LED ARRAY WITHIN ASYMMETRIC CAVITY HAVING REFLECTIVE AND NON-REFLECTIVE REGIONS
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United States of America Patent
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Issued Date -
Mar 2, 2017
app pub date -
Aug 31, 2015
filing date -
Aug 31, 2015
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Abstract
A packaged light emitting device 100 that allows enhanced light cutoff in lighting applications to better control glare and optimize lumen output. Packaged device 100 includes an LED array 4 in cavity 32 whose inner wall includes both a reflective wall portion 34 and a non-reflective wall portion 36 to increase output of useful light while mitigating reflection of light that can cause glare. An array 4, preferably linear, of light-emitting diodes 3 is formed on printed circuit board (PCB) 1, and surrounded by wall 30 which bounds cavity 32. A first circuit board portion 20 of PCB upper surface 2 enclosed within wall 30 disposed forward of LED array 4 and adjoining non-reflective wall portion 36 is non-reflective, such as being black. A second circuit board portion 22 is reflective, such as being silvered. Packaged device 100 is suited for automotive headlights and fog lights.
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