Optical system for airport semi-flush approach lights

Details Optical system for airport semi-flush approach lights Optical system for airport semi-flush approach lights

1981-04-09

1983-10-04

Nelson, Peter A.

Illumination

Light source and modifier

Including reflector

362 62, 362346, 362195, 362350, 362308, 362362, 362310, 362328, 362329, 362344, F21V 708

Patent

active

044082665

ABSTRACT:
This invention relates to a threshold and approach semi-flush light of the type which utilizes a high intensity lamp surrounded by a reflector which concentrates the light emitting from the lamp on a mirror located above the lamp. The mirror reflects the light through a prism in a predetermined pattern. The reflector comprises a pair of ellipsoidal surfaces of differing eccentricities joined together to form a composite reflector, such that the ellipsoidal section nearest the lamp filament has an eccentricity greater than the second ellipsoidal section spaced a greater distance away from the lamp filament.

REFERENCES:
patent: 2645706 (1953-07-01), Bowland
patent: 3250907 (1966-05-01), Keck et al.
patent: 3369112 (1968-02-01), Loch
patent: 3586849 (1971-06-01), Starkweather
patent: 3678260 (1972-07-01), Beal
patent: 3697736 (1972-10-01), Frederiksen
patent: 4161770 (1979-07-01), Maurer
patent: 4180850 (1979-12-01), Bivens
patent: 4218727 (1980-08-01), Shemitz et al.
patent: 4295186 (1981-10-01), Sugiura et al.

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