Dual element electrical contact and connector assembly utilizing same

• US 5,230,632 A
• Filed: 12/19/1991
• Issued: 07/27/1993
• Est. Priority Date: 12/19/1991
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Kershaw, James J., Petrozello, James R., Baumberger, John G.
• Primary Examiner(s): Bradley, Paula A.
• Application Number:
  US07/810,601
• Time in Patent Office: 586 Days
• Field of Search: 439/66, 439/74, 439/80-82, 439/161, 439/247, 439/591, 439/886, 439/887, 439/889, 439/908
• US Class Current: 439/66
• CPC Class Codes: G01R 1/06738 related to tip portion
• CPC Class Codes: G01R 1/06755 Material aspects
• CPC Class Codes: H01R 12/714 with contacts abutting directly the printed circuit; Button contacts therefore provided on the printed circuit
• CPC Class Codes: H01R 13/03 characterised by the material, e.g. plating, or coating materials
• CPC Class Codes: H01R 13/2435 with opposite contact points, e.g. C beam

Abstract

An electrical contact and connector assembly utilizing same wherein the contact includes a first, highly conductive element (e.g., oxygen-free copper) having a first modulus of elasticity and including a pair of contacting portions each of which is designed for engaging respective conductors on first and second circuit members, and a second, spring element (e.g., stainless steel) operatively coupled to the first conductive element and having a second modulus of elasticity greater than that of the first, conductive element. A connector assembly is also defined which includes a common housing for having the contact (preferably several) located therein. The housing is metallic (e.g., stainless steel) and includes a coating of suitable dielectric material on appropriate surfaces thereof so as to prevent electrical shorting with the internally contained contacts. A preferred coating for this purpose is polyimide.

Claims

1. An electrical contact for electrically interconnecting first and second circuit members, said contact comprising:

a first malleable conductive element comprised of metallic material and having a first modulus of elasticity and including first and second opposed contacting portions for engaging said first and second circuit members, respectively; and

a second, spring element comprised of metallic material and joined to said first, conductive element in direct physical contact therewith, said second, spring element having a second modulus of elasticity greater than said first modulus of elasticity of said first, conductive element, said electrical contact being of substantially C-shaped configuration.

2. The electrical contact according to claim 1 wherein said first, conductive element possesses a first modulus of elasticity within the range of from about 10×

10⁶ PSI to about 17×

10⁶ PSI.

3. The electrical contact according to claim 1 wherein said second, spring element possesses a second modulus of elasticity within the range of from about 16×

10⁶ PSI to about 29×

10⁶ PSI.

4. The electrical contact according to claim 1 wherein said metallic material of said first, conductive element is selected from the group consisting essentially of oxygen-free copper, annealed gold, annealed silver and annealed aluminum.

5. The electrical contact according to claim 1 wherein said metallic material of said second, spring element is selected from the group consisting essentially of stainless steel, phosphor bronze and beryllium copper.

6. The electrical contact according to claim 1 wherein said first, conductive element is positioned along an external surface of said second, spring element.

7. The electrical contact according to claim 1 wherein said first, conductive element is positioned along an internal surface of said second, spring element.

8. The electrical contact according to claim 1 wherein the ratio of said second modulus of elasticity to said first modulus of elasticity is within the range of from about 3:

1 to about 1;

1.

9. The electrical contact according to claim 1 wherein said first and second contacting portions of said first, conductive element each include a plurality of dendritic elements thereon, said dendritic elements being growth elements of conductive metal crystals.

10. An electrical connector assembly for electrically interconnecting first and second circuit members, said assembly comprising:

a housing adapted for being positioned substantially between said first and second circuit members; and

a plurality of electrical contacts spacedly positioned within said housing, selected ones of said electrical contacts including a first, malleable conductive element comprised of metallic material and having a first modulus of elasticity and including first and second opposed contacting portions for engaging said first and second circuit members, respectively, and a second, spring element comprised of metallic material and joined to said first, conductive element in direct physical contact therewith and having a second modulus of elasticity greater than said first modulus of elasticity of said first, conductive element, said electrical contact being of substantially C-shaped configuration.

11. The electrical connector assembly according to claim 10 wherein said first, conductive element possesses a first modulus of elasticity within the range of from about 10×

10⁶ PSI to about 17×

10⁶ PSI.

12. The electrical connector assembly according to claim 10 wherein said second, spring element possesses a second modulus of elasticity within the range of from about 16×

10⁶ PSI to about 29×

10⁶ PSI.

13. The electrical connector assembly according to claim 10 wherein said metallic material of said first, conductive element is selected from the group consisting essentially of oxygen-free copper, annealed gold, annealed silver and annealed aluminum.

14. The electrical connector assembly according to claim 10 wherein said metallic material of said second, spring element is selected from the group consisting essentially of stainless steel, phosphor bronze and beryllium copper.

15. The electrical connector assembly according to claim 10 wherein said first, conductive element is positioned along an external surface of said second, spring element.

16. The electrical connector assembly according to claim 10 wherein said first, conductive element is positioned along an internal surface of said second, spring element.

17. The electrical connector assembly according to claim 10 wherein the ratio of said second modulus of elasticity to said first modulus of elasticity is within the range of from about 3:

1 to about 1;

1.

18. The electrical connector assembly according to claim 10 wherein said first and second contacting portions of said first, conductive element each include a plurality of dendritic elements thereon, said dendritic elements being growth elements of conductive metal crystals.

19. The electrical connector assembly according to claim 10 wherein said housing includes a plurality of chambers therein, said electrical contacts being positioned within respective ones of said chambers.

20. The electrical connector assembly according to claim 19 wherein said housing is comprised of metallic material and includes a layer of electrically insulative material at selected locations thereon to prevent electrical shorting between said electrical contacts and said metallic material of said housing.

21. The electrical connector assembly according to claim 20 wherein said metallic material of said housing is selected from the group consisting essentially of stainless steel, copper and electrically conductive polymer.

22. The electrical connector assembly according to claim 21 wherein said electrically insulative material is selected from the group consisting essentially of polyimide, polytetrafluoroethylene and epoxy.

23. An information handling system comprising:

an electrical connector assembly for electrically interconnecting first and second circuit members, said assembly including a housing adapted for being positioned substantially between said first and second circuit members, and a plurality of electrical contacts spacedly positioned within said housing, selected ones of said electrical contacts including a first, malleable conductive element comprised of metallic material and having a first modulus of elasticity and including first and second opposed contacting portions for engaging said first and second circuit members, respectively, and a second, spring element comprised of metallic material and joined to said first, conductive element in direct physical contact therewith and having a second modulus of elasticity greater than said first modulus of elasticity, said electrical contacts being of substantially C-shaped configuration.