| 摘要 |
An ink jet head for applying electrical pulses between diaphragms and electrodes to charge/discharge therebetween to transform the diaphragms to thereby eject ink drops from nozzle holes. Electrostatic actuators 50 constituted by scanning electrodes (60, 61 to 64) provided on a plurality of diaphragms respectively and counter electrodes (10, 11 to 1n) are arranged in a matrix. Scanning pulses (61a to 64a) synchronized with a clock (30a) are supplied to the scanning electrodes (61 to 64) sequentially, respectively. Driving pulses corresponding to printing data (11a to 1na) having opposite potential to that of the scanning pulses and being synchronized with the clock (30a) are supplied to the counter electrodes (11 to 1n). When a potential difference between any one of the scanning electrodes (60, 61 to 64) and corresponding one of the counter electrodes (11 to 1n) reaches a predetermined voltage V, the electrostatic actuator (50) with the potential difference is driven so as to eject an ink drop.
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