Cathode ray tube having shadow mask

Details Cathode ray tube having shadow mask Cathode ray tube having shadow mask

1992-04-28

1993-02-23

DeMeo, Palmer C.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313407, H01J 2907

Patent

active

051893347

ABSTRACT:
A shadow mask for use in a color cathode ray tube includes an electron beam transmissive domed plane disposed substantially perpendicular to an electron beam path. The domed plane comprises a central apertured area which has a predetermined pattern of electron beam transmissive apertures chemically etched thereon. An unapertured border is formed along the periphery of the central apertured border and a skirt portion is formed along the periphery of the unapertured border. The skirt portion and the unapertured order include a plurality of stripe type grooves which are formed on top and bottom surfaces of both the unapertured border and the skirt portion and which are alternately configured and formed by a chemical etching process. The chemically etched plurality of stripe type grooves are provided to eliminate the problem of spring-back when the domed plane is press-formed into a domed shape.

REFERENCES:
patent: 3855493 (1974-12-01), Snook et al.
patent: 4437036 (1984-03-01), Ragland, Jr.
patent: 4562377 (1985-12-01), Kamohara et al.

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