Color cathode-ray tube with nonspherical curved shadow mask

Details Color cathode-ray tube with nonspherical curved shadow mask Color cathode-ray tube with nonspherical curved shadow mask

1994-10-25

1997-05-20

O'Shea, Sandra L.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313407, 313408, H01J 2907

Patent

active

056315201

ABSTRACT:
A shadow mask of a color cathode-ray tube includes a mask body in the form of a substantially rectangular curved surface. The mask body has a center, horizontal and vertical axes perpendicularly crossing each other at the center, long sides extending in parallel to the horizontal axis, and short sides extending in parallel to the vertical axis. In a region of the mask body which is adjacent to the vertical axis, the radius of curvature in the vertical direction is smaller at portions of the mask body which are near the long sides than at the central portion of the mask body. In a intermediate region of the mask body between the vertical axis and each short side, the radius of curvature in the vertical direction is larger at the portions of the mask body which are near the long sides than at a portion adjacent to the horizontal axis.

REFERENCES:
patent: 4551651 (1985-11-01), van der Ven
patent: 4837482 (1989-06-01), Adachi et al.
patent: 5416378 (1995-05-01), Andrevski
patent: 5424603 (1995-06-01), Van Den Bekerom

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