SECURITY ELEMENT
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Accused Products
Abstract
The invention relates to a security element (1), comprising a first luminescent substance, for a security document (5), the latter (5) comprising a base body (51) consisting of a base material. The aim of the invention is to increase the protection against forgery. To achieve this: the security element is provided with a second luminescent substance; energy is transmitted between the first luminescent substance and the second luminescent substance, whereby the frequency range of the excitation of one of the luminescent substances corresponds to the emission frequency range of the other luminescent substance; and the first luminescent substance is thermally unstable at the ignition temperature of the base material and/or at a temperature of 185° C.
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Citations
23 Claims
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1-11. -11. (canceled)
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12. A security element for a security document, comprising:
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a first luminescent substance which is thermally unstable, when a base material of the security document reaches a threshold temperature; and a second luminescent substance; wherein the first and second luminescent substances are constructed to allow an energy transmission therebetween, with an excitation frequency range of one of the first and second luminescent substances corresponding to an emission frequency range of the other one of the first and second luminescent substances, wherein the first and second luminescent substances jointly define a common first region, and wherein the first luminescent substance defines a second region. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A security document, comprising:
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a base body made of a base material; and a security element including a first luminescent substance which is thermally unstable, when a base material of the security document reaches a threshold temperature; and a second luminescent substance; wherein the first and second luminescent substances are constructed to allow an energy transmission therebetween, with an excitation frequency range of one of the first and second luminescent substances corresponding to an emission frequency range of the other one of the first and second luminescent substances, wherein the first and second luminescent substances jointly define a common first region, and wherein the first luminescent substance defines a second region.
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23. A method for verifying the authenticity and/or quality of a security document, comprising the steps of:
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exciting a first luminescent substance of a security element by a light source; exciting a second luminescent substance by an emission of the first luminescent substance; and determining a ratio of the emission of the first luminescent substance to an emission of the second luminescent substance.
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Specification