| 摘要 |
PROBLEM TO BE SOLVED: To provide a defect inspection method and device for inspecting an internal defect of a long object having a substantially uniform continuous light guide part inside. SOLUTION: A hollow fiber membrane 1 is irradiated from its outside with light emitted from a line type fiber lighting device 2. While light shielding is carried out by a light shielding structure 5 so that direct light emitted from the line type fiber lighting device 2, reflected light generated when the light emitted by the line type fiber lighting device 2 is reflected on the outer surface of the hollow fiber membrane 1, and transmitted light transmitted through the hollow fiber member 1 to be emitted to the outside once are not incident on cameras 6a and 6b, an optical image formed by the light, which is radiated by the line type fiber lighting device 2 and guided in a hollow part 1a inside the hollow fiber membrane 1 to be emitted to the outside of the hollow fiber membrane 1, is photographed by the cameras 6a and 6b. A defect in the hollow fiber membrane 1 is detected by processing output signals from the cameras 6a and 6b. COPYRIGHT: (C)2007,JPO&INPIT
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