An improved led device for wide beam generation and method...

F - Mech Eng,Light,Heat,Weapons – 21 – V

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F21V 5/04 (2006.01)

Patent

CA 2684214

A predetermined illuminated surface pattern is generated from a predetermined energy distribution pattern of an LED light source within an LED package having a light transmitting dome. An estimated optical transfer function of a lens shape of an optic is defined by the shape of an exterior and inner surface which envelopes at least in part the light transmitting dome of the LED package An energy distribution pattern is obtained by combination of the estimated optical transfer function and the predetermined energy distribution pattern of the light source. A projection of the energy distribution pattern onto the illuminated surface is determined. The projection is compared to the predetermined illuminated surface pattern. The estimated optical transfer function is then modified and the steps repeated until acceptable consistency is achieved between the projection and the predetermined illuminated surface pattern.

L'invention concerne un motif de surface éclairée prédéterminé généré à partir d'un motif de distribution d'énergie prédéterminé d'une source lumineuse DEL dans un emballage DEL ayant un dôme transmettant la lumière. Une fonction de transfert optique estimée d'une forme de lentille d'une optique est définie par la forme d'une surface extérieure et d'une surface interne qui enveloppe au moins en partie le dôme transmettant la lumière de l'emballage DEL. Un motif de distribution d'énergie est obtenu par combinaison de la fonction de transfert optique estimée et du motif de distribution d'énergie prédéterminé de la source lumineuse. Une projection du motif de distribution d'énergie sur la surface éclairée est déterminée. La projection est comparée au motif de surface éclairée prédéterminé. La fonction de transfert optique estimée est ensuite modifiée et les étapes sont répétées jusqu'à obtenir une cohérence acceptable entre la projection et le motif de surface éclairée prédéterminé.

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