Patent ID: 7926153

Claim:
A method of producing a liquid ejecting head unit that has a plurality of liquid ejecting heads, each of the plurality of liquid ejecting heads having a fluid channel formation substrate, which has pressure generation chambers that are in communication with nozzle orifices through which liquid is ejected, and piezoelectric elements, each of which is made up of a lower electrode, a piezoelectric layer that has hysteresis characteristic in a polarization electric field, and an upper electrode, formed on the fluid channel formation substrate, the liquid ejecting head unit production method comprising: forming the plurality of ink-jet recording heads; acquiring coercive electric fields of the piezoelectric layers of the liquid ejecting heads; specifying a range of the coercive electric field for each of a plurality of ranks; classifying the liquid ejecting heads into the plurality of ranks; and assembling the liquid ejecting heads that belong to the same rank together in the liquid head unit.