| 摘要 |
A method of producing an optical film comprising the step of: stretching a continuous resinous film by apply tension to a transverse direction of the resinous film while conveying the resinous film, wherein the stretching is carried out with a stretching apparatus comprising right and left edge holding devices which hold right and left edges of the resinous film; and, the right and left edge holding devices of the stretching apparatus each independently controls right and left edge holding distances of the resinous film so that a slow axis of the resinous film is substantially perpendicular or substantially parallel to a film conveying direction, provided that the edge holding distance is defined as a distance between an initiation position and a cessation position of holding of the edge of the resinous film. |
