Patent ID: 7669949
Filing Date: 2010-03-02
Classification: B41J

Abstract:
1. A liquid droplet ejecting apparatus comprising: a piezoelectric body that deforms and ejects liquid droplets as a result of a voltage being applied to the piezoelectric body and, when a superposed voltage, obtained by superposing a constant voltage of a constant voltage level and a waveform voltage of a sinusoidal waveform, is applied to the piezoelectric body, at least one of an electrostatic capacitance and a deformation amount of the piezoelectric body changes in response to the voltage level of the constant voltage; and a voltage applying unit that uses, as a reference voltage level, the voltage level of the constant voltage when the square of the deformation amount of the piezoelectric body divided by the electrostatic capacitance is at a maximum value, and that applies to the piezoelectric body, when the piezoelectric body ejects the liquid droplets, a drive voltage obtained by superposing a voltage of a predetermined drive waveform on the constant voltage that is within a predetermined range that includes the reference voltage level.