Patent ID: 8042919

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