Patent ID: 7353604

Claim:
A method for manufacturing an inkjet head, comprising: producing a flow path unit that comprises a plurality of individual ink flow paths passing through pressure chambers and reaching nozzles for ejecting ink, respectively; producing an actuator unit that comprises a piezoelectric structure; bonding the actuator unit with the flow path unit to produce a bonded structure of the flow path unit and the actuator unit; measuring a frequency characteristic of impedance of the piezoelectric structure of the bonded structure in each of plural regions facing at least one of the pressure chambers; and determining whether or not the bonded structure is a good product on a basis of at least one of: (a) a distribution of (Faâˆ’Fr) in the plural regions where Fa represents antiresonance frequency of each region at which impedance of each region are maximal and Fr represents resonance frequency of each region at which impedance of each region is minimal; (b) a distribution of Fr in the plural regions; and (c) a distribution of Zr in the plural regions, where Zr represents impedance of each region at the resonance frequency of each region.