Color cathode ray tube

Details Color cathode ray tube Color cathode ray tube

1985-09-12

1987-06-30

Myracle, Jerry W.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313408, 313303, H01J 2907

Patent

active

046773398

ABSTRACT:
In a color cathode ray tube with a shadow mask shaped as a nonspherical surface, a structure in which the curved surface shape of the effective area of the shadow mask in which apertures through which electron beams pass to a fluorescent screen are formed is made such that, going along the X axis, minimal values of radius of curvature of lines of intersection of the shadow mask and Y-Z parallel planes parallel to the minor axis Y and a central axis which passes through the mask's center and is normal to the mask exist between the center and the edges of the effective area. This prevents local doming.

REFERENCES:
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), Morell
patent: 4173729 (1979-11-01), Stone et al.

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