Electrical plug connector and electrical receptacle connector

An electrical plug connector includes an insulation housing, a metal shell and plural buckling members. The insulation housing includes an insertion cavity, plural lateral sides and plural assembling spaces. The insertion cavity is disposed at a front portion of the insulation housing. The lateral sides are disposed at two sides of the insulation housing. The assembling spaces are disposed at the lateral sides and communicate with the insertion cavity. The metal shell encloses the insulation housing. The buckling members are respectively disposed in the assembling spaces and each includes a arm portion, a hook portion and a soldering portion. The arm portion is disposed in the assembling portion, the hook portion is extended from a front portion of the arm portion toward the insertion cavity, and the soldering portion is extended from a rear portion of the arm portion and exposed out of the assembling space.

CROSS-REFERENCES TO RELATED APPLICATIONS

This non-provisional application claims priority under 35 U.S.C. §119(a) on Patent Application No. 103208542 and 103136076, filed in Taiwan, R.O.C. on 2014 May 15 and 2014 Oct. 17, the entire contents of which are hereby incorporated by reference.

FIELD OF THE INVENTION

The disclosure relates to an electrical connector, and particularly to an electrical plug connector and an electrical receptacle connector.

BACKGROUND OF THE INVENTION

Current electrical devices have multiple functions to provide significant convenience for people; however, electromagnetic waves which interfere with the functions and the signal transmissions of the electrical devices, are generated upon operating the electrical devices; for example, electromagnetic interference (EMI) or radio frequency interference (RFI).

USB, universal serial bus, is a common electrical connector interface applied to electrical devices; the USB 2.0 interfaces have been further developed to achieve faster USB 3.0 interfaces.

The conventional USB electrical receptacle connector and the conventional USB electrical plug connector induce signal interference, such as EMI, RFI, etc., upon transmitting signals, resulting in reduction of signal transmission quality. Therefore, improving the structure of the conventional electrical connector is an urgent matter for person skilled in the art to address.

SUMMARY

In view of this, the disclosure provides an electrical plug connector including a metal shell, an insulation housing, a plurality of upper-row elastic terminals, a plurality of lower-row elastic terminals and a plurality of buckling members. The metal shell has an accommodating cavity. The insulation housing is received in the accommodating cavity and includes an upper portion, a lower portion, an insertion cavity and a plurality of lateral sides. The insertion cavity is defined between the upper portion and the lower portion. The lateral sides are disposed at two sides of the insulation housing, respectively. The upper-row elastic terminals include a plurality of upper-row elastic signal terminals, at least one upper-row elastic power-supply terminal and at least one upper-row elastic ground terminal, and each of the upper-row elastic terminals is disposed at the insulation housing and located at a lower surface of the upper portion. The lower-row elastic terminals include a plurality of lower-row elastic signal terminals, at least one lower-row elastic power-supply terminal and at least one lower-row elastic ground terminal, and each of the lower-row elastic terminals is disposed at the insulation housing and located at an upper surface of the lower portion. The buckling members are disposed at the insulation housing. Each of the buckling members includes a arm portion, a hook portion and a soldering portion. The arm portion is disposed in the lateral side after the insulation housing is formed. The hook portion is extended from a front portion of the arm portion toward the insertion cavity. The soldering portion is extended from a rear portion of the arm portion and exposed out of the insulation housing.

The disclosure further provides an electrical plug connector including a metal shell, an insulation housing, a plurality of upper-row elastic terminals, a plurality of lower-row elastic terminals and a plurality of buckling members. The metal shell has an accommodating cavity. The insulation housing is received in the accommodating cavity and insulation housing includes an upper portion, a lower portion, an insertion cavity, a plurality of lateral sides and a plurality of assembling spaces. The insertion cavity is defined between the upper portion and the lower portion. The lateral sides are disposed at two sides of the insulation housing. The assembling spaces are disposed at the lateral sides, respectively. The assembling spaces communicate with the insertion cavity. The upper-row elastic terminals include a plurality of upper-row elastic signal terminals, at least one upper-row elastic power-supply terminal and at least one upper-row elastic ground terminal, and each of the upper-row elastic signal terminals is disposed at the insulation housing and located at a lower surface of the upper portion. The lower-row elastic terminals include a plurality of lower-row elastic signal terminals, at least one lower-row elastic power-supply terminal and at least one lower-row elastic ground terminal, and each of the lower-row elastic terminals is disposed at the insulation housing and located at an upper surface of the lower portion. The buckling members are respectively disposed at the lateral sides of the insulation housing. Each of the buckling members includes a arm portion, a hook portion and a soldering portion. The arm portion is disposed in the assembling space. The hook portion is extended from a front portion of the arm portion toward the insertion cavity, and the soldering portion is extended from a rear portion of the arm portion and exposed out of the assembling space.

The disclosure also provides an electrical receptacle connector including a metal shell, an insulation housing, a plurality of upper-row plate terminals, a plurality of lower-row plate terminals and a grounding sheet. The metal shell has a receiving cavity. The insulation housing is received in the receiving cavity and insulation housing includes a base portion and a tongue portion extended from one side of the base portion. The tongue portion includes an upper surface and a lower surface. The upper-row plate terminals include a plurality of upper-row plate signal terminals, at least one upper-row plate power-supply terminal and at least one upper-row plate ground terminal, and each of the upper-row plate terminals is disposed at the base portion and the tongue portion and located at the upper surface. The lower-row plate terminals include a plurality of lower-row plate signal terminals, at least one lower-row plate power-supply terminal and at least one lower-row plate ground terminal, and each of the lower-row plate terminals is disposed at the base portion and the tongue portion and located at the lower surface. The grounding sheet is disposed at the insulation housing and includes a main body, a plurality of buckles and a plurality of soldering portions. The main body is disposed at the tongue portion. The buckles are disposed at two sides of the main body to be exposed out of two sides of the tongue portion. The buckles are respectively connected to the hook portions of the electrical plug connector. The soldering portions are respectively disposed at a rear portion of the main body.

As above, in the electrical plug connector of the disclosure, the arm portions are connected to the metal shell, and the soldering portions of the buckling members are connected to one circuit board; while in the electrical receptacle connector of the disclosure, the soldering portions of the grounding sheet are connected to another circuit board. Consequently, low-impedance grounding path can be provided upon the electrical plug connector being connected with the electrical receptacle connector, thereby reducing the EMI and RMI problems. Additionally, the soldering portions of the buckling members are soldered on the circuit board to provide the structural strength of the buckling members. Additionally, because the upper-row terminals and the lower-row terminals are arranged upside down, and the arrangement sequence of the upper-row plate contacts are left-right reversal with respect to the arrangement sequence of the lower-row plate contacts, an electrical plug connector is inserted into the interior of the electrical receptacle connector with the terminals of the electrical plug connector contacting with the upper-row plate contacts when plugged in a forward orientation, and the electrical plug connector is inserted into the interior of the electrical receptacle connector with the terminals of the electrical plug connector contacting with the lower-row plate contacts when plugged in a reverse direction. Consequently, the inserting orientation of the electrical plug connector is not limited.

The detailed features and advantages of the disclosure are described below in great detail through the following embodiments, the content of which is sufficient for those skilled in the art to understand the technical content of the disclosure and to implement the disclosure there accordingly. Based upon the content of the specification, the claims, and the drawings, those skilled in the art can easily understand the relevant objectives and advantages of the disclosure.

DETAILED DESCRIPTION

Please refer toFIG. 1,FIG. 2andFIG. 3, in which an electrical connector assembly300of the disclosure is illustrated;FIG. 1is an exploded view showing an electrical plug connector100and an electrical receptacle connector200of the electrical connector assembly300, andFIG. 2andFIG. 3are top sectional views respectively showing the electrical plug connector100is detached from or assembled with the electrical receptacle connector200. The electrical connector assembly300includes an electrical plug connector100and an electrical receptacle connector200.

Please refer toFIG. 4,FIG. 5andFIG. 6, in which an electrical plug connector100of a first embodiment of the disclosure is illustrated.FIG. 4is an exploded view (1) of the electrical plug connector100,FIG. 5is a lateral view of the electrical plug connector100of the disclosure while the metal shell12is eliminated from the electrical plug connector100, andFIG. 6is a perspective view of the electrical plug connector100of the disclosure while the metal shell12is eliminated from the electrical plug connector100. The electrical plug connector100is a USB type-C interface. In this embodiment, the electrical plug connector100includes an insulation housing11, a metal shell12, a circuit board13, a plurality of buckling members14and a plurality of plug terminals15.

Please refer toFIG. 4andFIG. 5, in which the insulation housing11is an elongated plate. The insulation housing11includes an upper portion111, a lower portion112, an insertion cavity113, a plurality of lateral sides114and a plurality of assembling spaces115. Here, the upper portion111and the lower portion112are formed by insert molding. The insertion cavity113is disposed at a front portion of the insulation housing11; that is, the insertion cavity113is defined between the upper portion111and the lower portion112. Furthermore, the upper portion111has a lower surface1111, and the lower portion112has an upper surface1121; the lower surface1111of the upper portion111corresponds to the upper surface1121of the lower portion112. The lateral sides114are disposed at two sides of the insulation housing11. The assembling spaces115are elongated groove structures and respectively disposed at the lateral sides114. A front end of each of the assembling spaces115is opened and communicates with the insertion cavity113; that is, the front ends of the assembling spaces115are adjacent to the insertion cavity113and respectively communicate with the insertion cavity113, and rear ends of the assembling spaces115are adjacent to two sides of the circuit board13.

The plug terminals15are disposed at the upper portion111and the lower portion112. The plug terminals15include a plurality of upper-row elastic terminals151and a plurality of lower-row elastic terminals152.

Please refer toFIG. 4A,FIG. 4BandFIG. 4C;FIG. 4Ais an exploded view (2) of the electrical plug connector100of the disclosure while the metal shell12is eliminated from the electrical plug connector100;FIG. 4Bis lateral sectional view of the electrical plug connector100of the disclosure;FIG. 4Cis a schematic configuration diagram of plug terminals15of the electrical plug connector100shown inFIG. 4B. In this embodiment, the upper-row elastic terminals151include a plurality of upper-row elastic signal terminals1511, at least one upper-row elastic power-supply terminal1512and at least one upper-row elastic ground terminal1513. Each of the upper-row elastic terminals151is disposed at the insulation housing11and located at the lower surface1111of the upper portion111. Referring toFIG. 4C, the upper-row elastic terminals151include, from left to right, an upper-row elastic ground terminal1513(Gnd), a first pair of differential signal terminals (TX1+−), a second pair of differential signal terminals (D+−), and a third pair of differential signal terminals (RX2+−) of the upper-row elastic signal terminals1511, upper-row elastic power-supply terminals1512(Power/VBUS) between the three pairs of differential signal terminals, a retain terminal (RFU), (the retain terminal and a configuration channel 1 (CC1) are respectively arranged between the upper-row elastic power-supply terminals1512and the second pair of differential signal terminals of the upper-row elastic signal terminals1511), and another upper-row elastic ground terminal1513(Gnd).

Please refer toFIG. 4A,FIG. 4BandFIG. 4C, in which each of the upper-row elastic terminals151includes an upper-row contact section1514, an upper-row connecting section1515and an upper-row soldering section1516. The upper-row connecting section1515is disposed at the upper portion111. The upper-row contact section1514is extended from one of two ends of the upper-row connecting section1515and disposed at the lower surface1111of the upper portion111, the upper-row soldering section1516is extended from the other end of the upper-row connecting section1515and extended out of the insulation housing11. The upper-row elastic signal terminals1511are extended toward the insertion cavity113and transmitting first signals (that is, transmitting specifications conformed to USB 3.0 signals). The upper-row soldering section1516is extended from a rear portion of the insulation housing11. Furthermore, the upper-row soldering section1516is bent horizontally, as shown inFIG. 4A.

Please refer toFIG. 4A,FIG. 4B, andFIG. 4C; in which the lower-row elastic terminals152are disposed at the insulation housing11and located at the upper surface1121of the lower portion112. In this embodiment, the lower-row elastic terminals152includes a plurality of lower-row elastic signal terminals1521, at least one lower-row elastic power-supply terminal1522and at least one lower-row elastic ground terminal1523. Refer toFIG. 4C, the lower-row elastic terminals152include, from left to right, a lower-row elastic ground terminal1523(Gnd), a first pair of differential signal terminals (TX2+−), a second pair of differential signal terminals (D+−), and a third pair of differential signal terminals (RX1+−) of the lower-row elastic signal terminals1521, lower-row elastic power-supply terminals1522(Power/VBUS) between the three pairs of differential signal terminals, a retain terminal (RFU), (the retain terminal and a configuration channel 2 (CC2) are respectively arranged between the lower-row elastic power-supply terminals1522and the second pair of differential signal terminals of the lower-row elastic signal terminals1521), and another lower-row elastic ground terminal1523(Gnd).

Please refer toFIG. 4A,FIG. 4BandFIG. 4Cagain, in which each of the lower-row elastic terminals152includes a lower-row contact section1524, a lower-row connecting section1525and a lower-row soldering section1526. The lower-row connecting section1525is disposed at the lower portion112. The lower-row contact section1524is extended from one of two ends of the lower-row connecting section1525and disposed at the upper surface1121of the lower portion112, and the lower-row soldering section1526is extended from the other end of the lower-row connecting section1525and extended out of the insulation housing11. The lower-row elastic signal terminals1521are extended toward the insertion cavity113for transmitting second signals (that is, transmitting specifications conformed to USB 3.0 signals). The lower-row soldering section1526is extended from the rear portion of the insulation housing11, provided to be aligned horizontally, as shown inFIG. 4A.

Please refer toFIG. 4A,FIG. 4BandFIG. 4C, in which embodiment the upper-row elastic terminals151and the lower-row elastic terminals152are respectively disposed at the lower surface1111of the upper portion111and the upper surface1121of the lower portion112. Furthermore, the upper-row elastic terminals151and the lower-row elastic terminals152are point-symmetrical with a central point of the accommodating cavity12aas the symmetrical center. Here, point-symmetry means, after the upper-row elastic terminals151(or the lower-row elastic terminals152) are rotated by 180 degrees with the symmetrical center as the rotating center, the upper-row elastic terminals151and the lower-row elastic terminals152are overlapped; that is, the rotated upper-row elastic terminals151are arranged at the position of the original lower-row elastic terminals152, and the rotated lower-row elastic terminals152are arranged at the position of the original upper-row elastic terminals151. In other words, the upper-row elastic terminals151and the lower-row elastic terminals152are arranged upside down, and the arrangement sequence of the upper-row elastic terminals151are left-right reversal with respect to the arrangement sequence of the lower-row elastic terminals152. The electrical plug connector100is inserted into the interior of the electrical receptacle connector200with a forward orientation for transmitting first signals; conversely, the electrical plug connector100is inserted into the interior of the electrical receptacle connector200with a reverse orientation for transmitting second signals. The specification for transmitting the first signals conforms to that for transmitting the second signals. Based on this, the inserting orientation of the electrical plug connector100is not limited, and can be forwarded or reversed, when plugging into the electrical receptacle connector200.

Please refer toFIG. 4A,FIG. 4BandFIG. 4Cagain; in which embodiment positions of upper-row elastic terminals151correspond to those of the lower-row elastic terminals152.

Please refer toFIG. 4andFIG. 5, in which the metal shell12is hollowed. The metal shell12has an accommodating cavity12atherein. The metal shell12encloses the insulation housing11; that is, the insulation housing11is secured in the accommodating cavity12a. In this embodiment, the metal shell12is formed by combining a plurality of frame structures, but embodiments are not limited thereto; in some implementation aspects, the metal shell12is formed by bending a unitary frame structure.

Please refer toFIG. 4andFIG. 5, in which the circuit board13is disposed at a rear portion of the insulation housing11. The circuit board13includes a plurality of grounding contacts131and a plurality of terminal contacts132. The grounding contacts131and the terminal contacts132are disposed at one side of the circuit board13, and the grounding contacts131are disposed at two sides of the terminal contacts132.

Please refer toFIG. 4andFIG. 5, in which the buckling members14are made by stamping or blanking techniques, but embodiments are not limited thereto; in some implementation aspects, the buckling members14are made by stamping techniques. The structural strength of the buckling member14made by blanking process is better than that resulting from stamping process. Each of the buckling members14is formed as an elongated plate. The buckling members14are respectively disposed at the two sides of the insulation housing11. Each of the buckling members14includes a arm portion141, a hook portion142and a soldering portion143. The arm portions141are elongated and are assembled in the assembling spaces115, respectively. An outer lateral side145of each arm portion141is exposed out of the assembling space115and connected to an inner lateral wall of the metal shell12. The hook portion142is extended from a front portion of the arm portion141and extended toward the insertion cavity113. The soldering portion143is extended from a rear portion of the arm portion141to pass through the rear portion of the assembling space115and exposed out of the insulation housing11. The soldering portions143are extended to connect to the grounding contacts131.

Please refer toFIG. 4D; in some implementation aspects, the insulation housing11is devoid of the assembling spaces115; that is, in such embodiment, the lateral sides114of the insulation housing11are devoid of groove structures; namely, the aforementioned assembling spaces115. Furthermore, in this embodiment, the arm portions141are combined to the lateral sides114of the insulation housing11upon integrally forming the insulation housing11, thus the arm portions141are securely positioned to the lateral sides114of the insulation housing11, so that the time for manufacturing the arm portions141can be omitted. That is, in this embodiment, the arm portions141are assembled on the raw material for molding the insulation housing11firstly, and then, by applying molding techniques, the arm portions141are embedded in the lateral sides114of the insulation housing11. Here, the hook portion142is extended along a direction from the front portion of the arm portion141toward the insertion cavity113; the soldering portion143is extended from the rear portion of the arm portion141to be exposed out of the insulation housing11. Each of the soldering portions143is respectively extended to connect to the grounding contacts131.

Please refer toFIG. 1andFIG. 4, in which embodiment the circuit board13is parallel connected to the rear portion of the insulation housing11, so that wires are developed from the circuit board13to allow the connector to be parts of a data transmission cable; alternatively, wires are omitted to allow the connector to be parts of a flash disk, but embodiments are not limited thereto. In some implementation aspects, the circuit board13is perpendicularly connected to the rear portion of the insulation housing11; that is, the electrical plug connector100can be combined with the circuit board13, so that the assembly between the insulation housing11, the metal shell12, and the circuit board13is formed as a standing-type charging docket, as shown inFIG. 10.

Please refer toFIG. 5andFIG. 6, in which embodiment the grounding contacts131are assembled at a surface of the circuit board13. The soldering portions143of the buckling members14are formed as horizontal soldering portions (called SMT pins, surface-mout technology pins) to be soldered on the grounding contacts131, respectively, but embodiments are not limited thereto; in some implementation aspects, the soldering portions143of the buckling members14are formed as vertical soldering portions (through-hole pins), and the circuit board13further includes a plurality of through holes133, the grounding contacts131are disposed at the through holes133, respectively, as shown inFIG. 10; that is, the soldering portions143of the buckling members14are capable of being inserted into the through holes133, respectively; next, soldering processes are applied to electrically connect the soldering portions143with the circuit board13. Additionally, in some implementation aspects, the metal shell12further includes a plurality of soldering plates121. The soldering plates121can be connected electrically to the circuit board13by means of horizontal soldering portions (SMT pins) or vertical soldering portions (through-hole pins). As shown inFIG. 10, the soldering plates121form vertical soldering portions (through-hole pins) for insertion into the through holes133to connect electrically with the circuit board13.

Please refer toFIG. 2, in which embodiment each of the buckling members14further includes a buckling block144. The buckling block144is a reversed protruded block structure; the buckling block144is respectively disposed at the arm portion141. The insulation housing11further includes a plurality of buckling slots116disposed at the assembling spaces115, respectively113. The buckling blocks144are respectively secured in the buckling slots114.

Please refer toFIG. 2andFIG. 4, in which embodiment each of the buckling members14further includes an outer lateral side145and a contact region146. The contact region146is disposed at the outer lateral side145. After the buckling members14are respectively assembled in the assembling spaces115and the metal shell12is provided to enclose the insulation housing11, the inner lateral wall of the metal shell12is connected to the contact regions146, so that laser soldering is applied to combine the metal shell12with the contact regions146; alternatively, each of contact regions146is formed as a protruded structure to contact the inner lateral wall of the metal shell12; optionally, the inner lateral wall of the metal shell12includes a plurality of protruded structures contacted with the contact regions146, respectively.

Please refer toFIG. 4andFIG. 5; in which embodiment each of the buckling members14includes a bending portion147connected between the arm portion141and the soldering portion143. The arm portion141and the soldering portion143are not at the same plane; that is, the soldering portions143are respectively aligned to match with the grounding contacts131of the circuit board13by the application of the bending portions147.

Please refer toFIGS. 7 and 7A, in which the electrical receptacle connector200of the embodiment of the disclosure is illustrated. The electrical receptacle connector200is a USB type-C interface. Please refer toFIG. 1toFIG. 3, in which the electrical receptacle connector200is provided to connect with the electrical plug connector100. The electrical receptacle connector200includes an insulation housing21, a plurality of upper-row and lower-row plate terminals28and29, and a grounding sheet22; and, a metal shell26is provided to enclose the insulation housing21.

The metal shell26is hollowed and has a receiving cavity261therein. In this embodiment, the metal shell26is formed by, for example, a unitary or multi-piece member. Furthermore, the metal shell26defines an opening at one side thereof; the opening is formed in the shape of, for example, oblong or rectangular and communicates with the receptacle cavity261of the metal shell26.

Please refer toFIG. 3andFIG. 7; in which the insulation housing21is received in the receiving cavity261and insulation housing includes a base portion211and a tongue portion212. Here, the base portion211and the tongue portion212are formed by insert-molding techniques, and the tongue portion212is extended from one side of the base portion211. Furthermore, the tongue portion212has an upper surface212aand a lower surface212b.

The receptacle terminals27are disposed at the base portion211and the tongue portion212. The receptacle terminals27include a plurality of upper-row plate terminals28and a plurality of lower-row plate terminals29.

Please refer toFIG. 7A,FIG. 7B,FIG. 7CandFIG. 7D; in which the upper-row plate terminals28are disposed at the base portion211and the tongue portion212. Here, the upper-row plate terminals28includes a plurality of upper-row plate signal terminals281, at least one upper-row plate power-supply terminal282and at least one upper-row plate ground terminal283. Each of the upper-row plate terminals281is disposed at the base portion211and the tongue portion212and located at the upper surface212aof the tongue portion212. Referring toFIG. 7D, the upper-row plate terminals28include, from left to right, an upper-row plate ground terminal283(Gnd), a first pair of differential signal terminals (TX1+−), a second pair of differential signal terminals (D+−), and a third pair of differential signal terminals (RX2+−) of the upper-row plate signal terminals281, upper-row plate power-supply terminals282(Power/VBUS) between the three pairs of differential signal terminals, a retain terminal (RFU), (the retain terminal and a configuration channel 1 (CC1) are respectively arranged between the upper-row plate power-supply terminals282and the second pair of differential signal terminals of the upper-row plate signal terminals281), and another upper-row plate ground terminal283(Gnd).

Please refer toFIG. 7A,FIG. 7B,FIG. 7CandFIG. 7D; in which each of the upper-row plate terminals28includes an upper-row contact section284, an upper-row connecting section285and an upper-row soldering section286. The upper-row connecting section285is disposed at the base portion211and the tongue portion212. The upper-row contact section284is extended from one of two ends of the upper-row connecting section285and disposed at the upper surface212aof the tongue portion212, the upper-row soldering section286is extended from the other end of the upper-row connecting section2855and extended out of the base portion211. The upper-row plate signal terminals281are disposed at the upper surface212aand transmitting first signals (that is, USB 3.0 signals). And, the upper-row soldering section286is extended out of a bottom of the base portion211. Furthermore, the upper-row soldering section286is bent horizontally to form horizontal soldering portions (SMT pins).

Please refer toFIG. 7A,FIG. 7B,FIG. 7CandFIG. 7Dagain; in which the lower-row plate terminals29are disposed at the base portion211and the tongue portion212. Here, the lower-row plate terminals29includes a plurality of lower-row plate signal terminals291, at least one lower-row plate power-supply terminal292and at least one lower-row plate ground terminal293. Each of the lower-row plate terminals29is disposed at the base portion211and the tongue portion212and located at the lower surface212bof the tongue portion212. Refer toFIG. 7D, the lower-row plate terminals29include, from left to right, a lower-row plate ground terminal293(Gnd), a first pair of differential signal terminals (TX2+−), a second pair of differential signal terminals (D+−), and a third pair of differential signal terminals (RX1+−) of the lower-row plate signal terminals291, lower-row plate power-supply terminals292(Power/VBUS) between the three pairs of differential signal terminals, a retain terminal (RFU), (the retain terminal and a configuration channel 2 (CC2) are respectively arranged between the lower-row plate power-supply terminals292and the second pair of differential signal terminals of the lower-row plate signal terminals291), and another lower-row plate ground terminal293(Gnd).

Please refer toFIG. 7A,FIG. 7B,FIG. 7CandFIG. 7Dagain; in which each of the lower-row plate terminals29includes a lower-row contact section294, a lower-row connecting section295and a lower-row soldering section296. The lower-row connecting section295is disposed at the base portion211and the tongue portion212. The lower-row contact section294is extended from one of two ends of the lower-row connecting section295and disposed at the lower surface212b, and the lower-row soldering section296is extended from the other end of the lower-row connecting section295and extended out of the base portion211. The lower-row plate signal terminals291are disposed at the lower surface212bfor transmitting second signals (that is, USB 3.0 signals). The lower-row soldering section296is extended out of the bottom the base portion211. Furthermore, the lower-row soldering sections296are bent horizontally to be provided as SMT soldering portions, as shown inFIG. 7B.

Please refer toFIG. 7,FIG. 7A,FIG. 7B,FIG. 7CandFIG. 7D, in which embodiment the upper-row plate terminals28and the lower-row plate terminals29are respectively disposed at the upper surface212aand lower surface212bof the tongue portion212. Furthermore, the upper-row plate terminals28and the lower-row plate terminals29are point-symmetrical with a central point of the receiving cavity261as the symmetrical center. Here, point-symmetry means, after the upper-row plate terminals28(or the lower-row plate terminals29) are rotated by 180 degrees with the symmetrical center as the rotating center, the upper-row plate terminals28and the lower-row plate terminals29are overlapped; that is, the rotated upper-row plate terminals28are arranged at the position of the original lower-row plate terminals29, and the rotated lower-row plate terminals29are arranged at the position of the original upper-row plate terminals28. In other words, the upper-row plate terminals28and the lower-row plate terminals29are arranged upside down, and the arrangement sequence of the upper-row plate terminals28are left-right reversal with respect to the arrangement sequence of the lower-row plate terminals29. The electrical plug connector100is inserted into the interior of the electrical receptacle connector200with a forward orientation for transmitting first signals; conversely, the electrical plug connector100is inserted into the interior of the electrical receptacle connector200with a reverse orientation for transmitting second signals. The specification for transmitting the first signals conforms to that for transmitting the second signals. Based on this, the inserting orientation of the electrical plug connector100is not limited, and can be forwarded or reversed, when plugging into the electrical receptacle connector200.

Please refer toFIG. 7A,FIG. 7B,FIG. 7CandFIG. 7Dagain; in which embodiment positions of upper-row plate terminals28correspond to those of the lower-row plate terminals29.

The grounding sheet22is disposed at the insulation housing21. The grounding sheet22includes a main body221, a plurality of buckles222and a plurality of soldering portions223. The main body221, the buckles222and the soldering portions223are connected with each other. The main body221is formed at the insulation housing21. The buckles222are disposed at two sides of the main body221to be exposed out of two sides of the tongue plate211, respectively; that is, the buckles222are protruded from the two sides of the tongue plate211. The buckles222are respectively connected to the hook portions142. Additionally, the soldering portions223are extended to form at a rear portion of the main body221. Here, the soldering portions223are extended downwardly from two lateral portions2211and a rear portion2212of the main body221, respectively. The soldering portions223are exposed out of the insulation housing21to connect to a circuit board23. The soldering portions223are disposed at the rear portion of the main body221and downwardly extended to form the vertical soldering portions (through-hole pins). The circuit board23includes a plurality of grounding contacts231and a plurality of through holes232. The grounding contacts231are disposed at the through holes232, respectively. The soldering portions223are respectively inserted into the through holes232for applying soldering processes, thereby respectively connecting the soldering portions223with the grounding contacts231.

When the electrical plug connector100is inserted into the interior of the electrical receptacle connector200, the hook portions142of the buckling members14of the electrical plug connector100is buckled with the buckles222, thereby avoiding the hook portions142of the electrical plug connector100rubbing against the two sides of the tongue plate211to wear the tongue plate211. Furthermore, the soldering portions223are exposed out of the insulation housing21and connected to the metal shell26, so as to conduct the grounding sheet22for grounding.

Additionally, when the electrical plug connector100is inserted into the interior of the electrical receptacle connector200, the hook portions142of the buckling members14of the electrical plug connector100are respectively connected to the buckles222of the grounding sheet22of the electrical receptacle connector200, as shown inFIG. 3,FIG. 8andFIG. 9. In the electrical plug connector100, the arm portions141of the buckling members14are connected to the metal shell12and the soldering portions143of the buckling member14are connected to the circuit board13; while in the electrical receptacle connector200, the soldering portions223of the grounding sheet22are connected to the circuit board23. Based on this, low-impedance grounding path is provided, and the electromagnetic interference (EMI) and radio frequency interference (RFI) can be improved.

As described previously, in the electrical plug connector of the disclosure, the arm portions are connected to the metal shell, and the soldering portions of the buckling members are connected to one circuit board; while in the electrical receptacle connector of the disclosure, the soldering portions of the grounding sheet are connected to another circuit board. Consequently, low-impedance grounding path can be provided upon the electrical plug connector is connected with the electrical receptacle connector, thereby reducing the EMI and RMI problems. Additionally, the soldering portions of the buckling members are soldered on the circuit board to provide the structural strength of the buckling members. Additionally, because the upper-row terminals and the lower-row terminals are arranged upside down, and the arrangement sequence of the upper-row plate contacts are left-right reversal with respect to the arrangement sequence of the lower-row plate contacts, an electrical plug connector is inserted into the interior of the electrical receptacle connector with the terminals of the electrical plug connector contacting with the upper-row plate contacts when plugged in a forward orientation, and the electrical plug connector is inserted into the interior of the electrical receptacle connector with the terminals of the electrical plug connector contacting with the lower-row plate contacts when plugged in a reverse direction. Consequently, the inserting orientation of the electrical plug connector is not limited.