Method and assembly for molding optical lenses

Details Method and assembly for molding optical lenses Method and assembly for molding optical lenses

1978-09-12

1981-03-24

Lowe, James B.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

249 82, 249139, 249160, 425808, B29D 1100

Patent

active

042579880

ABSTRACT:
A method and assembly for molding plastic optical lenses. The mold assembly comprises an annular retainer ring supporting a pair of generally disc shaped mold parts urged toward each other by a resilient force while separated by one or more gaskets, preferably including at least one soft gasket of uniform thickness between its inside and outside diameters which has the property of softening at elevated temperatures. When the cavity formed between the mold parts and bounded peripherally by the gaskets is filled with a resin formulation in the form of a liquid which then polymerizes when raised to an elevated curing temperature, shrinking and becoming hard and insoluble at room temperature, in the process the softening of the gasket permits the mold parts, under the action of the resilient force, to move towards each other to maintain contact with the formulation as it shrinks and hardens. A nest in which the assembly in the retainer ring is mounted has attached thereto a spring biased clamp arm for exerting the resilient force to urge the mold parts towards each other, the direction and location of such force being precisely determinable relative to the mounted retainer ring.

REFERENCES:
patent: 2266169 (1941-12-01), Crumrine
patent: 2333051 (1943-10-01), Smith
patent: 2890486 (1959-06-01), Crandon
patent: 3038210 (1962-06-01), Hungerford
patent: 3222432 (1965-12-01), Grandperret
patent: 3364525 (1968-01-01), Davy et al.
patent: 3404861 (1968-10-01), Ewer
patent: 3528135 (1970-09-01), Reiterman
patent: 3871803 (1975-03-01), Beattie
patent: 4095772 (1978-06-01), Weber

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