Mask-focusing color picture tube

Details Mask-focusing color picture tube Mask-focusing color picture tube

1982-06-25

1985-03-05

Moore, David K.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313408, H01J 2907

Patent

active

045033552

ABSTRACT:
A mask-focusing color picture tube comprising an evacuated envelope; electron gun to generate a number of electron beams; a display screen comprising a large number of phosphor stripes luminescing in different colors; a plurality of shadow masks being spaced in the predetermined distance each other, individually having a number of apertures which is arranged in rows and being disposed in the vicinity of the screen, each electron beam being assigned to phosphor stripe of a respective color through the corresponding mask aperture. At least one of the plurality of shadow masks has a plurality of projections on at least one surface of the shadow mask. The projections are separated from each other by the rows of the apertures. At least part of the projections are located at nonsymmetrical positions with respect to the centers of the apertures.

REFERENCES:
patent: 2971117 (1961-02-01), Law
patent: 3502942 (1970-03-01), Khan et al.
patent: 3668002 (1972-06-01), Okabe et al.
patent: 3944867 (1976-03-01), Kaplan
patent: 4059781 (1977-11-01), Van Alphen et al.
patent: 4066923 (1978-01-01), Van Esdonk
patent: 4107569 (1978-08-01), Ronde
patent: 4112563 (1978-09-01), Van Esdonk
patent: 4379251 (1983-04-01), Brouha et al.

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