LED device having collimator lens
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United States of America Patent
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Oct 24, 2017
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N/A
app pub date -
Nov 7, 2014
filing date -
Mar 26, 2014
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Abstract
An LED device includes a plurality of LED dies, a plurality of lens, a diffuser plate and a collimator lens. The collimator lens is positioned between the diffuser plate and the lens. The collimator lens includes a plurality of fresnel lenses. A focus of each fresnel lens is equal to a distance between a plane where the fresnel lens places and a light outputting surface of the LED die. Light emitted from the LED dies is adjusted to collimator light and striking perpendicularly into the diffuser plate.
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