公开(公告)号：JP2002310924A

公开(公告)日：2002-10-23

申请号：JP2001118397

申请日：2001-04-17

Applicant: TORAY INDUSTRIES

Inventor： ISHIKAWA KOJI ,  HIRATA HAJIME ,  KITAHARA YASUSHI

IPC: G01N21/892 ,  B29C47/08 ,  B29K77/00 ,  B29L7/00 ,  G01N21/894

Abstract: PROBLEM TO BE SOLVED: To provide a sheet defect inspecting device with high accuracy in distinguishing defects capable of highly accurately determining the size of defects, especially pinhole, membrane, and air bubble defects which occur on a sheet, highly accurately distinguishing the defects, and reducing over detection of the defects. SOLUTION: In the defect inspecting device for detecting defect signals from among signals outputted from a light receiving part, a light source is arranged on one surface side of the sheet transferred by a sheet transfer means, and the light receiving part with an image pickup element is arranged on the other surface side. A plate for correcting the quantity of light is provided between the light source and the sheet.