Patent ID: 7036913

Claim:
An ink-jet printhead, comprising: a substrate, an ink chamber to be filled with ink to be ejected being formed in a front surface of the substrate, a manifold for supplying ink to the ink chamber, the manifold being formed in a rear surface of the substrate, and an ink passage in flow communication with the ink chamber and the manifold, the ink passage being formed in the front surface of the substrate and being formed parallel to the front surface of the substrate; 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 metallic material having good thermal conductivity, and a nozzle in flow communication with the ink chamber; and a heater and a conductor, which are disposed between adjacent passivation layers of the nozzle plate, the heater being positioned on the ink chamber and heating ink in the ink chamber, and the conductor for applying a current to the heater, wherein the heat dissipating layer is thermally connected to the heater to dissipate heat from the heater.