DE102005001443A1 - Valuable document e.g. credit card, safety marking testing method, involves producing diffraction structure with multi-photon absorption under application of ultra short pulses of femto-second laser inside transparent polymer - Google Patents
Valuable document e.g. credit card, safety marking testing method, involves producing diffraction structure with multi-photon absorption under application of ultra short pulses of femto-second laser inside transparent polymer Download PDFInfo
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- DE102005001443A1 DE102005001443A1 DE200510001443 DE102005001443A DE102005001443A1 DE 102005001443 A1 DE102005001443 A1 DE 102005001443A1 DE 200510001443 DE200510001443 DE 200510001443 DE 102005001443 A DE102005001443 A DE 102005001443A DE 102005001443 A1 DE102005001443 A1 DE 102005001443A1
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- diffraction structure
- laser
- polymer
- diffraction
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/08—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code using markings of different kinds or more than one marking of the same kind in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means
- G06K19/10—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code using markings of different kinds or more than one marking of the same kind in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means at least one kind of marking being used for authentication, e.g. of credit or identity cards
- G06K19/16—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code using markings of different kinds or more than one marking of the same kind in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means at least one kind of marking being used for authentication, e.g. of credit or identity cards the marking being a hologram or diffraction grating
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Prüfung einer Sicherheitsmarkierung, welche zu Sicherheitszwecken mit einem Gegenstand verbunden ist.The Invention relates to a method for testing a security marking, which is connected to an object for security purposes.
Verschiedene Güter des täglichen Lebens sind mit Sicherheitselementen ausgestattet, welche charakteristische Sicherheitsmarkierungen enthalten und damit zur Unterscheidung der Güter von nachgeahmten oder veränderten Gütern dienen. Dazu zählen beispielsweise alle Arten von Wertdokumenten, wie Banknoten, Schecks, Ausweiskarten, Kreditkarten, Fahrkarten und Einrittsskarten, um nur einige zu nennen, Sicherheitsbedarf besteht auch im Zusammenhang mit hochwertigen Produkten, wie Cds, Büchern und dergleichen, die entweder selbst oder auf ihren Verpackungen Sicherheitsetiketten, – aufdrucke oder – anhänger tragen.Various Goods of daily Life is equipped with security elements, which are characteristic Contain safety markings and thus to distinguish the Goods from imitated or altered goods serve. These include for example, all types of value documents, such as banknotes, checks, Identity cards, credit cards, train tickets and entry cards to just to name a few, security needs are also related with quality products, such as cds, books and the like, the either on its own or on its packaging. Safety labels, imprints or trailer.
Zur Sicherung und Identifikation sind bereits verschiedene Maßnahmen vorgeschlagen worden.to Security and identification are already different measures been proposed.
Es ist z.B. allgemein bekannt eine Sicherheitsmarkierung mit Hologrammen auszustatten, die in Reflektion oder Transmission unter z.B. Weißlicht das gespeicherte Bild wiedergeben. Das Überprüfen des Bildes mit einem Referenzbild kann hierbei als Echtheitskriterium gelten.It is e.g. commonly known a security marker with holograms in reflection or transmission below e.g. White light that play saved picture. Checking the image with a reference image can be used as authenticity criterion.
So wird in der deutschen Patentschrift 19809503 A1 die Herstellung eines individuellen Hologramms beschrieben, das zum Sichern von Dokumenten verwendet wird. Das dort beschriebene Aufnahmeverfahren für die Herstellung eines individuellen Hologramms erfordert komplizierte Beleuchtungsschritte und ist sehr aufwendig. Das hergestellte Hologramm wird über das Kontaktverfahren hergestellt und ist somit nicht kratzfest.So German patent specification 19809503 A1 describes the production of an individual hologram used to back up Documents is used. The recording method described there for the Making an individual hologram requires complicated Lighting steps and is very expensive. The hologram made will over made the contact method and is therefore not scratch resistant.
Ein anderes Verfahren zum Abspeichern von holographischer Information, wird in der deutschen Patentanmeldung 10039370 A1 beschrieben. Hierbei wird holographische Information direkt über einen Laserlithographen mit cw-Lasern in einen mit einer Absorberschicht beschichtete Polymerfolie geschrieben. Die Beugungsstruktur befindet sich hierbei an der Oberfläche des Polymerfilms, da die Brechzahländerung über die Erwärmung der Oberfläche des Polymers erfolgt. Der Nachteil dieser Methode ist, daß die Beugungssstruktur an der Oberfläche des Polymers und somit nicht kratzfest ist. Darüber hinaus liegt die Beugungssstruktur im Mikrometerbereich. Wünschenswerter wäre es die Beugungsstruktur im Inneren eines Polymers und im Subμm-Bereich zu erzeugen und hierbei auf den Absorber verzichten zu können.One another method of storing holographic information, is described in the German patent application 10039370 A1. This is holographic information directly via a laser lithograph with cw lasers in a polymer film coated with an absorber layer written. The diffraction structure is located on the surface of the Polymer film, as the refractive index change over the warming the surface of the polymer takes place. The disadvantage of this method is that the diffraction structure on the surface of the polymer and thus is not scratch resistant. In addition, the diffraction structure lies in the micrometer range. Desirable would it be the diffraction structure inside a polymer and in the submicron range generate and thereby be able to do without the absorber.
Gelöst wird die Erzeugung einer visuell nicht sichtbaren Beugungsstruktur im Inneren eines Polymers durch die Verwendung der Multi-Photonenabsorption mit Femtosekunden-Lasersystemen im Nahen-Infaroten oder sichtbaren Spektralbereich.Is solved the generation of a visually invisible diffraction structure in the Interior of a polymer through the use of multi-photon absorption with femtosecond laser systems in near infrared or visible spectral range.
Der zu schützende Gegenstand enthält diese Sicherheitsmarkierung zur Überprüfung der Echtheit des Produkts. Die im Inneren des Polymers vorhandene Beugungsstruktur wird hierbei durch einen leistungsschwachen Laser ausgelesen.Of the to be protected Contains subject this security mark for checking the Authenticity of the product. The diffraction structure present inside the polymer is read out by a low-power laser.
Gemäß des Patentanspruches wird zur Erzeugung der Beugungsstruktur die Multi-Photonenabsorption des Materials verwendet. Da das verwendete Material wie z.B.According to the claim For example, the multi-photon absorption is used to produce the diffraction structure of the material used. Since the material used, such as
Polycarbonat (PC), Polyvinylchlorid (PVC) oder Polyester (PET) transparent ist für Strahlung von nahen infraroten und sichtbaren Laserlicht, ist es möglich den Fokus der Anregung der Multi-photonen-Absorption im Inneren des Materials zu erzeugen. Durch diese Multi-Photonen-Absorption wird das Polymer lokal verdichtet und Brechzahländerungen von 10–3 werden im Inneren des Materials induziert. Zusätzlich können auch Multiphotonen-Ablationen erzeugt werden. Die zur Anregung von zwei und mehr Photonen notwendigen Photonenflußdichten größer als 1024 Photonen cm–2 s–1 wird durch die beugungsbegrenzte Fokussierung eines Femtosekunden-Laserstrahls im nahen Infraroten bzw. sichtbaren Spektralbereich mit Objektiven der numerischen Apertur größer als oder gleich eins erreicht.Polycarbonate (PC), polyvinyl chloride (PVC) or polyester (PET) is transparent to radiation of near infrared and visible laser light, it is possible to create the focus of excitation of multi-photon absorption inside the material. This multi-photon absorption locally compacts the polymer and induces refractive index changes of 10 -3 inside the material. In addition, multiphoton ablations can also be generated. The photon flux densities greater than 10 24 photons cm -2 s -1 necessary to excite two or more photons is achieved by the diffraction-limited focusing of a femtosecond laser beam in the near infrared or visible spectral range with numerical aperture objectives greater than or equal to unity.
Das Volumen für die Anregung der Photonen liegt hierbei im Femtoliterbereich und erlaubt somit das Schreiben von Brechzahländerungen im Subμm-Bereich. Über die xy-Auslenkung des Probenhalters mit dem zu beschreibenen Polymer ist die Erzeugung einer Beugungsstruktur im Inneren des Polymers möglich. Dieser Schreibvorgang dauert nur wenige Sekunden.The Volume for the excitation of the photons lies in the femtoliter range and thus allows the writing of refractive index changes in the submicron range. About the xy deflection of the sample holder with the polymer to be described is the generation of a diffraction structure inside the polymer possible. This writing takes only a few seconds.
Die Erfindung soll im Folgenden anhand von Beispielen näher erläutert werden.The Invention will be explained in more detail below with reference to examples.
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In
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so erzeugte Beugungsstruktur kann, wie in
Claims (14)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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DE200510001443 DE102005001443A1 (en) | 2005-01-10 | 2005-01-10 | Valuable document e.g. credit card, safety marking testing method, involves producing diffraction structure with multi-photon absorption under application of ultra short pulses of femto-second laser inside transparent polymer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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DE200510001443 DE102005001443A1 (en) | 2005-01-10 | 2005-01-10 | Valuable document e.g. credit card, safety marking testing method, involves producing diffraction structure with multi-photon absorption under application of ultra short pulses of femto-second laser inside transparent polymer |
Publications (1)
Publication Number | Publication Date |
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DE102005001443A1 true DE102005001443A1 (en) | 2006-07-20 |
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Family Applications (1)
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DE200510001443 Withdrawn DE102005001443A1 (en) | 2005-01-10 | 2005-01-10 | Valuable document e.g. credit card, safety marking testing method, involves producing diffraction structure with multi-photon absorption under application of ultra short pulses of femto-second laser inside transparent polymer |
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DE (1) | DE102005001443A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010010070A1 (en) | 2010-02-26 | 2011-09-01 | Bundesdruckerei Gmbh | A marking device and method for marking value or security documents with high resolution |
WO2015128489A1 (en) * | 2014-02-28 | 2015-09-03 | Advanced Track & Trace | Method and device for forming objects having variable optical properties and object thus obtained |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE69123355T2 (en) * | 1990-09-10 | 1997-05-15 | De La Rue Holographics Ltd | SECURITY DEVICE |
WO2002011063A2 (en) * | 2000-07-27 | 2002-02-07 | Orga Kartensysteme Gmbh | Optically active structure for personalizing cards and the like, and method for the production thereof |
DE10141664A1 (en) * | 2001-08-24 | 2003-03-06 | Laser & Med Tech Gmbh | Marking of components or containers with security markings, to prevent counterfeiting, with pulsed laser light in such a way that the markings can only be viewed with a viewing apparatus |
DE10162111A1 (en) * | 2001-12-10 | 2003-06-18 | Laser & Med Tech Gmbh | Marking of components by use of a pulsed high-energy laser beam to change the complex refractive index in a surface layer of the component, so that its reflective or absorptive properties are changed and appear as a marking |
-
2005
- 2005-01-10 DE DE200510001443 patent/DE102005001443A1/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE69123355T2 (en) * | 1990-09-10 | 1997-05-15 | De La Rue Holographics Ltd | SECURITY DEVICE |
WO2002011063A2 (en) * | 2000-07-27 | 2002-02-07 | Orga Kartensysteme Gmbh | Optically active structure for personalizing cards and the like, and method for the production thereof |
DE10141664A1 (en) * | 2001-08-24 | 2003-03-06 | Laser & Med Tech Gmbh | Marking of components or containers with security markings, to prevent counterfeiting, with pulsed laser light in such a way that the markings can only be viewed with a viewing apparatus |
DE10162111A1 (en) * | 2001-12-10 | 2003-06-18 | Laser & Med Tech Gmbh | Marking of components by use of a pulsed high-energy laser beam to change the complex refractive index in a surface layer of the component, so that its reflective or absorptive properties are changed and appear as a marking |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010010070A1 (en) | 2010-02-26 | 2011-09-01 | Bundesdruckerei Gmbh | A marking device and method for marking value or security documents with high resolution |
WO2011104330A1 (en) | 2010-02-26 | 2011-09-01 | Bundesdruckerei Gmbh | Marking device and method for marking valuable or security documents with high resolution |
CN102858552A (en) * | 2010-02-26 | 2013-01-02 | 联邦印刷有限公司 | Marking device and method for marking valuable or security documents with high resolution |
CN102858552B (en) * | 2010-02-26 | 2016-01-20 | 联邦印刷有限公司 | For with high-resolution to the labelling apparatus having valency-or secure file to mark and method |
WO2015128489A1 (en) * | 2014-02-28 | 2015-09-03 | Advanced Track & Trace | Method and device for forming objects having variable optical properties and object thus obtained |
FR3018126A1 (en) * | 2014-02-28 | 2015-09-04 | Advanced Track & Trace | METHOD AND DEVICE FOR FORMING OBJECTS WITH VARIABLE OPTICAL CHARACTERISTICS AND OBJECT THUS OBTAINED |
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