Patent ID: 7142397

Claim:
A flex circuit assembly for use in a head stack assembly, the flex circuit assembly comprising a flex circuit base film; an integrated circuit device including a top surface and a bottom surface, the bottom surface disposed adjacent the flex circuit base film and including a solder bump connection; an electrically conductive trace disposed upon the flex circuit base film, the trace including a contact pad, the contact pad electrically connected to the solder bump connection; a flex circuit cover film disposed upon the flex circuit base film, the flex circuit cover film including an opening, the integrated circuit device and the electrically conductive trace being disposed within the opening; an underfill portion disposed between the flex circuit base film and the integrated circuit device within the opening for attaching the integrated circuit device to the flex circuit base film, the underfill portion being formed of an underfill material, the electrically conductive trace including uncovered portions that are not covered by any of the integrated circuit device and the underfill portion within the opening; and a glob top portion disposed upon the underfill portion and the flex circuit base film and completely covering the uncovered portions of the electrically conductive trace, the glob top portion not being disposed upon the top surface of the integrated circuit device, the glob top portion being formed of a glob top material, the glob top material being different than the underfill material.