US Patent 7252370 Inkjet printing head

An inkjet printing head includes: an actuator unit; and a flow path unit onto whose surface the actuator unit is fixed, the flow path unit including: a common ink chamber having a plurality of outlets; a plurality of individual ink flow paths having a plurality of pressure chambers of which the volumes are changed by the actuator unit, the individual ink flow paths for leading ink from the respective outlets of the common ink chamber to respective nozzles through respective pressure chambers, the pressure chambers arranged along a plane in a form of matrix and each connected to the respective nozzles; and a plurality of adjustment portions provided at a side opposite to the actuator unit with respect to the pressure chambers and adjust compliances of each of the pressure chambers to be equalized.