CN212257789U - Electrical connector - Google Patents

Abstract

The utility model provides an electric connector, it includes insulator, fixing in insulator's at least a set of conductive terminal and shield the casing, insulator has the basal portion and outstanding in the hyoplastron of basal portion front side, every conductive terminal have suddenly expose in the contact site on hyoplastron surface, the fixed part of fixing in insulator and lie in the afterbody on its rear end with electric connection to external circuit board, shield the casing and have the accommodation space of forward open setting, the hyoplastron suddenly expose in the accommodation space, electric connector is still including being fixed in shield the reinforcement at casing rear portion. The utility model discloses electric connector has the resistant ability of bulldozing of preferred.

Description

Electrical connector

Technical Field

The utility model relates to an electric connector especially relates to an electric connector of resistant ability preferred that bulldozes.

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. However, when the conventional USB electrical connector is subjected to multi-directional impact, the shielding housing is easily deformed or disintegrated, and under the action of a large external force, the shielding housing and the insulating body are deformed together to cause connection failure between the conductive terminals and the circuit board.

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

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an electric connector that resistant bulldozes ability preferred.

In order to achieve the above object, the present invention provides an electrical connector, which comprises an insulator, a fixed terminal and a shielding shell, wherein the insulator has a base and a tongue plate protruding from the front side of the base, the conductive terminal has a contact portion protruding from the surface of the tongue plate, a fixed portion fixed in the insulator and a tail portion located at the rear end of the fixed portion and electrically connected to an external circuit board, the shielding shell has an accommodating space opened forward, the tongue plate protrudes from the accommodating space, and the electrical connector further comprises a reinforcing member fixed at the rear portion of the shielding shell.

As a further improvement of the present invention, the electrical connector further has a fixing housing fixed to one side of the shielding housing, the fixing housing has at least one pair of wing portions for being mounted on an external circuit board, the fixing housing includes a main body portion and an extension portion integrally formed by extending rearward from the main body portion, the main body portion and the shielding housing are fixed and covered on the upper side of the tongue plate, the extension portion is covered on the upper side of the base portion.

As a further improvement of the utility model, it has roof, diapire and general to shield the casing a pair of lateral wall that roof and diapire link to each other, insulator still has a pair of card and holds the groove, the rear end of diapire is formed with the first backstop portion that the corresponding card of extending into was held the inslot of buckling.

As a further improvement of the utility model, the extension have be located its bottom in order to grab the knot in a pair of knot of basal portion holds the portion, the roof is provided with a pair of elastic arm, correspond on the main part and seted up and dodge the groove of stepping down of elastic arm.

As a further improvement of the present invention, the reinforcement has a cover in the rear housing plate of the rear housing plate and a pair of side cover plates disposed on both sides of the rear housing plate, the pair of side cover plates respectively and fixedly connect to the housing, and the pushing and pressing resistance of the electric connector is not less than 40 kg.

As a further improvement of the present invention, the rear cover plate has a fitting portion located at a middle portion in a transverse direction thereof and fixed to the insulating body.

As a further improvement of the present invention, the reinforcing member has at least a pair of the wing portions located on both sides in the lateral direction thereof to be combined with the wing portions of the fixed housing to mount the electrical connector to the circuit board together, and to make the pushing resistance of the electrical connector not less than 40 kg.

As a further improvement of the present invention, the shielding case further has a second stopper portion projecting rearward to limit the reinforcement.

As a further improvement of the present invention, the reinforcement includes a lower cover plate, a pair of side cover plates located at both sides of the lower cover plate in the transverse direction and a rear cover plate located at the rear side of the lower cover plate, the rear cover plate is integrally connected with the lower cover plate and the side cover plates to cover four sides of the shielding shell, a pair of wing portions of the reinforcement is bent and extended to form from the corresponding side of the side cover plate.

As a further improvement of the present invention, 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 from the tongue plate and being curved, each second conductive terminal has a second contact portion protruding from the tongue plate and being straight, in the front-back direction, the second contact portion is located in the front of the first contact portion, the tail portion is located the top end of the fixing portion extends backward and is exposed in the outside of the base portion, and the tail portion is curved so as to contact the circuit board with the mode elastic contact of avoiding welding.

The utility model discloses the electric connector is through being fixed in shield the reinforcement at casing rear portion and come the reinforcing to shield the structural strength of casing to promote electric connector's resistant ability of bulldozing.

Drawings

Fig. 1 is a perspective assembly view of a first embodiment of an electrical connector according to 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 clearer, 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 insulating housing 1, at least one set of conductive terminals 2 fixed to the insulating housing 1, and a shielding shell 3.

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 and is exposed from the fixing portion 22 to the rear side in the horizontal direction outside the base portion 11, and the tail portion 23 is curved to make elastic contact with the circuit board in a manner of avoiding soldering.

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.

Further, each tail portion 23 has an abutting portion 231 formed to be downwardly arched to be in elastic contact with the circuit board, and in the front-rear direction, the abutting portion 231a of the first conductive terminal 2a is located at 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 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, and the connecting portion 24 of the first conductive terminal 2a extends along the front-back direction and is limited in the limiting groove 1124 and the receiving 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. The second conductive terminals 2b are 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 second conductive terminals 2b along the height direction, and the through holes 121 and the conductive terminals 2 in the second conductive terminals 2b are correspondingly arranged so as to partially expose the conductive terminals 2 outwards. 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 shielding shell 3 has a receiving space 30 opened forward, and the tongue plate 12 is exposed in the receiving space 30. Specifically, the shielding shell 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 a fixed housing 4 fixed to one side of the shielding housing 3 and a reinforcing member 5 fixed to the rear portion of the shielding housing 3, the fixed housing 4 has at least a pair of wing portions 101 for being mounted on an external circuit board, and each wing portion 101 is provided with a mounting hole for being mounted on the external circuit board.

The fixed shell 4 comprises a main body portion 41 and an extending portion 42 integrally extending backward from the main body portion 41, the main body portion 41 is fixed with the shielding shell 3 and covers the upper side of the tongue plate 12, in the preferred embodiment of the present invention, the main body portion 41 is connected with the shielding shell 3 by welding; 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 a shielding range of the fixed housing 4 in the front-rear direction, specifically, the tail portion 23 is exposed to the rear side of the shielding housing 3 and is exposed downward in the shielding range below the extending portion 42 of the fixed housing 4, that is, the tail portion 23 is not exposed outward when viewed from above the electrical connector 100, so that the fixed housing 4 can well shield the conductive terminal 2, absorb external electromagnetic waves, and also suppress electromagnetic waves of itself, thereby achieving 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 shielding shell 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 and fixedly connected to the shielding shell 3, and when the electrical connector 100 is subjected to a pushing force in the mating direction, the pushing resistance of the electrical connector 100 when the electrical connector 100 is subjected to an external pushing force is enhanced to not less than 40 kg, that is, when the external pushing force 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 back 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 action force, the shielding shell 3 is firstly subjected to the pushing action force, the shielding shell 3 can maintain a normal shape to avoid deformation and disintegration by virtue of the support of the reinforcement 5, when the pushing action force is gradually enhanced, the shielding shell 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 since the second stopping portion 322 is located under the rear cover plate 51, the second stopping portion 322 can provide stopping and limiting effects for the reinforcement 5 at this time, 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 action 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 shield case 3. In this embodiment, the reinforcing member 5 is installed to the rear side of the shielding shell 3 from the rear to the front, the fitting portion 511 is inserted into the fitting groove 1127 from the front, the side cover plate 52 is coupled to the shielding shell 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 shielding shell 3 by welding, however, in other embodiments of the present invention, the side cover plate 52 may be fixed to the shielding shell 3 by only one of the second coupling portion 521 and the welding.

In the present invention, the shielding housing 3 is not provided with a fixing leg fixed to the external circuit board, but is fixedly mounted on the circuit board through the wing 101 of the fixing housing 4 (or the fixing housing 4 and the reinforcing member 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 fixed housing 4, and the insulating member 6 completely covers the tail portion 23 from above. In this embodiment, the insulating member 6 is in the shape of a sheet and is attached to the inside of the extending portion 42 of the fixed housing 4.

As shown in fig. 8 to 9, for the second embodiment of the electrical connector 100 'of the present invention, the basic composition and structure of the electrical connector 100' are the same as those of the electrical connector 100 in the first embodiment, and also include an insulating body 1', at least one set of conductive terminals 2', and a shielding housing 3', a fixing housing 4', and a reinforcing member 5 'covering the insulating body 1', which are not repeated herein, and the following description is made only by the 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 lateral direction thereof to cooperate with the corresponding wings 101' of the fixing 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 shielding shell 3' is bent to form a second stopping portion 343 'that abuts against the insulating body 1'.

As shown in fig. 10 to 12, for the third embodiment of the electrical connector 100 ", the basic composition and structure of the electrical connector 100" are also the same as the electrical connector 100 in the first embodiment, and also include an insulating body 1 ", at least one set of conductive terminals 2", and a shielding shell 3 ", a fixing shell 4", and a reinforcing member 5 "covered outside the insulating body 1", and other similar structures are not repeated herein, and are described below only with their differences:

in this embodiment, similarly to the second embodiment, the reinforcing member 5 "also has a pair of wing portions 101" on both sides in the lateral direction thereof to cooperate with the wing portions 101 "of the fixed housing 4" to mount the electrical connector 100 "to an external circuit board and to make the electrical connector 100" withstand a force of not less than 40 kg in the mating direction.

In addition, the fixed housing 4 "covers one side of the shield housing 3" in the height direction, and the reinforcement 5 "covers the other side of the shield housing 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 shield case 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', 100 "of the present invention enhances the structural strength of the shielding shell by the reinforcing members 5, 5', 5" fixed to the rear portion of the shielding shell 3, 3', 3 ", thereby improving the pushing resistance of the electric connector 100, 100', 100"; and its mounting on the external circuit board is achieved by a fixing housing 4, 4', 4 "fixed to one side of the shielding housing 3, 3', 3" to make its mounting more secure.

The above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present invention.

Claims (10)

1. An electric connector comprises an insulating body, at least one group of conductive terminals and a shielding 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 and electrically connected to an external circuit board, the shielding shell is provided with a containing space which is arranged in a forward opening mode, and the tongue plate is protruded out of the containing space, and the electric connector is characterized in that: the electrical connector further includes a stiffener secured to the rear of the shutter housing.

2. The electrical connector of claim 1, wherein: the electric connector also comprises a fixed shell fixed on one side of the shielding shell, the fixed shell is provided with at least one pair of wing parts used for being installed on an external circuit board, the fixed shell comprises a main body part and an extension part integrally and backwards extended from the main body part, the main body part and the shielding shell are fixed and cover the upper side of the tongue plate, and the extension part covers the upper side of the base part.

3. The electrical connector of claim 2, wherein: the shielding shell is provided with a top wall, a bottom wall and a pair of side walls for connecting the top wall and the bottom wall, the insulating body is also provided with a pair of clamping grooves, and the rear end of the bottom wall is provided with a first stopping part which is bent and extends into the corresponding clamping groove.

4. The electrical connector of claim 3, wherein: the extension portion is provided with a pair of buckling portions located at the bottom of the extension portion and used for buckling the base portion, the top wall is provided with a pair of elastic arms, and the main body portion is correspondingly provided with a yielding groove for yielding the elastic arms.

5. The electrical connector of claim 1, wherein: the reinforcing piece is provided with a rear cover plate covering the rear side of the shielding shell and a pair of side cover plates oppositely arranged on two sides of the rear cover plate, and the pair of side cover plates are respectively fixedly connected with the shielding shell and enable the pushing resistance of the electric connector to be not less than 40 kilograms.

6. The electrical connector of claim 5, wherein: the rear cover plate has a fitting portion located at a middle portion in a transverse direction thereof and fixed to the insulating body.

7. The electrical connector of claim 2, wherein: the reinforcing member has at least one pair of wing portions on both sides in the transverse direction thereof to cooperate with the wing portions of the stationary housing to mount the electrical connector to the circuit board and to make the pushing resistance of the electrical connector not less than 40 kg.

8. The electrical connector of claim 5 or 7, wherein: the shielding shell is also provided with a second stopping part protruding backwards to limit the reinforcing part.

9. The electrical connector of claim 7, wherein: the reinforcing member includes a lower cover plate, a pair of side cover plates positioned on both sides of the lower cover plate in the transverse direction, and a rear cover plate positioned on the rear side of the lower cover plate, the rear cover plate is integrally connected with the lower cover plate and the side cover plates to cover the four sides of the shielding shell, and a pair of wing portions of the reinforcing member are formed by bending and extending the side cover plates on the corresponding sides.

10. The electrical connector of any one of claims 1 to 7, wherein: 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 exposed on the tongue plate and is bent, each second conductive terminal is provided with a second contact part which is exposed on the tongue plate and is straight, 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 top end of the fixing part and is exposed outside the base part, and the tail part is bent to elastically contact with the circuit board in a welding-free mode.

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