Process for applying a coating onto a fresnel lens forming...

B - Operations – Transporting – 29 – D

Patent

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B29D 11/00 (2006.01)

Patent

CA 2725056

The present invention is directed to a process for coating at least one geometrically defined surface of an optical article's substrate, without generating optical defects, said surface forming a Fresnel lens (2), comprising: providing a removable plastic carrier (4) having a specific thickness and a specific base curvature, depositing a curable coating composition (3) onto either the at least one surface forming a Fresnel lens or the internal surface of the carrier, moving the carrier and the optical article relatively to each other to bring the deposited curable coating composition into contact with either the at least one surface forming a Fresnel lens or the internal surface of the carrier, applying a specific pressure onto the external surface of the carrier to spread out the curable coating composition so as to cover said at least one surface forming a Fresnel lens, curing the layer of curable coating composition and withdrawing the removable carrier.

La présente invention se rapporte à un processus destiné à recouvrir au moins une surface géométriquement délimitée dun substrat dun objet optique, sans générer de défauts optiques, ladite surface formant une lentille de Fresnel (2), comprenant les étapes consistant à : utiliser un support plastique amovible (4) ayant une épaisseur spécifique et une courbure de base spécifique, déposer une composition de revêtement durcissable (3) sur la ou les surfaces formant une lentille de Fresnel ou sur la surface interne du support, déplacer le support et lobjet optique lun par rapport à lautre afin damener la composition de revêtement durcissable déposée en contact avec la ou les surfaces formant une lentille de Fresnel ou avec la surface interne du support, appliquer une pression spécifique sur la surface externe du support afin détaler la composition de revêtement durcissable de manière à recouvrir ladite ou lesdites surfaces formant une lentille de Fresnel, durcir la couche de composition de revêtement durcissable et retirer le support amovible.

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