A printhead assembly includes a carrier including a substrate and a substructure joined to a first surface of the substrate, and a plurality of printhead dies each mounted on a second surface of the substrate. The first surface of the substrate includes a surface deformation and the substructure is joined...http://www.google.com.au/patents/US6679581?utm_source=gb-gplus-sharePatent US6679581 - Surface deformation of carrier for printhead dies
