Patent ID: 7874641

Claim:
A modular printhead assembly which comprises a substrate member; a plurality of printhead modules fastened to the substrate member, each printhead module comprising a layered structure through which at least differently colored inks are fed, the layered structure comprising at least a lower layer, a middle layer and a top layer, with the lower layer defining a number of channels in fluid communication with respective ink supplies, the middle layer defining a number of openings in fluid communication with the channels, and the top layer defining a number of channels on a bottom side and openings in a top side in fluid communication with the channels; a micro-electromechanical printhead integrated circuit mounted on the layered structure, the printhead integrated circuit comprising a plurality of micro-electromechanical nozzles arranged on a silicon layer, the silicon layer defining a plurality of ink channels for feeding ink to the nozzles, the openings in the top layer being substantially aligned with the ink channels; and an ink supply arranged on the substrate member and in fluid communication with the channels in the bottom layer through openings in the substrate member.