LED with compound encapsulant lens
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United States of America Patent
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Sep 21, 2010
Issued Date -
N/A
app pub date -
Dec 30, 2005
filing date -
Dec 30, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
An LED light source includes an LED emitter and an encapsulant that at least partially surrounds the emitter. The encapsulant includes an inner lens and an outer lens, the inner lens having a refractive index less than, and in some cases about 70 to 80% of, the refractive index of the outer lens. The inner lens and outer lens can contact each other along a curved surface, and in some cases the inner lens is substantially plano-convex and the outer lens is meniscus. The inner lens produces a first virtual image of the emitter and the outer lens produces a second virtual image, and the first virtual image is disposed between the emitter and the second virtual image. The LED light source is capable of providing uniform illumination in a compact space.
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