and a protection portion located outside the side cover walls formed by bending the two lateral sides of the base downward, the bottom end of the protection portion is bent relatively to form a tightening portion covering the bottom surface of the extension portion and a part of the cable assembly, and the rear end of the protection portion is bent inward and reversely to form a support portion supported between the tightening portion and the top cover plate.

Preferably, the covering side wall includes a first covering side wall located laterally outside the base portion, an inward folded portion formed by inward folding of a rear end of the first covering side wall, and a second covering side wall located laterally outside the extending portion and formed by extending of a rear end of the inward folded portion, the supporting portion is bent in a reverse direction and extends to an inner side of an end portion of the second covering side wall, and the cable support is located between the extending arm and the supporting portion.

This application is through inciting somebody to action signal terminal is in with ground terminal's leg around on the welding stage of plug body dislocation set up first, second weld the groove to widen in the transverse direction first, second weld the area in groove, the leg that has solved prior art plug terminal is located same transverse direction and the weld groove width undersize that causes, and the pad cohesion is not enough, and welds the too high technical problem of required precision.

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. In the drawings:

FIG. 1 is a perspective view of a board-to-board plug of the present application;

FIG. 2 is a perspective view of another angle of the plate-to-plate plug of the present application;

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 1;

fig. 4 is a combination view of the plug body, plug terminals and metal reinforcement of the board-to-board plug of the present application;

fig. 5 is a combination view of the plug body, plug terminals and metal reinforcement member of the board-to-board plug of the present application at another angle;

fig. 6 is a perspective view of the plug terminal of the plate-to-plate plug of the present application;

FIG. 7 is a perspective view of a metal reinforcement member of the plate-to-plate plug of the present application;

fig. 8 is a perspective view of the shield housing of the board-to-board plug of the present application;

FIG. 9 is a perspective view of the plate-to-plate plug of the present application with the shield shell removed;

FIG. 10 is a perspective view of the cable assembly of the plate-to-plate plug of the present application;

figure 11 is a perspective view of the shield housing of the board-to-board plug of the present application during assembly;

fig. 12 is a combination diagram of the board-to-board plug of the present application, before the plug body is injection molded, the plug terminal and the metal reinforcement are connected with the material strap.

Description of the main component symbols:

a shielding shell-10; a cover top plate-11; covering the front wall-12; a limiting hole-121; covering the side wall-13; a first cover sidewall-131; an inner fold-132; a second cover sidewall-133; a protection portion-14; a first protection portion-141; a second protection portion-142; a support portion-143; a tightening part-144; a plug body-20; a base-21; a top wall-211; a limiting convex part-212; an island portion-22; an island body-221; a reinforced end-portion-222; an extension-23; a projection-231; an interior recess-232; a welding table-233; a first solder well-2331; a second solder well-2332; cover-2333; baffle-2334; postero-2335; an extension arm-24; an escape portion-25; a plug terminal-30; a U-shaped contact portion-31; a first contact arm-311; a second contact arm-312; a connecting portion-313; a holding portion-32; a fillet-33; signal terminal solder tail-331; ground terminal fillet-332; a metal reinforcement-40; a main body portion-41; a first reinforcing wall-42; a second reinforcing wall-43; a third reinforcing wall-44; cable assembly-50; a coaxial cable-51; a center conductor-511; an inner insulating layer-512; a braid-513; an outer insulating layer-514; a cable holder-52; solder pad-521; solder or conductive paste-522; a clamping bar-523; a welding arm-524; a bent portion-5241; end-5242 is welded.

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. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments.

In the present application, the X direction shown in fig. 1 is the front in the left-right direction (lateral direction), the Y direction is the front in the front-rear direction (longitudinal direction), and the Z direction is the upper side in the up-down direction (vertical direction).

Referring to fig. 1 and 2, the plate-to-plate plug of the present application includes a plug body 20, a plurality of plug terminals 30 and metal reinforcements 40 integrally formed in the plug body 20, a cable assembly 50 connected to the plug terminals 30, and a shielding shell 10 covering the plug body 20.

Referring to fig. 4 and 5, the plug body 20 includes a base 21, an island 22 formed by protruding downward from the middle of the base 21, an extension 23 formed by extending rearward from the base 21, extension arms 24 formed by extending rearward from two lateral sides of the extension 23, and a relief portion 25 formed between a pair of the extension arms 24. The base 21 includes a top wall 211 and a limiting protrusion 212 formed by protruding forward from the top wall 211, and a positioning hole 213 is formed on the top surface of the top wall 211 corresponding to the island 22. The island portion 22 includes an island portion main body 221 and reinforcing end portions 222 formed at both lateral ends of the island portion main body 22. The island 22 is formed to protrude downward from the top plate 211.

The extension portion 23 includes a protrusion 231 protruding downward, inner recesses 232 formed at both lateral sides of the extension portion 23, and a land 233 recessed downward from a top surface of the extension portion 23. The soldering land 233 includes a plurality of soldering recesses corresponding to the plug terminals 30, and the soldering recesses include a first soldering recess 2331 and a second soldering recess 2332 formed in a staggered manner in a front-rear direction. The lower surface of the protrusion 231 is lower than the lower surface of the extension arm 24 to form a limit step 241 on the rear end surface of the protrusion 231.

As shown in fig. 6, the plug terminal 30 includes a U-shaped contact portion 31 integrally formed outside the island portion 22, a holding portion 32 extending rearward from the U-shaped contact portion 31, and a solder tail 33 formed at a rear end of the holding portion 32.

The U-shaped contact portion 31 includes a first contact arm 311 attached to the front end surface of the island 22, a second contact arm 312 attached to the rear end surface of the island 22, and a connecting portion 313 crossing the bottom surface of the island 22 and connecting the first and second contact arms 311, 312. The holding portion 32 is integrally formed in the top wall 211 of the base portion 21 and extends rearward into the extending portion 23, a positioning hole 213 formed in the top wall 211 passes through a space between the first and second contact arms 311, 312 of the U-shaped contact portion 31, so that when the plug body 20 is injection molded, an injection mold needle can conveniently clamp the connecting portion 313 from above through the positioning hole 213 to position the plug terminal 30. The solder leg 33 is formed by bending downward from the connecting portion 32 and then bending and extending backward, so that a relatively thick plastic layer (i.e., a solder stage 233) is provided between the solder leg 33 and the shield case 10.

The plug terminal 30 includes a signal terminal 30a and a ground terminal 30b spaced apart from each other, the solder leg 33 of the signal terminal 30a has a signal terminal solder leg 331 located in the first solder recess 2331, and the solder leg of the ground terminal 30b has a ground terminal solder leg 332 located in the second solder recess 2332. The first solder pot 2331 is positioned at the front end of the second solder pot 2332 to be offset in the front-rear direction, a cover 2333 covering the ground terminal 30b is formed between the first solder pot 2331, and a spacer 2334 is formed between the second solder pot 2332 and the rear extension 2335 of the first solder pot 2331. The signal terminal solder leg 331 and the ground terminal solder leg 332 have upper surfaces on the same plane in the vertical direction.

As shown in fig. 7, the metal reinforcing member 40 includes a main body 41 formed on the top wall 211, a first reinforcing wall 42 bent downward from the main body 41 and overmolded on the lateral outer side surface of the reinforcing end 222 of the island 22, a second reinforcing wall 43 bent inward from the bottom of the first reinforcing wall 42 and covering the bottom surface of the reinforcing end 222, and a pair of third reinforcing walls 44 bent upward from the front and rear sides of the second reinforcing wall 43 and covering the front and rear end surfaces of the reinforcing end 222. The upper surface of the main body portion 41 is exposed to the top surface of the top wall 211.

Referring to fig. 3, 9 and 10, the cable assembly 50 includes a plurality of coaxial cables 51 and a cable holder 52 for integrally combining the coaxial cables 51. The coaxial cable 51 includes a central conductor 511 welded to the fillet 33 of the signal terminal 30a, an inner insulating layer 512 covering the central conductor 511, a braid 513 covering the inner insulating layer 512, and an outer insulating layer 514 covering the braid 513. The cable holder 52 comprises a soldering lug 521, a clamping bar 523 for clamping the braided layers 513 of the coaxial cables 51 with the soldering lug 521, and soldering tin or conductive adhesive 522 for fixing the braided layers 513 of the coaxial cables 51 between the soldering lug 521 and the welding bar 523, wherein the soldering tin or conductive adhesive 522 is used for bonding and fixing the braided layers 513 of the coaxial cables 51 together and is integrally fixed with the soldering lug 521 and the clamping bar 523. The soldering lug 521 includes a soldering arm 524 extending forward after being bent, and the soldering arm 524 includes a bent portion 2541 extending in the vertical direction and a soldering end 5242 extending forward from the bent portion. The soldering end 5242 is at the same level as the central conductor 511.

The cable assembly 50 is assembled to the soldering stage 233 of the plug body 20 from top to bottom, the inner insulating layers 512 of the plurality of coaxial cables 51 are clamped into the escape portion 25 between the pair of extension arms 24, the cable holder 52 is located behind the pair of extension arms 24, and the central conductor 511 is soldered to the signal terminal leg 331 of the signal terminal 30a extending into the first soldering bath 2331 over the rear extension portion 2335 in the forward direction. The soldering end portion 5242 of the soldering lug 521 extends to the upper side of the ground terminal leg 332 of the ground terminal 30b in the second soldering channel 2332 and is soldered and fixed.

The first solder pot 2331 and the second solder pot 2332 are staggered in the front-rear direction, so that the area of the first solder pot 2331 and the second solder pot 2332 can be enlarged in the transverse direction, the tin-containing capacity of the first solder pot 2331 and the second solder pot 2332 is increased, the bonding force of a bonding pad is enhanced, and the risks that the width of the bonding pad is too small, the requirement on welding precision is high and short circuit is easily caused because the welding feet 33 of the signal terminal 30a and the grounding terminal 30b are positioned at the same position in the front-rear direction in the prior art are solved. The upper surface of the soldering station 23 is lower than the upper surface of the top wall 211, and the surfaces of the first and second soldering recesses 2331, 2332 are lower than the upper surface of the extension arm 24. The soldered upper end of the center conductor 511 is lower than the upper surface of the cable holder 52.

This application is through with the leg 33 of signal terminal 30a and ground terminal 30b is in dislocation set is first, second weld tank 2331, 2332 around on the welding stage 23 of plug body 20 to widen in the transverse direction first, second weld tank 2331, 2332's area, solved the technical problem that the leg 33 of prior art plug terminal 30 is located same transverse direction and the weld tank width that causes is too little, and the welding precision requires too high.

As shown in fig. 12, when the plug body 20 is injection molded, the front end and the rear end of the plug terminal 30 are respectively connected to the first terminal material strip 30c and the second terminal material strip 30d, the transverse outer side of the metal reinforcement 40 is connected to the reinforcement material strip 40a, the left metal reinforcement 40 and the right metal reinforcement 40 are connected by the same reinforcement 40a, and the reinforcement material strip 40a and the first or the second terminal material strip 30c and 30d are positioned in an overlapping manner. Meanwhile, the positioning pin of the injection mold vertically clamps the connection portion 313 of the plug terminal 30 through the positioning hole 213 for positioning. After injection molding, the second terminal tape 30d connected to the rear end of the solder fillet 33 and the reinforcement tape 40a connected to the metal reinforcement 40 are cut off, and the first terminal tape 30c connected to the front of the plug terminal 30 is left. The first terminal strip 30c is left to be cut after the cable assembly 50 is automatically assembled.

As shown in fig. 8 and 11, the shielding shell 10 includes a top cover plate 11 covering the top wall 211 of the plug body 20 and the upper surface of the cable support 52, a front cover wall 12 formed by bending the front end of the top cover plate 11 downward, a side cover wall 13 formed by bending and extending the two lateral ends of the front cover wall 12 backward, and a protection portion 14 formed by bending the two lateral sides of the top cover plate 11 downward and surrounding the side cover wall 13. A limiting hole 121 is formed in the front-back direction at the joint of the covering front wall 12 and the covering top plate 11, and the limiting hole 121 is used for inserting and limiting a limiting convex part 212 of the plug body 20.

The covering sidewall 13 includes a first covering sidewall 131 located on the lateral outer side of the base 21, an inward folded portion 132 formed by oppositely folding the rear end of the first covering sidewall 131 and located on the lateral two sides of the extending portion 23, and a second covering sidewall 133 formed by extending the rear end of the inward folded portion 132 backward and clamped between the extending arm 23 and the lateral outer side of the cable holder 52. The protection part 14 includes a first protection part 141 located outside the first covering sidewall 131 and the inward folding part 132, a second protection part 142 extending from the back of the first protection part 141 and located outside the second covering sidewall 133, a support part 143 bent reversely from the tail of the second protection part 142 and extending to the inner side of the second covering sidewall 133, and a tightening part 144 bent from the bottom of the second protection part 142 to the cable bracket 52 and covering the lower surface of the cable bracket 52. The gripping portion 144 is supported below a pair of the extension arms 24.

Simultaneously, the part 144 of cramping still receives supporting part 143 is the ascending support in upper and lower direction, avoids cramping part 144 only to support in on the extension arm 24 of plastic material, and the holding power is not enough and lead to yielding defect, and directly certainly the inside reverse bending of protection part 14 rear end forms supporting part 143 can not cause the product size grow, the advantage of saving space.

The shielding shell 10 of the present application is directly in the rear end of the protection portion 14 is bent inward to form the supporting portion 143 located inside the second covering sidewall 133 to support the tightening portion 144 formed by bending the bottom of the second protection portion 142, so as to avoid the problem that the existing tightening portion 144 is only supported by the extension arm 24 made of plastic material to cause bending deformation, and the overall dimension of the product is not changed, thereby saving space.

The application of board to board plug will according to aforementioned mode when the equipment cable subassembly 50 assembly weld in back on the welding stage 23 of plug body 20 rear end, will plug body 20 is packed into from upwards down the cover roof 11 and the cover lateral wall 13 of shielded cell 10 in the space that encloses, will again plug body 20 promotes forward and makes the spacing convex part 212 card of plug body 20 front end is gone into it is spacing in the spacing hole 121 of covering antetheca 12, spacing convex part 212 with spacing can be controlled to spacing hole 121 and prevent that plug body 20 from rocking, stops simultaneously plug body 20 removes forward spacingly. Then, the tightening portion 144 is bent to make the tightening portion 144 abut against the limiting step 241 at the rear end edge of the protruding portion 231 to prevent the plug body 20 from withdrawing backwards.

The upper surface of the main body portion 41 of the metal reinforcing member 40 is in contact with the cover top plate 11, and the metal reinforcing member 40 and the cover top plate 11 may be welded and fixed together by spot welding on the cover top plate 11 to reinforce the coupling force between the plug body 20 and the shield shell 10. The welding of the metal reinforcing member 40 to the shield shell 10 is not necessary, and can be achieved by the limiting step 241 of the header body 20 being limited by the limiting projection 212 cooperating with the tightening part 144.

The board-to-board plug of the present application forms a limiting protrusion 212 that is inserted into the limiting hole 121 of the shielding shell 10 by extending at the front end of the plug body 20, so as to prevent the plug body 20 from shaking left and right and prevent the plug body 20 from moving forward; meanwhile, a limiting step 241 for limiting the position of the protrusion 231 of the extension portion 23 of the plug body 20 by abutting against the tightening portion 144 is formed on the bottom surface of the protrusion 231 of the extension portion 23 to prevent the plug body 20 from moving backwards and stopping, so that the plug body 20 is limited.

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 (10)

1. A board-to-board plug comprises a plurality of plug terminals, a plug body for integrally fixing the plug terminals, a cable assembly arranged behind the plug body and connected with the plug terminals, and a shielding shell covering the plug body, the plug body comprises a base part and an extension part formed by extending from the base part, the top of the extension part is recessed downwards at the rear end to form a welding table, the plug terminal comprises a signal terminal and a grounding terminal which are arranged at intervals, the signal terminal and the grounding terminal respectively comprise welding feet extending to the welding table, welding grooves corresponding to the welding feet are formed on the welding table, it is characterized in that the welding grooves comprise a first welding groove and a second welding groove which are arranged in a staggered manner in the front-back direction, and the welding leg of the signal terminal is welded in the first welding groove to form a welding pad, and the welding leg of the grounding terminal is welded in the second welding groove to form a welding pad.

2. The board-to-board plug of claim 1, wherein the first solder recess is formed with a covering portion in a transverse direction thereof for covering the solder leg of the ground terminal, the first solder recess is further formed with a backward extending portion in a backward extending manner, a partition is formed between the backward extending portion and the second solder recess, a width of the signal terminal solder leg in the first solder recess is larger than a width of the signal terminal, and a width of the ground terminal solder leg in the second solder recess is larger than a width of the ground terminal.

3. The board-to-board plug of claim 2, wherein the cable assembly includes a plurality of coaxial cables and a cable bracket holding the plurality of coaxial cables together, the coaxial cables including center conductors extending through the rear extensions into the first solder slots and soldered to the signal terminal solder tails.

4. The board-to-board plug of claim 3, wherein said coaxial cable further comprises an inner insulating layer coated over said center conductor, a braid coated over said inner insulating layer, and an outer insulating layer coated over said braid, said braid being bonded to said cable holder, said cable holder including a welding rod, a clamping bar, and a solder or conductive paste filling between said welding rod and clamping bar, said solder or conductive paste holding said braid, welding rod, and clamping bar together.

5. The board-to-board plug according to claim 4, wherein said solder wire extends in a direction toward said second solder pot to form a solder arm, said solder arm including a bent portion bent in a vertical direction and a solder end portion extending forward from said bent portion to be soldered to said solder leg of said ground terminal in said second solder pot.

6. The board-to-board plug of claim 5, wherein said solder end is level with a solder face of said center conductor.

7. The board-to-board plug of claim 5, wherein the plug body further includes an island portion formed to project downward from the base portion, a pair of extension arms formed to extend rearward from both lateral sides of a rear end of the extension portion, and a relief portion located between the pair of extension arms, the front end of the cable support abuts against the rear ends of the pair of extension arms, and the inner insulating layer portion of the coaxial cable is located in the relief portion.

8. The board-to-board plug of claim 7, wherein said plug terminal further comprises a U-shaped contact portion formed outside said island portion and a retention portion formed to extend rearwardly from said U-shaped contact portion, said solder tail is formed to extend rearwardly from said retention portion, and said U-shaped contact portion comprises a first contact arm formed on a front face of said island portion, a second contact arm formed on a rear face of said island portion, and a connecting portion connecting said first and second contact arms and formed on a bottom face of said island portion.

9. The board-to-board plug of claim 1, wherein the shield shell includes a top cover plate covering the top surface of the base, a front cover wall formed by bending downward from the front end of the top cover plate, side cover walls formed by bending backward from both lateral ends of the front cover wall, and a protection portion outside the side cover walls formed by bending downward from both lateral sides of the base, wherein the bottom end of the protection portion is bent inward and reversely to form a tightening portion covering the bottom surface of the extension portion and a part of the cable assembly, and the rear end of the protection portion is bent inward and reversely to form a support portion supported between the tightening portion and the top cover plate.

10. The board-to-board plug of claim 9, wherein the cover sidewall includes a first cover sidewall laterally outward of the base portion, an inflected portion formed by being inwardly inflected from a rear end of the first cover sidewall, and a second cover sidewall laterally outward of the extended portion formed by being extended from a rear end of the inflected portion, the support portion being reversely inflected and extended inward of an end portion of the second cover sidewall, and a cable bracket being located between the extension arm and the support portion.

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