Piezoelectric inkjet printhead

A piezoelectric inkjet printhead, comprising:

• a manifold;
• 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.

A piezoelectric inkjet printhead, comprising:

• a flow channel plate;
• a vibrating plate to form a manifold, a pressure chamber, and a dummy chamber with the flow channel plate;
• and
• a plurality of actuators disposed to control the pressure chamber to generate a first back flow of ink toward the manifold and to control the dummy chamber to generate a second back flow of ink toward the manifold.