| 摘要 |
In a method of manufacturing an optical film by a casting apparatus which comprises a support, a casting die provided at a casting section of the support and a pressure reducing device provided at the casting section, a temperature T of the support at the casting section is set to satisfy the formula (1): <?in-line-formulae description="In-line Formulae" end="lead"?>- 0.01 CS +0.005 DeltaP +5 <=T <=-0.125CS +0.04 DeltaP +17 ( 1 ) <?in-line-formulae description="In-line Formulae" end="tail"?> where CS represents the moving speed (m/min) of the support and DeltaP is a reduced pressure (Pa) at the back side of the dope ribbon by the reducing device.
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