G - Physics – 03 – B
Patent
G - Physics
03
B
G03B 21/60 (2006.01)
Patent
CA 2194410
Concave-shaped projection screen of great light gain, the light reflexion capacity of which is much greater than the screens currently used because, instead of the silver surface usually used as well as the screen's structural support (1), two pellicles with very different action are used. One (2) is slightly translucent and produces, almost without light absorption, the scattering of the light that passes through it, due to the micrometrical irregularity of its surface. The second one (3), which is completely mirrored, recedes the light in the opposite direction and, by crossing the first pellicle, scatters the light a bit more. Since the pellicles are thin, they can be adhesive, and the first one can also have other characteristics such as a fluted surface, in order to make the light diverge more on a horizontal level than a vertical level, since there is no use in wasting light on the ceiling or the floor.
Cette invention concerne un écran de projection de forme concave offrant un gain de lumière important et dont la capacité de réflexion de la lumière est bien supérieure à celle des écrans traditionnels, étant donné que l'on fait appel à deux pellicules produisant des effets très différents au lieu de la surface argentée habituellement utilisée et du support structurel (1) de l'écran. La première pellicule (2) est légèrement translucide et, presque sans absorber la lumière, diffuse la lumière qui la traverse grâce aux irrégularités micrométriques de sa surface. La seconde pellicule (3), qui est complètement réfléchissante, renvoie la lumière dans la direction opposée et, lors du passage de la lumière à travers la première pellicule, permet de diffuser encore un peu plus celle-ci. Grâce à leur finesse, ces pellicules peuvent être adhésives, et la première peut également posséder d'autres caractéristiques tel qu'un surface striée afin d'accroître la dispersion de la lumière plus sur le plan horizontal que vertical, vu qu'il n'existe aucun besoin de gaspiller de la lumière vers le sol ou le plafond.
Abrantes Candeias Joaquim Antonio
Robic
LandOfFree
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