Lenses for holographic spectacles

G - Physics – 02 – C

Patent

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Details

G02C 7/02 (2006.01) G02B 27/22 (2006.01) G02C 7/00 (2006.01) G02C 11/02 (2006.01)

Patent

CA 2212847

Lenses for holographic spectacles comprise an optically transparent base (1) on the inner surface (facing the wearer) of which a layer (2) of recording material is deposited, at least one three-dimensional hologram being recorded in the material. The layer (2) is made of a material which is transparent in the spectral range in which the diffraction efficiency of the hologram is greatest. Beyond the hologram layer (2) (towards the wearer), at least one compensation layer (3) is provided. This layer is made from a selectively absorbent material with higher absorption of radiation in the spectral range indicated above and maximum transparency to radiation outside that range. In order to create an integrated structure, these lens components are joined using an optical adhesive. The invention significantly reduces three- dimensional modulation of the radiation passing through the lens resulting from the holographic image and thereby reduces colour contrast along the lens aperture.

Cette invention concerne des lentilles pour lunettes holographiques comprenant une base transparente (1) sur la surface interne de laquelle, et en direction de l'utilisateur, a été déposée une couche (2) d'un matériau enregistreur, un hologramme tridimensionnel au moins ayant été enregistré dans ledit matériau. Cette couche (2) est faite d'un matériau qui est transparent dans la zone du spectre pour laquelle l'efficacité de diffraction de l'hologramme est maximale. Derrière la couche (2), du côté de l'utilisateur, qui comporte l'hologramme se trouve au moins une couche de compensation (3) faite d'un matériau absorbant sélectif, lequel a une forte capacité d'absorption de rayonnement dans ladite zone du spectre, ainsi qu'une perméabilité maximale hors de cette zone. Afin d'obtenir une structure intégrée, ces éléments sont liés les uns aux autres l'aide d'une colle optique. Cette invention permet de diminuer de manière sensible la modulation spatiale du spectre passant à travers les lentilles, laquelle modulation est due à la formation de l'image holographique, et de réduire le contraste des couleurs le long de l'ouverture des lentilles.

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