Method for molding ophthalmic lenses
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United States of America Patent
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-
Dec 21, 1982
Issued Date -
N/A
app pub date -
Feb 22, 1980
filing date -
Aug 10, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method of and apparatus for molding precisely shaped articles and particularly high minus precision lenses in which a charge of synthetic resin approximating the mass of the finished article is injected under relatively low pressure into a space, having a volume greater than that of the finished article, between optically finished, heated, relatively movable mold inserts. After injection the inserts are moved toward each other under pressure and controlling the cooling of the mass while under pressure to provide uniformly timed solidification of all parts of the mass thus to form the article without the necessity of either high injection pressure or overflow from the mold cavity.
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