Molding method for manufacturing thin thermoplastic lenses

Details Molding method for manufacturing thin thermoplastic lenses Molding method for manufacturing thin thermoplastic lenses

B - Operations, Transporting

29

C

B29C 45/57 (2006.01) B29C 45/56 (2006.01) B29D 11/00 (2006.01)

Patent

CA 2366376

Disclosed are novel molding methods for manufacturing thin thermoplastic lenses and, in particular, minus ophthalmic lenses that have thickness of about 1 mm or less at the thinnest point thereof. The molding mehtods disclosed provide for lenses which lack any abrasion or polishing artifacts on the surface and also lack any negative fining marks below the nominal surface.

Cette invention a trait à de nouvelles techniques de moulage permettant de fabriquer des lentilles minces thermoplastiques, notamment des lentilles ophtalmiques concaves, d'une épaisseur d'environ 1 mm ou moins au point le plus mince. Ces procédés de moulage permettent d'obtenir des lentilles ne nécessitant pas un surfaçage par abrasion ou polissage et qui sont également exemptes de marques négatives d'affinage sous la surface nominale.

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