LED-based elevated omnidirectional airfield light

Details LED-based elevated omnidirectional airfield light LED-based elevated omnidirectional airfield light

2005-08-23

2005-08-23

O'Shea, Sandra (Department: 2875)

Illumination

Light source and modifier

Including reflector

C362S327000, C362S800000, C362S183000

Reexamination Certificate

active

06932496

ABSTRACT:
A light emitting apparatus includes a light source, a light transformer, a hemispherical optical window, a circuit and a base. The light transformer includes a truncated hollow conical reflector, a curved reflective surface, and an optical element. The conical reflector has a truncated end facing the light source and a cone base opposite the truncated end. The conical reflector axis is coincident with a light source axis, and light passes through an opening on the truncated end. The curved reflective surface is between the truncated end and the cone base. The surface reflects light from the light source in a limited angle omnidirectional pattern with precalculated intensity distribution. The optical element is adjacent the cone base in a plane perpendicular to the conical reflector axis, and disperses the light passing through the truncated hollow cone reflector.

REFERENCES:
patent: 1384659 (1921-07-01), Benard
patent: 5335157 (1994-08-01), Lyons
patent: 6312143 (2001-11-01), Drazic et al.

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