Method of manufacturing picture tube shadow mask

Details Method of manufacturing picture tube shadow mask Method of manufacturing picture tube shadow mask

1985-03-12

1986-09-16

Silverberg, Sam

Metal treatment

Compositions

Heat treating

148 14, 445 47, 313402, C23C 810

Patent

active

046120610

ABSTRACT:
A method of manufacturing a picture tube shadow mask wherein a thin metal plate containing iron and nickel as major components is first etched to form a plurality of mask apertures, then, annealing of the metal plate is performed and, after being cooled in a reducing atmosphere, a darkened oxide layer is formed on the surface of the annealed metal plate by subjecting the metal plate at first to a relatively weak oxidizing steam atmosphere and then to a relatively strong oxidizing steam atmosphere.

REFERENCES:
patent: 3708351 (1973-01-01), Dallas
patent: 3925109 (1975-12-01), Nilsen
patent: 3935036 (1976-01-01), Kinsch
patent: 3967985 (1976-07-01), Izumi

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