Infrared ray identification information media, the ink ribbon for this media formation, production manner of this media, and the printed matter null backing material which uses

摘要

PROBLEM TO BE SOLVED: To obtain an information medium having a pattern layer which has sufficient infrared-ray absorption characteristics and superior wear resistance and can be discriminated with infrared rays without being affected by the particle size, etc., of an infrared-ray absorbing material by incorporating infrared-ray reflective particles of partial size within a specific range in an infrared-ray reflecting pattern layer. SOLUTION: The infrared-ray discrimination information medium 1 has an infrared-ray absorbing layer 3 and infrared-ray reflecting pattern layer 4 on a base material 2 in this order. This infrared-ray reflecting pattern layer 4 contains infrared-ray reflective particles of particle size within the range of 450-500nm and is then able to excellently reflect infrared rays of the wavelength range of 900-100nm. Further, this infrared-ray reflecting pattern layer 4 is also a layer which holds information in the form of a pattern. Here, the base material 2 is given excellent reflectivity to improve the absorptivity of the infrared-ray absorbing layer 3 to infrared rays.