METHOD OF DRIVING INK-JET HEAD

摘要

A method of driving an ink-jet head having the wall of an ink chamber deformed at least partially by a piezoelectric actuator to eject ink, wherein the ink is ejected by lowering the voltage applied to the piezoelectric actuator from the one in an initial state to increase the volume of the ink chamber so as to suck the ink and then sharply elevating the voltage to a predetermined value higher than the initial state voltage to reduce the volume of the ink chamber so as to eject the ink. After the predetermined voltage is maintained for a predetermined time, the applied voltage is lowered from the predetermined voltage to the initial state voltage to increase the volume of the ink chamber. The time taken for lowering the voltage reduced to one half of the surface tension vibration period of a meniscus formed by the ink ejection, and the voltage is lowered to a value at which a vibration whose amplitude corresponds to that of the surface tension vibration of the meniscus occurs in the vibration chamber.