Patent ID: 7178905

Claim:
A monolithic ink-jet printhead, comprising: a substrate, an ink chamber to be filled with ink to be ejected being formed on a front surface of the substrate, a manifold for supplying ink to the ink chamber being formed on a rear surface of the substrate, and an ink channel in flow communication between the ink chamber and the manifold; the ink chamber including: sidewalls formed to a predetermined depth from the front surface of the substrate for defining side surfaces of the ink chamber; and a bottom wall formed parallel to the front surface of the substrate at the predetermined depth from the front surface of the substrate for defining a bottom surface of the ink chamber; a nozzle plate formed on the front surface of the substrate, the nozzle plate including a plurality of passivation layers formed of an insulating material, a heat dissipating layer formed of a material having good thermal conductivity, the heat dissipating layer being stacked on the plurality of passivation layers, and a nozzle for ejecting ink out of the monolithic ink-jet printhead in flow communication with the ink chamber; a heater, which is disposed between adjacent layers of the plurality of passivation layers of the nozzle plate, the heater being positioned above the ink chamber and heating ink in the ink chamber; and a conductor, which is disposed between adjacent layers of the plurality of passivation layers of the nozzle plate, the conductor being electrically connected to the heater and delivering a current to the heater.