Card edge connector with improved contacts

1. A card edge connector comprising:

a longitudinal insulating housing comprising two long walls and a bottom wall connecting with the long walls and defining a card slot in a longitudinal direction among the long walls and the bottom wall, each long wall having a receiving slot at a bottom face thereof;

two rows of contacts arranged in the long walls respectively, each contact comprising a retaining portion, a spring portion extending from the retaining portion, and a leg portion extending from the retaining portion and out of the insulating housing, the spring portions defining contacting portions projecting into the card slot, each row of contacts including signal contacts and ground contacts; and

a grounding member retained in the receiving slots of the long walls;

wherein the retaining portion defines an outer edge and an inner edge interfered with the insulating housing and two opposite plane faces connecting with the outer edge and the inner edge and disposed perpendicular to the longitudinal direction, and the grounding member elastically contacts the ground contacts along a transverse direction perpendicular to the longitudinal direction.

2. The card edge connector as claimed in claim 1 , wherein each of the retaining portions defines at least one hole through the opposite plane faces.

3. The card edge connector as claimed in claim 1 , wherein each of the retaining portions defines at least two holes through the opposite plane faces.

4. The card edge connector as claimed in claim 1 , wherein the outer edge of each retaining portion is formed with bars and contacts an associated long wall and the inner edge of each retaining portion is located nearer to the card slot than to an inner face of the associated long wall.

5. The card edge connector as claimed in claim 1 , wherein the retaining portion is in a square shape and defines four openings distinct from each other and arranged in two rows in a vertical direction.

6. The card edge connector as claimed in claim 1 , wherein the grounding member defines spring fingers elastically contacting the ground contacts.

7. The card edge connector as claimed in claim 6 , wherein the grounding member comprises two long plates separate from the signal contacts, the spring fingers bend from a bottom edge of each long plate and slant upward toward the plate outer edges of the ground contacts.

8. The card edge connector as claimed in claim 1 , wherein each of the ground contacts defines a spring finger, the spring fingers elastically contacting the grounding member.

9. The card edge connector as claimed in claim 8 , wherein a plurality of retaining ribs extent upward from an upper edge of longer plate and interfered with the long wall.

10. The card edge connector as claimed in claim 1 , wherein the leg portions of each row of contacts are divided into two rows.

11. The card edge connector as claimed in claim 1 , wherein the grounding member is disposed substantially within the receiving slots of the long walls.

12. The card edge connector as claimed in claim 1 , wherein the grounding member is constantly in contact with the ground contacts.

13. A card edge connector comprising:

a longitudinal insulating housing comprising two long walls and a bottom wall connecting with the long walls and defining a card slot in a longitudinal direction among the long walls and the bottom wall, each long wall having a receiving slot at a bottom face thereof;

a row of contacts arranged in one of the two long walls and including signal contacts and ground contacts, each contact comprising a retaining portion, a spring portion extending upward from the retaining portion with contacting portions projecting into the card slot, and a leg portion extending downward from the retaining portion; and

a grounding member retained in the receiving slot of said one long wall;

wherein each of the retaining portions define an outer edge and inner edge both interfered with the insulating housing and two opposite plane faces connecting with the outer and inner edge and disposed perpendicular to the longitudinal direction, the inner edges of retaining portions are aligned with the contacting portions from a top view, and the grounding member elastically contacts the ground contacts along a transverse direction perpendicular to the longitudinal direction.

14. The card edge connector as claimed in claim 13 , wherein each of the retaining portions defines at least one hole through the opposite plane faces.

15. The card edge connector as claimed in claim 13 , wherein one of the ground member and the ground contacts comprises spring fingers elastically contact another of the ground member and the ground contacts.

16. The card edge connector as claimed in claim 15 , wherein the spring fingers extend from the outer edges of the retaining portions of the ground contacts to contact the grounding member.

17. The card edge connector as claimed in claim 16 , wherein the signal contacts define spring fingers extending from the outer edges of the retaining portions thereof but spaced from the grounding member.

18. The card edge connector as claimed in claim 13 , wherein the grounding member is disposed substantially within the receiving slot of the long wall.

19. The card edge connector as claimed in claim 13 , wherein the grounding member is constantly in contact with the ground contacts.