Projection cathode ray tube

Details Projection cathode ray tube Projection cathode ray tube

1990-10-12

1992-02-18

Yusko, Donald J.

Electric lamp and discharge devices

Cathode ray tube

Screen

313466, 313468, 358253, 359580, 359589, 359359, H01J 2910, G02B 522

Patent

active

050897438

ABSTRACT:
A cathode ray tube for producing images in red, green or blue is used for a projection type television set. A multi-layered interference filter is disposed between a face glass and a fluroescent layer so as to gather light beams from the fluorescent layer. The innermost layer of the interference layer is made of a high refractive index material such as tantalum pentaoxide which is resistant to hydrofluoric acid, so that a fluorescent material can be applied as efficiently as possible. The innermost layer of the interference filter has the optical distance expressed by the equation:

REFERENCES:
patent: 4634926 (1987-01-01), Vriens et al.
patent: 4642695 (1987-02-01), Iwasaki
patent: 4683398 (1987-07-01), Vriens et al.
patent: 4937661 (1990-06-01), van der Voort
patent: 4990824 (1991-02-01), Vriens et al.

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