Electric lamp and discharge devices – Cathode ray tube – Shadow mask – support or shield
Patent
1975-11-10
1976-09-07
Segal, Robert
Electric lamp and discharge devices
Cathode ray tube
Shadow mask, support or shield
313470, 313478, H01J 2932, H01J 3120
Patent
active
039796302
ABSTRACT:
In one embodiment, a standard dot-type shadow mask color picture tube is modified by (1) increasing the glass transmission of the faceplate, and/or the mask aperture size, to increase the screen brightness; (2) making the color phosphor dots smaller and coating the space between the dots with an opaque and non-reflecting black matrix, to maintain acceptable contrast; and making the color phosphor dots sufficiently larger than the mask apertures that the beam spots on the screen are smaller than the dots (positive tolerance), to facilitate manufacture of the screen; while maintaining good purity tolerance and smaller but acceptable white uniformity tolerance. In another embodiment, a line screen-line grille shadow mask color picture tube is similarly modified.
REFERENCES:
patent: 2752520 (1956-06-01), Morrell
patent: 2755402 (1956-07-01), Morell
patent: 2842697 (1958-07-01), Bingley
patent: 2947899 (1960-08-01), Kaplan
patent: 3146368 (1964-08-01), Fiore et al.
patent: 3223872 (1965-12-01), Raibourn
patent: 3358175 (1967-12-01), Morrell
patent: R26251 (1964-08-01), Kaplan
Bruestle Glenn H.
Irlbeck Dennis H.
RCA Corporation
Segal Robert
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