Patent ID: 7909438
Filing Date: 2011-03-22
Classification: B41J

Abstract:
1. A piezoelectric type inkjet printhead comprising: an upper substrate including a pressure chamber to be filled with ink, a reservoir to store ink flowing in from an ink container, a restrictor to connect the reservoir to one end of the pressure chamber: an intermediate substrate comprising a damper formed on a portion of the intermediate substrate to correspond to other end of the pressure chamber; a lower substrate comprising a nozzle to eject ink to correspond to the damper; a hydrophobic layer formed on a bottom of the lower substrate; and a piezoelectric actuator formed on the upper substrate to supply a driving power to the pressure chamber to eject ink through the nozzle, wherein the nozzle is formed in the lower substrate at a predetermined depth from the bottom surface of the lower substrate, wherein the nozzle comprises: an ink leading unit connected to the damper and leading ink; an ink ejecting hole connected to the ink leading unit through which ink is ejected; and an inclination portion formed inclined inwards at a predetermined angle at an entrance of the ink ejecting hole and connected to the bottom surface of the lower substrate.