EP3390064B1 - Security element with hidden information - Google Patents

Security element with hidden information Download PDF

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Publication number
EP3390064B1
EP3390064B1 EP16810423.0A EP16810423A EP3390064B1 EP 3390064 B1 EP3390064 B1 EP 3390064B1 EP 16810423 A EP16810423 A EP 16810423A EP 3390064 B1 EP3390064 B1 EP 3390064B1
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EP
European Patent Office
Prior art keywords
security element
prints
print
wavelengths
element according
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.)
Active
Application number
EP16810423.0A
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German (de)
French (fr)
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EP3390064A1 (en
Inventor
Guillaume CHAPEAU
Xavier Borde
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.)
Oberthur Fiduciaire SAS
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Oberthur Fiduciaire SAS
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Application filed by Oberthur Fiduciaire SAS filed Critical Oberthur Fiduciaire SAS
Priority to PL16810423T priority Critical patent/PL3390064T3/en
Publication of EP3390064A1 publication Critical patent/EP3390064A1/en
Application granted granted Critical
Publication of EP3390064B1 publication Critical patent/EP3390064B1/en
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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
    • B42D25/20—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
    • 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
    • B42D25/382—Special inks absorbing or reflecting infrared light
    • 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
    • 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
    • G07D7/06—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 wave or particle radiation
    • G07D7/12—Visible light, infrared or ultraviolet radiation
    • 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
    • G07D7/06—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 wave or particle radiation
    • G07D7/12—Visible light, infrared or ultraviolet radiation
    • G07D7/1205—Testing spectral properties
    • 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
    • G07D7/06—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 wave or particle radiation
    • G07D7/12—Visible light, infrared or ultraviolet radiation
    • G07D7/128—Viewing devices

Definitions

  • the present invention relates to a security element. It also concerns a document-value that includes at least one such element.
  • the present invention applies more particularly to a security element for a document-value such as, for example, a fiduciary document or similar.
  • fiduciary document means all documents such as banknotes, checks, bank cards or other media used to transmit a sum of money.
  • Similar document is understood to mean all documents issued by a State administration to prove the identity of a person, or of his rights to drive a vehicle, such as an identity card. , a passport or a driver's license.
  • This expression also refers to any type of document used to authenticate an object of value, such as, for example, a label to put on a garment.
  • a label to put on a garment We also hear any document used to authenticate the payment of a tax, such as tax stamps.
  • the present invention relates to a so-called second level security element, that is to say whose authentication requires a tool, for example an ultraviolet lamp, namely a commonly used tool and whose use is generally understood by the general public.
  • a tool for example an ultraviolet lamp, namely a commonly used tool and whose use is generally understood by the general public.
  • EP1567358 which describes a security device comprising at least two material-containing regions in which the two or more regions have substantially the same visible color in first observation conditions comprising visible light and different colors visible under second observation conditions which are a combination of visible light and substantially any UV wavelength light in the range of 235 to 380 nm.
  • the pattern is invisible normally but becomes visible on both sides if it is illuminated with UV from the side of the window. It remains invisible when illuminated on the side of the UV blocking layer.
  • WO 2014 177375 it is a security element composed of at least three layers each comprising a different material, the first, second and third materials of which are capable of interacting with a first, second and third electromagnetic radiation, the all composing an animated pattern by sequential illumination capable of emitting precisely separately in each of the individual radiations exciting one of the particular materials.
  • UV reactive inks are also more conventionally known which, under the action of a lamp with wavelengths less than 400 nm, emit a luminescent signal in the visible range (400-780 nm). These inks are a common example of second-level security.
  • Some pigments or ink dyes are also known to absorb at specific wavelengths. They require a lamp emitting on the chosen wavelength.
  • the pigments or the luminescent dyes of these inks have the main defect of absorbing ultraviolet radiation over broad spectra with higher or lower intensities.
  • ultraviolet lamps composed of fluorescent tubes emit on broadband spectra. This facilitates the work of counterfeiters who, with standard ultraviolet lamps, can visualize areas designed for second-level fluorescence color authentication. They can therefore falsify documents using commercial type inks as mentioned above.
  • luminescent materials whose absorption peak is targeted to a narrower band, as well as ultraviolet illuminants composed of LEDs (Light Emitting Device), which emit only on a spectral band tightened around a length accurate waveforms and also offer increased technical possibilities compared to vacuum tubes usually called neon, in terms of power consumption, ignition / extinction cycles etc.
  • LEDs Light Emitting Device
  • This feature allows to limit the action of counterfeiters, because it requires specific equipment.
  • this equipment remains affordable, thanks in particular to the rise of LEDs which also combine the advantage of a small footprint, allowing the manufacture of miniaturized devices.
  • anti-stokes luminescence materials which, under the action of a laser calibrated at the defined wavelength, emit in the visible.
  • wavelength is meant a wavelength greater than 780 nm, and more particularly a wavelength at 980 nm.
  • Such a security element is by nature difficult to achieve, and requires specific equipment to identify it.
  • the present invention provides a security element which comprises a support on which is present at least one print.
  • This element includes a first impression invisible to visible light, but revealed under a first range of wavelengths outside the spectrum of visible light, and a second impression invisible to visible light, but revealed in a second range of wavelengths outside the spectrum of visible light. Said first and second impressions extend into partially overlapping regions, thus constituting at least one overlap area.
  • This element includes hidden information which is constituted by said at least one a cover area, hidden information which is revealed under stroboscopic lighting alternating illumination under two ranges of wavelengths which respectively correspond to said first and second ranges of wavelengths.
  • these prints are made using of inks, for example made in the line, with guilloches, in the form of a numismatic background, etc.
  • the prints are made using means such as inks that are invisible to visible light and to the naked eye, but revealed in ranges of wavelength. outside the spectrum of visible light.
  • these prints are made with an ink reacting for example at a wavelength in the ultraviolet range or else using an ink reacting at a wavelength in the infrared range.
  • the two prints emit in the visible with a defined hue (identical according to the two prints or different) when exposed to the precise absorption wavelength defined by the luminescent material itself.
  • the range of wavelengths used will be less than 400 nm, and in particular with absorption peaks centered around 365 nm, 312 nm and 254 nm.
  • one is in a wavelength range greater than 780 nm and in particular with an absorption peak centered at 980 nm.
  • impression referenced 2 On the front face 10 of this note is present an impression referenced 2 and has two zones referenced A and B.
  • the printing 2 has the shape of a square which continues with a point on one of its sides.
  • Zone A has a diamond-shaped outline, while Zone B is the remaining portion.
  • zone A' is in register with the zone A of the first printing 2, so that overlap completely, and has the same shape and dimensions as zone A.
  • zone C is located on the right side of zone A ', and is opposite zone B. Zone C could have, in a variant not described, a different shape and not symmetrical with that of zone B.
  • the first impression 2 is made using a material invisible to visible light but revealed in a first wavelength range ⁇ 1 outside the spectrum of visible light.
  • the second impression 3 it is produced by means of a second ink invisible to visible light and revealed under a second wavelength range outside the spectrum of visible light, this second wavelength range ⁇ 2 being different and outside the first range of wavelengths.
  • hidden information means information that is not readily discernible but under specific observation conditions, which information is recognized as such by the observer. for example, because it intrinsically makes sense to him.
  • the second printing is performed, not on the same front face 10 but on the reverse side 11, so that the areas A and A 'are in register.
  • Figures 9 and 10 are shown three different embodiments of impressions 2 and 3, each being in the form of a parallel line of lines, but with lines of the printing 2, oriented at 90 ° to those of the printing 3 .
  • this hidden information IC is constituted respectively by the acronym of the pound sterling, the sign of the dollar, and the number 5.
  • each impression can all be made on the same face of the security element.
  • one or two of them may be affixed to a second face of the security element.
  • each impression is made using a material whose revelation wavelength is different from the other two.
  • an impression for two of these layers is revealed with light of the same wavelength. This is also the case for two layers only if these two layers are on opposite sides.
  • each of the prints 2 and 3 is strictly identical and each print has a perfect overlap area A and A 'constituting the area 4.
  • the density of lines or points of this print is defined in such a way that the density of A, namely dA, is equal to the density of B, namely, dB.
  • the density of lines or points of this layer 3 is defined in such a way that this density relative to the area A '(ie dA ') is equal to the density of the area C (ie dC).
  • an impression 2 applied to the front face 10 which is formed of a set of distinct points.
  • the impression 2 is seen in section at the figure 25 .
  • the hidden information IC is materialized by a dashed outline for clarity on the figure but is indistinguishable in reality.
  • the Figures 27 and 28 show a second print 3 also consisting of dots distinct from each other printed so that there is an overlap of some of these points with those of the printing 2.
  • the printing 3 can be performed either on the front side 10 on the reverse side 11.
  • the hidden information IC is materialized by a dashed outline for clarity on the figure but is indistinguishable in reality.
  • Figures 33 and 34 are shown other forms of printing 2 and 3 that are observed to simulate a stereoscopic binocular vision of a subject S in a scene D, as would an observer in real life.
  • the subject S is in the center and represents a seated person, drawn with an outline.
  • the decor D or background, also drawn line, is made up of steps at the bottom and parts of walls at the top.
  • the two images related to the decor are viewed from slightly different angles.
  • the hidden information IC is the relief of the central subject generated by the interpretation of the brain of an observer of the images observed thanks to the stroboscopic effect when the frequency of alternation of the illuminations makes it possible to erase any relative movement of the images. images between them and thus generate the stereoscopic effect.
  • dA is the density of the central subject of the printing 2 under the wavelength ⁇ 1 and dA that of the subject of the printing 3 under the wavelength ⁇ 2
  • the sum of the density dB of the decoration of the printing 2 under the wavelength ⁇ 1 with the density dC of the same decoration of the printing 3 under the wavelength ⁇ 2 is greater than dB and dC considered in isolation.
  • FIG. 35 and 36 is shown by way of example a device 5 which reveals the hidden information IC within a security element as described above.
  • this device here has the form of a housing 5 with a lower portion 50 and an upper portion 51, which has a 52 observation window through.
  • the lower part and the upper part are separated by an opening or slot 53 formed at least partially in the casing 5 and in which a flat document-value can be placed on which the security element to be revealed can be placed to submit it to authentication according to the invention.
  • the housing 5 encloses light sources of wavelengths ⁇ 1 and ⁇ 2 or more if necessary. These light sources are referenced 6 and 7.
  • These light sources are arranged and connected to an electronic card, itself provided with an on / off button 80, with a battery, for example of the Li-ion type, provided with a USB port 82.
  • a battery for example of the Li-ion type, provided with a USB port 82.
  • other power modes can be considered as the sector or a standard non-rechargeable battery, etc.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Finance (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Printing Methods (AREA)
  • Credit Cards Or The Like (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)

Description

DOMAINE DE L'INVENTIONFIELD OF THE INVENTION

La présente invention est relative à un élément de sécurité. Elle concerne également un document-valeur qui comporte au moins un tel élément.The present invention relates to a security element. It also concerns a document-value that includes at least one such element.

ARRIERE PLAN TECHNOLOGIQUE DE L'INVENTIONBACKGROUND OF THE INVENTION

La présente invention s'applique plus particulièrement à un élément de sécurité pour un document-valeur tel que, par exemple, un document fiduciaire ou assimilé.The present invention applies more particularly to a security element for a document-value such as, for example, a fiduciary document or similar.

Par l'expression "document fiduciaire", on entend tous les documents tels que des billets de banque, des chèques, des cartes bancaires ou autres supports servant à transmettre une somme d'argent.The term "fiduciary document" means all documents such as banknotes, checks, bank cards or other media used to transmit a sum of money.

Par l'expression "document assimilé", on entend tous les documents émis par une administration de l'Etat pour attester de l'identité d'une personne, ou de ses droits à conduire un véhicule, tels qu'une carte d'identité, un passeport ou un permis de conduire.The term "assimilated document" is understood to mean all documents issued by a State administration to prove the identity of a person, or of his rights to drive a vehicle, such as an identity card. , a passport or a driver's license.

On entend également par cette expression tout type de document qui sert à authentifier un objet de valeur, tel que, par exemple, une étiquette à poser sur un vêtement. On entend également tout document servant à authentifier le paiement d'une taxe, telle que les vignettes fiscales.This expression also refers to any type of document used to authenticate an object of value, such as, for example, a label to put on a garment. We also hear any document used to authenticate the payment of a tax, such as tax stamps.

Dans un tel domaine, et plus particulièrement pour les billets de banque, il est connu d'y apposer un ou plusieurs éléments de sécurité de natures variées, pour protéger ces documents d'une possible fabrication frauduleuse.In such a field, and more particularly for banknotes, it is known to affix one or more security elements of various natures, to protect these documents from possible fraudulent manufacture.

Ainsi, il existe différents types d'éléments de sécurité répondant à une classification par niveau et la présente invention se rapporte à un élément de sécurité dit de second niveau, c'est-à-dire dont l'authentification nécessite un outil, par exemple une lampe à rayons ultraviolets, à savoir un outil communément répandu et dont l'usage est globalement compris du grand public.Thus, there are different types of security elements responding to a classification by level and the present invention relates to a so-called second level security element, that is to say whose authentication requires a tool, for example an ultraviolet lamp, namely a commonly used tool and whose use is generally understood by the general public.

Il est connu de l'homme du métier le document EP1567358 qui décrit un dispositif de sécurité comprenant au moins deux régions contenant des matériaux dans lequel les deux régions ou plus présentent sensiblement la même couleur visible dans des premières conditions d'observation comprenant de la lumière visible et différentes couleurs visibles dans des secondes conditions d'observation qui sont une combinaison de lumière visible et d'une lumière de longueur d'onde UV sensiblement quelconque dans la plage de 235 à 380 nm.It is known to those skilled in the art the document EP1567358 which describes a security device comprising at least two material-containing regions in which the two or more regions have substantially the same visible color in first observation conditions comprising visible light and different colors visible under second observation conditions which are a combination of visible light and substantially any UV wavelength light in the range of 235 to 380 nm.

Si l'élément de sécurité est simple à mettre en oeuvre, il est toutefois menacé par la mise à disposition croissante auprès du grand public de solutions licites d'encre pour impression par jet d'encre ou de "toners" (encres en poudre) fluorescents (dans la gamme décrite ci-dessus, c'est-à-dire 235 à 380 nm), voire de solutions illicites ayant recours à des matériaux vendus par des sites hébergés sur le "Darknet" par exemple.If the security element is simple to implement, it is however threatened by the increasing availability to the general public of licit solutions of ink for inkjet printing or "toners" (inks powder) fluorescents (in the range described above, that is to say 235 to 380 nm), or even illegal solutions using materials sold by sites hosted on the "Darknet" for example.

Dans le document EP1719637 , il est question, pour renforcer les sécurités à base de matériaux fluorescents, d'utiliser une fenêtre transparente s'étendant à travers le document considéré, une couche transparente de blocage des rayons UV dans la région définie par la fenêtre transparente et un premier motif d'encre fluorescente imprimé entre la couche bloquant les UV et la fenêtre transparente.In the document EP1719637 , it is question, to reinforce the safety based on fluorescent materials, to use a transparent window extending through the document in question, a transparent UV blocking layer in the region defined by the transparent window and a first pattern fluorescent ink printed between the UV blocking layer and the transparent window.

Ainsi, le motif est invisible normalement mais devient visible des deux côtés s'il est illuminé avec des UV provenant du côté de la fenêtre. Il demeure invisible lorsqu'il est illuminé du côté de la couche bloquante aux UV.Thus, the pattern is invisible normally but becomes visible on both sides if it is illuminated with UV from the side of the window. It remains invisible when illuminated on the side of the UV blocking layer.

Bien entendu, avec une combinaison d'encres fluorescentes de couleurs différentes idéalement disposées de part et d'autres de la couche bloquante aux UV, il est possible d'obtenir des effets complexes qui rendent la contrefaçon plus compliquée.Of course, with a combination of fluorescent inks of different colors ideally arranged on both sides of the UV blocking layer, it is possible to obtain complex effects that make counterfeiting more complicated.

Mais l'inconvénient de cette solution est qu'il faut intégrer une fenêtre transparente dans un document en papier, ou adopter un support polymérique et rajouter des matériaux pour former une couche bloquant les UV. Ceci a forcément un impact sur la complexité de fabrication des supports et leur coût.But the disadvantage of this solution is that it is necessary to integrate a transparent window into a paper document, or to adopt a polymeric support and add materials to form a UV blocking layer. This inevitably has an impact on the manufacturing complexity of the media and their cost.

Dans le document WO 2014 177375 , il est question d'un élément de sécurité composé d'au moins trois couches comprenant chacune un matériau différent, dont le premier, le deuxième et le troisième matériaux sont capables d'interagir réciproquement avec un premier, deuxième et troisième rayonnements électromagnétiques, le tout composant un motif animé grâce à une illumination séquentielle capable d'émettre précisément de manière séparée dans chacun des rayonnements individuels excitant un des matériaux en particulier.In the document WO 2014 177375 it is a security element composed of at least three layers each comprising a different material, the first, second and third materials of which are capable of interacting with a first, second and third electromagnetic radiation, the all composing an animated pattern by sequential illumination capable of emitting precisely separately in each of the individual radiations exciting one of the particular materials.

On retrouve ici le principe du cinématographe avec un motif qui va sembler s'animer lorsque la série d'illuminants va s'allumer. On perçoit vite les limitations d'un tel système pour des raisons économiques où le nombre d'images du motif en action permettant la fluidité du mouvement va être maintenu très bas pour diminuer l'inflation du nombre d'encres à imprimer et, concomitamment, le nombre d'illuminants différents dans le dispositif servant à authentifier la sécurité.Here we find the principle of the cinematograph with a pattern that will seem to come alive when the series of illuminants will light. One quickly perceives the limitations of such a system for economic reasons where the number of images of the motive in action allowing the fluidity of the movement will be kept very low to decrease the inflation of the number of inks to print and, concomitantly, the number of different illuminants in the device used to authenticate the security.

On connait aussi plus classiquement des encres réactives aux rayons ultraviolets (UV) qui, sous l'action d'une lampe à longueurs d'ondes inférieures à 400 nm, émettent un signal luminescent dans le domaine visible (400-780 nm). Ces encres constituent un exemple répandu de sécurité de second niveau.Ultraviolet (UV) reactive inks are also more conventionally known which, under the action of a lamp with wavelengths less than 400 nm, emit a luminescent signal in the visible range (400-780 nm). These inks are a common example of second-level security.

Certains pigments ou colorants d'encres sont par ailleurs connus pour absorber à des longueurs d'ondes précises. Ils nécessitent une lampe émettant sur la longueur d'onde choisie.Some pigments or ink dyes are also known to absorb at specific wavelengths. They require a lamp emitting on the chosen wavelength.

Par longueur d'onde choisie, il est connu de retrouver les longueurs d'onde 365 nm, 312 nm et 254 nm.By wavelength chosen, it is known to recover the wavelengths 365 nm, 312 nm and 254 nm.

Toutefois, les pigments ou les colorants luminescents de ces encres ont pour principal défaut d'absorber les rayonnements ultraviolets sur des spectres larges, avec des intensités plus ou moins fortes.However, the pigments or the luminescent dyes of these inks have the main defect of absorbing ultraviolet radiation over broad spectra with higher or lower intensities.

De plus, les lampes à ultraviolet composées de tubes fluorescents émettent sur des spectres à bandes larges. Ceci facilite le travail des contrefacteurs qui, avec des lampes à ultraviolet standards, peuvent visualiser les zones conçues pour une authentification des couleurs de fluorescence de second niveau. Ils peuvent donc falsifier les documents à l'aide d'encres de type commercial comme évoqué ci-avant.In addition, ultraviolet lamps composed of fluorescent tubes emit on broadband spectra. This facilitates the work of counterfeiters who, with standard ultraviolet lamps, can visualize areas designed for second-level fluorescence color authentication. They can therefore falsify documents using commercial type inks as mentioned above.

Toutefois, il existe des matériaux luminescents dont le pic d'absorption est ciblé sur une bande plus étroite, ainsi que des illuminants ultraviolets composés de LED (Light Emitting Device), qui n'émettent que sur une bande spectrale resserrée autour d'une longueur d'onde précise et qui offrent également des possibilités techniques accrues comparativement à des tubes sous vides usuellement appelés néons, en termes de consommation électrique, de cycles d'allumage/extinction etc.However, there are luminescent materials whose absorption peak is targeted to a narrower band, as well as ultraviolet illuminants composed of LEDs (Light Emitting Device), which emit only on a spectral band tightened around a length accurate waveforms and also offer increased technical possibilities compared to vacuum tubes usually called neon, in terms of power consumption, ignition / extinction cycles etc.

Cette particularité permet de limiter l'action des contrefacteurs, car elle nécessite un équipement spécifique. Cependant, ce matériel reste d'un coût abordable, grâce notamment à l'essor des LED qui conjuguent également l'avantage d'un faible encombrement, permettant la fabrication de dispositifs miniaturisés.This feature allows to limit the action of counterfeiters, because it requires specific equipment. However, this equipment remains affordable, thanks in particular to the rise of LEDs which also combine the advantage of a small footprint, allowing the manufacture of miniaturized devices.

On connaît d'autre part des matériaux à luminescence dite "anti-stokes" qui, sous l'action d'un laser calibré à la longueur d'onde définie, émettent dans le visible.Also known so-called "anti-stokes" luminescence materials which, under the action of a laser calibrated at the defined wavelength, emit in the visible.

Par longueur d'onde définie, on entend une longueur d'onde supérieure à 780 nm, et plus particulièrement une longueur d'onde à 980 nm.By defined wavelength is meant a wavelength greater than 780 nm, and more particularly a wavelength at 980 nm.

Un tel élément de sécurité est par nature difficile à réaliser, et nécessite un équipement spécifique pour l'identifier.Such a security element is by nature difficult to achieve, and requires specific equipment to identify it.

Encore un art antérieur est constitué par le document WO 2015/144646 qui divulgue certaines des caractéristiques du préambule de la revendication 1 de la présente demande. Dans ce document, il est proposé de révéler une première image reconnaissable en tant que telle, sous un éclairage particulier (ultraviolets courts), puis une seconde image reconnaissable en tant que telle, sous un autre éclairage particulier (ultraviolet longs) et ceci grâce à une couche filtrante des UV courts pour obtenir un basculement net et franc entre les deux images quand on passe d'un éclairage à l'autre.Another prior art is the document WO 2015/144646 which discloses some of the features of the preamble of claim 1 of the present application. In this document, it is proposed to reveal a first recognizable image as such, under a particular illumination (short ultraviolet), then a second recognizable image as such, under another particular lighting (ultraviolet long) and this thanks to a filter layer of short UV to get a clear and frank switch between the two images when switching from one lighting to another.

Il existe donc un besoin avéré pour fournir des éléments de sécurité non visibles à l'oeil nu et à la lumière visible, dont la complexité ne se situe pas dans les matériaux eux-mêmes (pigments, encres ou supports impactant les coûts de fabrication), mais dans l'agencement des motifs imprimés et dans l'utilisation de dispositifs d'authentification économiques, rendant ainsi toute tentative de reproduction vaine.There is therefore a definite need to provide security elements that are not visible to the naked eye and visible light, the complexity of which is not in the materials themselves (pigments, inks or substrates impacting the manufacturing costs). but in the arrangement of the printed patterns and in the use of economic authentication devices, thus rendering any attempt at reproduction vain.

RESUME DE L'INVENTIONSUMMARY OF THE INVENTION

C'est dans cette optique que la présente invention propose un élément de sécurité qui comprend un support sur lequel est présente au moins une impression. Cet élément comprend une première impression invisible à la lumière visible, mais révélée sous une première gamme de longueurs d'onde en dehors du spectre de la lumière visible, ainsi qu'une deuxième impression invisible à la lumière visible, mais révélée sous une deuxième gamme de longueurs d'onde en dehors du spectre de la lumière visible. Lesdites première et deuxième impressions s'étendent dans des régions qui se recouvrent partiellement, constituant ainsi au moins une zone de recouvrement. Cet élément comporte une information cachée qui est constituée par ladite au moins une zone de recouvrement, information cachée qui est révélée sous un éclairage stroboscopique alternant des éclairages sous deux gammes de longueurs d'onde qui correspondent respectivement auxdites première et deuxième gammes de longueurs d'onde.It is in this context that the present invention provides a security element which comprises a support on which is present at least one print. This element includes a first impression invisible to visible light, but revealed under a first range of wavelengths outside the spectrum of visible light, and a second impression invisible to visible light, but revealed in a second range of wavelengths outside the spectrum of visible light. Said first and second impressions extend into partially overlapping regions, thus constituting at least one overlap area. This element includes hidden information which is constituted by said at least one a cover area, hidden information which is revealed under stroboscopic lighting alternating illumination under two ranges of wavelengths which respectively correspond to said first and second ranges of wavelengths.

Selon d'autres caractéristiques non limitatives et avantageuses de l'invention :

  • ladite deuxième gamme de longueur d'onde est différente et en dehors de ladite première gamme de longueur d'onde.
  • l'élément comporte au moins une autre impression invisible à la lumière visible, mais révélée sous une gamme de longueurs d'onde en dehors du spectre de la lumière visible, cette gamme de longueur d'onde étant différente et en dehors des autres gammes de longueur d'onde, que cette au moins une autre impression présente, conjointement avec les autres impressions, au moins une zone de recouvrement mutuel, et que ladite au moins une zone de recouvrement mutuel constitue au moins une information cachée qui est révélée sous un éclairage stroboscopique alternant des éclairages sous des gammes de longueurs d'onde qui correspondent respectivement auxdites première, deuxième et autre gammes de longueurs d'onde ;
  • ladite information cachée est une image, un chiffre ou un nombre, un texte, un code, une impression de relief générée par le cerveau d'un observateur ou une combinaison de ceux-ci ;
  • toutes les impressions sont présentes sur une même face dudit support ;
  • au moins une desdites impressions est présente sur une face dudit support, tandis qu'au moins une deuxième impression est présente sur la face opposée ;
  • ladite première et/ou la seconde impression(s) est/sont continue(s), c'est-à-dire constitue(nt) un "à plat" ;
  • ladite première et/ou la seconde impression(s) est/sont discontinue(s), c'est-à-dire est (sont) constituée(s) d'au moins deux régions distinctes et séparées qui constituent ensemble une trame ;
  • deux impressions sont discontinues et constituées de plusieurs régions distinctes et séparées, et sous illumination stroboscopique, la densité de couverture du support par lesdites impressions dans ladite au moins une zone de recouvrement est sensiblement inférieure, idéalement de moitié à la densité de couverture du support par lesdites impressions, en dehors de la zone de recouvrement ; et
  • les deux impressions sont discontinues et constituées de plusieurs régions distinctes et séparées, et sous illumination stroboscopique, la densité de couverture du support par lesdites impressions dans ladite au moins une zone de recouvrement est sensiblement supérieure, idéalement le double de la densité de couverture du support par lesdites impressions, en dehors de la zone de recouvrement.
According to other nonlimiting and advantageous features of the invention:
  • said second wavelength range is different and outside said first wavelength range.
  • the element has at least one other impression invisible to visible light, but revealed in a range of wavelengths outside the spectrum of visible light, this wavelength range being different and outside the other ranges of wavelength, that this at least one other printing has, together with the other prints, at least one overlapping area, and that said at least one overlapping area constitutes at least one hidden information that is revealed under a lighting stroboscopic alternating lightings in wavelength ranges which correspond respectively to said first, second and other ranges of wavelengths;
  • said hidden information is an image, a number or a number, a text, a code, a relief impression generated by the brain of an observer or a combination thereof;
  • all the impressions are present on the same face of said support;
  • at least one of said impressions is present on one side of said support, while at least one second impression is present on the opposite face;
  • said first and / or second printing (s) is / are continuous (s), ie constitutes (s) a "flat";
  • said first and / or second printing (s) is / are discontinuous, that is, is (are) constituted (s) of at least two distinct and separate regions which together constitute a frame;
  • two prints are discontinuous and consist of several distinct and separate regions, and under stroboscopic illumination, the density of coverage of the medium by said impressions in said at least one overlap zone is substantially smaller, ideally half the density of coverage of the support by said impressions, outside the recovery zone; and
  • the two impressions are discontinuous and consist of several distinct and separate regions, and under stroboscopic illumination, the coverage density of the support by said impressions in said at least one overlap area is substantially greater, ideally twice the coverage density of the support by said impressions, outside the overlap area.

BREVE DESCRIPTION DES DESSINSBRIEF DESCRIPTION OF THE DRAWINGS

D'autres caractéristiques et avantages de l'invention apparaîtront à la lecture de la description suivante de modes de réalisation préférés de l'invention. Cette description est faite en référence aux dessins annexés dans lesquels :

  • les figures 1 et 2 sont des vues de dessus d'un billet de banque qui intègre l'élément de sécurité selon l'invention, les figures 1 faisant apparaître seulement la première impression, tandis que la figure 2 montre seulement la deuxième impression ;
  • la figure 3 est un schéma en coupe longitudinale du billet des figures 1 et 2 montrant le recouvrement partiel des impressions ;
  • la figure 4 est un schéma montrant le principe mis en oeuvre pour révéler à un observateur l'information cachée au sein desdites impressions ;
  • les figures 5 et 6 sont des vues respectivement de dessus et de dessous d'un billet de banque qui intègre l'élément de sécurité selon l'invention, les impressions étant présentes chacune sur une grande face du billet ;
  • la figure 7 est une vue analogue à la figure 3 de ce deuxième mode de réalisation ;
  • la figure 8 est une vue analogue à la figure 4 ;
  • la figure 9 sont des vues de dessus de trois variantes de réalisation de premières impressions ;
  • la figure 10 est une vue de dessus de trois variantes de deuxième impressions qui se combinent à celles de la figure 9 lorsque l'illumination stroboscopique est activée;
  • la figure 11 est une vue de dessus des superpositions des impressions des figures 9 et 10 et de l'information cachée qu'elles révèlent ;
  • les figures 12 à 14 sont des vues de dessus de trois impressions, tandis que la figure 15 représente la superposition des impressions de ces trois figures, avec l'information cachée qu'elles révèlent ;
  • les figures 16 à 19 sont des vues analogues aux figures 1 à 4 respectivement, montrant une autre variante de ce mode de réalisation ;
  • les figures 20 à 23 sont des vues analogues aux figures 5 à 8 respectivement, montrant une autre variante de ce mode de réalisation ;
  • les figures 24 à 26 montrent respectivement une première impression vue de dessus, une coupe transversale de cette impression et de son support, ainsi qu'une seconde vue de dessus avec repérage de l'information cachée qu'elle dissimule par un contour pointillé pour plus de clarté mais indiscernable en réalité;
  • les figures 27 à 29 sont des vues analogues aux figures 24 à 26 relatives à la deuxième impression qui coopère avec la première impression des figures identifiées ci-dessus ;
  • la figure 30 est une vue de dessus de ce que voit un observateur lorsque les deux impressions des figures 24 et 27 sont soumises à un éclairage stroboscopique ;
  • les figures 31 et 32 sont des vues en coupe transversale du support qui a reçu ces deux impressions, selon qu'elles sont présentes ou non sur la même face du support ;
  • les figures 33 et 34 sont des vues de face de deux impressions qui, vues ensemble, procurent un effet stéréoscopique ;
  • enfin, les figures 35 et 36 sont respectivement des schémas simplifiés, en perspective et en coupe, d'un appareil qui peut être utilisé pour rendre visible l'information cachée qui fait partie intégrante de l'élément de sécurité.
Other characteristics and advantages of the invention will appear on reading the following description of preferred embodiments of the invention. This description is made with reference to the appended drawings in which:
  • the Figures 1 and 2 are top views of a bank note which incorporates the security element according to the invention, the figures 1 showing only the first impression, while the figure 2 only shows the second impression;
  • the figure 3 is a longitudinal sectional drawing of the Figures 1 and 2 showing the partial recovery of impressions;
  • the figure 4 is a diagram showing the principle implemented to reveal to an observer the information hidden within said impressions;
  • the Figures 5 and 6 are views respectively from above and from below of a bank note which incorporates the security element according to the invention, the impressions being each present on a large face of the note;
  • the figure 7 is a view similar to the figure 3 of this second embodiment;
  • the figure 8 is a view similar to the figure 4 ;
  • the figure 9 are top views of three embodiments of first impressions;
  • the figure 10 is a top view of three variants of second impressions that combine with those of the figure 9 when the strobe illumination is activated;
  • the figure 11 is a top view of the overlays of the prints of Figures 9 and 10 and the hidden information they reveal;
  • the Figures 12 to 14 are top views of three impressions, while the figure 15 represents the superimposition of the impressions of these three figures, with the hidden information they reveal;
  • the Figures 16 to 19 are views similar to Figures 1 to 4 respectively, showing another variant of this embodiment;
  • the Figures 20 to 23 are views similar to Figures 5 to 8 respectively, showing another variant of this embodiment;
  • the Figures 24 to 26 respectively show a first impression seen from above, a cross section of this impression and its support, and a second top view with location of the hidden information that it conceals with a dotted outline for clarity but indistinguishable in reality;
  • the Figures 27 to 29 are views similar to Figures 24 to 26 relating to the second printing which cooperates with the first impression of the figures identified above;
  • the figure 30 is a top view of what an observer sees when the two impressions of figures 24 and 27 are subject to stroboscopic lighting;
  • the Figures 31 and 32 are cross-sectional views of the medium that received these two impressions, depending on whether they are present on the same side of the support;
  • the Figures 33 and 34 are front views of two impressions that, when viewed together, provide a stereoscopic effect;
  • finally, Figures 35 and 36 are respectively simplified diagrams, in perspective and in section, of an apparatus that can be used to make visible the hidden information that is an integral part of the security element.

DESCRIPTION DETAILLEE DE L'INVENTIONDETAILED DESCRIPTION OF THE INVENTION

Dans l'ensemble de la description qui va suivre, il sera question d'un élément de sécurité qui comprend au moins deux impressions. Dans l'ensemble de ces modes de réalisation, ces impressions sont réalisées à l'aide d'encres, par exemple réalisées au trait, avec des guilloches, sous la forme d'un fond numismatique, etc.Throughout the following description, there will be a security element that includes at least two impressions. In all of these embodiments, these prints are made using of inks, for example made in the line, with guilloches, in the form of a numismatic background, etc.

Ces impressions sont réalisées en mettant en oeuvre des techniques d'impression diverses, telles que l'offset, la sérigraphie, la taille douce, la flexographie, la typographie, le jet d'encre ou le laser etc., sans que ces exemples soient limitatifs.These prints are made using various printing techniques, such as offset, screen printing, intaglio, flexography, letterpress, inkjet or laser etc., without these examples. limiting.

On s'intéressera plus particulièrement dans le cadre de l'invention à un élément de sécurité imprimé en offset. Toutefois, il s'agit là d'une simple illustration, le recours d'impressions en offset nécessitant d'avoir à disposition un moyen d'impression en registre, comme on le verra plus loin dans la description.In the context of the invention, a security element printed in offset will be of particular interest. However, this is a simple illustration, the use of offset printing requiring the availability of a register printing means, as will be seen later in the description.

Ainsi, il est entendu dans la présente demande qu'au moins deux impressions ou deux motifs lorsqu'ils sont en repérage (ou en registre) c'est-à-dire avec des positions relatives définies entre eux, quand ils sont bord à bord (ou contigus), quand ils sont à l'aplomb l'un de l'autre en totalité etc., sont des termes théoriques, valides sur les figures, les plans et les "layouts", mais qui souffrent en réalité d'écarts de placement minimes consécutifs à leur réalisation sur le document-valeur en question et aussi sur plusieurs documents-valeurs comparés entre eux. Il est par exemple usuel de constater des tolérances de placement entre deux groupes d'impression simultanés ou consécutifs de l'ordre de +/- 0,01 mm au mieux en offset, alors qu'il faut envisager des tolérances d'au moins +/- 0,2 mm au pire lorsque les impressions sont réalisées en deux passages distincts qui ne sont donc pas en ligne.Thus, it is understood in the present application that at least two impressions or two patterns when they are in registration (or register) that is to say with relative positions defined between them, when they are edge to edge (or contiguous), when they are in alignment with each other in full, etc., are theoretical terms, valid on the figures, the plans and the layouts, but which actually suffer from deviations minimum investment fees upon completion on the relevant document-value and also on several document-values compared with each other. It is, for example, customary to observe placement tolerances between two simultaneous or consecutive printing groups of the order of +/- 0.01 mm at best in offset, whereas tolerances of at least + / - 0.2 mm at worst when the prints are made in two separate passages that are not online.

Ainsi qu'il sera également détaillé ci-après, les impressions sont réalisées à l'aide de moyens tels que des encres qui sont invisibles à la lumière visible et à l'oeil nu, mais révélées sous des gammes de longueur d'onde en dehors du spectre de la lumière visible.As will also be detailed below, the prints are made using means such as inks that are invisible to visible light and to the naked eye, but revealed in ranges of wavelength. outside the spectrum of visible light.

Avantageusement, ces impressions sont réalisées avec une encre réagissant par exemple à une longueur d'onde dans le domaine ultraviolet ou alors en utilisant une encre réagissant à une longueur d'onde dans le domaine de l'infrarouge.Advantageously, these prints are made with an ink reacting for example at a wavelength in the ultraviolet range or else using an ink reacting at a wavelength in the infrared range.

Les deux impressions émettent dans le visible avec une teinte définie (identique suivant les deux impressions ou différente) lorsqu'elles sont exposées à la longueur d'onde d'absorption précise définie par le matériau luminescent lui-même.The two prints emit in the visible with a defined hue (identical according to the two prints or different) when exposed to the precise absorption wavelength defined by the luminescent material itself.

Lorsque l'on utilise une encre réagissant aux longueurs d'onde dans le domaine de l'ultraviolet, alors la gamme de longueurs d'onde utilisées sera inférieure à 400 nm, et notamment avec des pics d'absorption centrés autour de 365 nm, 312 nm et 254 nm.When using a wavelength responsive ink in the ultraviolet range, then the range of wavelengths used will be less than 400 nm, and in particular with absorption peaks centered around 365 nm, 312 nm and 254 nm.

Lorsque l'on utilise une encre réagissant aux longueurs d'onde dans le domaine de l'infrarouge, alors on se situe dans une gamme de longueurs d'onde supérieure à 780 nm et notamment avec un pic d'absorption centré à 980 nm.When using a wavelength-responsive ink in the infrared range, then one is in a wavelength range greater than 780 nm and in particular with an absorption peak centered at 980 nm.

Ainsi, en se référant aux figures 1 à 3 annexées, on a ici affaire à un billet de banque 1 dont les grandes faces opposées 10 et 11 sont revêtues de diverses impressions et de moyens de sécurité connus de l'homme de l'art et sur lesquels nous ne reviendrons pas plus avant.Thus, by referring to Figures 1 to 3 annexed, we are dealing here with a bank note 1 whose large faces opposite 10 and 11 are coated various impressions and security means known to those skilled in the art and on which we will not return further.

Sur la face recto 10 de ce billet est présente une impression référencée 2 et présente deux zones référencées A et B.On the front face 10 of this note is present an impression referenced 2 and has two zones referenced A and B.

Dans cet exemple de réalisation, l'impression 2 a la forme d'un carré qui se poursuit par une pointe sur l'un de ses côtés. La zone A a un contour en forme de losange, tandis que la zone B correspond à la partie restante.In this embodiment, the printing 2 has the shape of a square which continues with a point on one of its sides. Zone A has a diamond-shaped outline, while Zone B is the remaining portion.

En se référant maintenant à la figure 2, on a représenté, sur la même face recto 10 du billet, seulement une deuxième impression 3 comportant deux zones A' et C. La zone A' est en registre avec la zone A de la première impression 2, de sorte qu'elles se superposent complètement, et présente la même forme et les mêmes dimensions que la zone A. En revanche, la zone C se situe du côté droit de la zone A', et est opposée à la zone B. La zone C pourrait avoir, dans une variante non décrite, une forme différente et non symétrique de celle de la zone B.Referring now to the figure 2 , there is shown, on the same front face 10 of the banknote, only a second printing 3 having two zones A 'and C. The zone A' is in register with the zone A of the first printing 2, so that overlap completely, and has the same shape and dimensions as zone A. On the other hand, zone C is located on the right side of zone A ', and is opposite zone B. Zone C could have, in a variant not described, a different shape and not symmetrical with that of zone B.

Ainsi, quand on se réfère à la coupe de la figure 3, on constate que les impressions 2 et 3 se recouvrent partiellement pour constituer une zone de recouvrement 4 qui est constituée des zones A et A' superposées.So when we refer to the cut of the figure 3 it is found that the impressions 2 and 3 partially overlap to form a covering area 4 which consists of superimposed areas A and A '.

Comme indiqué plus haut, la première impression 2 est réalisée à l'aide d'un matériau invisible à la lumière visible mais révélée sous une première gamme de longueurs d'onde λ1 en dehors du spectre de la lumière visible. Quant à la deuxième impression 3, elle est réalisée au moyen d'une deuxième encre invisible à la lumière visible et révélée sous une deuxième gamme de longueurs d'onde en dehors du spectre de la lumière visible, cette deuxième gamme de longueurs d'onde λ2 étant différente et en dehors de la première gamme de longueurs d'onde.As indicated above, the first impression 2 is made using a material invisible to visible light but revealed in a first wavelength range λ 1 outside the spectrum of visible light. As for the second impression 3, it is produced by means of a second ink invisible to visible light and revealed under a second wavelength range outside the spectrum of visible light, this second wavelength range λ 2 being different and outside the first range of wavelengths.

Compte tenu de ces caractéristiques, on comprend que, si l'on illumine le billet au-dessus de sa face recto 10 en faisant usage d'une lumière de longueur d'onde λ1, seule l'impression 2 va être révélée.Given these characteristics, it is understood that, if the ticket is illuminated above its front face 10 by making use of a light of wavelength λ 1 , only the printing 2 will be revealed.

De même, si l'on illumine cette face uniquement avec une lumière de longueur d'onde λ2, seule l'impression 3 va être révélée. En revanche, et comme montré schématiquement à la figure 4, si l'on illumine alternativement la face 10 du billet avec des sources lumineuses de longueurs d'onde λ1 et λ2, en les alternant l'une par rapport à l'autre, avec une fréquence suffisante pour provoquer un effet stroboscopique, alors la persistance rétinienne qu'aura une personne observant la zone de recouvrement 4 des deux couches imprimées va laisser paraître (va révéler, c'est-à-dire rendre visible) une information cachée IC qui sera perçue et interprétée sans ambiguïté par rapport à la personne cherchant à authentifier le document, en l'occurrence le billet 1.Similarly, if one illuminates this face only with a light of wavelength λ 2 , only the printing 3 will be revealed. On the other hand, and as shown schematically in figure 4 if the face 10 of the bill is alternately illuminated with light sources of wavelengths λ 1 and λ 2 , alternating with each other, with a frequency sufficient to cause a stroboscopic effect, then the retinal persistence that a person observing the overlap zone 4 of the two printed layers will show (will reveal, that is to say make visible) a hidden information IC that will be perceived and interpreted without ambiguity with respect to the person seeking to authenticate the document, in this case ticket 1.

Dans l'ensemble de la présente demande, on entend par l'expression « information cachée », une information qui n'est pas discernable d'emblée mais dans des conditions d'observations spécifiques, information qui est reconnue comme telle par l'observateur, par exemple parce qu'elle a intrinsèquement un sens pour lui.Throughout the present application, the expression "hidden information" means information that is not readily discernible but under specific observation conditions, which information is recognized as such by the observer. for example, because it intrinsically makes sense to him.

Le mode de réalisation illustré aux figures 5 à 8 est très proche du précédent. En l'occurrence, sur la face recto 10 du billet 1, on a affaire à une première impression 2 en tout point identique à celle qui a été représentée à la figure 1.The embodiment illustrated in Figures 5 to 8 is very close to the previous one. In this case, on the front face 10 of the ticket 1, we are dealing with a first impression 2 in all respects identical to that which has been represented in the figure 1 .

En revanche, la deuxième impression est réalisée, non pas sur la même face recto 10 mais sur la face verso 11, de manière à ce que les zones A et A' soient en registre.On the other hand, the second printing is performed, not on the same front face 10 but on the reverse side 11, so that the areas A and A 'are in register.

C'est ce qui a été représenté à la figure 7 dans laquelle la zone de recouvrement des deux impressions 2 et 3 est toujours référencée 4.This is what was represented at the figure 7 in which the overlap zone of the two impressions 2 and 3 is always referenced 4.

Bien entendu, ceci présuppose que le support en lui-même ne soit pas absolument opaque et notamment à la couleur de luminescence émise au verso (observateur considéré au recto) lors de l'illumination par effet stroboscopique, mais ceci est le cas des papiers utilisés pour imprimer des documents-valeur.Of course, this presupposes that the support itself is not absolutely opaque and in particular the luminescence color emitted on the back (observer considered on the front) during illumination by stroboscopic effect, but this is the case of the papers used. to print value documents.

Il est également envisageable de procéder localement à la désopacification partielle ou totale (transparence) par un traitement chimique ou physique ou par une opération antérieure apte à générer cette propriété pour améliorer encore l'effet d'apparition de l'information cachée.It is also conceivable to carry out partial or total deopacification (transparency) locally by means of a chemical or physical treatment or by an earlier operation capable of generating this property in order to further improve the appearance effect of the hidden information.

De la même manière que précédemment, mais en ayant des sources lumineuses de longueurs d'onde λ1 et λ2 disposées de part et d'autre du billet, et en réalisant un éclairage sous effet stroboscopique, on va alors révéler l'information cachée IC par la superposition des deux impressions 2 et 3, au niveau de la zone 4. Cette information est alors visible par transvision, pour l'observateur placé d'un côté ou de l'autre.In the same manner as above, but having light sources of wavelengths λ 1 and λ 2 disposed on either side of the ticket, and by performing illumination under stroboscopic effect, we will then reveal the hidden information IC by the superposition of the two impressions 2 and 3, at the level of the zone 4. This information is then visible by transvision, for the observer placed on one side or the other.

Aux figures 9 et 10 sont représentées trois formes de réalisation différentes d'impressions 2 et 3, chacune étant sous la forme d'une trame de traits parallèles, mais avec des traits de l'impression 2, orientés à 90° par rapport à ceux de l'impression 3.the Figures 9 and 10 are shown three different embodiments of impressions 2 and 3, each being in the form of a parallel line of lines, but with lines of the printing 2, oriented at 90 ° to those of the printing 3 .

Lorsque l'on considère l'une ou l'autre de ces impressions, aucune image particulière n'est associée à ces impressions. Toutefois, lorsque l'on considère leur superposition grâce à la persistance rétinienne obtenue sous effet stoboscopique, alors des images cachées IC que l'observateur identifie tout de suite sont révélées (figure 11).When we consider one or the other of these impressions, no particular image is associated with these impressions. However, when one considers their superposition thanks to the retinal persistence obtained under stoboscopic effect, then hidden images IC that the observer identifies immediately are revealed ( figure 11 ).

En l'occurrence, de gauche à droite, ces informations cachées IC sont respectivement constituées par le sigle de la livre sterling, le signe du dollar, et le chiffre 5.In this case, from left to right, this hidden information IC is constituted respectively by the acronym of the pound sterling, the sign of the dollar, and the number 5.

Dans le mode de réalisation des figures 12 à 15, on a affaire non pas à deux impressions mais à trois.In the embodiment of Figures 12 to 15 we are not dealing with two impressions but three.

Ces impressions sont référencées 2, 2' et 2".These impressions are referenced 2, 2 'and 2 ".

Là encore, lorsque l'on considère chacune de ces impressions, aucune image particulière n'est associée à ces impressions. Toutefois, quand on considère leur superposition de la figure 15 révélée par un éclairage stroboscopique, on identifie rapidement l'information cachée constituée par le chiffre 5.Again, when considering each of these impressions, no particular image is associated with these impressions. However, when we consider their superposition of the figure 15 revealed by stroboscopic lighting, the hidden information consisting of the number 5 is quickly identified.

Ces trois impressions peuvent toutes être réalisées sur la même face de l'élément de sécurité. Toutefois, l'une ou deux d'entre elles peuvent être apposées sur une seconde face de l'élément de sécurité. De préférence, chaque impression est réalisée à l'aide d'un matériau dont la longueur d'onde de révélation est différente des deux autres. Toutefois, on peut envisager qu'une impression pour deux de ces couches soit révélée avec une lumière de même longueurs d'onde. C'est aussi le cas pour deux couches seulement si ces deux couches sont sur des faces opposées.These three prints can all be made on the same face of the security element. However, one or two of them may be affixed to a second face of the security element. Preferably, each impression is made using a material whose revelation wavelength is different from the other two. However, it is conceivable that an impression for two of these layers is revealed with light of the same wavelength. This is also the case for two layers only if these two layers are on opposite sides.

Aux figures 16 à 19, est représenté encore un mode de réalisation analogue à celui des figures 1 et 2, à savoir que les deux impressions 2 et 3 sont réalisées sur la même face recto du billet 1.the Figures 16 to 19 , there is shown another embodiment similar to that of Figures 1 and 2 , namely that the two prints 2 and 3 are made on the same front face of the ticket 1.

Toutefois, dans ce contexte, le contour global de chacune des impressions 2 et 3 est strictement identique et chaque impression comporte une zone de parfait recouvrement A et A' constituant la zone 4.However, in this context, the overall outline of each of the prints 2 and 3 is strictly identical and each print has a perfect overlap area A and A 'constituting the area 4.

De la même manière que pour le mode de réalisation des figures 1 et 2, en illuminant alternativement la face recto du billet à l'aide de lumières de longueurs d'onde λ1 et λ2, sous effet stroboscopique, on révèle alors l'information cachée qui occupe la zone A et A'.In the same way as for the embodiment of the Figures 1 and 2 , by alternately illuminating the front face of the note with wavelength lights λ 1 and λ 2 , under stroboscopic effect, the hidden information which occupies the area A and A 'is then revealed.

Quant au mode de réalisation des figures 20 et 21, il a pour élément commun avec le mode de réalisation qui vient d'être décrit le fait que les impressions 2 et 3 se superposent exactement, mais ceci sous la forme d'une impression 2 réalisée sur la face recto 10, et d'une impression 3 réalisée sur la face verso 11.As to the mode of realization of Figures 20 and 21 , it is common with the embodiment just described that the impressions 2 and 3 are superimposed exactly, but this in the form of an impression 2 made on the front face 10, and a print 3 made on the reverse side 11.

Sous la longueur d'onde λ1, et en considérant l'impression 2, la densité de lignes ou de points de cette impression est définie de telle manière que la densité de A, à savoir dA, est égale à la densité de B, à savoir dB. De même, en ce qui concerne l'impression 3 éclairée par une source de longueur d'onde λ2 la densité de lignes ou de points de cette couche 3 est définie de telle manière que cette densité relative à la zone A' (soit dA') est égale à la densité de la zone C (soit dC).Under the wavelength λ 1 , and considering the print 2, the density of lines or points of this print is defined in such a way that the density of A, namely dA, is equal to the density of B, namely, dB. Likewise, with regard to the printing 3 illuminated by a source of wavelength λ 2, the density of lines or points of this layer 3 is defined in such a way that this density relative to the area A '(ie dA ') is equal to the density of the area C (ie dC).

En illuminant l'ensemble séquentiellement à l'aide de sources d'illumination de longueurs d'onde λ1 et λ2 alors, trois options sont possibles pour les superpositions :
Ainsi, lorsque dA + dA' est supérieure à dB, et dA + dA' supérieure à dC, les zones B et C étant sans recouvrement, alors l'information cachée est reconstituée par partie. Dans le second cas où dA ou dA' est inférieur ou égal à dA + dA', laquelle est inférieure à dB + dC, les zones B et C se recouvrant au moins partiellement, alors l'information apparaît en négatif. Enfin, dans le troisième cas, c'est-à-dire quand dA + dA' est supérieure à dB + dC, elles-mêmes supérieures ou égales à dB ou dC, les zones B et C se recouvrant au moins partiellement, alors l'information apparaît en positif.By illuminating the assembly sequentially using wavelength illumination sources λ 1 and λ 2 , three options are possible for the overlays:
Thus, when dA + dA 'is greater than dB, and dA + dA' greater than dC, zones B and C being without overlap, then the hidden information is reconstituted by part. In the second case where dA or dA 'is less than or equal to dA + dA', which is less than dB + dC, the zones B and C overlapping at least partially, then the information appears in negative. Finally, in the third case, that is, when dA + dA 'is greater than dB + dC, themselves greater than or equal to dB or dC, the zones B and C overlapping at least partially, so that information appears positive.

A la figure 24 est représentée une impression 2 appliquée sur la face recto 10 qui est formée d'un ensemble de points distincts. L'impression 2 est vue en coupe à la figure 25. A la figure 26, l'information cachée IC est matérialisée par un contour pointillé pour plus de clarté sur la figure mais est indiscernable en réalité.To the figure 24 is shown an impression 2 applied to the front face 10 which is formed of a set of distinct points. The impression 2 is seen in section at the figure 25 . To the figure 26 , the hidden information IC is materialized by a dashed outline for clarity on the figure but is indistinguishable in reality.

Les figures 27 et 28 montrent une deuxième impression 3 également constituée de points distincts les uns des autres imprimés de telle manière qu'il y ait un recouvrement de certains de ces points avec ceux de l'impression 2. L'impression 3 peut être réalisée soit du côté recto 10 soit du côté verso 11. A la figure 29, l'information cachée IC est matérialisée par un contour pointillé pour plus de clarté sur la figure mais est indiscernable en réalité.The Figures 27 and 28 show a second print 3 also consisting of dots distinct from each other printed so that there is an overlap of some of these points with those of the printing 2. The printing 3 can be performed either on the front side 10 on the reverse side 11. At the figure 29 , the hidden information IC is materialized by a dashed outline for clarity on the figure but is indistinguishable in reality.

Ce faisant, en considérant les figures 30 à 32, que les impressions soient réalisées sur la même face 10 (figure 31) ou sur les faces opposées 10 et 11 (figure 32), alors l'information cachée IC constituée du nombre 50 est révélée du fait que, dans cette zone de recouvrement 4, la densité de points est inférieure sensiblement de moitié dans ce cas au reste de la surface des impressions 2 et 3 en recouvrement de l'élément de sécurité.In doing so, considering the Figures 30 to 32 , that the prints are made on the same side 10 ( figure 31 ) or on the opposite faces 10 and 11 ( figure 32 ), then the hidden information IC consisting of the number 50 is revealed because, in this overlap zone 4, the density of points is less than half in this case the rest of the surface of the impressions 2 and 3 in recovery of the security element.

Aux figures 33 et 34 sont représentées d'autres formes d'impression 2 et 3 qui sont observées pour simuler une vision binoculaire stéréoscopique d'un sujet S dans un décor D, comme le ferait un observateur dans la vie réelle.the Figures 33 and 34 are shown other forms of printing 2 and 3 that are observed to simulate a stereoscopic binocular vision of a subject S in a scene D, as would an observer in real life.

Dans ce cas, le sujet S est au centre et représente une personne assise, dessinée avec un contour. Le décor D ou arrière plan, aussi dessiné au trait, est lui constitué de marches en partie basse et de pans de murs en partie haute. Les deux images liées au décor sont considérées sous des angles légèrement différents.In this case, the subject S is in the center and represents a seated person, drawn with an outline. The decor D or background, also drawn line, is made up of steps at the bottom and parts of walls at the top. The two images related to the decor are viewed from slightly different angles.

Dans ce cas, l'information cachée IC est le relief du sujet central généré par l'interprétation du cerveau d'un observateur des images observées grâce à l'effet stroboscopique lorsque la fréquence d'alternance des illuminations permet de gommer tout mouvement relatif des images entre elles et donc de générer l'effet stéréoscopique . Ainsi dans ce cas, si dA est la densité du sujet central de l'impression 2 sous la longueur d'onde λ1 et dA' celle du sujet de l'impression 3 sous la longueur d'onde λ2, alors en superposition la somme dA plus dA' est égale à dA ou dA' (les sujets sont confondus). Par ailleurs, la somme de la densité dB du décor de l'impression 2 sous la longueur d'onde λ1 avec la densité dC du même décor de l'impression 3 sous la longueur d'onde λ2.est supérieure à dB et dC considérés isolément.In this case, the hidden information IC is the relief of the central subject generated by the interpretation of the brain of an observer of the images observed thanks to the stroboscopic effect when the frequency of alternation of the illuminations makes it possible to erase any relative movement of the images. images between them and thus generate the stereoscopic effect. Thus in this case, if dA is the density of the central subject of the printing 2 under the wavelength λ 1 and dA that of the subject of the printing 3 under the wavelength λ 2 , then in superposition the sum dA plus dA 'equals dA or dA' (subjects are confounded). Moreover, the sum of the density dB of the decoration of the printing 2 under the wavelength λ 1 with the density dC of the same decoration of the printing 3 under the wavelength λ 2 is greater than dB and dC considered in isolation.

Aux figures 35 et 36 est représenté à titre d'exemple un dispositif 5 qui permet de révéler l'information cachée IC au sein d'un élément de sécurité tel que décrit ci-dessus.the Figures 35 and 36 is shown by way of example a device 5 which reveals the hidden information IC within a security element as described above.

En l'occurrence, ce dispositif a ici la forme d'un boîtier 5 avec une partie inférieure 50 et une partie supérieure 51, qui présente une fenêtre d'observation 52 traversante. La partie inférieure et la partie supérieure sont séparées par une ouverture ou fente 53 ménagée au moins partiellement dans le boîtier 5 et dans laquelle on pourra glisser un document-valeur plat sur lequel l'élément de sécurité à révéler peut être placé pour le soumettre à l'authentification selon l'invention.In this case, this device here has the form of a housing 5 with a lower portion 50 and an upper portion 51, which has a 52 observation window through. The lower part and the upper part are separated by an opening or slot 53 formed at least partially in the casing 5 and in which a flat document-value can be placed on which the security element to be revealed can be placed to submit it to authentication according to the invention.

Bien entendu, le boîtier 5 renferme des sources lumineuses de longueurs d'onde λ1 et λ2 ou plus si besoin. Ces sources lumineuses sont référencées 6 et 7.Of course, the housing 5 encloses light sources of wavelengths λ 1 and λ 2 or more if necessary. These light sources are referenced 6 and 7.

Ces sources lumineuses, de type diodes, sont agencées et reliées à une carte électronique, elle-même pourvue d'un bouton de marche/arrêt 80, avec une batterie, par exemple de type Li-ion, pourvue d'un port USB 82. Bien entendu d'autres modes d'alimentation peuvent être considérés comme le secteur ou une batterie non rechargeable standard, etc.These light sources, of the diode type, are arranged and connected to an electronic card, itself provided with an on / off button 80, with a battery, for example of the Li-ion type, provided with a USB port 82. Of course other power modes can be considered as the sector or a standard non-rechargeable battery, etc.

Non exposée dans le présent document, une autre variante est le cas où les sources lumineuses sont situées du même côté lorsque les impressions 2 et 3 sont donc du même côté. La forme elle-même du boitier 5 peut alors changer. Il n'est pas absolument indispensable d'avoir une fente 53 pour insérer l'échantillon à authentifier. En effet, cette dernière n'est là que pour apporter une pénombre propice au discernement des couleurs des matériaux luminescents. En effet, si l'on procède à l'authentification dans un endroit déjà plongé dans la pénombre ou alors avec un cache amovible à l'endroit ciblé, ceci permettra d'obtenir le même résultat.Not shown in this document, another variant is the case where the light sources are located on the same side when the prints 2 and 3 are on the same side. The form itself of the box 5 can then change. It is not absolutely essential to have a slot 53 to insert the sample to be authenticated. Indeed, the latter is only there to provide a penumbra conducive to discerning colors of luminescent materials. Indeed, if one carries out the authentication in a place already plunged in the penumbra or then with a removable cache in the targeted place, this will obtain the same result.

Claims (10)

  1. A security element which comprises a support (1) on which is present at least one print (2; 2'; 2"; 3), which comprises a first print (2) invisible to visible light, but revealed under a first range of wavelengths (λ1) outside the spectrum of visible light, as well as a second print (3) invisible to visible light, but revealed under a second range of wavelengths (λ2) outside the spectrum of visible light, said first and second prints (2, 3) extending into regions which partially overlap, constituting at least one overlapping region (4),
    characterized in that it comprises a hidden information (IC) which is constituted by said at least one overlapping region (4), hidden information (IC) which can be revealed under stroboscopic lighting alternating lighting under two ranges of wavelengths which correspond respectively to said first and second ranges of wavelengths (λ1 and λ2).
  2. The security element according to claim 1, characterized in that said second range of wavelength (λ2) is different and outside said first range of wavelength (λ1).
  3. The security element according to claim 1 or 2, characterized in that it comprises at least one other print (2', 2") invisible to visible light, but revealed under a range of wavelengths outside the spectrum of visible light, this range of wavelength being different and outside the other ranges of wavelength (λ1 and λ2), that this at least one other print (2', 2") presents, jointly with the other prints (2, 3), at least one mutual overlapping region (4), and that said at least one mutual overlapping region (4) constitutes at least one item of hidden information (IC) which can be revealed under stroboscopic lighting alternating lighting in ranges of wavelengths corresponding respectively to said first, second and other ranges of wavelengths.
  4. The security element according to any one of claims 1 to 3, characterized in that said hidden information (IC) is an image, a figure or a number, a text, a code, a relief print generated by the brain of an observer or a combination of the latter.
  5. The security element according to any one of the preceding claims, characterized in that all the prints (2, 3; 2', 2") are present on the same face (10; 11) of said support (1).
  6. The security element according to any one of claims 1 to 4, characterized in that at least one of said prints (2; 3; 2'; 2") is present on a face (10) of said support (1), whereas at least one second print (2; 3; 2'; 2") is present on the opposite face (11).
  7. The security element according to any one of the preceding claims, characterized in that said first and/or the second print(s) (2; 3; 2'; 2") is/are continuous, that is, constitute(s) a "a plat".
  8. The security element according to any one of the preceding claims, characterized in that said first and/or the second print(s) (2; 3; 2'; 2") is/are discontinuous, that is, is (are) constituted by at least two distinct and separate regions which together constitute a grid.
  9. The security element according to claim 8 wherein the two prints (2, 3) are discontinuous and constituted by several distinct and separate regions, characterized in that under stroboscopic lighting, the coverage density of the support (1) by said prints (2, 3) in said at least one overlapping region (4) is substantially less, ideally half the coverage density of the support by said prints, outside the overlapping region (4).
  10. The security element according to claim 8 wherein the two prints (2, 3) are discontinuous and constituted by several distinct and separate regions, characterized in that under stroboscopic lighting, the coverage density of the support (1) by said prints (2, 3) in said at least one overlapping region (4) is substantially greater, ideally double the coverage density of the support by said prints, outside the overlapping region (4).
EP16810423.0A 2015-12-18 2016-12-19 Security element with hidden information Active EP3390064B1 (en)

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PL16810423T PL3390064T3 (en) 2015-12-18 2016-12-19 Security element with hidden information

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FR1562826A FR3045907B1 (en) 2015-12-18 2015-12-18 SECURITY ELEMENT HAVING HIDDEN INFORMATION, DOCUMENT-VALUE THAT INCLUDES IT AND DEVICE FOR VERIFYING THIS HIDDEN INFORMATION
PCT/EP2016/081694 WO2017103252A1 (en) 2015-12-18 2016-12-19 Security element comprising hidden information and valuable document comprising same

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CN108883651A (en) 2018-11-23
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ZA201803981B (en) 2019-04-24
ES2753152T3 (en) 2020-04-07
CA3008740A1 (en) 2017-06-22
AU2016369458A1 (en) 2018-07-12
FR3045907B1 (en) 2019-11-22
KR102637134B1 (en) 2024-02-16
CN108883651B (en) 2020-08-07
PL3390064T3 (en) 2020-03-31
AU2016369458B2 (en) 2021-01-14
EP3390064A1 (en) 2018-10-24
FR3045907A1 (en) 2017-06-23
KR20180113994A (en) 2018-10-17

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