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US 12,226,968 B2Granted
Injection overmolding with heat/cool cycling for making optical lenses using 3D-printed functional wafers
AssigneeEssilor International
InventorsHaifeng Shan, Aref Jallouli, Hao-Wen Chiu
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Abstract
Disclosed herein is an injection molding method for making optical thermoplastic lenses using 3D—printed functional wafers. The method employs a variable injection molding cavity temperature that is heated to at least wafer Tg—10° C.
Claims8
A method for producing an optical article, the method comprising over-molding an additive manufactured functional wafer having a functional wafer glass transition temperature onto a convex surface of a base lens to produce an ophthalmic lens, wherein the over-molding comprises:
- affixing the functional wafer to a concave surface of an injection molding cavity;
- filling the injection molding cavity with molten base lens material;
- and
- raising the injection molding cavity temperature from a first temperature to a second temperature that is at least 10° C. less than the functional wafer glass transition temperature and up to and including 5° C. above the functional wafer glass transition temperature, such that Tg,wafer+5° C.≥Tcavity≥Tg,wafer−10° C.
1 more element
Dependencies are inferred from the claim text.