Color cathode ray tube having shadow mask with some long, narrow

Details Color cathode ray tube having shadow mask with some long, narrow Color cathode ray tube having shadow mask with some long, narrow

1988-03-25

1992-02-04

Yusko, Donald J.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313408, H01J 2981

Patent

active

050862502

ABSTRACT:
A color cathode ray tube having a shadow mask comprising columns of vertically elongate apertures separated by bridges. In order to obtain smooth north and south edges to the cathodoluminescent screen and the desired mask transmission, at least some of the apertures which terminate at the top and bottom mask edges are longer and narrower than the adjacent apertures in the same column. These longer, narrower apertures are provided in those cases where normal width apertures would have been excessively foreshortened by the mask edge, for example their lengths are less than their widths, and where columns would have terminated in a bridge or a part thereof.

REFERENCES:
patent: 3652895 (1972-03-01), Tsuneta et al.
patent: 4300070 (1981-11-01), Godfrey et al.

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