Curved optical filters

G - Physics – 02 – B

Patent

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Details

G02B 27/28 (2006.01) G02B 5/20 (2006.01) G02B 5/30 (2006.01) H04N 13/02 (2006.01)

Patent

CA 2701769

Curved polarization filters and methods of manufacturing such filters are described in the present disclosure. An exemplary method includes laminating a planar polarization layer to a planar retarder layer at a predetermined orientation and bending the laminate to create a curved filter. The strain on the retarder layer results in stress- induced birefringence, and the predetermined orientation of the retarder substantially compensates for the stress-induced birefringence. In some embodiments, the predetermination is based on mathematical models. In some other embodiment, the predetermination is based on experimental data.

L'invention concerne des filtres de polarisation incurvés et des procédés de fabrication de tels filtres. Un exemple de procédé comprend la stratification d'une couche de polarisation plane sur une couche de retardateur plane à une orientation prédéterminée et la flexion du stratifié pour créer un filtre incurvé. La déformation de la couche de retardateur conduit à une biréfringence induite par contrainte, et l'orientation prédéterminée du retardateur compense sensiblement la biréfringence induite par contrainte. Dans certains modes de réalisation, la prédétermination est fondée sur des modèles mathématiques. Dans un autre mode de réalisation, la prédétermination est fondée sur des données expérimentales.

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