Patent ID: 6533399
Filing Date: 2003-03-18
Classification: B41J

Abstract:
A bubble-jet type ink-jet printhead comprising:a substrate integrally having an ink chamber, wherein the ink chamber has a substantially hemispherical shape, on its surface, in which ink to be ejected is filled, a manifold for supplying ink on a bottom side of the substrate, and an ink channel linking the ink chamber and the manifold at the bottom of the ink chamber; a nozzle plate on the substrate, the nozzle plate having a nozzle at a location corresponding to a central portion of the ink chamber; a heater formed in an annular shape on the nozzle plate and centered around the nozzle of the nozzle plate; an electrode, electrically connected to the heater, for applying current to the heater; and a curved bubble formation guide in the ink chamber and adjacent to the heater.