Patent ID: 6984024

Claim:
A monolithic ink-jet printhead, comprising: a substrate having an ink chamber to be supplied with ink to be ejected on a front surface, a manifold for supplying ink to the ink chamber on a rear surface, and an ink channel in communication with the ink chamber and the manifold; a barrier wall made of a predetermined material different from a material of the substrate, formed on the front surface of the substrate to a predetermined depth in a perpendicular direction so as to form at least a portion of sidewalls of the ink chamber and defining at least a portion of the ink chamber in a width-wise direction; a nozzle plate including a plurality of material layers stacked on the substrate and having a nozzle penetrating the nozzle plate, so that ink ejected from the ink chamber is ejected through the nozzle; a heater formed between adjacent material layers of the plurality of material layers of the nozzle plate and located above the ink chamber for heating ink to be supplied within the ink chamber; and a conductor provided between adjacent material layers of the plurality of material layers of the nozzle plate, the conductor being electrically connected to the heater for applying current across the heater.