Patent ID: 8251502

Claim:
A liquid-jet head chip comprising: an actuator substrate comprising a plurality of liquid discharge flow paths for discharging a liquid and disposed parallel to and at a distance from each other, each of the liquid discharge flow paths being open on a surface of the actuator substrate; a cover plate substrate bonded onto the surface of the actuator substrate and having an opening portion that opens on a surface of the cover plate substrate on a side opposite to the actuator substrate, the opening portion comprising a concave portion and a plurality of through-holes extending from the concave portion through the cover plate substrate and communicating with the liquid discharge flow paths; and a structure having a flat surface and being disposed at an approximately constant distance from the surface of the cover plate substrate to which the actuator substrate is bonded, the structure being located at a position at which the opening portion of the cover plate substrate is substantially closed by the structure.