C - Chemistry – Metallurgy – 03 – B
Patent
C - Chemistry, Metallurgy
03
B
C03B 8/02 (2006.01) C03B 19/12 (2006.01) C03C 17/02 (2006.01) G02B 5/02 (2006.01)
Patent
CA 2341408
A surface LSD is produced by embossing or molding light shaping structures onto a high quality optical glass or by embossing light shaping structures on a glass film layer coated onto a substrate. A sol-gel solution (70) is mixed at room temperature (72) and the mixture is coated, dipped or spun (74) on a substrate. A rubber submaster carrying the light shaping structures is pressed (76) into the mixture during gelation. The structured gel is then heat treated (78) and consolidated (79) into an LSD glass. The surface LSD has a transmission efficiency of over 90 % from the Ultraviolet wavelengths through the physical spectrum and into the near-infrared.
L'invention concerne un diffuseur holographique (LSD) de surface fabriqué en gravant ou en moulant des structures holographiques sur un verre optique de haute qualité ou en gravant des structures holographiques sur une couche de verre recouvrant un substrat. On mélange une solution sol-gel (70) à température ambiante (72), et on recouvre, immerge ou file (74) un substrat au moyen de ce mélange. On presse une sous-bande maîtresse en caoutchouc portant les structures holographiques (76) dans le mélange pendant la gélification. On traite ensuite à chaud (78) le gel structuré et on le consolide (79) en un verre LSD. L'efficacité de transmission de la surface LSD est supérieure à 90 % en partant des longueurs d'onde ultraviolettes en passant à travers le spectre physique et en allant dans l'infrarouge proche.
Goudreau Gage Dubuc
Physical Optics Corporation
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