Color cathode-ray tube

Details Color cathode-ray tube Color cathode-ray tube

1994-02-15

1995-05-16

Yusko, Donald J.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313408, 313477R, H01J 2907

Patent

active

054163790

ABSTRACT:
A color cathode-ray tube includes a curved shadow mask formed having a number of apertures and a substantially rectangular effective surface facing the inner surface of the panel. The effective surface of the shadow mask has a center through which the tube axis passes, a horizontal axis passing through the center and at right angles to the tube axis, and a vertical axis extending and at right angles to the tube axis and the horizontal axis. The effective surface of the shadow mask is formed so that, in the region located on the horizontal axis, the radius of curvature in the direction of the horizontal axis of the surface is larger than the radius of curvature in the direction of the vertical axis of the surface in a region substantially halfway between the center of the surface and a horizontal end of the surface, and so that, in the region located on the horizontal axis, the horizontal radius of curvature is smaller than the vertical radius of curvature in a region near the horizontal end portion.

REFERENCES:
patent: 4636683 (1987-01-01), Tokita et al.
patent: 4677339 (1987-06-01), Inoue et al.
patent: 4697119 (1987-09-01), Inoue et al.
patent: 4839556 (1989-06-01), Ragland, Jr.
patent: 4881004 (1989-11-01), Inoue et al.
patent: 4943754 (1990-07-01), Hirai et al.
patent: 5155410 (1992-10-01), Wakasono et al.

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