초록 ▼

A polymeric front optical element blank is provided which may be laminated to a rear optical element blank. The polymeric front blank comprises an optical element having an exterior convex surface and an interior concave surface, with an edge between the exterior convex surface and the interior conc

A polymeric front optical element blank is provided which may be laminated to a rear optical element blank. The polymeric front blank comprises an optical element having an exterior convex surface and an interior concave surface, with an edge between the exterior convex surface and the interior concave surface. The optical is provided with at least two projections 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 an 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. It is preferred that there are at least three projections extending away from and higher than the edge on a side of the optical element having the concave surface.

대표청구항 ▼

[ What is claimed:] [1.]1. A pair of ophthalmic lens blanks comprising a front lens blank and a rear lens blank nested against each other with a liquid, photocurable adhesive between said front lens blank and said rear lens blank, at least one of said front lens blank and said rear lens blank having

[ What is claimed:] [1.]1. A pair of ophthalmic lens blanks comprising a front lens blank and a rear lens blank nested against each other with a liquid, photocurable adhesive between said front lens blank and said rear lens blank, at least one of said front lens blank and said rear lens blank having topography above a surface of at least one of said lens blanks and on a surface of one of said lens blanks which prevents the other of said lens blanks from slipping out of nesting contact with said at least one of said lens blanks wherein said topography is selected from the group consisting of: a) at least two protrusions extending from a concave surface of one of said lens blanks, the other of said lens blanks nesting within said concave surface, said at least two protrusions extending high enough from said concave surface to make contact with an edge of said other lens blank nesting within said concave surface; and b) protrusions extending away from a convex side of one of said lens blanks and over an edge of said other lens blank nested against said convex side.