Electric lamp and discharge devices – With temperature modifier – Double wall – jacket or casing for envelope
Patent
1977-03-28
1977-12-27
Demeo, Palmer C.
Electric lamp and discharge devices
With temperature modifier
Double wall, jacket or casing for envelope
313487, H01J 6120, H01J 6134, H01J 6148
Patent
active
040656888
ABSTRACT:
The light output of a high-presure discharge lamp that employs a mercury arc tube is selectively modified by two luminescent coatings on the inner surface of the outer protective envelope to provide color rendering and a source-color that are similar to those of an incandescent-type lamp. The coating in contact with the envelope surface comprises a blend of two selected phosphors -- one which absorbs and is excited by blue-violet radiations produced by the arc discharge and emits in the green portion of the spectrum, and another which also absorbs and is excited by the blue-violet radiations and by yellow radiations produced by the discharge and emits in the red portion of the spectrum. The second luminescent coating facing the arc tube comprises a phosphor that absorbs ultraviolet radiations produced by the mercury discharge and converts them into red radiations. The ultraviolet-converting phosphor coating is such that it transmits blue-violet and yellow radiations generated by the arc tube so that they can be absorbed and converted by the first phosphor coating. The desired color-rendering characteristics and reduction in the color temperature of the light emission are achieved with a minimum drop in light output and efficacy by using a mixture of green-emitting CaS:Ce phosphor and red-emitting CaS:Eu phosphor as the first-applied coating, and europium-activated yttrium vanadate phosphate phosphor as the second coating. Various other combinations of phosphors for the two luminescent coatings are also disclosed.
REFERENCES:
patent: 3825792 (1974-07-01), Rokosz et al.
patent: 3866083 (1975-02-01), Datta et al.
patent: 4029983 (1977-06-01), Thornton
Buleza D. S.
DeMeo Palmer C.
Westinghouse Electric Corporation
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