EP1404526A1 - Matiere pour support d'informations a l'epreuve des falsifications, support d'informations fabrique a partir de ladite matiere et dispositif de verification - Google Patents
Matiere pour support d'informations a l'epreuve des falsifications, support d'informations fabrique a partir de ladite matiere et dispositif de verificationInfo
- Publication number
- EP1404526A1 EP1404526A1 EP01960397A EP01960397A EP1404526A1 EP 1404526 A1 EP1404526 A1 EP 1404526A1 EP 01960397 A EP01960397 A EP 01960397A EP 01960397 A EP01960397 A EP 01960397A EP 1404526 A1 EP1404526 A1 EP 1404526A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- information carrier
- state
- carrier material
- information
- photochromic substance
- 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.)
- Granted
Links
Definitions
- the invention relates to a tamper-proof information carrier material comprising a substrate and at least one photochromic substance which can be converted from a first state into at least a second state by light irradiation, which can be distinguished from the first state spectroscopically, and to an information carrier and a device produced therefrom to test it.
- the invention is based on the object of providing an information carrier material with increased protection against forgery, information carriers produced therefrom and a device for testing it.
- the photochromic substance is embedded in the substrate and the substrate is sufficiently transparent to the light wavelengths used to convert the first to the second state.
- the photochromic substance is embedded in the substrate in the information carrier material according to the invention, a qualitatively good forgery would presuppose that the counterfeiter himself produces or procures the substrate doped with the photochromic substance.
- the former is practically impossible due to the high technical outlay, whereas the latter is also not possible due to the lack of general access to such special substrates.
- An attempt at counterfeiting by superficially applying the substance to the substrate can easily be ascertained because of the associated change in the surface properties, for example by optical methods.
- a highly absorbent or scattering material is often used as the substrate, preferably paper, cardboard, plastic or mixtures thereof. Sufficient permeability of the substrate is provided if its transmission is between 0.001% and 80%, preferably between 0.01% and 30%.
- the first and second states of the photochromic substance can in particular be isomeric states.
- bistable it is possible to permanently convert the information carrier material locally into a second state by means of targeted light irradiation, which means an initialization according to a local pattern of two states.
- This local pattern can serve in particular as a code for information that can be used for the authenticity check.
- the techniques required for this are known (see e.g. Science,
- An advantageous development consists in that at least one second state can be returned to the first state by light irradiation and the substrate is sufficiently transparent for these light wavelengths. This makes it possible to delete at least parts of the pattern generated during initialization or a pattern recorded separately therefrom and to overwrite it with a pattern corresponding to new information.
- this erasable second state can be the same state as the second state used for initialization, but different second states can also be used. Because of this rewritability, it is not only possible to describe an information carrier produced on the information carrier material with additional information from case to case, but also to provide earlier information overwrite, ie replace with new information. If such an information carrier passes through several stations at which it is sighted and each sighting station has a corresponding visa, the route of the information carrier through the various sighting stations can be followed exactly.
- the desired properties in particular the good optical distinguishability of the two photochromic states, can be found in particular in the chromoproteins.
- a bacterial chromoprotein is preferably used.
- a particularly suitable and scientifically well-studied substance is bacteriorhodopsin. It is known that this substance can be switched between isomeric states, for example, by single-photon, sequential single-photon or two-photon processes in which light is irradiated in the green spectral range and light in the red spectral range. It is known that with the wild type of bacteriorhodopsin and to a greater extent with some variants of bacteriorhodopsin, two thermally stable states are available.
- intermediate states cf. EP0655162B1 and “Popp et al., Photochemical Conversion of the O-intermediate to 9 -c / s Retinal Containing Products in Bacteriorhodopsin Films. Biophys. J., 65 (1993) 1449-1459 ").
- local areas of bacteriorhodopsin in the substrate can be thermally permanently initialized.
- the initialization in the Q- Distressed districts when illuminated with light in the red spectral range, appear optically more transparent than the other districts that remained in the b R
- the photochromic substance is localized on particles in the information carrier material.
- each embedding location of a carrier particle can be operated like a localized storage element, the storage state of which is represented by the absorption state of the photochromic substance concentrated there.
- the particles can be localized, for example, by applying the photochromic material to their surface or enclosing them in their volume.
- the particles themselves can also be produced from the photochromic substance (s), possibly with the addition of suitable auxiliary substances.
- An advantageous embodiment consists in that the photochromic substance is enclosed in particles or hollow bodies embedded in the substrate, the Substance-enclosing matrix or wall for which the wavelengths used to convert the first to the second state and the wavelengths used to distinguish the two states are sufficiently transparent.
- the photochromic substance is protected by the inclusion in the hollow body.
- optimal conditions for the photochromic substance for example its moisture content, can be set within the hollow body.
- the optical properties of the matrix or wall can be optimized with regard to the optical processes of light absorption during initialization and light irradiation when reading out and, if necessary, when deleting the states, for example low light scatter and high optical transparency of the matrix material.
- the substrate is a paper.
- This paper can preferably be used for the production of banknotes, checks and all other certificates.
- An information carrier produced from the information carrier material according to the invention is distinguished according to the invention in that the substance transferred into the second state is localized at at least one point on the information carrier.
- the localized transfer of the photochromic substance into its second state can be carried out as an initialization step either on the information carrier material or on the information carrier produced therefrom. In both cases, the local position of this point (s) in the information carrier can be detected in a subsequent optical scanning process and the authenticity of the information carrier can thereby be checked.
- This position information can be recorded on the information carrier, for example, in the form of printed position information data or also by storing it in a readable electronic memory that is inseparably connected to the information carrier. During the authenticity check, the recorded position information can then be read out and the information determined by the pattern of the positions in the second state can be scanned and related to one another.
- a method for the three-dimensional storage of information using bacteriorhodopsin is specified in US 5,559,732. However, in no case is it assumed that the bacteriorhodopsin is embedded in a matrix that is only transparent to a limited extent.
- the information carrier in addition to printing it is generally known that it is stored in a memory circuit provided in the security (cf. DE 196 30 648 A1 and EP 0 905 657 A1).
- Fig. 1 is a supervision of a banknote
- FIG. 2 shows a cross section perpendicular to the representation of FIG. 1 with a schematic representation of the light profiles during the testing process.
- a banknote 1 shown in FIG. 1 consists of a banknote paper which has been doped with a photochromic substance, bacteriorhodopsin in the illustrated embodiment, during its production.
- the doping can be carried out, for example, by adding the bacteriorhodopsin to the pulp used for the production of the banknote paper before it is fed to the screen.
- the banknote has an essentially constant doping density over its entire area.
- the doping can also be carried out in such a way that the pulp spread on the sieve is doped only in places, so that the banknote paper and also the banknote 1 have localized areas which can either be distributed uniformly or irregularly over the entire area.
- the photochromic substance is preferably not introduced directly into the paper pulp, but with the aid of carrier particles provided with the substance.
- the latter are preferably designed as small hollow bodies in which the photochromic substance is enclosed and thereby protected against the surrounding paper pulp. In general, the doping of the banknote paper and the banknote 1 cannot be seen with the naked eye.
- the presence of the embedded photochromic substance can be present in a distributed form or in a form bound to particles
- the initial state designated as b R and that by irradiation with light in the green are suitable for this or yellow-red spectral range M state can be generated.
- the transient generation of bacteriorhodopsin in the M state can be detected with blue light, preferably in the range 400-415 nm.
- the photochromic substance has the property that it has at least two thermally stable states, whereby it can be converted from one state to the other by light absorption, information can also be introduced into the information carrier material.
- the initial state designated as b R and the Q state obtainable therefrom by the irradiation of light in the green spectral range and of light in the red spectral range are suitable for this.
- the paper pulp is sufficiently radiolucent in spectral ranges.
- borders 2 in FIGS. 1 and 2. 1 and 2 show just three such locations 2, any number of such locations that is> 1 can be provided in any local arrangement.
- the local position of these positions i. H. whose location coordinate values are recorded on bank note 1 and this position information is recorded on bank note 1.
- the latter can be done, for example, in the form of an uncoded or coded imprint 3 on the banknote 1, which can be read optically, for example.
- this imprint is exemplified by a sequence of decimal digits.
- the locations 2 formed by the initialization can be optically distinguished from the uninitialized remaining area of the banknote 1.
- the present at the positions 2 Q-state of the positions 2 surrounding b R - condition characterized discriminated that low intensity light in the red spectral region, but which is not absorbed only by the b R state the Q state, is irradiated.
- the places 2 appear more translucent than their surroundings.
- the resulting light-dark pattern can be scanned in this way and the position information for the locations 2 can be read out therefrom.
- FIG. 2 A device suitable for this is indicated schematically in FIG. 2 and is designated by reference number 5.
- An arrow 6 indicates the direction of the light irradiated for writing or reading.
- the bacteriorhodopsin required Green and red rays of light shone onto the same side of banknote 1.
- the green light is radiated onto the lower side of the banknote 1 in FIG. 2
- the red light is incident on the upper side of the banknote 1 in the form of a bundled scanning beam.
- the bank note 1 is set into a scanning movement transversely to the direction of this scanning beam. The same applies to the blue light for the detection of the M state if there are no two long-term thermally stable states in the bacteriorhodopsin.
- the position information characterizing the locations 2 is reconstructed from the scanning result.
- the device 5 also reads the position information 3 recorded on the bank note 1. The authenticity of the banknote 1 is checked by comparing the reconstructed and the recorded position information.
- a device constructed according to the diagram of FIG. 2 can also be used for initializing, ie for initially writing the bank note 1 or for later writing with additional information with previous information previously deleted.
- initializing light in the green and red spectral range is irradiated in the direction of arrow 6, as is necessary for converting the b R initial state into the Q state.
- To delete the Q state light in the blue spectral range is irradiated in the direction of arrow 6, as a result of which the Q state returns to the b R initial state.
- the deleted areas can be described again.
- the two possible states at these recording points represent the two binary values "0" and "1".
- a key can be formed from the recorded bit pattern, which key is printed, for example, in an optically readable form on the surface of the information carrier or stored in an electronic circuit embedded therein.
- the grid of the recording points is two-dimensional, whereas in the case of spatially extended information carriers it can be three-dimensional.
Landscapes
- Inspection Of Paper Currency And Valuable Securities (AREA)
- Credit Cards Or The Like (AREA)
Abstract
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2001/007315 WO2003002351A1 (fr) | 1999-12-21 | 2001-06-27 | Matiere pour support d'informations a l'epreuve des falsifications, support d'informations fabrique a partir de ladite matiere et dispositif de verification |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1404526A1 true EP1404526A1 (fr) | 2004-04-07 |
EP1404526B1 EP1404526B1 (fr) | 2010-06-30 |
Family
ID=31984987
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01960397A Expired - Lifetime EP1404526B1 (fr) | 2001-06-27 | 2001-06-27 | Matiere pour support d'informations a l'epreuve des falsifications, support d'informations fabrique a partir de ladite matiere et dispositif de verification |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1404526B1 (fr) |
AT (1) | ATE472414T1 (fr) |
DE (1) | DE50115540D1 (fr) |
ES (1) | ES2347764T3 (fr) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012083469A1 (fr) | 2010-12-22 | 2012-06-28 | U-Nica Technology Ag | Procédé et dispositif d'authentification de documents marqués par des systèmes photochromes |
DE102011010127A1 (de) | 2011-02-02 | 2012-08-02 | Giesecke & Devrient Gmbh | Authentizitätssicherung von Wertdokumenten mittels photochromer Farbstoffe |
DE102014011692A1 (de) | 2014-08-07 | 2016-02-11 | Giesecke & Devrient Gmbh | Sicherheitselement mit photochromem Farbstoff |
-
2001
- 2001-06-27 DE DE50115540T patent/DE50115540D1/de not_active Expired - Lifetime
- 2001-06-27 ES ES01960397T patent/ES2347764T3/es not_active Expired - Lifetime
- 2001-06-27 EP EP01960397A patent/EP1404526B1/fr not_active Expired - Lifetime
- 2001-06-27 AT AT01960397T patent/ATE472414T1/de active
Non-Patent Citations (1)
Title |
---|
See references of WO03002351A1 * |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012083469A1 (fr) | 2010-12-22 | 2012-06-28 | U-Nica Technology Ag | Procédé et dispositif d'authentification de documents marqués par des systèmes photochromes |
US9418282B2 (en) | 2010-12-22 | 2016-08-16 | U-Nica Technology Ag | Method and device for authenticating documents marked with photochromic systems |
DE102011010127A1 (de) | 2011-02-02 | 2012-08-02 | Giesecke & Devrient Gmbh | Authentizitätssicherung von Wertdokumenten mittels photochromer Farbstoffe |
EP2484537A2 (fr) | 2011-02-02 | 2012-08-08 | Giesecke&Devrient | Authentification de documents de valeur à l'aide de colorants photochromes |
EP2484537A3 (fr) * | 2011-02-02 | 2014-08-20 | Giesecke&Devrient | Authentification de documents de valeur à l'aide de colorants photochromes |
DE102014011692A1 (de) | 2014-08-07 | 2016-02-11 | Giesecke & Devrient Gmbh | Sicherheitselement mit photochromem Farbstoff |
Also Published As
Publication number | Publication date |
---|---|
ATE472414T1 (de) | 2010-07-15 |
DE50115540D1 (de) | 2010-08-12 |
ES2347764T3 (es) | 2010-11-04 |
EP1404526B1 (fr) | 2010-06-30 |
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