Patent ID: 7121650

Claim:
A piezoelectric ink-jet printhead, comprising: an upper substrate through which an ink supply hole, through which ink is supplied, is formed and a pressure chamber, which is filled with ink to be ejected and having two ends, is formed on a bottom of the upper substrate; an intermediate substrate on which an ink reservoir, which is connected to the ink supply hole and in which supplied ink is stored, is formed on a top of the intermediate substrate, and a damper is formed in a position which corresponds to one end of the pressure chamber; a lower substrate in which a nozzle, through which ink is to be ejected, is formed in a position which corresponds to the damper; and a piezoelectric actuator formed monolithically on the upper substrate and which provides a driving force for ejecting ink from the pressure chamber, wherein a restrictor, which connects the other end of the pressure chamber to the ink reservoir, is formed on at least one side of the bottom surface of the upper substrate and the top surface of the intermediate substrate, and the lower substrate, the intermediate substrate, and the upper substrate are sequentially stacked on one another and are adhered to one another, the three substrates being formed of a monocrystalline silicon substrate.