CN113193396A - Electrical connector - Google Patents

Abstract

The invention provides an electric connector, which comprises an insulating body, a plurality of conductive terminals and a metal shell, the insulating body is provided with a base part and a tongue plate, each conductive terminal is provided with a contact part which is exposed out of the surface of the tongue plate, a fixed part which is fixed in the insulating body and a tail part which is positioned at the rear end of the fixed part, the metal shell is provided with a containing space which is opened forwards, the tongue plate is exposed in the containing space, the conductive terminals include a set of first conductive terminals and a set of second conductive terminals, each first conductive terminal has a curved first contact portion exposed on the tongue plate, each second conductive terminal has a straight second contact portion exposed on the tongue plate, in the front-back direction, the second contact part is positioned in front of the first contact part, the tail part extends backwards from the fixed part and is exposed outside the base part, and the tail part is bent to be in elastic contact with an external circuit board in a welding-free mode. The electric connector is convenient to electrically connect.

Description

Electrical connector

This application is a divisional application of the invention patent application entitled "electrical connector" filed on 28/5/2020 and having application number 202010470958.2.

Technical Field

The present invention relates to an electrical connector, and more particularly, to an electrical connector with convenient electrical connection.

Background

A Universal Serial Bus (USB) interface is a standard input/output interface, and is widely used in the design of many electronic devices. When the USB device is not removed after the electronic product is used, the electronic product is prone to being damaged by multi-directional impact force if the electronic product is involved in storage or movement. The traditional USB electric connector comprises an insulating body, a plurality of conductive terminals fixed in the insulating body and a shielding shell which is shielded outside the insulating body, when the traditional USB electric connector is electrically connected with an external circuit board, the traditional USB electric connector is usually welded on the external circuit board through the tail parts of the conductive terminals, so that not only is a complicated welding procedure required, but also risks caused by high temperature in the welding process are avoided, and in addition, in the subsequent use process, the electrical connection between the traditional USB electric connector and the external circuit board is also failed due to the fact that the conductive terminals are abnormally pulled for a long time.

In view of the above, there is a need for an improved electrical connector to solve the above problems.

Disclosure of Invention

The invention aims to provide an electric connector which is convenient to electrically connect.

In order to achieve the above object, the present invention provides an electrical connector, which includes an insulating housing, a plurality of conductive terminals fixed on the insulating housing, and a metal shell, wherein the insulating housing has a base and a tongue plate protruding from the front side of the base, each conductive terminal has a contact portion protruding out of the surface of the tongue plate, a fixed portion fixed in the insulating housing, and a tail portion located at the rear end of the fixed portion, the metal shell has a receiving space opened forward, the tongue plate protrudes out of the receiving space, the conductive terminals include a set of first conductive terminals and a set of second conductive terminals, each first conductive terminal has a first contact portion protruding out of the tongue plate and curved, each second conductive terminal has a second contact portion protruding out of the tongue plate and straight, and the second contact portion is located in front of the first contact portion in the front-back direction, the tail extends backwards from the fixing part and is exposed to the outer side of the base, and the tail is bent to be in elastic contact with an external circuit board in a welding-free mode.

As a further improvement of the present invention, each of the conductive terminals further has a connecting portion connecting the fixing portion and the tail portion, the connecting portions of the first and second conductive terminals are arranged in two rows, and the tail portions of the first and second conductive terminals are arranged in two rows.

As a further improvement of the present invention, each tail portion has an abutting portion formed by arching downward to be in elastic contact with an external circuit board, and in the front-rear direction, the abutting portion of the first conductive terminal is located at the rear side of the abutting portion of the second conductive terminal.

As a further improvement of the present invention, the base portion has a base body portion and a mounting portion formed extending rearward from the base body portion, the mounting portion has a carrier plate formed extending in a lateral direction, and the abutting portion protrudes downward and is exposed to a lower side of the carrier plate.

As a further improvement of the present invention, the carrier plate is provided with a plurality of receiving slots arranged side by side along a transverse direction for receiving corresponding first conductive terminals, each receiving slot is formed by two adjacent partition bars at intervals, the partition bars extend backward beyond the rear end surface of the carrier plate, and the tail portions of the first conductive terminals are located at the rear side of the rear end surface of the carrier plate and extend backward between the two adjacent partition bars.

As a further improvement of the present invention, the base portion has a plurality of fixing grooves arranged along a transverse direction and a limiting groove located at a rear side of the fixing grooves, the first conductive terminal is assembled to the insulating body from top to bottom, and the fixing portion of the first conductive terminal is held in the corresponding fixing groove and the connecting portion of the first conductive terminal is limited in the limiting groove.

As a further improvement of the present invention, in a free state where the abutting portion is not abutted to the external circuit board, the abutting portion of the first conductive terminal is located below the abutting portion of the second conductive terminal in the height direction.

As a further improvement of the present invention, the second conductive terminal is embedded and molded in the insulating body, the carrier plate and the base body are spaced apart in the front-rear direction to form a slot therebetween, and the connection portion of the second conductive terminal is exposed upward through the slot.

As a further improvement of the present invention, the metal case has fitting portions on both sides in a lateral direction thereof for mounting to an external circuit board, fitting faces of the fitting portions being disposed coplanar with a mounting face of the base portion.

As a further improvement of the present invention, the metal shell includes an inner shell and an outer shell, the outer shell includes a main body portion and an extending portion integrally extending rearward from the main body portion, and the main body portion and the inner shell are fixed to cover an upper side of the tongue plate.

The electric connector of the invention elastically contacts with the external circuit board in a welding-free mode through the bent tail part of the conductive terminal, and can avoid the welding process between the conductive terminal and the external circuit board, thereby improving the processing efficiency of the electric connector and avoiding various risks caused by high temperature in the welding process.

Drawings

Fig. 1 is a perspective assembly view of a first embodiment of an electrical connector of the present invention.

Fig. 2 is a view of the electrical connector of fig. 1 from another perspective.

Fig. 3 is an exploded perspective view of the electrical connector shown in fig. 1.

Fig. 4 is a view of the electrical connector of fig. 3 from another perspective.

Fig. 5 is an exploded perspective view of the conductive terminals and the insulative housing of the electrical connector shown in fig. 3.

Fig. 6 is a side view of the electrical connector of fig. 1.

Fig. 7 is a cross-sectional view of the electrical connector shown in fig. 1.

Fig. 8 is a perspective assembly view of a second embodiment of the electrical connector of the present invention.

Fig. 9 is a partially exploded view of the electrical connector shown in fig. 8.

Fig. 10 is a perspective assembly view of a third embodiment of the electrical connector of the present invention.

Fig. 11 is a view of the electrical connector of fig. 10 from another perspective.

Fig. 12 is a perspective view of a stiffener of the electrical connector of fig. 11.

Detailed Description

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

Referring to fig. 1 to 7, an electrical connector 100 according to a first embodiment of the present invention is shown, wherein the electrical connector 100 is configured to be mounted on an external circuit board (not shown), and includes an insulative housing 1, a plurality of conductive terminals 2 retained on the insulative housing 1, and a metal shell.

Referring to fig. 1 to 6, the insulating body 1 has a base 11 and a tongue plate 12 protruding from the front side of the base 11, in this embodiment, the tongue plate 12 is integrally formed by extending forward from the front end surface of the base 11, and in the height direction, the upper surface and the lower surface of the tongue plate 12 are both located between the upper surface and the lower surface of the base 11.

The base 11 has a base portion 112 and a mounting portion 113 extending rearward from the base portion 112, the mounting portion 113 has a carrier 1131 extending in a transverse direction and a pair of extension arms 1132 respectively disposed at two ends of the carrier 1131 in the transverse direction, and the carrier 1131 and the base portion 112 are spaced apart in a front-rear direction to form a slot 1133 therebetween. As shown in fig. 7, the bottom surface of the mounting portion 113 is located above the bottom surface of the tongue plate 12, and further, in a preferred embodiment of the present invention, the bottom surface of the mounting portion 113 is located above the top surface of the tongue plate 12, so as to reduce the occupied space of an external circuit board and save the mounting space.

The bearing plate 1131 is provided with a plurality of accommodating grooves 1134 arranged side by side along the transverse direction, and each accommodating groove 1134 is arranged to be opened upwards and is formed by two adjacent partition rails 1135 at intervals. In this embodiment, the partition 1135 extends rearward beyond the rear surface of the carrier plate 1131 and terminates at the plane of the rear surface of the extension arm 1132.

In addition, the base portion 11 has a pair of positioning protrusions 114 disposed on both sides in the lateral direction thereof, and the pair of positioning protrusions 114 are formed to protrude outward in the lateral direction from both side surfaces of the base portion 112, respectively. Further, in this embodiment, the base 11 further has a pair of slots 115 respectively disposed at two sides in the transverse direction thereof, and the slots 115 are disposed at the intersection of the extension arms 1132 and the base portion 112 at the corresponding sides and are formed by being recessed downward from top to bottom.

The base portion 112 has fixing grooves 1121 arranged in a transverse direction, a stopper wall 1123 located on a front side of the fixing grooves 1121, and a stopper groove 1124 located on a rear side of the fixing grooves 1121. The fixing groove 1121 extends in a height direction, and is opened upward and forward. The stopper walls 1123 partially shield the fixing grooves 1121 at the front sides thereof, and the stopper walls 1123 are intermittently arranged to form openings 1125 communicating with the corresponding fixing grooves 112. The limiting grooves 1124 are recessed on the upper side of the base portion 112 and are disposed corresponding to the fixing grooves 1121 one by one. In this embodiment, the number of the fixing grooves 112 is four. The limiting grooves 1124 are disposed corresponding to the receiving grooves 1134 one by one, and are aligned along the front-rear direction.

Referring to fig. 1 to 7, each of the conductive terminals 2 has a contact portion 21 exposed on the surface of the tongue plate 12, a fixing portion 22 fixed in the insulating body 1, and a tail portion 23 located at the rear end thereof for electrically connecting to an external circuit board.

In the present invention, the tail portion 23 extends backward from the fixing portion 22 in the horizontal direction and is exposed to the outside of the base portion 11, and the tail portion 23 is bent to elastically contact with the external circuit board in a soldering-free manner, so that a soldering process between the conductive terminal 2 and the external circuit board can be eliminated, thereby improving the processing efficiency of the electrical connector 100 and avoiding various risks caused by high temperature during soldering, and also avoiding electrical connection failure between the conductive terminal 2 and the external circuit board during subsequent use.

Specifically, in the present embodiment, the conductive terminals 2 include a group of first conductive terminals 2a and a group of second conductive terminals 2b, each first conductive terminal 2a has a curved first contact portion 21a exposed on the tongue plate 12, each second conductive terminal 2b has a straight second contact portion 21b exposed on the tongue plate 12, and the second contact portion 21b is located in front of the first contact portion 21a in the front-back direction, so that the transmission of high-speed signals is realized through the second group of conductive terminals 2 b. In addition, the number of the first conductive terminals 2a is four, and the number of the second conductive terminals 2b is five.

The tails 23 of the first conductive terminals 2a are located at the rear side of the rear end surface of the carrier plate 1131 and extend backwards between two adjacent partitions 1134, further, each tail 23 has an abutting portion 231 formed by arching downwards to elastically contact with the circuit board, and the abutting portion 231 of the conductive terminals 2 protrudes downwards and is exposed at the lower side of the carrier plate 1131; in the front-rear direction, the abutting portion 231a of the first conductive terminal 2a is located on the rear side of the abutting portion 231b of the second conductive terminal 2 b. In a free state where the abutting portion 231 is not abutted to the external circuit board, the abutting portion 231a of the first conductive terminal 2a is located below the abutting portion 231b of the second conductive terminal 2b in the height direction.

Each conductive terminal 2 further has a connecting portion 24 connecting the top end of the fixing portion 22 and the tail portion 23, the tail portions 23 of the first and second conductive terminals 2a and 2b are arranged in two front and rear rows, the connecting portions 24 of the first and second conductive terminals 2a and 2b are arranged in two upper and lower rows, and the connecting portion 24 of the first conductive terminal 2a extends in the front and rear direction and is limited in the limiting groove 1124 and the accommodating groove 1134 corresponding to the insulating body 1.

The fixing portion 22 of each conductive terminal 2 in the first conductive terminal 2a extends along the vertical direction, the fixing portion 22 of each conductive terminal 2 in the second conductive terminal 2b is L-shaped, and each of the second conductive terminals 2b further has a connecting portion 25 located between the second contact portion 21b and the fixing portion 22 thereof, and the width of the connecting portion 25 in the transverse direction is smaller than that of the fixing portion 22 thereof.

In this embodiment, the first conductive terminal 2a is assembled in the insulating body 1 from top to bottom, and is held in the corresponding fixing groove 1121 of the insulating body 1 by the fixing portion 22, and the connecting portion 24 is limited in the limiting groove 1124. The second conductive terminal 2b is embedded and formed in the insulating body 1, and the tongue plate 12 of the insulating body 1 is provided with a plurality of through holes 121 penetrating through the tongue plate along the height direction, the through holes 121 and the conductive terminals 2 in the second conductive terminal 2b are correspondingly arranged to partially expose the conductive terminals 2, and the connecting portion 24 of the second conductive terminal 2b is exposed upwards through the notch 1133. In addition, in the present embodiment, a row of the through holes 121 is disposed near the front end of the tongue plate 12, and the second contact portions 21b of the second conductive terminals 2b are correspondingly exposed at the through holes 121.

Referring to fig. 1 to 4 in combination with fig. 6 and 7, the metal shell has mounting portions located at both sides in the transverse direction thereof for mounting to an external circuit board, and mounting surfaces 102 of the mounting portions are disposed coplanar with mounting surfaces 110 of the base 11. In the present invention, the assembling portion is at least a pair of wing portions 101, and the metal shell is provided with the wing portions 101 on the outer sides of the base portion 11 and the tongue portion 12.

In addition, the metal shell includes an inner shell 3 and an outer shell 4, the outer shell 4 includes a main body portion 41 and an extending portion 42 integrally extending rearward from the main body portion 41, and the main body portion 41 and the inner shell 3 are fixed and shielded on the upper side of the tongue plate 12.

The inner shell 3 has a receiving space 30 opened forward, and the tongue plate 12 is exposed in the receiving space 30. Specifically, the inner housing 3 has a top wall 31, a bottom wall 32 and a pair of side walls 34 connecting the top wall 31 and the bottom wall 32, and the top wall 31, the bottom wall 32 and the pair of side walls 33 are connected to form the receiving space 30.

The insulating body 1 further has a pair of retaining grooves 1126, the pair of retaining grooves 1126 are concavely disposed at the bottom of the base portion 112, and the rear end of the bottom wall 32 is formed with a first stopping portion 321 bending and extending into the corresponding retaining groove.

The top wall 31 extends rearward so that the rear end surface thereof abuts against the front end surface of the base portion 112, and the tail portions 23 of the conductive terminals 2 are protruded rearward of the rear end surface of the bottom wall 32. In this embodiment, the bottom wall 32 further has a second stopper portion 322 extending rearward beyond the rear end surface of the base portion 112.

Further, each of the side walls 34 has a positioning groove 341 recessed forward from a rear end surface thereof and a first coupling portion 342 located at a front side of the positioning groove 341, and the pair of positioning protrusions 114 of the base portion 11 are inserted forward into the corresponding positioning groove 341. In this embodiment, the first coupling portions 342 are protruding structures protruding from the corresponding side walls 34, and in other embodiments, the first coupling portions 342 can also be recessed structures recessed from the corresponding side walls 34.

Meanwhile, referring to fig. 1 to 7, the electrical connector 100 further includes an outer housing 4 fixed to one side of the inner housing 3 and a reinforcing member 5 fixed to a rear portion of the inner housing 3, the outer housing 4 has at least a pair of wings 101 for being mounted on an external circuit board, and each wing 101 is provided with a mounting hole for being mounted on the external circuit board.

The outer housing 4 includes a main body 41 and an extending portion 42 integrally extending rearward from the main body 41, the main body 41 and the inner housing 3 are fixed and shielded on the upper side of the tongue plate 12, and in a preferred embodiment of the present invention, the main body 41 and the inner housing 3 are welded; in addition, the main body 41 is correspondingly provided with a relief groove 411 for relieving the elastic arm 301. The extending portion 42 covers the upper side of the base portion 11 and has a pair of latching portions 421 located at the bottom thereof to latch on the base portion 11, meanwhile, in the present embodiment, the extending portion 42 further has a pair of insertion tabs 422 bent and extended downward to be inserted into the corresponding insertion slots 115, and the pair of insertion tabs 422 are respectively located at both sides of the extending portion 42 in the transverse direction and located at the front side of the latching portions 421 in the front-rear direction.

The tail portion 23 is located in the shielding range of the outer housing 4 in the front-rear direction, specifically, the tail portion 23 is exposed to the rear side of the inner housing 3 and is exposed downward in the shielding range below the extension portion 42 of the outer housing 4, that is, the tail portion 23 is not exposed outward when viewed from above the electrical connector 100, so that the outer housing 4 can well shield the conductive terminal 2, can absorb external electromagnetic waves, can also suppress electromagnetic waves of itself, and further, can achieve the function of preventing electromagnetic interference.

As shown in fig. 2 to 4 in combination with fig. 6 and 7, in the present embodiment, the stiffener 5 has a back cover plate 51 covering the back side of the inner housing and a pair of side cover plates 52 oppositely disposed at two sides of the back cover plate 51, the pair of side cover plates 52 are respectively fixedly connected to the inner housing 3, and when the electrical connector 100 is subjected to a pressing force in the mating direction, the pressing resistance of the electrical connector 100 when the electrical connector 100 is subjected to the pressing force from the outside is enhanced to not less than 40 kg, that is, when the pressing force applied from the outside is less than or equal to 40 kg, the electrical connector 100 is not affected.

Further, the rear cover 51 has a fitting portion 511 located at a middle portion in a lateral direction thereof and fixed to the insulating body 1, and the fitting portion 511 is formed extending in a same direction as the side cover 52. Specifically, the fitting portion 511 is a sheet-shaped structure formed by bending and extending forward from the plate body portion 510 of the rear cover plate 51, and in the illustrated embodiment of the present invention, the fitting groove 1127 may be a multi-directional open structure that is open downward and rearward; in other embodiments, the fitting groove 1127 may be a one-way opening structure that is opened only backward, and in this case, the fitting portion 511 is inserted forward and is limited in the fitting groove 1127. As shown in fig. 7, the second stopping portion 322 protrudes rearward and has a rear end surface located at the rear side of the front surface of the back plate 51, and in a preferred embodiment, the second stopping portion 322 is located right below the back plate 51 to limit the back plate 51 at the lower side.

When the electrical connector 100 is subjected to an external pushing and pressing force, the inner housing 3 is firstly subjected to the pushing and pressing force, the inner housing 3 can maintain a normal shape to avoid deformation and disintegration by virtue of the support of the reinforcement 5, when the pushing and pressing force is gradually enhanced, the inner housing 3 gradually starts to generate a deformation force of twisting rotation to further drive the reinforcement 5 to start to have the deformation force of twisting rotation, and the second stopping portion 322 is located under the rear cover plate 51, at this time, the second stopping portion 322 can provide stopping and limiting effects for the reinforcement 5, so that the second stopping portion 322 provides a force of reverse deformation for the reinforcement 5, and further enhances the capability of resisting the pushing and pressing force.

Each of the side cover plates 52 has a second coupling portion 521 which is fitted with the corresponding first coupling portion 342 of the inner housing 3. In the present embodiment, the reinforcement 5 is installed to the rear side of the inner housing 3 from the rear to the front, the fitting portion 511 is inserted into the fitting groove 1127 in the front, the side cover plate 52 is coupled to the inner housing 3 by the fitting of the second coupling portion 521 and the first coupling portion 342, and the side cover plate 52 is further coupled to the side wall 34 of the inner housing 3 by welding, but in other embodiments of the present invention, the side cover plate 52 may be fixed to the inner housing 3 by only one of the second coupling portion 521 and the welding.

In the present invention, the inner housing 3 is not provided with a fixing pin for engaging with an external circuit board, but is fixed on the circuit board by the wing 101 of the outer housing 4 (or the outer housing 4 and the stiffener 5), so as to increase the binding force between the electrical connector 100 and the circuit board.

As shown in fig. 2, 4 and 7, in the present invention, an insulating member 6 is disposed inside the extending portion 42 of the outer case 4, and the insulating member 6 completely covers the tail portion 23 from above. In this embodiment, the insulating member 6 is in the form of a sheet and is attached to the inside of the extending portion 42 of the outer housing 4.

As shown in fig. 8 to 9, a second embodiment of the electrical connector 100' of the present invention is disclosed, wherein the basic components and structure of the electrical connector 100' are the same as those of the electrical connector 100 in the first embodiment, and the electrical connector 100' also includes an insulating body 1', at least one set of conductive terminals 2', an inner housing 3', an outer housing 4', and a reinforcing member 5' shielded outside the insulating body 1', and other similar structures are not repeated herein, and are described below only by their differences:

in this embodiment, the basic structure of the stiffener 5' is the same as the stiffener 5 of the first embodiment, except that the stiffener 5' also has at least one pair of wings 101' on both sides in the transverse direction thereof to cooperate with the corresponding wings 101' of the outer housing 4' to mount the electrical connector 100' to an external circuit board, and to make the tolerance of the electrical connector 100' in the mating direction not less than 40 kg. In addition, each sidewall 34 'of the inner housing 3' is bent to form a second stopping portion 343 'that abuts against the insulating body 1'.

As shown in fig. 10 to 12, a third embodiment of the electrical connector 100 ″ of the present invention is provided, the basic composition and structure of the electrical connector 100 ″ are also the same as the electrical connector 100 of the first embodiment, and also include an insulating body 1 ″, at least one set of conductive terminals 2 ″, an inner housing 3 ″, an outer housing 4 ″, and a stiffener 5 ″, which are shielded outside the insulating body 1 ″, other same structures are not repeated herein, and only the differences thereof are explained below:

in this embodiment, similarly to the second embodiment, the stiffener 5 "also has a pair of wings 101" on both sides in the lateral direction thereof to cooperate with the wings 101 "of the outer housing 4" to mount the electrical connector 100 "to an external circuit board, and to make the tolerance of the electrical connector 100" in the mating direction not less than 40 kg.

In addition, the outer case 4 "covers one side of the inner case 3" in the height direction, and the reinforcement 5 "shields the other side of the inner case 3" in the height direction. Specifically, the reinforcement 5 ″ is formed by injection molding of metal powder, and includes a lower cover plate 53 ", a pair of side cover plates 52" located on both sides of the lower cover plate in the transverse direction, and a back cover plate 51 "located on the back side of the lower cover plate 53", the back cover plate 51 "is integrally connected to the lower cover plate 53" and the side cover plates 52 "to cover the four sides of the inner housing 3", and a pair of wings 101 "of the reinforcement 5" are formed by bending and extending from the side cover plates 52 "on the respective sides.

Meanwhile, in the present embodiment, the base 11 "of the insulating main body 1" has a protrusion 116 "protruding downward, and the lower cover plate 53" is provided with a positioning hole 531 "for receiving and limiting the protrusion 116".

The electric connector 100, 100 'of the invention enhances the structural strength of the inner shell 3 by the reinforcing pieces 5, 5' fixed at the rear part of the inner shell 3, 3', thereby improving the anti-pushing capacity of the electric connector 100, 100'; and the mounting on the external circuit board is realized by the outer shell 4, 4 'fixed on one side of the inner shell 3, 3' to make the mounting more firm; in addition, the tail parts 23 of the conductive terminals 2, 2', 2 "of the electric connector 100, 100', 100" are bent to elastically contact with an external circuit board in a welding-free manner, so that a welding process between the conductive terminals 2, 2', 2 "and the external circuit board can be eliminated, the processing efficiency of the electric connector 100, 100', 100" is improved, various risks caused by high temperature in a welding process are avoided, and the electric connection failure between the conductive terminals 2, 2', 2 "and the external circuit board in a subsequent use process can be avoided.

Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the present invention.

Claims (10)

1. An electric connector comprises an insulating body, a plurality of conductive terminals and a metal shell, wherein the conductive terminals are fixedly held on the insulating body, the insulating body is provided with a base part and a tongue plate protruding out of the front side of the base part, each conductive terminal is provided with a contact part protruding out of the surface of the tongue plate, a fixed part fixedly held in the insulating body and a tail part positioned at the rear end of the conductive terminal, the metal shell is provided with a containing space which is opened forwards, the tongue plate protrudes out of the containing space, the conductive terminals comprise a group of first conductive terminals and a group of second conductive terminals, each first conductive terminal is provided with a first contact part which is protruded out of the tongue plate and is bent, each second conductive terminal is provided with a second contact part which is protruded out of the tongue plate and is straight, and the second contact part is positioned in front of the first contact part in the front-back direction, the method is characterized in that: the tail extends backwards from the fixing part and is exposed to the outer side of the base, and the tail is bent to be in elastic contact with an external circuit board in a welding-free mode.

2. The electrical connector of claim 1, wherein: each conductive terminal is also provided with a connecting part which connects the fixing part with the tail part, the connecting parts of the first conductive terminal and the second conductive terminal are arranged into an upper row and a lower row, and the tail parts of the first conductive terminal and the second conductive terminal are arranged into a front row and a rear row.

3. The electrical connector of claim 2, wherein: each tail part is provided with an abutting part which is arched downwards to form elastic contact with an external circuit board, and the abutting part of the first conductive terminal is positioned at the rear side of the abutting part of the second conductive terminal in the front-rear direction.

4. The electrical connector of claim 3, wherein: the base part is provided with a base body part and a mounting part formed by extending backwards from the base body part, the mounting part is provided with a bearing plate formed by extending along the transverse direction, and the abutting part protrudes downwards and is exposed to the lower side of the bearing plate.

5. The electrical connector of claim 4, wherein: the bearing plate is provided with a plurality of accommodating grooves which are arranged side by side along the transverse direction so as to accommodate corresponding first conductive terminals, each accommodating groove is formed by two adjacent partition columns at intervals, the partition columns extend backwards to exceed the rear end face of the bearing plate, and the tail parts of the first conductive terminals are positioned on the rear side of the rear end face of the bearing plate and extend backwards between the two adjacent partition columns.

6. The electrical connector of claim 5, wherein: the base body part is provided with a plurality of fixing grooves arranged along the transverse direction and a limiting groove positioned at the rear side of the fixing grooves, the first conductive terminal is assembled on the insulating body from top to bottom, the fixing part of the first conductive terminal is fixedly held in the corresponding fixing groove, and the connecting part of the first conductive terminal is limited in the limiting groove.

7. The electrical connector of claim 3, wherein: in a free state where the abutting portion is not abutted to the external circuit board, the abutting portion of the first conductive terminal is located on a lower side of the abutting portion of the second conductive terminal in a height direction.

8. The electrical connector of claim 4, wherein: the second conductive terminal is embedded and molded in the insulating body, the bearing plate and the base body part are spaced in the front-back direction to form a notch between the bearing plate and the base body part, and the connecting part of the second conductive terminal is exposed upwards through the notch.

9. The electrical connector of claim 1, wherein: the metal housing has fitting portions on both sides in a lateral direction thereof to be mounted to an external circuit board, fitting surfaces of the fitting portions being disposed coplanar with a mounting surface of the base portion.

10. The electrical connector of claim 9, wherein: the metal shell comprises an inner shell and an outer shell, the outer shell comprises a main body portion and an extending portion, the extending portion integrally extends backwards from the main body portion, and the main body portion and the inner shell are fixed and cover the upper side of the tongue plate.

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