TW201535877A - Electrical connector and assembly method - Google Patents

Abstract

An electrical connector assembly, comprises a first connector and a second connector mating with the first connector. The first connector includes an insulative housing, a plurality of contacts retained in the insulative housing and a shell covering the insualtive housing to define a receiving cavity. The insulative housing has a mating tongue extending into the receiving cavity, and the contacts have contacting portions disposed on the mating tongue. The second connector has an insulative base, a plurality of terminals and a cover covering the insualtive base to define a mating cavity. The terminals have contacting portions exposed in the mating cavity. The shell of the first connector has a clamp near a rear of the receiving cavity, and correspondingly, the second connector has a notch in a front edge of the insulative base to expose a part of the cover. When the first connector mates the second connector, the clamp clamps the part of the cover.

Description

Electrical connector and combination thereof

The present invention relates to an electrical connector assembly.

In connection with the invention of the electrical connector assembly of the present invention, the plug can be inserted in the forward and reverse directions, i.e., when we flip the plug, the function is the same whether it is top up or bottom up. However, the contact between the plug and the socket of the prior related electrical connector assembly is generally only that the iron shell of the socket forms a spring that opposes the plug housing, however, this contact is less stable.

Therefore, it is necessary to provide an improved electrical connector to overcome the above drawbacks.

The technical problem to be solved by the present invention is an electrical connector assembly in which the connection between the plug and the socket is more stable.

To solve the above technical problem, the technical means of the present invention is an electrical connector assembly comprising: a first connector and a second connector that interfaces with the first connector. The first connector includes an insulative housing, a plurality of terminals fixed to the insulative housing, and a metal housing covering the insulative housing to form a receiving cavity, the insulative housing having a mating tongue extending forwardly into the receiving cavity. The terminal has a contact portion exposed on a surface of the mating tongue, the metal casing includes an outer peripheral wall and an extension portion bent from the rear edge of the outer peripheral wall into the receiving cavity, the extending portion entering the receiving cavity and resisting the corresponding outer periphery The walls, both form a clamping member. The second connector includes an insulating substrate, a plurality of terminals, and a metal casing attached around the insulating substrate, the insulating substrate defining a docking cavity for receiving the abutting tongue, the terminal of the second connector having an exposed In the contact portion in the mating cavity, the insulating base body is provided with a through gap at a front edge thereof, and the metal shell is correspondingly provided with a fitting portion exposed from the notch into the mating cavity. When docked, the mating portion of the second connector is clamped by the clip member of the first connector.

In order to solve the above technical problem, the technical means of the present invention is an electrical connector capable of being mounted on a printed circuit board, the electrical connector comprising an insulative housing, a plurality of terminals and a metal housing, the insulative housing having a forwardly extending butt joint a tongue plate, the terminal being fixed to the insulative housing and having a contact portion exposed on a surface of the mating tongue. The metal housing encloses the insulative housing to form a receiving cavity, and the mating tongue extends into the receiving cavity. The metal housing is provided with an outer peripheral wall and an elastic arm, and the elastic arm is provided with an arc portion and an inclined portion extending from the curved portion to extend forward, the arc portion is located in the receiving cavity and elastically resists the The outer peripheral wall forms a clamped state.

In the electrical connector assembly of the present invention, the metal housing of the first connector can hold the metal housing of the second connector as compared to the prior art, and the mechanical and electrical connection between the two can be enhanced.

The first figure is a socket of the first embodiment of the present invention and a plug that has not been docked, wherein the socket is mounted on a printed circuit board.

The second figure is a front view of the socket mounted on the printed circuit board as shown in the first figure.

The third figure is a partially exploded perspective view of the socket shown in the first figure.

The fourth figure is a partial enlarged view of the plug shown in the first figure.

The fifth figure shows a cross-sectional view of the socket and the plug shown in the first figure.

Fig. 6 is a perspective view showing the electrical connector of the second embodiment of the present invention mounted on a circuit board.

The seventh figure is a front view of the electrical connector shown in the sixth figure.

Figure 8 is a cross-sectional view of the electrical connector shown in Figure 6 taken along line VIII-VIII.

The ninth drawing is an exploded perspective view of the electrical connector shown in the eighth figure.

Figure 11 is a perspective view of the shield plate of the electrical connector shown in Figure IX.

Figure 11 is a plan view of the terminal module assembly of the electrical connector shown in Figure 6.

Figure 12 is a bottom plan view of the terminal module assembly of the electrical connector shown in the sixth figure.

Figure 13 is a cross-sectional view of the electrical connector shown in the sixth figure.

Figure 14 is another cross-sectional view of the electrical connector shown in Figure 6.

Fig. 15 is a perspective view showing the socket connector of the third embodiment of the present invention mounted on a circuit board.

Figure 16 is an exploded perspective view of the socket connector shown in Figure 15.

Figure 17 is an exploded perspective view showing the terminal module assembly of the socket connector shown in Figure 16.

Figure 18 is a cross-sectional view of the receptacle connector shown in Figure 15 taken along the dashed line XVIII-XVIII.

Fig. 19 is a modified embodiment of the electrical connector in the second embodiment.

Fig. 20 shows the electrical connector of the fourth embodiment.

The first to fifth figures show a socket 100 mounted on a printed circuit board 109, which may also be referred to as a first connector, and a plug connector 200 that interfaces therewith, which may also be referred to as a second connector.

Referring to the second to third figures, the socket 100 includes an insulative housing 11 , a metal housing 12 that encloses the insulative housing 11 to form a receiving cavity 101 , and a plurality of terminals 13 . The insulative housing 11 is provided with a tongue 111 extending forwardly and in the receiving cavity 101. The terminal 13 is provided with a contact portion 131 exposed on two opposite surfaces of the tongue plate 111.

Referring to the first figure, the metal casing 12 of the socket 100 includes a peripheral wall 124 (refer to the third figure) wound around the capsule shape and a back cover 121 bent downward from the top rear side of the outer peripheral wall. The rear cover 121 A locking elastic piece 1213 is provided. The metal housing 12 further includes a locking hole (not labeled) that is matched with the locking elastic piece 1213 to fix the rear cover 121 to the metal housing 12. The rear cover 121 is also provided with a pair of mounting legs 1211 that are soldered to the printed circuit board 109. In the present embodiment, the rear cover 121 is closely attached to the rear end surface of the insulative housing 11 to effectively prevent the insulative housing 11 from moving backward when the inserted plug 200 is pushed backward. And because of the mounting foot 1211, the backward pressure applied to the back cover 121 can be transmitted to the printed circuit board 109. On the other hand, it can be understood that the bottom wall rear edge of the outer peripheral wall 124 of the metal casing 12 can prevent the insulating body 11 from moving forward to fix the metal casing 12 to the insulative body 11 in the front-rear direction in cooperation with the rear cover 121. . In the present embodiment, the rear cover 121 is provided with an opening 1212 between the pair of mounting legs 1211 to allow the mounting legs 132 of the terminal 13 to extend horizontally rearwardly out of the rear cover 121. Alternatively, the foot 132 can be a perforated pattern, and the back cover 121 can be a complete piece without the opening 1212.

Referring to the second to fifth figures, the metal casing 12 continues to extend at its rear edge of the outer peripheral wall 124 with an extending portion 122. In the present embodiment, the clamping member 123 is formed on the bottom wall, in other In the embodiment, it may be provided on the top wall or both side walls of the outer peripheral wall 124 of the metal casing 12. In the present embodiment, the extending portion 122 is two elastic arms that are parallel to each other and separated from each other, and the extending portion 122 is bent forward into the receiving cavity 101, and each extending portion 122 is provided with a face down. The curved portion 1221 and the inclined portion 1222 that continues from the curved portion 1221 to extend forward and upward. The curved portion 1221 of the extending portion 122 elastically abuts against the bottom wall to form a clamped state, which together form the clip member 123. The insulative housing 11 is provided with a recess 113 that is recessed from the bottom surface of the insulative housing 11 and penetrates forwardly from the receiving cavity 109 to correspond to a portion of the structure that accommodates the extending portion 122.

Referring to the first and fourth figures, the plug 200 includes an insulating base 21, a plurality of terminals, and a metal outer casing 22 attached to the periphery of the insulating base 21. The insulating base 21 is formed with a mating cavity 201, and the terminal is disposed in the docking cavity 201. The contact portion 232 of the opposite inner side. The front edge of the insulating substrate 21 defines a pair of notches 211 for inwardly exposing the metal casing 22 corresponding to the region. The portion of the exposed metal casing 22 is referred to as a mating portion 221, and the notch 221 is vertically symmetrically disposed, that is, the metal casing 22 includes upper and lower sides. Two mating portions 221 . At the time of docking, the fitting portion 221 of the plug 200 on the lower side is inserted between the extending portion 122 of the socket 100 and the bottom wall, that is, sandwiched by the sandwiching member 123. Since the plug 200 is provided with the upper and lower fitting portions 221, the engaging member 221 is clamped by the engaging portion 221 regardless of which of the mating directions of the plug 200 with respect to the socket 100. The mechanical and electrical connection between the plug 200 and the socket 100 can be enhanced by the clamping fit between the metal housing 22 of the plug 200 and the metal housing 12 of the socket 100.

6 to 9 show an electrical connector 400 of a second embodiment for mounting on a circuit board 401, which includes a metal housing 45 and a terminal module assembly 41, and a terminal module assembly 41. The upper and lower terminal modules 411 and 412 and the middle shielding module 413 having the shielding plate 44 sandwiched therebetween are stacked and assembled in the vertical direction to form a terminal block. The middle shielding module 413 The front end forms a butt tongue 413', and the upper and lower terminal modules 411, 412 are embedded with terminals 421, 422, and the terminal contact portions 4211, 4221 are arranged on the butt tongue 413'. The metal casing 45 is fixedly mounted on the terminal module assembly 41 from the front to the rear. The rear cover 451 of the metal casing 45 covers the rear end surface of the terminal block, and the rear end of the lower wall of the metal casing 45 is pressed against the upper and lower terminal modules 411 and 412. The front edge of the metal casing 45 is stably held by the rear wall rear end terminal assembly 41 and the rear wall mating terminal module assembly 41. The rear cover 451 is provided with a bent piece 452 which is bent forward to the side wall of the metal casing 45, and the bent piece is provided with a fastening piece 454 which is inwardly fastened to the terminal block. The middle shielding module 413 includes the abutting tongue 413' on the front side and a fixing portion on the rear side, and the fixing portion is sandwiched between the upper and lower insulators.

The metal casing 45 of the electrical connector 400 forms a docking cavity 402 around the butting tongue 413'. As seen in the seventh figure, the contour of the docking cavity 402 is short by two parallel long sides 403 and two arcs as seen from the butt end. The sides 404 are connected.

As shown in the tenth to fourteenth drawings, the shielding plate 44 can reinforce the function of the abutting tongue 413' in addition to the shielding effect. The shielding plate 44 is further provided with two notches 441 and a thin portion 442 extending through the front edge (the thin portion 442 may even be a through groove), and the front edge 443 slightly protrudes forwardly from the front edge of the corresponding abutting tongue 413'. The two side edges 447 projecting from the corresponding side edges of the mating tongue 413' can effectively prevent the plug connector from damaging the butt tongue 413' when docked. As shown in the tenth to twelfth drawings, the notch 441 is just aligned with the corresponding ground terminal 421g in the up-and-down direction, and thus the ground terminal 421g overlaps the shielding plate 44. At the same time, the inner side of the notch 441 is retracted to the front edge of the butt tongue 413' to aid in molding. On the other hand, when the plug connector is inserted in the initial state, the other terminals of the plug connector can contact the front edge of the shield plate 44. The thin portion 442 extends laterally, so that the thinned front edge 442 can allow the front end of the corresponding terminal 421, 422 to move inwardly elastically, thereby forming a guiding front end, which has a better fixing function and facilitates insertion, avoiding short circuit. risks of. The shielding plate 44 is provided at its rear end with a thin-shaped region 446 which extends in the front-rear direction and precisely aligns the high-speed signal terminals, thereby improving the electrical performance of the high-speed signal terminals. Each side edge 447 is also provided with a fastening notch 448 protruding from the side edge of the butt tongue 413', the fastening notch 448 is used for fixing with the metal fastening member of the plug connector, and the plug connector is inserted into the socket connection. When the docking cavity of the device is engaged, the latching member of the plug connector is buckled in the latching notch 448. The elastic piece 444 is electrically connected to the metal casing 45.

Further, the thin portion 442 is a recessed structure which is provided as a shallow groove 442a structure on the opposite surfaces of the shielding plate 44 or a through groove structure penetrating the opposite surfaces of the shielding plate 44. When the shielding plate 44 is injection molded by the insulating material into the middle shielding module 413, the shallow groove 442a is filled with the insulating material. The front thin portion 442 has a first surface 4421 facing rearward, a second surface 4422 facing forward, and two third surfaces 4423 located on both lateral sides. Referring to the thirteenth to fourteenth drawings, after the insulating material is cooled, a part of the insulating material forming the butting tongue 413' (ie, the middle shielding module 413) is formed as a convex portion 4133 located in the thin region, the convex The upper portion is filled with the groove structure, which presses the first surface 4421 forward and presses the second surface 4422 backward, so that the abutting tongue 413' and the shielding plate 44 can be effectively fixed in the front-rear direction. The third surface 4423 is pressed against the projection 4133 in the lateral direction, thereby stably fixing the abutting tongue 413' and the shielding plate 44 in the lateral direction. When the groove structure is a through groove, the front edge 443 is connected to the body portion of the shielding plate 44 through the neck portion 449.

The fifteenth through eighteenth views show the receptacle connector 700 of the third embodiment, which is mounted in the notch P1 of the circuit board P. The socket connector 700 includes an upper injection molded part 71 and a main injection molded part 72. The upper injection molded part includes a terminal 73 and an insulator 711 which is injection molded on the terminal 73 to form an upper injection molded part. The main injection molded part 72 includes a shielding plate 74 and is injection molded on the shielding plate 74. The insulator 721, the main injection molded part 72 includes a base 722 and a complete butt tongue 723. The upper injection molded part 71 is assembled downwardly to sit on the main injection molded part 72, thereby forming a complete terminal module assembly, and the insulator 711 of the upper injection molded part and the base 722 of the main injection molded part are fixed to each other to form a base of the terminal module combination. The contact portion of the terminal 73 is received in the terminal groove of the upper surface of the mating tongue 723. The outer side of the terminal module assembly is surrounded by the socket shielding case 75, and then mounted on the circuit board P. The insulator portion of the terminal module combination is The socket is insulated body. As shown in Fig. 18, the intermediate portion of the terminal 73 is buried at the bottom of the insulator 711, and the contact portion extends out of the insulator, and the injection molding process of the structure is relatively simple. The front portion of the front edge of the shielding plate 74 continues to extend forwardly from the front projection 741, and the front projection 741 protrudes from the corresponding front edge of the abutment tongue 723. In the present embodiment, the main injection molded member 72 has no terminals, and it can be seen from the eighteenth diagram that the terminal structure can of course be provided. As with the prior invention of the present applicant, the shielding plate 74 of the present embodiment has a locking notch 742 on both sides thereof for fastening with the locking member of the plug connector, and details are not described herein.

Referring to FIG. 17, the shielding plate 74 includes a front thin portion 743 which is formed in a groove structure on the front end surface of the shielding plate 74. When the butting tongue 723 is injection molded on the shielding plate 74, the abutting tongue 723 has The recessed portion 7230 is filled. The groove defines a first face 7431 facing rearward, a second face 7432 facing forward, and two third faces 7432 facing away from each other, the faces being closely pressed against the projections 7230, that is, being completed during injection molding. Thereby, the butt tongue 723 and the shielding plate 74 are stably joined together.

Fig. 19 shows a cross-sectional structure of the receptacle connector 10 similar to the second embodiment, the shield panel 28 is provided with a thin section 42 having a rearward first face 421 and a forwardly facing second face 422 The insulating material forming the butting tongue 30 fills the thin portion 42 and the cooled insulating material is tightly bonded to the first surface 421 and the second surface 422, thereby restricting the front and rear of the insulating material forming the butting tongue 30. The movement, especially when the plug connector 500 is inserted, pushes the front and rear direction of the butt tongue. The thin portion of the shielding plate 28 is further provided with a thin portion having a rearward first surface 451 and a forwardly facing second surface (not shown).

Fig. 19 shows a cross-sectional structure similar to the socket connector 10 of the first embodiment, the shielding plate 28 is provided with a groove structure 46 having a first face 461 facing rearward and a second face facing forward 462, the insulating material forming the butting tongue 30 fills the groove structure 42 to form the protruding portion 31, and the cooled insulating material is tightly combined with the first surface 461 and the second surface 462, thereby restricting the formation of the butt tongue. The forward and backward movement of the insulating material of the board 30, especially when the plug connector 500 is inserted, pushes the front and rear direction of the butt tongue. A second groove structure 48 is further disposed behind the shield plate 28, the second groove structure 48 defining a first face 481 facing rearward and a second face facing forward (not shown).

FIG. 20 shows a socket connector 600 of a fourth embodiment. The socket connector 600 includes a terminal module assembly and a metal housing 65. The terminal module combination is a multi-chip type, and the terminal module assembly includes an upper terminal module 61. The lower terminal module 62 and the shielding plate 54 are sandwiched between the upper and lower terminal modules 61 and 62. Each of the terminal modules 61 and 62 includes a body portion 611 and 621 and extends from the body portion. The tongues 612, 622 and the terminals 613 injection molded in the body portions 611, 621 and the tongue plates 612, 622 (the terminals of the lower terminal module 622 are not shown for angle reasons), the body portion 611 and the tongue plates 612, 622 are insulators . The contact portions of the terminals 613 are arranged on the upper and lower surfaces of the upper and lower tongue plates 612, 622, respectively. The main body portion 611 of the upper terminal module 61 and the tongue plate 612 form an upper insulator, and the body portion 612 of the lower terminal module 62 forms a lower insulator with the tongue plate 622, and the tongue plates 612, 622 together form abutting tongue. The shielding plate 54 is sandwiched between the upper insulator and the lower insulator. The metal casing 65 is wrapped around the outer side of the upper and lower terminal modules 61, 62 to form a docking cavity, and the docking tongue is located in the docking cavity. The upper and lower terminal modules are respectively provided with protrusions 614 and 625 and concave holes 624 for protruding insertion, and the shielding plate 54 has perforations 541 and 542 through which the protrusions pass. The elastic piece 543 extending from the rear ends of the shielding plate can press the metal casing 65 against the metal casing 65.

In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above embodiments, and those skilled in the art will be able to make equivalent modifications or variations in accordance with the spirit of the present invention. It should be covered by the following patent application.

109‧‧‧Printed circuit board

100‧‧‧ socket

11‧‧‧Insulation body

101‧‧‧ containment chamber

12‧‧‧Metal housing

13‧‧‧ Terminal

111‧‧‧ tongue plate

131‧‧‧Contacts

124‧‧‧ peripheral wall

121‧‧‧Back cover

1213‧‧‧ buckle film

1211‧‧‧Installation feet

1212‧‧‧ openings

122‧‧‧Extension

1221‧‧‧Shade

1222‧‧‧ inclined section

123‧‧‧Clamp components

113‧‧‧ dent

200‧‧‧ plug connector

21‧‧‧ base

22‧‧‧Metal casing

201‧‧‧ docking chamber

232‧‧‧Contacts

211‧‧ ‧ gap

221‧‧‧Coordination Department

400‧‧‧Socket connector

401‧‧‧ boards

402‧‧‧ docking chamber

403‧‧‧Longside

404‧‧‧ Short side

41‧‧‧Terminal module combination

411‧‧‧Upper terminal module

412‧‧‧Bottom terminal module

413‧‧‧Shielding module

413’‧‧‧Connecting tongue

421, 422‧‧‧ terminals

4211, 4221‧‧‧Contacts

44‧‧‧Shielding board

441‧‧‧ gap

421g‧‧‧ Grounding terminal

442, 446‧‧‧ thin section

443‧‧‧ front edge

444‧‧‧Shrap

442a‧‧‧ shallow groove

447‧‧‧ side edge

448‧‧ ‧ gap

4421‧‧‧ first side

4422‧‧‧ second side

4423‧‧‧ third side

4133‧‧‧Protruding

45‧‧‧Metal housing

451‧‧‧Back cover

452‧‧‧Fold

454‧‧‧Buckle film

700‧‧‧Socket connector

P‧‧‧PCB

P1‧‧ ‧ gap

71‧‧‧Upper injection molded parts

72‧‧‧Main injection molded parts

73‧‧‧terminal

711‧‧‧Insulator

74‧‧‧shading board

721‧‧‧Insulator

722‧‧‧ base

723‧‧‧Connecting tongue

741‧‧‧Protruding

742‧‧‧Lock gap

743‧‧‧ front thin section

7230‧‧‧Protruding

7431‧‧‧ first side

7432‧‧‧ second side

7432‧‧‧ third side

28‧‧‧Shielding board

46‧‧‧ Groove structure

461‧‧‧ first side

462‧‧‧ second side

30‧‧‧Connecting tongue

31‧‧‧Protruding

500‧‧‧ plug connector

48‧‧‧second groove structure

481‧‧‧ first side

600‧‧‧ socket connector

65‧‧‧Metal casing

61‧‧‧Upper terminal module

62‧‧‧Bottom terminal module

54‧‧‧shading board

611, 621‧‧ ‧ Body Department

612, 622‧‧ ‧ tongue plate

613‧‧‧ terminals

614, 625‧‧ ‧ stud

624‧‧‧ recessed hole

541, 542‧‧‧ perforation

543‧‧‧Shrap

no

122‧‧‧Extension

1221‧‧‧Shade

1222‧‧‧ inclined section

113‧‧‧ dent

Claims (10)

An electrical connector assembly comprising:
a first connector, the first connector includes an insulative housing, a plurality of terminals fixed to the insulative housing, and a metal housing covering the insulative housing to form a receiving cavity, the insulative housing having a forward extending into the receiving cavity In the inner butt tongue, the terminal has a contact portion exposed on a surface of the mating tongue, the metal shell includes an outer peripheral wall and an extension portion bent from the rear edge of the outer peripheral wall into the receiving cavity, the extending portion enters the receiving portion The cavity and the corresponding peripheral wall, the two forming a clamping member; and the second connector, the second connector is connectable with the first connector, the second connector comprising an insulating base, a plurality of terminals and attached a metal casing around the insulating substrate, the insulating substrate defining a mating cavity for receiving the abutting tongue, the terminal of the second connector having a contact exposed in the mating cavity, the insulating substrate being in front of The edge is provided with a through hole, and the metal casing is correspondingly provided with a fitting portion exposed from the notch to the mating cavity. When the butt joint is engaged, the engaging portion of the second connector is clamped by the clamping member of the first connector The electrical connector assembly of claim 1, wherein the second connector is provided with two notches and two corresponding mating portions respectively located on upper and lower sides of the mating cavity, regardless of the first connector Which direction is inserted into the second connector, one of the two mating portions of the metal casing is held by the above-mentioned clip member. The electrical connector assembly of claim 1, wherein the extension extends from a rear edge of the bottom wall of the peripheral wall, and includes two resilient arms that are parallel to each other and separated from each other. The electrical connector assembly of claim 3, wherein each of the resilient arms is provided with a downwardly facing curved portion and an upwardly inclined upward portion from the curved portion, the curved portion resiliently resisting The bottom wall forms a clamped state. The electrical connector assembly of claim 4, wherein the insulating body of the first connector is provided with a recess, the recess is recessed from the bottom surface of the insulating body and penetrates forwardly with the receiving cavity to correspondingly accommodate the extending portion. Part of the structure. An electrical connector capable of being mounted on a printed circuit board, the electrical connector comprising an insulative body having a forwardly extending butt tongue;
a plurality of terminals fixed to the insulative housing and having contacts exposed on a surface of the mating tongue;
And a metal casing covering the insulative housing to form a receiving cavity, the mating tongue extends into the receiving cavity, the metal casing is provided with an outer peripheral wall and an elastic arm, and the elastic arm is provided There is an arc portion and an inclined portion extending from the arc portion to extend forward, the arc portion being located in the receiving cavity and elastically abutting the outer peripheral wall to form a clamping state. The electrical connector of claim 6, wherein the elastic arm is formed by being bent forward from a rear edge of the bottom wall of the outer peripheral wall and bent into the receiving cavity, the curved portion being connected to the bottom wall. The electrical connector of claim 7, wherein the electrical connector comprises two of the above-described resilient arms, the two resilient arms being parallel to each other and separated from each other. The electrical connector of claim 6, wherein the insulating body is provided with a recess that is recessed from the bottom surface of the insulating body and penetrates forwardly with the receiving cavity to correspondingly receive the curved portion of the elastic arm. The electrical connector of claim 6, wherein the metal housing further comprises a back cover bent downward from a top rear side of the outer peripheral wall, the rear cover being provided with a locking spring, the metal housing further comprising A latching hole that is mated with the latching spring to fix the back cover to the metal housing.