Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
September 23, 2008
Patent Application Number
11759976
Date Filed
June 8, 2007
Patent Primary Examiner
Patent abstract
First and second polarizing plates are placed to be crossed nicols across a film to be inspected. A light source projects light toward the film through the first polarizing plate. Alight receiver receives the light transmitted through the film and the second polarizing plate. When θ1 represents an angle formed between an optical axis of the light receiver and a normal line that is perpendicular to the film surface, and θ2 represents a rotational angle formed between the optical axis and a reference line that is orthogonal to a slow axis of the film, the light receiver is positioned to satisfy the following conditions:
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