Ophthalmic lens mold seal

Details Ophthalmic lens mold seal Ophthalmic lens mold seal

B - Operations, Transporting

29

D

B29D 11/00 (2006.01) B29C 33/00 (2006.01) B29C 33/42 (2006.01) B29C 43/36 (2006.01) B29D 11/02 (2006.01)

Patent

CA 2084634

An apparatus and method for molding a soft ophthalmic lens, comprised of a male and female portion, one having around the periphery of the optical surface a knife edge and one containing a rim bushing peripherally exterior to the knife edge. The two portions are mated so that the knife edge deformably penetrates the other portion. Excess material is expelled from the mold cavity and separated from the lens by a region of prepolymer discontinuity defined by the rim bushing contact area. The mold portion containing the rim bushing is produced by using a cylindrical insert and an annular sleeve machined to have the rim bushing on the surface of one end.

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