Ophthalmic lens mold seal

Details Ophthalmic lens mold seal Ophthalmic lens mold seal

1991-12-06

1993-08-24

Bushey, Scott

Plastic article or earthenware shaping or treating: apparatus

Press forming apparatus having opposed press members

Male shaping member and female mold

249117, 249160, 264 11, 264313, 425808, B29D 1100

Patent

active

052383881

ABSTRACT:
An apparatus for molding a soft ophthalmic lens, having 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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patent: 5087015 (1992-02-01), Galley

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