A driving method of an ink-jet head

摘要

An ink-jet head is formed by partitioning a plurality of ink chambers consisting of piezoelectric members from each other. Ink chambers (17) which emit ink and dummy ink chambers (18) which do not emit ink are arranged alternately, and an ink is supplied to the ink chambers from a common ink chamber. This ink head is used to perform sequentially emission of an ink drop from the ink chambers for a plurality of times, to achieve gradation printing, while the emission speed of the ink drops is gradually increased such that ink drops emitted later are merged with ink drops emitted earlier thereby to form one-dot liquid drop. In this case, where adjacent ink chambers with a dummy ink chamber inserted therebetween are simultaneously driven, timings of drive pulse voltages q1 and q2 applied to both of the adjacent ink chambers are shifted from each other such that the pressure in one of the adjacent ink chambers is decreased when the pressure in the other of the adjacent ink chamber is increased.