F - Mech Eng,Light,Heat,Weapons – 21 – V
Patent
F - Mech Eng,Light,Heat,Weapons
21
V
F21V 8/00 (2006.01)
Patent
CA 2408482
An edge lit illumination device is described. The device has at least one light source (13, 14) and a light transmission element (10) having at least one light output surface (12) and at least one light ingress edge substantially perpendicular to said surface (12). The light source (13, 14) is located adjacent to the light ingress edge so that light from the light source (13, 14) enters the transmission element (10) via the said edge and propagates through the element (12). The light output surface (12) is uniformly roughened across the output surface. The roughening is sufficiently fine to give an average Ra value across the surface of less than 1.0 µm/mm thickness of the element or drop-off of light output across the surface of less than 5000 lux.
L'invention concerne un dispositif d'éclairage par la tranche comportant au moins une source lumineuse (13, 14) et un élément de transmission lumineuse (10) doté d'au moins une surface de sortie lumineuse (12) et d'au moins une tranche d'entrée lumineuse sensiblement perpendiculaire à ladite surface (12). La source lumineuse (13, 14) est adjacente à la tranche d'entrée si bien que la lumière de la source (13, 14) entre dans l'élément de transmission (10) via la tranche et se propage à travers l'élément (12). La surface de sortie (12) est rendue rugueuse uniformément sur toute son étendue, mais la rugosité est suffisamment fine pour donner sur toute la surface une valeur moyenne de Ra inférieure à une épaisseur de 1 µm/mm de l'élément ou une chute de la sortie lumineuse de moins de 5000 lux.
Lucite International Uk Limited
Riches Mckenzie & Herbert Llp
LandOfFree
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