| 摘要 |
PROBLEM TO BE SOLVED: To provide an ink jet device capable of solving in a simple structure a problem of accumulation of a residual electric charge on a protection layer and of achieving stable ejection. SOLUTION: A voltage applying means 8 for applying, across a diaphragm 11 and a substrate layer 25 of an individual electrode substrate 2, a voltage of which the pole is different from that of a voltage to be applied across the diaphragm 11 and an individual electrode 21 by a driving means 7. In terms of the voltage applying means 8, the voltage of the individual electrode 21 in a condition that a switch array in the driving means 7 is in an ON state is determined by a driving signal. When the switch array is in an OFF state, the individual electrode 21 becomes a floating condition (a high impedance condition) and the individual electrode 21 has a voltage which is obtained such that the voltage of the voltage applying means 8 is divided by a capacity between the individual electrode 21 and the diaphragm 11 and a capacity between the individual electrode 21 and the substrate layer 25. As the poles of the driving means 7 and the voltage applying means 8 are different from each other, a reverse electric field is applied to the individual electrode 21 and the diaphragm 11 so that it is possible to suppress the accumulation of the residual electric charge. It is not necessary to directly apply a voltage having a reverse pole to the individual electrode 21, thereby simplifying the structure.
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