Color picture tube with curved shadow mask

Details Color picture tube with curved shadow mask Color picture tube with curved shadow mask

2007-09-04

2007-09-04

Patel, Nimeshkumar D. (Department: 2879)

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

C313S408000

Reexamination Certificate

active

11141380

ABSTRACT:
The radius of curvature of an outer surface of a panel useful portion is 10,000 mm or more. Assuming that a length of a perforated region of a shadow mask in an X-axis (major axis) direction is 2L, s is a variable satisfying 0<s<1, a sagging amount difference of the perforated region at a point of X=sL with respect to a point of X=0 on the X axis and a sagging amount difference of the perforated region at a point of X=L with respect to the point of X=sL on the X axis are ΔZ01(s) and ΔZ02(s), respectively, a sagging amount difference of the perforated region at the point of X=sL with respect to the point of X=0 on the long side and a sagging amount difference of the perforated region at the point of X=L with respect to the point of X=sL on the long side are ΔZ11(s) and ΔZ12(s), respectively, when α(s) represented by α(s)=(ΔZ01(s)/ΔZ11(s))/(ΔZ02(s)/ΔZ12(s)) is defined, dα(s)/ds≧0.4 is satisfied in at least a portion in a range of 0.2≦s≦0.8. Because of this, a color picture tube can be provided, which has satisfactory visibility, and less degradation in color purity caused by doming while having a shadow mask with excellent formability and strength.

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