FILM INSPECTION METHOD AND FILM MANUFACTURING METHOD USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a method of inspecting irregularity of the surface of a resin film with high accuracy, and a film manufacturing method using the method and capable of obtaining a resin film with excellent surface quality.SOLUTION: A film inspection method includes: projecting light from light projection means toward a resin film; projecting transmission light penetrating the resin film or reflection light reflected on the surface of the resin film to a screen; taking a shadow image projected onto the screen into light reception means; and detecting irregularity of the surface of the resin film from the shadow image taken into the light reception means. A point light source is used as a light source of the light projection means.