Color picture tube having a face panel with an outer face having

Details Color picture tube having a face panel with an outer face having Color picture tube having a face panel with an outer face having

1987-01-20

1988-10-11

Moore, David K.

Electric lamp and discharge devices

Cathode ray tube

Screen

313477R, 313408, 220 21A, H01J 2910, H01J 2986

Patent

active

047774010

ABSTRACT:
In a color picture tube, curvature of outside face of said face panel is defined by ##EQU1## wherein Z is a distance in a direction of tube axis from an X-Y plane tangential at the center of the face, r is a distance from the center of the face panel to said point therealong, and A and B are constants of positive integers, respectively; thus the face panel excludes point of inflection and the reproduced picture thereon has a flat appearance, without trouble of undesirable doming of shadow mask.

REFERENCES:
patent: 4535907 (1985-08-01), Tokita et al.
patent: 4537322 (1985-08-01), Okada et al.
patent: 4570101 (1986-02-01), Campbell
National Technical Report (Japan), vol. 33 No. 2, Kitagawa et al., "Hyperbolic Flat Art Color Picture Tube Series," pp. 153-167, 4/87.
National Technical Report (Japan) vol. 33 No. 2, Adachi et al., "43-Inch Super-Large Color CRT", pp. 168-175, 4/87.

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