Patent ID: 8556391

Claim:
A liquid jet head, comprising: a nozzle plate having a nozzle for ejecting a liquid onto a recording medium; a piezoelectric plate having a first surface, an elongated groove formed in the first surface, and a second surface connected to the nozzle plate; and a cover plate having a liquid supply hole for supplying the liquid into the elongated groove of the piezoelectric plate, and having a liquid discharge hole for discharging the liquid through the elongated groove, the cover plate being disposed on the first surface of the piezoelectric plate; wherein a cross-section of the elongated groove of the piezoelectric plate in a longitudinal direction and a depth direction of the elongated groove is a convex shape; wherein the elongated groove is communicated, at a tip of the convex shape, to the nozzle; and wherein the elongated groove is communicated, in a bottom portion of the convex shape, to the liquid supply hole and the liquid discharge hole.