Oliff & Berridge, PLC
System and method for ejecting ink droplets from a nozzle
 Ink ejection device including a polarized piezoelectric element having a natural shape and forming at least a portion of a wall of an ink chamber, the ink chamber having a length and a natural volume and being connected with the nozzle and filled with ink; an electrode formed on the piezoelectric element; and an LSI chip applying voltage to the electrode to deform the piezoelectric element so that volume of the ink chamber increases, whereupon a pressure wave that propagates through the ink at a velocity of one length of the ink chamber in a time interval is generated in the ink, and, upon completion of a predetermined duration of time defined as approximately the time interval multiplied by an odd number equal to or greater than three, stopping application of voltage to the electrode to return piezoelectric element to the natural shape. 
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Qiming
Zhang