| 摘要 |
PROBLEM TO BE SOLVED: To enable a striated defect occurring in an optical sheet to be detected automatically with high sensitivity in a production line of the optical sheet. SOLUTION: A method for inspecting the optical sheet is provided, in which the optical sheet (lenticular lens sheet 1) is illuminated, and its reflection light is received by a striated region imaging means 11, and reception light intensity of the reflection light is measured from an image signal acquired by the striated region imaging means 11, and the striated defect 7 is detected. In the method, an imaging visual field 12 of the striated region imaging means 11 is brought to traverse the surface of the optical sheet while keeping the orientation of the imaging visual field 12 constant to the optical sheet, and in this period, the striated region imaging means 11 receives the reflection light sequentially or simultaneously under such a plurality of conditions that angles (incidence anglesα) between illumination light 21a, 21b and the reflection light received by the striated region imaging means are different from each other, and the striated defect is detected from abnormal intensity in the reception light intensity. COPYRIGHT: (C)2007,JPO&INPIT
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