| 摘要 |
PURPOSE:To efficiently produce a shadow mask having holes whose diameter and shape are nearly uniform by specifying the surface roughness of a thin plate of an Fe-Ni alloy, the average interval of ruggedness of the surface roughness and the aspect ratio of holes pierced in the thin plate. CONSTITUTION:The surface roughness Ra of a thin plate of an Fe-Ni alloy for a shadow mask is regulated to 0.2-0.7mum and the average interval Sm of the ruggedness of the surface roughness to <=100mum and the aspect ratio Re of holes pierced by etching is regulated to >=0.9. The grain size of the thin plate is also regulated to grain size No. >=8.0. Electron beam transmitting holes are pierced in the resulting thin plate by etching to obtain a high grade shadow mask having holes whose diameter and shape are nearly uniform.
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