Print media surface structure which is formed by printing a dot pattern, printing methods, and the method of reading

摘要

In order to realize a so-called stealth dot pattern that cannot be visually recognized by simply improving the existing printing technology, the dot pattern is provided on the medium surface. A dot pattern reading system that irradiates infrared light or ultraviolet light on the surface, reads the reflected light with an optical reading means, recognizes the dot pattern, converts it into data corresponding thereto, and outputs characters, sounds, images, etc. In the medium surface on which the dot pattern used is formed, the dots constituting the dot pattern were provided by printing on the medium surface using ink of any color that reacts in the infrared or ultraviolet wavelength region.