Patent ID: 6043595
Filing Date: 2000-03-28
Classification: H01J

Abstract:
A shadow mask, comprising:a curved-surface section formed by working a metal sheet and having the shape of a curved surface; anda skirt section surrounding the curved-surface section throughout a circumference of the curved-surface section,the curved-surface section including a perforated portion provided with a plurality of electron beam apertures and a nonperforated peripheral edge portion situated on the outer periphery of the perforated portion,each of the electron beam apertures having a larger hole opening on a convex surface side of the perforated portion and a smaller hole opening on a concave surface side of the perforated portion,the perforated portion having a plurality of compressed, strengthening dents formed in one surface thereof by compressing the perforated portion in the thickness direction thereof,wherein the plurality of compressed strengthening dents radially extend substantially from the center of the perforated portion to the peripheral edge thereof.