BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an electrical connector with at least one shielding plate defining grounding portions for contacting grounding terminals.
2. Description of Related Arts
Many electrical connectors include signal terminals and ground terminals in which the signal terminals convey data signals and the ground terminals reduce crosstalk and/or electromagnetic interference (EMI) between the signal terminals. In differential signaling applications, the signal terminals are arranged in signal pairs for carrying the data signals.
To address grounding resonance issue with a higher and higher signal-transmitting application, previous patents apply grounding bars to push the resonance frequency to a higher frequency. A metallic grounding bar connects all grounding terminals among signal terminals together, thereby realizing a common grounding bar. U.S. Pat. No. 8,764,464 discloses a shieldless grounding coupling assembly, which shift unwanted spikes in insertion loss resonance frequencies to a higher frequency. Therefore, the shift resonance frequencies of existing connectors can extend to a higher operating frequency range without changing the mating or mounting interface dimensions of existing standardized or non-standardized connectors. U.S. Pat. No. 8,545,240 discloses a grounding bridge connecting with grounding terminals, which can reduce an electrical length of the grounding terminals and move a resonance frequency of the grounding terminals of the connector outside the range of the frequencies at which signal will transmit.
Therefore, an improved electrical connector is desired.
SUMMARY OF THE INVENTION
An object of the present invention is to provide an electrical connector with an improved shielding plate.
In order to achieve above-mentioned object, an electrical connector comprises: a housing; a row of first terminals retained in the housing and comprising signal terminals and grounding terminals, each first terminal comprising a plate portion and a leg portion extending out of the housing, the plate portion defining an outer face exposed upon the housing and an inner face opposite the outer face, the outer face of the plate portion of the terminal defining a mating face; a first shielding plate parallel to and located by the inner faces of the first terminals, wherein the first shielding plate defines a plurality of first grounding portions, each first grounding portion defines a vertical cutting face which touches a corresponding inner face of the plate portion of an associated grounding terminal.
Other objects, advantages and novel features of the present invention will become more apparent from the following detailed description of the present embodiment when taken in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is a top perspective view of an electrical connector in accordance with the present invention;
FIG. 2 is a bottom perspective view of the electrical connector of FIG. 1;
FIG. 3 is an exploded perspective view of the electrical connector of FIG. 1;
FIG. 4 is another exploded perspective view of the electrical connector of FIG. 3 without the metallic shell;
FIG. 5 is a partially exploded perspective view of a shielding member and two rows of terminals of the electrical connector of FIG. 3;
FIG. 6 is a bottom perspective view of the shielding member of FIG. 3;
FIG. 7 is a bottom perspective view of the shielding member and the two rows of terminals of FIG. 3 in part;
FIG. 8 is a front elevational view of the shielding member and the two rows of terminals of FIG. 3 in part;
FIG. 9 is a top plan view of the shielding member and the two rows of terminals of FIG. 3 in part;
FIG. 10 is a bottom plan view of the shielding member and the two rows of terminals of FIG. 3 in part;
FIG. 11 is an exploded perspective view of a mating block of the electrical connector of FIG. 3;
FIG. 12 is a bottom perspective view of a plug connector adapted for mating with the electrical connector of FIG. 1;
FIG. 13 is a top perspective view of the plug connector of FIG. 12;
FIG. 14 is an exploded view of the plug connector of FIG. 13; and
FIG. 15 is a perspective view of terminal modules, cables and a grounding member of FIG. 14.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Reference will now be made to the drawing figures to describe the preferred embodiment of the present invention in detail.
An electrical connector assembly of an embodiment of this present invention comprises a receptacle connector 100 to be mounted on a printed circuit board (PCB) and a cable plug connector 600 connecting with two rows of cables adapted for mating with the electrical connector 100.
FIGS. 1-11 illustrate the receptacle connector 200. As best shown in FIGS. 1-2, the receptacle connector 100 includes a housing 10, terminals 20 made from a metal plate and retained in the housing 10 and a metallic shell 40. The housing 10 includes a mating tongue 11 and a frame portion 12 surrounding the mating tongue 11, commonly defining a mating cavity 13 between the mating tongue 11 and the frame portion 12, the mating cavity 13 runs through a mating face 101 defined on the housing 10. The metallic shell 40 is attached an outside of the wall portion 12 and protrudes upward beyond the mating face 101. A first side plate 41 of the shell 40 defines two locking holes 411, locking heads 652 of a locking arm 651 of the plug connector 200 protrude into the locking holes 411 from an outside of the first side plate 411, thereby obtaining a locking function of the two connectors. A second side plate 42 is substantial flushed with the mating face 101 and have a top edge lower than that of the first side plate 41. Two end plates 43 is of a step shape, each includes a first taller portion 431 and a second taller portion 432 extending beyond the mating face 101, the second taller portion 432 is substantial flushed with the first side plate 41 and higher than the first taller portion 431. Parts of the first taller portions 431 extend to the second side plate 42. A plurality of guiding tabs 44 extends upwards from the first side plate 41 and the second taller portion 432. Combination with FIG. 12, understandingly, the step portion of the metallic shell 40 provides an improved guiding performance during an engagement of the two connectors, and an improved enforced balance of two connectors. The housing 10 defines retaining portions 153 with slits, the shell 40 seats in the slits for fitly retaining the shell on the housing 10.
Referring to FIGS. 3-4 the housing 10 includes a mating block 14 and housing block 15 assembled together, the mating block 14 includes the mating tongue 11 and a mounting portion 141 below the mating tongue 11, the housing block 15 includes a board portion 151 with a mounting opening 1511 and the frame portion 12. The mating block 14 is assembled through the mounting opening 1511 from a bottom end of the housing block 15, and the mounting portion 141 is fitly retained in the mounting opening 1511, thereby forming the housing 10. The mounting portion 141 defines two retaining lumps 1414 at opposite ends thereof, the board portion 151 defines recesses 1512 at a bottom face thereof. The retaining lumps 1414 are retained in the recesses 1512. Please notes, the recesses 1512 do not go upwards through the board portion 151, for limiting an upward movement of the mating block 14. In this embodiment, the terminals 20 are set in two rows and retained in the mating block 14. The mounting opening 1511 defines plural upright ribs (not labeled) and two slots (not labeled), the mating block 14 is interfered with the upright ribs and defines lumps received in the slots.
Referring to FIGS. 5-6, the terminals 20 includes plate portions 21 and leg portions 22 extending from the plate portions 21 out of the housing 10, the plate portion 21 defines an inner face 212 and an outer face 211 exposed upon the housing 10 and functioned as a mating face or portion 213 as shown in FIG. 3. Each row of the terminals 20 at least includes a signal terminal 20S and a grounding terminal 20G, in this embodiment two adjacent signal terminal 20S are construed as a pair of differential signal terminals, the grounding terminals 20G and the pairs of differential signal terminals alternate one by one. Each pair of differential signal terminals is sandwiched between two grounding terminals 20G at opposite sides thereof. The plate portions 21 of the grounding terminal 20G are longer than that of the signal terminals 20S and wider than that of the signal terminals.
In this embedment, a shielding member 30 with two shielding plates is added between the two rows of terminals 20, i.e., a row of first terminals 20a and a row of second terminals 20b. The shielding member 30 includes a first shield plate 31 and a second shielding plate 32 and a connecting bar 33 unitarily connecting with the first and second shielding plates 31, 32.
The first shield plate 31 is made from a metal plate and then cut in an upright direction and then in a longitudinal direction to form a plurality of portions, the portions bend in a transverse direction perpendicular to the upright direction and the longitudinal direction, thereby forming a plurality of first grounding portions 311. Each first grounding portion 311 defines an upright cutting face 3111 and a horizontal cutting face (not labeled). Similarly, the second shielding plate 32 defines a plurality of second grounding portions 321 with an upright cutting face 3211. The first shielding plate 31 is disposed by the inner faces 212 of the plate portions 21 of the row of the first terminals 20a, the upright cutting faces 3111 press against the inner faces 212 of the plate portions of corresponding grounding terminals 20G of the row of the first terminals 20a. Similarly, the second shielding plate 32 is located by an inner side of the row of the second terminals 20b, the upright cut faces 3211 of the second grounding portions 321 press against the inner faces 212 of the plate portions of corresponding grounding terminals 20G of the row of the second terminals 20b. Please notes, the face contacts between the grounding portions and the grounding terminals increase the quantity of contacting points, resulting in shifting a resonance frequency of the receptacle connector 200 to a high range to meet a requirement of electrical performance. Please note, the definition of first and second in this embodiment is only to indicate different elements, with no sequence of the elements.
The reminder portions between the adjacent grounding portions keep as shielding portions 312, 322, as shown in FIG. 8, top edges of the shielding portions are higher than top edges of the signal terminals 20G. Top edges of the grounding portions 311, 321 are lower than that of the grounding terminals 20G. A width of each shielding portion 312, 322 is wider than that of the two plate portions of corresponding pair of the differential signal terminals. Therefore, the shielding portions 313, 323 shield the pairs of the differential signal terminals in the longitudinal direction and the upright direction. In a view from a bottom end of the housing 10 as shown in FIG. 10, the shielding portions 312, 322 are aligned with each other, the grounding portions 311, 321 are of an L shape, the first grounding portions 311 extend from a first/left side of the first shielding portions 312, the second grounding portions 321 extend from a second/right side of the second shielding portions 322. Another sides of the shielding portions have no grounding portions. Viewed in a direction perpendicular to the shielding portions 312, 322, the first grounding portions 311 are overlapped with the adjacent second grounding portions 321. Therefore, in the longitudinal direction, the first and second shielding portions 312, 322 have entire shielding performance. The grounding portions 311,321 and the shielding portions 312, 322 are of an L-shape or of a C shape, which are not a closed shape and destroy resonance cavity illustrating in arrows in FIG. 10, so as to improve high transmit electrical performance. The first and the second shielding portions 312, 322 protrude downward beyond the bottom face of the housing, as shown in FIG. 4.
Understanding, each row of terminals is arranged in a first direction/the longitudinal direction, and each terminal extends in a second direction perpendicular to the first direction. The shielding plate define a plurality of L-shaped slits 34 running through a bottom edge thereof, the grounding portions bend along the corresponding L-shaped slits. The shielding portion 321, 322 extends in the first direction and the second direction, the grounding portions 311, 321 bends from the corresponding shielding portions in a third direction/the transverse direction perpendicular to the first direction and the second direction. As seen, the shielding portions are separated from the adjacent shielding portion and only unitarily connected with the connecting bar 33, the grounding portions are separated from the adjacent grounding portions and separated from the connecting bar 33. That is, the shielding portions are separated from each other and the grounding bending from the same sides of the corresponding shielding portions. Therefore, the shielding portion and corresponding grounding portion construe an opening shape, which will not form a resonance cavity.
Referring to FIG. 11, insulating material is inserted molded with the shielding member 30 and forms a first assembly including the first insulator 16 and the shielding member 30 embedded in the first insulator 16. The grounding portions 311, 321 are exposed upon opposite outer faces of the first insulator 16, and the two rows of terminals are positioned in the opposite outer faces of the first insulator 16, please note, the grounding terminals 20G is disposed on the grounding portions 311, 321. Another insulating material is inserted molded with the first assembly and form a second insulator 17 enclosing the first insulator 16 and the two rows of the terminals 20, which construe said mating block 14. Please note, the first insulator 16 defines plural of positioning lumps 161 at the outer face thereof, to position the signal terminals and the grounding terminals in the outer face of the first insulator. The first insulator 16 and the second insulator have similar dielectric constant, floated up and down 10%. The insulating material of the first housing 16 can be wave-absorbing material, like carbonium which has an obvious function to restrain cross-talk. When the carbonium content of the first insulator up to 32%, the electrical performance of the receptacle connector 100 can meet the requirement of fine pitch connectors.
In FIGS. 12-16, the plug connector 600 includes two contact modules 61 and two rows of cables 62 connecting with the contact modules, the contact modules are assembly in the insulating base 63 and define a receiving cavity 631 into which elastic contacts 611 extend. An upper insulating cover 641 and a lower insulating cover 642 cover the insulating base 63 to retain the insulating base, cables together. The locking member 65 is assembled on the insulating cover 64 and a strip 66 connects with the locking member 65. The cables connect with the elastic contacts of the contact modules 61 and a grounding member 67 is disposed over the cables, grounding fingers extend from a middle portion of the grounding member 67 are soldered with the grounding terminals of the elastic terminals, and other terminals are vacant.
In alternative embodiment, the shielding member can be made by punch, cast. The shielding member can be made from material of high magnetic conductivity, including but not limited to Fe, Co, or Ni element or its alloy.
Although the present invention has been described with reference to particular embodiments, it is not to be construed as being limited thereto. Various alterations and modifications can be made to the embodiments without in any way departing from the scope or spirit of the present invention as defined in the appended claims.
Patent Application
20230238746
