Plano-fresnel LED lens and LED assembly thereof
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United States of America Patent
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Oct 25, 2011
Grant Date -
Mar 11, 2010
app pub date -
May 20, 2009
filing date -
Sep 10, 2008
priority date (Note) -
Expired
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Abstract
A plano-Fresnel LED lens and a LED assembly thereof are revealed. The lens is a Fresnel lens whose optical surface on the forward side thereof is a plano surface having saw teeth with vertical taper (draft with vertical shape) so that the lens in the LED assembly concentrates light emitted from a LED chip to generate light whose peak intensity is an elliptic distribution pattern. Moreover, the lens and the LED assembly thereof satisfy certain conditions. Thereby, light from the LED chip is gathered by a single lens to form a preset specific distribution pattern and is satisfying requirement of the ratio of the luminous flux that is larger than 85%. The plano-Fresnel LED lens and a LED assembly thereof are applied to lights and flashlights in mobile phones or cameras.
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