Method for molding optical plastic lenses of the standard and bifocal type
First Claim
1. A method of producing an ophthalmic toric lens without utilization of a gasket and comprising the steps ofsupporting a lower mold in a predetermined and selected orientation,filling said lower mold with a resin material,positioning an upper mold in vertically spaced and non-compressive relationship to said lower mold, whereby said resin material is displaced to extend between the overlapping surfaces of said molds to form the configuration of said lens,curing said resin material situated between said molds,cooling said resin material and said molds, whereby said lower mold is capable of movement to compensate for shrinkage of said resin material, andseparating said lens from between said molds.
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Accused Products
Abstract
A bifocal lens is produced on either a previously formed blank lens, or completely in a singular casting between two molds. The bifocular lens is obtained by supporting a bifocal lower mold having a recessed bifocal well area on itsconcave surface and filling the lower mold with a resin material. By positioning an upper mold in vertically spaced relationship to the lower mold, the resin material is displaced to extend between the overlapping surfaces of the molds to form the configuration of the bifocal lens with a bifocular portion on the convex lens surface corresponding to the bifocal well on the lower mold. Curing of the resin material situated between the molds and cooling the resin material and the molds forms the complete lens. Thereafter a separating of the bifocal lens from between the molds leaves the bifocal lens in a position to be completed and installed in a pair of eye glasses. Single vision ophthalmic lenses are similarly produced by means of the aforedescribed method.
201 Citations
38 Claims
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1. A method of producing an ophthalmic toric lens without utilization of a gasket and comprising the steps of
supporting a lower mold in a predetermined and selected orientation, filling said lower mold with a resin material, positioning an upper mold in vertically spaced and non-compressive relationship to said lower mold, whereby said resin material is displaced to extend between the overlapping surfaces of said molds to form the configuration of said lens, curing said resin material situated between said molds, cooling said resin material and said molds, whereby said lower mold is capable of movement to compensate for shrinkage of said resin material, and separating said lens from between said molds.
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14. A method of producing an ophthalmic toric bifocal lens comprising the steps of
supporting a bifocal mold having a recessed bifocal well area portion on this concave surface, filling said bifocal mold with a resin material, positioning the convex front surface of a single focus lens having an astigmatic axis in overlapping and selectively spaced relationship with respect to said concave surface of said bifocal mold whereby said resin contained in said recessed portion is in contact with said convex front surface of said lens for subsequent formation of a thin plastic film from said resin, curing the assembly of said resin material and said lens, cooling said mold and said resin material which has formed said thin plastic film, whereby said lower mold is capable of movement to compensate for shrinkage of said resin material, separating said lens from said mold, and said thin plastic film on said lens having one portion corresponding to the recess in said mold being thicker than the rest thereof, thereby creating a bifocular portion.
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24. A method of producing an ophthalmic toric bifocal lens comprising the steps of
supporting a bifocal lower mold having a recessed bifocal well area on its concave surface, filling said lower mold with a resin material, positioning an upper mold in vertically and selectively spaced relationship to said lower mold, whereby said resin material is displaced to extend between the overlapping surfaces of said molds to form the configuration of said bifocal lens with a bifocular portion on the convex lens surface corresponding to said bifocal well on said lower mold, curing said resin material situated between said molds, cooling said resin material and said molds, whereby said lower mold is capable of movement to compensate for shrinkage of said resin material, and separating said bifocal lens from between said molds.
Specification