Varible-thickness shadow mask for color cathode-ray tubes

Details Varible-thickness shadow mask for color cathode-ray tubes Varible-thickness shadow mask for color cathode-ray tubes

1994-03-01

1995-01-24

Yusko, Donald J.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313403, H01J 2907

Patent

active

053845110

ABSTRACT:
An apertured shadow mask is curved so that the curvature is concave on the back surface. The front surface generally follows the curvature of the back surface but has an undulating profile with ribs separated by troughs. The local thickness of the shadow mask is greatest in the ribs, and becomes gradually thinner toward the center lines of the troughs. The ribs and the center lines of the troughs have a zig-zag configuration. As a result, the front surface and neutral plane of the shadow mask have both convex and concave areas, which reduces localized doming.

REFERENCES:
patent: 3872345 (1975-03-01), Yamazaki et al.
patent: 4072876 (1978-02-01), Morrell
patent: 4122368 (1978-10-01), Masterton
patent: 4146816 (1979-03-01), Morrell
patent: 4173729 (1979-11-01), Stone et al.
patent: 4187443 (1980-02-01), D'Amato et al.
patent: 4195248 (1980-03-01), D'Amato et al.
patent: 4727280 (1988-02-01), Fujimura
"A Theoretical Study of Doming Phenomena in Shadow-Mask Tubes", The Journal of the Institute of Television Engineering, vol. 31, No. 6, p. 47, Jun. 1977.

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