Patent Publication Number: US-11031725-B2

Title: Electrical receptacle connector

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This non-provisional application claims priority under 35 U.S.C. § 119(a) to Patent Application No. 201910061468.4 filed in China, P.R.C. on Jan. 23, 2019, the entire contents of which are hereby incorporated by reference. 
     FIELD OF THE INVENTION 
     The instant disclosure relates to an electrical connector, and more particular to an electrical receptacle connector. 
     BACKGROUND 
     The transmission interface specifications of the electrical connector are quite diverse, such as HDMI or Universal Serial Bus (USB). The existing USB interconnects have the attributes of plug-and-play and ease of use by end users. The transmission rate of USB 2.0 is insufficient. As a consequence, faster serial bus interfaces such as USB 3.0, are developed, which may provide a higher transmission rate so as to satisfy the need of a variety devices. 
     The appearance, the structure, the contact ways of terminals, the number of terminals, the pitches between terminals (the distances between the terminals), and the pin assignment of terminals of a USB type-C electrical connector known to the inventor(s) are totally different from those of a USB electrical connector known to the inventor(s). A USB type-C electrical plug connector known to the inventor(s) includes a plastic core, upper and lower plug terminals held on the plastic core, an outer iron shell circularly enclosing the plastic core, and conductive sheets held on the plastic core. After the type-c electrical receptacle connector is inserted into and detached from a mating type-c electrical plug connector for a period of time, the debris is easily piled up in the type-c electrical receptacle connector due to the friction between the receptacle terminals and the plug terminals. When the debris is accumulated to a certain extent, the debris may further occupy the space between the adjacent receptacle terminals, resulting in the indirect contact of the adjacent receptacle terminals to cause poor voltage-withstand performance or even cause the short circuit condition. 
     SUMMARY OF THE INVENTION 
     In view of this, an embodiment of the instant disclosure provides an electrical receptacle connector. The electrical receptacle connector comprises an insulated housing, a plurality of receptacle terminals, and a metallic shell. The insulated housing comprises a base portion and a tongue portion. The tongue portion is outwardly extending from one end of the base portion. A coverage region adjacent to the base portion is held on a surface of the tongue portion. The receptacle terminals are held in the base portion and disposed at an upper surface of the tongue portion or a lower surface of the tongue portion. The receptacle terminals comprise a body portion and a contact portion, the body portion is held in the base portion and the tongue portion, and the contact portion is outwardly extending from one end of the body portion and disposed at the upper surface of the tongue portion or the lower surface of the tongue portion. Each of the receptacle terminals comprises an avoidance portion between the contact portion and the body portion. The avoidance portion of each of the receptacle terminals is covered by the coverage region of the tongue portion. The metallic shell comprises a receptacle cavity. The insulated housing is held in the receptacle cavity. 
     In one or some embodiments, when a plurality of plug terminals of an electrical plug connector is in contact with the receptacle terminals of the electrical receptacle connector respectively, the debris is generated on the coverage region of the surface of the tongue portion on the avoidance portions. 
     In one or some embodiments, the electrical plug connector is inserted into and positioned in the electrical receptacle connector, a plurality of contact ends of the plug terminals is adjacent to the coverage region. 
     In one or some embodiments, a thickness of the avoidance portion of each of the receptacle terminals is less than a thickness of the contact portion of each of the receptacle terminals. 
     In one or some embodiments, an end of the avoidance portion of each of the receptacle terminals is in the base portion. 
     In one or some embodiments, a thickness of the base portion is greater than a thickness of the tongue portion. 
     In one or some embodiments, the coverage region covers from an end portion of the contact portion to an end portion of the base portion. 
     In one or some embodiments, a covering range of the coverage region is from one of two sides of the tongue portion to the other side of the tongue portion. 
     In one or some embodiments, the surface of the tongue portion at the coverage region and a surface of each of the contact portions are substantially aligned in a same horizontal plane. 
     In one or some embodiments, the insulated housing further comprises two metal sheets arranged at two sides of the tongue portion. Each of the metal sheets comprises a hook structure protruding from a side of the tongue portion and a through hole adjacent to the hook structure. 
     In one or some embodiments, the electrical receptacle connector further comprises a fixation block. Each of the receptacle terminals is at a position on the fixation block and combined with the insulated housing. 
     In one or some embodiments, a plurality of blocks is outwardly protruding from the fixation block and held with two sides of each of the receptacle terminals. The blocks are received in the through holes, respectively. 
     In one or some embodiments, each of the through holes has an expanded portion extending to the corresponding hook structure. 
     In one or some embodiments, an extension portion and a soldering leg are outwardly extending from two sides of each of the metal sheets. A plurality of blocks is are outwardly protruding from the fixation block and are held with two sides of each of the extension portions. 
     In one or some embodiments, the insulated housing further comprises a metal sheet arranged at two sides of the tongue portion. The metal sheet comprises a plurality of hook structures protruding from a side of the tongue portion and a plurality of through holes respectively adjacent to the hook structures. 
     In one or some embodiments, the electrical receptacle connector further comprises a fixation block. Each of the receptacle terminals is at a position on the fixation block and combined with the insulated housing. 
     In one or some embodiments, a plurality of blocks are outwardly protruding from the fixation block and held with two sides of each of the receptacle terminals. The blocks are received in the through holes, respectively. 
     In one or some embodiments, each of the through holes has an expanded portion extending to the corresponding hook structure. 
     In one or some embodiments, a plurality of extension portions and a plurality of soldering legs are outwardly extending from two sides of the metal sheet, a plurality of blocks is outwardly protruding from the fixation block and is held with two sides of each of the extension portions. 
     An embodiment of the instant disclosure provides the coverage region. When the plug terminals of the electrical plug connector are respectively in contact with the receptacle terminals of the electrical receptacle connector, the debris is produced on the coverage region which is on the avoidance portions of the surfaces of the tongue portion. After the receptacle terminals and the plug terminals are mated with and detached from each other for a period of time, terminals can be prevented from suffering poor voltage-withstand performance or the short circuit condition due to the stacking of the debris. Furthermore, the area of the tongue portion made of plastic covering the receptacle terminals becomes larger (as the coverage area of the coverage region is added), so as to avoid the contact portions of the receptacle terminals of the electrical receptacle connector from warping and protruding on the surfaces of the tongue portion due to processing and high temperature baking procedures. 
     Detailed description of the characteristics and the advantages of the instant disclosure are shown in the following embodiments. The technical content and the implementation of the instant disclosure should be readily apparent to any person skilled in the art from the detailed description, and the purposes and the advantages of the instant disclosure should be readily understood by any person skilled in the art with reference to content, claims, and drawings in the instant disclosure. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The instant disclosure will become more fully understood from the detailed description given herein below for illustration only, and thus not limitative of the instant disclosure, wherein: 
         FIG. 1  illustrates a perspective view of an electrical receptacle connector according to an exemplary embodiment of the instant disclosure; 
         FIG. 2  illustrates an exploded view ( 1 ) of the electrical receptacle connector of the exemplary embodiment; 
         FIG. 3  illustrates an exploded view ( 2 ) of the electrical receptacle connector of the exemplary embodiment; 
         FIG. 4  illustrates an exploded view of a plurality of receptacle terminals of the electrical receptacle connector of the exemplary embodiment; 
         FIG. 5  illustrates a top view of the receptacle terminals of the electrical receptacle connector of the exemplary embodiment; 
         FIG. 6  illustrates a lateral cross-sectional view of the electrical receptacle connector of the exemplary embodiment; 
         FIG. 7  illustrates a perspective cross-sectional view of the electrical receptacle connector of the exemplary embodiment; 
         FIG. 8  illustrates a lateral cross-sectional view of another embodiment of the metallic shell of the electrical receptacle connector of the exemplary embodiment; 
         FIG. 9  illustrates a lateral view showing that an electrical plug connector is mating with the electrical receptacle connector of the exemplary embodiment; 
         FIG. 10  illustrates a perspective view showing that the electrical plug connector is mating with the electrical receptacle connector of the exemplary embodiment; 
         FIG. 11  illustrates a perspective view showing a plurality of contact portions of the receptacle terminals and a tongue portion, according to the electrical receptacle connector of the exemplary embodiment; 
         FIG. 12  illustrates a perspective view of an insulated housing of the electrical receptacle connector of the exemplary embodiment; 
         FIG. 13  illustrates a perspective view showing that each of the grounding plates is buckling with a hook, according to the electrical receptacle connector of the exemplary embodiment; and 
         FIG. 14  illustrates a perspective view of another embodiment of a grounding plate of the electrical receptacle connector of the exemplary embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     Please refer to  FIGS. 1 to 7 , illustrating an electrical receptacle connector  100  according to an exemplary embodiment of the instant disclosure.  FIG. 1  illustrates a front perspective view thereof,  FIG. 2  illustrates a front exploded view ( 1 ) thereof,  FIG. 3  illustrates a back exploded view ( 2 ) thereof,  FIG. 4  illustrates an exploded view of a plurality of receptacle terminals  200  thereof,  FIG. 5  illustrates a top view of the receptacle terminals  200  thereof,  FIG. 6  illustrates a lateral cross-sectional view thereof, and  FIG. 7  illustrates a perspective cross-sectional view thereof. 
     In this embodiment, the electrical receptacle connector  100  provides a USB Type-C connector interface, but embodiments are not limited thereto. In some embodiments, the electrical receptacle connector  100  may provide an HDMI connector interface. In this embodiment, the electrical receptacle connector  100  is a USB Type-C receptacle connector. The electrical receptacle connector  100  comprises an insulated housing  1 , a plurality of receptacle terminals  200 , and a metallic shell  4 . 
     In this embodiment, the insulated housing  1  is an elongated plate, and may be formed by multiple pieces or a single piece of plastic base. In this embodiment, the insulated housing  1  is a single piece. The insulated housing  1  comprises a base portion  11  and a tongue portion  12 . In this embodiment, the base portion  11  and the tongue portion  12  are formed by injection-molding process. The tongue portion  12  is outwardly extending from one side of the base portion  11 . 
     In this embodiment, the receptacle terminals  200  are held in the base portion  11 , and the receptacle terminals  200  are disposed at an upper surface of the tongue portion  12  and/or a lower surface of the tongue portion  12 . 
     In this embodiment, the metallic shell  4  is a hollow shell. The metallic shell  4  comprises a receptacle cavity  41 . The metallic shell  4  covers the insulated housing  1 , that is, the insulated housing  1  is received in the receptacle cavity  41 . The metallic shell  4  has a first end and a second end opposite to the first end. An insertion opening  42  is on the first end of the metallic shell  4 , and the insertion opening  42  is located at the outer peripheral region of the tongue portion  12 . A stopping portion  43  is bending down from an upper plate of the metallic shell  4  toward the surface of the base portion  10 . The stopping portion  43  is extending to the surface of the base portion  11 . 
     In this embodiment, the stopping portion  43  is vertically extending to the surface of the base portion  11 . The insertion space  40  is formed between the surface of the base portion  11  and the inner surface of the metallic shell  4 . An electrical plug connector  9  is inserted to the insertion space  40  through the insertion opening  42  (as shown in  FIG. 9 ). In an electrical receptacle connector known to the inventor(s), the insertion space is not formed between the surface of the base portion and the inner surface of the metallic shell, and the electrical plug connector known to the inventor(s) can be just inserted to the base portion, stopped by the base portion, and failed to be inserted into the insertion space. 
     Please refer to  FIGS. 2, 7, and 9 .  FIG. 9  illustrates a lateral view showing that the electrical plug connector  9  is mating with the electrical receptacle connector  100 . In this embodiment, when the electrical plug connector  9  is inserted into the receptacle cavity  41 , the end portion  9   a  of the electrical plug connector  9  is in contact with the stopping portion  43 . The metallic shell  4  (made of iron material) is in contact with the electrical plug connector  9 . When the electrical plug connector  9  is completely inserted into the receptacle cavity  41 , the insertion force can be dispersed over the metallic shell  4  to avoid the insulated housing  1  from being impacted by the electrical plug connector  9 , thereby ensuring the receptacle terminals  200  held in the insulated housing  1  from being squeezed or deformed. Hence, the problem of the receptacle terminals held in the insulated housing are squeezed or deformed in the case that the insulated housing (made of plastic material) is used as the stop of the electrical plug connector known to the inventor(s) when the insulated housing is impacted, can be solved. 
     In other words, the stopping portion  43  (or the stopping surface) of the electrical receptacle connector  100  in this embodiment is replaced, from the insulated housing  1  (made of plastic material) known to the inventor(s) by the metallic shell  4  (made of iron material) according to one or some embodiments of the instant disclosure. In this embodiment, the electrical plug connector  9  comprises an insulating body  91  and a shell  94  covering the insulating body  91 . The end portion  9   a  of the insulating body  9  and the end portion  9   a  of the shell  94  are adapted to be in contact with the stopping portion  43 . 
     In this embodiment, the second end of the metallic shell  4  comprises an extension portion  44  extending outwardly from an end of the stopping portion  43 . The extension portion  44  is abutted against the surface of the base portion  11 . The stopping portion  43  and the extension portion  44  are substantially vertical to each other. Furthermore, the extension portion  44  on the second end of the metallic shell  4  is a shrunken frame structure  45 . An inner diameter of the shrunken frame structure  45  is less than an inner diameter of the insertion opening  42 , thereby configuring the metallic shell  4  with two end openings in different sizes. 
     Please refer to  FIGS. 1 and 8 .  FIG. 8  illustrates a lateral cross-sectional view of another embodiment of the metallic shell  4 . In this embodiment, the tongue portion  12  is exposed out of the insertion opening  42 , but embodiments are not limited thereto. In some embodiments, the tongue portion  12  may be in the receptacle cavity  41 . In other words, the length of the metallic shell  4  may be shortened to expose the tongue portion  12 , or the length of the metallic shell  4  may be extended, so that the tongue portion  12  can be received in the receptacle cavity  41 . Because the metallic shell  4  may be changed in different lengths, the electrical plug connector  9  can be applied to different specifications (one specification of an electrical plug connector is shown in  FIG. 9 ); alternatively, according to electronic products with different assembling requirements, the metallic shell  4  with different lengths can be utilized. 
     In this embodiment, the electrical receptacle connector  100  further comprises a cover  6  covering the metallic shell  4 . In this embodiment, the cover  6  and the metallic shell  4  are separated elements, but embodiments are not limited thereto. In some embodiments, the cover  6  and the metallic shell  4  are a one-piece member. 
     In this embodiment, the receptacle terminals  200  comprises a plurality of first terminals  2 . The first terminals  2  are held in the base portion  11  and the tongue portion  12 . In this embodiment, the first terminals  2  comprises a plurality of first signal terminals  21 , at least one first power terminal  22 , and at least one first ground terminal  23 . The first terminals  2  are held in the base portion  11 , and disposed at an upper surface of the tongue portion  12 . 
     In this embodiment, from a front view of the first terminals  2 , the first terminals  2  comprise, from left to right, a first ground terminal  23  (Gnd), a first power terminal  22  (Power/VBUS), a pair of first signal terminals  21  (D+−, differential signal terminals), a reserved terminal (RFU), and another first ground terminal  23  (Gnd), but embodiments are not limited thereto. 
     In one embodiment, from a front view of the first terminals  2 , the first terminals  2  comprise, from left to right, a first ground terminal  23  (Gnd), a first pair first signal terminals  21  (TX1+−, differential signal terminals), a second pair first signal terminals  21  (D+−, differential signal terminals), a third pair first signal terminals  21  (RX2+−, differential signal terminals), and a first power terminal  22  (Power/VBUS), a reserved terminal (RFU), and another first ground terminal  23  (Gnd) between three pairs of first signal terminals  21 . The provided specification is for USB 3.0 signal transmission. 
     Each of the first terminals  2  comprises a first contact portion  24 , a first body portion  25 , and a first tail portion  26 . The first body portions  25  are held in the base portion  11  and the tongue portion  12 . The first contact portions  24  are extending forward from the first body portions  25  and disposed at the upper surface of the tongue portion  12 . The first tail portions  26  are extending backward from the first body portions  25  and protruding out of the base portion  11 . The first signal terminals  21  are disposed at the upper surface of the tongue portion  12  for transmitting first signals (i.e., USB 2.0 signals). The first tail portions  26  are protruding out of the back of the base portion  11 , and may be bent horizontally to form flat legs, named legs manufactured by SMT (surface mounted technology). Alternatively, the first tail portions  26  may be extending downwardly to form vertical legs, named legs manufactured by through-hole technology. 
     In this embodiment, the receptacle terminals  200  comprises a plurality of second terminals  3 . The second terminals  3  are held in the base portion  11  and the tongue portion  12 . In this embodiment, the second terminals  3  comprises a plurality of second signal terminals  31 , at least one second power terminal  32 , and at least one second ground terminal  33 . The second terminals  3  are held in the base portion  11 , and disposed at a lower surface of the tongue portion  12 . 
     In this embodiment, from a front view of the second terminals  3 , the second terminals  3  comprise, from right to left, a second ground terminal  33  (Gnd), a second power terminal  32  (Power/VBUS), a pair of second signal terminals  31  (D+−, differential signal terminals), a reserved terminal (RFU), and another second ground terminal  33  (Gnd), but embodiments are not limited thereto. 
     In one embodiment, from a front view of the second terminals  3 , the second terminals  3  comprise, from right to left, a second ground terminal  33  (Gnd), a second pair second signal terminals  31  (TX2+−, differential signal terminals), a second pair second signal terminals  31  (D+−, differential signal terminals), a third pair second signal terminals  31  (RX1+−, differential signal terminals), and a second power terminal  32  (Power/VBUS), a reserved terminal (RFU), and another second ground terminal  33  (Gnd) between three pairs of second signal terminals  31 . The provided specification for USB 3.0 signal transmission. 
     Each of the second terminals  3  comprises a second contact portion  34 , a second body portion  35 , and a second tail portion  36 . The second body portions  35  are held in the base portion  11  and the tongue portion  12 . The second contact portions  34  are extending forward from the second body portions  35  and disposed at the lower surface of the tongue portion. The second tail portions  36  are extending backward from the second body portions  35  and protruding out of the base portion  11 . The second signal terminals  31  are disposed at the lower surface of the tongue portion for transmitting second signals (i.e., USB 2.0 signals). The second tail portions  36  are protruding out of the back of the base portion  11 , and may be bent horizontally to form flat legs, named legs manufactured by SMT (surface mounted technology). Alternatively, the second tail portions  36  may be extending downwardly to form vertical legs, named legs manufactured by through-hole technology. 
     In this embodiment, the first terminals  2  and the second terminals  3  are respectively held on the upper surface of the tongue portion  12  and the lower surface of the tongue portion  12 . Moreover, pin-assignments of the first terminals  2  and the second terminals  3  are point-symmetrical with a central point of the receptacle cavity  41  as the symmetrical center. In other words, pin-assignments of the first terminals  2  and the second terminals  3  have 180-degree symmetrical design with respect to the central point of the receptacle cavity  41  as the symmetrical center. Here, point-symmetry means that after the first terminals  2  (or the second terminals  3 ), are rotated by 180 degrees with the symmetrical center as the rotating center, the first terminals  2  and the second terminals  3  are overlapped. That is, the rotated first terminals  2  are arranged at the position of the original second terminals  3 , and the rotated second terminals  3  are arranged at the position of the original first terminals  2 . 
     In other words, the first terminals  2  and the second terminals  3  are upside-down, and pin-assignments of the first contact portions  24  is left-right reversal with respect to that of the second contact portions  34 . Therefore, the electrical plug connector  9  may be inserted into the electrical receptacle connector  100  with a first orientation for transmitting first signals. Conversely, the electrical plug connector  9  may also be inserted into the electrical receptacle connector  100  with a second orientation for transmitting second signals. Furthermore, the specification for transmitting the first signals is conformed to the specification for transmitting the second signals. Note that, the inserting orientation of the electrical plug connector  9  is not limited by the electrical receptacle connector  100 . 
     In this embodiment, from a front view of the first terminals  2  and the second terminals  3 , the positions of the first terminals  2  correspond to the positions of the second terminals  3 . 
     Please refer to  FIGS. 2, 4, 6, 7, and 9 to 12 .  FIG. 10  illustrates a perspective view showing that the electrical plug connector  9  is mating with the electrical receptacle connector  100 . In  FIG. 10 , the electrical plug connector  9  is cut off in half.  FIG. 11  illustrates a perspective view showing that the tongue portion is mating with the plug terminals  92 .  FIG. 12  illustrates a perspective view of the insulated housing  1 . 
     In this embodiment, the surface of the tongue portion  12  comprises an entire row coverage region (hereinafter, coverage region  13 ) adjacent to the base portion  11 . The thickness of the base portion  11  is slightly greater than the thickness of the tongue portion  12 . The coverage region  13  is on the tongue portion  12  adjacent to the base portion  10 . In this embodiment, the coverage area of the coverage region  13  is extending from one of two sides of the tongue portion  12  to the other side of the tongue portion  12 . That is, the coverage region  13  is fully configured on the inner surface of the tongue portion  12 . The coverage region  13  is formed on the inner surface of the tongue portion  12  and devoid of the first contact portions  24  and the second contact portions  34  (the first contact portions  24  and the second contact portions  34  are the contact portions). The coverage region  13  is not the contact area of the plug terminals  92  the electrical plug connector  9 . The surface of the tongue portion  12  at the coverage region  13  and the surface of the contact portions  24 ,  34  are substantially aligned in a same horizontal plane. 
     In this embodiment, the receptacle terminals  200  comprise the body portions (the first body portions  25  or the second body portions  35 ) held in the base portion  11  and the tongue portion  12 , and the contact portions (the first contact portions  24  or the second contact portions  34 ) extending from one end of the body portions and held in the upper surface and the lower surface of the tongue portion  12 . Each of the receptacle terminals  200  comprises the avoidance portions  29 ,  39  between the contact portions and the body portions (as shown in  FIG. 4 ). 
     In this embodiment, the thickness of each of the avoidance portions  29 ,  39  of the receptacle terminals  200  is less than the thickness of each of the contact portions (the first contact portions  24  or the second contact portions  34 ) of the receptacle terminals  200 . Furthermore, each of the avoidance portions  29 ,  39  is held between the tongue portion  12  and the base portion  11  (as shown in  FIG. 8 ). The avoidance portions  29 ,  39  of each of the receptacle terminals  200  are covered with the coverage region  13  of the tongue portion  12 . In this embodiment, the thickness of the base portion  11  is slightly greater than the thickness of the tongue portion  12 . One end of each of the avoidance portions  29 ,  39  of each of the receptacle terminals  200  is in the base portion  11 . 
     In this embodiment, the space provided by the avoidance portions  29  of the first ground terminals  23  and the first power terminals  22  is greater than the space provided by the avoidance portions  29  of the first signal terminals  21 . That is, the width of the first ground terminals  23  and the first power terminals  22  becomes larger at the avoidance portions  29 . The width of the first contact portions  24  of the first signal terminals  21  is the same as the width of avoidance portions  29 . Furthermore, the design of each of the second terminals  3  is the same. 
     In this embodiment, when the plug terminals  92  of the electrical plug connector  9  are in contact with the receptacle terminals  200  of the electrical receptacle connector  100 , debris  99  is produced on the avoidance portions  29 ,  39  of the upper and lower surfaces of the tongue portion  12  (in  FIG. 11 , only the upper surface of the tongue portion  12  is shown) due to friction of metals. 
     In particular, when the receptacle terminals  200  are frictionally in contact with the plug terminals  92 , the debris  99  is easily piled up at the area between the tongue portion  12  and the base portion  11 . Therefore, when the insulated housing  1  is formed by thinning the thickness of the avoidance portions  29 ,  39  of the receptacle terminals  200 , the tongue portion  12  made of plastic is covered on each of the avoidance portions  29 ,  39 . Accordingly, the debris  99  is on the coverage region  13 . 
     Hence, with such arrangement, after the electrical receptacle terminals  200  and the electrical plug terminals  92  are mated with and detached from each other for a period of time, terminals with different properties (adjacent plug terminals  92 , receptacle terminals  200 , or plug terminals  92  and receptacle terminals  200 ) can be prevented from suffering poor voltage-withstand performance or being conducted with each other to cause the short circuit condition due to the stacking of the debris  99 . 
     The area of the tongue portion  12  made of plastic covering the receptacle terminals  200  becomes larger (the coverage area of the coverage region  13  is added), so as to avoid the contact portions (the first contact portions  24  or the second contact portions  34 ) of the receptacle terminals  200  of the electrical receptacle connector  100  from warping and protruding on the surfaces of the tongue portion  12  due to processing and high temperature baking procedures. 
     In the connector known to the inventor(s), the contact portions of the receptacle terminals known to the inventor(s) are held in the area of the whole tongue portion (without having the coverage area of the coverage region). The plastic tongue portion is formed on the contact portions of the receptacle terminals. After the thermal expansion and cold shrinkage in the processing procedure, small terminal slots are formed between the plastic (tongue portion) and the metal (terminals). When conductive particles or water enter into the terminal slots, the adjacent receptacle terminals may suffer poor voltage-withstand performance or may be in contact with each other to cause the short circuit condition. In this embodiment, the coverage area of coverage region  13  is added to avoid that conductive particles or water enter into the terminal slots to cause poor voltage-withstand performance or to have the adjacent receptacle terminals  200  contacting with each other to cause the short circuit condition. Furthermore, during the process of injection molding, since the connector is devoid of terminal slot, the flow of the injected plastic material is not blocked. Hence, it is effectively to improve the phenomenon of insufficient molding during the molding process and to increase the strength of the product(s) having the electrical receptacle connector  100 . 
     In this embodiment, the electrical receptacle connector  100  further comprises a fixation block  15  (as shown in  FIGS. 2 and 4 ). The fixation block  15  is arranged with the comb port holes. In the insert-molding process, when the insulated housing  1  is combined with each of the receptacle terminals  200  and the fixation block  15 , the plastic material is overflowed through each of the comb port holes, so that the plastic material may be distributed over the mold quickly, and the plastic material can form the shape of the insulated housing  1 , thereby shortening the time of molding process. In the injection molding process, the coverage region  13  is devoid of the comb port holes to avoid the comb port holes from blocking the flow of the plastic material. Accordingly, it is effectively to improve the phenomenon of insufficient molding during the molding process, and to increase the strength of the electrical receptacle connector  100  products. 
     In this embodiment, each of the receptacle terminals  200  is placed on the fixation block  15  and combined with the insulated housing  1 . In this embodiment, each of the grounding plates  7  is fixed on the fixation block  15 , and each of the receptacle terminals  200  is placed on the fixation block  15  in a first molding processing procedure. The insulated housing  1  is molding out of each of the receptacle terminals  200  and the fixation block  15  in a second molding processing procedure. 
     In other words, after the type-c electrical receptacle connector  100  is inserted into and detached from a mating connector for a period of time, the debris  99  is easily piled up at the inner surface area of the tongue portion  12  of the insulated housing  1  due to the friction between the receptacle terminals  200  and the plug terminals  92 . When the debris  99  is accumulated to a certain extent, the debris  99  may further occupy the space between the adjacent receptacle terminals  200 , resulting in the contact of the adjacent receptacle terminals  200  to cause poor voltage-withstand performance or even cause the short circuit condition. 
     In this embodiment, the electrical plug connector  9  is inserted into the electrical receptacle connector  100  and held in a defined position. The contact ends  923  of the plug terminals  92  are adjacent to the coverage region  13  and keep a predetermined distance from the coverage region  13 . After the electrical receptacle connector  100  is inserted into or detached from the electrical plug connector  9  for a period of time, the debris  99  is pushed to the coverage region  13  by the contact ends  923 . 
     Please refer to  FIGS. 1, 2, 4, 5, 12, and 13 .  FIG. 13  illustrates a perspective view showing that each of the grounding plates  7  is buckling with a hook  95 . In this embodiment, the electrical receptacle connector  100  comprises a plurality of grounding plates  7 . In the case that a plurality of grounding plates  7  is provided, each of the grounding plates  7  is held in the insulated housing  1 . Each of the grounding plates  7  respectively comprises a hook structure  71  protruding out of the two ends of the tongue portion  12  and a plurality of through holes  72  adjacent to each of the hook structures  71 . 
     The number of the grounding plates  7  is not limited to embodiments of the instant disclosure. In some embodiments, the grounding plates  7  may be a one-piece structure, as a single grounding plate  7  (as shown in  FIG. 14 ). In the case that a single grounding plate  7  is provided, the grounding plate  7  is held in the insulated housing  1 . The two ends of the grounding plate  7  comprise a hook structure  71  protruding out of the two ends of the tongue portion  12  and a plurality of through holes  72  adjacent to each of the hook structures  71 . 
     In the case that a single grounding plate  7  is provided, the grounding plate  7  is between the first terminals  2  and the second terminals  3 . The grounding plate  7  is formed on the insulated housing  1  and is between the first contact portions  24  and the second contact portions  34 . Specifically, the grounding plate  7  may be lengthened and widened, so that the front of the grounding plate  7  is near a front lateral surface of the tongue portion  12 , two sides of the grounding plate  7  are near two sides of the tongue portion  12  for contacting the electrical plug connector  9 , and the rear of the grounding plate  7  is near the rear of the tongue portion  12 . Accordingly, the grounding plate  7  can be disposed on the tongue portion  12  and the base portion  11 , and the structural strength of the tongue portion  12  and the shielding performance of the tongue portion  12  can be improved. That is, in this embodiment, the crosstalk interference can be reduced by the shielding of the grounding plate  7  when the first and second contact portions  24 ,  34  transmit signals. Furthermore, the structural strength of the tongue portion  12  can be improved by the assembly of the grounding plate  7 . 
     In this embodiment, the hook structures  71  are respectively formed on the outside of each of the grounding plates  7 . Each of the hook structures  71  is protruding out of the both sides of the front end of the tongue portion  12 . When the electrical plug connector  9  is inserted in the electrical receptacle connector  100 , the hooks  95  at both sides of the electrical plug connector  9  respectively buckle with each of the hook structures  71 , and the hooks  95  at two sides of the electrical plug connector  9  would not wear against the tongue portion  12  of the electrical receptacle connector  100 . 
     In this embodiment, a plurality of blocks  151  is outwardly protruding out of the fixation block  15  and is held with two sides of each of the receptacle terminals  200 , respectively, and positioning slots are formed between each of the blocks  151  for positioning the receptacle terminals  200 . Furthermore, part of the blocks  151  may be held in each of the through holes  72 . 
     In this embodiment, an expansion portion  721  is formed in each of the through holes  72  and the expansion portion  721  is extending toward the hook structure  71 , thereby increasing the space of each of the through holes  72  and increasing the area for plastic molding in the expanding portion  721 . Furthermore, the blocks  151  are respectively in the position of the through holes  72  and the expanding portions  721  (as shown in  FIG. 5 ). The blocks  151  are held between the both sides of the front end of the receptacle terminals  200 . 
     In this embodiment, the two sides of the grounding plate  7  extend outwards with an extending portion  74  and legs  75 . The blocks  151  are outwardly protruding out of the fixation block  15  and are held with two sides of each of the receptacle terminals  200 , respectively, thereby improving the limiting of the receptacle terminals  200  in different parts, and improving the fixation of the receptacle terminals  200  on the fixation block  15 . In addition, the legs  75  are protruding out of the back of the base portion  10  and soldered with the circuit board, so that the grounding plate  7  is provided for grounding and conduction. 
     In this embodiment, each of the grounding plates  7  comprises a contact arm  711  formed at the outside of each of the through holes  72 . Furthermore, a buckle recess  712  is formed at the outer surface of each of the contact arms  711 . When the electrical plug connector  9  is inserted in the electrical receptacle connector  100 , the hooks  95  on both sides of the electrical plug connector  9  are buckling with the buckle recesses  712 . While the electrical plug connector  9  is inserted into or detached from the electrical receptacle connector  100 , the hooks  95  are in contact with the contact arms  711 . The contact arms  711  move into the through holes  72 , and the contact arms  711  swing elastically. 
     In other words, after the grounding plates  7  are provided with the through holes  72 , the hook structure  71  forms a hollow elastic structure. Therefore, when the electrical plug connector  9  is mated with the electrical receptacle connector  100 , the hooks  95  on both sides of the electrical plug connector  9  are in contact with the hook structures  71 , and the contact arms  711  of the hook structures  71  swing inwardly to the through holes  72  in an elastic manner. Hence, it is to avoid that when the electrical plug connector  9  is mated with the electrical receptacle connector  100 , the hooks  95  on both sides of the electrical plug connector  9  are in contact with the hook structures  71  in a poor interference manner, resulting in the abrasion of the hooks  95  on both sides of the electrical plug connector  9 , thereby introducing problems of structural damage of the connector and poor contact between the terminals. 
     While the instant disclosure has been described by the way of example and in terms of the preferred embodiments, it is to be understood that the invention need not be limited to the disclosed embodiments. On the contrary, it is intended to cover various modifications and similar arrangements included within the spirit and scope of the appended claims, the scope of which should be accorded the broadest interpretation so as to encompass all such modifications and similar structures.