Patent ID: 7837820

Claim:
A process for manufacturing a liquid-discharging head including a substrate provided with a discharging device for discharging liquid and a supply port for supplying liquid to the discharging device, the process comprising: preparing a wafer having a first face on which the discharging device is disposed, a second face which is a rear face of the first face, and a plurality of the supply ports are disposed such that they penetrate the first face and the second face; joining the second face and a layer where a portion irradiated with light is enabled to cure such that the layer covers an opening of the supply port in the second face; irradiating a first portion of the layer corresponding to the opening and a second portion of the layer corresponding to an area of the layer between the plurality of the openings with light, wherein the amount of light energy irradiated on the first portion per unit area is smaller than the amount of light energy irradiated on the second portion per unit area; and cutting the wafer at a position of the area to define the substrate, providing a cut position of the wafer with water.