A lenticular illumination system

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

Patent

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Details

F21V 8/00 (2006.01) F21V 5/02 (2006.01)

Patent

CA 2322326

An optical illumination system (2) comprising a waveguide (16) that accepts light and transmits the light via total internal reflection. Attached on one face of the waveguide (16) is an array of lenticular microprisms (28), with each microprism (28) having a light input surface (30) optically coupled to the waveguide (16) and a light output surface (32). The light input surface (30) is defined by a number of tapered grooves (34) which prevent light from escaping form the waveguide (16) and further redirect light within the microprism (28). Light that escapes from the waveguide (16), reflects off the tilted sidewalls (36, 38) of the tapered grooves (34) and emerges from the microprism (28) as a spatially directed light source. An array of lenticular microlenses (60) may be positioned to accept the output of the microprisms (28) so that the light exiting from the microlenses (60) is a substantially collimated light source.

L'invention concerne un système d'éclairage optique (2) comprenant un guide d'ondes (16) acceptant la lumière et transmettant cette lumière par réflexion interne totale. Un groupement de microprismes lenticulaires (28) est fixé à l'une des faces du guide d'ondes (16), chacun de ces microprismes (28) présentant une surface d'entrée de lumière (30), couplée de manière optique audit guide d'ondes (16), ainsi qu'une surface de sortie de lumière (32). La surface d'entrée de lumière (30) est définie par plusieurs renfoncements coniques (34), qui empêchent la lumière de s'échapper du guide d'ondes (16) et la réorientent vers l'intérieur desdits microprismes (28). La lumière qui s'échappe dudit guide d'ondes (16) est réfléchie par les parois inclinées (36, 38) des renfoncements coniques (34), puis émerge des microprismes (28) sous la forme d'une source de lumière orientée dans l'espace. Un groupement de microlentilles lenticulaires (60) peut être placé de manière à accepter la sortie desdits microprismes (28), la lumière sortant de ces microlentilles (60) constituant ainsi une source de lumière sensiblement collimatée.

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