Electrical connector

1. Field of the Invention

The present invention relates to an electrical connector, and particularly to the electrical connector for high frequency transmission.

2. Description of Related Arts

US application publication number 20090221165 discloses an electrical connector equipped with a grounding bar for enhancing electrical performance. Anyhow, currently the transmission speed will become 32GT/s and the transmission bandwidth will become 128 Gbps so such a simple grounding bar with the single contacting point for the corresponding grounding contact may not satisfy the required criteria.

Therefore, it is desired to provide an electrical connector with an improved grounding bar for achieving the required performance under the aforementioned transmission criteria.

An electrical connector includes an insulative housing with a base and a mating tongue forwardly extending from the base in a front-to-back direction, and a plurality of contacts retained in the housing. The contacts include a plurality of differential-pair contacts and a plurality of grounding contacts alternately arranged with each other in the transverse direction. A metallic grounding plate is forwardly inserted into the horizontal center slot of the mating tongue with at least two sets of spring tangs welded to spaced positions of the corresponding grounding contacts, respectively so as to have each grounding contacts mechanically and electrically connected with the grounding plate at at least two spaced positioned in the front-to-back direction.

Other advantages and novel features of the invention will become more apparent from the following detailed description of the present embodiment when taken in conjunction with the accompanying drawings.

FIG. 1 is a perspective view of an electrical connector according to the invention;

FIG. 2 is another 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 ;

FIG. 5 is a perspective view of a combination including the grounding plate and the first set of contacts of the electrical connector of FIG. 1 ;

FIG. 6 is a cross-sectional view of the electrical connector of FIG. 1 along line 6 - 6 to show how the grounding plate cooperates with the first set of contacts; and

FIG. 7 is a cross-sectional view of the connector connector of FIG. 1 to show how the grounding plate cooperates with the second set of contacts.

An electrical connector 100 includes an insulative housing 1 , a plurality of contacts 2 retained to the housing 1 , a metallic grounding plate 3 , a first insulator 4 and a second insulator 5 . The contacts 2 includes a plurality of differential-pair contacts S 1 and a plurality of grounding contacts S 2 alternately arranged with each other along the transverse direction. The grounding plate 3 includes a plurality of first spring tangs 31 , second spring tangs 32 and third spring tangs 33 to be welded to different positions of the corresponding grounding contacts G 1 , respectively.

In detail, the housing 1 includes a base 11 and a mating tongue 12 forwardly extending from the base 11 in the front-to-back direction. The mating tongue 12 forms opposite upper face 121 and lower face 122 . A plurality of passageways 123 are formed in the upper face 121 and the lower face 122 . A raised portion 120 is formed on the upper face 121 . The contact 2 includes a contacting section 21 received in the passageway 123 , a tail 22 extending outside of the housing 1 , and a retaining section 23 between the contacting section 21 and the tail 22 . A narrowed section 24 is formed at a front end of the contacting section 21 with flanges 241 on two sides. The passageway 123 forms the corresponding block 124 for compliance with the flanges 241 .

The contacts 2 are forwardly assembled into the housing 1 from a rear side of the housing 1 , and includes a first set of contact 2 a occupying all the lower face 122 , and a second set of contacts 2 b , a third set of contacts 2 c and a fourth set of contacts 2 d commonly sharing the upper face 121 wherein the four set of contacts 2 d are located on the raised portion 120 and the second set of contacts 2 b and the third set of contacts 2 c are respectively located by two sides of the raised portion 120 .

The first set of contacts 2 a includes a plurality of differential-pair contacts S 1 and a plurality of grounding contacts G 1 alternately arranged with each other in the transverse direction as well as the differential-pair contacts S 2 and the grounding contacts G 2 of the second set of contacts 2 b and the differential-pair contacts S 4 and the grounding contacts G 4 of the fourth set of contacts 2 d while all the third set of contacts 2 c are the power contacts P 3 .

The grounding plate 3 is forwardly assembled into the housing 1 and essentially located at a center position of the mating tongue 12 so as to be located between the first set of contacts 2 a and the other contacts 2 b , 2 c and 2 d in the vertical direction. The grounding plate 3 is essentially of a frame structure with front and rear transverse bars 34 linked by a plurality of bridges 35 . The transverse bars 34 extend in the transverse direction while the bridges extend in the front-to-back direction. The first spring tangs 31 , the second spring tangs 32 and the third spring tangs 33 extend downwardly from the transverse bar 34 wherein the first spring tang 31 and the second sprint tang 32 respectively extend forwardly and rearwardly from the front transverse bar 31 , and the third spring tang 33 extends forwardly from the rear transverse bar 31 . Each grounding contact G 1 mechanically and electrically contacts all the corresponding first spring tang 31 , the second spring tang 32 and the third spring tang 33 at different positions for reducing the electromotive force difference along the grounding contact G 1 and eliminating the crosstalk. In a top view, the first spring tang 31 , the second spring tang 32 and the third spring tang 33 are aligned with one another in the front-to-back direction, while the bridge 35 is located between the two contacts of the corresponding pair of the differential-pair contacts. Also, in a top view, in the grounding plate 3 , a plurality of rectangular frame structures are formed by cooperation of the transverse bars 34 and the corresponding bridges 35 . Each frame structure receives at least one second spring tang and one third spring tang therein.

The first spring tang 31 contacts the narrowed section 24 , the second spring tang 32 contacts the contacting section 21 , and the third spring tang 33 contacts the retaining section 23 . The distance between the contact area 36 of the first spring tang 31 and the contact area 36 of the second spring tang 32 is smaller than the distance between the contact area 36 of the second spring tang 32 and the contact area 36 of the third spring tang 33 . Notably, the spot welding may be applied upon the contact area 36 for securing the spring tang to the grounding contact G 1 .

The front and rear transverse bars 31 further include a plurality of fourth spring tangs 37 and fifth spring tangs 38 upwardly extend therefrom to contact the contacting sections 21 and the retaining sections 23 of the corresponding grounding contacts G 2 of the second set of contacts 2 b . Via cooperation of all the first spring tangs 31 , the second spring tangs 32 , the third spring tang 33 , the fourth spring tangs 34 and the fifth spring tangs 35 , a circuit loop for grounding is formed. In this embodiment, the width of the first set of contacts 2 a is smaller than that of the second set of contacts 2 b . In opposite, the widths of the first, second third spring tangs 31 , 32 , 33 which work with the first set of contacts 2 a , are larger than those of the fourth and fifth spring tangs 37 , 38 which work with the second set of contacts 2 b.

All first set of contacts 2 a are integrally formed, via insert-molding, within a first insulator 4 which is located behind the housing 1 . The first insulator 4 forms a plurality of recesses 41 to receive the corresponding third spring tangs 33 so as to allow the increased distance between the contact area of the second spring tang 32 and that of the third spring tang 33 for better electrical performance. Similarly, all second set of contacts 2 b are integrally formed, via insert-molding, within a second insulator 5 located behind the housing 1 . The second insulator 5 also forms a plurality of recesses (not labeled) to receive the corresponding fifth spring tang 38 as shown in FIG. 7 . The rear region of the grounding plate 3 can be sandwiched between the first insulator 4 and the second insulator 5 in the vertical direction. Differently, both the third set of contacts 2 c and the fourth set of contacts 2 d are directly secured to the housing 1 without involvement of any insulator. It is also understood that the mating tongue 12 forms a plurality of cavities (not labeled) in aligned with the corresponding grounding contacts in the vertical direction to allow the corresponding spring tangs to extend.

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.