Material and assemblies for tensioned foil shadow masks

Details Material and assemblies for tensioned foil shadow masks Material and assemblies for tensioned foil shadow masks

1988-12-20

1990-02-13

Wieder, Kenneth

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

420 96, H01J 2907

Patent

active

049009761

ABSTRACT:
A process and material is disclosed for use in the manufacture of a tensioned mask color cathode ray tube which includes a faceplate having on its inner surface a phosphor screen, and having on opposed sides of the screen a support structure for the mask. The process comprises providing an apertured foil shadow mask characterized by being composed of a nickel-iron alloy, and securing the foil mask to the support structure while under tension and in registration with the phosphor screen. The process is further characterized by the subjection of the foil mask to a thermal cycle to partially anneal the mask to a state in which the mask has favorable magnetic and mechanical properties. The partial anneal may be accomplished as a discrete step prior to installing the mask on the support structure, or accomplished during, or as a result of, a thermal cycle in the process of sealing the tube. The material comprises a nickel-iron alloy that displays, following treatment according to the invention, characteristics that make it uniquely suited for use as a shadow mask in tensioned mask color cathode ray tubes.

REFERENCES:
patent: 4210843 (1980-07-01), Avandani
patent: 4593224 (1986-06-01), Palac
patent: 4695761 (1987-09-01), Fendley
patent: 4704094 (1989-11-01), Stempfle

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