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US 2020/0215842 A1Published application
Forgery prevention structure, forgery prevention medium, and method for inspecting forgery prevention structure
AssigneeGlory Ltd.
InventorKeitaro MUTA
Life of this patent
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Abstract
In order to perform high-accuracy authentication of a forgery prevention medium having a forgery prevention structure, the forgery prevention structure provided in or on the medium for performing authentication of the medium is formed so as to include a mixed area with a plurality of kinds of resonator structures each of which resonates with a terahertz electromagnetic wave having a different polarization direction.
Claims20
A forgery prevention structure for authenticating a medium, the forgery prevention structure comprising:
- the medium;
- and
- a plurality of kinds of resonator structures disposed in or on a mixed area of the medium, wherein a first kind of resonator structure resonates in response to being exposed to a first terahertz electromagnetic wave having a first polarization direction, and a second kind of resonator structure resonates in response to being exposed to a second terahertz electromagnetic wave having a second polarization direction, the first polarization direction being different than the second polarization direction.
A forgery prevention medium comprising:
- a plurality of kinds of resonator structures disposed in or on a mixed area of the forgery prevention medium, wherein a first kind of resonator structure resonates in response to being exposed to a first terahertz electromagnetic wave having a first polarization direction, and a second kind of resonator structure resonates in response to being exposed to a second terahertz electromagnetic wave having a second polarization direction, the first polarization direction being different than the second polarization direction.
A method for inspecting a forgery prevention structure, the method comprising:
- irradiating a mixed area of a forgery prevention medium of the forgery prevention structure with an inspection terahertz electromagnetic wave, the mixed area including a plurality of kinds of resonator structures, a first kind of resonator structure resonates in response to being exposed to a first terahertz electromagnetic wave having a first polarization direction, and a second kind of resonator structure resonates in response to being exposed to a second terahertz electromagnetic wave having a second polarization direction, the first polarization direction being different than the second polarization direction;
- detecting levels of the inspection terahertz electromagnetic wave that have been reflected or transmitted;
- and
- comparing a detected intensity, transmissivity, or reflectivity of the inspection terahertz electromagnetic wave with previously stored reference data to determine whether an article to which the forgery prevention medium is disposed is a forgery.
1 more element
Dependencies are inferred from the claim text.