Airfield light having a light source arranged in a house
AssigneeMeta-Fer AG
InventorJan E. Vadseth
Life of this patent
Estimating the term…
Abstract
The invention relates to an airfield light, principally for marking aircraft parking lots, routes for ground staff, etc. It should be readily visible from all sides and from any angle, even in the poorest environmental conditions and from a relatively long distance. It consists of a light source which is arranged in a housing and radiates light in a hemisphere through at least one lens installed in the housing, the light beam (1) in the zenith of the hemisphere having a luminous intensity which is at least 20 percent higher than in the region (13) between 10 and 30 degrees above the lowermost radiant edge (2).
Claims14
An airfield light comprising:
- a housing;
- at least one lens mounted to said housing;
- a single source of light mounted within said housing, said source of light emitting light in a hemisphere;
- the light emitted by said source of light passing through said at least one lens, said at least one lens distributing the emitted light as a light beam having a luminous intensity in the zenith of the hemisphere of emitted light which is at least 20% higher than the luminous intensity thereof in the region between 10 and 30 degrees above the lowermost radiant edge of the light beam or above the ground and wherein the luminous intensity of the light beam from the region between 30 degrees above the lowermost radiant edge of the light beam or above the ground and the zenith is about one-half of the luminous intensity in said region between 10 and 30 degrees.
An air field light having a light source which is arranged in a housing and radiates light in a hemisphere through at least one lens inserted in the housing, wherein the light beam in the zenith of the hemisphere has a luminous intensity which is at least 20% higher than in the region between 10 and 30 degrees above the lowermost radiant edge of the airfield light or above the ground, the lens being in the form of a Fresnel lens having zones in facing relation to the light source and a flat surface on a side thereof opposite the zones, the flat surface being disposed in the plane of the surrounding ground.
Dependencies are inferred from the claim text.