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

F - Mech Eng,Light,Heat,Weapons

21

V

240/155

F21V 7/00 (2006.01) F21S 8/00 (2006.01)

Patent

CA 1154415

ABSTRACT OF THE DISCLOSURE 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 pre- determined 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 eccen- tricity greater than the second ellipsoidal section spaced a greater distance away from the lamp filament.

374718

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