Patent ID: 7891064

Claim:
A method of manufacturing a piezoelectric inkjet head, comprising: (a) preparing an upper substrate, a middle substrate, and a lower substrate, which are formed of silicon; (b) forming an ink inlet and a plurality of pressure chambers to be filled with ink to be ejected by finely processing the upper substrate; (c) forming a manifold connected to the ink inlet, a plurality of restrictors that connect the manifold to the pressure chambers, and a plurality of first dampers in locations corresponding to the pressure chambers by finely processing the middle substrate; (d) forming a plurality of nozzles to eject the ink by finely processing the lower substrate; (e) bonding the lower substrate, the middle substrate, and the upper substrate by sequentially stacking them; and (f) forming a plurality of piezoelectric actuators that provide a driving force to eject ink on the upper surface of the upper substrate, wherein (c) comprises forming a membrane under the manifold to mitigate a rapid pressure change in the manifold using a material different from the material used to form the middle substrate, and (c) or (d) comprises forming a cavity located under the membrane and at least one venting channel that connects the cavity to the outside on the lower surface of the middle substrate or the upper surface of the lower substrate.