Casting process for plastic lenses
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United States of America Patent
Stats
-
Mar 4, 1980
Issued Date -
N/A
app pub date -
Jan 19, 1978
filing date -
May 13, 1977
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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