Patent ID: 7129730

Claim:
A probe card assembly comprising: a PCB; a probe head having a contact surface, a back surface and a plurality of first through holes; a plurality of probes formed on the contact surface; an interconnect pad formed on the back surface and electrically connected to the probe; an interposer disposed between the probe head and the PCB, the interposer having a first surface, a second surface and a plurality of second through holes, the interposer includes at least a first pad on the first surface and at least a via under the corresponding first pad; a plurality of bumps bonded onto the first pad; and a probe head carrier for jointing the probe head with the interposer; a plurality of Z alignment screws connected to the PCB; a plurality of guide pins disposed between the probe head carrier and the Z alignment screws; the probes being configured for the testing of a wafer, wherein when the probe head carrier is assembled to the PCB by the probe head carrier, the interposer is disposed between the PCB and the probe head, the guide pins pass through the first and second through holes, and the bumps electrically contact the interconnect pad, wherein the probe head carrier includes a plurality of Y alignment screw for adjusting a Y position of the interposer and a plurality of X alignment screws for adjusting an X position of the interposer.