Method of molding bifocal lenses

Details Method of molding bifocal lenses Method of molding bifocal lenses

1985-05-14

1986-09-30

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Including step of mold making

264 27, 425808, B29D 1100

Patent

active

046146245

ABSTRACT:
A method of simultaneously casting the convex and concave surfaces on a one piece crescent shaped segment bifocal lens. A metal mold is made by lathe cutting and polishing a first convex short radius optical surface in the central area of a metal disk shaped blank. The second longer convex radius optical surface having from 0.25 to 3.0 prism diopters and intersecting the first curve at the center of the blank is cut and polished on the metal blank.
A resinous bifocal concave mold is made by replication from the metal convex mold. A second convex resinous optical mold is aligned on the concave bifocal resinous mold and the space between filled with the liquid lens monomer. The monomer is polymerized to form a solid polymer bifocal lens.

REFERENCES:
patent: 2936674 (1960-05-01), Beasley
patent: 3460928 (1969-08-01), Cosko
patent: 3806079 (1974-04-01), Beattie
patent: 4163655 (1979-08-01), Campbell
patent: 4239712 (1980-12-01), Neefe
patent: 4279401 (1981-07-01), Ramirez et al.
"A No-Jump Bifocal Contact Lens", Mandell, Optometric Weekly, vol. 58, No. 22, pp. 19-21, Jun. 1, 1967.

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