Patent ID: 6258496
Filing Date: 2001-07-10
Classification: H01J,Y10T

Abstract:
A stretched mask for a color picture tube, which is stretched on a frame, said stretched mask comprising:a low-carbon steel sheet containing, on a weight basis, not more than 0.03% of C, not more than 0.10% of Si, 0.10% to 0.60% of Mn, not more than 0.10% of P, not more than 0.10% of S, 100 ppm to 170 ppm of N, and incidental impurities as components other than iron, said low-carbon steel sheet being heat-treated at a temperature at which recrystallization does not take place, before said low-carbon steel sheet is provided with a resist pattern for forming apertures and subjected to etching to form apertures in said low-carbon steel sheet.