Method for producing optical lenses
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United States of America Patent
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-
Jun 6, 1995
Grant Date -
N/A
app pub date -
Aug 31, 1993
filing date -
Aug 31, 1993
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A method for casting plastic lenses includes a step in which lens forming materials having at least one liquid monomer and at least one photosensitive initiator are injected into a mold. The lens forming materials in the mold are subjected to ultraviolet light. The mold assembly is cooled in a liquid cooling bath. The temperature of the lens forming material within the mold is monitored, and the ultraviolet light is turned off when the temperature reaches a predetermined upper set point temperature. The ultraviolet light is turned on again when the temperature falls to a predetermined lower set point temperature. The process can be performed automatically with a programmable process control, which monitors the temperature, compares the temperature to the predetermined set point temperature, and turns the ultraviolet light on and off according to the results of the comparison.
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