Color picture tube having reduced local doming

Details Color picture tube having reduced local doming Color picture tube having reduced local doming

1988-03-24

1989-06-06

Wieder, Kenneth

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313408, H01J 2907

Patent

active

048374822

ABSTRACT:
A color picture tube includes a rectangular shadow mask having a longer axis and a shorter axis. The shadow mask has a curved surface. A point of the curved surface of the shadow mask is represented by an orthogonal coordinate system having an X component, a Y component, and a Z component. The coordinate system has an origin coincident with a center of the curved surface. The X component is measured along the longer axis. The Y component is measured along the shorter axis. The Z component is measured in a direction perpendicular to directions of the longer and shorter axes. A sagittal height of the curved surface represented by the Z component and measured from the origin is given by a polynomial including a term of a sixth-degree power of one of the X component and the Y component.

REFERENCES:
patent: 4677339 (1987-06-01), Inoue et al.

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