Process for manufacturing shadow mask of Braun tube for color TV

Details Process for manufacturing shadow mask of Braun tube for color TV Process for manufacturing shadow mask of Braun tube for color TV

1979-10-11

1981-06-09

Lazarus, Richard B.

Metal working

Barrier layer or semiconductor device making

Barrier layer device making

H01J 902

Patent

active

042715717

ABSTRACT:
In process for manufacturing shadow mask of Braun tube for color TV comprising steps of subjecting strip of low carbon steel to cold rolling finish, forming holes in the rolled material, cutting it into individual flat masks, annealing each mask at elevated temperatures, conditioning the annealed mask and press-forming the mask into desired shape, the improvement residing in controlling the finish cold rolling reduction within the range between 10 and 35%, whereby the annealing temperature is reduced to 520.degree. to 750.degree. C. The process is applicable to steel strip material containing up to 0.10% by weight of carbon.

REFERENCES:
patent: 3693223 (1972-09-01), Kaplan
patent: 4210843 (1980-07-01), Avadani

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