COUNTERFEIT PREVENTING STRUCTURE, COUNTERFEIT PREVENTING MEDIUM, AND COUNTERFEIT PREVENTING STRUCTURE INSPECTING METHOD

• Main Author: MUTA, Keitaro
• Format: Patent
• Language: English; French; German
• Published: 06.01.2021
• Subjects: BOOK COVERS; BOOKBINDING; CHECKING-DEVICES; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDEDFOR; FILES; HANDLING OF COINS OR OF PAPER CURRENCY OR SIMILAR VALUABLEPAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING,DISPENSING, CHANGING OR DEPOSITING; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; LOOSE LEAVES; MEASURING; MOVABLE-STRIP WRITING OR READING APPARATUS; PERFORMING OPERATIONS; PHYSICS; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITYFEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOTOTHERWISE PROVIDED FOR; SPECIAL PRINTED MATTER; TESTING; TRANSPORTING

In order to perform high-accuracy authentication of a forgery prevention medium having a forgery prevention structure, a forgery prevention structure provided on a medium for performing authentication of the medium includes: an anisotropic resonator of which a transmissivity obtained when irradiated with a terahertz electromagnetic wave having a frequency at which the anisotropic resonator resonates, changes depending on a polarization direction of the terahertz electromagnetic wave; and an isotropic resonator of which a transmissivity obtained when irradiated with a terahertz electromagnetic wave having a frequency at which the isotropic resonator resonates, does not change depending on a polarization direction of the terahertz electromagnetic wave.