Color picture tube

Details Color picture tube Color picture tube

2006-05-16

2006-05-16

Patel, Ashok (Department: 2879)

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

C313S461000, C313S47700R

Reexamination Certificate

active

07045942

ABSTRACT:
The radius of curvature of the outer surface of a panel is 10,000 mm or more, and a shadow mask is made of a material containing 95% or more of iron. A sagging amount change curve along a curve C1on the surface of the shadow mask, which a plane passing through a center P0of a useful area of the shadow mask and parallel to a tube axis and a major axis crosses, satisfies a particular Condition 1. Assuming that an intersection between the curve C1and a useful area end of the shadow mask is a major axis end PL, a distance from the center P0to the major axis end PL along a major axis is W, and a point on the curve C1away from the center P0by ⅔×W in the major axis direction is P1,a sagging amount change curve along a curve C2on the surface of the shadow mask, which a plane passing through the point P1and parallel to the tube axis and the minor axis crosses, satisfies a particular Condition 2. Consequently, a color picture tube can be realized, which has satisfactory visibility, and less degradation in color purity caused by doming while having a shadow mask made of an inexpensive material with satisfactory moldability.

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