Mold for the casting of resin ophthalmic lenses having a prismat

Details Mold for the casting of resin ophthalmic lenses having a prismat Mold for the casting of resin ophthalmic lenses having a prismat

1978-02-09

1979-08-07

Flint, Jr., J. Howard

Static molds

Container-type molding device

425808, 65 37, 65 39, B29C 500, B29D 1100

Patent

active

041635418

ABSTRACT:
A mold for casting a resin ophthalmic lens is comprised of a glass disc defining a principal casting surface on one face thereof. The casting surface is a portion of a surface of revolution which has a first axis of symmetry and which has, at a location along such axis, an effective center of curvature. The principal casting surface has, in a selected portion thereof, a bottom surface defining in the mold a minor casting surface which is a portion of a surface of revolution having a second axis of symmetry. The first and second axes, if they intersect at all, intersect at a location on the first axis other than at substantially the center of curvature of the principal casting surface.

REFERENCES:
patent: 2272119 (1942-02-01), Jaeckel
patent: 2424235 (1947-07-01), Hoffer
patent: 3297422 (1967-01-01), Emerson et al.
patent: 3460928 (1969-08-01), Casko
patent: 3946982 (1976-03-01), Calkins et al.
patent: 3951203 (1976-04-01), Prunier
patent: 4095772 (1978-06-01), Weber

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