Alumina coatings for mercury vapor lamps

Details Alumina coatings for mercury vapor lamps Alumina coatings for mercury vapor lamps

1977-05-02

1978-03-14

Demeo, Palmer C.

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

313493, 313113, 313221, H01J 6135, H01J 6140

Patent

active

040792889

ABSTRACT:
An improved mercury vapor lamp construction as described which includes an ultraviolet reflecting underlayer of alumina particles for the phosphor coating to enable reduction in the phosphor coating weight without accompanying reduction in the lamp lumen output. The alumina underlayer comprises spherical alumina particles that have been vapor-deposited in a certain particle size range to provide selective reflection of the ultraviolet radiation being emitted from the overlying phosphor coating. The alumina underlayer is deposited upon the interior surface of the lamp glass envelope and has been found generally useful in otherwise conventional high-pressure and low-pressure mercury vapor lamps.

REFERENCES:
patent: 2864966 (1958-12-01), Burns
patent: 2892956 (1959-06-01), Vodicka
patent: 3067356 (1962-12-01), Ray
patent: 3541377 (1970-11-01), Nagy
patent: 3617357 (1971-11-01), Nagy
patent: 3748518 (1973-07-01), Lewis
patent: 3842306 (1974-10-01), Henderson et al.
patent: 3845343 (1974-10-01), Hammer

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