Molded multifocal lens and mold assembly
AssigneeCamelot Industries Corporation
InventorAlban J. Lobdell
Life of this patent
Estimating the term…
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.
Claims11
In a mold assembly for casting plastic lenses, said assembly including first and second mold members spaced from one another by gasket means to define a chamber within which a plastic lens is to be cast;
- the improvement comprising wherein said gasket means includes indicia defining means for forming indicia on the edge of a lens cast from thermosetting plastic in said chamber said idicia defining means being located at fixed positions along said edge in respect to interlocking means formed on one of said first and second mold members and on said gasket means and wherein the location of said indicia corresponds to optical surface characteristics of the lens.
In a molded multifocal lens otherwise having no inherently visible multifocal lens features, the improvement comprising a plurality of notches formed by a gasket having notch defining means, said notches being formed at the time of molding and located in the edge thereof at precise positions around said lens for use in visually identifying by means of the unaided human eye and locating specific optical features of and on said lens.
Dependencies are inferred from the claim text.