US 12,337,559 B2
Polarizing film, method for molding polarizing film, and method for producing polarizing lens
Aoi Matsue, Tokyo (JP); Terufumi Hamamoto, Tokyo (JP); and Teruo Yamashita, Tokyo (JP)
Assigned to HOYA LENS THAILAND LTD., Pathumthani (TH)
Appl. No. 17/059,825
Filed by HOYA LENS THAILAND LTD., Pathumthani (TH)
PCT Filed May 30, 2019, PCT No. PCT/JP2019/021525
§ 371(c)(1), (2) Date Nov. 30, 2020,
PCT Pub. No. WO2019/230884, PCT Pub. Date Dec. 5, 2019.
Claims priority of application No. 2018-104626 (JP), filed on May 31, 2018; application No. 2018-104627 (JP), filed on May 31, 2018; and application No. 2018-104628 (JP), filed on May 31, 2018.
Prior Publication US 2021/0213693 A1, Jul. 15, 2021
Int. Cl. G02B 5/30 (2006.01); B29D 11/00 (2006.01); G02C 7/12 (2006.01)
CPC B29D 11/00009 (2013.01) [B29D 11/00788 (2013.01); G02B 5/30 (2013.01); G02C 7/12 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A method for molding a polarizing film, the method comprising:
molding the polarizing film into a curved shape, wherein
when the polarizing film is molded, the polarizing film is heat-treated in a temperature range of Tg−20° C. or higher and Tg+10° C. or lower, where Tg is a glass transition point of a resin constituting the polarizing film,
one chamber is divided into a first space and a second space,
a molding die is disposed in the second space,
the polarizing film is disposed in the chamber,
the polarizing film is transfer-molded along a convex molding surface of the molding die by a differential pressure generated by making a pressure in the first space and a pressure in the second space different from each other, and
the convex molding surface of the molding die is configured to be in contact with only a portion of the polarizing film that is configured to be formed into a polarizing lens, wherein
a surface of the polarizing film facing the first space remains in a non-contact state during the transfer-molding.