Patent ID: 7703895

Claim:
A piezoelectric inkjet printhead comprising: an upper substrate, including: an ink inlet; a manifold connected with the ink inlet; and a plurality of pressure chambers arranged along at least one side of the manifold, wherein the ink inlet passes through the upper substrate, and the manifold and the pressure chambers are formed in a lower surface of the upper substrate; a lower substrate disposed directly adjacent the upper substrate, the lower substrate including: a plurality of restrictors each connecting the manifold with one end of each of the pressure chambers; and a plurality of nozzles each being formed in a position of the lower substrate that corresponds to the other end of each of the pressure chambers to vertically pass through the lower substrate, wherein the plurality of restrictors are formed in an upper surface of the lower substrate; and a plurality of piezoelectric actuators, the piezoelectric actuators formed on the upper substrate and corresponding to the pressure chambers, wherein: each of the upper substrate and the lower substrate is a silicon substrate, and the upper substrate is stacked on the lower substrate, the upper substrate includes a first silicon layer and a second silicon layer stacked on each other, the manifold and the plurality of pressure chambers are formed in the first silicon layer, the second silicon layer serves as a vibration plate to be deformed by the piezoelectric actuator, a depth of each of the pressure chambers is substantially the same as a thickness of the first silicon layer, and a depth of the manifold is less than that of each of the pressure chambers.