EP2398653B1 - Security element for marking and/or identifying objects - Google Patents

Security element for marking and/or identifying objects Download PDF

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Publication number
EP2398653B1
EP2398653B1 EP10704767.2A EP10704767A EP2398653B1 EP 2398653 B1 EP2398653 B1 EP 2398653B1 EP 10704767 A EP10704767 A EP 10704767A EP 2398653 B1 EP2398653 B1 EP 2398653B1
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EP
European Patent Office
Prior art keywords
isomers
security element
security
element according
toluic acid
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EP10704767.2A
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German (de)
French (fr)
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EP2398653A1 (en
Inventor
Herbert Venghaus
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Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
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Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
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Classifications

    • 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
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/14—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using chemical means
    • 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
    • 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
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/378—Special inks
    • B42D25/387—Special inks absorbing or reflecting ultraviolet light
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
    • G09F3/02—Forms or constructions
    • G09F3/0297—Forms or constructions including a machine-readable marking, e.g. a bar code
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
    • G09F3/02—Forms or constructions
    • G09F3/03—Forms or constructions of security seals
    • G09F3/0305—Forms or constructions of security seals characterised by the type of seal used
    • G09F3/0341—Forms or constructions of security seals characterised by the type of seal used having label sealing means
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
    • G09F3/08—Fastening or securing by means not forming part of the material of the label itself
    • G09F3/10—Fastening or securing by means not forming part of the material of the label itself by an adhesive layer
    • B42D2035/16—
    • B42D2035/34—
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
    • G09F3/02—Forms or constructions
    • G09F2003/0276—Safety features, e.g. colour, prominent part, logo
    • G09F2003/0277—Tamper resistant

Definitions

  • the invention relates to a security element for the identification and / or identification of objects, according to the preamble of the main claim.
  • a value and / or security document in which at least two different luminescent substances emitting at different emission wavelengths are arranged at different locations on the surface of the document and form a luminescent substance pattern, each emission wavelength being associated with a character and each location of a character position by selecting the various luminescent dyes in conjunction with their location a machine readable string is formed.
  • the WO 2004/033228 A1 relates to a mark of authenticity for a product in which a letter or digit string or a bar code or the like is generated from a cloth which changes its visual appearance when external parameters such as temperature, light irradiation or the like are changed.
  • the appearance change may occur as a color change, change or occurrence of luminescence, fluorescence and the like. Also, the appearance may change when the viewing angle is changed.
  • the features mentioned can be combined with structures whose essential properties lie in the non-visible spectral range and which can only be analyzed with appropriate detectors.
  • the invention is therefore an object of the invention to provide a security element for the identification and / or identification of objects that as difficult to imitate and can only be detected with difficult to access technology.
  • the security element according to the invention contains at least two isomers of a substance whose spectral properties differ and can be detected in the THz frequency range
  • the security element i. the isomers are detected in the form of a structure using THz radiation, whereas they are indistinguishable under UV, visible or near infrared radiation.
  • isomers of different substances or types of molecules can be used, wherein the transition from one substance or molecular species to another, which can be used to make the structure of the security element at another THz frequency visible without permanent and costly monitoring of Counterfeiters can not be noticed. If such a transition is nevertheless noticed, it is again associated with great technical effort for imitation, i.
  • the hurdle for counterfeiting is high and every change provides a new time advantage.
  • the isomers for forming the structure are arranged two- or three-dimensionally on a support, for example, a bar code or other pattern code, but also letters or numbers can be provided. It can thus By choosing the number of isomers and arranging them to each other any desired information is generated.
  • the carrier can be part of the security element, for example as a label, which is applied to the object to be marked.
  • the carrier may also be the object itself or part of it.
  • the isomers are selected from structural isomers, e.g. Positional isomers, or stereoisomers such as enantiomers or diastereomers.
  • structural isomers by way of example, o-, m- or p-toluic acid may be considered as isomers of the substance benzoic acid.
  • the isomers are incorporated or embedded in a suitable host material or matrix so that they can be applied to the desired support and are protected against environmental influences (moisture, mechanical stress and the like).
  • the invention relates to an article which is provided with the security element according to the invention, wherein the article may be a security or value document or a product such as a drug, a semiconductor device or the like.
  • the sole figure shows schematically a security and / or value document with the security element according to the invention, which are banknotes, identity cards, other documents, data cards, tickets, self-adhesive labels, packaging bands, e.g. in medicines or the like, can act.
  • the invention is based on the recognition that numerous organic substances or their molecules have multiple isomeric compounds, ie chemical compounds of the same empirical formula, but different chemical structure and sometimes with different physical and biological properties.
  • the isomers are composed of the same functional groups, the functional groups being geometrically differently arranged.
  • the isomers of a molecule according to the invention have the same spectral properties in the UV, visible and NIR ranges, for example with respect to absorption and reflection. Vibrations of the individual functional groups to one another lead to characteristic absorption or reflection spectra in the THz range and these oscillation frequencies are different for the different isomers, ie different isomers have different spectra, eg absorption spectra in the THz range. This property is used in the invention.
  • the security and / or valuable document 1 shown in the figure has a carrier 2, which consists for example of paper, cardboard, plastic, textiles or mixed forms of these, in the form of films, fabric layers of any kind or the like.
  • a security element 3 is applied, which in the present case, the structure of a bar code, ie in the form of adjacent bars is formed, wherein two adjacent bars each have a different absorption spectrum, in the THz range in each case at least one expression eg has a maximum.
  • the respective bars of the barcode structure of the security element 3 contain a first isomer 4 and a second isomer 5 of the same organic molecule.
  • the number of isomers used is not limited to two, it can be selected according to the desired pattern. It is also possible to use several isomers of different molecules. In this case, the isomers are introduced or embedded in a matrix or more as host materials, which are applied to the support, for example, printed on and protect the isomers against undesired influences, while allowing the recognizability of the isomers.
  • One possible embodiment of the isomers used for the security element are, for example, the isomers of benzoic acid, namely o-, m- and p-toluic acid, in which a CH 3 group is attached to the base molecule of the benzoic acid at different positions of the carbon ring.
  • the absorption spectrum with detectable maxima is eg between 0.6 and 1.1 THz.
  • a device for generating and coherently detecting terahertz radiation For reading out or checking the barcode of the security element 3, a device for generating and coherently detecting terahertz radiation is used.
  • a device usually has a pulsed laser beam source, which activates a transmitting antenna for generating a terahertz radiation in the sensitive region of the isomers used via a photosensitive element, for example a photodiode.
  • a reception antenna which is also provided with a light-sensitive element and can be activated by the laser radiation via delay elements, receives the transmitted terahertz radiation transmitted through the security element 3 in the transmission or absorption process, the measured variable obtained being evaluated, for example, to display an absorption curve can be.
  • To generate a continuous terahertz radiation in a frequency range it is also possible to use two laser sources which are detuned with respect to one another.
  • the detection of the security element can be carried out with the device described above also in the reflection method.
  • other or additional techniques may be used which result in enhancement of THz contrast, e.g., heterodyne techniques or other techniques of frequency enhancement may be provided.
  • a plurality of isomeric compounds is suitable for the invention.
  • Particularly suitable isomers from the large amount of organic molecules are to be selected those which have the greatest possible contrast, that is to say the largest possible extent in the THz range at frequencies for which the currently existing THz scanners are provided.
  • the isomers must be long-term stable and a suitable host material for the isomers must be available.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Finance (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Credit Cards Or The Like (AREA)

Description

Die Erfindung betrifft ein Sicherheitselement zur Kennzeichnung und/oder Identifikation von Gegenständen, nach dem Oberbegriff des Hauptanspruchs.The invention relates to a security element for the identification and / or identification of objects, according to the preamble of the main claim.

Zur Kennzeichnung oder Identifikation von Gegenständen ist eine Vielzahl von Vorkehrungen bekannt, beispielsweise werden Bar- oder Mustercodes oder andere Strukturen auf Etiketten oder Verpackungen, Banknoten oder dgl. aufgebracht. Der Schutz gegen Fälschungen von Banknoten, Dokumenten, Verpackungen usw. ist auf den verschiedensten Gebieten von großer Bedeutung. Mit der Wichtigkeit des zu schützenden Objekts steigt auch der Aufwand, um Fälschungen vorzubeugen und in der Regel steigen auch die Bemühungen von Fälschern mit dem erwarteten Nutzen, die Sicherheitsmaßnahmen zu unterlaufen.For the identification or identification of objects, a variety of provisions are known, for example, bar or pattern codes or other structures on labels or packaging, banknotes or the like. Applied. The protection against counterfeiting of banknotes, documents, packaging, etc. is very important in various fields. With the importance of the object to be protected, the effort to prevent counterfeiting also increases and, as a rule, the efforts of counterfeiters with the expected benefit of undermining security measures also increase.

Bekannte Schutzvorkehrungen sind z.B. Wasserzeichen, Hologramme, in Banknoten eingebettete Metallfäden, nur unter UV-Bestrahlung sichtbare Strukturen, zweidimensionale Bitmuster, z.B. auf Fahrkarten, um nur Einige zu nennen.Known precautions are e.g. Watermarks, holograms, metal threads embedded in banknotes, structures visible only under UV irradiation, two-dimensional bit patterns, e.g. on tickets, just to name a few.

Aus der DE 10 2006 017 764 A1 ist z.B. ein Wert- und/oder Sicherheitsdokument bekannt, bei dem zumindest zwei unterschiedliche und mit verschiedenen Emissionswellenlängen emittierenden Lumineszenzstoffe an verschiedenen Orten der Oberfläche des Dokuments angeordnet sind und ein Lumineszenzstoffmuster bilden, wobei jede Emissionswellenlänge einem Zeichen und jeder Ort einer Zeichenposition zugeordnet ist, wodurch durch die Auswahl der verschiedenen Lumineszenzfarbstoffe in Verbindung mit deren Ort eine maschinenlesbare Zeichenfolge gebildet wird.From the DE 10 2006 017 764 A1 For example, a value and / or security document is known in which at least two different luminescent substances emitting at different emission wavelengths are arranged at different locations on the surface of the document and form a luminescent substance pattern, each emission wavelength being associated with a character and each location of a character position by selecting the various luminescent dyes in conjunction with their location a machine readable string is formed.

Die WO 2004/033228 A1 betrifft eine Echtheitsmarke für ein Produkt, bei der eine Buchstaben- oder Ziffernfolge oder ein Barcode oder dergleichen aus einem Stoff erzeugt wird, der seine sichtbare Erscheinung ändert, wenn äußere Parameter, wie Temperatur, Lichteinstrahlung oder dergleichen geändert werden. Die Erscheinungsänderung kann als Farbänderung, Änderung oder Auftreten von Lumineszenz, Fluoreszenz und dergleichen auftreten. Auch kann das Erscheinungsbild sich ändern, wenn der Betrachtungswinkel geändert wird. Die genannten Merkmale können mit Strukturen kombiniert werden, deren wesentliche Eigenschaften im nicht sichtbaren Spektralbereich liegen und die nur mit entsprechenden Detektoren analysiert werden können.The WO 2004/033228 A1 relates to a mark of authenticity for a product in which a letter or digit string or a bar code or the like is generated from a cloth which changes its visual appearance when external parameters such as temperature, light irradiation or the like are changed. The appearance change may occur as a color change, change or occurrence of luminescence, fluorescence and the like. Also, the appearance may change when the viewing angle is changed. The features mentioned can be combined with structures whose essential properties lie in the non-visible spectral range and which can only be analyzed with appropriate detectors.

Da Fälscher permanent daran arbeiten, vorhandene Sicherheitsmaßnahmen zu überwinden, ist es notwendig, Schutzmaßnahmen ständig weiterzuentwickeln oder auch neue Konzepte zu entwickeln und in die Praxis umzusetzen. Wünschenswert ist dabei nicht nur ein zeitlicher Vorsprung vor eventuellen Fälschern, sondern auch der Einsatz von Sicherheitsmerkmalen, die möglichst schwer herzustellen, nachzumachen und zu überlisten sind, wobei eine Möglichkeit der Einsatz schwer zugänglicher Technologien ist.Since counterfeiters are constantly working to overcome existing security measures, it is necessary to constantly develop protective measures or to develop new concepts and put them into practice. Desirable is not only a time advantage over possible counterfeiters, but also the use of security features that are as difficult to produce, imitate and outwit, with a possibility of using hard to reach technologies.

Der Erfindung liegt daher die Aufgabe zugrunde, ein Sicherheitselement zur Kennzeichnung und/oder Identifikation von Gegenständen zu schaffen, das möglichst schwer nachzumachen und nur mit schwer zugänglicher Technologie zu detektieren ist.The invention is therefore an object of the invention to provide a security element for the identification and / or identification of objects that as difficult to imitate and can only be detected with difficult to access technology.

Diese Aufgabe wird erfindungsgemäß durch die kennzeichnenden Merkmale des Hauptanspruchs in Verbindung mit den Merkmalen des Oberbegriffs gelöst.This object is achieved by the characterizing Features of the main claim in conjunction with the features of the preamble solved.

Durch die in den Unteransprüchen angegebenen Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen möglich.The measures specified in the dependent claims advantageous refinements and improvements are possible.

Dadurch, dass das erfindungsgemäß Sicherheitselement mindestens zwei Isomere einer Substanz enthält, deren spektrale Eigenschaften sich im THz-Frequenzbereich unterscheiden und detektierbar sind, kann.das Sicherheitselement, d.h. die Isomere in Form einer Struktur unter Verwendung von Strahlung im THz-Bereich erkannt werden, während sie unter UV-Beleuchtung, im sichtbaren oder im nahen Infrarotbereich dagegen nicht zu unterscheiden sind. Für Fälscher ohne leistungsfähige Ressourcen in der chemischen Verfahrenstechnik ist es sehr schwer, das bzw. die Sicherheitselement(e) unbefugt nachzumachen. Dabei können Isomere unterschiedlicher Substanzen bzw. Molekülarten verwendet werden, wobei der Übergang von einer Substanz bzw. Molekülart zu einer anderen, der dazu genutzt werden kann, die Struktur des Sicherheitselement bei einer anderen THz-Frequenz sichtbar zu machen, ohne permanentes und aufwendiges Monitoring von Fälschern nicht zu bemerken ist. Falls ein solcher Übergang doch bemerkt wird, ist er für das Nachmachen wieder mit hohem technischem Aufwand verbunden, d.h. die Hürde für Fälschungen ist hoch und jeder Wechsel verschafft einen neuen zeitlichen Vorsprung.Because the security element according to the invention contains at least two isomers of a substance whose spectral properties differ and can be detected in the THz frequency range, the security element, i. the isomers are detected in the form of a structure using THz radiation, whereas they are indistinguishable under UV, visible or near infrared radiation. For counterfeiters without powerful resources in chemical engineering, it is very difficult to imitate the security element (s) without authorization. In this case, isomers of different substances or types of molecules can be used, wherein the transition from one substance or molecular species to another, which can be used to make the structure of the security element at another THz frequency visible without permanent and costly monitoring of Counterfeiters can not be noticed. If such a transition is nevertheless noticed, it is again associated with great technical effort for imitation, i. The hurdle for counterfeiting is high and every change provides a new time advantage.

Die Isomere zur Bildung der Struktur sind zwei- oder dreidimensional zueinander auf einem Träger angeordnet, beispielsweise kann ein Bar-Code oder ein sonstiger Muster-Code, aber auch Buchstaben oder Zahlen vorgesehen werden. Es kann somit durch Wahl der Anzahl von Isomeren und durch Anordnung derselben zueinander jede gewünschte Information generiert werden. Der Träger kann dabei Bestandteil des Sicherheitselementes sein, z.B. als Etikett, das auf den zu kennzeichnenden Gegenstand aufgebracht wird. Der Träger kann aber auch der Gegenstand selber oder Teil desselben sein.The isomers for forming the structure are arranged two- or three-dimensionally on a support, for example, a bar code or other pattern code, but also letters or numbers can be provided. It can thus By choosing the number of isomers and arranging them to each other any desired information is generated. The carrier can be part of the security element, for example as a label, which is applied to the object to be marked. The carrier may also be the object itself or part of it.

Bevorzugt werden die Isomere ausgewählt aus Strukturisomeren, z.B. Stellungsisomere, oder Stereoisomeren wie Enantiomere oder Diastereomere. Als Strukturisomere können beispielhaft o-, m- oder p-Toluylsäure als Isomere der Substanz Benzoesäure in Frage kommen.Preferably, the isomers are selected from structural isomers, e.g. Positional isomers, or stereoisomers such as enantiomers or diastereomers. As structural isomers, by way of example, o-, m- or p-toluic acid may be considered as isomers of the substance benzoic acid.

Die Isomere sind in ein geeignetes Host-Material bzw. Matrix eingebracht oder eingebettet, damit diese auf den gewünschten Träger aufgebracht werden können und vor Umwelteinflüssen (Feuchte, mechanische Beanspruchung und dergleichen) geschützt sind.The isomers are incorporated or embedded in a suitable host material or matrix so that they can be applied to the desired support and are protected against environmental influences (moisture, mechanical stress and the like).

Entsprechend einem bevorzugten Ausführungsbeispiel betrifft die Erfindung einen Gegenstand der mit dem erfindungsgemäßen Sicherheitselement versehen ist, wobei der Gegenstand ein Sicherheits- oder Wertdokument oder ein Produkt, wie ein Medikament, ein Halbleiterbauelement oder dergleichen sein kann.According to a preferred embodiment, the invention relates to an article which is provided with the security element according to the invention, wherein the article may be a security or value document or a product such as a drug, a semiconductor device or the like.

Die einzige Figur zeigt schematisch ein Sicherheitsund/oder Wertdokument mit dem erfindungsgemäßen Sicherheitselement, wobei es sich um Banknoten, Ausweise, sonstige Dokumenten, Datenkarten, Tickets, Haftetiketten, Verpackungsbanderolen, z.B. bei Medikamenten oder dergleichen, handeln kann.The sole figure shows schematically a security and / or value document with the security element according to the invention, which are banknotes, identity cards, other documents, data cards, tickets, self-adhesive labels, packaging bands, e.g. in medicines or the like, can act.

Die Erfindung geht aus von der Erkenntnis, dass zahlreiche organische Substanzen bzw. deren Moleküle mehrere isomere Verbindungen besitzen, d.h. chemische Verbindungen der gleichen Summenformel, jedoch unterschiedlicher chemischer Struktur und teilweise auch mit unterschiedlichen, physikalischen und biologischen Eigenschaften. Dabei sind die Isomere aus den gleichen funktionellen Gruppen aufgebaut, wobei die funktionellen Gruppen geometrisch unterschiedlich angeordnet sind Die erfindungsgemäßen Isomere eines Moleküls besitzen im UV-, im sichtbaren und im NIR-Bereich die gleichen spektralen Eigenschaften, beispielsweise bezüglich der Absorption und der Reflexion. Schwingungen der einzelnen funktionalen Gruppen zueinander führen zu charakteristischen Absorptionsoder Reflexionsspektren im THz-Bereich und diese Schwingungsfrequenzen sind bei den verschiedenen Isomeren unterschiedlich, d.h. verschiedene Isomere haben unterschiedliche Spektren, z.B. Absorptionsspektren im THz-Bereich. Diese Eigenschaft wird bei der Erfindung verwendet.The invention is based on the recognition that numerous organic substances or their molecules have multiple isomeric compounds, ie chemical compounds of the same empirical formula, but different chemical structure and sometimes with different physical and biological properties. The isomers are composed of the same functional groups, the functional groups being geometrically differently arranged. The isomers of a molecule according to the invention have the same spectral properties in the UV, visible and NIR ranges, for example with respect to absorption and reflection. Vibrations of the individual functional groups to one another lead to characteristic absorption or reflection spectra in the THz range and these oscillation frequencies are different for the different isomers, ie different isomers have different spectra, eg absorption spectra in the THz range. This property is used in the invention.

Das in der Figur dargestellte Sicherheits- und/oder Wertdokument 1 weist einen Träger 2 auf, der beispielsweise aus Papier, Pappe, Kunststoff, Textilien oder Mischformen aus diesen, in Form von Folien, Gewebeschichten jeglicher Art oder dergleichen besteht. Auf einen solchen Träger 2 ist ein Sicherheitselement 3 aufgebracht, das im vorliegenden Fall die Struktur eines Barcodes, d.h. in Form von nebeneinander liegenden Balken ausgebildet ist, wobei zwei nebeneinander liegende Balken jeweils ein unterschiedliches Absorptionsspektrum hat, das im THz-Bereich jeweils mindestens eine Ausprägung z.B. ein Maximum aufweist. Dazu enthalten die jeweiligen Balken der Barcodestruktur des Sicherheitselements 3 ein erstes Isomer 4 und ein zweites Isomer 5 desselben organischen Moleküls. Selbstverständlich ist die Anzahl der verwendeten Isomere nicht auf zwei begrenzt, sie kann entsprechend dem gewünschten Muster gewählt werden. Es können auch mehrere Isomere von verschiedenen Molekülen verwendet werden. Dabei sind die Isomere in eine Matrix oder mehrere als Hostmaterialien eingebracht oder eingebettet, die auf den Träger aufgebracht, z.B. aufgedruckt werden und die Isomere gegen unerwünschte Einflüsse schützen, wobei sie gleichzeitig die Erkennbarkeit der Isomere zulassen.The security and / or valuable document 1 shown in the figure has a carrier 2, which consists for example of paper, cardboard, plastic, textiles or mixed forms of these, in the form of films, fabric layers of any kind or the like. On such a support 2, a security element 3 is applied, which in the present case, the structure of a bar code, ie in the form of adjacent bars is formed, wherein two adjacent bars each have a different absorption spectrum, in the THz range in each case at least one expression eg has a maximum. For this purpose, the respective bars of the barcode structure of the security element 3 contain a first isomer 4 and a second isomer 5 of the same organic molecule. Of course, the number of isomers used is not limited to two, it can be selected according to the desired pattern. It is also possible to use several isomers of different molecules. In this case, the isomers are introduced or embedded in a matrix or more as host materials, which are applied to the support, for example, printed on and protect the isomers against undesired influences, while allowing the recognizability of the isomers.

Eine mögliche Ausführungsform der für das Sicherheitselement verwendeten Isomere sind beispielsweise die Isomere der Benzoesäure, nämlich die o-, m- und p- Toluylsäure, bei denen an dem Grundmolekül der Benzoesäure eine CH3-Gruppe an unterschiedlichen Stellen des Kohlenstoffrings angesetzt sind. Das Absorptionsspektrum mit detektierbaren Maxima liegt dabei z.B. zwischen 0,6 und 1,1 THz.One possible embodiment of the isomers used for the security element are, for example, the isomers of benzoic acid, namely o-, m- and p-toluic acid, in which a CH 3 group is attached to the base molecule of the benzoic acid at different positions of the carbon ring. The absorption spectrum with detectable maxima is eg between 0.6 and 1.1 THz.

Zum Auslesen bzw. Überprüfen des Barcode des Sicherheitselements 3 wird eine Vorrichtung zum Erzeugen und kohärentem Detektieren von Terahertzstrahlung verwendet. Eine solche Vorrichtung weist üblicherweise eine gepulste Laserstrahlquelle auf, die über ein lichtempfindliches Element, z.B. eine Fotodiode eine Sendeantenne zum Erzeugen einer Terahertzstrahlung im empfindlichen Bereich der verwendeten Isomere aktiviert. Eine ebenfalls mit einem lichtempfindlichen Element versehene und durch die Laserstrahlung gegebenenfalls über Verzögerungselemente aktivierbare Empfangsantenne empfängt die ausgesandte und im Transmissions- bzw. Absorptionsverfahren durch das Sicherheitselement 3 hindurchgeleitete Terahertzstrahlung, wobei die erhaltene Messgröße beispielsweise zur Darstellung einer Absorptionskurve ausgewertet werden kann. Zur Erzeugung einer in einem Frequenzbereich kontinuierlichen Terahertzstrahlung können auch zwei Laserquellen verwendet werden, die gegeneinander verstimmt sind.For reading out or checking the barcode of the security element 3, a device for generating and coherently detecting terahertz radiation is used. Such a device usually has a pulsed laser beam source, which activates a transmitting antenna for generating a terahertz radiation in the sensitive region of the isomers used via a photosensitive element, for example a photodiode. A reception antenna, which is also provided with a light-sensitive element and can be activated by the laser radiation via delay elements, receives the transmitted terahertz radiation transmitted through the security element 3 in the transmission or absorption process, the measured variable obtained being evaluated, for example, to display an absorption curve can be. To generate a continuous terahertz radiation in a frequency range, it is also possible to use two laser sources which are detuned with respect to one another.

Die Detektion des Sicherheitselements kann mit der oben beschriebenen Vorrichtung auch im Reflexionsverfahren vorgenommen werden. Selbstverständlich können andere oder zusätzliche Techniken verwendet werden, die zu einer Verstärkung des THz-Kontrasts führen, z.B. können Heterodyn-Techniken oder andere Techniken der Frequenz-Anhebung vorgesehen werden.The detection of the security element can be carried out with the device described above also in the reflection method. Of course, other or additional techniques may be used which result in enhancement of THz contrast, e.g. For example, heterodyne techniques or other techniques of frequency enhancement may be provided.

Gemäß der Erfindung kommt eine Vielzahl von isomeren Verbindungen für die Erfindung in Frage. Als besonders geeignete Isomere aus der großen Menge organischer Moleküle sind solche zu wählen, die einen möglichst großen Kontrast, d.h., eine möglichst große Ausprägung im THz-Bereich bei Frequenzen aufweisen, für die die zur Zeit existierenden THz-Scanner vorgesehen sind. Weiterhin müssen die Isomere langzeitstabil sein und es muss ein geeignetes Host-Material für die Isomere zur Verfügung stehen.According to the invention, a plurality of isomeric compounds is suitable for the invention. Particularly suitable isomers from the large amount of organic molecules are to be selected those which have the greatest possible contrast, that is to say the largest possible extent in the THz range at frequencies for which the currently existing THz scanners are provided. Furthermore, the isomers must be long-term stable and a suitable host material for the isomers must be available.

Claims (7)

  1. A security element with a structure for characterising and/or identifying objects, wherein the structure is readable or recognisable whilst using radiation of a defined wavelength, characterised in that the structure is formed by at least two isomers (4, 5) of a substance, wherein the spectral characteristics of the at least two isomers
    - differ in the THz frequency region and are detectable for recognising the structure and
    - cannot be differentiated in the visible region, wherein
    the isomers are each incorporated or embedded into a host material and with this are arranged two-dimensionally or three-dimensionally to one another on a carrier, for forming the structure.
  2. A security element according to claim 1, characterised in that the isomers are selected in a manner such that they cannot be differentiated in the near infrared region.
  3. A security element according to one of the claims 1 to 2, characterised in that the isomers are arranged to one another with a host material in a manner such that they form a bar code or pattern code as a structure.
  4. A security element according to one of the claims 1 to 3, characterised in that the isomers are selected from structure isomers or stereo isomers.
  5. A security element according to one of the claims 1 to 4, characterised in that the substance is benzoic acid and the isomers are selected from o-toluic acid, m-toluic acid or p-toluic acid.
  6. The use of a security element for characterising and indentifying an object according to one of the claims 1 to 5.
  7. The use according to claim 6, wherein the object is designed as a security document or monetary document or as a product.
EP10704767.2A 2009-02-17 2010-02-15 Security element for marking and/or identifying objects Active EP2398653B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009009604A DE102009009604B4 (en) 2009-02-17 2009-02-17 Security element having a structure for identifying and / or identifying objects and its use for identifying and identifying an object
PCT/EP2010/001048 WO2010094494A1 (en) 2009-02-17 2010-02-15 Security element for marking and/or identifying objects

Publications (2)

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EP2398653A1 EP2398653A1 (en) 2011-12-28
EP2398653B1 true EP2398653B1 (en) 2016-11-09

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EP (1) EP2398653B1 (en)
DE (1) DE102009009604B4 (en)
WO (1) WO2010094494A1 (en)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1261790B (en) * 1962-05-23 1968-02-22 Dr Hellmut Glubrecht Procedure for the authentication of documents
US20040000787A1 (en) * 2000-04-24 2004-01-01 Rakesh Vig Authentication mark for a product or product package
DE102006017155B4 (en) * 2006-04-03 2008-08-28 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. identification element
DE102006017764A1 (en) 2006-04-12 2007-10-18 Bundesdruckerei Gmbh Security and / or value document
DE102007025891A1 (en) * 2007-06-01 2008-12-11 Johann Wolfgang Goethe-Universität Frankfurt am Main Apparatus and method for generating and detecting coherent electromagnetic radiation in the THz frequency range

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
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Also Published As

Publication number Publication date
WO2010094494A9 (en) 2010-12-02
DE102009009604A1 (en) 2010-08-19
WO2010094494A1 (en) 2010-08-26
EP2398653A1 (en) 2011-12-28
DE102009009604B4 (en) 2011-01-27

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