Patent ID: 8753800

Claim:
A process for producing an ejection orifice forming member including an ejection orifice having a counterbore shape, the process comprising the steps of: (1) forming a laminate comprising a first negative photosensitive resin layer that contains a first photoacid generator, and a second negative photosensitive resin layer that is formed on the first negative photosensitive resin layer and contains a second photoacid generator; (2) forming a first latent image and a second latent image on the first negative photosensitive resin layer and the second negative photosensitive resin layer, respectively, by collectively subjecting the first negative photosensitive resin layer and the second negative photosensitive resin layer to exposure; (3) performing a heat treatment after the exposure; and (4) forming the ejection orifice by a development treatment, wherein the first photoacid generator in the first latent image has an acid diffusion length greater than the acid diffusion length of the second photoacid generator in the second latent image.