Color picture tube having shadow mask with specific curvature an

Details Color picture tube having shadow mask with specific curvature an Color picture tube having shadow mask with specific curvature an

1984-05-31

1986-04-15

DeMeo, Palmer C.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313402, 313408, H01J 2907

Patent

active

045830223

ABSTRACT:
An improvement is made in a color picture tube having a slit-type shadow mounted therein in spaced relation to a cathodoluminescent line screen. For the mask, the spacing between adjacent aperture columns increases from center-to-edge as approximately the fourth power of the distance along from the center. Such fourth order spacing variation permits shaping of the shadow mask so that the contour of the mask along its major axis also varies as a function substantially of the fourth power of distance along from the center of the mask.

REFERENCES:
patent: 3590303 (1971-06-01), Coleclough
patent: 3633058 (1972-01-01), Kouno
patent: 3931906 (1976-01-01), Bradu
patent: 3947718 (1976-03-01), van Lent
patent: 4136300 (1979-01-01), Morrell
U.S. patent application Ser. No. 469,772, entitled, "Cathode-Ray Tube Having an Improved Shadow Mask Contour", filed on Feb. 25, 1983 by F. R. Ragland, Jr. (RCA 79,242A).
U.S. patent application Ser. No. 469,774, entitled, "Cathode-Ray Tube Having a Faceplate Panel with a Substantially Planar Periphery", filed on Feb. 25, 1983, by F. R. Ragland, Jr. (RCA 79,242).
U.S. patent application Ser. No. 469,775, entitled, "Cathode-Ray Tube Having Different Curvatures along Major and Minor Axes", filed on Feb. 25, 1983, by R. J. D'Amato et al. (RCA 79,235).
U.S. patent application Ser. No. 529,644, entitled, "Cathode-Ray Tube Having a Faceplate Panel with an Essentially Planar Screen Periphery", filed on Sep. 6, 1983 by R. J. D'Amato et al. (RCA 80,184).

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