Method for manufacturing a shadow mask

Details Method for manufacturing a shadow mask Method for manufacturing a shadow mask

1991-01-08

1992-12-01

Seidel, Richard K.

Electric lamp or space discharge component or device manufacturi

Process

Electrode making

445 37, 148230, 148222, H01J 920, C21D 600, C21D 602

Patent

active

051675579

ABSTRACT:
A method for manufacturing a shadow mask is used for color television picture tubes and the like. The surface of a shadow mask body, made of Fe-Ni type alloy, is ion-nitriding processed so as to make the most of the low thermal expansion property inherent in the alloy. The result is that the color purity degradation caused by the thermal expansion at temperature increases of the mask, and by the resonance of the mask itself, can be prevented, thereby realizing a shadow mask serving to render a highly refined CRT.

REFERENCES:
patent: 1930388 (1933-10-01), Hatfield
patent: 1950549 (1934-03-01), Fry et al.
patent: 4306172 (1981-12-01), Matsukura et al.
patent: 4612061 (1986-09-01), Suzuki et al.
JP-55-125267 (A) English Abstract (Sep. 1980).

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