Cathode-ray tube having faceplate panel with essentially planar

Details Cathode-ray tube having faceplate panel with essentially planar Cathode-ray tube having faceplate panel with essentially planar

1989-04-25

1989-12-12

Schor, Kenneth M.

Electric lamp and discharge devices

Cathode ray tube

Screen

313477R, H01J 2910, H01J 2986

Patent

active

048870013

ABSTRACT:
The present invention provides an improvement in the appearance of a cathode-ray tube including a rectangular faceplate with an exterior surface having curvature along both the minor and major axes. The faceplate also includes a cathodoluminescent screen on an interior surface thereof. At least in the center portion of the faceplate, the curvature along the minor axis is at least 10 percent greater than the curvature along the major axis. Points on the exterior surface near the ends of the major axis, at the edges of the screen, lie in a first plane which is perpendicular to the central longitudinal axis of the tube; points on the exterior surface near the ends of the minor axis, at the edges of the screen, lie in a second plane which is spaced from and parallel to the first plane; and points on the exterior surface near the ends of the diagonals of the rectangular faceplate, at the edges of the screen, lie in a third plane which is spaced from and parallel to the first plane. The three planes are spaced from the center portion of the faceplate in the order of second plane, first plane and third plane.

REFERENCES:
patent: Re27259 (1971-12-01), Rublack
patent: 1705661 (1930-03-01), Bown
patent: 2728012 (1955-12-01), Swedlund
patent: 3931906 (1976-01-01), Bradu
patent: 4136300 (1979-01-01), Morrell
patent: 4535907 (1985-08-01), Tokita et al.
patent: 4537321 (1985-08-01), Tokita
patent: 4537322 (1985-08-01), Okada et al.

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