Electric lamp and discharge devices – Cathode ray tube – Screen
Patent
1991-02-04
1992-04-21
Yusko, Donald J.
Electric lamp and discharge devices
Cathode ray tube
Screen
313478, 358237, 359359, 359580, H01J 2910, H01J 3112
Patent
active
051071738
ABSTRACT:
A high-quality projection cathode ray tube is for projecting the image displayed on a fluorescent surface, as an enlarged image on a screen in front of the fluorescent surface through a projection lens projection lens disposed at a given distance ahead. On the inner surface of a face panel, a multilayer optical interference film including optical thin film layers of alternately superimposed high refractive and low refracte index materials is provided. The outermost surface of the multilayer optical interference film is coated with a film of an inorganic material such as silicon dioxide which is optically transparent and stable with respect to the impact of an electron beam. The thickness of the transparent film is not less than 1.0 .mu.m. Even an electron beam having a high energy which has passed through the gaps of the phosphor layer loses the energy in this protective film. Thus, the projection cathode ray tube is capable of reducing the deterioration of the light output with time, by suppressing the browning phenomenon of the glass surface of the face panel and the multilayer optical interference film.
REFERENCES:
patent: 4609267 (1986-09-01), Deguchi et al.
patent: 4634926 (1987-01-01), Vriens et al.
patent: 4642695 (1987-02-01), Iwasaki
patent: 4683398 (1987-07-01), Vriens et al.
patent: 4804884 (1989-02-01), Vriens et al.
Hamadi Diab
Mitsubishi Denki & Kabushiki Kaisha
Yusko Donald J.
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