Foreign body inspecting method, inspecting device, film roll, and method of manufacturing film roll

A method of inspecting a foreign body mixed in a film roll, the method comprising:

• a first foreign body detecting process that detects a foreign body on a film conveyed before being wound up into the film roll with an optical imaging unit and obtaining foreign body information including at least positional plane coordinates information A on the film for the foreign body;
• a process of winding up the film on a core as the film roll after the first foreign body detecting process;
• a converting process of converting a position of the foreign body on the positional plane coordinates information A into positional information on positional space coordinates information B in the wound film roll;
• and
• a second foreign body detecting process of using a radiation imaging unit to the film roll, focusing the radiation imaging unit to adjust imaging focus on a foreign body targeted for detection and characterization based on the positional space coordinates information B for the foreign body, and emitting radiation by the radiation imaging unit to detect and characterize the targeted foreign body.

An inspecting device inspecting a foreign body mixed in a film roll into which a film is wound up, the inspecting device comprising:

• an optical imaging unit imaging a film conveyed before being wound up into the film roll;
• an image processing unit detecting a foreign body from an image captured in the optical imaging unit;
• a storing unit storing foreign body information including at least a position of the foreign body on positional plane coordinates information A on the film for the foreign body detected in the image processing unit;
• a converting unit converting the position of the foreign body on the positional plane coordinates information A into a position of the foreign body on positional space coordinates information B on the wound film roll;
• a radiation imaging unit detecting radiation emitted from a radiation source and performing imaging;
• a focusing unit moving the radiation source relative to the film roll to focus the radiation imaging unit for the position of the foreign body on the converted positional space coordinates information B to be focused on for imaging;
• and
• a characterizing unit detecting and characterizing the foreign body based on radiation intensity of the radiation imaging unit.