Can lid inspection device, camera position adjustment method, and camera positioning jig

A can lid inspection device comprising:

• a ring-shaped illuminator for illuminating a can lid placed on an inspection table;
• a camera having a cylindrical lens holding cylinder;
• a pedestal base positioned above the ring-shaped illuminator having a circular inspection hole formed at a center, wherein the camera is mounted on the pedestal base at a position where the lens holding cylinder of the camera faces the inspection hole;
• a support pole including a lower end to which the ring-shaped illuminator is fixed and an upper portion supporting the pedestal base;
• a camera positioning jig for fitting between the pedestal base and the camera, including a ring-shaped body and a flange portion protruded from an outer peripheral surface of the ring-shaped body, the ring-shaped body including an outer diameter portion having an outer diameter corresponding to a diameter of the inspection hole of the pedestal base and an inner diameter portion having an inner diameter corresponding to an outer diameter of the lens holding cylinder of the camera, the outer diameter portion of the ring-shaped body being fitting in the inspection hole of the pedestal base, and the inner diameter portion of the ring-shaped body being fitting in the lens holding cylinder of the camera;
• an illumination center calibration jig configured to be detachably mounted on a lower surface of the illuminator, the illumination center calibration jig having a mark indicating a center of the illuminator;
• and
• an analysis device for receiving and analyzing an image of the can lid captured by the camera,
• wherein the camera positioning jig is detachable, and
• wherein the ring-shaped body of the camera positioning jig is configured by a partial ring-shaped body of a perfect ring-shaped body, the partial ring-shaped body having a center angle of 90° to 180°.