Method of lens casting without using a gasket

Details Method of lens casting without using a gasket Method of lens casting without using a gasket

B - Operations, Transporting

29

D

B29D 11/00 (2006.01) B29C 33/00 (2006.01) B29C 33/30 (2006.01) B29C 39/40 (2006.01) B29C 37/00 (2006.01)

Patent

CA 2367835

An apparatus and method for casting a lens without using a gasket that can be used to form all powers and geometric shapes of lenses. An elastomeric strip (20) is used to wrap around the edges of two molds (40, 50) to form a sleeve- like structure, which in turn cooperates with the molds (40, 50) to form a molding cavity (31). Moreover, this sleeve-like structure does not crumple or shrink during the lens polymerization process. Instead, it allows the molds (40, 50) to slide axially within it to compensate for any shrinkage that occurs during the lens polymerization process.

La présente invention concerne un procédé et un dispositif permettant de couler une lentille sans utiliser de joint, lesquels procédé et dispositif conviennent à la formation de lentilles de toutes puissances et formes géométriques. On se sert d'une bande élastomère (20) pour entourer les bords des deux moules (40, 50) de façon à former une structure de manchon qui, en ce qui la concerne, coopère avec les moules (40, 50) pour former une cavité de moulage (31). En outre, cette structure de manchon n'est sujette ni à froissement, ni à rétrécissement pendant le processus de polymérisation de la lentille. Au contraire, elle permet aux moules (40, 50) de coulisser axialement dans le manchon de façon à corriger tout rétrécissement pouvant survenir pendant le processus de polymérisation de la lentille.

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