Electric lamp and discharge devices – Cathode ray tube – Shadow mask – support or shield
Patent
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.
Fox John C.
Horabik Michael
U.S. Philips Corporation
Yusko Donald J.
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