Combined optical diffuser and light concentrator
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United States of America Patent
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Jan 19, 1999
Grant Date -
N/A
app pub date -
Mar 8, 1996
filing date -
Mar 8, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A combined optical diffuser and light concentrator uses a layer of optically transmissive material having a first surface to receive light at a range of angles of incidence and a second surface from which the light emerges at a range of angles of emergence, the second surface including a relief pattern featuring a multiplicity of minute projections, the shape and distribution of the projections resulting in diffused light at a range of angles of emergence narrower than the range of angles of incidence. The projections may be produced in accordance with various techniques, including the processing of a photoresist layer exposed to a random speckle pattern or microlithography, including e-beam/x-ray sources.
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