| 摘要 |
PROBLEM TO BE SOLVED: To provide a defect discrimination device and a defect discrimination method capable of effectively discriminating a kind of an irregularity defect which has generated on a surface of a sheet-like material with light permeability, and a sheet-like material which has been discriminated for defect. SOLUTION: The defect discrimination device includes, on a travel route of the sheet-like material with light permeability, a first irradiation means 2 irradiating the sheet-like material with parallel light, a first screen 4 projecting light through the sheet-like material from the first irradiation means, a first image means 6 imaging light projected on the first screen, a second irradiation means 3 irradiating the sheet-like material with parallel light from a position nearer to the sheet-like material than the first irradiation means, a second screen 5 disposed maintaining the same distance as that between the first irradiation means and the first screen, and a second image means 7 imaging light projected on the second screen. The kind of an irregularity defect which has generated on a surface of the sheet-like material is discriminated by comparing and checking the defect information obtained from the first image means and the defect information obtained from the second image means. COPYRIGHT: (C)2011,JPO&INPIT
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