High density test probe with rigid surface structure

• US 5,785,538 A
• Filed: 05/01/1996
• Issued: 07/28/1998
• Est. Priority Date: 11/27/1995
• Status: Expired due to Term

• Current Assignee: GlobalFoundries, Inc.
• Original Assignee: International Business Machines Corporation
• Inventors: Lauro, Paul Alfred, Shih, Da-Yuan, Fogel, Keith Edward, Beaman, Brian Samuel, Norcott, Maurice Heathcote
• Primary Examiner(s): Paumen, Gary F.
• Assistant Examiner(s): TA, THO DAC
• Application Number:
  US08/641,667
• Time in Patent Office: 818 Days
• Field of Search: 439/91, 439/86, 439/66, 439/591, 439/65, 439/74, 439/71
• US Class Current: 439/91
• CPC Class Codes: G01R 1/07357 with flexible bodies, e.g. buckling beams
• 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: H05K 7/1061 co-operating by abutting

Abstract

The present invention is a structure for probing an electronic device. The structure has a layer of elastomeric material having a first side and a second side; a plurality of electrical conductors extending from the first side to the second side; each of the electrical conductors has a first end and a second end, the first end extends to the first side, the second end extends to said second side; a layer of dielectric material disposed on the first side; the first end of the plurality of electrical conductors extends into openings in the layer of dielectric material. More particularly, in the present invention, the second side is disposed in contact with a first surface of a substrate and the second ends of the electrical conductors are electrically connected to first electrical contact locations on the first surface.

Claims

1. A structure for probing an electronic device comprising:

a dielectric substrate having a plurality of first electrically conductive contact locations;

a layer of elastomeric material having a first side and a second side;

a plurality of electrical conductors extending from said first side to said second side;

each of said electrical conductors has a first end and a second end, said first end extends to said first side, said second end extends to said second side;

said second end of each of said electrical conductors is physically attached to at least one of the first contact locations;

a layer of dielectric material disposed on said first side;

said layer of dielectric material being free to move with respect to said dielectric substrate when said structure is moved towards said electronic device;

said first end of said plurality of electrical conductors extends into openings in said layer of dielectric material.

2. A structure according to claim 1, wherein there is a protuberance at said first end and a protuberance at said second end.

4. A structure according to claim 1, wherein there is a groove in said layer of elastomeric material at said first side between at least two of said electrical conductors.

5. A structure according to claim 1, wherein said layer of a dielectric material is a polymer material.

6. A structure according to claim 1, wherein said electrical conductors are wires.

7. A structure according to claim 1 wherein each of said second ends is physically attached to at least one of said contact locations by the same type of bond.

8. A structure according to claim 1, wherein in said second side is disposed in contact with a first surface of said dielectric substrate.

9. A structure according to claim 2, wherein said substrate has a second side, said second side has a plurality of second electrically conductive contact locations thereon, which are in electrical communication with said first electrically conductive contact locations.

10. A structure according to claim 9, further including pins electrical bond pads connected to said second electrically conductive contact locations.

11. A structure according to claim 1, further including a means for disposing said first ends in contact with electronic device contact locations on an electronic device being tested.

12. A structure according to claim 11, further including means for applying electrical signals to said plurality of electrical conductors.

3. A structure according to claim I, wherein there is an aperture in said layer of elastomeric material extending from said first surface to said second surface.

13. A probe for making electrical contact with a plurality of bond pads on an integrated circuit device comprising:

a first fan out substrate having a first surface;

said first surface having a plurality of electrically conductive contact locations;

said surface between said electrically conductive contact locations being a dielectric material;

a plurality of bonds physically attached to said plurality of contact locations;

a plurality of wires extending outward from said bonds, away from said first surface on the fan out substrate;

said wires having ends disposed away from said first surface;

a layer of elastomeric material surrounding said plurality of wires, said layer of elastomeric material having a first side and a second side, said second side of the layer of elastomeric material is disposed on said first surface of the fan out substrate;

a layer of dielectric material is disposed on said first side of the layer of elastomeric material, said layer of dielectric material having a plurality of openings through which said ends of said plurality of wires extend, said layer of dielectric material being free to move with respect to said bond pads electrically conductive contact locations when said probe is moved towards said integrated circuit device.

14. A probe according to claim 13, further including a slit in said polymer material to decouple adjacent rows of probes.

15. A probe according to claim 13 where said wires are physically attached to said bonds by the same type of bond.

16. A probe according to claim 13, wherein said layer of dielectric material is a sheet of polymer material, and wherein said plurality of openings correspond to said plurality of said bonds.

17. A probe according to claim 16, further including a cavity in said sheet of polymer material and said layer of dielectric material to decouple a first array of probes from a second array of probes.