Patent ID: 7441868

Claim:
A nozzle plate in which a plurality of nozzles that eject ink droplets onto a recording medium are formed, the nozzle plate comprising: a base plate that forms a nozzle plate main body; a water-repellent plate laminated on a surface of the base plate and having water repellency; and the nozzles being formed by at least one of through holes formed in the base plate and the water-repellent plate and having continuous surfaces of joint portions of the base plate and the water-repellent plate in those through holes; the nozzles comprising first straight form portions provided in the through holes at the base plate side and having opening diameters constant toward an ink ejection direction and second straight form portions provided in the through holes at the water-repellent plate side and having opening diameters constant toward the ink ejection direction, the opening diameters of the first straight form portions being equal to the opening diameters of the second straight form portions; wherein counterbore portions having larger diameters than nozzle diameters are provided in parts corresponding to the nozzles on a surface of the water-repellent plate, and a thickness of the water-repellent plate is approximately 4 to 30 μm.