INK JET HEAD

摘要

When charging an actuator, first, the charging is performed by applying an intermediate voltage lower than a driving voltage which is a target voltage and then charging is performed by applying the driving voltage to the actuator. When discharging the actuator, the discharging is performed by applying the intermediate voltage and then the discharging is performed by applying a zero voltage to the actuator which is charged by the driving voltage. The time for applying the intermediate voltage at a timing of ejecting the ink from the nozzles is shorter than the time for applying the intermediate voltage to the actuator at other timings.

主权项

1. An ink jet head comprising:
a pressure chamber which is filled with ink; a capacitive-type actuator which changes capacitance of the pressure chamber by performing charging or discharging with a series of charging and discharging sequence; a plate having a plurality of nozzles which eject ink in the pressure chamber according to the change of the capacitance of the pressure chamber; a charging and discharging circuit which selectively charges or discharges the actuator depending on the input driving waveform; and a waveform generation circuit which outputs a driving waveform to the charging and discharging circuit so as to perform charging by applying an intermediate voltage lower than a driving voltage which is a target voltage and then perform charging by applying the driving voltage to the actuator, when charging the actuator, and to perform discharging by applying the intermediate voltage and then perform discharging by applying a zero voltage to the actuator which is charged by the driving voltage, when discharging the actuator, wherein the time for applying the intermediate voltage to the actuator at a timing of ejecting the ink from the nozzles is shorter than the time for applying the intermediate voltage to the actuator at other timings.