Patent ID: 7159969

Claim:
Ink jet printhead comprising: a plurality of nozzles and a corresponding plurality of heating elements, suitable for being selectively activated to produce the ejection of ink droplets through said nozzles, said nozzles being disposed facing the corresponding heating elements, the latter being housed in respective chambers suitable for containing ink, an active module made up of a thin wafer of silicon, bearing said plurality of heating elements and said respective chambers, said active module being also provided along its sides with a plurality of electrical contact pads connected to said heating elements and suitable for being soldered to an array of feeding wires, a support element for said active module, said support element consisting of a portion of a plate of rigid, isolating material, provided with a feeding duct for said ink, traversing the thickness of said support element, wherein said active module is machined while separate from said support element and subsequently mounted integrally and placed on said support element in such a way that said chambers are facing said feeding duct, a resin frame mounted on said support element and having the same thickness as said active module, said resin frame being provided with an aperture of a shape substantially complementary to the dimensions of said active module, suitable for accommodating said active module and also said feeding duct so at to define an ink store chamber communicating with the ejection chambers of said active module and with the corresponding feeding duct, and a lamina bearing said plurality nozzles, corresponding to said heating elements and to said chambers, said lamina being mounted in part above said frame and in part above said active module, but without covering the region of said electrical contact pads on said active module so as to allow soldering of them to said array of feeding wires, said lamina constituting also an upper closing wall for said chambers and for said communicating chamber.