Uniform intensity profile catadioptric lens
First Claim
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1. A light fixture comprising:
- a housing defining an optical cavity having an optical window for allowing light to escape from said cavity;
a light source in said optical cavity; and
a reflector for directing light from said optical cavity through said optical window, said reflector having a main body of a transparent material, said main body having a smooth surface with a reflective layer adjacent thereto and a structured surface, said structured surface having a plurality of triangular prisms formed thereon, each said prisms having a transmissive facet and a reflective facet positioned such that light from said light source will enter said main body through one of said transmissive facets, be totally internally reflected by one of said reflective facets and exit through one of said transmissive facets, where each of said transmissive facets makes a first angle with said smooth surface and each of said reflective facets makes a second angle with a normal to said smooth surface, said first and second angles for each of said prisms being selected to provide preselected light intensity distribution over said optical window.
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Abstract
The present invention is a light fixture having a reflector designed to discard preselected amounts of light from a light source. The percentage of the light discarded will vary over the surface of the reflector in order to provide a predetermined output intensity distribution.
29 Citations
15 Claims
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1. A light fixture comprising:
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a housing defining an optical cavity having an optical window for allowing light to escape from said cavity; a light source in said optical cavity; and a reflector for directing light from said optical cavity through said optical window, said reflector having a main body of a transparent material, said main body having a smooth surface with a reflective layer adjacent thereto and a structured surface, said structured surface having a plurality of triangular prisms formed thereon, each said prisms having a transmissive facet and a reflective facet positioned such that light from said light source will enter said main body through one of said transmissive facets, be totally internally reflected by one of said reflective facets and exit through one of said transmissive facets, where each of said transmissive facets makes a first angle with said smooth surface and each of said reflective facets makes a second angle with a normal to said smooth surface, said first and second angles for each of said prisms being selected to provide preselected light intensity distribution over said optical window. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification