Assembly for electrically connecting a test component to a testing machine for testing electrical circuits on the test component
In one embodiment, the invention provides a test assembly for electrically connecting a test component to a testing machine for testing electrical circuits on the test component. The assembly comprises a contactor assembly to interconnect with the test component, a probe assembly to mechanically support the contactor assembly and electrically connect the contactor assembly to the testing machine, and a clamping mechanism comprising a first clamping member and a second clamping member, the clamping members being urged together to exert a clamping force to deform contactor bumps of an electrical connection between the probe assembly and the contactor assembly.
1. An assembly for electrically connecting a test component to a testing machine for testing electrical circuits on the test component, the assembly comprising:
a contactor assembly including a plurality of first conductors; a plurality of first terminals each connected to a respective one of the first conductors; a plurality of resilient interconnection elements each connected to a respective one of the first conductors and have ends to electrically contact the test component; and a support component to support the contact assembly;
an external interface component on the support component and comprising electrical connectors to make electrical connections with the testing machine;
a flexible substrate;
flexible second conductors on the flexible substrate and electrically connected to the external interface component;
a plurality of second terminals on the flexible substrate electrically connected to the flexible second conductors;
a plurality of conductive bumps disposed between the first and second terminals; and
a clamp comprising first and second clamping members to urge the first and second terminals towards each other and to deform the conductive bumps.
2. The assembly of claim 1 , wherein the first terminals each comprise a terminal body which has a flat contact.
3. The assembly of claim 2 , wherein the first clamping member comprises an elongate bar spanning more than one conductive bump.
4. The assembly of claim 3 , wherein the metal bar is a work-hardened metal of hardened steel.
5. The assembly of claim 3 , wherein the second clamping member comprises a fastening bolt to urge the metal bar towards the contact surfaces of each terminal body.
6. The assembly of claim 5 , further comprising an expander member in the clamp wherein the expander material is of a resilient material and is under compression and decompresses in a direction parallel to the fastening bolt to compensate for loss of clamping force caused by lengthening of the fastening bolt.
7. The assembly of claim 1 , wherein the conductive bumps are of gold.
8. The assembly of claim 1 , wherein the conductive bumps have a height of 60 micrometers and a width of 100 micrometers.
9. The assembly of claim 8 , wherein the expander member comprises silicon rubber.
10. The assembly of claim 4 , wherein the contactor assembly comprises an interposer, an electrical contactor, and a retaining component to retain the interposer in electrical contact with the electrical contactor, wherein the plurality of the first conductors and first terminals are located on the electrical contactor, the plurality of interconnection spring elements are located the interposer, and wherein the electrical contactor and the flexible substrate include fiducial markings thereon to facilitate alignment of the first and second terminals.
11. The assembly of claim 10 , wherein a coefficient of thermal expansion of the metal bar is matched to within 0.5 ppm/° C. of the coefficient of thermal expansion of the contactor substrate.
12. The assembly of claim 10 , wherein the electrical contactor and the interposer have complementary fiducial markings to facilitate alignment of the resilient interconnection elements with electrical contact element on the electrical contactor.
13. The assembly of claim 1 , wherein the resilient interconnection elements comprise springs.