Piezoelectric type liquid droplet ejecting device which compensates for residual pressure fluctuations

A piezoelectric-type liquid droplet ejecting device for ejecting a liquid droplet from a pressure chamber to print a dot during a printing operation, the pressure chamber having an internal volume defined by a plurality of walls for containing the liquid, comprising;

• a piezoelectric element associated with at least one wall of the plurality of walls for changing the internal volume of the pressure chamber by deforming the at least one wall of the plurality of walls in response to application of electric voltage;
• drive means for applying a predetermined voltage pulse to the piezoelectric element;
• piezoelectric residual pressure fluctuation detection means for detecting, during a continuation of the printing operation following the print of the dot, residual pressure fluctuation, the residual pressure fluctuation being generated in the pressure chamber by the application of the predetermined voltage pulse with a predetermined parameter to the piezoelectric element, the piezoelectric element deforming upon application of the predetermined voltage pulse;
• and
• residual pressure fluctuation compensating means, for determining a compensation voltage pulse based on the residual pressure fluctuation detected by the residual pressure fluctuation detection means and for applying the compensation voltage pulse to the piezoelectric element, the compensation voltage pulse deforming the piezoelectric element upon application thereto to compensate for residual pressure fluctuation in the pressure chamber.