EP2239150B1 - Security device - Google Patents
Security device Download PDFInfo
- Publication number
- EP2239150B1 EP2239150B1 EP09157495.4A EP09157495A EP2239150B1 EP 2239150 B1 EP2239150 B1 EP 2239150B1 EP 09157495 A EP09157495 A EP 09157495A EP 2239150 B1 EP2239150 B1 EP 2239150B1
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- EP
- European Patent Office
- Prior art keywords
- safety device
- surface elements
- light reflection
- reflection element
- safety
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/30—Identification or security features, e.g. for preventing forgery
- B42D25/328—Diffraction gratings; Holograms
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
- B42D25/29—Securities; Bank notes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
Definitions
- the invention relates to a security device, in particular for improving the security against forgery of means of payment.
- Security devices are used, for example, for labeling branded products and in particular for means of payment such as credit cards, banknotes and the like.
- security devices are security devices visible to the human eye, such as holograms. Also not visible to the human eye or only visible under special light safety devices are known, which are generated for example by introduced into the means of payment color pigments. Accordingly, despite the variety of existing safety devices, there is a need to develop tamper-resistant security devices.
- a diffractive security element that includes a surface pattern composed by mosaic-like surface elements. At least a part of the surface elements consists of a superimposition of linear asymmetric diffraction gratings, with a spatial frequency between 50 lines / mm and 2000 lines / mm and a matt structure with a mean roughness in the range of 20 nm and 2000 nm.
- the incident light is reflected by the optically acting Distracts structures in a predetermined way and creates a highly visible, static surface pattern.
- the Superposition of the asymmetric diffraction gratings and the matt structure the light diffracted by the grating is visible in a large solid angle.
- suitable choice of the scattering power and the scattering direction can be achieved by rotation of the element by 180 °, for example, a contrast reversal by the arrangement of at least two antiparallel structured surface elements.
- the safety device has a flat light reflection element.
- This is, for example, an aluminum foil, a silver foil or another, a reflection causing metal foil.
- a light reflection element is provided, which has a highly reflective surface to the smallest possible, especially none, invoke refraction and diffraction effects.
- Three-dimensional diffractive surface elements are arranged on a surface of the light reflection element according to the invention. The surface elements diffract the light reflected at the light reflection element. The diffraction of the light takes place in the direction of a viewer, i. a human eye, or a machine inspection device.
- the individual surface elements are provided on a light exit surface with different diffraction gratings.
- a plurality of surface elements at least two different diffraction gratings are thus provided.
- the surface elements are combined to form a group, wherein the individual surface elements of the group are designed and / or arranged such that an asterism arises for the viewer or the checking device.
- the incident light reflected by the light reflection element is diffracted by the diffraction gratings of the surface elements such that an asterism is created for the viewer.
- This may be a single straight line in the simplest embodiment. According to the invention, however, the asterism has several, in particular star-shaped lines.
- the asterism can be recognized by the viewer or the checking device in a relatively large angular range.
- the angle range is preferably 90 ° ⁇ 20 ° to the surface of the light reflection element. It is preferred that the asterism is recognizable within an angular range of 90 ° ⁇ 45 ° and particularly preferably of 90 ° ⁇ 60 °.
- tilting of the safety device does not change the visual impression within the predetermined angular range.
- the bright central point at which intersect several lines of asterism does not change its location or at least only slightly.
- the individual surface elements of a surface element group are in this case designed and / or arranged such that the emission direction of the light caused by the diffraction at the exit surface forms an asterism.
- exit surfaces of the individual surface elements are provided. In this case, exit surfaces of less than 30 microns 2 and more preferably less than 25 microns 2 are preferred. Furthermore, it is preferred that the spacings of the individual surface elements are small. In this case, distances of 0-100 ⁇ m, preferably 0-50 ⁇ m, are preferred.
- the distance between the exit surface of the surface elements, in which the diffraction grating and the surface of the light reflecting element is small.
- the distance is 1 - 300 microns, preferably 1 - 200 microns.
- a suitable material for producing the surface elements or a group of several surface elements preferably has the following composition:
- the resulting layer thickness preferably has 1 to 300 ⁇ m, in particular 1 to 200 ⁇ m. It is particularly preferred to apply the lacquer for the production of the surface elements directly to the light reflection element, to form and to cure, for example, with UV radiation.
- the diffraction gratings of the individual surface elements preferably have a frequency which is less than 1 ⁇ 4 of the wavelength of the incident light.
- the frequency of the diffraction grating is less than 100 nm, in particular less than 50 nm.
- the diffraction grating itself in this case preferably has a wave-shaped profile, wherein the individual flanks of the wave-shaped profile can have an uneven flank slope.
- it may also be a uniform sinusoidal profile, a rectangular profile or a sawtooth profile as well as combinations of different profiles.
- the asterism generated according to the invention is preferably perceptible by the human eye, so that a check of the security device and thus, for example, a verification of the authenticity of a means of payment without aids is possible.
- the asterism is formed, for example, only when using specific wavelengths or wavelength ranges of the incident light and, for example, multiple light sources are required, which illuminate from different directions. These are, in particular, point light sources illuminating the safety device from different directions. The resulting asterism can then possibly be detected by an optical inspection device.
- the safety device according to the invention can be integrated into a further optical safety device.
- the safety device has a light reflection element 10, which is, for example, an aluminum foil.
- the light reflecting member 10 is disposed with a bottom 12 on a product to be secured, such as a credit card, a bill or the like.
- a plurality of diffractive surface elements 18 are arranged on a surface 14 of the light reflection element.
- the individual surface elements 18 have a light exit surface 20 with a diffraction grating.
- the individual surface elements 18, which are combined to form a group of surface elements are produced together by applying a lacquer to the surface 14 of the light reflection element 10 and producing the individual surface elements via a molding element.
- a lacquer is used, which is curable by UV radiation.
- the lacquer layer 22 preferably has a thickness d of from 1 to 300 ⁇ m after the shaping of the surface elements 18.
- Incident light rays 24 are reflected on the surface 14 of the light reflection element 10, possibly after diffraction has already taken place upon entering the lacquer layer. Upon exiting the surface elements, the light rays are transmitted through the outer surface 26 ( Fig. 2 ) of the individual surface elements 20 provided diffraction gratings bent so that they meet in a common point 28.
- a line 30 is formed (FIG. Fig. 3a ).
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- Business, Economics & Management (AREA)
- Accounting & Taxation (AREA)
- Finance (AREA)
- Diffracting Gratings Or Hologram Optical Elements (AREA)
- Credit Cards Or The Like (AREA)
Description
Die Erfindung betrifft eine Sicherheitseinrichtung, insbesondere zur Verbesserung der Fälschungssicherheit von Zahlungsmitteln.The invention relates to a security device, in particular for improving the security against forgery of means of payment.
Sicherheitseinrichtungen werden beispielsweise zur Kennzeichnung von Markenprodukten und insbesondere bei Zahlungsmitteln, wie Kreditkarten, Geldscheinen und dergleichen eingesetzt. Bei Sicherheitseinrichtungen handelt es sich beispielsweise um von dem menschlichen Auge sichtbare Sicherheitseinrichtungen, wie Hologramme. Auch sind für das menschliche Auge nicht sichtbare oder nur unter speziellem Licht sichtbare Sicherheitseinrichtungen bekannt, die beispielsweise durch in das Zahlungsmittel eingebrachte Farbpigmente erzeugt sind. Trotz der Vielzahl bestehender Sicherheitseinrichtungen besteht dementsprechend ein Bedürfnis der Entwicklung von fälschungssicheren Sicherheitseinrichtungen.Security devices are used, for example, for labeling branded products and in particular for means of payment such as credit cards, banknotes and the like. For example, security devices are security devices visible to the human eye, such as holograms. Also not visible to the human eye or only visible under special light safety devices are known, which are generated for example by introduced into the means of payment color pigments. Accordingly, despite the variety of existing safety devices, there is a need to develop tamper-resistant security devices.
In
Es ist Aufgabe der Erfindung eine weitere Sicherheitseinrichtung, bei der es sich um eine optische Sicherheitseinrichtung handelt, bereitzustellen, durch die die Fälschungssicherheit beispielsweise bei Zahlungsmitteln erhöht wird.It is an object of the invention to provide a further safety device, which is an optical safety device, by which the counterfeit security is increased, for example, in payment means.
Die Lösung der Aufgabe erfolgt erfindungsgemäß durch die Merkmale des Anspruchs 1.The object is achieved according to the invention by the features of claim 1.
Die erfindungsgemäße Sicherheitseinrichtung weist ein flächiges Lichtreflektionselement auf. Bei diesem handelt es sich beispielsweise um eine Aluminiumfolie, eine Silberfolie oder eine andere, eine Reflektion hervorrufende Metallfolie. Hierbei ist in bevorzugter Ausführungsform ein Lichtreflektionselement vorgesehen, das eine hoch reflektierende Oberfläche aufweist um möglichst geringe, insbesondere keine, Brechungs- und Beugungseffekte vorzurufen. An einer Oberfläche des Lichtreflektionselements sind erfindungsgemäß dreidimensionale diffraktive Oberflächenelemente angeordnet. Durch die Oberflächenelemente erfolgt eine Beugung des an dem Lichtreflektionselement reflektierten Lichts. Die Beugung des Lichts erfolgt hierbei in Richtung eines Betrachters, d.h. eines menschlichen Auges, oder einer maschinellen Überprüfungseinrichtung.The safety device according to the invention has a flat light reflection element. This is, for example, an aluminum foil, a silver foil or another, a reflection causing metal foil. Here, in a preferred embodiment, a light reflection element is provided, which has a highly reflective surface to the smallest possible, especially none, invoke refraction and diffraction effects. Three-dimensional diffractive surface elements are arranged on a surface of the light reflection element according to the invention. The surface elements diffract the light reflected at the light reflection element. The diffraction of the light takes place in the direction of a viewer, i. a human eye, or a machine inspection device.
Erfindungsgemäß sind die einzelnen Oberflächenelemente an einer Lichtaustrittsfläche mit unterschiedlichen Beugungsgittern versehen. Bei einer Vielzahl von Oberflächenelementen sind somit zumindest zwei unterschiedliche Beugungsgitter vorgesehen. Die Oberflächenelemente sind zu einer Gruppe zusammengefasst, wobei die einzelnen Oberflächenelemente der Gruppe derart ausgebildet und/ oder angeordnet sind, dass für den Betrachter bzw. die Überprüfungseinrichtung ein Asterismus entsteht. Dies bedeutet, dass erfindungsgemäß das einfallende und von dem Lichtreflektionselement reflektierte Licht von den Beugungsgittern der Oberflächenelemente derart gebeugt wird, dass für den Betrachter ein Asterismus entsteht. Hierbei kann es sich in einfachster Ausführungsform um eine einzige gerade Linien handeln. Erfindungsgemäß weist der Asterismus jedoch mehrere, insbesondere sternförmig angeordnete Linien auf. Die mehrere Linien schneiden sich hiermit in einem einzigen, insbesondere zentralen Punkt. Hierdurch entsteht ähnlich dem in der Mineralogie auftretenden Asterismus ein Linienstern mit einem zentralen hellen Punkt. In der Mineralogie tritt der Asterismus insbesondere bei Sternsaphiren, Sternrubinen und Sternkorunden auf. Durch den Asterismus erfolgt somit eine Lichtkonzentration in Richtung des Betrachters bzw. der Überprüfungseinrichtung.According to the invention, the individual surface elements are provided on a light exit surface with different diffraction gratings. In the case of a plurality of surface elements, at least two different diffraction gratings are thus provided. The surface elements are combined to form a group, wherein the individual surface elements of the group are designed and / or arranged such that an asterism arises for the viewer or the checking device. This means that, according to the invention, the incident light reflected by the light reflection element is diffracted by the diffraction gratings of the surface elements such that an asterism is created for the viewer. This may be a single straight line in the simplest embodiment. According to the invention, however, the asterism has several, in particular star-shaped lines. The several lines intersect herewith in a single, especially central point. As a result, similar to the asterism that occurs in mineralogy, a lineage star with a central bright point is created. In mineralogy, asterism occurs especially in star sapphires, stellar rubies, and stellar corollas. Through the asterism Thus, there is a concentration of light in the direction of the viewer or the checking device.
In bevorzugter Ausführungsform kann von dem Betrachter bzw. der Überprüfungseinrichtung der Asterismus in einem relativ großen Winkelbereich erkannt werden. Hierbei ändert sich das Erscheinungsbild nicht, solange der Betrachter bzw. die Überprüfungseinrichtung die Sicherheitseinrichtung innerhalb des Winkelbereichs betrachtet. Der Winkelbereich beträgt vorzugsweise 90° ± 20° zu der Oberfläche des Lichtreflektionselements. Bevorzugt ist es, dass der Asterismus innerhalb eines Winkelbereichs von 90° ± 45° und besonders bevorzugt von 90° ± 60° erkennbar ist. Insbesondere für das menschliche Auge erfolgt beim Verkippen der Sicherheitseinrichtung innerhalb des vorgegebenen Winkelbereichs keine Veränderung des optischen Eindrucks. Insbesondere der helle zentrale Punkt, an dem sich mehrere Linien des Asterismus schneiden, verändert seine Lage nicht oder zumindest nur unwesentlich.In a preferred embodiment, the asterism can be recognized by the viewer or the checking device in a relatively large angular range. Here, the appearance does not change as long as the viewer or the inspection device views the security device within the angular range. The angle range is preferably 90 ° ± 20 ° to the surface of the light reflection element. It is preferred that the asterism is recognizable within an angular range of 90 ° ± 45 ° and particularly preferably of 90 ° ± 60 °. In particular for the human eye, tilting of the safety device does not change the visual impression within the predetermined angular range. In particular, the bright central point at which intersect several lines of asterism, does not change its location or at least only slightly.
Die einzelnen Oberflächenelemente einer Oberflächenelementegruppe sind hierbei derart ausgebildet und/ oder angeordnet, dass die durch die Beugung an der Austrittsfläche hervorgerufene Abstrahlrichtung des Lichts einen Asterismus ausbildet.The individual surface elements of a surface element group are in this case designed and / or arranged such that the emission direction of the light caused by the diffraction at the exit surface forms an asterism.
Da die Auflösung des menschlichen Auges begrenzt ist, ist es erfindungsgemäß bevorzugt, möglichst kleine Austrittsflächen der einzelnen Oberflächenelemente vorzusehen. Hierbei sind Austrittsflächen von weniger als 30 µm2 und besonders bevorzugt weniger als 25 µm2 bevorzugt. Ferner ist es bevorzugt, dass die Abstände der einzelnen Oberflächenelemente gering sind. Hierbei sind Abstände von 0 - 100 µm, vorzugsweise 0 - 50 µm bevorzugt.Since the resolution of the human eye is limited, it is inventively preferred to provide the smallest possible exit surfaces of the individual surface elements. In this case, exit surfaces of less than 30 microns 2 and more preferably less than 25 microns 2 are preferred. Furthermore, it is preferred that the spacings of the individual surface elements are small. In this case, distances of 0-100 μm, preferably 0-50 μm, are preferred.
Ferner ist erfindungsgemäß vorzugsweise der Abstand zwischen der Austrittsfläche der Oberflächenelemente, an denen sich das Beugungsgitter befindet, und der Oberfläche des Lichtreflektionselements gering. Insbesondere beträgt der Abstand 1 - 300 µm, vorzugsweise 1 - 200 µm. Hierbei ist es besonders bevorzugt die einzelnen Oberflächenelemente insbesondere gemeinsam durch Abformen eines Lacks herzustellen. Ein geeignetes Material zur Herstellung der Oberflächenelemente bzw. einer Gruppe mehrerer Oberflächenelemente weist vorzugsweise die folgende Zusammensetzung auf:Furthermore, according to the invention, preferably the distance between the exit surface of the surface elements, in which the diffraction grating and the surface of the light reflecting element is small. In particular, the distance is 1 - 300 microns, preferably 1 - 200 microns. In this case, it is particularly preferred to produce the individual surface elements in particular jointly by molding a lacquer. A suitable material for producing the surface elements or a group of several surface elements preferably has the following composition:
11 g 1H,1H,2H,2H-Perfluoroctylacrylat wurden mit 8 g Dipropylenglykoldiacrylat, 0,1 g Irgacure® 819 und 0,2 g Irgacure© 184 der Firma Ciba Spezialitätenchemie Lampersheim GmbH vermischt. 60 µl dieser Mischung wurde auf eine 2 x 2 cm große Nickelplatte aufgebracht, auf deren Oberfläche eine Negativform eines Formkörpers mit Streuzentren ausgebildet ist. Anschließend wurde ein 1 mm dickes und 1 x 1 cm großes Plättchen aus PMMA auf Oberfläche der Mischung auf der Nickelplatte aufgebracht. Daraufhin wurde der so erhaltene Sandwich auf der Nickelplatte mit dem dazwischen befindlichen Gemisch für 2 Sekunden UV-Strahlung einer handlesüblichen UV-Quecksilberlampe ausgesetzt. Anschließend wurde das Substrat mit der damit verbundenen gehärteten Abformzusammensetzung von der Negativ-Gussform entnommen.11 g of 1H, 1H, 2H, 2H-perfluorooctyl acrylate were mixed with 8 g of dipropylene glycol, 0.1 g of Irgacure ® 819 and 0.2 g Irgacure 184 from Ciba © mixed Lampersheim Specialty Chemicals GmbH. 60 μl of this mixture was applied to a 2 × 2 cm nickel plate, on the surface of which a negative mold of a shaped body with scattering centers is formed. Subsequently, a 1 mm thick and 1 x 1 cm large plate of PMMA was applied to the surface of the mixture on the nickel plate. Then, the resulting sandwich on the nickel plate with the mixture therebetween was exposed to UV radiation of a commercial UV mercury lamp for 2 seconds. Subsequently, the substrate with the associated cured impression composition was removed from the negative mold.
Die hierbei entstehende Schichtdicke weist vorzugsweise 1 - 300 µm, insbesondere 1 - 200 µm auf. Besonders bevorzugt ist es den Lack zur Herstellung der Oberflächenelemente unmittelbar auf das Lichtreflektionselement aufzutragen, abzuformen und beispielsweise mit UV-Strahlung auszuhärten.The resulting layer thickness preferably has 1 to 300 μm, in particular 1 to 200 μm. It is particularly preferred to apply the lacquer for the production of the surface elements directly to the light reflection element, to form and to cure, for example, with UV radiation.
Zur Erzeugung des erfindungsgemäßen Asterismus weisen die Beugungsgitter der einzelnen Oberflächenelemente vorzugsweise eine Frequenz auf, die kleiner ist als ¼ der Wellenlänge des einfallenden Lichts. Vorzugsweise ist die Frequenz des Beugungsgitters kleiner als 100 nm, insbesondere kleiner als 50 nm.To produce the asterism according to the invention, the diffraction gratings of the individual surface elements preferably have a frequency which is less than ¼ of the wavelength of the incident light. Preferably, the frequency of the diffraction grating is less than 100 nm, in particular less than 50 nm.
Das Beugungsgitter selbst weist hierbei vorzugsweise ein wellenförmiges Profil auf, wobei die einzelnen Flanken des wellenförmigen Profils eine ungleichmäßige Flankensteigung aufweisen können. Ebenso kann es sich aber auch um ein gleichmäßiges Sinusprofil, ein Rechteckprofil oder ein Sägezahnprofil sowie um Kombinationen unterschiedlicher Profile handeln.The diffraction grating itself in this case preferably has a wave-shaped profile, wherein the individual flanks of the wave-shaped profile can have an uneven flank slope. However, it may also be a uniform sinusoidal profile, a rectangular profile or a sawtooth profile as well as combinations of different profiles.
Der erfindungsgemäß erzeugte Asterismus ist vorzugsweise durch das menschliche Auge wahrnehmbar, so dass eine Überprüfung der Sicherheitseinrichtung und somit beispielsweise eine Echtheitsüberprüfung eines Zahlungsmittels ohne Hilfsmittel möglich ist. Es ist jedoch auch möglich, dass der Asterismus beispielsweise nur bei Verwendung von bestimmten Wellenlängen bzw. Wellenlängenbereichen des einfallenden Lichts entsteht und beispielsweise mehrere Lichtquellen erforderlich sind, die aus unterschiedlichen Richtungen beleuchten. Hierbei handelt es sich insbesondere um aus unterschiedlichen Richtungen die Sicherheitseinrichtung beleuchtende Punktlichtquellen. Der entstehende Asterismus kann sodann ggf. durch eine optische Überprüfungseinrichtung erkannt werden.The asterism generated according to the invention is preferably perceptible by the human eye, so that a check of the security device and thus, for example, a verification of the authenticity of a means of payment without aids is possible. However, it is also possible that the asterism is formed, for example, only when using specific wavelengths or wavelength ranges of the incident light and, for example, multiple light sources are required, which illuminate from different directions. These are, in particular, point light sources illuminating the safety device from different directions. The resulting asterism can then possibly be detected by an optical inspection device.
Besonders bevorzugt ist es die erfindungsgemäße Sicherheitseinrichtung mit anderen Sicherheitseinrichtungen, die beispielsweise Hologramme oder dergleichen erzeugen, zu kombinieren. Insbesondere kann die erfindungsgemäße Sicherheitseinrichtung in eine weitere optische Sicherheitseinrichtung integriert werden.It is particularly preferable to combine the safety device according to the invention with other safety devices which produce, for example, holograms or the like. In particular, the safety device according to the invention can be integrated into a further optical safety device.
Die vorstehend beschriebene Anordnung von dreidimensionalen diffraktiven Oberflächenelementen auf einem Lichtreflektionselement ist nicht auf Sicherheitseinrichtungen beschränkt. Vielmehr ist eine derartige Ausgestaltung der Oberflächenelemente zur Erzeugung eines Asterismus auch zur Anwendung bei anderen Reflektoren geeignet.The above-described arrangement of three-dimensional diffractive surface elements on a light reflecting element is not limited to safety devices. Rather, such an embodiment of the surface elements for generating an asterism is also suitable for use in other reflectors.
Nachfolgend wird die Erfindung anhand einer bevorzugten Ausführungsform unter Bezugnahme auf die anliegenden Zeichnungen näher erläutert.The invention will be explained in more detail with reference to a preferred embodiment with reference to the accompanying drawings.
- Fig. 1Fig. 1
- eine schematische Schnittansicht einer erfindungsgemäßen Sicherheitseinrichtung,a schematic sectional view of a safety device according to the invention,
- Fig. 2Fig. 2
- eine schematische perspektivische Ansicht eines einzelnen Oberflächenelements,a schematic perspective view of a single surface element,
- Fig. 3Fig. 3
- unterschiedliche schematische Darstellungen von für den Betrachter sichtbaren Asterismen.different schematic representations of visible to the viewer asterisms.
Die erfindungsgemäße Sicherheitseinrichtung weist ein Lichtreflektionselement 10 auf, bei dem es sich beispielsweise um eine Aluminiumfolie handelt. Das Lichtreflektionselement 10 ist mit einer Unterseite 12 auf einem zu sichernden Produkt, wie einer Kreditkarte, einem Geldschein oder dergleichen angeordnet. An einer Oberfläche 14 des Lichtreflektionselements sind eine Vielzahl von diffraktiven Oberflächenelementen 18 angeordnet. Die einzelnen Oberflächenelemente 18 weisen eine Lichtaustrittsfläche 20 mit einem Beugungsgitter auf. Vorzugsweise werden die einzelnen Oberflächenelemente 18, die zu einer Gruppe an Oberflächenelementen zusammengefasst sind, gemeinsam hergestellt, indem ein Lack auf die Oberfläche 14 des Lichtreflektionselements 10 aufgetragen und über ein Abformelement die einzelnen Oberflächenelemente hergestellt werden. Hierbei wird vorzugsweise ein Lack verwendet, der durch UV-Strahlung aushärtbar ist. Hierbei weist die Lackschicht 22 nach dem Ausformen der Oberflächenelemente 18 vorzugsweise eine Dicke d von 1 - 300 µm auf.The safety device according to the invention has a
Einfallende Lichtstrahlen 24 werden, nachdem ggf. beim Eintreten in die Lackschicht bereits eine Beugung erfolgte, an der Oberfläche 14 des Lichtreflektionselements 10 reflektiert. Beim Austreten aus den Oberflächenelementen werden die Lichtstrahlen durch das an der Außenfläche 26 (
Die Beugung erfolgt derart, dass, von oben betrachtet, in einfachster Ausführungsform eine Linie 30 entsteht (
Erfindungsgemäß werden mehrere Linien 30 erzeugt werden (
Claims (11)
- A safety device, particularly for improved protection against forgery of means of payment, effected by providing a symbol, said safety device comprising:a plurality of diffractive surface elements (18) arranged on a light reflection element (10), said diffractive surface elements comprising partially different diffraction gratings,each individual surface element (18) having a three-dimensional surface structure,a plurality of said surface elements (18) forming a surface element array,characterized in thatthe diffraction gratings of an array of surface elements (18) are formed and/or arranged to generate an asterism to be perceived by the observer and the verification device, respectively, andsaid asterism comprises a plurality of lines (30) intersecting each other in a common point (28).
- The safety device according to claim 1, characterized in that, upon a change of the illumination or observation angle within an angular range of 90°± 20°, preferably 90°± 45° and more preferably 90°± 60°, each time relative to the surface (14) of the light reflection element (10), a quasi-static representation of said symbol (30) is perceived by an observer and the verification device, respectively.
- The safety device according to any one of claims 1 - 2, characterized in that the diffractive surface elements (18) comprise diffraction gratings having a wave-shaped profile, the flank slopes of said profile preferably having varying shapes.
- The safety device according to any one of claims 1 - 3, characterized in that the light reflection element (10) is formed as an areal reflector, said reflector comprising at least one light-reflecting layer, preferably a metal layer, on its top side (14) or bottom side (12), or consisting of a metal foil, preferably an aluminum or silver foil.
- The safety device according to any one of claims 1 - 4, characterized in that the distance between the light exit surface (26) of the surface elements (18) and the surface (14) of the light reflection element (10) is preferably 1 - 300 µm, more preferably 1 - 200 µm.
- The safety device according to any one of claims 1 - 5, characterized in that the surface elements (18) are applied on a light reflection element (10) by depositing a lacquer onto the surface (14) of a light reflection element (10), structuring the surface elements (18), preferably together, by means of a molding element and then curing them, wherein, after the molding the surface elements (18), the cured lacquer layer preferably has a thickness of 1 - 300 µm, preferably 1 - 200 µm.
- The safety device according to any one of claims 1 - 6, characterized in that the distance between the surface elements (18) is preferably 0 - 100 µm, more preferably 0 - 50 µm.
- The safety device according to any one of claims 1 - 7, characterized in that said light exit surface (26) has a cross-sectional area of preferably less than (30 µm)2, more preferably less than (25 µm)2.
- The safety device according to any one of claims 1 - 8, characterized in that the generated asterism is automatically detectable by a mechanical verification device.
- The safety device according to any one of claims 1 - 9, characterized in that the safety device is integrated in a further safety element and respectively is combined with a further safety feature.
- A safety document, such as e.g. a means of payment, comprising a safety device according to at least one of the preceding claims.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP09157495.4A EP2239150B1 (en) | 2009-04-07 | 2009-04-07 | Security device |
PCT/EP2010/054609 WO2010115936A1 (en) | 2009-04-07 | 2010-04-07 | Security device |
US13/263,200 US20120147470A1 (en) | 2009-04-07 | 2010-04-07 | Security device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP09157495.4A EP2239150B1 (en) | 2009-04-07 | 2009-04-07 | Security device |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2239150A1 EP2239150A1 (en) | 2010-10-13 |
EP2239150B1 true EP2239150B1 (en) | 2013-10-23 |
Family
ID=41057305
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09157495.4A Not-in-force EP2239150B1 (en) | 2009-04-07 | 2009-04-07 | Security device |
Country Status (3)
Country | Link |
---|---|
US (1) | US20120147470A1 (en) |
EP (1) | EP2239150B1 (en) |
WO (1) | WO2010115936A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104968503B (en) * | 2012-12-04 | 2018-08-14 | 赛克达戈有限公司 | Safety device |
US9731538B2 (en) | 2013-02-12 | 2017-08-15 | Sectago Gmbh | Security device |
US10207531B2 (en) | 2013-12-02 | 2019-02-19 | SECTAG GmbH | Security device |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10146508C2 (en) * | 2001-09-21 | 2003-07-24 | Ovd Kinegram Ag Zug | Label with a diffractive bar code and reading arrangement for such labels |
DE10157534C1 (en) * | 2001-11-23 | 2003-05-15 | Ovd Kinegram Ag Zug | Security element with diffractive structure has surface pattern with pair(s) of surfaces with first and second elements with diffraction structure formed by superimposing grid, relief structures |
US6924934B2 (en) * | 2001-12-22 | 2005-08-02 | Ovd Kinegram Ag | Diffractive safety element |
CN100519222C (en) * | 2002-01-18 | 2009-07-29 | Ovd基尼格拉姆股份公司 | Diffractive security element having an integrated optical waveguide |
DE10312708B4 (en) * | 2003-03-21 | 2007-06-28 | Ovd Kinegram Ag | retroreflector |
GB0401060D0 (en) * | 2004-01-19 | 2004-02-18 | Ezra David | Optical devices |
ES2443046T5 (en) * | 2005-07-20 | 2018-06-12 | Viavi Solutions Inc. | A two-stage method for coating an article for secure printing |
DE102006050047A1 (en) * | 2006-10-24 | 2008-04-30 | Giesecke & Devrient Gmbh | Transparent security element for security papers, data carrier, particularly valuable documents such as bank note, identification card and for falsification of goods, has transparent substrate and marking layer applied on substrate |
DE102007039996B4 (en) * | 2007-02-07 | 2020-09-24 | Leonhard Kurz Stiftung & Co. Kg | Security element for a security document and method for its production |
-
2009
- 2009-04-07 EP EP09157495.4A patent/EP2239150B1/en not_active Not-in-force
-
2010
- 2010-04-07 US US13/263,200 patent/US20120147470A1/en not_active Abandoned
- 2010-04-07 WO PCT/EP2010/054609 patent/WO2010115936A1/en active Application Filing
Also Published As
Publication number | Publication date |
---|---|
US20120147470A1 (en) | 2012-06-14 |
EP2239150A1 (en) | 2010-10-13 |
WO2010115936A1 (en) | 2010-10-14 |
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