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US 2012/0223255 A1Published application
Precision approach path indicator
AssigneeAeronautical & General Instruments Limited
InventorDuncan John William Walker
Life of this patent
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Abstract
A Precision Approach Path Indicator (PAPI) unit comprises first and second light sources and a projection lens assembly. Light emitted by the first and second light sources is collected by first and second solid waveguides respectively and is guided by said waveguides to an intermediate plane. The intermediate plane is located in the focal plane of the projection lens assembly.
Claims24
A Precision Approach Path Indicator (PAPI) unit comprising:
- a first light source and a second light source;
- a first solid waveguide and a second solid waveguide;
- and
- a projection lens assembly, wherein light emitted by the first light source and the second light source is collected by the first solid waveguide and the second solid waveguide respectively and is guided by the first solid waveguide and the second solid waveguide to an intermediate plane, the intermediate plane being located in a focal plane of the projection lens assembly.
1 more element
Dependencies are inferred from the claim text.