Patent ID: 7699442

Claim:
A piezoelectric inkjet printhead, comprising: a manifold; a chamber array including a plurality of chambers to communicate with the manifold and arranged along at least one side of the manifold; at least one vibrating plate to cover the plurality of chambers; and a plurality of piezoelectric actuators formed on the at least one vibrating plate to change pressures of corresponding ones of the chambers by vibrating the at least one vibrating plate, wherein the plurality of chambers includes a plurality of pressure chambers disposed in a center portion of the chamber array and having corresponding ink ejecting nozzles, and at least one dummy chamber disposed on a side portion of the chamber array and having a corresponding dummy nozzle which does not eject ink, wherein the at least one dummy chamber allows a reverse flow of ink from the at least one dummy chamber to the manifold but does not eject the ink through the corresponding dummy nozzle when at least one of the piezoelectric actuators corresponding to the at least one dummy chambers operates.