Patent ID: 7651203

Claim:
A droplet ejecting device comprising: a nozzle unit formed with a plurality of nozzles configured to eject ink droplets; a piezoelectric member formed with a plurality of piezoelectric elements provided in one-to-one correspondence with the plurality of nozzles, each of said piezoelectric elements having a common electrode and a discrete electrode, and is polarized based on a polarization voltage applied between the common electrode and the discrete electrode, and expands and contracts based on change in a voltage difference between the common electrode and the discrete electrode, wherein a first differentiation by polarization voltage of a characteristic curve indicating change in a polarization of the piezoelectric member with respect to change in the polarization voltage has a plurality of extremal values including a first extremal value at a prescribed positive voltage Vbp that is the smallest polarization voltage among plus polarization voltages corresponding to the plurality of extremal values, and a second extremal value at a prescribed negative voltage Vbn that is the largest polarization voltage among minus polarization voltages corresponding to the plurality of extremal values; and a drive voltage generating unit configured to generate a drive voltage having a range between a first negative voltage Ve 1 and a first positive voltage Ve 2 , and apply the drive voltage between the common electrode and the discrete electrode, wherein Vbp, Vbn, Ve 1 , and Ve 2 are set such that Vbn<Ve 1 <0 and 0<Ve 2 <Vbp.