Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1986-05-29
1992-05-19
Groody, James J.
Facsimile and static presentation processing
Static presentation processing
Attribute control
313468, 2523014F, H04N 931, H01J 2910, C09K 1108
Patent
active
051153068
ABSTRACT:
A projection cathode-ray tube for a projection video apparatus, comprising a green-emitting screen including a terbium-activated lanthanum oxychloride phosphor. The disclosed phosphor exhibits a luminance maximum at a minimum beam size, a property advantageous for producing a high-resolution image. The phosphor is chemically stable at high temperatures. The phosphor shows no substantial decrease in emission efficiency even at about 80.degree. C., and the emission luminance is twofold that of the prior art. The green-emitting screen is made by the steps of: (a) settling the terbium-activated lanthanum oxychloride phosphor onto the inner surface of a cathode-ray tube, wherein the phosphor is settled from a suspension comprising a solution of potassium water glass and barium nitrate, and wherein the ratio of the weight concentration of potassium water glass to barium nitrate is in the range between about 20 to about 35; and (b) removing the resulting supernatant.
REFERENCES:
patent: 2650884 (1953-09-01), Pakswer et al.
patent: 2793137 (1957-05-01), Friedman
patent: 3591516 (1971-07-01), Rabatin
patent: 3617743 (1971-11-01), Rabatin et al.
patent: 3996472 (1976-12-01), Rabatin
patent: 4099089 (1978-07-01), Rabatin
patent: 4208470 (1980-06-01), Rabatin
patent: 4436646 (1984-03-01), Takahara et al.
patent: 4518985 (1985-05-01), Tamatani et al.
patent: 4547699 (1985-10-01), Fitzpatrick
patent: 4559469 (1985-12-01), Welker et al.
patent: 4604550 (1986-08-01), van Koesveld et al.
F. A. Kroger, "Some A . . . Luminescence of . . . ", 1948, pp. 118-119, 182-187, 192-193.
Sakamoto, H., "Luminescent Materials and Their Application for Cathode-Ray Tubes", Electronic Ceramics, Jan. 1980, pp. 65, 68.
Chemical Abstracts, vol. 65 (1966), Abstract No. 17884(g).
Tsuda, Nobuyuki et al., "Green Emitting Phosphor for Projection CRTs", in Synopsis of the Lecture of the Phosphor Research Society in Japan, No. 199 (Feb. 3, 1984).
C. G. A. Hill, "Cathode Ray Tube Phosphors", Society For Information Display, vol. II, Jun. 1984, pp. 6, 2-9.
A. Brill, et al., "Intrinsic Efficiencies of Phosphors Under Cathode Ray Excitation", Philips Research Reports, vol. 7, No. 6, Dec. 1952, pp. 401, 408-411.
Ajiro Fukaya
Hitosi Nagai
Tamatani Masaaki
Tsuda Nobuyuki
Groody James J.
Tokyo Shibaura Denki Kabushiki Kaisha
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