Patent ID: 7597422

Claim:
A head for ink-jet printer which discharge an ink, the head comprising: a cavity unit including a plurality of nozzles, a plurality of elongated pressure chambers communicating with the nozzles respectively, and a manifold storing the ink to be supplied to the pressure chambers; an actuator unit having individual surface electrodes which are formed corresponding to the pressure chambers, respectively; and land portions which are conducted to the individual surface electrodes respectively and which are formed, corresponding the pressure chambers respectively, such that a land portion among the land portions is formed between an individual surface electrode, among the individual surface electrodes and conducted with the land portion, and another individual surface electrode adjacent to the individual surface electrode; the actuator changing volume of the pressure chambers respectively, when driving signal is supplied to the individual surface electrodes respectively, so as to discharge the ink from the nozzles; and a flexible cable arranged to overlap with the actuator unit, and having a flexible and insulative substrate, a plurality of connection terminals which are formed on the substrate, and signal lines formed on the substrate and drawn from the connection terminals respectively; wherein: the land portions are electrically connected to the connection terminals, respectively; and three land portions, among the land portions, which are adjacent to one another in a short direction of the pressure chambers and on a signal-line drawn side at which the signal lines are drawn, are arranged at three positions different in a longitudinal direction of the pressure chambers respectively.