Method and mold for making ophthalmic devices

B - Operations – Transporting – 29 – D

Patent

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B29D 11/00 (2006.01) B29C 33/38 (2006.01) B29C 33/40 (2006.01) B29C 33/44 (2006.01)

Patent

CA 2497175

This invention provides a method and a mold for improving the release of a molded ophthalmic device from a mold. The method comprises the steps of: providing a first mold half (20) and second mold half (440) each having opposing top surfaces at least one of which has been hollowed out to define a cavity for forming said ophthalmic device and at least the first mold half further defining a boundary (530) for a release element (120), the boundary is part of the cavity, the release element comprising a ramped surface (121), the cavity having a corresponding ramped surface, and the release element having its widest part near the top surface of the at least the first mold half that defines said release element therein. The mold of this invention has a hollowed-out portion as part of the cavity to provide a release element to the molded ophthalmic device.

L'invention concerne un procédé et un moule permettant d'améliorer la libération d'un dispositif ophtalmique moulé. Le procédé consiste à fournir une première moitié de moule (20) et une seconde moitié de moule (440), chacune ayant des surfaces supérieures opposées dont au moins une a été creusée de façon à définir une cavité permettant de former le dispositif ophtalmique, au moins la première moitié de moule définissant également une limite (530) d'un élément de libération (120). Ladite limite fait partie de la cavité et l'élément de libération comprend une surface inclinée (121), la cavité présente une surface inclinée correspondante, et la partie la plus large de l'élément de libération à proximité de la surface supérieure de la première moitié de moule y définit ledit élément de libération. Le moule selon l'invention présente une partie creuse qui fait partie de la cavité pour fournir un élément de libération au dispositif ophtalmique moulé.

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