Patent Publication Number: US-11043763-B2

Title: Electrical connector and electrical connector assembly for connection to a circuit board with zero insertion force

Description:
CROSS-REFERENCE TO RELATED PATENT APPLICATION 
     This non-provisional application claims priority to and the benefit of, pursuant to 35 U.S.C. § 119(a), patent application Serial No. CN201910373636.3 filed in China on May 7, 2019. The disclosure of the above application is incorporated herein in its entirety by reference. 
     Some references, which may include patents, patent applications and various publications, are cited and discussed in the description of this disclosure. The citation and/or discussion of such references is provided merely to clarify the description of the present disclosure and is not an admission that any such reference is “prior art” to the disclosure described herein. All references cited and discussed in this specification are incorporated herein by reference in their entireties and to the same extent as if each reference were individually incorporated by reference. 
     FIELD 
     The present invention relates to an electrical connector and an electrical connector assembly, and particularly to an electrical connector and an electrical connector assembly having zero insertion force. 
     BACKGROUND 
     The background description provided herein is for the purpose of generally presenting the context of the disclosure. Work of the presently named inventors, to the extent it is described in this background section, as well as aspects of the description that may not otherwise qualify as prior art at the time of filing, are neither expressly nor impliedly admitted as prior art against the present disclosure. 
     Chinese Patent No. CN200720193759.1 discloses an electrical connector with zero insertion force. The electrical connector is configured to electrically connect an electronic assembly to a circuit board. The electronic assembly includes a plurality of pins. The electrical connector includes a seat and a plurality of electrical connector terminals. The seat has a plurality of terminal holes running therethrough, and each electrical connector terminal is correspondingly accommodated in each terminal hole. Each electrical connector terminal has a base. Two elastic arms bend upward and extend from a left side and a right side of the base. A space between the two elastic arms forms a zero insertion force type insertion space in a vertical direction downward from top thereof. The upper ends of the two elastic arms respectively form two guide portions and two contact portions relative to the insertion space. The two guide portions extend horizontally outward, and extend obliquely to approach each other. The two contact portions are respectively connected to the extending tail ends of the two guide portions, and extend horizontally and toward a direction away from the insertion space. A clamping space is formed between the two contact portions to clamp a corresponding pin. Each of the pins is placed in the insertion space downward from top thereof with a zero insertion force, and is guided by the two guide portions into the clamping space. 
     However, after the corresponding pin enter the clamping space, each pin maintains a certain distance from the base of an adjacent front electrical connector terminal along a front-rear direction, such that a distance between the two adjacent electrical connector terminals in the front-rear direction is large, which is not consistent with a development trend of dense arrangement of the electrical connector terminals. 
     Therefore, a heretofore unaddressed need to design an electrical connector and an electrical connector assembly exists in the art to address the aforementioned deficiencies and inadequacies. 
     SUMMARY 
     The present invention is directed to an electrical connector and an electrical connector assembly having a denser terminal arrangement. 
     To achieve the foregoing objective, an electrical connector according to certain embodiments of the present invention adopts the following technical solutions. 
     An electrical connector is configured to be electrically connected to a mating component having a plurality of insertion portions. The electrical connector includes: a substrate, provided with a plurality of accommodating holes running through the substrate vertically; and a plurality of terminals, correspondingly accommodated in the accommodating holes, wherein each of the terminals has a base, two connecting portions formed by extending upward from the base, two guide portions and two clamping portions, a gap between the two guide portions is greater than a gap between the two clamping portions, the guide portions are respectively connected to the connecting portions, the clamping portions are respectively formed by extending forward from the guide portions, the two clamping portions are configured to clamp a corresponding insertion portion of the insertion portions, wherein after the corresponding insertion portion is inserted downward between the two guide portions, the guide portions guide the corresponding insertion portion to move forward to the clamping portions, a top end of the base is lower than top ends of the clamping portions, an accommodating space is formed right above the base and located behind the guide portions, a height of the accommodating space is between the top ends of the clamping portions and the top end of the base, and when the corresponding insertion portion is jointly clamped by the two clamping portions, a portion of the corresponding insertion portion lower than the top ends of the clamping portions partially protrudes forward from the clamping portions and is accommodated in the accommodating space of an adjacent front terminal. 
     In certain embodiments, the substrate is a circuit board, the base extends downward to form at least one fixing portion fixed to the accommodating hole, at least one leading portion is formed by extending obliquely downward from the fixing portion and protrudes out of the accommodating hole to be soldered to a main circuit board, the base is located outside the substrate, and a front end of each of the clamping portions passes forward beyond the fixing portion. 
     In certain embodiments, two fixing portions are provided, a first through slot is formed between front sides of the two fixing portions, and a second through slot is formed between rear sides of the two fixing portions. 
     In certain embodiments, two leading portions are provided separately, a first opening is formed between front sides of the two leading portions, and a second opening is formed between rear sides of the two leading portions. 
     In certain embodiments, the terminals further comprise a plurality of ground terminals, a lower surface of the substrate has a shielding layer, an inner wall of each of the accommodating holes is insulating, each of the ground terminals is soldered to a main circuit board by a solder, and the solder connects each of the ground terminals and the shielding layer. 
     In certain embodiments, each of the insertion portions is ball-shaped, a distance between the two clamping portions of each of the terminals gradually decreases upward from a bottom thereof, and a position where the two clamping portions clamp the corresponding insertion portion is higher than a virtual horizontal center line of the corresponding insertion portion. 
     Compared with the related art, the electrical connector according to certain embodiments of the present invention has the following beneficial effects: 
     By providing a portion of the corresponding insertion portion lower than the top ends of the clamping portions to protrude forward from the clamping portions and to be accommodated in the accommodating space of an adjacent front terminal, the corresponding insertion portion and an adjacent front terminal may overlap in the vertical direction without the need to keep a distance therebetween in the front-rear direction, thus shortening a distance between the adjacent terminals in the front-rear direction, and making the arrangement of the terminals denser. 
     To achieve the foregoing objective, an electrical connector assembly according to certain embodiments of the present invention adopts the following technical solutions. 
     An electrical connector assembly includes: a mating component, comprising a support plate and a plurality of insertion portions provided on the support plate and protruding downward out of the support plate; and an electrical connector, configured for the insertion portions to insert downward therein, wherein the electrical connector comprises: a substrate, provided with a plurality of accommodating holes running through the substrate vertically; and a plurality of terminals, accommodated in the accommodating holes, wherein each of the terminals has a base and two clamping portions configured to clamp a corresponding insertion portion of the insertion portions, the two clamping portions are located in front of the base, a top end of the base is lower than top ends of the two clamping portions, and when the corresponding insertion portion is jointly clamped by the two clamping portions, a portion of the corresponding insertion portion lower than the top ends of the clamping portions is located right above the base of an adjacent terminal. 
     In certain embodiments, two connecting portions extend upward from the base, two guide portions are respectively formed by extending backward from the two clamping portions to guide the insertion portions to move forward, a distance between the two clamping portions is less than a distance between the two guide portions, the guide portions are connected to the connecting portions, and a front end of each of the clamping portions passes forward beyond the connecting portions. 
     In certain embodiments, each of the insertion portions is ball-shaped and is made of copper. 
     In certain embodiments, the distance between two clamping portions of each of the terminals gradually decreases upward from a bottom thereof, and a position where the two clamping portions clamp the corresponding insertion portion is higher than a virtual horizontal center line of the corresponding insertion portion. 
     In certain embodiments, an upper surface of the support plate has a plurality of soldering regions to be correspondingly soldered with a plurality of conductors of a chip module, and a distance between two adjacent ones of the insertion portions is greater than a distance between two adjacent ones of the conductors. 
     In certain embodiments, the substrate is a circuit board, the base extends downward to form at least one fixing portion fixed to the accommodating hole, at least one leading portion is formed by extending obliquely downward from the fixing portion and protrudes out of the accommodating hole to be soldered to a main circuit board, the base is located outside the substrate, and a front end of each of the clamping portions passes forward beyond the fixing portion. 
     In certain embodiments, two fixing portions are provided, a first opening is formed between front sides of the two fixing portions, and a second opening is formed between rear sides of the two fixing portions. 
     In certain embodiments, two leading portions are provided separately, a first opening is formed between front sides of the two leading portions, and a second opening is formed between rear sides of the two leading portions. 
     In certain embodiments, the terminals further comprise a plurality of ground terminals, each of an upper surface of the substrate and a lower surface of the support plate respectively has a shielding layer, and each of the ground terminals is electrically connected to the shielding layers. 
     In certain embodiments, the support plate is provided with a stopped portion, a stopping portion is located in front of the stopped portion, and the stopping portion stops the stopped portion forward. 
     Compared with the related art, the electrical connector assembly according to certain embodiments of the present invention has the following beneficial effects: 
     By providing a portion of the corresponding insertion portion lower than the top ends of the clamping portions to be located right above the base of an adjacent terminal, the corresponding insertion portion and an adjacent front terminal may overlap in the vertical direction without the need to keep a distance therebetween in the front-rear direction, thus shortening a distance between the adjacent terminals in the front-rear direction, and making the arrangement of the terminals denser. 
     These and other aspects of the present invention will become apparent from the following description of the preferred embodiment taken in conjunction with the following drawings, although variations and modifications therein may be effected without departing from the spirit and scope of the novel concepts of the disclosure. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings illustrate one or more embodiments of the disclosure and together with the written description, serve to explain the principles of the disclosure. Wherever possible, the same reference numbers are used throughout the drawings to refer to the same or like elements of an embodiment, and wherein: 
         FIG. 1  is a perspective view of an electrical connector assembly according to certain embodiments of the present invention when an insertion portion thereof moves to clamping portions. 
         FIG. 2  is an exploded view of  FIG. 1 . 
         FIG. 3  is a horizontal observational view of  FIG. 1 . 
         FIG. 4  is a perspective view of the electrical connector assembly according to certain embodiments of the present invention when an insertion portion is inserted downward between two guide portions and has not moved between two of the clamping portions. 
         FIG. 5  is a top view of an electrical connector according to certain embodiments of the present invention. 
         FIG. 6  is a sectional view of  FIG. 5  along the A-A direction. 
         FIG. 7  is a sectional view of  FIG. 5  along the B-B direction. 
         FIG. 8  is a sectional view of  FIG. 3  along the C-C direction. 
         FIG. 9  is a perspective view of a terminal clamping a corresponding insertion portion according to certain embodiments of the present invention. 
         FIG. 10  is a top view of  FIG. 9 . 
         FIG. 11  is a main view of a terminal according to certain embodiments of the present invention. 
         FIG. 12  is a top view of  FIG. 11 . 
         FIG. 13  is a left view of  FIG. 11 . 
         FIG. 14  is a schematic view of a chip module and a support plate being connected according to certain embodiments of the present invention. 
         FIG. 15  is a schematic view of terminals being soldered to a main circuit board according to certain embodiments of the present invention. 
     
    
    
     DETAILED DESCRIPTION 
     The present invention is more particularly described in the following examples that are intended as illustrative only since numerous modifications and variations therein will be apparent to those skilled in the art. Various embodiments of the invention are now described in detail. Referring to the drawings, like numbers indicate like components throughout the views. As used in the description herein and throughout the claims that follow, the meaning of “a”, “an”, and “the” includes plural reference unless the context clearly dictates otherwise. Also, as used in the description herein and throughout the claims that follow, the meaning of “in” includes “in” and “on” unless the context clearly dictates otherwise. Moreover, titles or subtitles may be used in the specification for the convenience of a reader, which shall have no influence on the scope of the present invention. 
     It will be understood that when an element is referred to as being “on” another element, it can be directly on the other element or intervening elements may be present therebetween. In contrast, when an element is referred to as being “directly on” another element, there are no intervening elements present. As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items. 
     Furthermore, relative terms, such as “lower” or “bottom” and “upper” or “top,” may be used herein to describe one element&#39;s relationship to another element as illustrated in the Figures. It will be understood that relative terms are intended to encompass different orientations of the device in addition to the orientation depicted in the Figures. For example, if the device in one of the figures is turned over, elements described as being on the “lower” side of other elements would then be oriented on “upper” sides of the other elements. The exemplary term “lower”, can therefore, encompasses both an orientation of “lower” and “upper,” depending of the particular orientation of the figure. Similarly, if the device in one of the figures is turned over, elements described as “below” or “beneath” other elements would then be oriented “above” the other elements. The exemplary terms “below” or “beneath” can, therefore, encompass both an orientation of above and below. 
     As used herein, “around”, “about” or “approximately” shall generally mean within 20 percent, preferably within 10 percent, and more preferably within 5 percent of a given value or range. Numerical quantities given herein are approximate, meaning that the term “around”, “about” or “approximately” can be inferred if not expressly stated. 
     As used herein, the terms “comprising”, “including”, “carrying”, “having”, “containing”, “involving”, and the like are to be understood to be open-ended, i.e., to mean including but not limited to. 
     The description will be made as to the embodiments of the present invention in conjunction with the accompanying drawings in  FIGS. 1-15 . In accordance with the purposes of this invention, as embodied and broadly described herein, this invention, in one aspect, relates to an electrical connector and an electrical connector assembly. 
     As shown in  FIGS. 1 to 15 , a front-rear direction is defined as an X-axis, and the arrow of the X-axis points toward the front direction. A left-right direction is defined as a Y-axis, and the arrow of the Y-axis points toward the left direction. A vertical direction is defined as a Z-axis, and the arrow of the Z-axis points toward the upper direction. 
       FIGS. 1 to 15  show an electrical connector assembly according to certain embodiments of the present invention, which is configured to electrically connect a chip module  500  to a main circuit board  800 , and includes a mating component  400  and an electrical connector  300 . The mating component  400  includes a support plate  4  and a plurality of insertion portions  2  provided on the support plate  4  and protruding downward out of a lower surface of the support plate  4 . The insertion portions  2  are ball-shaped and are made of copper. In another embodiment, the insertion portions  2  may also be slender cylinder-shaped, flat plate shaped, or of other shapes. The chip module  500  is supported on an upper surface of the support plate  4 , and the chip module  500  and the support plate  4  are electrically connected to each other. The electrical connector  300  is located on the main circuit board  800 , and includes a substrate  3  and a plurality of terminals  1  accommodated in the substrate  3 . 
     As shown in  FIG. 1 ,  FIG. 2 , and  FIG. 8 , the substrate  3  is a circuit board (which is not limited thereto in other embodiments). A plurality of accommodating holes  31  run through the substrate  3  downward from top thereof. The inner walls of the accommodating holes  31  do not have conductive layers. That is, the inner walls of the accommodating holes  31  are insulating. Cross-sections of the accommodating holes  31  are circular. As shown in  FIG. 7 , the accommodating holes  31  include a plurality of first accommodating holes  311  and a plurality of second accommodating holes  312 . A third shielding layer  33  is plated on an upper surface of the substrate  3 , and the third shielding layer  33  covers upper edges of the second accommodating holes  312 . The upper surface of the substrate  3  has a plurality of insulating regions  32 , and each of the insulating regions  32  is provided around a corresponding one of the first accommodating holes  311  and located between the corresponding one of the first accommodating holes  311  and the third shielding layer  33 , such that the first accommodating holes  311  are separated from the third shielding layer  33 . A lower surface the substrate  3  has a fourth shielding layer  34 . The fourth shielding layer  34  covers lower edges of the second accommodating holes  312 , and there are intervals between the fourth shielding layer  34  and each of lower edges of the first accommodating holes  311 . 
     As shown in  FIG. 9 ,  FIG. 10 , and  FIG. 13 , each terminal  1  has a base  13 , which is ring-shaped, and a notch  16  is formed in a front side of the base  13 . Two connecting portions  14  extend upward from the base  13 . The terminal  1  further has two guide portions  12  and two clamping portions  11 . The guide portions  12  are connected to the connecting portions  14 , and the clamping portions  11  are formed by extending forward from the guide portions  12 . The two clamping portions  11  are configured to clamp a corresponding insertion portion  2 . A distance between the two guide portions  12  is greater than a distance between the two clamping portions  11 , such that the distance between the two guide portions  12  is greater than a diameter of the insertion portion  2 , thereby facilitating the insertion portion  2  to insert downward between the two guide portions  12  with zero insertion force, and then the guide portions  12  guide the insertion portion  2  to horizontally move to the clamping portions  11  (as shown in  FIG. 4 ,  FIG. 11  and  FIG. 12 ). As shown in  FIG. 3  and  FIG. 11 , along a upward direction from bottom thereof, the connecting portions  14  expand outward (and in other embodiments, only a portion of the connecting portions  14  may expand outward), and the guide portions  12  incline inward. That is, a distance between the two connecting portions  14  gradually increases upward from bottom thereof, and a distance between the two guide portions  12  gradually decreases upward from bottom thereof, such that the distance between the two clamping portions  11  gradually decreases upward from bottom thereof, and as shown in  FIG. 3  and  FIG. 6 , a position P where the clamping portions  11  clamp the insertion portion  2  is higher than a virtual horizontal center line L of the insertion portion  2 . When the insertion portion  2  is clamped by the clamping portions  11 , if the position P where the clamping portions  11  clamp the insertion portion  2  is lower than the virtual horizontal center line L of the insertion portion  2 , the insertion portion  2  is pushed by an upward pushing force of the clamping portions  11 , thereby causing the chip module  500  to move upward. Therefore, in this embodiment, the position P where the clamping portions  11  clamp the insertion portion  2  is higher than the virtual horizontal center line L of the insertion portion  2 , such that the clamping portions  11  form a downward pressure to the insertion portion  2 , thereby avoiding upward movement of the chip module  500  due to an upward pushing force applied to the insertion portion  2 . An accommodating space  15  is provided right above the base  13 , and the accommodating space  15  is located behind the guide portions  12 . As shown in  FIG. 3 , when the insertion portion  2  is clamped by the clamping portions  11 , a portion of the insertion portion  2  lower than the top ends of the clamping portions  11  protrudes forward from the clamping portions  11  and is accommodated in the accommodating space  15  of an adjacent terminal  1 . That is, the portion of the insertion portion  2  lower than the top ends of the clamping portions  11  is located right above the base  13 . 
     As shown in  FIG. 7 ,  FIG. 8  and  FIG. 9 , the base  13  is located outside the corresponding accommodating hole  31 , and two fixing portions  17  extend downward from the base  13 . (In another embodiment, there may be only one fixing portion  17 .) The front ends of the clamping portions  11  pass forward beyond the fixing portions  17 . As shown in  FIG. 7 , the fixing portions  17  and a corresponding accommodating hole  31  are in interference fit to fix the terminal  1  to the corresponding accommodating hole  31 . As shown in  FIG. 8 , the surfaces of the fixing portions  17  are arc surfaces matching the inner wall of the corresponding accommodating hole  31 , such that the fixing portions  17  and the inner wall of the accommodating hole  31  have a larger contact surface area, and the terminal  1  is more firmly fixed to the substrate  3 . A first through slot  1   a  is formed between the front sides of the two fixing portions  17 , and a second through slot  1   b  is formed between the rear sides of the two fixing portions  17 . A protruding portion  171  protrudes from the front side of each of the fixing portions  17  toward the first through slot  1   a , and the two protruding portions  171  of each of the terminals  1  extend toward each other. 
     As shown in  FIG. 7 ,  FIG. 8  and  FIG. 9 , each terminal  1  further has two leading portions  18  provided separately (in other embodiments, thereby may be only one leading portion  18 ). The leading portions  18  extend obliquely downward from the fixing portions  17  to guide the terminal  1  to be inserted into the corresponding accommodating hole  31 . A portion of each leading portion  18  is located in the corresponding accommodating hole  31 , and another portion of each leading portion  18  protrudes from the corresponding accommodating hole  31  to be soldered to the main circuit board  800 . A first opening  1   c  is formed between the front sides of the two leading portions  18 , and a second opening  1   d  is formed between the rear sides of the two leading portions  18 . The first through slot  1   a , the second through slot  1   b , the first opening  1   c , and the second opening  1   d  may reduce a cross-sectional area of the terminal  1 , increase a characteristic impedance, and improve a high frequency. 
     As shown in  FIG. 5  and  FIG. 7 , the terminals  1  includes a plurality of signal terminals  200  correspondingly accommodated in the first accommodating holes  311  and a plurality of ground terminals  100  correspondingly accommodated in the second accommodating holes  312 . The signal terminals  200  are not conductively connected with the third shielding layer  33  and the fourth shielding layer  34 . Because the third shielding layer  33  covers the upper edges of the second accommodating holes  312 , the fixing portions  17  of the ground terminals  100  are closely attached to upper edges of the correspondingly second accommodating holes  312 , such that the ground terminals  100  and the third shielding layer  33  are in contact and are electrically connected. As shown in  FIG. 15 , the leading portions  18  of the ground terminals  100  are partially located in the correspondingly second accommodating holes  312 , such that there are intervals between the leading portions  18  and lower edges of the second accommodating holes  312 . When the leading portions  18  are soldered to the main circuit board  800  by solders  700 , each solder  700  is filled in the intervals between the leading portions  18  of the ground terminals  100  and the fourth shielding layer  34 , such that the solders  700  are connected to the fourth shielding layer  34  and the leading portions  18 , and the fourth shielding layer  34  and the ground terminals  100  are electrically connected. 
     As shown in  FIG. 1 ,  FIG. 2 , and  FIG. 14 , the support plate  4  is made of a printed circuit board, and specifically can be FR4. There are multiple layers of printed circuits  45  between an upper surface and a lower surface of the support plate  4 . A front side surface of the support plate  4  is provided with a stopped portion  41 , and a foolproof groove  44  is concavely formed inward from the front side surface of the support plate  4 . The lower surface of the support plate  4  has a first shielding layer  42 , and the upper surface of the support plate  4  has a second shielding layer  43 . As shown in  FIG. 1  and  FIG. 3 , the top portions of the insertion portions  2  are soldered upward to the lower surface of the support plate  4 . The insertion portions  2  are made of copper, which may be pure copper or a copper alloy, and is a copper alloy in this embodiment. Specifically, the copper alloy includes 98% of brass and 2% of tin in weight. In addition, surfaces of insertion portions  2  are plated with oxidation resistance coatings, and a material of the coatings is gold. The insertion portions  2  include a plurality of first insertion portions  21  to be clamped by the signal terminals  200  and a plurality of second insertion portions  22  to be clamped by the ground terminals  100 . The first shielding layer  42  extends to the second insertion portions  22 , such that the first shielding layer  42  and the second insertion portions  22  are conductively connected, and the second insertion portions  22  are connected in series. There are intervals between the first shielding layer  42  and the first insertion portions  21 , such that first shielding layer  42  and the first insertion portions  21  are not conductively connected. However, the second shielding layer  43  and the printed circuits  45  are connected, and the printed circuits  45  and the second insertion portions  22  are connected, such that the second shielding layer  43  and the second insertion portions  22  are electrically connected. As shown in  FIG. 14 , the upper surface of the support plate  4  further has a plurality of soldering regions  46 , and the chip module  500  is provided with a plurality of conductors  600  soldered to the soldering regions  46 . There are intervals between the conductors  600  and the second shielding layer  43 , such that the conductors  600  and the second shielding layer  43  are not conductively connected. The conductors  600  are electrically connected with the insertion portions  2  by multiple layers of the printed circuits  45 , and a distance between two adjacent insertion portions  2  is greater than a distance between two adjacent conductors  600 , such that there is sufficient space to provide the terminals  1  with a quantity same as a quantity of the conductors  600 . 
     As shown in  FIG. 1  and  FIG. 2 , a blocking frame  5  extends downward to form a plurality of fixing posts  53 , corresponding inserted downward into the fixing holes  35  to fix the blocking frame  5  to the substrate  3 . The blocking frame  5  has a stopping portion  51  located in front of the stopped portion  41 , and has a foolproof portion  52 . When the support plate  4  is mounted downward to the electrical connector  300 , the foolproof portion  52  is accommodated in the foolproof groove  44  to avoid inverse mounting. The stopping portion  51  overlaps with the stopped portion  41  along the front-rear direction. When each insertion portion  2  moves horizontally to the clamping portions  11 , the stopping portion  51  stops the stopped portion  41  forward along a horizontal movement direction of the insertion portion  2 . 
     To sum up, the electrical connector  300  and the electrical connector assembly according to certain embodiments of the present invention have the following beneficial effects: 
     (1) The distance between two clamping portions  11  of each terminal  1  gradually decreases upward from bottom thereof, and the position where the clamping portions  11  clamp the insertion portion  2  is higher than the virtual horizontal center line L of the insertion portion  2 , such that the clamping portions  11  form a downward pressure on the insertion portion  2 , thereby avoiding the upward movement of the chip module  500  due to an upward pushing force applied to the insertion portion  2 . 
     (2) Each insertion portion  2  is ball-shaped, so the insertion portion  2  has a smaller length and a greater width in the vertical direction, and the insertion portion  2  has sufficient strength to resist against impact of external force, such that the insertion portion  2  is not easily deformed, thereby ensuring good contact between the terminal  1  and the corresponding insertion portion  2 . In addition, each insertion portion  2  has a smaller length in the vertical direction, so the lower end of the insertion portion  2  is near a position P where the insertion portion  2  is clamped by the clamping portions  11 , thus alleviating an open stub effect may be alleviated, and thereby improving a high frequency. Further, each insertion portion  2  is made of copper, so the insertion portion  2  has a high melting point, allowing the insertion portion  2  to sustain a high temperature when the chip module  500  operates without deviating from the clamping portions  11  due to creeps and impacting the stability of the electrical connection between the chip module  500  and the electrical connector  300 . In addition, the hardness of copper is good, so an antioxidation coating layer plated on the surface of copper is not easily damaged due to scrapes of the clamping portions  11 . 
     (3) A portion of the insertion portion  2  lower than the top ends of the guide portions  12  protrudes forward from the clamping portions  11  and is accommodated in the accommodating space  15  of the adjacent terminal  1 . That is, the portion of the insertion portion  2  lower than the top ends of the clamping portions  11  is located right above the base  13  of the adjacent terminal  1 , such that a distance between the two adjacent terminals  1  in the front-rear direction is shortened, and the arrangement of the terminals  1  may be denser. 
     (4) The inner walls of the accommodating holes  31  are insulating, such that electrical conduction of the third shielding layer  33  and the fourth shielding layer  34  is performed without passing through the inner walls of the accommodating hole  31 , thereby reducing a capacity and improving a high frequency. 
     The foregoing description of the exemplary embodiments of the invention has been presented only for the purposes of illustration and description and is not intended to be exhaustive or to limit the invention to the precise forms disclosed. Many modifications and variations are possible in light of the above teaching. 
     The embodiments were chosen and described in order to explain the principles of the invention and their practical application so as to activate others skilled in the art to utilize the invention and various embodiments and with various modifications as are suited to the particular use contemplated. Alternative embodiments will become apparent to those skilled in the art to which the present invention pertains without departing from its spirit and scope. Accordingly, the scope of the present invention is defined by the appended claims rather than the foregoing description and the exemplary embodiments described therein.