Cathode-ray tube having a faceplate panel with a smooth aspheric

Details Cathode-ray tube having a faceplate panel with a smooth aspheric Cathode-ray tube having a faceplate panel with a smooth aspheric

1983-09-06

1986-02-11

Smith, William F.

Electric lamp and discharge devices

Cathode ray tube

Screen

313477R, H01J 2986

Patent

active

045701016

ABSTRACT:
The present invention provides an improvement in a cathode-ray tube including a rectangular faceplate which has 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 greater than the curvature along the major axis. In the improvement, points on the exterior surface near the ends of the minor and major axes, at the edges of the screen, lie in a 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 second plane. The second plane is parallel to the first plane and is farther from the center portion of the faceplate than is the first plane.

REFERENCES:
patent: Re27259 (1971-12-01), Rublack
patent: 2728012 (1955-12-01), Swedlund
patent: 3931906 (1976-01-01), Brado
patent: 4136300 (1979-01-01), Morrell

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