Patent ID: 8049136

Claim:
A method for producing a metal mask for screen printing, comprising the steps of: forming an opening by irradiating a laser beam at predetermined positions on a surface at one side of a metal plate, such that the metal plate is melted at positions irradiated by the laser beam, to form openings passing through a thickness of the metal plate; and ejecting an abrasive onto the other surface of the metal plate after the openings are formed, wherein the abrasive ejected in the step of ejecting the abrasive is formed into a plate shape having a flat surface, with a maximum diameter of the flat surface thereof being in a range of 0.05 mm to 10 mm, and 1.5 to 20 times as a thickness of a flat shape thereof, and the abrasive with the flat shape is ejected at an incident angle of equal to or less than 80 degrees with respect to the other surface of the metal plate, and, at an ejection pressure of 0.01 MPa to 0.7 MPa or at an ejection speed of 5 m/sec to 150 m/sec, such that the ejected abrasive is slid along the other surface of the metal plate.