Probe cards employing probes having retaining portions for potting in a retention arrangement
View Patent ↗Method and apparatus using a retention arrangement with a potting enclosure for holding a plurality of probes by their retention portions, the probes being of the type having contacting tips for establishing electrical contact with pads or bumps of a device under test (DUT) to perform an electrical test. The retention arrangement has a top plate with top openings for the probes, a bottom plate with bottom openings for the probes, the plates being preferably made of ceramic with laser-machined openings, and a potting enclosure between the plates for admitting a potting agent that upon curing pots the retaining portions of the probes. In some embodiments a spacer is positioned between the top and bottom plates for defining the potting enclosure. Alternatively, the retention arrangement has intermediate plates located in the potting enclosure and having probe guiding openings to guide the probes.
1. A method for electrical testing of a device under test using a plurality of probes each having a connect end for applying a test signal, at least one arm portion and a contacting tip for making an electrical contact with said device under test, said method comprising:
a) providing a retaining portion in each of said probes;
b) providing a retention arrangement for holding each of said probes by said retaining portion;
c) creating a potting enclosure in said retention arrangement; and
d) admitting a potting agent into said potting enclosure for potting said retaining portion of said probes.
2. The method of claim 1 , wherein said potting enclosure is defined between opposite plates having openings for said probes.
3. The method of claim 2 , further comprising laser machining said openings.
4. The method of claim 2 , further comprising placing a number of intermediate plates having probe guiding holes for said probes in said potting enclosure, whereby sufficient inter-plate spacing is maintained to admit said potting agent therebetween.
5. The method of claim 1 , further comprising:
a) providing an admission opening in said potting enclosure for receiving said potting agent; and
b) pouring in said potting agent through said admission opening.
6. The method of claim 1 , further comprising providing a space transformer for contacting said probes and applying said test signal at said connect end.