Color display tube with shadow mask having elongated apertures t

Details Color display tube with shadow mask having elongated apertures t Color display tube with shadow mask having elongated apertures t

1979-02-21

1980-10-07

Demeo, Palmer C.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

H01J 2907

Patent

active

042271150

ABSTRACT:
The bridges between apertures located at the edge of the shadow mask of a color display tube are made at least 20% wider than the others. The width of the bridges increases linearly from row to row from the center to the edge of the mask whereby a continuously varying brightness distribution is obtained. The reproduction mask used in the fabrication of such a shadow mask can be made photographically by exposing photosensitive material through a pattern of bridges, rotating the pattern and repeating the exposure.

REFERENCES:
patent: 3652895 (1972-03-01), Tsuneta et al.
patent: 3844005 (1974-10-01), Yamada et al.
patent: 4127791 (1978-11-01), Van Lent

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