EP4187512A1 - Dispositif et procédé de détection optique d'un produit de valeur ou de sécurité - Google Patents

Dispositif et procédé de détection optique d'un produit de valeur ou de sécurité Download PDF

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Publication number
EP4187512A1
EP4187512A1 EP22208103.6A EP22208103A EP4187512A1 EP 4187512 A1 EP4187512 A1 EP 4187512A1 EP 22208103 A EP22208103 A EP 22208103A EP 4187512 A1 EP4187512 A1 EP 4187512A1
Authority
EP
European Patent Office
Prior art keywords
light
support plate
security
irradiation angle
optical detection
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.)
Pending
Application number
EP22208103.6A
Other languages
German (de)
English (en)
Inventor
Uwe Rabeler
Thater Marcel
Fox Thomas
Klaus Dr. Herrmann
Holger Hesse
Jan-Ole SCHÜRING
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.)
Bundesdruckerei GmbH
Original Assignee
Bundesdruckerei GmbH
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 Bundesdruckerei GmbH filed Critical Bundesdruckerei GmbH
Publication of EP4187512A1 publication Critical patent/EP4187512A1/fr
Pending legal-status Critical Current

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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
    • G07D7/003—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 security elements
    • G07D7/0032—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 security elements using holograms
    • 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
    • G07D7/121—Apparatus characterised by sensor details

Definitions

  • the invention relates to a device for the optical detection of a valuable or security product with a first security feature that is reconstructed at a first irradiation angle and with a second security feature that is reconstructed at a second irradiation angle that differs from the first irradiation angle.
  • the invention also relates to a method for the optical detection of such a valuable or security product.
  • Valuable or security products can be, for example, an identity card, another personal document, a check card, a non-personalized authorization ID such as a ticket or a means of payment, or a value or security element intended for product security.
  • holograms are entities that have at least one feature that makes unauthorized duplication, imitation and/or falsification of an object into which the security element is integrated more difficult.
  • Holograms are used as security features in passports or identity cards, for example. However, they are also used in banknotes, driver's licenses, visas, other stamps, labels or tickets, credit cards, bank cards, telephone cards or the like.
  • Volume holograms represent a special group of holograms. In a volume hologram, a diffractive structure of the hologram is stored in the volume of the holographic recording material.
  • holographic exposure films which are mostly provided on rolls. These exposure films are suitable for storing interference structures whose characteristic dimensions are in the range of the light wavelength of the light that is used for recording or reconstructing the hologram.
  • the holographic exposure film is placed in front of a master in which diffractive structures are formed which are to be "transferred” into the holographic exposure film.
  • the diffractive structures of the master are copied into the holographic film.
  • coherent light is radiated onto the master through the holographic film, which is arranged in the immediate vicinity in front of the master or in contact with the master.
  • the diffractive structures in the master bend the light such that the diffracted light is reflected back into the holographic film. There it interferes with the coherent light that is used to illuminate the master. An interference structure is thus formed in the holographic film, which is defined by the light diffracted at the master.
  • the reconstruction is similar to that observed when the master is illuminated.
  • a hologram is stored in the holographic film, which is also referred to as a Denisyuk hologram and is a volume reflection hologram. It goes without saying that the incident light must have a suitable wavelength (or suitable wavelengths) and a suitable irradiation direction (or suitable irradiation directions), so that diffraction at the diffraction structure takes place in the desired manner.
  • the use of holographic features formed from volume holograms is suitable, since they are particularly suitable for verification when the exposed and developed holographic film is viewed perpendicularly, for example.
  • the reconstruction light is preferably irradiated at an acute angle, for example at 45 degrees to the perpendicular.
  • the angle between the irradiation direction of the reconstruction light and the exit direction of the generated light Volume hologram of diffracted light, which reconstructs the information of the hologram, is essentially determined during the production of the master.
  • the device according to the invention comprises an at least partially transparent support plate on which the product of value or security can be placed. Furthermore, an optical detection device is present, the optics of which are directed at a partially transparent mirror, which comprises a front side facing the support plate and a rear side facing away from the support plate. The mirror is positioned in the beam path of the optical detection device in order to deflect a light impinging on it from the support plate on its front side in the direction of the optical detection device.
  • a first lighting device which is set up to emit light directly at the support plate at the first irradiation angle.
  • a second illumination device which is set up to emit light at the second irradiation angle onto the rear side of the mirror, with it being transmitted through the mirror to the front side and thus to the support plate is let through.
  • This configuration has the advantage that all security features, in particular the holographic security features of the valuable or security product, can be reliably optically detected.
  • the opening angle of the lens of the optical detection device, in particular a camera, is designed in such a way that the support plate can be fully detected. A full-area and high-contrast detection of the security features on the entire area of the value or security product is thus possible; in particular the recording of the identigram (a registered trademark of the applicant).
  • Holographic security features come to light or are reconstructed particularly well when they are irradiated at an angle of irradiation that corresponds or almost corresponds to the angle of incidence of the angle corresponding to the exposure of the hologram, in other words the irradiation angle is the reconstruction angle or almost the Reconstruction angle of the holographic security feature should correspond.
  • the greater the proportion of the directed light the more clearly the security features formed in this way become visible.
  • the lighting devices are formed from a light-emitting diode arrangement with a plurality of light-emitting diodes which have a narrow emission angle of between 5 degrees and 15 degrees.
  • the light-emitting diodes preferably have an emission angle of 10 degrees, which has proven to be particularly reliable for the reconstruction of the holographic security features of the value or security product.
  • Contrast enhancing films proven. These can be applied to the support plate, for example. Alternatively, the lens of the optical detection device can also be provided with such a contrast-enhancing film.
  • the contrast-enhancing film can be designed as an optical filter that is set up to increase the contrast via the wavelength of the incident light and/or the angle of incidence of the incident light and/or the polarization of the incident light, since wavelengths "of lower interest" can be filtered out.
  • several foils can also be arranged one on top of the other in order to increase the contrast.
  • the contrast-enhancing film is preferably a laminate of several film layers that are arranged one on top of the other.
  • the foils or the foil layers themselves can have different optical characteristics.
  • the contrast-enhancing film is applied, for example, in a decal process, or a contrast-enhancing coating is applied as a liquid.
  • a further possibility for sending light beams directed over a large area onto the support plate is that an f-theta lens or an f-theta objective is integrated in the beam path of the lighting devices.
  • the optical detection device is preferably an image sensor of a camera.
  • the camera is designed as a CCD camera, a NIR (near infrared) camera or a UV (ultraviolet) camera.
  • the camera is preferably designed as a VIS camera that captures the light rays from the spectrum that is visible to the human eye.
  • the reconstruction of holographic security features depends not only on the reconstruction angle but also on the wavelength of the incident light, there is the possibility that the two security features will be reconstructed at different reconstruction wavelengths or reconstruction wavelength ranges. To therefore value or To be able to read security products that are equipped with holographic features that reconstruct at different reconstruction wavelengths, it has proven to be advantageous if the first illumination device is set up to emit light in one wavelength or a wavelength range, and if the second illumination device is set up To emit light in a further wavelength or a further wavelength range, which differ from those of the first lighting device.
  • the first irradiation direction of the first lighting device is a 45-degree grazing light.
  • the second irradiation direction of the second illumination device can be 0-degree coaxial light.
  • the value or security product with its holographic security features can also be recorded and read by machine using this method.
  • the two lighting devices are switched alternately in order to reconstruct the security features.
  • 45-degree grazing light is emitted, which ideally emerges perpendicularly from its surface of the first lighting device and impinges on the support glass. It hits the support plate at an angle of 45 degrees.
  • the second lighting device emits 0-degree coaxial light, which ideally exits perpendicularly with respect to its surface and impinges on the support plate. It passes through the semi-transparent mirror and hits the platen perpendicularly, i.e. at an angle of 0 degrees with respect to the surface normal of the platen.
  • the exposure time of the optical detection device lags behind the frequency of the alternating switching of the two lighting devices.
  • the value or security product provided with the multiple security features can be a value or security document or a security element, i.e. an element that is connected, for example, to an object to be protected against imitation, counterfeiting or falsification, for example a sticker, label or the like.
  • a passport, an ID card, a driver’s license or another ID card or an access control card, a vehicle registration document, a vehicle registration document, a visa, a check, other means of payment, in particular a banknote, a check or a bank can be used as valuable or security products -, or a credit or cash card, loyalty card, health card, smart card, company ID card, proof of entitlement, membership card or other ID document.
  • the value or security product is in ID 1, ID 2, ID 3 or some other format, for example in booklet form, like a passport-like item.
  • the valuable or security product is generally a laminate of several document layers, which are connected to one another with a precise fit under the action of heat and increased pressure. These products should meet the standardized requirements, for example ISO 10373, ISO/IEC 7810, ISO 14443.
  • the product layers preferably consist of a carrier material that is suitable for lamination.
  • the product of value or security can preferably be formed from a polymer selected from a group comprising polycarbonate (PC), in particular bisphenol A polycarbonate or a polycarbonate formed with a geminally disubstituted bis(hydroxyphenyl)cycloalkane, polyethylene terephthalate (PET), their derivatives, such as glycol-modified PET (PETG), polyethylene naphthalate (PEN), polyvinyl chloride (PVC), polyvinyl butyral (PVB), polymethyl methacrylate (PMMA), polyimide (PI), polyvinyl alcohol (PVA), polystyrene (PS) , polyvinylphenol (PVP), polypropylene (PP), polyethylene (PE), thermoplastic elastomers (TPE), in particular thermoplastic polyurethane (TPU), acrylonitrile-butadiene-styrene copolymer (ABS) and derivatives
  • the product can also be made of several of these materials. It preferably consists of PC, PVC and PET.
  • the polymers can be either filled or unfilled. In the latter case, they are preferably transparent or translucent. If the polymers are filled, they are opaque.
  • the above information relates both to films to be bonded together and to liquid formulations that are applied to a preliminary product, such as a protective or top coat.
  • the product is preferably made from three to twelve, preferably four to ten films.
  • the films can also carry printed layers. A laminate formed in this way can finally be coated on one or both sides with the protective or top coat or with a film.
  • the foil can be a volume hologram, a foil with a surface hologram (for example a kinegraphic element) or a scratch protection foil.
  • Overlay layers formed in this way protect a security feature arranged underneath and/or give the document the required abrasion resistance.
  • a value or security product 100 is shown which is shown as an example in the form of an identity card, which has been assembled, for example, as a laminate of several internal polymer layers.
  • the polymer layers can consist of PC and/or PET.
  • the individual layers can be unfilled or filled with fillers. In the latter case they are opaque, otherwise transparent.
  • the plies may preferably be bonded together to form a monolithic block that is practically impossible to split.
  • the identity card is equipped with security features 102, 104, which are in the form of an identigram (a registered trademark of the applicant).
  • security features 102, 104 which are in the form of an identigram (a registered trademark of the applicant).
  • identigram a registered trademark of the applicant.
  • the product of value or security 100 has an upper side which is opposite an underside.
  • the face or portrait of the card holder and some data fields containing personal or document-related content are located on the top.
  • the first security features 102 of the identity card are visible, since this valuable or security product 100 is irradiated from a first irradiation angle in such a way that the first security features 102 are reconstructed.
  • the valuable or security product 100 is irradiated with 45-degree grazing light from a first lighting device 212 .
  • second security features 104 are visible, since the value and security product 100 is illuminated at a second irradiation angle in such a way that the second security features 104 are reconstructed.
  • the irradiation takes place with a second illumination device 214 which emits a 0-degree coaxial light onto the upper side of the valuable or security product 100 .
  • a device 200 is used, which in figure 1 is shown.
  • figure 1 shows a device 200 for the optical detection of a value or security product 100 with a first security feature 102, which reconstructs at a first irradiation angle, and with a second security feature 104, which reconstructs at a second irradiation angle, which differs from the first irradiation angle.
  • the device 200 comprises an at least partially transparent support plate 200 on which the value or security product 100 can be placed.
  • the support plate 202 is preferably formed from transparent glass, so that it does not only appear partially transparent.
  • an optical detection device 204 in the present case in the form of a camera, whose lens uses a relatively small camera opening angle, as a result of which the longest possible optical path is created.
  • the length of the optical path is designed in such a way that the support plate 202 is captured completely under the opening angle of the camera. This is advantageous because the security features 102, 104 excited by the illumination are only visible within a limited angular range perpendicular to the surface. If this angle is exceeded, the contrast of the security features 102, 104 decreases and they are no longer so clearly visible in the edge areas.
  • the value or security product 100 is detected by the optical detection device 204 using a partially transparent mirror 206 .
  • This partially transparent mirror 206 comprises a front side 208 facing the support plate 202 and a rear side 210 facing away from the support plate 202. It is thus positioned in the beam path of the optical detection device 204 in order to prevent light impinging on it from the support plate 202 on its front side 208 in the direction of the optical Deflect detection device 204.
  • the two lighting devices 212, 214 are present, which emit light that is directed as strongly as possible.
  • Such a highly directional light comes about, for example, in that the lighting devices 212, 214 are formed from a light-emitting diode arrangement with a plurality of light-emitting diodes which have a narrow beam angle of between 5 degrees and 15 degrees, in particular a beam angle of 10 degrees.
  • the lighting devices 212, 214 can also be provided with a structured light guide.
  • the lighting devices 212, 214 or also the support plate 202 or also the lens of the optical detection device 204 can be covered with at least one contrast-enhancing film in order to make the holographic security features 102, 104 more clearly visible.
  • the beams of the two illumination devices 212, 214 can also be aligned by using an f-theta lens or an f-theta objective in the beam path of the illumination devices 212, 214. There is the possibility that the two lighting devices 212, 214 also emit light from a different wavelength range or different wavelengths.
  • the first illumination device 212 is set up to emit light at the first irradiation angle directly onto the support plate 202, with the second illumination device 214 being set up to emit light at the second irradiation angle onto the rear side 210 of the mirror 206, with this passing through the mirror 206 to the Front 208 is transmitted and thus passed to the platen 202.
  • the first illumination device 212 emits 45-degree grazing light 216, as a result of which the first security features 102 are reliably reconstructed.
  • the light rays thus impinge on the platen 202 at an angle of 45 degrees with respect to the surface normal of the platen 202 .
  • the second illumination device 214 emits 0-degree coaxial light 218, which impinges on the support plate 202 at an angle of 0 degrees with respect to the surface normal of the support plate 202.
  • the images of the value or security product 100 captured by the optical capture device 204 can be combined into a common image.
  • the generation of individual images is also possible and is advantageous for an evaluation of the holographic security features 102, 104.
  • the two lighting devices 212, 214 are preferably switched alternately.
  • the presently presented invention thus offers a solution for the optical examination of the holographic security features 102, 104, in particular the identigram (a registered trademark of the applicant) in part or fully automated way.
  • the mutual arrangement of the constituents of the present device 100 results in a particularly compact design and the available installation space in document checking devices is used sensibly.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Credit Cards Or The Like (AREA)
  • Holo Graphy (AREA)
EP22208103.6A 2021-11-24 2022-11-17 Dispositif et procédé de détection optique d'un produit de valeur ou de sécurité Pending EP4187512A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102021130723.6A DE102021130723A1 (de) 2021-11-24 2021-11-24 Vorrichtung und Verfahren zur optischen Erfassung eines Wert- oder Sicherheitsprodukts

Publications (1)

Publication Number Publication Date
EP4187512A1 true EP4187512A1 (fr) 2023-05-31

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EP22208103.6A Pending EP4187512A1 (fr) 2021-11-24 2022-11-17 Dispositif et procédé de détection optique d'un produit de valeur ou de sécurité

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EP (1) EP4187512A1 (fr)
DE (1) DE102021130723A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0722597B1 (fr) * 1993-10-06 1999-06-02 Minnesota Mining And Manufacturing Company Lecteur de securite pour la detection automatique de falsifications et d'alterations
US6998623B2 (en) * 2002-02-28 2006-02-14 Nidec Copal Corporation Sheets fluorescence detecting sensor
US20080265036A1 (en) * 2007-01-05 2008-10-30 Nordson Corporation Optical sensor for detecting a code on a substrate
DE102007052952A1 (de) 2007-10-31 2009-05-07 Bundesdruckerei Gmbh Verfahren und Vorrichtung zur Herstellung von Hologrammen mit wasserzeichenartiger Struktur

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6019287A (en) 1993-10-06 2000-02-01 3M Innovative Properties Company Security reader for automatic detection of tampering and alteration

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0722597B1 (fr) * 1993-10-06 1999-06-02 Minnesota Mining And Manufacturing Company Lecteur de securite pour la detection automatique de falsifications et d'alterations
US6998623B2 (en) * 2002-02-28 2006-02-14 Nidec Copal Corporation Sheets fluorescence detecting sensor
US20080265036A1 (en) * 2007-01-05 2008-10-30 Nordson Corporation Optical sensor for detecting a code on a substrate
DE102007052952A1 (de) 2007-10-31 2009-05-07 Bundesdruckerei Gmbh Verfahren und Vorrichtung zur Herstellung von Hologrammen mit wasserzeichenartiger Struktur

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Publication number Publication date
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