Patent ID: 7950781

Claim:
An inkjet head chip, comprising: an ink chamber for containing ink; a plurality of piezoelectric elements deformable by applying a voltage; a plurality of channels partitioned with the plurality of piezoelectric elements and disposed parallel to each other; a plurality of nozzle holes disposed in one end of the plurality of channels in a longitudinal direction for discharging an ink droplet toward a recording medium; and an actuator plate having the plurality of channels formed therein; wherein the actuator plate has a laminated structure in which at least a piezoelectric layer and a low-permittivity substrate layer are laminated together, the piezoelectric layer being formed of a piezoelectric material forming the plurality of piezoelectric elements, the low-permittivity substrate layer being formed of an insulating low-permittivity material having a lower permittivity compared with the piezoelectric material, and the insulating low-permittivity material being exposed on bottom surfaces of the plurality of channels; wherein the plurality of channels comprise a plurality of discharge channels that communicate with the respective nozzle holes and that communicate with the ink chamber through respective ink introduction holes, and a plurality of non-discharge channels that are arranged alternately in parallel with the discharge channels and in which supply of the ink from the ink chamber is interrupted; wherein one end of each discharge channel extends to an end surface of the actuator plate in a state in which the insulating low-permittivity material is exposed on a bottom surface thereof and another end of each discharge channel does not extend to the end surface of the actuator plate; and wherein each non-discharge channel extends over at least an entire length of the actuator plate in a state in which the insulating low-permittivity material is exposed on a bottom surface thereof.