Patent ID: 7473520

Claim:
A method for manufacturing an ink jet head including an ink discharge port for discharging ink, an ink flow path communicated with said ink discharge port and an energy generating element for generating energy for discharging the ink, the method comprising the steps of: (1) providing said energy generating element on a substrate; (2) forming a photosensitive resin composition layer on said substrate on which said energy generating element was provided to coat said energy generating element, wherein, in said photosensitive resin composition layer, an inter-molecule bridging reaction proceeds by irradiation of an ionization radiant ray having a first wavelength band and a molecule decaying reaction proceeds by irradiation of an ionization radiant ray having a second wavelength band different from the first wavelength band; (3) irradiating the ionization radiant ray having the first wavelength band on a predetermined portion of said photosensitive resin composition layer; (4) forming an ink flow path pattern by removing a portion of said photosensitive resin composition layer which is not irradiated by the ionization radiant ray having the first wavelength band, by means of a developing process; (5) forming a coating resin layer constituting an ink flow path wall on said substrate on which said ink flow path pattern was formed; (6) forming said ink discharge port in a portion of said coating resin layer which is disposed above said energy generating element; (7) irradiating the ionization radiant ray having the second wavelength band onto said photosensitive resin composition layer forming said ink flow path pattern; and (8) forming said ink flow path communicated with said ink discharge port, by dissolving and removing the portion of the photosensitive resin composition layer which was irradiated by the ionization radiant ray having the second wavelength band.