Inkjet apparatus and method for manufacturing organic EL device

摘要

An inkjet device includes an inkjet head having a pressure applier applying voltage to ink contained in a ink reservoir, by executing a standby drive operation of applying a standby oscillation to the ink and a main drive operation of applying a main oscillation to cause the ink to be discharged from nozzles, such that the start of main drive operation execution is within a period where the displacement in the standby oscillation is oriented toward the interior of the nozzles in order to produce interference between the standby oscillation.

主权项

1. An inkjet device, comprising:
an inkjet head having an ink reservoir storing an ink, a pressure applier applying pressure to the ink in the ink reservoir, and a nozzle discharging the ink from the ink reservoir as an ink drop; and a discharge controller controlling pressure application by the pressure applier, wherein the pressure applier executes the pressure application to perform:
a standby drive operation of applying a standby oscillation to the ink, an amplitude direction matching a discharge direction within a range that does not cause the ink to be discharged from the nozzle; anda main drive operation of applying a main oscillation to the ink, the amplitude direction matching the discharge direction within a range that causes the ink to be discharged from the nozzle, and the main drive operation being performed after the standby drive operation,the main drive operation is performed during a resonance state occurring after the standby drive operation and after application of a resonance oscillation causing resonance in the standby oscillation, a start time of the main drive operation occurs within a time interval where a displacement by the standby drive operation is oriented toward an interior of the nozzle, the pressure applier includes a piezoelectric element, the discharge controller controls the pressure application by the pressure applier by controlling a voltage signal applied to the piezoelectric element, a waveform of the voltage signal includes a standby oscillatory waveform portion for executing the standby drive operation, and a main oscillatory waveform portion for executing the main drive operation, the main oscillatory waveform portion includes a first period of changing voltage to apply the resonance oscillation, and a second period of changing voltage to apply the main oscillation, and a time interval X between the first period and the second period is set using a time T required for Helmholtz resonance, and satisfies −0.5T+2nT≦X≦0.5T+2nT (where n is a natural number including zero) with a value that is greater than zero.