Electric lamp and discharge devices – Cathode ray tube – Shadow mask – support or shield
Patent
1973-05-24
1976-10-26
Segal, Robert
Electric lamp and discharge devices
Cathode ray tube
Shadow mask, support or shield
313402, H01J 2907, H01J 3120
Patent
active
039886328
ABSTRACT:
A color cathode-ray tube having a phosphor screen including a pattern of red-emitting, blue-emitting and green-emitting phosphor deposits. Electron gun means generates first, second and third angularly spaced electron beams for exciting the phosphor elements. A parallax mask is disposed adjacent the screen and has a pattern of openings for causing the first, second and third electron beams to impinge exclusively on the red-emitting, blue-emitting and green-emitting phosphor deposits, respectively. The openings in the mask and the phosphor deposits are dimensioned relative to each other such that the beam spots formed through the mask openings and the respectively associated phosphor deposits have a relative dimensional difference which varies between the central portion and the peripheral portions of the screen from a condition in which the beam spots have a greater dimension than the associated phosphor deposits to a condition in which the beam spots have a dimension smaller than the associated phosphor deposits. The screen has light absorptive material between the phosphor deposits in at least those portions of the screen wherein the said beam spot dimension is larger than the associated phosphor deposit dimension.
REFERENCES:
patent: 3146368 (1964-08-01), Fiore et al.
patent: 3590303 (1971-06-01), Coleclough
patent: 3614503 (1971-10-01), Dietch
Coult John H.
Segal Robert
Zenith Radio Corporation
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