Method of fabricating electrical connector for surface mounting

• US 4,729,166 A
• Filed: 07/22/1985
• Issued: 03/08/1988
• Est. Priority Date: 07/22/1985
• Status: Expired due to Term

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Digital Equipment Corporation (HP Inc.)
• Inventors: Lee, James, Beck, Richard, Lee, Chune, Hu, Edward
• Primary Examiner(s): Eley, Timothy V.
• Application Number:
  US06/757,600
• Time in Patent Office: 960 Days
• Field of Search: 29/876, 29/877, 29/878, 339/17, 339/59-61, 339/DIG. 3, 174/35 GC
• US Class Current: 29/877
• CPC Class Codes: H01B 1/22 the conductive material comprising metals or alloys
• 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 13/2414 conductive elastomers
• CPC Class Codes: H01R 43/007 for elastomeric connecting elements
• CPC Class Codes: H01R 43/16 for manufacturing contact members, e.g. by punching and by bending
• CPC Class Codes: Y10T 29/4921 with bonding

Abstract

An anisotropic elastomeric conductor is fabricated by stacking a plurality of first and second sheets, where the first sheets include a plurality of parallel electrically conductive fibers and the second sheets are composed of electrically insulating material. By introducing a curable elastomeric resin into the layered structure of sheets, and then curing the resin, a solid elastomeric block having a plurality of parallel electrically conductive fibers running its length is obtained. Individual elastomeric conductors suitable for interfacing between electronic components are obtained by slicing the block in a direction perpendicular to the conductors. The conductor slices so obtained are particularly suitable for interfacing between electronic devices having planar arrays of electrical contact pads.

Claims

1. A method of fabricating an anisotropic elastomeric conductor, said method comprising:

forming a stack of first and second sheets so that at least one second sheet lies between adjacent first sheets, wherein said first sheets include electrically conductive fibers running in one direction only and the second sheets are composed of electrically insulating material;

perfusing the stack with a curable elastomeric resin; and

curing the elastomeric resin to form a solid block having the electrically conductive fibers electrically isolated from one another and extending from one side of the block to the opposite side.

2. A method as in claim 1, further comprising the step of slicing the solid block in a direction transverse to the direction of the electrically conductive fibers to yield individual slices having the fibers extending thereacross.

3. A method as in claim 2, further comprising the step of dissolving at least a part of the electrically insulating material in the individual slices in order to introduce voids into the slice to allow for compressibility.

4. A method of fabricating an anisotropic elastomeric conductor, said method comprising:

forming a stack of first and second sheets so that at least one second sheet lies between adjacent first sheets, wherein said first sheets are fabric woven from electrically conductive fibers running in one direction and electrically insulating fibers running in the transverse direction and the second sheets are fabric woven entirely from electrically insulating fibers;

perfusing the stack with a curable elastomeric resin so that said resin permeates the interstices in the woven fabrics of the first and second sheets;

curing the elastomeric resin to form a solid block having the electrically conductive fibers electrically isolated from one another and extending from one side of the block to the opposite side; and

slicing the solid matrix in a direction transverse to the direction of the electrically conductive fibers to yield individual slices having the fibers extending thereacross.

5. A method as in claim 4, wherein the first sheets are wire cloth woven from metal fibers and insulating fibers.

6. A method as in claim 5, wherein the metal fibers are selected from copper, aluminum, silver, gold, and alloys thereof.

7. A method as in claim 5, wherein the metal fibers are copper.

8. A method as in claim 4, wherein the second sheets are woven from natural cellulose fibers.

9. A method as in claim 4, wherein the second sheets are woven from synthetic polymeric fibers.

10. A method as in claim 4, wherein the stack is formed from alternate first and second sheets.

11. A method as in claim 4, further comprising the step of dissolving at least a part of the electrically insulating material in the individual slices in order to introduce voids into the slice to allow for compressibility.

12. An anisotropic elastomeric conductor formed according to the steps of:

(a) forming a stack of first and second sheets of woven material, said first sheets formed of electrically insulating material with spaced apart electrically conductive fibers extending therethrough in one direction only;

said second sheets composed of electrically insulating material;

said first and second sheets arranged so at least one second sheet is disposed between adjacent first sheets;

said first sheets arranged so said conductive fibers in all of said first sheets are oriented in one direction; and

(b) perfusing said stack with a curable elastomeric resin; and

(c) curing said elastomeric resin so as to form a solid block with said electrically conductive fibers electrically isolated from each other and extending from one side of the block to the opposite side.

13. The anisotropic elastomeric conductor of claim 12 further formed by the step of cutting said block at a direction perpendicular to said electrically conductive fibers so as to form at least one individual slice of conductor with said electrically conductive fibers extending therethrough.

14. The anisotropic elastomeric conductor of claim 13 further formed by the step of dissolving a fraction of said electrically insulating material so as to form voids in said slice of conductor.

15. The anisotropic elastomeric conductor of claim 13 wherein said slice of conductor is of the thickness in the range of 0.02 to 0.04 cm.

16. The anisotropic elastomeric conductor of claim 13 wherein electrically conductive fibers have a diameter in the range of 0.001 to 0.01 cm.

17. The anisotropic elastomeric conductor of claim 12 wherein said electrically conductive fibers have a diameter in the range from 0.001 to 0.01 cm.