Pretreatment process for flat tension mask

Details Pretreatment process for flat tension mask Pretreatment process for flat tension mask

1986-12-31

1988-07-12

Ramsey, Kenneth J.

Electric lamp or space discharge component or device manufacturi

Process

With assembly or disassembly

445 47, 445 45, H01J 900, H01J 2907

Patent

active

047567023

ABSTRACT:
A process for pre-treating a metal foil shadow mask is disclosed for use in a cathode ray tube wherein the shadow mask is maintained under high tension within said cathode ray tube, and wherein the mask is subjected to predetermined relatively high temperatures during tube manufacture. The process according to the invention comprises pre-heating the shadow mask in a predetermined cycle of temperature and time effective to minimize subsequent permanent dimensional changes in the mask that occur when it is subjected to the predetermined relatively high temperatures, but ineffective to significantly reduce the tensile strength of the mask by annealing.

REFERENCES:
patent: 2625734 (1953-01-01), Law
patent: 3390447 (1968-07-01), Mears
patent: 3809945 (1974-05-01), Roeder
patent: 3867207 (1975-02-01), Decker et al.
patent: 3894321 (1975-07-01), Moore
patent: 4210843 (1980-07-01), Avadani
patent: 4528246 (1985-07-01), Higashinakagawa
patent: 4591344 (1986-05-01), Palac

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