EP1578617A1 - Waveguide safety device - Google Patents

Waveguide safety device

Info

Publication number
EP1578617A1
EP1578617A1 EP03815118A EP03815118A EP1578617A1 EP 1578617 A1 EP1578617 A1 EP 1578617A1 EP 03815118 A EP03815118 A EP 03815118A EP 03815118 A EP03815118 A EP 03815118A EP 1578617 A1 EP1578617 A1 EP 1578617A1
Authority
EP
European Patent Office
Prior art keywords
layer
waveguide
safety device
refractive index
pattern
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.)
Ceased
Application number
EP03815118A
Other languages
German (de)
French (fr)
Inventor
Thierry Dumery
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.)
Banque de France
Original Assignee
Banque de France
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Banque de France filed Critical Banque de France
Publication of EP1578617A1 publication Critical patent/EP1578617A1/en
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • G07D7/20—Testing patterns thereon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
    • B41M3/14—Security printing
    • B41M3/144—Security printing using fluorescent, luminescent or iridescent effects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
    • B41M3/06—Veined printings; Fluorescent printings; Stereoscopic images; Imitated patterns, e.g. tissues, textiles
    • 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
    • B42D25/324—Reliefs
    • 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
    • B42D25/328—Diffraction gratings; Holograms
    • 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
    • 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
    • G07D7/181—Testing mechanical properties or condition, e.g. wear or tear

Definitions

  • the present invention relates to a security device which can be affixed to or incorporated into an object in order to ensure first level or second level security against fraudulent reproduction of the object in question.
  • the security device may be intended to provide first level security, that is to say be visually identifiable without the use of a tool, or second level security, that is to say by using an identification tool such as an ultraviolet lamp or an infrared sensor.
  • an identification tool such as an ultraviolet lamp or an infrared sensor.
  • An object of the invention is to propose a security element which can be easily memorized and analyzed at least during a first level control.
  • a security device comprising a layer of transparent material having an index of refraction and a thickness suitable for forming a waveguide and containing at least one photoluminescent product, one of the faces of this waveguide layer comprising a light extraction pattern locally interrupting the waveguide effect.
  • the light which penetrates into the layer in waveguide excites the photoluminescent product from which the luminescent emission cannot escape of the waveguide layer only by the light extraction pattern and is therefore perceived by an observer according to the sign formed by the outline of this pattern.
  • a photoluminescent product emitting in the visible range it is possible to provide first level control by observing not only the outline of the light extraction pattern, but the color of this pattern.
  • the security device comprises at least one transparent layer in contact with one face of the waveguide layer and having a refractive index lower than the refractive index of the guide layer wave.
  • the waveguide effect is enhanced so that a stronger intensity of the light emitted through the light extraction pattern is obtained, and further extraction of light by soiling which is avoided would be applied to the external surface of the security device when the object carrying this security device is used, these soiling generally having a refractive index suitable for extracting the light at the location of the soiling.
  • the light extraction pattern is produced either in the form of a relief pattern or in the form of a pattern produced by means of a transparent product having a higher refractive index. the refractive index of the waveguide layer.
  • the waveguide layer comprises at least one zone comprising a first photoluminescent product and at least one adjacent zone comprising a second photoluminescent product forming a light cascade with the first photoluminescent product.
  • a color is thus obtained at the level of the light extraction pattern which does not correspond to any natural color of photoluminescent product so that the difficulty of reproducing the safety device is increased.
  • FIG. 1 is a partial perspective view of a bank note equipped with a security device according to the invention
  • - Figure 2 is a very enlarged sectional view of a first embodiment of the security device according to the invention before its application on a banknote
  • - Figure 3 is a sectional view similar to that of Figure 2 of a second embodiment of the security device according to the invention
  • FIG. 4 is a sectional view similar to that of FIG. 2 of a third embodiment of the security device according to the invention applied to a bank note,
  • FIG. 5 is a perspective view similar to that of Figure 1 of a fourth embodiment of the invention
  • - Figure 6 is a perspective view similar to that of Figure 1 of a fifth embodiment realization of the invention
  • the security device according to the invention is illustrated in the form of a stamp 1 fixed by bonding to a bank note 2.
  • the stamp 1 includes a security sign 3, here in the form of the symbol of the euro.
  • the security device comprises a layer of transparent material 4, for example a flexible synthetic material having a refractive index of the order of 1.5, in which is incorporated a photoluminescent product emitting in the visible range, and having a suitable thickness to form a waveguide, for example a thickness about 10 ⁇ m.
  • the waveguide layer 4 is covered with a transparent varnish layer 5 having a refractive index lower than the refractive index of the waveguide layer 4.
  • the varnish layer 5 is for example made at by means of a transparent varnish loaded with ultrafine particles of silica (of the order of a few nanometers) so that the varnish has a refractive index close to 1.
  • the security device On its lower face the layer in waveguide 4 is also in contact with a layer of varnish 6 also having a refractive index lower than the refractive index of the waveguide layer 4, for example a layer of varnish analogous to the layer of varnish 5.
  • the layers of Varnishes 5 and 6 essentially have the function of reinforcing the waveguide effect of the waveguide layer 4. In order not to unduly increase the total thickness of the safety device, these layers have a very small thickness for example of the order of microm to be .
  • the security device further comprises a layer of material of white color 7, for example a layer of varnish having a thickness of the order of a micrometer loaded with particles of titanium.
  • a layer of adhesive 8 is in contact with the layer of white material 7.
  • the adhesive is preferably a hot-melt adhesive which allows the hot fixing of the stamp 1 on the banknote 2.
  • the thickness of the layer of adhesive is adapted to allow the attachment of the security device on the object for which it is intended. In the case of a banknote, the thickness of this layer is typically of the order of 2 to 3 ⁇ m.
  • the underside of the waveguide layer 4 further comprises a light extraction pattern formed by a series of elements 9 in the form of curvilinear grooves joined together to form a relief pattern interrupting the waveguide effect and the outline of which forms the safety sign 3.
  • the grooves 9 are V-shaped, the sides of which form with the faces of the waveguide layer 4 an angle suitable for returning the light flowing in the waveguide to the upper surface of the waveguide layer 4 according to a angle allowing the light contained in the waveguide to be extracted.
  • the layer of white matter reinforces this extraction and increases the contrast of the security sign with respect to the adjacent area.
  • the sawtooth relief thus obtained is a diffractive relief so that the light rays coming from the outside reaching the relief pattern 10 do not remain trapped in the waveguide layer 4 but are returned to the outside with a wavelength equal to the distance between crests of the relief pattern 10.
  • the grooves 9 With a width at least equal to 1 ⁇ m, for example of the order of 2 ⁇ m so as not to modify the surface appearance of the safety device too much, the diffractive effect obtained is then in the infrared domain and therefore does not interfere with first level control.
  • the security device is preferably produced by first depositing the layer of varnish 5 on a support film suitably coated with a material allowing separation of the security device from the support film during placement on a banknote.
  • the layer of varnish 5 is deposited on the support film by any suitable printing means, for example by screen printing.
  • the material forming the waveguide layer 4 is then deposited on the varnish layer 5 according to a constant thickness.
  • the transparent varnish layer 6 is then deposited on the waveguide layer 4, also at a constant thickness, then the relief pattern 10 is produced, for example by embossing. Note in this regard that the relief pattern 10 illustrated in Figure 2 has four grooves 9 only so as not to load the figure.
  • the actual pattern will include a large number of grooves so that the sign produced is perceptible to the naked eye.
  • the layer of varnish 6 is covered with the layer of titanium varnish 7 then the layer of adhesive 8.
  • the security device according to the invention is then ready to be fixed on an object to be authenticated .
  • the security device comprises, as before, a waveguide layer generally designated at 4 surrounded by layers of varnish 5 and 6 with a low refractive index, the underside of the security device being as previously provided with a layer of adhesive 8.
  • the waveguide layer 4 has different zones 4.1 and 4.2 adjacent to each other and containing different photoluminescent materials forming between them a light cascade.
  • the light extraction pattern 11 is produced by means of a material having a refractive index greater than the refractive index of the waveguide layer 4.
  • the light extraction pattern 11 can be produced by means of a varnish containing zinc sulfide so that the refractive index of the pattern produced is close to 1.8.
  • the security device is preferably produced by depositing the different layers on a support film, starting with the layer of varnish 5.
  • the zones 4.1 and 4.2 are produced by deposits successive of the materials constituting them.
  • the light extraction pattern 11 can be produced by conventional printing techniques, by vacuum deposition or by any other technique allowing the application of a layer according to a defined contour.
  • the safety device comprises, as in the previous embodiments, a waveguide layer 4 covered on its upper face by a layer of varnish 5 having a refractive index lower than the refractive index of the waveguide layer 4.
  • a reflective layer 12 is applied to the face of the waveguide layer opposite to the varnish layer 5.
  • This reflective layer 12 is example obtained by vacuum deposition of an aluminum layer.
  • the security device is fixed to the bank note 2 by means of an adhesive layer 14 in which a white pigment has been incorporated.
  • the light extraction pattern 13 having a structure identical to the light extraction pattern 10 is this time made on the upper surface of the security device.
  • This embodiment is obtained by first producing a stamp not comprising a light extraction pattern.
  • the stamp is obtained by successively depositing on a support film the varnish layer 5 which is covered with the waveguide layer 4 then the reflective layer 12 and finally the white adhesive layer 14.
  • the stamp thus obtained is transferred to a document and it is only after the transfer that the stamp is subjected to an embossing effecting the light extraction pattern 13.
  • This embossing is for example carried out by hot calendering between rollers, one of which has a safety sign produced in intaglio.
  • This embodiment makes it possible to manufacture a large number of security devices in advance, which makes it possible to use mass production means, then to personalize the security device according to the application. In the case of a bank note, this allows in particular to carry out a security sign corresponding to the serial number of the bank note.
  • the extraction pattern is adjacent to the upper or lower face of the waveguide layer and appears on the upper surface of the security device.
  • Figures 5 and 6 illustrate two embodiments in which the extraction pattern appears on the lateral face of the waveguide layer.
  • the security device according to the fourth embodiment comprises a cutout 16 in the form of € made over the entire thickness of the layer in waveguide 1 so that the internal lateral faces 16 in look at each other form the light extraction pattern locally interrupting the waveguide effect.
  • the safety device according to the fifth embodiment is produced by cutting a sheet of material in waveguide according to a shape of € 17, and application of this shape on the support 2 of so that it is the side faces 18 of the device itself which form the pattern of extrac- tion of light.
  • the extraction pattern can also be produced by studs slightly spaced from one another and visually forming a complete pattern. The studs themselves can have various shapes including points, bars ...
  • the layer of varnish 6 and the layer of white material 7 of the first embodiment may be replaced by a reflective analogous to the reflective layer 12 of the third embodiment.
  • the light extraction pattern whether this is a relief pattern or a pattern produced by means of a material having a refractive index greater than the refractive index of the guide layer. wave, can be made indifferently adjacent to the upper surface or to the lower surface of the waveguide layer.
  • the light extraction motif made of a material with a high refractive index can, like the relief motif, be produced in the form of a series of separate lines or dots to avoid an edge effect when the security sign comprises solid areas .
  • One or more of the transparent layers may contain a dye to modify the color of the light emitted by the photoluminescent product.
  • Different color combinations can also be made using photoluminescent materials of different colors in different areas of the color. che in waveguide, and associate different areas with different light extraction patterns so that they appear in different colors.
  • first level security control and a second level security control by incorporating into the waveguide layer different photoluminescent materials emitting at different wavelengths which can be excited and / or controlled. separately.
  • a relief light extraction motif this has been illustrated by a sawtooth motif, it is possible to provide a relief motif having any configuration suitable for carrying out light extraction, for example example a staircase pattern or a factory roof pattern, that is to say a pattern formed by grooves whose walls have different inclinations, or a pattern formed by dots or perforations of various shapes, made of mechanically or using a laser, each point or each perforation may have a cylindrical, conical or stepped wall.
  • the security device according to the invention has been described in the form of a stamp intended to be affixed to a document, this device can also be produced in the form of a ribbon or a wire which is fixed to the object to be authenticated or incorporated into it, in particular in the case of a bank note or a document printed on a paper support.
  • the security device can also be produced directly on the object to be authenticated by successive deposition of layers and, if necessary, embossing of the layer as a waveguide.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • General Health & Medical Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Textile Engineering (AREA)
  • Vascular Medicine (AREA)
  • Engineering & Computer Science (AREA)
  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Finance (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)
  • Credit Cards Or The Like (AREA)

Abstract

The inventive safety device comprises a transparent substance layer (4) having a refraction index and a thickness suitable for forming a waveguide and containing at least one type of a photoluminescent product. One of the faces of said waveguide layer is provided with a light-extraction pattern (10) which locally disrupts a waveguide effect.

Description

Dispositif de sécurité en guide d'onde Waveguide safety device
La présente invention concerne un dispositif de sécurité pouvant être apposé sur un objet ou incorporé à celui-ci afin d'assurer une sécurité de premier niveau ou de deuxième niveau contre la reproduction frauduleuse de l'objet considéré.The present invention relates to a security device which can be affixed to or incorporated into an object in order to ensure first level or second level security against fraudulent reproduction of the object in question.
ARRIERE PLAN DE L'INVENTION On sait que pour éviter la reproduction frauduleuse d'objet, notamment des documents tels que des billets de banque, ou des cartes bancaires, il est nécessaire que l'objet comporte au moins un dispositif de sécurité qui, pour être efficace, doit être difficile à reproduire tout en étant facilement identifiable.BACKGROUND OF THE INVENTION It is known that in order to avoid fraudulent reproduction of an object, in particular documents such as banknotes, or bank cards, it is necessary that the object includes at least one security device which, for to be effective, must be difficult to reproduce while being easily identifiable.
Le dispositif de sécurité peut être destiné à as- surer une sécurité de premier niveau, c'est-à-dire être identifiable visuellement sans utilisation d'un outil, ou une sécurité de deuxième niveau, c'est-à-dire en utilisant un outil d'identification tel qu'une lampe à ultraviolets ou un capteur infrarouge. On connaît, notamment des documents US-A-6 057The security device may be intended to provide first level security, that is to say be visually identifiable without the use of a tool, or second level security, that is to say by using an identification tool such as an ultraviolet lamp or an infrared sensor. We know, in particular documents US-A-6,057
082 et PE-A-401 466, différents dispositifs de sécurité utilisant des propriétés de diffusion de la lumière. En particulier, on connaît des dispositifs de sécurité sous forme de timbres ou de rubans comportant des hologrammes. L'expérience a montré que les signes réalisés par des hologrammes sont généralement trop compliqués pour être mémorisés par le grand public d'autant plus que les différentes couleurs de l'hologramme ne sont visibles que si l'hologramme est exposé à une source de lumière ponc- tuelle, ce qui n'est généralement pas le cas dans les lieux publics où le contrôle de premier niveau est effectué. En pratique, il suffit donc pour tromper un consommateur d'attention moyenne, que l'objet reproduit frauduleusement comporte un hologramme quelconque ou même sim- plement une partie brillante présentant des reflets va- riables, même si le signe réalisé est sensiblement différent du signe utilisé sur le dispositif de sécurité authentique. En outre, les hologrammes sont coûteux à réaliser et de structure fragile. OBJET DE L'INVENTION082 and PE-A-401 466, various security devices using light scattering properties. In particular, security devices are known in the form of stamps or tapes comprising holograms. Experience has shown that the signs produced by holograms are generally too complicated to be memorized by the general public, especially since the different colors of the hologram are only visible if the hologram is exposed to a light source. punctual, which is generally not the case in public places where first level control is carried out. In practice, it is therefore sufficient to deceive a consumer of average attention, that the object fraudulently reproduced includes any hologram or even simply a shiny part having strong reflections. reliable, even if the sign produced is significantly different from the sign used on the authentic security device. In addition, holograms are expensive to produce and have a fragile structure. OBJECT OF THE INVENTION
Un but de l'invention est de proposer un élément de sécurité pouvant être facilement mémorisé et analysé au moins lors d'un contrôle de premier niveau. BREVE DESCRIPTION DE L'INVENTION En vue de la réalisation de ce but, on propose, selon l'invention, un dispositif de sécurité comportant une couche de matière transparente ayant un indice de réfraction et une épaisseur appropriés pour former un guide d'onde et contenant au moins un produit photoluminescent, une des faces de cette couche en guide d'onde comportant un motif d'extraction de lumière interrompant localement l'effet de guide d'onde.An object of the invention is to propose a security element which can be easily memorized and analyzed at least during a first level control. BRIEF DESCRIPTION OF THE INVENTION With a view to achieving this object, there is provided, according to the invention, a security device comprising a layer of transparent material having an index of refraction and a thickness suitable for forming a waveguide and containing at least one photoluminescent product, one of the faces of this waveguide layer comprising a light extraction pattern locally interrupting the waveguide effect.
Ainsi, quelle que soit la forme de la source de lumière, c'est-à-dire ponctuelle ou diffuse, la lumière qui pénètre dans la couche en guide d'onde excite le produit photoluminescent dont l'émission luminescente ne peut s'échapper de la couche en guide d'onde que par le motif d'extraction de lumière et est donc perçu par un observateur selon le signe formé par le contour de ce mo- tif. En particulier, en prévoyant un produit photoluminescent émettant dans le domaine du visible, il est possible d'assurer un contrôle de premier niveau en observant non seulement le contour du motif d'extraction de lumière, mais la couleur de ce motif. Il est également possible de réaliser un contrôle de deuxième niveau en prévoyant soit un produit photoluminescent excité par un rayonnement ultraviolet au moyen d'une lampe appropriée, soit un produit photoluminescent émettant dans un domaine non visible tel que l'infrarouge, l'analyse étant alors effectuée avec le capteur correspondant, soit une combi- naison de ces deux outils.Thus, whatever the shape of the light source, that is to say point or diffuse, the light which penetrates into the layer in waveguide excites the photoluminescent product from which the luminescent emission cannot escape of the waveguide layer only by the light extraction pattern and is therefore perceived by an observer according to the sign formed by the outline of this pattern. In particular, by providing a photoluminescent product emitting in the visible range, it is possible to provide first level control by observing not only the outline of the light extraction pattern, but the color of this pattern. It is also possible to carry out a second level control by providing either a photoluminescent product excited by ultraviolet radiation by means of an appropriate lamp, or a photoluminescent product emitting in a non-visible range such as infrared, the analysis being then performed with the corresponding sensor, i.e. a combination of these two tools.
Selon une version avantageuse de l'invention, le dispositif de sécurité comporte au moins une couche transparente en contact avec une face de la couche en guide d'onde et ayant un indice de réfraction inférieur à l'indice de réfraction de la couche en guide d'onde. Ainsi, l'effet de guide d'onde est renforcé de sorte que l'on obtient une intensité plus forte de la lumière émise à travers le motif d'extraction de lumière, et on évite en outre une extraction de lumière par des salissures qui seraient appliquées sur la surface externe du dispositif de sécurité lors de l'utilisation de l'objet portant ce dispositif de sécurité, ces salissures ayant généralement un indice de réfraction propre à effectuer une extraction de la lumière à l'endroit des salissures.According to an advantageous version of the invention, the security device comprises at least one transparent layer in contact with one face of the waveguide layer and having a refractive index lower than the refractive index of the guide layer wave. Thus, the waveguide effect is enhanced so that a stronger intensity of the light emitted through the light extraction pattern is obtained, and further extraction of light by soiling which is avoided would be applied to the external surface of the security device when the object carrying this security device is used, these soiling generally having a refractive index suitable for extracting the light at the location of the soiling.
Selon d'autres aspects avantageux de l'invention, le motif d'extraction de lumière est réalisé soit sous forme d'un motif en relief soit sous forme d'un motif réalisé au moyen d'un produit transparent ayant un indice de réfraction supérieur à l'indice de réfraction de la couche en guide d'onde.According to other advantageous aspects of the invention, the light extraction pattern is produced either in the form of a relief pattern or in the form of a pattern produced by means of a transparent product having a higher refractive index. the refractive index of the waveguide layer.
Selon encore un autre aspect avantageux de l'invention, la couche en guide d'onde comporte au moins une zone comportant un premier produit photoluminescent et au moins une zone adjacente comportant un second produit photoluminescent formant une cascade lumineuse avec le premier produit photoluminescent. On obtient ainsi au niveau du motif d'extraction de lumière une couleur qui ne correspond à aucune couleur naturelle de produit pho- toluminescent de sorte que l'on augmente la difficulté de reproduction du dispositif de sécurité.According to yet another advantageous aspect of the invention, the waveguide layer comprises at least one zone comprising a first photoluminescent product and at least one adjacent zone comprising a second photoluminescent product forming a light cascade with the first photoluminescent product. A color is thus obtained at the level of the light extraction pattern which does not correspond to any natural color of photoluminescent product so that the difficulty of reproducing the safety device is increased.
BREVE DESCRIPTION DES DESSINS D'autres caractéristiques et avantages de l'invention apparaîtront à la lecture de la description qui suit de différents modes de réalisation particuliers non limitatifs de l'invention, en relation avec les figures ci-jointes parmi lesquelles :BRIEF DESCRIPTION OF THE DRAWINGS Other characteristics and advantages of the invention will appear on reading the following description of different particular embodiments nonlimiting of the invention, in relation to the attached figures among which:
- la figure 1 est une vue en perspective partielle d'un billet de banque équipé d'un dispositif de sécurité selon l'invention,FIG. 1 is a partial perspective view of a bank note equipped with a security device according to the invention,
- la figure 2 est une vue en coupe très agrandie d'un premier mode de réalisation du dispositif de sécurité selon l'invention avant son application sur un billet de banque, - la figure 3 est une vue en coupe analogue à celle de la figure 2 d'un deuxième mode de réalisation du dispositif de sécurité selon l'invention,- Figure 2 is a very enlarged sectional view of a first embodiment of the security device according to the invention before its application on a banknote, - Figure 3 is a sectional view similar to that of Figure 2 of a second embodiment of the security device according to the invention,
- la figure 4 est une vue en coupe analogue à celle de la figure 2 d'un troisième mode de réalisation du dispositif de sécurité selon l'invention appliqué sur un billet de banque,FIG. 4 is a sectional view similar to that of FIG. 2 of a third embodiment of the security device according to the invention applied to a bank note,
- la figure 5 est une vue en perspective analogue à celle de la figure 1 d'un quatrième mode de réalisation de l'invention, - la figure 6 est une vue en perspective analogue à celle de la figure 1 d'un cinquième mode de réalisation de l'invention,- Figure 5 is a perspective view similar to that of Figure 1 of a fourth embodiment of the invention, - Figure 6 is a perspective view similar to that of Figure 1 of a fifth embodiment realization of the invention,
DESCRIPTION DETAILLEE DE L'INVENTION Le dispositif de sécurité selon l'invention est illustré sous forme d'un timbre 1 fixé par collage sur un billet de banque 2. Le timbre 1 comporte un signe sécuritaire 3, ici en forme de symbole de l'euro.DETAILED DESCRIPTION OF THE INVENTION The security device according to the invention is illustrated in the form of a stamp 1 fixed by bonding to a bank note 2. The stamp 1 includes a security sign 3, here in the form of the symbol of the euro.
En référence à la figure 2, le dispositif de sécurité selon le premier mode de réalisation de l'invention comporte une couche de matière transparente 4, par exemple une matière synthétique flexible ayant un indice de réfraction de l'ordre de 1,5, dans laquelle est incorporé un produit photoluminescent émettant dans le domaine visible, et ayant une épaisseur appropriée pour former un guide d'onde, par exemple une épaisseur d'environ 10 μm. La couche en guide d'onde 4 est recouverte d'une couche de vernis transparent 5 ayant un indice de réfraction inférieur à l'indice de réfraction de la couche en guide d'onde 4. La couche de vernis 5 est par exemple réalisée au moyen d'un vernis transparent chargé avec des particules ultrafines de silice (de l'ordre de quelques nanomètres) de sorte que le vernis a un indice de réfraction voisin de 1. Sur sa face inférieure la couche en guide d'onde 4 est également en con- tact avec une couche de vernis 6 ayant également un indice de réfraction inférieur à l'indice de réfraction de la couche en guide d'onde 4, par exemple une couche de vernis analogue à la couche de vernis 5. Les couches de vernis 5 et 6 ont essentiellement pour fonction de ren- forcer l'effet de guide d'onde de la couche en guide d'onde 4. Afin de ne pas augmenter de façon indue l'épaisseur totale du dispositif de sécurité, ces couches ont une épaisseur très faible par exemple de l'ordre du micromètre . Dans ce premier mode de réalisation, le dispositif de sécurité comporte en outre une couche de matière de couleur blanche 7, par exemple une couche de vernis ayant une épaisseur de l'ordre du micromètre chargé avec des particules de titane. Une couche d'adhésif 8 est en contact avec la couche de matière blanche 7. L'adhésif est de préférence un adhésif thermofusible qui permet la fixation à chaud du timbre 1 sur le billet de banque 2. L'épaisseur de la couche d'adhésif est adaptée pour permettre la fixation du dispositif de sécurité sur l'objet auquel il est destiné. Dans le cas d'un billet de banque, l'épaisseur de cette couche est typiquement de l'ordre de 2 à 3 μm.With reference to FIG. 2, the security device according to the first embodiment of the invention comprises a layer of transparent material 4, for example a flexible synthetic material having a refractive index of the order of 1.5, in which is incorporated a photoluminescent product emitting in the visible range, and having a suitable thickness to form a waveguide, for example a thickness about 10 μm. The waveguide layer 4 is covered with a transparent varnish layer 5 having a refractive index lower than the refractive index of the waveguide layer 4. The varnish layer 5 is for example made at by means of a transparent varnish loaded with ultrafine particles of silica (of the order of a few nanometers) so that the varnish has a refractive index close to 1. On its lower face the layer in waveguide 4 is also in contact with a layer of varnish 6 also having a refractive index lower than the refractive index of the waveguide layer 4, for example a layer of varnish analogous to the layer of varnish 5. The layers of Varnishes 5 and 6 essentially have the function of reinforcing the waveguide effect of the waveguide layer 4. In order not to unduly increase the total thickness of the safety device, these layers have a very small thickness for example of the order of microm to be . In this first embodiment, the security device further comprises a layer of material of white color 7, for example a layer of varnish having a thickness of the order of a micrometer loaded with particles of titanium. A layer of adhesive 8 is in contact with the layer of white material 7. The adhesive is preferably a hot-melt adhesive which allows the hot fixing of the stamp 1 on the banknote 2. The thickness of the layer of adhesive is adapted to allow the attachment of the security device on the object for which it is intended. In the case of a banknote, the thickness of this layer is typically of the order of 2 to 3 μm.
Dans le premier mode de réalisation illustré, la face inférieure de la couche en guide d'onde 4 comporte en outre un motif d'extraction de lumière formé par une série d'éléments 9 en forme de rainures curvilignes accolées les unes aux autres pour former un motif en relief interrompant l'effet de guide d'onde et dont le contour forme le signe sécuritaire 3. Dans le mode de réalisation illustré, les rainures 9 sont en forme de V dont les côtés forment avec les faces de la couche en guide d'onde 4 un angle adapté pour renvoyer la lumière circulant dans le guide d'onde vers la surface supérieure de la couche en guide d'onde 4 selon un angle permettant une extrac- tion de la lumière contenue dans le guide d'onde. La couche de matière blanche renforce cette extraction et augmente le contraste du signe sécuritaire par rapport à la zone adjacente.In the first illustrated embodiment, the underside of the waveguide layer 4 further comprises a light extraction pattern formed by a series of elements 9 in the form of curvilinear grooves joined together to form a relief pattern interrupting the waveguide effect and the outline of which forms the safety sign 3. In the illustrated embodiment, the grooves 9 are V-shaped, the sides of which form with the faces of the waveguide layer 4 an angle suitable for returning the light flowing in the waveguide to the upper surface of the waveguide layer 4 according to a angle allowing the light contained in the waveguide to be extracted. The layer of white matter reinforces this extraction and increases the contrast of the security sign with respect to the adjacent area.
En outre, le relief en dent de scie ainsi obtenu est un relief diffractif de sorte que les rayons lumineux en provenance de l'extérieur atteignant le motif en relief 10 ne restent pas emprisonnés dans la couche en guide d'onde 4 mais sont renvoyés vers l'extérieur avec une longueur d'onde égale à la distance entre crêtes du motif en relief 10. Lorsque l'on souhaite éviter un effet visible de l'effet diffractif du motif en relief 10 par rapport à l'émission photoluminescente, il suffit donc de réaliser les rainures 9 selon une largeur au moins égale à 1 μm, par exemple de l'ordre de 2 μm afin de ne pas trop modifier l'aspect de surface du dispositif de sécurité, l'effet diffractif obtenu est alors dans le domaine infrarouge et ne vient donc pas perturber le contrôle de premier niveau. Il permet au contraire d'assurer un contrôle de deuxième niveau en vérifiant que le signe sécu- ritaire 3 est visible lorsque le dispositif de sécurité est analysé au moyen d'un capteur infrarouge.In addition, the sawtooth relief thus obtained is a diffractive relief so that the light rays coming from the outside reaching the relief pattern 10 do not remain trapped in the waveguide layer 4 but are returned to the outside with a wavelength equal to the distance between crests of the relief pattern 10. When it is desired to avoid a visible effect of the diffractive effect of the relief pattern 10 relative to the photoluminescent emission, it suffices therefore to produce the grooves 9 with a width at least equal to 1 μm, for example of the order of 2 μm so as not to modify the surface appearance of the safety device too much, the diffractive effect obtained is then in the infrared domain and therefore does not interfere with first level control. On the contrary, it makes it possible to ensure a second level control by verifying that the security sign 3 is visible when the security device is analyzed by means of an infrared sensor.
En pratique, le dispositif de sécurité selon ce premier mode de réalisation est de préférence réalisé en déposant tout d'abord la couche de vernis 5 sur un film support convenablement enduit d'une matière permettant une séparation du dispositif de sécurité à partir du film support lors de la mise en place sur un billet de banque. La couche de vernis 5 est déposée sur le film support par tout moyen d'impression approprié, par exemple par séri- graphie. La matière formant la couche en guide d'onde 4 est ensuite déposée sur la couche de vernis 5 selon une épaisseur constante. La couche de vernis transparent 6 est ensuite déposée sur la couche en guide d'onde 4, également selon une épaisseur constante, puis le motif en relief 10 est réalisé, par exemple par embossage. On notera à ce propos que le motif en relief 10 illustré sur la figure 2 comporte quatre rainures 9 seulement pour ne pas charger la figure. Compte tenu de la très faible largeur des rainures 9, le motif réel comportera un grand nombre de rainures afin que le signe réalisé soit perceptible à l'oeil nu. Après embossage du motif en relief 10, la couche de vernis 6 est recouverte avec la couche de vernis au titane 7 puis la couche d'adhésif 8. Le dispositif de sécurité selon l'invention est alors prêt à être fixé sur un objet à authentifier.In practice, the security device according to this first embodiment is preferably produced by first depositing the layer of varnish 5 on a support film suitably coated with a material allowing separation of the security device from the support film during placement on a banknote. The layer of varnish 5 is deposited on the support film by any suitable printing means, for example by screen printing. The material forming the waveguide layer 4 is then deposited on the varnish layer 5 according to a constant thickness. The transparent varnish layer 6 is then deposited on the waveguide layer 4, also at a constant thickness, then the relief pattern 10 is produced, for example by embossing. Note in this regard that the relief pattern 10 illustrated in Figure 2 has four grooves 9 only so as not to load the figure. Given the very small width of the grooves 9, the actual pattern will include a large number of grooves so that the sign produced is perceptible to the naked eye. After embossing the relief pattern 10, the layer of varnish 6 is covered with the layer of titanium varnish 7 then the layer of adhesive 8. The security device according to the invention is then ready to be fixed on an object to be authenticated .
En référence à la figure 3, le dispositif de sécurité comporte comme précédemment une couche en guide d'onde généralement désignée en 4 encadrée par des couches de vernis 5 et 6 à faible indice de réfraction, la face inférieure du dispositif de sécurité étant comme précédemment pourvue d'une couche d'adhésif 8. Dans ce mode de réalisation, la couche en guide d'onde 4 comporte différentes zones 4.1 et 4.2 adjacentes les unes aux autres et contenant des matière photoluminescentes diffé- rentes formant entre elles une cascade lumineuse. En outre, dans ce mode de réalisation le motif d'extraction de lumière 11 est réalisé au moyen d'une matière ayant un indice de réfraction supérieur à l'indice de réfraction de la couche en guide d'onde 4. A titre d'exemple, le mo- tif d'extraction de lumière 11 peut être réalisé au moyen d'un vernis contenant du sulfure de zinc de sorte que l'indice de réfraction du motif réalisé est voisin de 1,8.With reference to FIG. 3, the security device comprises, as before, a waveguide layer generally designated at 4 surrounded by layers of varnish 5 and 6 with a low refractive index, the underside of the security device being as previously provided with a layer of adhesive 8. In this embodiment, the waveguide layer 4 has different zones 4.1 and 4.2 adjacent to each other and containing different photoluminescent materials forming between them a light cascade. Furthermore, in this embodiment, the light extraction pattern 11 is produced by means of a material having a refractive index greater than the refractive index of the waveguide layer 4. By way of example, the light extraction pattern 11 can be produced by means of a varnish containing zinc sulfide so that the refractive index of the pattern produced is close to 1.8.
De même que dans le premier mode de réalisation le dispositif de sécurité selon ce mode de réalisation est de préférence réalisé en déposant les différentes couches sur un film support en commençant par la couche de vernis 5. Les zones 4.1 et 4.2 sont réalisées par des dépôts successifs des matières les constituant. Le motif d'extraction de lumière 11 peut être réalisé par des techniques d'impression classiques, par dépôt sous vide ou par toute autre technique permettant l'application d'une couche selon un contour défini.As in the first embodiment, the security device according to this embodiment is preferably produced by depositing the different layers on a support film, starting with the layer of varnish 5. The zones 4.1 and 4.2 are produced by deposits successive of the materials constituting them. The light extraction pattern 11 can be produced by conventional printing techniques, by vacuum deposition or by any other technique allowing the application of a layer according to a defined contour.
En référence à la figure 4, le dispositif de sé- curité comporte comme dans les modes de réalisation précédents, une couche en guide d'onde 4 recouverte sur sa face supérieure par une couche de vernis 5 ayant un indice de réfraction inférieur à l'indice de réfraction de la couche en guide d'onde 4. Dans ce mode de réalisation, une couche réfléchissante 12 est appliquée sur la face de la couche en guide d'onde opposée à la couche de vernis 5. Cette couche réfléchissante 12 est par exemple obtenue par dépôt sous vide d'une couche d'aluminium. Comme précédemment, le dispositif de sécurité est fixé sur le billet de banque 2 au moyen d'une couche d'adhésif 14 dans laquelle a été incorporé un pigment blanc.With reference to FIG. 4, the safety device comprises, as in the previous embodiments, a waveguide layer 4 covered on its upper face by a layer of varnish 5 having a refractive index lower than the refractive index of the waveguide layer 4. In this embodiment, a reflective layer 12 is applied to the face of the waveguide layer opposite to the varnish layer 5. This reflective layer 12 is example obtained by vacuum deposition of an aluminum layer. As before, the security device is fixed to the bank note 2 by means of an adhesive layer 14 in which a white pigment has been incorporated.
Dans ce mode de réalisation, le motif d'extraction de lumière 13 ayant une structure identique au motif d'extraction de lumière 10 est cette fois réali- se sur la surface supérieure du dispositif de sécurité.In this embodiment, the light extraction pattern 13 having a structure identical to the light extraction pattern 10 is this time made on the upper surface of the security device.
Ce mode de réalisation est obtenu en réalisant tout d'abord un timbre ne comportant pas de motif d'extraction de lumière. Le timbre est obtenu en déposant successivement sur un film support la couche de vernis 5 qui est recouverte avec la couche en guide d'onde 4 puis la couche réfléchissante 12 et enfin la couche d'adhésif blanc 14. Le timbre ainsi obtenu est transféré sur un document et c'est seulement après le transfert que le timbre est soumis à un embossage réalisant le motif d'extraction de lumière 13. Cet embossage est par exemple réalisé par calandrage à chaud entre des rouleaux dont l'un comporte un signe sécuritaire réalisé en taille douce. Ce mode de réalisation permet de fabriquer à l'avance un grand nombre de dispositifs de sécurité, ce qui permet d'utiliser des moyens de production en série, puis de personnaliser le dispositif de sécurité en fonction de l'application. Dans le cas d'un billet de banque, cela permet en particulier de réaliser un signe sécuritaire correspondant au numéro de série du billet de ban- que .This embodiment is obtained by first producing a stamp not comprising a light extraction pattern. The stamp is obtained by successively depositing on a support film the varnish layer 5 which is covered with the waveguide layer 4 then the reflective layer 12 and finally the white adhesive layer 14. The stamp thus obtained is transferred to a document and it is only after the transfer that the stamp is subjected to an embossing effecting the light extraction pattern 13. This embossing is for example carried out by hot calendering between rollers, one of which has a safety sign produced in intaglio. This embodiment makes it possible to manufacture a large number of security devices in advance, which makes it possible to use mass production means, then to personalize the security device according to the application. In the case of a bank note, this allows in particular to carry out a security sign corresponding to the serial number of the bank note.
Dans les modes de réalisation précédents le motif d'extraction est adjacent à la face supérieure ou inférieure de la couche en guide d'onde et apparaît sur la surface supérieure du dispositif de sécurité. Les figures 5 et 6 illustrent deux modes de réalisation dans lesquels le motif d'extraction apparaît sur la face latérale de la couche en guide d'onde.In the previous embodiments, the extraction pattern is adjacent to the upper or lower face of the waveguide layer and appears on the upper surface of the security device. Figures 5 and 6 illustrate two embodiments in which the extraction pattern appears on the lateral face of the waveguide layer.
Dans le cas de la figure 5, le dispositif de sécurité selon le quatrième mode de réalisation comporte une découpe 16 en forme de € réalisé sur toute l'épaisseur de la couche en guide d'onde 1 de sorte que les faces latérales 16 internes en regard l'une de l'autre forment le motif d'extraction de lumière interrompant localement l'effet le guide d'onde. Dans le cas de la figure 6, le dispositif de sécurité selon le cinquième mode de réalisation est réalisé par découpage d'une feuille de matière en guide d'onde selon une forme de € 17, et application de cette forme sur le support 2 de sorte que ce sont les faces latérales 18 du dispositif lui-même qui forment le motif d' extrac- tion de lumière. Dans ce mode de réalisation le motif d'extraction peut également être réalisé par des plots légèrement espacés les uns des autres et formant visuellement un motif complet. Les plots eux-mêmes peuvent avoir des formes variées comprenant des points, des barrettes...In the case of FIG. 5, the security device according to the fourth embodiment comprises a cutout 16 in the form of € made over the entire thickness of the layer in waveguide 1 so that the internal lateral faces 16 in look at each other form the light extraction pattern locally interrupting the waveguide effect. In the case of FIG. 6, the safety device according to the fifth embodiment is produced by cutting a sheet of material in waveguide according to a shape of € 17, and application of this shape on the support 2 of so that it is the side faces 18 of the device itself which form the pattern of extrac- tion of light. In this embodiment, the extraction pattern can also be produced by studs slightly spaced from one another and visually forming a complete pattern. The studs themselves can have various shapes including points, bars ...
Bien entendu, l'invention n'est pas limitée aux modes de réalisation décrits et on peut y apporter des variantes de réalisation sans sortir du cadre de 1 ' inven- tion tel que défini par les revendications.Of course, the invention is not limited to the embodiments described and it is possible to make variant embodiments without departing from the scope of the invention as defined by the claims.
En particulier, on peut réaliser différentes combinaisons des couches décrites en relation avec chacun des modes de réalisation illustrés. A titre d'exemple, on peut remplacer la couche de vernis 6 et la couche de ma- tière blanche 7 du premier mode de réalisation par une réfléchissante analogue à la couche réfléchissante 12 du troisième mode de réalisation.In particular, different combinations of the layers described can be produced in relation to each of the illustrated embodiments. By way of example, the layer of varnish 6 and the layer of white material 7 of the first embodiment may be replaced by a reflective analogous to the reflective layer 12 of the third embodiment.
On notera également que le motif d'extraction de lumière, que celui-ci soit un motif en relief ou un motif réalisé au moyen d'une matière ayant un indice de réfraction supérieur à l'indice de réfraction de la couche en guide d'onde, peut être réalisé indifféremment adjacent à la surface supérieure ou à la surface inférieure de la couche en guide d'onde. Le motif d'extraction de lumière réalisé en matière à indice de réfraction élevé peut, comme le motif en relief, être réalisé sous forme d'une série de lignes ou de points séparés pour éviter un effet de bord lorsque le signe sécuritaire comprend des aplats. L'une ou plu- sieurs des couches transparentes peut contenir un colorant pour modifier la couleur de la lumière émise par le produit photoluminescent .It will also be noted that the light extraction pattern, whether this is a relief pattern or a pattern produced by means of a material having a refractive index greater than the refractive index of the guide layer. wave, can be made indifferently adjacent to the upper surface or to the lower surface of the waveguide layer. The light extraction motif made of a material with a high refractive index can, like the relief motif, be produced in the form of a series of separate lines or dots to avoid an edge effect when the security sign comprises solid areas . One or more of the transparent layers may contain a dye to modify the color of the light emitted by the photoluminescent product.
On peut également réaliser différentes combinaisons de couleur utilisant des matières photoluminescentes de différentes couleurs dans différentes zones de la cou- che en guide d'onde, et associer aux différentes zones différents motifs d'extraction de lumière de sorte que ceux-ci apparaissent selon des couleurs différentes.Different color combinations can also be made using photoluminescent materials of different colors in different areas of the color. che in waveguide, and associate different areas with different light extraction patterns so that they appear in different colors.
On peut également combiner un contrôle de sécuri- té de premier niveau et un contrôle de sécurité de deuxième niveau en incorporant à la couche en guide d'onde des matières photoluminescentes différentes émettant à des longueurs d'ondes différentes pouvant être excitées et/ou contrôlées séparément. Bien que dans le cas d'un motif d'extraction de lumière en relief, celui-ci ait été illustré par un motif en dent de scie, on peut prévoir un motif en relief ayant toute configuration appropriée pour réaliser une extraction de lumière, par exemple un motif en escalier ou un motif en toit d'usine, c'est-à-dire un motif formé de rainures dont les parois ont des inclinaisons différentes, ou encore un motif formé de points ou de perforations de formes variées, réalisés de façon mécanique ou à l'aide d'un laser, chaque point ou chaque perforation pouvant comporter une paroi cylindrique, conique ou en escalier.It is also possible to combine a first level security control and a second level security control by incorporating into the waveguide layer different photoluminescent materials emitting at different wavelengths which can be excited and / or controlled. separately. Although in the case of a relief light extraction motif, this has been illustrated by a sawtooth motif, it is possible to provide a relief motif having any configuration suitable for carrying out light extraction, for example example a staircase pattern or a factory roof pattern, that is to say a pattern formed by grooves whose walls have different inclinations, or a pattern formed by dots or perforations of various shapes, made of mechanically or using a laser, each point or each perforation may have a cylindrical, conical or stepped wall.
Bien que le dispositif de sécurité selon l'invention ait été décrit sous forme d'un timbre destiné à être apposé sur un document, ce dispositif peut égale- ment être réalisé sous forme d'un ruban ou d'un fil qui est fixé à l'objet à authentifier ou est incorporé à celui-ci, en particulier dans le cas d'un billet de banque ou d'un document imprimé sur un support en papier. Lorsque l'objet à identifier comprend un support mince, le dispositif de sécurité peut également être réalisé directement sur l'objet à authentifier par dépôt successif de couches et, le cas échéant, embossage de la couche en guide d'onde. Ceci s'applique en particulier à un billet de banque réalisé à partir d'un film transparent, le billet lui-même étant alors formé de la couche en guide d'onde et comportant au moins une zone non imprimée pour laisser la lumière pénétrer dans la couche en guide d'onde de sorte que le motif d'extraction est formé soit par le bord du billet lui-même soit par un motif réalisé sur l'une des faces du billet. Although the security device according to the invention has been described in the form of a stamp intended to be affixed to a document, this device can also be produced in the form of a ribbon or a wire which is fixed to the object to be authenticated or incorporated into it, in particular in the case of a bank note or a document printed on a paper support. When the object to be identified comprises a thin support, the security device can also be produced directly on the object to be authenticated by successive deposition of layers and, if necessary, embossing of the layer as a waveguide. This applies in particular to a bank note produced from a transparent film, the note itself then being formed from the guide layer wave and comprising at least one unprinted zone to allow light to penetrate into the waveguide layer so that the extraction pattern is formed either by the edge of the banknote itself or by a pattern produced on the 'one side of the ticket.

Claims

REVENDICATIONS
1. dispositif de sécurité, caractérisé en ce qu'il comporte une couche de matière transparente (4) ayant un indice de réfraction et une épaisseur appropriés pour former un guide d'onde, et contenant au moins un produit photoluminescent, une des faces de cette couche1. safety device, characterized in that it comprises a layer of transparent material (4) having a refractive index and a thickness suitable for forming a waveguide, and containing at least one photoluminescent product, one of the faces of this layer
(4) en guide d'onde comportant un motif d'extraction de lumière (10, 11, 13, 16, 18) interrompant localement l'effet de guide d'onde.(4) in waveguide comprising a light extraction pattern (10, 11, 13, 16, 18) locally interrupting the waveguide effect.
2. Dispositif de sécurité selon la revendication 1, caractérisé en ce que le motif d'extraction de lumière (11) est réalisé en une matière ayant un indice de réfraction supérieur à l'indice de réfraction de la couche en guide d'onde (4) .2. Safety device according to claim 1, characterized in that the light extraction pattern (11) is made of a material having a refractive index greater than the refractive index of the waveguide layer ( 4).
3. Dispositif de sécurité selon la revendication 1, caractérisé en ce que le motif d'extraction de lumière (10, 13) est un motif en relief.3. Safety device according to claim 1, characterized in that the light extraction pattern (10, 13) is a relief pattern.
4. Dispositif de sécurité selon la revendication 3, caractérisé en ce que le motif en relief est diffractif.4. Safety device according to claim 3, characterized in that the relief pattern is diffractive.
5. Dispositif de sécurité selon la revendication 4, caractérisé en ce que le motif en relief est formé d'éléments (9) ayant une largeur au moins égale à un mi- cromètre .5. Safety device according to claim 4, characterized in that the relief pattern is formed of elements (9) having a width at least equal to a micrometer.
6. Dispositif de sécurité selon la revendication 1, caractérisé en ce qu'il comporte une couche de couleur blanche (7) s 'étendant sur une face de la couche en guide d'onde (4) en regard du motif d'extraction de lumière (10) .6. Safety device according to claim 1, characterized in that it comprises a white color layer (7) extending over one face of the waveguide layer (4) opposite the extraction pattern of light (10).
7. Dispositif de sécurité selon la revendication 1, caractérisé en ce qu'il comporte au moins une couche transparente (5, 6) en contact avec une face de la couche en guide d'onde (4) et ayant un indice de réfraction in- férieur à l'indice de réfraction de la couche en guide d' onde (4 ) .7. Safety device according to claim 1, characterized in that it comprises at least one transparent layer (5, 6) in contact with one face of the waveguide layer (4) and having a refractive index in - lower than the refractive index of the guide layer wave (4).
8. Dispositif de sécurité selon la revendication 1, caractérisé en ce qu'il comporte une couche réfléchissante (12) s 'étendant sur un côté de la couche en guide d'onde (4) .8. Safety device according to claim 1, characterized in that it comprises a reflective layer (12) extending on one side of the waveguide layer (4).
9. Dispositif de sécurité selon les revendications 6 et 7 prises en combinaison, caractérisé en ce qu'il comporte une couche transparente (6) interposée entre la couche de matière blanche (7) et la couche en guide d'onde (4) .9. Safety device according to claims 6 and 7 taken in combination, characterized in that it comprises a transparent layer (6) interposed between the layer of white material (7) and the waveguide layer (4).
10. Dispositif de sécurité selon les revendications 6 et 8 prises en combinaison, caractérisé en ce la couche réfléchissante (12) est interposée entre la couche de matière blanche (14) et la couche en guide d'onde (4). 10. Safety device according to claims 6 and 8 taken in combination, characterized in that the reflective layer (12) is interposed between the white material layer (14) and the waveguide layer (4).
11. Dispositif de sécurité selon la revendication11. Safety device according to claim
1, caractérisé en ce que la couche en guide d'onde (4) comporte au moins une zone (4.1) comportant un premier produit photoluminescent et au moins une zone adjacente1, characterized in that the waveguide layer (4) comprises at least one zone (4.1) comprising a first photoluminescent product and at least one adjacent zone
(4.2) contenant un second produit photoluminescent for- mant une cascade lumineuse avec le premier produit photoluminescent . (4.2) containing a second photoluminescent product forming a light cascade with the first photoluminescent product.
EP03815118A 2003-01-03 2003-12-29 Waveguide safety device Ceased EP1578617A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0300032A FR2849708B1 (en) 2003-01-03 2003-01-03 WAVEGUIDE SECURITY DEVICE
FR0300032 2003-01-03
PCT/FR2003/003923 WO2004062942A1 (en) 2003-01-03 2003-12-29 Waveguide safety device

Publications (1)

Publication Number Publication Date
EP1578617A1 true EP1578617A1 (en) 2005-09-28

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EP03815118A Ceased EP1578617A1 (en) 2003-01-03 2003-12-29 Waveguide safety device

Country Status (4)

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EP (1) EP1578617A1 (en)
FR (1) FR2849708B1 (en)
OA (1) OA13016A (en)
WO (1) WO2004062942A1 (en)

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AT502868B1 (en) * 2005-03-21 2008-06-15 Oebs Gmbh SECURITY ELEMENT
CA2665517A1 (en) 2006-10-12 2008-04-17 Reserve Bank Of Australia A security document with micro-prisms
DE102008033718B4 (en) * 2008-07-14 2021-07-29 Bundesdruckerei Gmbh Security document with a light guide
CN102781629B (en) 2009-12-18 2015-11-25 奥雷尔·菲斯利防伪印刷股份公司 There is the secure file of fiber waveguide
AT509928A2 (en) 2010-05-26 2011-12-15 Hueck Folien Gmbh SECURITY ELEMENT WITH LIGHTING STRUCTURES
CN105163948B (en) * 2013-04-03 2018-01-09 Ccl证券私人有限公司 The method at the edge of secure file and detection secure file

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Also Published As

Publication number Publication date
WO2004062942A1 (en) 2004-07-29
FR2849708B1 (en) 2005-03-11
OA13016A (en) 2006-11-10
FR2849708A1 (en) 2004-07-09

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