Optical filter for cathode ray tube

Details Optical filter for cathode ray tube Optical filter for cathode ray tube

1992-04-15

1993-06-08

Yusko, Donald J.

Electric lamp and discharge devices

Cathode ray tube

Envelope

313479, 313112, 313313, 358253, H01J 2988

Patent

active

052182681

ABSTRACT:
A cathode ray tube has a vacuum envelope which includes a faceplate, an optical filter formed on the faceplate, the optical filter including mainly of SiO.sub.2 and containing a coloring material, and a phosphor layer formed on the inner surface of the faceplate. The optical filter includes silicon having a fluorine-containing group and a siloxane bond at least on the surface thereof, and a maximum light absorption wavelength in a range of 400 to 650 nm is in a region of 575.+-.20 nm, and where the transmissivity for the wavelength of 450 nm is T.sub.450, that for 530 nm is T.sub.530, that for 550 nm is T.sub.550, that for 630 nm is T.sub.630, and that for the maximum absorption wavelength is Tmin, the following relationship is established:

REFERENCES:
patent: 4398119 (1983-08-01), Dodds et al.
patent: 4755716 (1988-06-01), Hayafune et al.
patent: 4937493 (1990-06-01), Koike et al.
patent: 4977347 (1990-12-01), Iou et al.
patent: 4987338 (1991-01-01), Iou et al.

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