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US 12,358,244 B2Granted
Casting a lens with surface microstructures
AssigneeEssilor International
InventorsHao-Wen Chiu, Aref Jallouli
Life of this patent
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Abstract
A mold element (350) is fabricated (305, 310, 315) using a first mold (5) with which microstructures (323) are integrally formed in relief on the mold element (350). A lens (340) is cast (320, 325, 330, 335) using a second mold (7) that includes the mold element (350) such that the microstructures (337) are integrally formed on the lens (340).
Claims10
A method comprising:
- fabricating an upper thermoplastic mold element by thermoplastic injection molding, using a first mold with which microstructures are integrally formed in relief on the upper thermoplastic mold element;
- and
- casting a lens by a thermoset casting technique, in a second mold that comprises the upper thermoplastic mold element, a lower mold element, and a gasket or tape to retain the upper thermoplastic mold element separated from the lower mold element, wherein the upper thermoplastic mold element, lower mold element, and gasket or tape form a chamber into which a monomer is filled and cured through thermosetting such that a microstructure pattern is integrally formed on the lens,
- wherein the microstructures on the upper thermoplastic mold element are in relief with respect to the microstructure pattern on the lens.
1 more element
Dependencies are inferred from the claim text.