Improvements in side-scattering light guides

G - Physics – 02 – B

Patent

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G02B 6/28 (2006.01) F21V 8/00 (2006.01)

Patent

CA 2501130

The invention relates to side-scattering light guides that generally comprise a core of transparent optically homogenous material seeded with diffuser particles. The light guide also comprises an optically transmitting sheath, having a lower refractive index than the core, surrounding and in contact with the sides of the core to prevent any light being transmitted along the core from escaping through the core's sides. In general, the diffuser particles impart only a small deviation to light rays incident upon them, and are distributed to scatter light being transmitted along the core so that at least some of the scattered light exits the sides of the core. A diffusing jacket is arranged to intercept scattered light exiting the sides of the core.

L'invention concerne des guides de lumière à diffusion latérale qui, en général, comprennent un coeur de matière homogène optique transparente dans lequel sont intégrées des particules de diffusion. Le guide de lumière comprend également une gaine de transmission optique dont l'indice de réfraction est inférieur à celui du coeur et qui entoure, tout en étant en contact avec eux, les côtés du coeur pour empêcher toute lumière transmise le long de ce dernier de s'échapper par ses côtés. En général, les particules de diffusion imposent seulement un petit écart aux rayons lumineux venant les frapper et elles sont réparties pour diffuser la lumière transmise le long du coeur de sorte qu'au moins une partie de la lumière diffusée sorte par les côtés dudit coeur. Une enveloppe de diffusion est placée de façon à intercepter la lumière diffusée sortant par les côtés du coeur.

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