Patent ID: 7150518
Filing Date: 2006-12-19
Classification: B41J

Abstract:
1. An inkjet head comprising: a flow path unit including pressure chambers arranged along a plane, and which is connected to nozzles respectively; and an actuator unit fixed to a surface of the flow path unit, which changes volume of each of the pressure chambers, the actuator unit including: the flow path unit includes at least one overhang portion provided in the pressure chambers and formed in such a manner that at least amount of protrusion of each side wall of each pressure chamber in a direction along the plane at a top height level as the height nearest to the actuator unit is larger than an amount of protrusion of each of side walls of each pressure chamber in the direction along the plane at any height level different from the top height level on an assumption that the height level is virtually provided in a direction from the pressure chamber to the actuator unit, and each sub electrode region is disposed between a position where a center of the sub electrode region at least partially overlaps an outer edge of a corresponding overhang portion on a side facing the pressure chamber at the top height level and a position where the sub electrode region does not overlap a corresponding overhang portion at the top height level but an outer edge of the sub electrode region overlaps an outer edge of a corresponding overhang portion on a side not facing the pressure chamber.