Perforated multi-layer optical film luminaire

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

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F21V 7/00 (2006.01) F21V 5/00 (2006.01) G09F 13/14 (2006.01)

Patent

CA 2608200

The light emitting surface (32) of an image display light box (30) is formed of multi-layer optical film having a reflectance greater than 95% and preferably about 99% or greater. This more efficiently utilizes light rays emitted by the light box's internal light source (36), since the multi-layer optical film reflects the light rays many times before the rays are absorbed and lost. Consequently, the light emitting surface (32) can have a light transmissivity characteristic which is macroscopically invariant as a function of position on the light emitting surface (32). Light boxes (10) utilizing prior art reflective materials require cumbersome, time-consuming, iterative trial and error techniques which must be customized for each light box (10) in order to compensate for light absorption losses by imparting a variable transmissivity characteristic to the reflective material.

La surface photoémettrice (32) d'un caisson lumineux (30) d'un afficheur d'images est constituée d'un film optique multicouche dont la réflectance est supérieure à 95 % et de préférence à environ 99 % ou plus. Ceci permet d'utiliser de manière plus efficace les rayons lumineux émis par la source de lumière interne (36) du caisson lumineux du fait que le film optique multicouche renvoie les rayons lumineux de nombreuses fois avant que ceux-ci soient absorbés et perdus. En conséquence, la surface photoémettrice (32) peut avoir une caractéristique de transmissivité de lumière qui est invariante d'un point de vue macroscopique en fonction de la position sur la surface photoémettrice (32). Les caissons lumineux (10) utilisant des matériaux réfléchissants de la technique intérieure font appel à des techniques encombrantes, coûteuse en temps, impliquant des essais et des erreurs itératives, ces techniques pouvant être personnalisées pour chaque caisson lumineux (10) afin de compenser les pertes d'absorption de lumière en conférant au matériau réfléchissant une caractéristique de transmissivité variable.

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