Patent ID: 9057708
Filing Date: 2015-06-16
Classification: G01N

Abstract:
1. Inspection equipment for a mouth section of a bottle-can, with respect to the bottle-can having the cylindrical mouth section in which a curl portion is formed by curling an open end thereof for a cap with a liner to be put on, by taking an image of an imaging area which is set to include a part of the curl portion for detecting an asperity-defect at the curl portion, the inspection equipment comprising: a rotating device which holds and rotates the bottle-can around a can-axis; a first illumination device which irradiates a first illumination light substantially along a tangential direction of a cylindrical surface of the mouth section toward the curl portion in the imaging area; a second illumination device which irradiates a second illumination light having a different light color from that of the first illumination light toward a part in which the first illumination light is irradiated on the curl portion from an opposite side to the first illumination light with the imaging area therebetween along substantially a tangential direction of the cylindrical surface of the mouth section; a third illumination device which irradiates a third illumination light having a different light color from that of the first illumination light and the second illumination light toward the part in which the first illumination light and the second illumination light are irradiated on the curl portion along an intersecting direction; an imaging device which is disposed toward the imaging area and obtains an inspection image including a first reflected light of the first illumination light, a second reflected light of the second illumination light, and a third reflected light of the third illumination light at the curl portion; and an asperity-defect-recognition device which detects an edge position of the curl portion in the inspection image based on a third imaging result of the third reflected light of the third illumination light by following the third reflected light and regarding a position thereof as the edge position of the curl portion, and detects the asperity-defect in a prescribed width from the edge position based on a first imaging result of the first reflected light of the first illumination light and a second imaging result of the second reflected light of the second illumination light existing in the inspection image.