Shadow mask

摘要

A cast ingot of an invar alloy is forged, hot-and cold-rolled, annealed and subjected to a controlled rolling to provide a shadow mask plate. An X-ray diffraction pattern is formed in an electron-beam hole-formation surface of the shadow mask plate, and a draft in a controlled rolling step is so controlled that the "g" value is 2 or more. The "g" value is given as g=(I1+I2)/I3 where I1=the X-ray diffraction integrated intensity at the {200} crystal faces; I2=the X-ray diffraction integrated intensity at the {111} crystal faces; and I3=the X-ray diffraction integrated intensity at the {220} crystal faces. The shadow mask plate is etched to provide shadow masks each having electron-beam holes formed therein, noting that one hole surface side which has greater {100} texture is used as a larger-diameter hole surface side.