PRINTED MATTER, PRINTED MATTER INSPECTION DEVICE, MANUFACTURING METHOD OF PRINTED MATTER, AND MANUFACTURING DEVICE OF PRINTED MATTER

摘要

A printed matter includes: a first sub image embedded in the main image which has the same color as a color of the main image in a human visual sense, and is printed with an ink to absorb light of an infrared wavelength band by a first absorption coefficient; and a second sub image embedded in the main image which has the same color as the color of the main image in a human visual sense, and is printed with an ink to absorb the light of the infrared wavelength band by a second absorption coefficient.