Patent ID: 7985532

Claim:
A method of producing a liquid discharge head in which a discharge port for discharging a liquid and a liquid flow path communicated with the discharge port are provided, the method comprising the steps of: forming a first positive-type photosensitive material layer on a substrate; forming a second positive-type photosensitive material layer on the first positive-type photosensitive material layer, the second positive-type photosensitive material layer containing a light-absorbing agent absorbing light having a wavelength to which the first positive-type photosensitive material layer is photosensitive, the second positive-type photosensitive material layer being photosensitive to the light having the wavelength; forming a third positive-type photosensitive material layer on the second positive-type photosensitive material layer, the third positive-type photosensitive material layer being photosensitive to the light having the wavelength; exposing the third positive-type photosensitive material layer with the light having the wavelength; developing the third positive-type photosensitive material layer; exposing the second photosensitive material layer and the first positive-type photosensitive material layer with the light having the wavelength; developing the second photosensitive material layer and the first photosensitive material layer; forming a coating layer on the substrate so as to coat the first photosensitive material layer, the second photosensitive material layer, and the third photosensitive material layer, to which the development has been performed; forming the discharge port in the coating layer; and forming the flow path by removing the first photosensitive material layer, the second photosensitive material layer, and the third photosensitive material layer.