Patent ID: 7666322

Claim:
A method of producing a nozzle plate, the method comprising: a step for providing a substrate and a masking material which has a mask hole row group formed in the masking material and including a plurality of mask hole rows each of which is formed of a plurality of mask holes arranged in a first direction and which are aligned in a second direction orthogonal to the first direction; a masking material moving step for moving the masking material to a position above a predetermined position on a surface of the substrate; and a nozzle row group forming step for performing a laser irradiation sub-step for irradiating a laser onto the surface of the substrate from a side of a surface of the masking material opposite to the substrate, and forming, in the substrate, a plurality of nozzle row groups including a plurality of nozzle rows each of which has a plurality of nozzles arranged in an array in the first direction and which are aligned in the second direction, wherein in the laser irradiation sub-step, the laser is irradiated with a uniform energy density over a predetermined area and all of the mask holes in the masking material are accommodated in the predetermined area, and in the masking material moving step, the masking material and a laser irradiation source which irradiates the laser are moved while maintaining a mutual positional relationship of the masking material and the laser irradiation source.