Patent ID: 7497559

Claim:
A piezoelectric inkjet printhead comprising: an upper substrate, an intermediate substrate, and a lower substrate that are sequentially stacked, wherein: the upper substrate includes: piezoelectric actuators on an upper surface of the upper substrate; pressure chambers on a lower surface of the upper substrate, the lower surface of the upper substrate being substantially coplanar with lower surfaces of the pressure chambers; and first restrictors extending from the lower surfaces of the pressure chambers to upper surfaces of the pressure chambers, the first restrictors having a width smaller than a width of the pressure chambers, and the widths of the first restrictors and pressure chambers being measured alone a direction orthogonal to a lengthwise direction of the piezoelectric actuators, the intermediate substrate includes: dampers passing therethrough, the dampers corresponding to the pressure chambers; a manifold on a lower surface of the intermediate substrate, a bottom of the manifold being substantially coplanar with the lower surface of the intermediate substrate and with an upper surface of the lower substrate; and second restrictors extending between the first restrictors and the manifold, and the lower substrate includes: nozzles passing therethrough, the nozzles corresponding to the dampers.