Blackening of non iron-based flat tensioned foil shadow masks

Details Blackening of non iron-based flat tensioned foil shadow masks Blackening of non iron-based flat tensioned foil shadow masks

1988-03-29

1989-12-05

Wieder, Kenneth

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313408, H01J 2907

Patent

active

048855014

ABSTRACT:
The power handling capacity of non iron-based flat tensioned foil shadow masks for flat faceplate cathode ray tubes (CRTs) is enhanced by providing the flat tensioned mask (FTM) with a thin outer layer of iron, which is converted to iron oxide by blackening, or heating. The iron layer, which is preferably at least 0.04 mil thick, is deposited on the FTM by electroplating in a ferrous ammonium sulfate bath either before or after chemical etching of the FTM. The thin iron layer increases FTM emissivity and reduces FTM doming at high electron beam energies. The iron coating may be blackened in the frit-like cycle during CRT assembly or in a separate heating operation. A blackened outer layer of cobalt may also be used to increase FTM emissivity.

REFERENCES:
patent: 4210843 (1980-07-01), Avandani
patent: 4664996 (1987-05-01), Moscony et al.
patent: 4734615 (1988-03-01), Koike et al.

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