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1. (WO2017039717) METHOD OF MAKING OPTICAL FILMS AND STACKS

Pub. No.:    WO/2017/039717    International Application No.:    PCT/US2015/052139
Publication Date: Fri Mar 10 00:59:59 CET 2017 International Filing Date: Sat Sep 26 01:59:59 CEST 2015
IPC: G02C 7/12
G02B 5/30
B29D 11/00
Applicants: 3M INNOVATIVE PROPERTIES COMPANY
Inventors: AMBUR, Gregg A.
WONG, Timothy L.
OUDERKIRK, Andrew J.
YUN, Zhisheng
Title: METHOD OF MAKING OPTICAL FILMS AND STACKS
Abstract:
Methods of making optical films and optical stacks are described. A method of making an optical stack includes providing a thermoform tool centered on a tool axis and having an external surface rotationally asymmetric about the tool axis; heating an optical film resulting in a softened optical film; conforming the softened optical film to the external surface while stretching the softened film along at least orthogonal first and second directions away from the tool axis resulting in a conformed optical film rotationally asymmetric about an optical axis of the conformed film where the optical axis coincident with the tool axis; cooling the conformed optical film resulting in a symmetric optical film rotationally symmetric about the optical axis; and molding an optical lens on the symmetric optical film resulting in the optical stack.