Embodiments of the present invention provide separate optical devices operable to couple to a separate LED, the separate optical device comprising an entrance surface to receive light from a separate LED when the separate optical device is coupled to the separate LED, an exit surface opposite from and...http://www.google.fr/patents/US7968896?utm_source=gb-gplus-shareBrevet US7968896 - Separate optical device for directing light from an LED
Separate optical device for directing light from an LED
