Color picture tube having improved slit column pattern

Details Color picture tube having improved slit column pattern Color picture tube having improved slit column pattern

1985-12-19

1987-05-12

DeMeo, Palmer C.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313408, H01J 2907

Patent

active

046653392

ABSTRACT:
The present invention provides an improvement in color picture tubes having slit type apertured shadow masks wherein the aperture throats are arranged in columns, and the apertures within each column are separated by webs. The improvement comprises the aperture throat columns passing through a center portion of the mask being substantially straight, and the aperture throat columns on both sides of the center portion of the mask being convexly curved toward the center portion and increasing in curvature with distance from the center portion.

REFERENCES:
patent: 3686525 (1972-08-01), Naruse et al.
patent: 3889145 (1975-06-01), Suzuki et al.
patent: 3925700 (1975-12-01), Saito
patent: 3947718 (1976-03-01), van Lent
patent: 4136300 (1979-01-01), Morrell
patent: 4162421 (1979-07-01), Morrell
patent: 4300069 (1981-11-01), Nolan
patent: 4303466 (1981-12-01), Thoms
patent: 4429028 (1984-01-01), Kuzminski

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