Illumination – Light source or light source support and luminescent material
Patent
1992-01-07
1993-05-18
Cole, Richard R.
Illumination
Light source or light source support and luminescent material
362260, 362293, F21V 722, F21V 900, F21V 916
Patent
active
052114678
ABSTRACT:
A long life fluorescent lighting system provides uniform white light illumination with high efficiency. The system includes a gas-filled lamp with no phosphors on the inside surface of the lamp. A diffuser plate or mirror external to the lamp includes a phosphor coating to convert ultraviolet radiation emitted by the lamp to uniform white light illumination. The lamp may be filled with mercury vapor enriched with .sup.196 Hg for emission of 254 nm wavelength ultraviolet radiation and minimization of radiation trapping. The system may include band pass reflectors for reflecting 254 nm radiation to the phosphors and reflecting unwanted 185 nm radiation away from the phosphors and back into the lamp. The system provides uniform, high efficiency white light output suitable for back illumination of liquid crystal displays.
REFERENCES:
patent: 1313622 (1919-08-01), Dodds
patent: 1847134 (1932-03-01), Nikonow
patent: 2213868 (1940-09-01), Lucian
patent: 2259416 (1941-10-01), Gardner
patent: 2702862 (1955-02-01), Finney
patent: 4744012 (1988-05-01), Bergkvist
patent: 4912605 (1990-03-01), Whitehead
Cole Richard R.
McFarren John C.
Rockwell International Corporation
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