Casting apparatus for plastic lenses

Details Casting apparatus for plastic lenses Casting apparatus for plastic lenses

1977-05-13

1978-06-20

Flint, Jr., J. Howard

Static molds

Including means to adjust mold volume during molding

249117, 425808, B29C 500, B29D 1100

Patent

active

040957721

ABSTRACT:
A process and apparatus particularly suited for casting ophthalmic lenses from a liquid monomer such as "Cr-39". The liquid monomer and a catalyst are metered into a plastic lower mold member. A plastic upper mold member is supported by the upper surface of the liquid and by a suspension arrangement which includes a spacer ring and a plurality of ears extending from the upper mold member. The upper mold member is controllably drawn downwardly as the liquid plastic solidifies. Optical surfaces are obtained without polishing or other finishing.

REFERENCES:
patent: 2304217 (1942-12-01), Tillyer
patent: 2332674 (1943-10-01), Smith
patent: 2333051 (1943-10-01), Smith
patent: 2373201 (1945-04-01), Smith
patent: 3211811 (1965-10-01), Lanman
patent: 3273204 (1966-09-01), Craddock
patent: 3278654 (1966-10-01), Grandperret
patent: 3674587 (1972-07-01), Laliberte

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