Incandescent lamp having a halogen-containing atmosphere and an

Details Incandescent lamp having a halogen-containing atmosphere and an Incandescent lamp having a halogen-containing atmosphere and an

1973-10-18

1976-09-28

Kominski, John

Electric lamp and discharge devices

With optical device or special ray transmissive envelope

Reflector

313222, H01K 132

Patent

active

039835138

ABSTRACT:
An electric lamp having a sealed-beam or single-ended domed type envelope that contains a tungsten filament and a halogen additive is provided with a specular coating of gold, palladium, platinum, or rhodium on a selected portion of its inner surface. The metal coating serves as a non-reactive interior reflector which does not getter the halogen additive or contaminate the lamp atmosphere and thus optically controls the light output of the lamp without interfering with the halogen-tungsten regenerative cycle. In an alternative embodiment, the outer surface of the envelope is properly contoured (to provide a parabolic surface, for example) and then coated with a thin layer of aluminum, silver, nickel or chromium which serves as an exterior reflector. The regenerative tungsten-halogen cycle is thus achieved in a reflector type lamp without the separate halogen lamp component heretofore required in such lamps.

REFERENCES:
patent: 2785327 (1957-03-01), Anderson
patent: 2870362 (1959-01-01), Arnold et al.
patent: 3022436 (1962-02-01), Cooper, Jr.
patent: 3022437 (1962-02-01), Cooper, Jr.
patent: 3022438 (1962-02-01), Cooper, Jr.
patent: 3022439 (1962-02-01), Cooper, Jr.
patent: 3277330 (1966-10-01), Cooper, Jr.
patent: 3445662 (1969-05-01), Langley
patent: 3536946 (1970-10-01), Kopelman et al.

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