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1. (WO2018180492) METHOD FOR MANUFACTURING RETARDATION FILM

Pub. No.:    WO/2018/180492    International Application No.:    PCT/JP2018/009934
Publication Date: Fri Oct 05 01:59:59 CEST 2018 International Filing Date: Thu Mar 15 00:59:59 CET 2018
IPC: G02B 5/30
Applicants: FUJIFILM CORPORATION
富士フイルム株式会社
Inventors: NAGANO Satoshi
長野 諭史
OI Yuki
大井 佑記
HASEGAWA Masataka
長谷川 昌孝
Title: METHOD FOR MANUFACTURING RETARDATION FILM
Abstract:
The present invention provides a method for manufacturing a retardation film capable of suppressing the axial displacement distribution of a liquid crystal compound. The method for manufacturing a retardation film comprises: a step of forming a first coating film by applying and drying an alignment-layer forming material on a continuous film support being conveyed; a step of forming an alignment layer by irradiating the first coating film with polarized ultraviolet light; a step of forming a second coating film by applying and drying a liquid-crystal layer forming material on the alignment layer; and a step of forming a liquid crystal layer by aligning and setting the liquid crystal compound in the second coating film. The continuous film support whereon the first coating film is formed is wound around a temperature controllable backup roll when forming the alignment layer to irradiate the continuous film support with polarized ultraviolet light. The light output from a rod-shaped light source is polarized with a wire grid polarizer to create the polarized ultraviolet light. The wire grid of the wire grid polarizer is arranged at an angle θ that is perpendicular to or not parallel to the longitudinal direction of the backup roll and a louver is positioned between the rod-shaped light source and the wire grid polarizer.