公开(公告)号：US11697256B2

公开(公告)日：2023-07-11

申请号：US16480511

申请日：2018-01-26

申请人： Essilor International

发明人： Hao-Wen Chiu ,  Shannon Loiselle ,  Shawn Mcdermott

IPC分类号： B29D11/00 ,  G02B5/00 ,  B29K69/00 ,  B29K105/00

CPC分类号： B29D11/0048 ,  B29D11/00692 ,  G02B5/003 ,  B29K2069/00 ,  B29K2105/0005 ,  B29K2909/08

摘要： A method for injection molding of a weld line free minus power lens element comprises injecting a melt of thermoplastic material at a temperature higher than a glass transition temperature (Tg) of the thermoplastic material in an initial molding cavity delimited by two facing mold inserts, wherein the melt of thermoplastic material comprises at least one UV absorber. During the injecting, the two facing mold inserts are moved toward one another to define a final molding cavity whose volume is less than that of the initial molding cavity. After cooling and disassembling of the two facing mold inserts, the weld line free minus power lens element is recovered. One of the two facing mold inserts comprises a flat surface facing the initial molding cavity, thereby to form a flat surface on one side of the weld line free minus power lens element. The other of the two facing mold inserts comprises a convex surface facing the initial molding cavity, thereby to form a concave surface on an opposite side of the weld line free minus power lens element.

公开(公告)号：US11938694B2

公开(公告)日：2024-03-26

申请号：US16754883

申请日：2018-10-08

申请人： Essilor International

发明人： Hao-Wen Chiu ,  Shannon Loiselle

IPC分类号： B29D11/00 ,  B29C45/00 ,  B29C45/37 ,  B29C45/73 ,  B29C45/78 ,  G02B3/08 ,  B29K21/00 ,  B29K27/06 ,  B29K75/00 ,  B29L11/00

CPC分类号： B29D11/00269 ,  B29C45/0025 ,  B29C45/372 ,  B29C45/7306 ,  B29C45/78 ,  B29D11/00432 ,  G02B3/08 ,  B29C2045/7393 ,  B29C2945/7604 ,  B29C2945/7626 ,  B29K2021/003 ,  B29K2027/06 ,  B29K2075/00 ,  B29L2011/005

摘要： A method for producing an optical article having a Fresnel microstructure and an injection molding system for producing such an article. The method includes heating and cooling a mold and applying a pressure to a thermoplastic material during injection molding of the optical article to facilitate formation of the Fresnel microstructure.