Patent ID: 7267427

Claim:
A method of manufacturing an ink jet head, the ink jet head having a cavity that contains liquid and a nozzle that communicates with the cavity, and ejecting the liquid contained in the cavity from an ejection orifice of the nozzle with using a nozzle opening at an opposite side of the cavity as the ejection orifice, the method comprising: making an ejection orifice side of the nozzle have a taper portion in which a diameter increases progressively toward the ejection orifice side; forming lyophobic films and lyophilic films alternately on the taper portion inside the nozzle so as to form a stack film; and forming a lyophobic film inside the nozzle in which annular end surfaces of the lyophobic films and annular end surfaces of the lyophilic films are exposed alternately by grinding the stack film on the taper portion so as to expose a side section of the stack film.