Cathode ray tube having multilayer interference filter

Details Cathode ray tube having multilayer interference filter Cathode ray tube having multilayer interference filter

1990-05-15

1991-11-26

O'Shea, Sandra L.

Electric lamp and discharge devices

Cathode ray tube

Screen

313112, H01J 2910

Patent

active

050685686

ABSTRACT:
A cathode ray tube, such as a projection cathode ray tube, having a multilayer interference filter disposed between the cathodoluminescent screen and the interior side of the faceplate, the interference filter comprising alternate layers having high (H) and low (L) refractive indices, the high refractive index material being niobium pentoxide and the low refractive index material being either silicon oxide or magnesium fluoride. These filters are substantially free from the crazing which occurs in known filters when subjected to the normal thermal processing of cathode ray tubes.

REFERENCES:
patent: 4065696 (1977-12-01), Steierman
patent: 4310783 (1982-01-01), Temple et al.
patent: 4634926 (1987-01-01), Vriens et al.
patent: 4683398 (1987-07-01), Vriens et al.
Chem. Abstracts; Pawlewicz et al, "Reactively Sputtered Optical Coatings for Use at 1064 nm", 93:158673b.

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