Color picture tube having shadow mask with varied aperture colum

Details Color picture tube having shadow mask with varied aperture colum Color picture tube having shadow mask with varied aperture colum

1987-01-12

1987-09-01

Moore, David K.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313408, 313402, H01J 2907

Patent

active

046911383

ABSTRACT:
An improvement is made in a color picture tube having a substantially rectangular slit-aperture type shadow mask mounted therein in spaced relation to a substantially rectangular cathodoluminescent line screen. In the specific improvement, the spacing between adjacent aperture columns near the minor axis of the mask is less at the long sides of the mask than near the major axis of the mask.

REFERENCES:
patent: 3590303 (1971-06-01), Coleclough
patent: 3889145 (1975-06-01), Suzuki et al.
patent: 3925700 (1975-12-01), Saito
patent: 3947718 (1976-03-01), van Lent
patent: 4136300 (1979-01-01), Morrell
patent: 4583022 (1986-04-01), Masterton
patent: 4636683 (1987-01-01), Tokita et al.
patent: 4638212 (1987-01-01), Nakamura

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