摘要:
A multilayer card-shaped data carrier has a core layer based on paper, with an individualization formed in the layer. At least a part of the area of the data carrier is deformed into a relief which has a viewing angle-dependent optical effect and which extends into the core layer through the cover layer.
摘要:
A security element including: a plurality of focusing elements, a plurality of image regions where each image region is associated with a focusing element, each image region is printed with at least two layers, the first layer is offset by a first predetermined amount from a reference axis in the image region, the second layer is offset by a second predetermined amount from a reference axis in the image region, each layer being in different colours, and each image region includes at least a first and second sub-region, wherein a first image is formed in a first range of viewing angles from the first sub-region and a second image is formed in a second range of viewing angles from the second sub-region.
摘要:
The invention relates to a datasheet (1) for integrating into a preferably book-like security and/or value document. The datasheet (1) is made of at least two stacked layers (2, 3) made of an organic polymer material. A textile (5) is arranged at least in a sub-region between the layers (2, 3) and outside of the layers (2, 3) so as to form a tab (4), and the textile (5) is at least partly coated on one or both sides and/or saturated with an organic binder (6) at least in the region between the layers (2, 3) and is bonded to the two layers (2, 3) by means of the binder (6).
摘要:
Disclosed are security articles and methods and systems for authenticating security articles using a plurality of stimuli. According to one embodiment, an illustrative security feature includes an encoded feature wherein differential activation of phosphorescent or fluorescent materials creates a machine readable code through the simultaneous presence of a source of electromagnetic radiation and a specific gas environment. A detector detects a differential spectral emission across the security feature that results from the change in gas environment. The spectral emission may be compared to an expected emissive signature to determine authenticity of the security article.
摘要:
The present invention provides a novel fluorescent molecule having formula 1 which exhibit emission color change when in contact with moisture useful for the preparation of fluorescent paper, allowing self-erasable writing, security label for document authenticity, check and prevention of currency counterfeit. Compound of formula 1 when coated on paper results in blue emitting surfaces on which writing is possible using water as ink. The images undergo self-erasal after 6 hours making the paper reusable or instantly with hot air. The images are visible only on illumination with a UV lamp having wavelength 365 nm. The material can be coated on any document to create security label which changes color on touching with a wet surface or water pen and will go back to the native color when the moisture is dried off after a time frame. This strategy is used to create a security label for currency bills for checking original and fake currency notes or any other documents for authenticity. The technique is also useful for temporary writing on recyclable papers.
摘要:
A multilayer body (1, 2, 3) and a method for producing a security element are described. The multilayer body has a metal layer (21). An optically active surface relief is molded at least in areas in a first surface of the metal layer (21) facing the upper side of the multilayer body or forming the upper side of the multilayer body and/or in a second surface of the metal layer (21) facing the underside of the multilayer body or forming the underside of the multilayer body. In at least one first area (31 to 39) of the multilayer body the surface relief is formed by a first relief structure (61). In at least one direction (617) determined by an allocated azimuth angle, the first relief structure (61) has a sequence of elevations (612) and depressions (614), the elevations (612) of which follow on from each other with a period P which is smaller than a wavelength of visible light, wherein the minima of the depressions (614) lie on a base surface and the first relief structure (61) has a relief depth t which is determined by the spacing of the maxima of the elevations (612) of the first relief structure (61) from the base surface in a direction perpendicular to the base surface. The profile shape and/or the relief depth t of the first relief structure (61) is chosen such that the colored appearance of the light (52, 53) incident on the first area (31 to 39) at least at a first angle of incidence and directly reflected by the metal layer (21) in the first area or directly transmitted through the metal layer is modified, in particular is modified by plasmon resonance of the metal layer with the incident light.
摘要:
This invention is directed to improvements in substrates, such as paper, incorporating a security device, and to documents made therefrom. The security substrate comprises at least one elongate security device, which security device has a series of first regions exposed at a series of windows formed in at least a first surface of the substrate and a series of second regions covered by the substrate at bridges formed between the windows in the first surface of the substrate. Each of the first regions is provided with a first security feature which is substantially of the same appearance in each region and is visible in each window when the first surface of the substrate is viewed ire reflected light. The second regions are provided with a second security feature which is substantially of the same appearance in each second region but is different from the first security feature and is not visible when the first surface of the substrate is viewed in reflected light, but is visible when the first surface of the substrate is viewed in transmitted light.
摘要:
A method includes producing an article having a substrate with a plurality of independent taggant layers that each include metal oxide nanocrystals doped with at least one Lanthanide element. Each taggant layer includes metal oxide nanocrystals doped with a different Lanthanide element than each other taggant layer.
摘要:
Embodiments include luminescent phosphor compounds that include one or more emitting ions and one or more disturbing ions, and methods for their production. An emitting ion in the compound may be characterized by a first decay time constant when the emitting ion is undisturbed. However, a corresponding disturbing ion in the compound, which is different from the emitting ion, causes the emitting ion to have a pre-defined, target disturbed decay time constant that is greater than zero and less than the first decay time constant. An embodiment of an authentication system is configured to measure the decay time constant of a phosphor compound applied to an article, and to determine whether the decay time constant corresponds to a phosphor compound that includes a particular disturbing ion (e.g., in order to determine whether or not the article is authentic).
摘要:
The invention relates to a security element (2) with a first area (30) that is transparent in transmitted light. The security element (2) has a substrate (21) which has, in the first area (30), one or more transmissive diffraction structures which display one or more optical security features when observed in transmitted light.