H - Electricity – 01 – J
Patent
H - Electricity
01
J
313/35.34
H01J 31/10 (2006.01) H01J 29/18 (2006.01) H01J 29/28 (2006.01) H01J 29/89 (2006.01)
Patent
CA 2035365
ABSTRACT OF THE DISCLOSURE A high-quality projection cathode ray tube for project- ing the image displayed on a fluorescent surface as an enlarged image on a screen in front of the fluorescent surface through a projection lens disposed at a given distance ahead. On the inner surface of a face panel, a multilayer optical interference film consisting of 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 µm. 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.
Gowling Lafleur Henderson Llp
Mitsubishi Denki Kabushiki Kaisha
LandOfFree
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