Electric lamp and discharge devices – With luminescent solid or liquid material – Vacuum-type tube
Patent
1996-12-18
1998-05-12
Patel, Ashok
Electric lamp and discharge devices
With luminescent solid or liquid material
Vacuum-type tube
313497, 313466, H01J 1900
Patent
active
057511063
ABSTRACT:
A fluorescent display tube has high visibility because reflection of Al of an anode conductor is prevented. A black film 3 formed on the inner surface of a substrate 2 is formed such that an inorganic metal containing compound is changed into a metal oxide by heat treatment, and consists of a TaO.sub.2 --, Tl.sub.2 O--, SnO--, or (Mn, Cu)--based oxide. An SiO.sub.2 film 4 serving as an alkali-shielding film is formed on the inner surface of the substrate 2 to cover the black film 3. An anode conductor 5 consisting of Al is formed on the SiO.sub.2 film 4. The anode conductor 5 is constituted of a frame member 6 and a stripe-shaped display unit 7 with transparency. The frame member 6 is behind the black film. The display unit 7 is partitioned by the inner edge of the gap between the black films 3. A phosphor layer 8 is formed on the display unit 7. A cross layer 9 is formed to cover the SiO.sub.2 film 4. Light emitted from the phosphor layer 8 is partitioned with respect to the appearance of the light and observed through the substrate 2. Due to the black film, the reflectance of the Al film is low, i.e., 10% or less at 530 nm. Good contrast can be obtained, and a display unit can be read easily.
REFERENCES:
patent: 4218636 (1980-08-01), Miyazawa
patent: 4472658 (1984-09-01), Morimoto et al.
patent: 4551652 (1985-11-01), Compen et al.
patent: 4666548 (1987-05-01), Eto et al.
patent: 4717856 (1988-01-01), Kato
Mihira Akihiro
Mizohata Tadashi
Futaba Denshi Kogyo K.K.
Patel Ashok
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