Molded multifocal lens and mold assembly

Details Molded multifocal lens and mold assembly Molded multifocal lens and mold assembly

1980-03-24

1984-04-10

Corbin, John K.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

249 53R, 249103, 264 11, 264 22, 425808, B29C 1100, B29D 1100, G02C 706

Patent

active

044417950

ABSTRACT:
A lens having a set of physical features provided on the edge thereof for permitting a set of reference marks to be placed on the lens surface together with an apparatus for applying these physical features to the lens. The apparatus comprises a mold assembly in which the gasket is provided with a plurality of precisely located ridges which define a plurality of corresponding notches formed on the edge of the lens to locate, for example, the distance portion optical center and the 0.degree.-180.degree. lines of a progressive power lens. The gasket is additionally provided with other ridges adapted to mate with grooves formed on the mold member defining the progressive lens surface to ensure proper alignment of that member with the gasket.

REFERENCES:
patent: 1171419 (1916-02-01), Fink
patent: 1416947 (1922-05-01), Dey
patent: 2033101 (1936-03-01), Tillyer et al.
patent: 2140410 (1938-12-01), Titmus
patent: 2704010 (1955-03-01), Lantz
patent: 3674587 (1972-07-01), LaLiberte
patent: 3881683 (1975-05-01), Whitney

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