Title:
IMPROVED METHOD AND APPARATUS FOR MOLDING OPTICAL PLASTIC LENS OF STANDARD AND TWO FOCUS POINT TYPE
Document Type and Number:
Japanese Patent JPS53124570
Kind Code:
A
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.
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Inventors:
MAACHIN GURESHIESU
Application Number:
JP2715978A
Publication Date:
October 31, 1978
Filing Date:
March 09, 1978
Export Citation:
Assignee:
GRESHES MARTIN
International Classes:
B29C39/00; B29C39/26; B29C39/38; G02C7/02; B29C61/00; B29D11/00; (IPC1-7): B29C5/00; G02B1/04; G02C7/02