Method of producing an ink jet apparatus and an organic el device

The ink storage portion for storing ink, the pressure applying part for applying a pressure to the ink in the ink accommodating portion by the piezoelectric element, the ink-jet head having nozzles for ejecting ink droplets from said ink containing portion, application of the piezoelectric element and a discharge control unit for controlling the discharge amount of the ink droplets by changing the voltage, the signal waveform of the applied voltage, pushes the nozzle-side the ink in the ink storage portion within a range not ejected from the nozzle It includes a preliminary vibration waveform section for performing preliminary driving operation, and a present oscillation waveform section for performing the driving operation for discharging the ink droplets from the nozzle after the preliminary driving operation, the discharge control unit applied voltage for running and the present drive operation and the preliminary driving operation based on the signal waveform of the applied voltage, to perform the preliminary driving operation And ink-jet apparatus that is configured such that the ratio of the voltage displacement amount Y of the applied voltage for performing the present drive operation voltage displacement X becomes 20% ≦ X / Y ≦ 40%.