Patent ID: 11940640
Assignee: DAICEL-EVONIK LTD.
Field: Optics (Instruments)
Classification: CPC G  B | IPC G

Claim 0:
1. A method for producing a polarizing sheet having a curved shape, the method comprising:
placing a polarizing sheet including a polyamide resin film (1), a polarizing film, and a polyamide resin film (2) disposed in this order in such a manner that the polyamide resin film (1) side of the polarizing sheet is in contact with a mold heated at a temperature from 80 to 120° C. for curved surface molding;
bringing the sheet into close contact with the mold; and
transferring a shape of the mold by a vacuum molding method to the sheet to bring the sheet to have a curved shape,
wherein a retardation value of the polyamide resin film (1) is from 2000 to 2500 nm, and the retardation value of the polyamide resin film (1) and a retardation value of the polyamide resin film (2) satisfy Formula (r):
2000 nm<[Retardation Value of Polyamide Resin Film (1)]−[Retardation Value of Polyamide Resin Film (2)]<2500 nm (r).