Patent ID: 6945636
Filing Date: 2005-09-20
Classification: B41J

Abstract:
1. An ink-jet head, comprising: a passage unit, elongated in a direction, including a nozzle plate unit having a nozzle plate in which nozzles are formed, and a main unit fixed on said nozzle plate unit in a laminating direction and having a plurality of pressure chambers, each of the plurality of pressure chambers having one end connected with a nozzle and an other end connected with an ink supply source, the plurality of pressure chambers arranged along a plane to neighbor each other; and a plurality of actuator units for changing a volume of said pressure chambers, the plurality of actuator units being fixed on a side of said main unit opposite to a side on which said nozzle plate unit is fixed so as to be arranged at a distance from each other in the direction in which the passage unit is elongated, each of the actuator units having a shape that extends over the pressure chambers, wherein a linear expansion coefficient of a material making said actuator units is smaller than that of a material making said main unit, and a linear expansion coefficient of a material making said nozzle plate unit is smaller than that of the material making said main unit.