Color picture tube and method for manufacturing the same

Details Color picture tube and method for manufacturing the same Color picture tube and method for manufacturing the same

1986-01-13

1987-11-24

Ramsey, Kenneth J.

Electric lamp or space discharge component or device manufacturi

Process

Electrode making

148 121, 148134, H01J 900

Patent

active

047086807

ABSTRACT:
A color picture tube comprises a shadow mask which is formed to, oppose at a small gap therefrom, a phosphor screen formed on the inner surface of a panel. The shadow mask comprises a sheet of a nickel-containing iron alloy which contains 0.1% by weight or less of manganese and having an austenite grain number of 7 or less both within and at surfaces of the sheet, the austenite grain number being defined by JIS G 0551 of the Japanese Industrial Standards. The iron alloy sheet is annealed in a vacuum of 10.sup.-1 Torr or less at a temperature of 1,000.degree. C. or higher prior to formation into the shadow mask.

REFERENCES:
patent: 3642595 (1972-02-01), Saul
patent: 3909311 (1975-09-01), Yamada et al.
patent: 4210843 (1980-07-01), Avadani
patent: 4271571 (1981-06-01), Tsuda et al.
patent: 4306172 (1981-12-01), Matsukura et al.
patent: 4536226 (1985-08-01), Ohtake et al.

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