Magnetically attached spectacle lens with hidden magnets and method
A magnetically attached spectacle lens wherein magnets are embedded in the rear surface of the lens in a circumferential groove near the periphery of the lens. The magnets are spaced around the periphery of the lens, and are held in the groove by preferably a wicked in cyanoacrylate adhesive. The spaces between the magnets are preferably filled with a light activated potting compound. Prior to installation of the magnets, the inside of the groove is painted, preferably by spraying, with an opaque paint whereby the magnets are hidden from the view of onlookers. During fabrication, after magnet installation, any overspray from the painting step is removed by using a solvent preferably applied by moistened swabs or cloth.
1. A method for hiding magnets embedded in a spectacle lens comprising:
providing a spectacle lens having a rear surface;
cutting a groove in said rear surface near the periphery of said lens;
painting at least the interior of said groove with a soluble paint and allowing said paint to dry;
providing a plurality of magnets and positioning them in said groove;
introducing an adhesive into the gaps between said magnets and the walls of said groove;
curing said adhesive;
filling the regions of said groove between said magnets with a clear photo-activatable potting compound;
exposing said photo-activatable potting compound to a light source until cured; and
removing any exposed paint on the surface of said spectacle lens by applying a solvent.
2. A method for hiding magnets embedded in a spectacle lens as recited in claim 1 wherein said soluble paint is soluble in alcohol, and said solvent is alcohol.
3. A method for hiding magnets embedded in a spectacle lens as recited in claim 1 wherein said paint is an acrylic paint and said solvent is alcohol.
4. A method for hiding magnets embedded in a spectacle lens as recited in claim 1 wherein said paint is applied by spraying.
5. A method for hiding magnets embedded in a spectacle lens as recited in claim 1 wherein said magnets are narrower than said groove by between about 0.001 inch and about 0.002 inch.
6. A method for hiding magnets embedded in a spectacle lens as recited in claim 1 wherein said magnets are narrower than said groove by between about 0.001 inch and about 0.005 inch.
7. A method for hiding magnets embedded in a spectacle lens as recited in claim 1 wherein said adhesive is a wicking grade cyanoacrylate.
8. A spectacle lens comprising:
a lens having a predetermined periphery and a rear surface;
a groove in said rear surface near the periphery of said lens;
a film of opaque paint covering the surface of said groove;
a plurality of magnets positioned in said groove;
a film of adhesive in the gaps between said magnets and said paint; and
clear filler filling the spaces in said groove between said magnets.
9. A spectacle lens as recited in claim 8 wherein said adhesive is a wicking grade of cyanoacrylate.
10. A spectacle lens as recited in claim 8 wherein said clear filler is photo-activated.
11. A spectacle lens as recited in claim 8 wherein said opaque paint is an acrylic paint.