Patent ID: 7245137

Claim:
A test head assembly comprising: a probe card comprising a plurality of first contact areas; a contactor comprising a plurality of second contact areas; and an interposer comprising a plurality of first spring contact structures each contacting one of said first contact areas, and a plurality of second spring contact structures each contacting one of said second contact areas, wherein ones of said first spring contact structures are electrically connected through said interposer to ones of said second spring contact structures, wherein: one of said first spring contact structures comprises a pair of first contacts, both first contacts extending from a first surface of said interposer and contacting one of said first contact areas, or one of said second spring contact structures comprises a pair of second contacts, both second contacts extending form a second surface of said interposer and contacting one of said second contact areas; and wherein ones of said first contacts or said second contacts comprise a base and an integrally formed cantilevered beam lithographically formed to have a shape comprising a contour.