A method for adding a thermoset overmold layer to a lens...

Details A method for adding a thermoset overmold layer to a lens... A method for adding a thermoset overmold layer to a lens...

B - Operations, Transporting

29

D

B29D 11/00 (2006.01) B29C 37/00 (2006.01) B29C 45/04 (2006.01)

Patent

CA 2691219

A method and coating used to prepare a photo chromically-enabled bifocal ophthalmic lens. The method and equipment includes injection molding a single vision lens (10e), for example, from polycarbonate. The clamp opens vertically and the top insert (20) is exchanged for a bifocal mold (30) having a base curve similar to the single vision lens. The thermos et coating includes compounds from several acrylate classes, and is applied to the single vision lens. The coating may include a photochromic dye. The coating is also formulated to receive a photochromic solution through an imbibition process.

L'invention concerne un procédé et un revêtement utilisés pour préparer une lentille ophtalmique bifocale activée chromiquement. Le procédé et l'équipement comprennent le moulage par injection d'un verre unifocal (10e), par exemple à partir de polycarbonate. Le dispositif de serrage s'ouvre verticalement et l'insert supérieur (20) est remplacé par un moule bifocal (30) ayant une courbe de base similaire au verre unifocal. Le revêtement thermodurcissable comprend des composés provenant de plusieurs classes d'acrylate, et est appliqué à un verre unifocal. Le revêtement peut comprendre une teinte photochromique. Le revêtement est également formulé pour recevoir une solution photochromique par un procédé d'imbibition.

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