Light guide illumination device appearing uniform in...

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

Patent

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Details

F21V 8/00 (2006.01)

Patent

CA 2395385

An illumination device (230) that is relatively bright and uniform in appearance includes a light guide (230), which has a light guide core (260) having an optically smooth surface for propagating light therethrough. A light emitting region, which extends along a portion of the core (260), includes at least one light extraction structure (2181, 2182, 2183) located along the optically smooth surface of the light guide core (260). The light extraction structure (2181, 2182, 2183), which includes an optically reflective surface (250) extending into the light guide core (260), is oriented to reflect light at an angle less than a critical angle necessary for light to propagate through the light guide core (260). A diffuse reflective material (250) is disposed around at least a portion of the light guide (230). The diffuse reflective material (250) directs at least a portion of the light reflected by the light extraction structure (2181, 2182, 2183) back through the light guide so that light is emitted through the light emitting region of the optically smooth surface.

L'invention concerne un dispositif d'éclairage (230) paraissant relativement clair et uniforme et comprenant un guide (230) de lumière doté d'un noyau (260) guide de lumière dont la surface optiquement régulière est destinée à propager la lumière. Une région photoémettrice, qui s'étend le long d'une partie du noyau (260), comprend au moins une structure d'extraction lumineuse (218¿1?, 218¿2?, 218¿3?) située le long de la surface optiquement régulière du noyau (260) guide de lumière. Ladite structure d'extraction lumineuse (218¿1?, 218¿2?, 218¿3?), qui comprend une surface de réflexion optique (250) pénétrant dans le noyau (260) guide de lumière, est orientée de manière à réfléchir la lumière à un angle inférieur à l'angle critique nécessaire pour que la lumière se propage à travers le noyau (260) guide de lumière. Un matériau réfléchissant par diffusion (250) est disposé au moins autour d'une partie du guide (230) de lumière. Ledit matériau réfléchissant par diffusion (250) renvoie au moins une partie de la lumière réfléchie par la structure d'extraction lumineuse (218¿1?, 218¿2?, 218¿3?) à travers le guide de lumière, de telle sorte que la lumière est émise à travers la région photoémettrice de la surface optiquement régulière.

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