Patent ID: 7985531

Claim:
A method of producing an ink jet head, the ink jet head including a substrate having an element, formed on one surface thereof, for generating energy utilized for discharging an ink through a discharge port, and a supply opening, formed so as to penetrate the substrate, for supplying the ink to the discharge port, the method comprising: providing the substrate which includes a through hole which forms the supply opening, and a layer that covers an opening of the through-hole on a side of the one surface of the substrate; forming a protective film so that the protective film covers a side wall of the through-hole and reaches the layer; depositing a photosensitive resin on the protective film; applying light from the side of the one surface of the substrate to pattern the photosensitive resin; and removing the protective film formed on a portion of the opening of the through-hole on the side of the one surface of the substrate, with the patterned photosensitive resin being used as a mask.