CN112670738A

CN112670738A - USB socket and manufacturing method thereof

Info

Publication number: CN112670738A
Application number: CN202011553270.7A
Authority: CN
Inventors: 唐敏; 杨伟
Original assignee: JUST CONNECTOR KUNSHAN CO Ltd
Current assignee: JUST CONNECTOR KUNSHAN CO Ltd
Priority date: 2020-12-24
Filing date: 2020-12-24
Publication date: 2021-04-16
Also published as: WO2022135541A1

Abstract

The present invention provides a USB socket, comprising a plug connector and a metal shell sleeved outside the plug connector, the plug connector includes a terminal group and an insulating body that holds the terminal group as a whole, the The insulating body includes a base, a wrapping portion extending forward from the base, and a butting tongue portion extending forward from the wrapping portion, and the terminal group at least includes a pair of ground terminals located at the outermost side and a pair of ground terminals located at the outermost side. A power terminal between the ground terminals, the power terminal includes an embedded portion embedded in the insulating body, a solder fillet extending backward from the embedded portion, and a surface extending forward from the embedded portion exposed to the The first contact portion of the vertical first side surface of the butt tongue portion and the surface formed by reverse bending and extending backward from the front end of the first contact portion are exposed to the second side of the vertical second side surface of the butt tongue portion. Contact part; the present application can effectively reduce the manufacturing cost.

Description

USB socket and manufacturing method thereof

Technical Field

The invention relates to the field of electric connectors, in particular to a USB socket and a manufacturing method thereof.

Background

The traditional USB interface needs to be plugged according to a specified direction, for example, a Micro USB interface, a corresponding plug and a corresponding socket need to be butted according to a set butting direction, the structural size is very small, the strength of a plastic structure is insufficient, a user can easily plug the socket direction when plugging, even if a misplug prevention design is provided, but partial users can be forcibly and mistakenly plugged, the socket end in the electronic equipment can still be damaged irreversibly, for example, a butt tongue plate is damaged and is integrally shifted, the butt joint tongue plate can not be plugged into a cavity of the plug to realize butting, even after the tongue plate is damaged due to repeated misplug, the socket terminal on the tongue plate can be broken to completely lose the charging and signal transmission functions. The Type C Type USB socket solves the problem of a traditional Micro USB interface, compatibility of positive and negative insertion is achieved, but a Type C Type connector is suitable for miniaturization of electronic equipment, the size structure is still small, functions needing to be achieved inside the Type C connector are more powerful, up to 24Pin independent terminals are required to be arranged on the upper side and the lower side of the Type C connector, manufacturing difficulty is high, metal middle plates are arranged between the upper row of terminals and the lower row of terminals at intervals, a complex process is required when the Type C Type socket is manufactured, the existing process generally adopts a three-time injection molding process, for example, the metal middle plates and one row of terminal groups are integrally injection molded, the other row of terminal groups are integrally injection molded, and the metal middle plates and the other row of terminal groups are overlapped to form an integral body and are combined into an integral body through injection molding again; finally, in order to cut the material belt at the front end of the terminal group, the end edge part needs to be wrapped by injection molding again. The injection molding process is high in manufacturing cost and difficult to adapt to the market with strong competition. And some electronic devices, such as mobile phones, require more charging capability of the interface, while signal transmission capability is not required.

Disclosure of Invention

Accordingly, there is a need for a USB receptacle and a method for manufacturing the same that can reduce the number of rows of terminals, yet achieve electrical contact on both sides, and that is inexpensive to manufacture.

For solving above-mentioned technical problem, the application provides a USB socket, locate including plug connector and cover the outer metal casing of plug connector, the plug connector includes terminal group and will terminal group fixing insulator as an organic whole, insulator includes the base, certainly the base is preceding to be extended the parcel portion that forms and certainly the preceding butt joint tongue that extends the formation of parcel portion, terminal group is including a pair of power supply terminal at least, the power supply terminal is including the embedding portion in the insulator, certainly the embedding portion is to the soldering lug that extends the formation, certainly the embedding portion is preceding to be exposed in the surface that extends the formation the first contact site of the perpendicular first side of butt joint tongue and certainly the first contact site front end is reverse to bend and extend the surface that forms backward expose in the second contact site of the perpendicular second side of butt joint tongue.

Preferably, the front ends of the first contact portion and the second contact portion are bent in opposite directions to form a bent portion, and a rear end edge of the second contact portion extends into the insulating body to be fixed.

Preferably, the terminal group further includes a pair of ground terminals located at the outermost side, the pair of power terminals are located between the pair of ground terminals, the ground terminals include an embedded portion embedded in the insulating body, a solder tail extending from the rear of the embedded portion to the rear of the base portion, and a first contact portion extending from the embedded portion in the forward direction and exposed to the first side surface of the butt joint tongue portion in the perpendicular direction, and a blade portion covered by the insulating body is provided at a front end edge of the first contact portion.

Preferably, the USB socket further includes a metal reinforcement member electrically contacting the ground terminal and stacked, the metal reinforcement member including a bridging portion electrically contacting a rear surface of the first contact portion of the ground terminal and a second contact portion exposed to the vertical second side surface of the docking tongue portion, the second contact portion of the metal reinforcement member being aligned in a row in a transverse direction with the second contact portion of the power terminal.

Preferably, a butt convex part and a butt concave part located behind the butt convex part are respectively formed on two sides of the butt tongue part, the metal reinforcement further includes an outer convex part and a buckling groove which are formed on a transverse outer side surface and respectively exposed out of the butt convex part and the butt concave part, and the transverse outer side surfaces of the butt convex part and the butt concave part and the transverse outer side surfaces of the outer convex part and the buckling groove are in smooth transition.

Preferably, the metal reinforcing part is a pair of symmetrical arrangements, the metal reinforcing part further comprises a first plate body part and a second plate body part which is formed by folding the first plate body part transversely and inwards and is attached to the first plate body part, and the second contact part of the metal reinforcing part is formed by stamping and protruding the first plate body part towards the first direction.

Preferably, the bridging portion of the metal reinforcing member is formed by stamping and protruding from the second plate body portion in a direction perpendicular to the second direction, and the bridging portion is electrically contacted with the back surface of the first contact portion of the ground terminal inside the insulating body.

Preferably, the metal reinforcing member is made of stainless steel, the first plate body portion and the second plate body portion are formed by stamping, a first groove and a second groove are formed at the positions of the second contact portion and the overlapping portion, and the first groove and the second groove are filled with the plastic material.

Preferably, the second plate portion is provided with a fastening hole through which the thinning portion passes and is fastened and fixed with each other, and the thinning portion passes through the fastening hole from the front end of the first contact portion upwards and then abuts against the front edge of the second plate portion forwards.

In order to solve the above technical problem, the present application further provides a method for manufacturing a USB socket, including the following steps:

the method comprises the following steps that a terminal group fixed on the same material belt is provided, the terminal group at least comprises a pair of power terminals and a pair of grounding terminals located on the outermost side, the pair of power terminals are located between the pair of grounding terminals, each of the power terminals and the grounding terminals comprises an embedding part, a welding leg formed by extending from the embedding part to the back, and a first contact part formed by extending from the embedding part to the front, the power terminals further comprise a second contact part formed by bending the front end of the first contact part in the reverse direction and extending from the front to the back, a thin-beating part is arranged at the front end edge of the first contact part of each grounding terminal, and the material belt of the terminal group is connected with the welding legs of the power terminals and the grounding terminals respectively;

a second step of providing a pair of metal reinforcing parts fixed on another material belt, wherein each metal reinforcing part comprises a first plate body part and a second plate body part which is formed by turning over the transverse inner side of the first plate body part and is attached to the first plate body part, the first plate body part is punched and protruded towards a direction vertical to the first direction to form a second contact part opposite to the first contact part of the grounding terminal, the transverse outer side of the second plate body part is also provided with a connecting part, and the other material belt is respectively connected to the connecting parts on the transverse outer sides of the pair of metal reinforcing parts;

a third step of laminating and fixing the terminal group and the metal reinforcing member, and enabling the surface of the second plate body part to be abutted against the back surface of the first contact part of the grounding terminal;

a fourth step of providing an insulating body, wherein the insulating body comprises a base part, a wrapping part formed by extending the base part forwards and a butt joint tongue part formed by extending the wrapping part forwards, the insulating body, the terminal group and the pair of metal reinforcements are molded into a whole by one-step injection molding, the surfaces of the first contact parts of the power terminal and the grounding terminal are exposed out of the vertical first side surface of the butt joint tongue part, and the surfaces of the second contact parts of the power terminal and the metal reinforcements are exposed out of the vertical second side surface of the butt joint tongue part;

a fifth step of cutting off the connection between the power supply terminal and the grounding terminal and the material belt, and cutting off the connection between the metal reinforcing piece and the other material belt so as to obtain a plug connector;

and a sixth step of providing a metal shell, and sleeving the metal shell outside the plug connector.

According to the butt joint tongue part, the front end of the first contact part of the power supply terminal is bent reversely and extends to form the second contact part exposed on the other side surface of the butt joint tongue part, so that the design of a row of terminals is reduced, one-time injection molding can be realized, and the manufacturing cost is reduced; meanwhile, the metal reinforcing piece is adopted to respectively stamp on two vertical sides to form a lapping part which is in electrical contact with the first contact part of the grounding terminal and a second contact part which is exposed on the other side surface of the butt joint tongue part, and a clamping groove which is clamped and rubbed with the USB plug is arranged on the transverse outer side of the metal reinforcing piece, so that the function of positive and negative insertion is ensured, and the wear resistance of the clamping groove is also ensured.

Drawings

FIG. 1 is a perspective assembly view of a USB socket according to the present invention;

FIG. 2 is an exploded perspective view of the USB socket of the present invention;

FIG. 3 is a perspective view of the plug connector of the USB socket of the present invention;

FIG. 4 is a perspective view of a terminal set of the USB socket of the present invention;

FIG. 5 is a perspective view of a metal reinforcement member of the terminal set of the USB socket of the present invention;

FIG. 6 is a perspective view of another angle of the metal reinforcement of the terminal set of the USB socket of the present invention;

FIG. 7 is a cross-sectional view of the plug shown in FIG. 3 taken along line A-A along the length of the power terminal;

FIG. 8 is a cross-sectional view of the connector of FIG. 3 taken along line B-B and along the length of the ground terminal;

fig. 9 is a cross-sectional view of the plug of another embodiment of the USB receptacle of the present invention taken along the length of the ground terminal.

The meaning of the reference symbols in the drawings is:

a plug-in unit-A; a metal shell-10; a cylinder body-11; a vertical cylinder wall-111; a transverse cylinder wall-112; a cavity-12; a front clamping block-13; a first rear clamping block-14; a second rear clamping block-15; a first weld foot-16; a second weld leg-17; an insulator body-20; a base-21; a front card slot-211; a wrapping portion-22; a docking tongue-23; tail-24; butt joint convex part-25; a docking recess-26; a first rear card slot-241; a second rear card slot-242; a sinking plate avoiding part-243; a terminal group-30; a ground terminal-31; a power supply terminal-32; an embedded portion-311, 321; solder tail-312, 322; a first contact portion-313; 323; a flap-314, 314'; a second contact-324, 333; a bending part-325; a metal reinforcement-33; a first plate portion-331; a second plate portion-332; a lap joint-334; a lateral bulge-335; a snap groove-336; a connecting part-337; a first groove-338; a second groove-339; a buckling hole-4.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Example one

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

Referring to fig. 1 and 2, the USB socket of the present application is a Type C USB socket, and supports forward and reverse plugging. The USB socket comprises a connector A and a metal shell 10 sleeved outside the connector A.

The metal shell 10 comprises a cylinder 11, a cavity 12 enclosed by the cylinder 11, and first and

second welding feet

16 and 17 stamped and formed from the cylinder 11.

The cylinder 11 includes vertical cylinder walls 111 at upper and lower sides and a horizontal cylinder wall 112 connecting the vertical cylinder walls 111 in a horizontal direction. The rear end of the vertical cylinder wall 111 is stamped towards the cavity 12 to form a plurality of front clamping blocks 13, the vertical cylinder wall 111 located at the upper side is bent downwards at the rear end of the front clamping blocks 13 to form a first rear clamping block 14, and the rear end of the transverse cylinder wall 112 is bent inwards to form a second rear clamping block 15. The front side of the transverse cylinder wall 112 is torn and bent to form a first welding leg 16, and the rear end of the transverse cylinder wall 112 is bent downwards to form a second welding leg 17. The first and

second soldering pins

16, 17 are inserted into soldering holes of a printed circuit board (not shown) to solder and fix the USB socket on the printed circuit board.

As shown in fig. 2 to 8, the plug connector a includes a terminal set 30 and an insulating body 20 holding the terminal set 30 together. The insulative housing 20 includes a base 21, a covering 22 extending forward from the base 21, a butt tongue 23 extending forward from the covering 22, and a tail 24 extending rearward from the upper side of the rear end of the base 21. The butt-joint tongue 23 is provided with a butt-joint convex part 25 and a butt-joint concave part 26 positioned behind the butt-joint convex part 25 on the transverse outer side.

The outer diameter of the base 21 is larger than that of the wrapping portion 22, and the outer diameter of the wrapping portion 22 is larger than that of the docking tongue 23. A plurality of front clamping grooves 211 are formed in the front end edge of the base 21, and the front clamping grooves 211 accommodate a plurality of front clamping blocks 13 of the metal shell 10 and limit the plug connector a to move forwards. A first rear clamping groove 241 is formed in the rear end of the tail portion 24, and second rear clamping grooves 242 are formed in the two transverse sides of the tail portion 24. Inserting the plug connector A into the cavity 12, bending and clamping the first and second rear clamping blocks 14 and 15 of the metal shell 10 into the first and second

rear clamping grooves

241 and 242, and limiting the plug connector A to move backwards, matching the front clamping block 13 with the front clamping groove 211 to limit the plug connector A in the plugging direction.

Referring to fig. 3 to 8, the terminal set 30 includes a pair of ground terminals 31 located at the outermost side in the transverse direction, a pair of power terminals 32 located between the pair of ground terminals 31, and a metal reinforcing member 33 disposed on the upper or lower side of the pair of ground terminals 31. The USB socket of the present application only needs to have a charging function, that is, only needs to be provided with the ground terminal 31 and the power supply terminal 32.

The ground terminal 31 and the power terminal 32 each include an embedded

portion

311, 321 embedded in the base portion 21 and the wrapping portion 22 of the insulating housing 20, a

solder leg

312, 322 extending from the embedded

portion

311, 321 to the bottom surface of the tail portion 24, and a

first contact portion

313, 323 extending from the embedded

portion

311, 321 to the front and exposed to one side surface of the mating tongue portion 23.

The USB socket is of a sinking plate type structure, the lower surfaces of the

welding feet

312 and 322 are exposed on the bottom surface of the tail portion 24, a sinking plate avoiding portion 243 is formed below the tail portion and is connected with the printed circuit board in a lap joint mode, namely, one part of the USB socket is sunk into the other side of the printed circuit board, and therefore the thickness of the USB socket on the board on the printed circuit board can be reduced.

The front end edge of the first contact portion 313 of the ground terminal 31 is provided with a thin portion 314, so that the thin portion 314 is wrapped by the front end edge of the butt tongue portion 23 of the insulating body 20 to prevent the front end of the first contact portion 313 from cracking upwards. The metal reinforcement 33 is electrically contacted with the back surface of the first contact portion 313 of the ground terminal 31 to form a second contact portion 333 exposed to the other surface of the mating tongue 23. The metal reinforcing member 33 is made of a stainless steel material, and the metal reinforcing member 33 includes a first plate portion 331, a second plate portion 332 formed by reversely bending the first plate portion 331 from the lateral inner side thereof and stacked on the first plate portion 331, a second contact portion 333 formed by punching the first plate portion 331 from the middle thereof away from the second plate portion 332, a lap portion 334 formed by punching the second plate portion 332 from the middle thereof toward the direction away from the first plate portion 331, and a catching groove 336 formed on the lateral outer side of the second plate portion 332. The second plate body portion 332 has a transverse width larger than that of the first plate body portion 331, and the second contact portions 333 of the first and second

plate body portions

331, 332 at least partially overlap with the overlapping portion 334 in a vertical projection. The first plate body portion 331 is formed with a first groove 338 at a position where the second contact portion 333 is press-formed, and the second plate body portion 332 is formed with a second groove 339 at a position where the overlapping portion 334 is press-formed. The lateral outer side of the first groove 338 is open, and the first groove 338 and the second groove 339 at least partially face each other in the up-down direction. The front end of the second plate body portion 332 on the lateral outer side protrudes outward to form a lateral outer convex portion 335, the fastening groove 336 is formed on the rear side of the outer convex portion 335, and the second plate body portion 332 on the lateral outer side is further provided with a connecting portion 337. The outer convex portion 335 and the locking groove 336 are exposed to the outer side surfaces of the abutting convex portion 25 and the abutting concave portion 26, respectively. The lateral outer side surfaces of the abutting convex part 25 and the abutting concave part 26 and the corresponding lateral outer side surfaces of the outer convex part 335 and the buckling groove 336 are in smooth transition. The pair of metal reinforcing members 33 are connected to one belt by the connecting portion 337. The bridging portion 334 is electrically contacted with the back surface of the contact portion 313 of the ground terminal 31.

The power terminal 32 further includes a second contact portion 324 formed by bending and extending from the front end of the first contact portion 323 in a reverse direction, and a bent portion 335 formed at a bent position of the first contact portion 323 and the second contact portion 324. The surfaces of the

first contact portions

313, 323 of the ground and

power terminals

31, 32 are exposed on a vertical first surface of the docking tongue 23, and the surfaces of the

second contact portions

334, 324 of the

metal reinforcement

33, 32 are exposed on a vertical second surface of the docking tongue 23.

In specific implementation, a fastening groove for fastening with a USB plug (not shown) needs to be disposed on the lateral outer side of the ground terminal 31, the fastening groove needs to be made of a wear-resistant material, the conductive terminal generally needs to be made of a copper material with a low resistance value, and the copper material has poor wear resistance and needs to be made of metal such as stainless steel, so the ground terminal cannot be directly used as the fastening groove. The metal reinforcement 33 is just overlapped and fixed on the ground terminal 31, and the second contact portion 334 and the locking groove 336 are designed to solve the above problem.

During injection molding, the metal reinforcement 33 and the ground terminal 31 are fixed in an up-down overlapping manner, the power terminal 32 (and the signal terminal) and the ground terminal 31 are integrally stamped and connected to the same material belt with the ground terminal 31 to be fixed, and direct injection molding is performed at one time, the ground terminal 31, the power terminal 32 and the metal reinforcement 33 are combined and fixed together by plastic materials, and meanwhile, the rear end of the second contact portion 324 of the power terminal 32 extends and is embedded into the wrapping portion 22 to prevent cracking. The first and

second grooves

338 and 339 of the metal reinforcing member 33 are filled with plastic material to increase the holding force of the plastic material on the metal reinforcing member 33.

Example two

Referring to fig. 9, a cross-sectional view of the ground terminal 31 according to the second embodiment of the present disclosure is shown, in comparison with the first embodiment, the thinned portion 314 'of the ground terminal 31 of the present disclosure is bent toward one side of the metal reinforcing member 33, the second plate portion 332 is provided with a fastening hole 4 at a lateral side, and the thinned portion 314' of the ground terminal 31 passes through the fastening hole 4 and abuts against a surface of the front edge 5 of the second plate portion 332. The fastening hole 4 may be opened from a lateral inner side or an outer side, and the ground terminal 31 is inserted from a lateral opening direction of the fastening hole 4. With this design, the firmness between the metal reinforcing member 33 and the ground terminal 31 can be enhanced and the contact performance can be improved.

The manufacturing method of the USB socket comprises the following steps:

the first step is to provide a terminal group 30 fixed on the same material belt, the terminal group 30 at least comprises a pair of power terminals 32 and a pair of grounding terminals 31 at the outermost side, the pair of power terminals 32 are located between the pair of ground terminals 31, the power terminals 32 include an insertion portion 321, a solder leg 322 extending backward from the insertion portion 321, a first contact portion 323 extending forward from the insertion portion 321, and a second contact portion 324 bent backward from a front end of the first contact portion 323, the ground terminal 31 includes an insertion portion 311, a solder leg 312 extending backward from the insertion portion, and a first contact portion 313 extending forward from the insertion portion 311, a thinning part 314 is arranged at the front end edge of the first contact part 313, and the material belt of the terminal group 30 is respectively connected with the

welding feet

322, 312 of the power terminal 32 and the grounding terminal 31;

a second step of providing a pair of metal reinforcing members 33 fixed to another material belt, wherein each metal reinforcing member 33 comprises a first plate portion 331 and a second plate portion 332 formed by folding from the transverse inner side of the first plate portion 331 and attached to the first plate portion 331, the first plate portion 331 is stamped and protruded towards a direction perpendicular to the first direction to form a second contact portion 333 of the metal reinforcing member 33, a connecting portion 337 is further arranged on the transverse outer side of the second plate portion 332, and the another material belt is respectively connected to the connecting portions 337 on the transverse outer sides of the pair of metal reinforcing members 33;

a third step of laminating and fixing the terminal group 30 and the metal reinforcement 33, and making the upper surface of the second plate portion 332 upwardly abut against the back surface of the first contact portion 313 of the ground terminal 31;

a fourth step of providing an insulative housing 20, wherein the insulative housing 20 includes a base 21, a covering 22 extending forward from the base, and a mating tongue 23 extending forward from the covering, the insulative housing 20, the terminal set 30 and the pair of metal reinforcements 33 are integrally formed by one-step injection molding, a surface of the first contact portion 312 of the power terminal 32 and the ground terminal 31 is exposed outside a vertical first side of the mating tongue 23, and a surface of the

second contact portion

324, 333 of the power terminal 32 and the metal reinforcements 33 is exposed outside a vertical second side of the mating tongue 23;

a fifth step of disconnecting the power terminal 32 and the ground terminal 31 from the tape, and disconnecting the metal reinforcement 33 from another tape to obtain a connector a;

and a sixth step of providing a metal shell 10, and sleeving the metal shell 10 outside the plug connector A.

According to the invention, the front end of the first contact part 323 of the power terminal 32 is bent and extended reversely to form the second contact part 324 exposed on the other side surface of the butt joint tongue part 23, so that the design of a group of conductive terminals is reduced, one-time injection molding can be realized, and the manufacturing cost is reduced; meanwhile, the metal reinforcement 33 is used to punch and form the lapping part 334 electrically contacting with the first contact part 313 of the ground terminal 31 and the second contact part 333 exposed on the other side surface of the butt joint tongue 23, and the metal reinforcement 33 is provided with a clamping groove for clamping and rubbing the USB plug at the transverse outer side, so that the function of positive and negative insertion is ensured, and the wear resistance of the clamping groove 336 is also ensured.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only express preferred embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. The utility model provides a USB socket, includes plug connector and cover and locates the outer metal casing of plug connector, the plug connector includes terminal group and will terminal group holding insulator as an organic whole, insulator includes the base, certainly the base is preceding to be extended the parcel portion that forms and certainly the preceding butt joint tongue that extends the formation of parcel portion, a serial communication port, terminal group is including a pair of power supply terminal at least, the power supply terminal is including the embedding portion in the insulator, certainly the embedding portion is backward extended the soldering lug that forms, certainly the embedding portion is preceding to be extended the surface exposure that forms the first contact site of the perpendicular first side of butt joint tongue and certainly the first contact site front end is reverse to be bent and is extended the surface exposure that forms backward the second contact site of the perpendicular second side of butt joint tongue.

2. The USB socket according to claim 1, wherein the first contact portion and the second contact portion are bent in opposite directions to form a bent portion, and a rear edge of the second contact portion extends into the insulating body to be fixed.

3. The USB socket according to claim 1, wherein the terminal set further includes a pair of ground terminals located at the outermost side, the pair of power terminals are located between the pair of ground terminals, the ground terminals include an insertion portion inserted into the insulating body, a solder tail extending from a rear end of the base portion rearward of the insertion portion, and a first contact portion extending from the insertion portion forward and exposed to the vertical first side surface of the mating tongue portion, and a thin-tapped portion covered by the insulating body is provided at a front end edge of the first contact portion.

4. The USB socket according to claim 3, further comprising a metal reinforcing member in electrical contact with the ground terminal and stacked, the metal reinforcing member including a bridging portion in electrical contact with a rear surface of the first contact portion of the ground terminal and a second contact portion exposed to the vertical second side surface of the docking tongue, the second contact portion of the metal reinforcing member being aligned in a transverse direction with the second contact portion of the power terminal.

5. The USB socket according to claim 4, wherein the docking tongue has a docking protrusion and a docking recess behind the docking protrusion formed on both sides thereof, the metal reinforcement further includes an outer protrusion and a locking groove formed on a lateral outer surface thereof and exposed to the docking protrusion and the docking recess, respectively, and the lateral outer surfaces of the docking protrusion and the docking recess are in smooth transition with the lateral outer surfaces of the outer protrusion and the locking groove.

6. The USB socket according to claim 5, wherein the metal reinforcing member is a symmetrical pair, and the metal reinforcing member further includes a first plate portion and a second plate portion folded from the lateral inner side of the first plate portion and attached to the first plate portion, and the second contact portion of the metal reinforcing member is formed by stamping and protruding from the first plate portion in a direction perpendicular to the first direction.

7. The USB socket according to claim 6, wherein the bridging portion of the metal reinforcing member is formed by punching and protruding from the second plate portion in a direction perpendicular to the second direction, and electrically contacts with the back surface of the first contact portion of the ground terminal inside the insulating body.

8. The USB socket according to claim 7, wherein the metal reinforcing member is made of stainless steel, and the first plate portion and the second plate portion are stamped to form first and second grooves at the positions of the second contact portion and the overlapping portion, and the first and second grooves are filled with the plastic material.

9. The USB socket according to claim 6, wherein the second plate portion defines a fastening hole for the thin-plate portion to pass through and fasten with each other, and the thin-plate portion passes through the fastening hole from the front end of the first contact portion and then abuts against the front edge of the second plate portion.

10. A manufacturing method of a USB socket is characterized by comprising the following steps:

a fifth step of cutting off the connection between the power supply terminal and the grounding terminal and the material belt, and cutting off the connection between the metal reinforcing piece and the other material belt, thereby obtaining a plug connector;