CA2695824A1 - Verification of security elements having windows - Google Patents

Verification of security elements having windows Download PDF

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Publication number
CA2695824A1
CA2695824A1 CA2695824A CA2695824A CA2695824A1 CA 2695824 A1 CA2695824 A1 CA 2695824A1 CA 2695824 A CA2695824 A CA 2695824A CA 2695824 A CA2695824 A CA 2695824A CA 2695824 A1 CA2695824 A1 CA 2695824A1
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CA
Canada
Prior art keywords
information
piece
display
light
substrate
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.)
Abandoned
Application number
CA2695824A
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French (fr)
Inventor
Peter Schiffmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Giesecke and Devrient GmbH
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Individual
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Filing date
Publication date
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Publication of CA2695824A1 publication Critical patent/CA2695824A1/en
Abandoned legal-status Critical Current

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    • GPHYSICS
    • G07CHECKING-DEVICES
    • G07DHANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00Testing 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
    • G07D7/06Testing 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 wave or particle radiation
    • G07D7/12Visible light, infrared or ultraviolet radiation
    • G07D7/128Viewing devices
    • GPHYSICS
    • G07CHECKING-DEVICES
    • G07DHANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00Testing 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
    • G07D7/005Testing security markings invisible to the naked eye, e.g. verifying thickened lines or unobtrusive markings or alterations
    • G07D7/0054Testing security markings invisible to the naked eye, e.g. verifying thickened lines or unobtrusive markings or alterations involving markings the properties of which are altered from original properties
    • G07D7/0055Testing security markings invisible to the naked eye, e.g. verifying thickened lines or unobtrusive markings or alterations involving markings the properties of which are altered from original properties involving markings displaced slightly from original positions within a pattern
    • GPHYSICS
    • G07CHECKING-DEVICES
    • G07DHANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00Testing 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
    • G07D7/005Testing security markings invisible to the naked eye, e.g. verifying thickened lines or unobtrusive markings or alterations
    • G07D7/0054Testing security markings invisible to the naked eye, e.g. verifying thickened lines or unobtrusive markings or alterations involving markings the properties of which are altered from original properties
    • G07D7/0056Testing security markings invisible to the naked eye, e.g. verifying thickened lines or unobtrusive markings or alterations involving markings the properties of which are altered from original properties involving markings of altered colours
    • GPHYSICS
    • G07CHECKING-DEVICES
    • G07DHANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00Testing 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
    • G07D7/06Testing 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 wave or particle radiation
    • G07D7/12Visible light, infrared or ultraviolet radiation
    • G07D7/1205Testing spectral properties
    • GPHYSICS
    • G07CHECKING-DEVICES
    • G07DHANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00Testing 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
    • G07D7/20Testing patterns thereon
    • G07D7/202Testing patterns thereon using pattern matching
    • G07D7/207Matching patterns that are created by the interaction of two or more layers, e.g. moiré patterns
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09CCIPHERING OR DECIPHERING APPARATUS FOR CRYPTOGRAPHIC OR OTHER PURPOSES INVOLVING THE NEED FOR SECRECY
    • G09C1/00Apparatus or methods whereby a given sequence of signs, e.g. an intelligible text, is transformed into an unintelligible sequence of signs by transposing the signs or groups of signs or by replacing them by others according to a predetermined system
    • G09C1/04Apparatus or methods whereby a given sequence of signs, e.g. an intelligible text, is transformed into an unintelligible sequence of signs by transposing the signs or groups of signs or by replacing them by others according to a predetermined system with sign carriers or indicators moved relative to one another to positions determined by a permutation code, or key, so as to indicate the appropriate corresponding clear or ciphered text
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09CCIPHERING OR DECIPHERING APPARATUS FOR CRYPTOGRAPHIC OR OTHER PURPOSES INVOLVING THE NEED FOR SECRECY
    • G09C5/00Ciphering apparatus or methods not provided for in the preceding groups, e.g. involving the concealment or deformation of graphic data such as designs, written or printed messages

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Credit Cards Or The Like (AREA)

Abstract

The present invention relates to a method and an apparatus for verifying security elements for value documents, such as banknotes, identification cards, payment cards or the like. The present invention further relates to a method and an apparatus for verifying or for examining valuable articles that exhibit a display, for example a computer, notebook or laptop, a cash register in a cash register system or a handheld device.

According to the present invention, a first piece of information is arranged in at least one translucent region of a security element. According to the present invention, a display displays a second piece of information at least in some regions. Either in the first or the second piece of information, or also in both pieces of information, a further piece of information is hidden that is not, or is only hardly, perceptible and/or readable for a viewer without auxiliary means. For verifying or for examining valuable articles having a display, according to the present invention, a verification element having at least one substrate having at least one light-transmitting region is used, in which a first piece of information is arranged in at least one light-transmitting region of the substrate.

According to the present invention, a verification of the security element of the valuable article occurs in that the first piece of information in the translucent region of the security element or the verification element is laid over the second piece of information and the hidden piece of information is perceptible and/or readable as a moiré pattern and/or as a metamerism.

Description

Verification of SecuritX Elements Having Windows The present invention relates to a method and an apparatus for verifying value documents, such as banknotes, identification cards, payment cards, admission tickets, drawing tickets or the like that exhibit a substrate having at least one light-transmitting region, a first piece of information being arranged in at least one light-transmitting region of the substrate. The present invention further relates to a method and an apparatus for verifying or for examining valuable articles that exhibit a display, for example a computer, notebook or laptop, a cash register in a cash register system or a handheld device.

Light-transmitting regions in security documents, such as windows, are becoming increasingly attractive. There are, for example, already different functionalities for a window in which pieces of information included in the banknote are made visible through a self-verification in that, for example, the banknote is held alternatingly over a white and black background, or is lit with a laser pointer through the window.

For example, publication WO 2006/018171 Al describes a security element whose transparent or translucent substrate is provided with an authenticating mark. Here, a phase-shifting layer and a linearly polarizing layer are applied on a transparent foil, the main axis of the phase-shifting layer being rotated by at least 10 against the polarization direction of the linearly polarizing layer. The phase-shifting layer is formed from a birefringent or an optically active material, such as a liquid crystal material, for example in the nematic or smectic phase. In transmitted light, this authenticating mark conveys a first optical impression, and in reflected light against a predetermined and easily accessible background, a second optical impression that differs significantly from the first optical impression. This
-2-facilitates a simple and quick authenticity check in which the security element is first viewed in transmitted light and is then held against a predetermined background.

The solutions in the background art make it possible for a certain authenticating mark to be perceptible, but a temporary exchange of the stored information, for example a monthly exchange of information, is not possible.

It is thus the object of the present invention to develop an authenticity check of security elements in such a way that the counterfeit protection is further increased and a temporary exchange of hidden pieces of information is made possible.

This object is solved by the features of the independent claims.
Developments of the present invention are the subject of the dependent claims.

In this context, the present invention comprises a method and an apparatus for verifying value documents, such as banknotes, securities, credit, debit or identification cards, passports, certificates, admission tickets, drawing tickets and the like, labels, packaging or other elements for product protection.
Here, a first piece of information is arranged in at least one light-transmitting region of a security element. According to the present invention, a separate display, for example a screen of a computer, notebook or laptop, a monitor of a cash register in a cash register system, or a display of a handheld device, displays, at least in some regions, a second piece of information. Either in the first or the second piece of information, or also in both pieces of information, is hidden a further piece of information that is not, or is only hardly,
-3-perceptible and,/or readable for a viewer without auxiliary means.
According to the present invention, a verification of the security element occurs in that the first piece of information in the translucent region of the security element is laid over the second piece of information and the hidden piece of information becomes perceptible and/or readable as a moire pattern and/or as a metamerism.

A particular advantage of the present invention is that the hidden piece of information includes, for example, the emission value or the currency of a banknote and can thus serve as an authenticity examination at a cash register terminal. Here, the banknote is laid over the display of the cash register terminal and the information hidden on the banknote shows up in clear lettering for the cash register personnel.

The present invention further comprises a method and an apparatus for verifying or for examining valuable articles that exhibit a display, for example a computer, notebook or laptop, a cash register in a cash register system, or a handheld device. Here, according to the present invention, a separate verification element is used that exhibits at least one substrate having at least one light-transmitting region, a first piece of information being arranged in at least one light-transmitting region of the substrate.
Furthermore, through the display, a second piece of information is displayed at least in some regions. In the first and/or second piece of information, a further piece of information is hidden that is not perceptible and/or readable for a viewer without auxiliary means. According to the present invention, a verification or examination of the valuable article occurs in that the verification element with its first piece of information is laid over the second piece of information and, in transmitted light, the hidden piece of
-4-information becomes perceptible and/or readable as a moire pattern and/or as a metamerism.

A particular advantage here is that the hidden piece of information includes, for example, the name of the owner of the valuable article, and can thus serve as a proof of ownership in the event of theft or loss of the valuable article. Here, the verification element is laid over the display of the valuable article and the piece of information hidden on the display shows up in clear lettering for the viewer, for example an investigating authority.

A display that can depict different pieces of information in alternation, or also no information, is preferably an active display having its own illumination source that illuminates the display from the back. Likewise, the display can also be a passive display without its own illumination source, a reflective surface that is arranged on the back of the display reflecting daylight or ambient light and thus illuminating the display indirectly. The present invention is preferably also applicable on a novel transparent display whose base body is perceived by a viewer as (nearly) transparent. The transparent display itself acts here as a (nearly) transparent window and the pieces of information depicted on the transparent display are depicted as a single- or multicolored clouding of the window that influences or weakens the light passing through the transparent display.

The handheld device is, for example, a mobile phone, or cell, a digital camera, digital clock, a credit card or an identification document, for example a passport or an identification card, having a display or a portable playback device for video or audio signals, such as an mp3 player or an I-pod from App1e .
-5-Within the meaning of the present invention, a piece of information is not, or is only hardly, perceptible whenever a viewer does not see or perceive it from the surrounding information without auxiliary means, or does so only by chance and weakly pronounced. In the same spirit, a piece of information is not, or is only hardly, readable whenever a viewer does not see the alphanumeric or textual content of the information from the surrounding information without auxiliary means, or does so only by chance and weakly pronounced, or cannot read or interpret it correctly.

Within the meaning of the present invention, a moire pattern is an optical appearance that can be observed upon transillumination of two stacked line-shaped or punctiform grids with a parallel or nearly parallel light beam.
Here, a uniform or non-uniform distribution of basic pattern elements at least in one region of the substrate and of the display is defined as the grid, the basic pattern elements being spaced apart. Basic pattern elements here are preferably lines, that is, elements whose width is significantly smaller than their length, and that are formed to be straight, wavy or bent, or exhibit a combination of these three embodiment types, or punctiform elements whose width is approximately the same as their length, such as points, circles or squares. If two grids that, for example, can be structured to be nearly uniform, are laid one on top of the other, then the superimposition results in light spots in certain regions and dark spots in other regions, the so-called moire pattern.

The line-shaped or punctiform grid is preferably - imprinted on the security element or the verification element from a single- or multicolored lacquer layer and/or adhesive layer, or - embossed in the substrate of the security element or of the verification element, or
-6-- produced through laser inscription of a substrate by means of measures known from the background art, such as color coupler systems in the presence of an IR absorber that is coordinated with the laser wavelength, or - produced through ablation from a contiguously applied coating.

In the latter case, the contiguously applied coating preferably consists of a metal layer and the ablation occurs through a partial demetallization of the metal layer. Here, a mechanical scraping, a laser ablation, a washing process or other methods known in the background art may be used as the demetallization. The contiguous coating can consist of an ink based on pigments or dyes. A partial ablation or sublimation of the pigments or dyes occurs through evaporation by means of laser radiation. The coating can additionally contain IR absorbers, coordinated with the wavelength of the laser radiation, to support the process.

Here, preferably, also an individualization of the hidden piece of information is possible. In this way, an arbitrary individual piece of information, such as a serial number of a banknote or the name of the owner of the display, can be introduced into the line-shaped grid. This occurs, for example, in that the arbitrary individual piece of information is introduced into a metal layer with a demetatlization.

Furthermore, the grid is preferably applied on the light-transmitting region of the valuable article or of the verification element from opacifying or opaque inks. This has the advantage that the contrast of the moire pattern is increased by this.
-7-In addition, the grid can be applied on the light-transmitting region of the valuable article or of the verification element on both sides of the light-transmitting region, that is, double-sided. Here, in each case, one grid is applied both on the front and on the reverse of the light-transmitting region, with the grid on the reverse of the light-transmitting region lying exactly opposite the grid on the front. In this way, if one looks at the light-transmitting region vertically, the two grids are superimposed such that, particularly advantageously, the hiding power of the grid is enhanced and the visibility of the moire pattern thus increased.
Alternatively, the line-shaped or punctiform grid is also produced from a lacquer and/or adhesive layer that is not, or is only hardly, visually visible.
If, for example, an adhesive is applied in a pattern via a printing process, moire patterns likewise result through a scattering of the light at the produced adhesive layer.

If the lacquer and/or adhesive layer of the grid is preferably produced through opacifying pigments and/or opacifying fillers such as Ti02, then the lacquer and/or adhesive layer is not, or is only hardly, visually visible in top view. When looked through, that is, against a background having an identical or similar color as the grid, the grid becomes visible or perceptible.
In a further embodiment, the first piece of information of the light-transmitting region is produced by means of a blind embossing of the transparent region of the substrate.

In a preferred embodiment, the valuable article or the verification element consists of a card, composed of at least two laminated substrates, that
-8-exhibits at least one light-transmitting region. Here, the grid is applied in or on at least one of the light-transmitting regions of the card, wherein - the grid is first applied to a light-transmitting substrate and the card subsequently laminated or - the card is first laminated and the grid subsequently introduced into the laminate of the card, for example by means of laser radiation.

If the valuable article or the verification element consists of a value document, for example a banknote, having a transparent foil element over a window region, then the foil element to be applied can already include the grid and appropriate overprints, for example transparent, optically variable colors. Alternatively, the foil element can exhibit no or also only individual intermediate steps, such as only the grid or only transparent, optically variable colors, that are completed after application to the valuable article or the verification element.

In the case of a foil-based substrate having opacifying and non-opacifying regions, a separate foil element is not required. In this case, the grid and appropriate overprints are applied directly to the non-opacifying region of the substrate.

A moire pattern likewise results when a grid composed of scattering elements composed of blind embossings or optical lenses is applied to the light-transmitting region of the security element or of the verification element. A piece of microinformation that is not visually visible and is coordinated with the lens embossing is depicted on the display. Especially magnification effects occur here, the piece of microinformation being depicted multiply magnified by the superimposition with the lens grid. For example, a microtext that is pictured on the display and that is not
-9-perceptible or readable for a viewer is magnified by the superimposition with an appropriate lens grid in such a way that it is easily readable for the viewer.

Within the meaning of the present invention, metamerism is a color disparity that occurs upon changing the type of light or the wavelength range of electromagnetic radiation. Two metameric inks thus appear uniform in a first wavelength range, but exhibit a different color impression in a second wavelength range. The first and second wavelength range here can be completely different or exhibit a certain overlap region. Metameric ink pairs are also referred to as conditionally identical.

Here, the metameric inks or the metameric ink pairs exhibit a comparable transparency, and if possible, include no opacifying pigments andJor opacifying fillers such as Ti02, that is, they are transparent.

In a preferred embodiment, in a first wavelength range, preferably in daylight or a similar artificial lighting, at least two metameric inks produce an identical color impression. Through the display, as a second piece of information, light is now emitted in at least a second wavelength range at which the at least two metameric inks produce at least two different color impressions.

Alternatively, in the first wavelength range, the at least two metameric inks produce at least two different color impressions. In this case, through the displav is emitted, as a second piece of information, light in at least a second wavelength range at which the at least two metameric inks produce an identical color impression.
-10-If, in both cases, the display alternatingly emits light of different wavelengths as a second piece of information, then a viewer perceives a switch between a uniformly colored area and an area composed of different colored sub-areas. This alternation preferably occurs in a chronological sequence. For example, the display emits light of a first wavelength range one second long, and thereafter, light of a second wavelength range one second long, after which the sequence repeats regularly.

However, hybrid forms of moire patterns and metamerism are also possible.
For example, the basic pattern elements of the line-shaped or punctiform grid can be imprinted from metameric inks such that, in one region, a hidden piece of information can be decoded with the aid of the moire effect, and a further hidden piece of information with the aid of the metamerism. In this way, multiple different pieces of information can be hidden in one region.

Furthermore, the first, second or the hidden piece of information can be executed to be single- or multicolored. Here, the basic pattern elements of a line-shaped or punctiform grid are preferably executed to be multicolored such that not only the usual light/ dark moire effect is created, but rather, through color mixing, also different colors or color gradations are possible.
Within the meaning of the present invention, a light-transmitting substrate is a substrate that allows impinging light to pass through in a certain proportion. If light impinges on one side of the substrate, a certain proportion of the light is passed through to the other side of the substrate and exits again there. The larger the percentage proportion of light passing through in relation to the impinging light, the more light-transmitting the substrate is. If the percentage proportion is at least 90%, that is, if, as with a window, the substrate allows the impinging light to pass through nearly
-11-unattenuated, the substrate is referred to as transparent. If a proportion of less than 90% of the impinging light, preferably between 80 and 20%, passes through the substrate, the substrate is referred to as translucent. In contrast, a substrate that allows less than 20%, preferably below 10% and particularly preferably about 0% of the impinging light to pass through, that is, in which the proportion of light passing through in relation to the impinging light is low or near or equal to zero, is referred to as opaque or as non-light-transmitting.

Particularly advantageously, the light-transmitting region of the substrate of the security element or of the verification element is a transparent or translucent plastic foil that is executed to be single- or multilayer, or a transparent or translucent region within an otherwise opaque substrate, such as a card body or a paper.
The further piece of information that is not, or is only hardly, perceptible and/or readable for a viewer without auxiliary means is hidden either in the first or the second piece of information, or also in both pieces of information.

If the hidden piece of information is located at least partially within the first piece of information, that is, on or in the substrate, then, through superimposition with the second piece of information, either the entire hidden piece of information becomes visible or readable, or only a portion of the hidden piece of information. If only a portion of the hidden piece of information becomes visible, then, by displacing the second piece of information, further portions of the hidden piece of information can become visible such that the uncovered portion of the hidden piece of information moves over the light-transmitting region of the substrate.
-12-If, in contrast, the hidden piece of information is located at least partially within the second piece of information and thus on the display, then the first piece of information serves as a decoder, that is, the hidden piece of information becomes visible or readable through superimposition with the first piece of information. Here, it is possible to depict on the display arbitrary second pieces of information that are coordinated with the first piece of information such that, also in a certain region, either static or different, varying or film-like-playing pieces of information are depictable that, however, are not visible or readable without the first piece of information. Preferably also sequences of color changes of the metameric inks or wandering dark and light regions of the moire pattern can be depicted here.

The hidden piece of information can also be located within the first and the second piece of information. Here, the first piece of information is broken down into two or more sub-areas on the security element or the verification element, where a sub-area includes the information to be verified. The second portion to be verified is depicted in the display and is arranged in such a way that it is located next to the first portion to be verified and does not overlap therewith or does so only marginally.

In a preferred embodiment of the present invention, the at least one light-transmitting region of the substrate is combined with a transparent or at least translucent further security feature. Here, this further security feature is executed such that the inventive hidden piece of information that is not perceptible and/or readable for a viewer without auxiliary means is not disrupted and thus continues to be perceptible.
-13-This further security feature consists especially of an ink having interference pigments or liquid crystals, or of an optically variable thin-film layer, as is known, for example, from WO 2005/108110. Here, an optically variable ink having interference pigments is, for example, an ink having optically variable pigments that exhibit at least one interference-capable, multilayer structure, as is known, for example, from DE 10 2006 062 281. As explained in DE 10 2006 062 281, these optically variable pigments can be altered with a laser in such a way that, as an additional effect, another appearance results in transmitted light than in reflected light. A further example of an optically variable ink is a so-called Iriodin ink.

An ink having liquid crystals or pigments composed of liquid crystals is known, for example, from WO 2006/018171 A2, cited in the introduction to this description. It has especially the property of exhibiting another appearance or another color in front of a dark or black background than in front of a light or white background. Furthermore, it has the property that, regardless of the background, at a certain viewing angle or angle range, the so-called glancing angle, it appears in a certain color, and at another viewing angle or angle range, does not appear.
The further security feature can be areal or patterned, for example an areal pattern.

Furthermore, the further security feature can be executed such that it can be perceived with a certain auxiliary means, in the case of ink having liquid crystals or pigments composed of liquid crystals, for example, with the aid of a polarizing filter.
-14-Particularly preferably, the further security feature correlates with the inventive piece of information that is hidden and not perceptible and/or readable for a viewer without auxiliary means. In this way, the inventive hidden piece of information can depict, for example, the number "50" and the further security feature the lettering "EURO".

Furthermore, the further security feature and the inventive hidden piece of information can complement each other. For example, the further security feature depicts the lettering "EU" and the inventive hidden piece of information the lettering "RO" and thus together "EURO".

Alternatively, the inventive hidden piece of information is called up at the same time as the further security feature by tilting, in that the substrate having the at least one light-transmitting region is tilted. Likewise, the inventive hidden piece of information can be verified as a complement at the same time as the further security feature by applying a polarizing filter to the print pattern.

If the light-transmitting region of the substrate of the security element or of the verification element is a transparent or translucent plastic foil, the plastic foil can additionally be developed as a polarizing filter. A contrast enhancement of the uncovered hidden piece of information preferably results in the form of the moire pattern or the metamerism.

In addition, also the light-transmitting region of the substrate can exhibit a polarizing effect.

The uploading of the appropriate current second piece of information to the display or to the electronics that control the display occurs via the Internet,
-15-by e-mail, in the case of mobile phones also as an SMS, or via removable storage media such as memory cards, flash cards or CDs/DVDs.

A preferred application of the present invention results, for example, when proving the ownership of a mobile device, such as a mobile phone. On an identification card as a verification element, a first piece of information is depicted in a light-transmitting region, and an image having a second piece of information is displayed on the mobile phone. If the owner of the mobile phone now lays the identification card over the display of the mobile phone, a hidden piece of information becomes visible that includes, for example, the name of the owner. In a first alternative possibility here, the hidden piece of information is located in the first piece of information on the identification card, which must be executed to be personalized to the owner therewith. In the second possibility, the hidden piece of information is located on the display of the mobile phone, the identification card being, for example, identical for all owners of mobile phones of the associated network operator or the associated manufacturer of the mobile phone. Here, the hidden piece of information is particularly preferably stored on the SIM card of the owner or is produced according to a certain method via the personalized SIM card.
A further preferred application relates to drawing tickets having a win functionality, on which a light-transmitting region, especially a window having a first piece of information, is located. The owner of the drawing ticket is sent, for example via SMS or via e-mail, a second piece of information that he can display on the display of a mobile phone or a computer. The owner now holds the drawing ticket over the display and immediately establishes whether the drawing ticket is a winner or a blank.
Here, both possibilities exist, that the hidden piece of information is located, on the one hand, in the drawing ticket itself, or on the other hand, in the
-16-second piece of information transmitted by SMS or e-mail. In the first case, the owner sends the drawing ticket to the initiator of the contest as proof, and in the second case, the proof is provided via the personalized SMS or e-mail.
The advantages of the present invention will be explained with reference to the following examples and supplementing drawings. The individual features described and the exemplary embodiments described below are inventive in themselves, but are also inventive in combination. The examples depict preferred embodiments, to which, however, the present invention is in no way intended to be limited. The proportions shown in the figures do not correspond to the actual ratios and serve solely to improve clarity.

In detail, depicted schematically are:

Fig. 1 a banknote having a window and grid having a first piece of information, in top view and/or when looked through, Fig. 2 a screen having a grid having a second piece of information, in top view, Fig. 3 the screen from fig. 2 and the banknote from fig. 1, one on top of the other, Fig. 4 a cell display having a grid having a second piece of information, in top view, Fig. 5 the cell display from fig. 4 and the banknote from fig. 1, one on top of the other,
-17-Fig. 6 a banknote having a window and two hidden pieces of information composed of a moire pattern and a metamerism within a first piece of information, in top view, or top view and when looked through, Fig. 7 the screen from fig. 2 and the banknote from fig. 6, one on top of the other, Fig. 8 an areal geometry for a metameric ink pair, in top view, Fig. 9 a screened geometry for a metameric ink pair, in top view, Fig. 10 a valuable article or a verification element composed of a substrate having a light-transmitting region and a first piece of information arranged in the shape of a grid on the front, in side view, Fig. 11 the valuable article or the verification element from fig. 10 having a grid on the reverse, exactly opposite the grid on the front, Fig. 12 the valuable article or the verification element from fig. 10, on the front, partially overprinted with an optically variable ink, Fig. 13 the valuable article or the verification element from fig. 12 having a further optically variable ink on the reverse, Fig. 14 the valuable article or the verification element from fig. 11 on the front and reverse, each partially overprinted with an optically variable ink,
-18-Fig. 15 the valuable article or the verification element from fig. 12 having a portion of the grid composed of lithopone and a portion composed of an opacifying black ink, Fig. 16 the valuable article or the verification element from fig. 15, additionally on the reverse having a grid composed of lithopone and a portion composed of an opacifying black ink, overprinted with the optically variable ink, Fig. 17 the valuable article or the verification element from fig. 15, but having two different optically variable inks, Fig. 18 the valuable article or the verification element from fig. 15 having a grid composed of an opacifying chromatic ink on the reverse, Fig. 19 the valuable article or the verification element from fig. 10, the grid consisting of three-laver thin-film elements, Fig. 20 one of the valuable articles or verification elements from fig. 15 to 18, in top view from the front or reverse, the lines of the grid for lithopone and for the black ink being executed to be joint to joint, Fig. 21 one of the valuable articles or verification elements from fig. 16 and 17, in top view from the opposing side with respect to fig. 20, the lines of the grid for lithopone and for the black ink being executed to be joint to joint.

Examples of different preferred embodiments of the present invention are explained in the following with reference to the figures. For the sake of better
-19-comprehensibility, the illustrations in the figures are highly schematized and do not reflect the real conditions. For this, for the sake of better comprehensibility, the described embodiments are reduced to the essential core information. In practical implementation, significantly more complex patterns or images in single- or multicolor printing can be used. The pieces of information depicted in the following examples can likewise be replaced by any complex pieces of image or text information.

The different exemplary embodiments are also not limited to the use in the form described, but rather can also be combined with each other to increase the effects.

A first exemplary embodiment relates to the verification of a banknote with a display of a computer. In fig. I is depicted a banknote 1 having a window 2 in which a grid having a hidden piece of information is located. The grid is formed, for example, by a line grid, the hidden piece of information being formed by microscopically small offsets of individual lines in a certain region of the line grid. The microscopically small offsets of individual lines are executed in such a way that they are not perceptible with the naked eye, their border or their contour shape including a piece of alphanumeric or graphic information.

Fig. 2 shows a liquid crystal screen 3 of a computer. A grid 5 having a second piece of information is located in a defined region of the screen 3. In addition, a template 4 that is coordinated with the banknote 1 is pictured in screen 3. If the banknote 1 is laid on the screen 3 such that it is arranged with its contour flush in the template, in accordance with fig. 3, then the grid 5 and the window 2 lie exactly on top of one another.
-20-Here, the hidden piece of information 6 becomes visible in the window 2 of the banknote 1. In this case, the hidden piece of information 6 is, for example, the number "50", that is, the denomination of the banknote. However, also any arbitrary other piece of information can be hidden in the grid of the window 3, for example an alphanumeric character or a graphic image.
The grid 5 particularly advantageously consists of a film-like sequence of different grids such that also a film-like sequence of different pieces of information results as the hidden piece of information 6, for example:

- one second, no information is displayed, in the form of a white field, - thereafter, the numeral "5" is displayed for one second, - thereafter, the numeral "0" is displayed for one second, - thereafter, the letter "T" is displayed for one second, - thereafter, the letter "A" is displayed for one second, - thereafter, the letter "L" is displayed for one second, - thereafter, the letter "E" is displayed for one second, - thereafter, the letter "R" is displayed for one second, whereupon the series begins again from the start. Thus, altogether, the information "50 TALER" is displayed in sequence.

In a second exemplary embodiment, instead of a computer screen, a screen of other stationary or mobile data processing and communication devices is used, as is illustrated by way of example in fig. 4 and fig. 5. Here, the window 2 of the banknote 1 is laid over the display 7 of a mobile phone, the grid 5 being pictured in the display 7.

In a third exemplary embodiment, according to fig. 6, two hidden pieces of information are located within a first piece of information in the window 8 of the banknote 1, the first piece of information being formed by a line grid that
-21-consists of a first metameric ink. The one hidden piece of information 10 is formed by a phase shift of the line grid, the contour shape of the phase shift resulting in the letter "L". The other hidden piece of information 9 is formed by a change in the metameric ink such that, together with the metameric ink of the first piece of information, a metameric ink pair results. The contour shape of the hidden piece of information 9 yields the numeral "5".

The banknote 1 is now laid, in accordance with the first exemplary embodiment from fig. 2, on the display 3 having the grid 5. The grid 5 now shows the following second piece of information in sequence:

- contiguously, a first color, such as the color white, in which no information is displayed in the window 8 of the banknote, - contiguouslv, another color, such as the color red, in which the hidden piece of information 9 is displayed in the form of the numeral "5" in the window 8 of the banknote, - contiguously, a second line grid that is matched with the line grid of the first piece of information and, in combination, yields a moire pattern such that, according to fig. 7b, the hidden piece of information 10 is displayed in the form of the letter "L" in the window 8 of the banknote.
A fourth exemplary embodiment relates to the geometric arrangement of a metameric ink pair in the window of a valuable article. According to fig. 8, in a window 13 of a banknote 1, the background is imprinted areally with a first metameric ink 11 and, in front of the background, a numeral "5" in a second metameric ink 12.

Alternatively, the information is imprinted on the window as a dot grid according to fig. 9, a portion 14 that forms the background being imprinted
-22-in a first metameric ink, and a portion 15 that forms the numeral "5" in a second metameric ink, as individual dots.

The following exemplary embodiments relate to concrete embodiments of the valuable article or of the verification element.

Fig. 10 shows a valuable article or a verification element composed of a substrate 20 having a light-transmitting region 21, in side view. The light-transmitting region 21 is formed by an opening or a hole in the substrate that is covered with a transparent foil 22. Here, the foil 22 can be applied directly to the edge region of the hole in the substrate 20, as shown in fig. 10, or to a depression in the edge region of the hole such that the surface of the front of the foil 21 is flush with the surface of the substrate. Alternatively, the foil can also be embedded in the substrate such that the substrate surrounds the edge region of the foil.

On the front of the foil is arranged, in the shape of a grid, a first piece of information that consists of opaque basic pattern elements 23 composed of lithopone.
According to fig. 11, on the reverse of the foil 22 can additionally be arranged a further grid composed of basic pattern elements 24 that lie exactly opposite the basic pattern elements 23 on the front. Particularly preferably, also the basic pattern elements 24 are executed to be composed of lithopone or opacifying inks such that the hiding power of the grid is further increased when looked through. Here, no additional information change is created by tilting the valuable article or the verification element.
-23-Fig. 12 shows the valuable article or the verification element from fig. 10, the grid on the front being covered at least in some regions with a transparent layer 25 having Iriodin pigments and/or composed of liquid crystal material, especially composed of cholesteric liquid crystal material.

Such a transparent layer 25 composed of liquid crystal material, especially composed of cholesteric liquid crystal material, is known, for example, from WO 2006/018171 A2, cited in the introduction to this description, whose disclosure in this respect is fully incorporated herein by reference. This transparent layer has the property that it displays another appearance against a light or white background than against a dark or black background.
Thus, against a white background, the transparent layer 25 shows no further piece of information, since the white background and the basic pattern elements 23 composed of lithopone exhibit a similar and preferably the same color tone. In particular, the basic pattern elements 23 are executed to be so small in their lateral dimension that they are not perceptible for a viewer.
Against a dark or black background, however, the valuable article or the verification element displays the contour shape of the transparent layer 25 as a further piece of information. The further piece of information can preferably constitute an alphanumeric text, a graphic, a barcode, a pictographic illustration, such as the image of a person, or an arbitrary pattern.

However, the further piece of information is perceptible not only over a dark or black background, but rather, regardless of the background, also by tilting the valuable article or the verification element. In this way, a viewer sees the further piece of information also against a white background at a certain angle range, the so-called glancing angle.
-24-In an exemplary embodiment according to fig. 13, the valuable article or the verification element from fig. 12 can also be provided on the reverse with a further transparent layer 26, having Iriodin pigments and/or composed of liquid crystal material, that can, for example, also protrude beyond the edge of the opening in the substrate 20. The viewer thus perceives, also from the reverse of the valuable article or the verification element, a further piece of information that can correspond to the further piece of information on the front or depicts another piece of information. If the transparent layer 26 protrudes over the edge of the opening in the substrate 20, a further piece of information or a complementary piece of information preferably results.

To increase the hiding power of the grid when looked through, according to fig. 14, between the foil 22 and the transparent layer 26 can be arranged, in accordance with fig. 11, a further grid composed of basic pattern elements 24 that lie exactly opposite the basic pattern elements 23 on the front.

Fig. 15 shows the valuable article or the verification element from fig. 12, a portion of the grid being executed to be composed of lithopone 23 and a portion composed of an opacifying black ink 27. Here, when looked through, the same effect results for a viewer as from fig. 12. In top view, however, the piece of information of the grid elements executed with black ink 27 shows.
At a tilt angle, the piece of information of the transparent layer 25 shows.
The portion of the grid executed in lithopone 23 is not perceptible when looked through.

Fig. 16 shows the valuable article or the verification element from fig. 15, a grid composed of lithopone and a portion composed of an opacifying black ink additionally being arranged on the reverse. The lithopone on the front covers the information of the black ink on the reverse and vice versa. In this
-25-way, it is possible to depict on the front and reverse different pieces of information that are perceptible in top view. In addition, the grid can be overprinted on the reverse with a transparent layer 25.

If the same pieces of information are pictured on both sides of the foil 22, then the same further piece of information appears, in each case right-reading, on both sides of the valuable article or the verification element.
Alternatively, according to fig. 17, the reverse is printed on with a transparent layer 26 that is different from the transparent layer on the front such that the color impression of the further piece of information on the front differs from that on the reverse.

Fig. 18 shows the valuable article or the verification element from fig. 15 additionally having a grid composed of lithopone 24 and an opacifying chromatic ink 29 on the reverse. For the viewer, an additional piece of information results on the reverse due to the opacifying chromatic ink, without the piece of information to be verified by means of a display being disrupted.
Alternatively, the first piece of information from fig. 10 can also consist of at least three-layer thin-film elements arranged like a grid, according to fig.
19.
Here, when the valuable article or verification element is tilted, the color of the thin-film element changes, for example from green to magenta.

Fig. 20 shows one of the valuable articles or verification elements from fig.

to 18, in top view from the front or reverse, the lines of the grid for lithopone 23 and for the black ink 27 being executed to be joint to joint.
-26-Fig. 21 shows one of the valuable articles or verification elements from fig.

and 17, in top view from the opposing side with respect to fig. 20, the lines of the grid for lithopone 24 and for the black ink 28 being executed to be joint to joint.

Alternatively, it is also possible to use on the front and/or reverse, instead of black ink, an opacifying chromatic ink.

In general, instead of a line grid, also a dot grid, for example, can of course be used.

Furthermore, in figures 12 to 21, especially the visually visible information can protrude over the light-transmitting region 21 to depict a further piece of information or a complementary piece of information.

Claims (22)

Claims
1. A method for verifying value documents, such as banknotes, identification cards, payment cards, admission tickets, drawing tickets or the like that exhibit a substrate having at least one light-transmitting region, - wherein, in at least one light-transmitting region of the substrate, a first piece of information is arranged, - wherein a separate display is used, - wherein, through the separate display, at least in some regions, a second piece of information is displayed that correlates with the first piece of information, - wherein, in the first and/or second piece of information, a further piece of information is hidden that is not perceptible and/or readable for a viewer without auxiliary means, - wherein the substrate with its first piece of information is laid over the second piece of information that is displayed on the separate display, - wherein, in transmitted light, the hidden piece of information is perceptible and/or readable as a moire pattern and/or as a metamerism, and - wherein the at: least one light-transmitting region of the substrate is combined with a transparent or at least translucent further security feature that is executed such that the inventive hidden piece of information that is not perceptible and/or readable for a viewer without auxiliary means is not disrupted and thus continues to be perceptible.
2. A method for verifying or for examining valuable articles that exhibit a display, - wherein a separate verification element is provided that exhibits at least one substrate having at least one light-transmitting region, a first piece of information being arranged in at least one light-transmitting region of the substrate, - wherein, through the display, at least in some regions, a second piece of information is displayed that correlates with the first piece of information, - wherein, in the first and/or second piece of information, a further piece of information is hidden that is not perceptible and/or readable for a viewer without auxiliary means, - wherein the substrate with its first piece of information is laid over the second piece of information that is displayed on the display, - wherein, in transmitted light, the hidden piece of information is perceptible and/or readable as a moire pattern and/or as a metamerism, and - wherein the at least one light-transmitting region of the substrate is combined with a transparent or at least translucent further security feature that is executed such that the inventive hidden piece of information that is not perceptible and/or readable for a viewer without auxiliary means is not disrupted and thus continues to be perceptible.
3. The method according to claim 1 or 2, characterized in that, as a further security feature, a security feature is provided that consists of an ink having interference pigments or liquid crystals or of an optically variable thin-film layer.
4. The method according to at least one of claims 1 to 3, characterized in that, as a further security feature, a security feature is provided that is areal or patterned.
5. The method according to at least one of claims 1 to 4, characterized in that the further security feature is executed such that it can be perceived with a certain auxiliary means, such as a polarizing filter.
6. The method according to at least one of claims 1 to 5, characterized in that, as the further security feature, a security feature is provided that correlates with the piece of information that is hidden and not perceptible and/or readable for a viewer without auxiliary means, or complements the hidden piece of information.
7. The method according to at least one of claims 1 to 6, characterized in that the hidden piece of information and the further security feature are called up simultaneously by tilting the substrate having the at least one light-transmitting region.
8. The method according to at least one of claims 1 to 6, characterized in that the hidden piece of information and the further security feature are verified simultaneously by laying a polarizing filter on the at least one light-transmitting region.
9. The method according to at least one of claims 1 to 8, characterized in that the first and second piece of information is formed by a grid.
10. The method according to claim 9, characterized in that the grid is formed by a uniform or non-uniform distribution of basic pattern elements at least in one region of the substrate and of the display, the individual basic pattern elements being arranged spaced apart.
11. The method according to at least one of the preceding claims, characterized in that a grid composed of scattering or lens-shaped elements is applied to at least one light-transmitting region of the security element, and a piece of microinformation that is not visually readable and/or visible and that is coordinated with the lens pattern is depicted on the display.
12. The method according to at least one of claims 1 to 10, characterized in that a line-shaped or punctiform grid is applied to the light-transmitting region in the security element, and a piece of grid information that is not visually visible and that is coordinated with the line-shaped or punctiform grid is displayed on the display.
13. The method according to at least one of claims 1 to 8, characterized in that the first piece of information is formed by at least two metameric inks.
14. The method according to claim 13, characterized in that, in a first wavelength range, the at least two metameric inks produce an identical color impression and, through the display, as a second piece of information, light is emitted in at least a second wavelength range in which the at least two metameric inks produce at least two different color impressions.
15. The method according to claim 13, characterized in that, in a first wavelength range, the at least two metameric inks produce at least two different color impressions and, through the display, as a second piece of information, light is emitted in at least a second wavelength range in which the at least two metameric inks produce an identical color impression.
16. The method according to one of claims 14 and 15, characterized in that, through the display, as a second piece of information, light of different wavelengths is emitted alternatingly.
17. The method according to one of claims 14 to 16, characterized in that the metameric inks or the metameric ink pairs exhibit a comparable transparency that include, if possible, no opacifying pigments and/or opacifying fillers, such as TiO2.
18. The method according to at least one of the preceding claims, characterized in that the second piece of information is displayed statically or alternating regularly or irregularly on the display and/or is played as a film sequence on the display.
19. The method according to at least one of the preceding claims, characterized in that the second piece of information is transmitted to the display via the Internet, as an e-mail, as an SMS or through analog or digital storage media.
20. The method according to at least one of the preceding claims, characterized in that at least one light-transmitting region of the substrate is formed by a transparent window.
21. An apparatus for executing the method according to at least one of claims 1 and 3 to 20, characterized in that the display is a screen of a computer, notebook or laptop, a monitor of a cash register in a cash register system, or a display of a handheld device.
22. An apparatus for executing the method according to at least one of claims 2 to 20, characterized in that the valuable article having a display is a computer, notebook or laptop, a cash register in a cash register system or a handheld device.
CA2695824A 2007-08-09 2008-08-08 Verification of security elements having windows Abandoned CA2695824A1 (en)

Applications Claiming Priority (3)

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DE102007037576.1 2007-08-09
DE102007037576A DE102007037576A1 (en) 2007-08-09 2007-08-09 Verification of security elements with windows
PCT/EP2008/006572 WO2009019038A1 (en) 2007-08-09 2008-08-08 Verification of security elements with windows

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