Patent ID: 7738102
Filing Date: 2010-06-15
Classification: G01N

Abstract:
1. A layered film fabrication method comprising the steps of fabricating a layered film by layering at least a polarizing plate and a retardation layer, and performing defect inspection of the fabricated layered film, wherein the defect inspection step includes the steps of: irradiating a light on the layered film from a light source arranged on one side of a film surface of the layered film; imaging a transmitted light image of the layered film by an imaging unit arranged on the other side of the film surface; detecting a defect existing in the layered film based on the transmitted light image imaged by the imaging unit; and adjusting a relative angle position of a polarizing axis of an inspection polarization filter arranged on a light path between the film surface and the imaging unit and a polarizing axis of the polarizing plate; and the relative angle position adjustment of the polarization filter includes adjusting a relative angle position x of the polarization filter in a range of 0°<x≦15° so that a light quantity of a visible light entered to the imaging unit becomes a minimum value.