Patent ID: 7735979

Claim:
A head for an ink-jet printer which jets an ink on a recording medium, the head comprising: a cavity unit comprising: a plurality of nozzle holes; a plurality of pressure chambers arranged on a plane which communicate with the nozzle holes respectively; a manifold which stores the ink to be supplied to the pressure chambers; communication channels which are formed separately to correspond to the pressure chambers, respectively, and in each of which a first communicating portion communicating with a corresponding one of the pressure chambers, a second communicating portion communicating with the manifold, and a turning portion between the first communicating portion and the second communicating portion are formed; and an energy imparting mechanism which imparts a jetting energy to the ink in the pressure chambers, wherein the pressure chambers have an elongated shape; and each of the communication channels comprises a first straight portion which is extended in a longitudinal direction of one of the pressure chambers from the first communicating portion, and a second straight portion which is extended parallel to the first straight portion from the second communicating portion, wherein the turning portion communicates with a front end of the first straight portion and a front end of the second straight portion.