Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of individual circuit component or element
Reexamination Certificate
2007-12-25
2007-12-25
Nguyen, Vinh P. (Department: 2829)
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
Of individual circuit component or element
C324S760020
Reexamination Certificate
active
11428423
ABSTRACT:
A method and system for compensating for thermally induced motion of probe cards used in testing die on a wafer are disclosed. A probe card incorporating temperature control devices to maintain a uniform temperature throughout the thickness of the probe card is disclosed. A probe card incorporating bi-material stiffening elements which respond to changes in temperature in such a way as to counteract thermally induced motion of the probe card is disclosed including rolling elements, slots and lubrication. Various means for allowing radial expansion of a probe card to prevent thermally induced movement of the probe card is disclosed. A method for detecting thermally induced movement of the probe card and moving the wafer to compensate is also disclosed.
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Eldridge Benjamin N.
Grube Gary W.
Larder Richard A.
Mathieu Gaetan L.
Matsubayashi Ken S.
Burraston N. Kenneth
FormFactor Inc.
Nguyen Vinh P.
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