Wafers for ophthalmic systems

Details Wafers for ophthalmic systems Wafers for ophthalmic systems

G - Physics

02

C

G02C 7/02 (2006.01) B29C 65/48 (2006.01) B29D 11/00 (2006.01)

Patent

CA 2344230

A polymeric front optical element blank is provided which may be laminated to a rear optical element blank. The polymeric front blank (2) comprises an optical element having an exterior convex surface (6) and an interior concave surface, with an edge (8) between the exterior convex surface and the interior concave surface. The optical is provided with at least two projections (10) which extend away from and higher than the edge on a side of the optical element having the concave surface. These projections assist in aligning a back optical element during lamination so that the two lenses will not move out of optical registry during lamination, especially where centrifugal forces are used to spread an adhesive between the front and rear lenses.

La présente invention concerne une ébauche d'élément optique frontale polymère pouvant être stratifiée sur une ébauche d'élément optique arrière. L'ébauche frontale polymère (2) comprend un élément optique présentant une surface convexe externe (6) et une surface concave interne, un bord (8) étant situé entre la surface convexe externe et la surface concave interne. L'élément optique comporte au moins deux saillies (10) qui s'étendent et s'éloignent en hauteur du bord latéral de l'élément optique à surface concave. Ces saillies facilitent l'alignement d'une ébauche d'élément optique pendant la stratification, de sorte que les deux lentilles ne se désalignent pas optiquement pendant cette opération, particulièrement lorsque les forces de centrifugation sont utilisées pour répartir un adhésif entre les lentilles frontale et arrière.

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