UV stable optical element and LED lamp using same
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United States of America Patent
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Dec 10, 2013
Grant Date -
Nov 22, 2012
app pub date -
May 16, 2011
filing date -
May 16, 2011
priority date (Note) -
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Abstract
A UV stable optical element and an LED lamp using such an element are disclosed. Embodiments of the invention include an optical element made at least in part from an inherently UV stable polyester, so that consumable UV-stabilizing additives are not needed. Thus, the substrate of the optical element can maintain transparency and other desirable characteristics over longer periods of time in the face of high ultraviolet light exposure. In some embodiments, the optical element includes the inherently UV stable polyester and a phosphor for remote wavelength conversion. In some embodiments, the UV stable polyester is an aromatic polyester such as polyarylate. The optical element according to example embodiments of the invention can be used in an LED lamp.
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