Shaped plastic lenses and method for making the same
AssigneePolaroid Corporation
InventorNancy J. Gettens
Life of this patent
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Abstract
There is described a method for forming lenses having substantially no optical power. The method includes forming, via in situ polymerization, a layer of non-uniform thickness of an optically clear, high scratch-resistant polymeric material on the convex surface of the lens. The lenses provided by the method are characterized by having maximum thickness in the central region of the lens and gradually diminishing thickness radially towards the periphery of the lens.
Claims9
A shaped plastic lens convex on one side and concave on the other side and having substantially no optical power comprising a first substantially uniformly thick layer of thermoplastic polymeric material, a second substantially uniformly thick layer of thermoplastic polymeric material and a third thermoplastic layer of non-uniform thickness and having high scratch resistance, said third layer having maximum thickness in the central region thereof and diminishing gradually in thickness radially toward the periphery thereof, wherein said second substantially uniformly thick layer forms said concave side of the lens and said third layer forms said convex side of the lens.
Dependencies are inferred from the claim text.