Electrical interconnect with conductive polymer contacts having tips with different shapes and sizes

1. A socket assembly comprising:

an electrical interconnect having an insulator having an upper surface and a lower surface, the insulator including apertures therethrough, the electrical interconnect including primary contacts received in corresponding apertures and secondary contacts received in corresponding apertures, the primary contacts including primary conductive polymer columns having upper contact tips extending above the upper surface to distal ends and lower contact tips extending below the lower surface to distal ends, the upper and lower contact tips for electrically interconnecting first and second electronic packages, respectively, the secondary contacts including secondary conductive polymer columns having upper contact tips extending above the upper surface to distal ends and lower contact tips extending below the lower surface to distal ends, the upper and lower contact tips for electrically interconnecting the first and second electronic packages, respectively;

wherein the upper contact tips above the upper surface of the primary conductive polymer columns have a first shape and the upper contact tips above the upper surface of the secondary conductive polymer columns have a second shape different from the first shape to provide shielding in spaces between the upper contact tips of the primary conductive polymer columns; and

wherein the lower contact tips below the lower surface of the primary conductive polymer columns have a third shape and the lower contact tips below the lower surface of the secondary conductive polymer columns have a fourth shape different from the third shape to provide shielding in spaces between the lower contact tips of the primary conductive polymer columns.

2. The socket assembly of claim 1 , wherein the upper contact tips of the primary conductive polymer columns have a circular shape and the upper contact tips of the secondary conductive polymer columns have a noncircular shape, and wherein the lower contact tips of the primary conductive polymer columns have a circular shape and the lower contact tips of the secondary conductive polymer columns have a noncircular shape.

3. The socket assembly of claim 2 , wherein the upper and lower contact tips of the secondary conductive polymer columns have a rectangular shape.

4. The socket assembly of claim 2 , wherein the upper and lower contact tips of the secondary conductive polymer columns are generally ring shaped.

5. The socket assembly of claim 1 , wherein the upper contact tips of the primary conductive polymer columns are circular having a first diameter and the upper contact tips of the secondary conductive polymer columns are circular having a second diameter different than the first diameter, and wherein the lower contact tips of the primary conductive polymer columns are circular having a third diameter and the lower contact tips of the secondary conductive polymer columns are circular having fourth diameter different than the third diameter.

6. The socket assembly of claim 1 , wherein the primary conductive polymer columns each include an upper portion between the upper surface and the upper contact tips and a lower portion between the lower surface and the lower contact tips, the upper portions being frusto-conical shaped, the lower portions being frusto-conical shaped.

7. The socket assembly of claim 6 , wherein the secondary conductive polymer columns each include an upper portion between the upper surface and the upper contact tips and a lower portion between the lower surface and the lower contact tips, the upper portions being frusto-conical shaped, the lower portions being frusto-conical shaped.

8. The socket assembly of claim 6 , wherein the secondary conductive polymer columns each include an upper portion between the upper surface and the upper contact tips and a lower portion between the lower surface and the lower contact tips, the upper portions being parallel-piped shaped, the lower portions being trapezoidal shaped.

9. The socket assembly of claim 1 , wherein the upper contact tips of the primary and secondary conductive polymer columns are generally coplanar, and wherein the lower contact tips of the primary and secondary conductive polymer columns are generally non-coplanar.

10. The socket assembly of claim 1 , wherein the upper contact tips of the primary conductive polymer columns have a first surface area and the upper contact tips of the secondary conductive polymer columns have a second surface area different from the first surface area, and wherein the lower contact tips of the primary conductive polymer columns have a third surface area and the lower contact tips of the secondary conductive polymer columns have a fourth surface area different from the third surface area.

11. The socket assembly of claim 10 , wherein the second surface area is at least twice the first surface area and the fourth surface area is at least twice the third surface area.

12. The socket assembly of claim 1 , wherein at least one of the secondary conductive polymer columns surround at least one of the primary conductive polymer columns both above the upper surface and below the lower surface to form a shield fence to isolate the surrounded at least one primary conductive polymer column from at least one other primary conductive polymer column.

13. The socket assembly of claim 1 , further comprising a socket frame coupled to the insulator, the socket frame having a socket opening configured to receive and orient the first electronic package relative to the electrical interconnect.

14. The socket assembly of claim 1 , wherein the secondary conductive polymer columns are electrically commoned to provide shielding for the primary conductive polymer columns.

15. The socket assembly of claim 1 , wherein the secondary conductive polymer columns have a larger volume than the primary conductive polymer columns, the secondary conductive polymer columns having a higher current carrying capacity than the primary conductive polymer columns.

16. A socket assembly comprising:

an electrical interconnect having an insulator having an upper surface and a lower surface, the insulator including apertures therethrough, the electrical interconnect including primary contacts received in corresponding apertures and secondary contacts received in corresponding apertures, the primary contacts including primary conductive polymer columns having upper contact tips extending above the upper surface to distal ends and lower contact tips extending below the lower surface to distal ends, the upper and lower contact tips for electrically interconnecting first and second electronic packages, respectively, the secondary contacts including secondary conductive polymer columns having upper contact tips extending above the upper surface to distal ends and lower contact tips extending below the lower surface to distal ends, the upper and lower contact tips for electrically interconnecting the first and second electronic packages, respectively;

wherein the upper contact tips above the upper surface of the primary conductive polymer columns have a first surface area and the upper contact tips above the upper surface of the secondary conductive polymer columns have a second surface area different from the first surface area to provide shielding in spaces between the upper contact tips of the primary conductive polymer columns; and

wherein the lower contact tips below the lower surface of the primary conductive polymer columns have a third surface area and the lower contact tips below the lower surface of the secondary conductive polymer columns have a fourth surface area different from the third surface area to provide shielding in spaces between the lower contact tips of the primary conductive polymer columns.

17. The socket assembly of claim 16 , wherein the second surface area is at least twice the first surface area and the fourth surface area is at least twice the third surface area.

18. The socket assembly of claim 16 , wherein the primary conductive polymer columns each include an upper portion between the upper surface and the upper contact tips and a lower portion between the lower surface and the lower contact tips, the upper portions being frusto-conical shaped, the lower portions being frusto-conical shaped, the secondary conductive polymer columns each include an upper portion between the upper surface and the upper contact tips and a lower portion between the lower surface and the lower contact tips, the upper portions being non-frusto-conical shaped, the lower portions being non-frusto-conical shaped.

19. A socket assembly comprising:

an electrical interconnect having an insulator having an upper surface and a lower surface, the insulator including apertures therethrough, the electrical interconnect including primary contacts received in corresponding apertures and a secondary contact received in the corresponding aperture, the primary contacts including primary conductive polymer columns having upper contact tips extending above the upper surface to distal ends and lower contact tips extending below the lower surface to distal ends for electrically interconnecting first and second electronic packages, respectively, the secondary contact including a secondary conductive polymer column having an upper contact tip extending above the upper surface to distal ends and a lower contact tip extending below the lower surface to distal ends opposite the upper contact tip, the upper and lower contact tips for electrically interconnecting the first and second electronic packages, respectively, wherein at least one of the secondary conductive polymer column forming a shield fence surrounding at least one of the primary conductive polymer columns both above the upper surface and below the lower surface to isolate the surrounded primary conductive polymer column from at least one other primary conductive polymer column.

20. The socket assembly of claim 19 , wherein the primary conductive polymer columns are arranged in pairs configured to convey high-speed differential signals, the shield fence defined by the at least one secondary conductive polymer column surrounding the corresponding pair of primary conductive polymer columns.