Patent ID: 8382702

Claim:
A fluid injection device comprising: an injection nozzle through which fluid is ejected; a fluid chamber connected with the injection nozzle, wherein the fluid to be ejected is supplied to the fluid chamber; a fluid pressurizing and supplying unit which pressurizes the fluid and supplies the pressurized fluid to the fluid chamber; a volume varying unit which deforms in response to a driving voltage applied to the volume varying unit to vary a volume of the fluid chamber; a driving voltage applying unit which applies the driving voltage having a predetermined voltage waveform to the volume varying unit with fluid supplied to the fluid chamber; and a memory unit which stores pressure fluctuation data associated with fluid pressurized and supplied to the fluid chamber, wherein the fluid pressurizing and supplying unit is a unit which pressurizes and supplies fluid to the fluid chamber with pressure fluctuations generated during supply of the pressurized fluid, the driving voltage applying unit applies the driving voltage to the volume varying unit, wherein the driving voltage applying unit compensates the driving voltage by changing the voltage waveform based on the pressure fluctuation data stored in the memory unit, and a time interval between the voltage waveform produced by the driving voltage applied a first time and the voltage waveform produced by the driving voltage applied a second time when the pressure fluctuation data is lower than a predetermined pressure is longer than the time interval between the voltage waveform produced by the driving voltage applied the first time and the voltage waveform produced by the driving voltage applied the second time when the pressure fluctuation data is higher than the predetermined pressure.