WO2005105476A1 - Caracteristique de securite pour un support de donnees, support de donnees correspondant et procede pour produire une caracteristique de securite - Google Patents

Caracteristique de securite pour un support de donnees, support de donnees correspondant et procede pour produire une caracteristique de securite Download PDF

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Publication number
WO2005105476A1
WO2005105476A1 PCT/EP2005/051768 EP2005051768W WO2005105476A1 WO 2005105476 A1 WO2005105476 A1 WO 2005105476A1 EP 2005051768 W EP2005051768 W EP 2005051768W WO 2005105476 A1 WO2005105476 A1 WO 2005105476A1
Authority
WO
WIPO (PCT)
Prior art keywords
carrier
security feature
area
substance
transparency
Prior art date
Application number
PCT/EP2005/051768
Other languages
German (de)
English (en)
Inventor
Andreas Deichsel
Oliver Muth
Manfred Paeschke
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
Priority to EP05731748A priority Critical patent/EP1740393B1/fr
Priority to DE502005001115T priority patent/DE502005001115D1/de
Priority to DK05731748T priority patent/DK1740393T3/da
Publication of WO2005105476A1 publication Critical patent/WO2005105476A1/fr

Links

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
    • B42D25/328—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
    • B42D25/333—Watermarks

Definitions

  • Security feature for data carrier corresponding data carrier and method for producing a security feature
  • the invention relates to a security feature for data carriers according to the preamble of claim 1.
  • the invention further relates to a corresponding data carrier and a method for producing such a security feature or such a part of a security feature according to the preamble of the further independent claims.
  • data carriers and security documents such as banknotes, ID cards, passports, check forms, admission tickets, tickets, receipts or other value and security documents are combined with data carriers.
  • a security feature for such data carriers makes it possible to determine whether the data carrier is genuine or counterfeit.
  • Watermarks are well-known and widely used security features for data media, made from paper.
  • An area on a data carrier is referred to as a watermark which reveals information to the viewer when looking through the data carrier against the light or against an area which is contrasting with the color of the data carrier. The information is not so clearly visible when the data carrier is viewed against a less contrasting surface or opposite to the light.
  • Images or patterns or letters or text or numbers or numbers or combinations of these elements are regarded as information.
  • Information in security features is read by the user or by a test device. The user or the device uses the information content to determine whether the data carrier is genuine or counterfeit.
  • the specialist concerned with security features differentiates between real watermarks and so-called chemical or pseudo-watermarks.
  • watermarks are created by elevations in a sieve by embossing in the still wet paper pulp, so that the paper becomes thinner and thus more transparent at this point.
  • This form of marking has been used since the Middle Ages to prove the authenticity of paper, since such watermarks can only be introduced originally in the manufacture of the paper. The manufacturing effort for such papers is very high.
  • a method for producing a chemical watermark and a corresponding security feature are described in the document EP 0 203 499 B1.
  • a heat-sensitive material for example a polyethylene polymer
  • a heat-applied die or stamp is pressed onto the mass at the points where the transparency of the paper is to be changed. It is pointed out here that the pressure with which the die or the stamp is pressed onto the paper should be very low in order to avoid larger notches on the surface of the paper.
  • a method for producing chemical watermarks is known from US Pat. No. 3,985,927, in which the substance producing the watermark is transferred to the paper by means of a stamp and is then treated with ultraviolet radiation.
  • the document US Pat. No. 6,358,596 B1 describes a method in which the surface of an impregnated substrate is produced by means of calenders or embossing dies to produce the Watermark is compressed. In the areas in which treatment is carried out using a calender or embossing die, there is a substance that increases the transparency of the substrate. Aftertreatment is carried out by means of electromagnetic radiation or thermally.
  • the publication US Pat. No. 6,630,055 B1 shows the production of a chemical watermark for paper, the chemical watermark locally changing the density, the thickness or the transparency of the paper.
  • the paper material is treated with a dampening solution, which is applied, for example, using an ink jet.
  • the solution is preferably hydrophilic or polar. After the solution has been applied, pressure and heat are applied to the substrate provided with the solution during a calendering step.
  • the document EP 0 540 455 B1 shows a paper carrier which is provided with a printing layer and an overlying plastic layer. A relief for a hologram or cylindrical lenses is engraved into the plastic layer. A lacquer or a thermoplastic resin is provided as the plastic layer.
  • Document US 4,933,120 also describes a hologram applied directly to a document. Here, a liquid resin is transferred onto the surface of the document by means of rollers, a relief being produced at the same time. In this case, too, electromagnetic radiation is used to harden the resin.
  • a two-part security feature for data carriers is described in the publication DE 19729 908 A1.
  • the security feature consists of a window and a part to be verified. Both parts of the security feature are located in different areas of the data carrier. After the window and the part to be verified have been placed on top of one another, the interaction of the two parts gives a statement as to whether the data carrier is genuine or counterfeit.
  • Such a security feature is also referred to as a self-verifying security feature, since one is required for verification separate verification device provided on the same or a different data carrier is required.
  • the invention is based on the object of specifying security features with a particularly high level of security against forgery, for example with respect to copying.
  • the security features should also be able to be produced without great effort, the production not being carried out in connection with the production of the carrier, but rather being connected downstream.
  • the security feature according to the invention is intended to form a unit with the carrier and not only, e.g. by gluing, to be connected to it only via a connection. Another task is to create particularly interesting and tamper-proof windows for self-verifying security features.
  • the invention is based on the further object of specifying corresponding data carriers with security features according to the invention and simple and inexpensive methods for producing such security features.
  • a security feature which additionally has a surface relief in an area which is provided with the transparency-changing substance, the surface relief representing at least a second piece of information or an optically effective verification element.
  • the object is further achieved by means of a data carrier which contains a security feature according to the invention.
  • the object is also achieved by a method according to the invention for producing a security feature, wherein after the application of a substance intended and intended to change transparency and curable to an area in the volume of the carrier, at least parts of the area are embossed and at the same time the substance is hardened to change the transparency takes place in the area, with at least one in the area by means of the transparency change generated by the substance first information and by means of the embossing at least a second piece of information or an optically effective verification element.
  • the carrier consists at least partially of cellulose.
  • the influencing of the transparency of the carrier is particularly pronounced.
  • the same advantage is achieved if the proportion of titanium dioxide as a filler is influenced.
  • the changes in transparency are particularly clearly visible if they reach a depth of at least 50 ⁇ m in the volume of the support.
  • the area with the change in transparency and the surface relief can also have a lacquer layer to protect the surface relief.
  • pigments which are colored or which luminesce when irradiated with electromagnetic radiation can be arranged in the carrier or in the substance which is provided for changing the transparency. This ensures an even higher level of security against forgery and / or the realization of a more appealing design is possible.
  • a particularly preferred embodiment of the invention relates to the design of the surface relief such that the light is diffracted from the surface structure by the relief in the manner of an embossed hologram so that when the diffracted light interferes in reflection or transmittance.
  • Such an embodiment produces a particularly forgery-proof security feature which is also particularly appreciated in design by the inexperienced user and is easily verifiable.
  • the surface structure is preferably designed as a lens structure, the lens structure serving to verify the second part of the security feature, which is arranged on the same or a different carrier.
  • the lens structure is easy to manufacture.
  • FIG. 1 shows a data carrier according to the invention with a security feature according to the invention in a view from above (schematically),
  • FIG. 2 shows a data carrier according to the invention and a security feature according to the invention in a cross section along the line A-A (schematic),
  • FIG. 3 shows a manufacturing method according to the invention using cross sections through the data carrier and the tool (schematically) and
  • Figure 4 excerpts from a security feature according to the invention (schematic).
  • FIG. 1 shows a data carrier according to the invention which has a carrier 1.
  • the carrier 1 is a sheet-like object, which is shown in the th embodiment has a rectangular shape and a thickness of a few microns to a few millimeters.
  • the carrier preferably has a thickness of approximately 20 ⁇ m to 900 ⁇ m.
  • the carrier 1 has a number of security features, for example printed letters which are provided with the reference number 3.
  • the carrier 1 is provided with a subsequently applied and curable substance which changes the transparency of the data carrier 1 in this area. A chemical watermark is therefore provided in the area.
  • the number "10" and a check pattern are represented by the change in transparency in area 5, the different shades of gray being intended to illustrate a different transparency.
  • the areas shaded in light gray are the numbers "1" and "0" and the edges of the squares are less transparent than the white areas shown here, or vice versa, compared to the other areas of area 5 shown in white, or vice versa.
  • the area 5 has a surface relief 7 in the darkly hatched areas, by means of which at least a second piece of information is represented.
  • the relief structures are, for example, micro-embossments that form holograms, diffractive structures or, in a further preferred exemplary embodiment, so-called kinegrams.
  • Kinegrams are holograms in which an apparent movement of an element of the hologram becomes visible when the wearer moves.
  • the embossments can also be in the form of micro-cylindrical lenses, Fresnel lenses or other optical microstructures. Sawtooth-like elevations and depressions are also possible as optically effective microstructures, which become visible when the carrier is tilted in different spatial directions.
  • an embossed hologram is implemented in the rectangular area with relief structure 7.
  • the image of a famous composer can be displayed in the hologram.
  • a matrix of 2 X 4 letters "a" is arranged, on the surface of which there is a micro-relief with a sawtooth structure. The letters are visible when the carrier is tilted.
  • Such a micro-relief or a hologram becomes also called optically variable feature (optical variable device) OVD, since the feature has a different appearance from different perspectives.
  • any other desired second information can also be implemented. It is preferably provided that at least parts of the first information and parts of the second information correspond to one another, so that there is redundancy, which leads to greater security against forgery.
  • the carrier 1 preferably consists of a proportion of cellulose. In a preferred embodiment, it can contain titanium dioxide as a filler.
  • the carrier 1 may also contain a proportion of plastic, for example synthetic binders in the form of aqueous polymer dispersions (for example polymers and copolymers of various monomers from the group styrene, butadiene, acrylic ester, vinyl acetate, acrylonitrile).
  • the cellulose can have been obtained from wood or cotton or other cellulose-containing natural substances.
  • Figure 2 shows a section through the data carrier 1 along the direction AA. It can be clearly seen that in the area 5 of the carrier 1, the volume of the carrier 1 is at least partially impregnated by the curable substance provided for the change in transparency. Penetration depths of the substances are, for example, at least 1 ⁇ m, preferably at least 50 ⁇ m. Reliefs 7 are formed on the surface of the carrier 1, which have the microstructures specified above.
  • FIG. 3 shows the method for producing a data carrier with a security feature according to the invention.
  • FIG. 3a shows the carrier 1 as the starting point, which can be in the form of a roll or sheet.
  • the carrier consists of an above-mentioned proportion of cellulose and is, for example, a paper carrier.
  • the carrier 1 can also contain a plastic specified above. If paper is used, it should not be laminated.
  • the paper may optionally contain titanium dioxide as a filler.
  • the paper is printed with a reactive mixture.
  • All printing methods can be considered as printing methods, namely high and low pressure, offset printing, flexographic printing or in particular digital printing, for example ink jet printing.
  • a certain amount of reactive substance must be applied to the surface. Such quantities should be in the range from 0.5 to 50 g / m 2 , preferably in the range of approximately less than 5 g / m 2 .
  • FIG. 3b schematically shows in a cross section that the carrier 1 is provided in the region 5 with a reactive and curable substance which penetrated the carrier 1 at least to a depth of 1 ⁇ m, preferably at least to a depth of 50 ⁇ m is.
  • Thermosetting resin mixtures (examples see US 3,441,427), radical-, cationic- or UV-curing substances (examples see US 3,985,927, US 6,103,355, US 6,143,120 and US 6,358,596), polyurethane mixtures (see DE 39 20 378) can be used as such a substance.
  • Substances with special solids and high-boiling solvents or plasticizers see US 4,919,044) or cellulose solvents (for example N-methylmorpholine-N-monoxide (NMMO) can be used.
  • the reactive substances can be provided with dyes, luminescent, thermochromic, electrochromic or photochromic pigments.
  • further features to be verified can be added to the security feature according to the invention. For example, if luminescent pigments are present in area 5 for verification of the security feature, the presence of the luminescence resulting from the luminescent pigments and the wavelength of the luminescence could also be checked.
  • Electromagnetic radiation is used to excite the luminescence and is applied to the region 5 by means of a laser, for example.
  • the next process step is shown schematically in FIG. 3c.
  • the carrier 1 provided with the reactive substance in the region 5 is placed between a stamp 10 and a die 11, the surface of the stamp 10 facing the carrier 1 having a relief 13.
  • Stamp 10 and die 11 are moved in the direction of carrier 1.
  • the directions of movement are identified by arrows 15 in FIG. 3c.
  • a pressure between about 5 to 100 bar, preferably from a few bar is applied to the carrier 1 in the region 5, i.e. exercised in the area provided with the reactive substance.
  • the result of this is that the relief 13 of the stamp 10 on the surface of the carrier 1 in the region 5 in which the reactive substance is contained in the volume of the carrier 1 produces a relief which corresponds to the negative of the stamp relief 13.
  • only the stamp 10 can also be moved in the direction of the carrier 1, while the die 11 remains at rest. Conversely, it is also possible to leave the stamp 10 alone and to move the die 11 in the direction of the carrier 1.
  • the stamp 10 and the stamp relief 13 and / or the die 11 may have to be designed such that they are transparent to the corresponding electromagnetic radiation.
  • the electromagnetic radiation can be generated, for example, by means of a laser of the appropriate wavelength or a mercury vapor lamp.
  • the reactive substance is hardened and / or crosslinked in region 5, so that, on the one hand, the desired changes in transparency are present in region 5, and the information explained with reference to FIG are.
  • the stamp relief 13 produces the desired surface relief 7 at least in partial areas of the area 5.
  • the stamp relief 13 is designed in accordance with the desired first and second information. If, as in the example in FIG. 1, a microrelief, which represents, for example, an embossed hologram, is to be realized only in partial areas of area 5, then the negative of this microrelief is only provided on the corresponding partial areas.
  • the remaining surface of the stamp 10, which corresponds to the extent of the area 5, has a plane which is in contact with the other areas of the area 5 or at least in the state, the action of heat and / or the electromagnetic radiation is only a short distance from them. In this way, heat and / or electromagnetic radiation can also act on the remaining areas of area 5 and the change in transparency for representing the first information can be generated accordingly.
  • the design of the first piece of information is determined by the print pattern.
  • the result of the last process step is shown in Figure 3d. It corresponds to FIG. 2.
  • the surface relief 7 in the area 5 contains at least one additional piece of information that can be used to verify the security feature in the area 5.
  • nickel shims are used as the stamp 10 in a preferred exemplary embodiment.
  • Such a nickel shim is designed to be heatable in order to achieve the heat input.
  • the stamp 10 can also be embodied as a quartz glass shim, which is characterized in that it is transparent to electromagnetic radiation, for example UV radiation, and thus enables the area 5 to be treated with electromagnetic radiation.
  • the microstructures can be provided with a suitable, transparent protective lacquer which protects the surface of the carrier 1 against mechanical influences, in particular abrasion.
  • protective lacquers include, in addition to the conventional protective lacquers, scratch-resistant lacquers “on a nano basis”, which are also used in automobile construction.
  • the present sheet or the roll from the carrier 1 with the security feature according to the invention is now processed further as usual 1 can, for example, be provided with further printing or glued-on security features, followed by a stamping step which serves to provide the carrier 1 with the desired dimensions.
  • a mixture of a melamine impregnating resin (Kauramin®-752, -753, -786 or -787, BASF) and a hardener (hardener 527, 529 for Kauramin® and Kaurit® impregnating resins) is placed on a carrier 1 via a flexographic printing unit.
  • a mixture of bifunctional and tri-functional acrylates for example SR-9003 and SR-415 from Sortomer, Laromer DP-DPGDA, Laromer-LR 8863, BASF
  • a photoinitiator Irgacure® 2020 , Irgacure® 819, Darocure® 1173, Ciba
  • UV radiation with a power density of more than 150 W / cm 2 is emitted through the quartz glass and the printed area 5 is cured.
  • a UV-curing scratch-resistant lacquer is then applied using a roller offset printing unit.
  • a coating or a varnish with high cohesion or scratch resistance can already be used when printing on the area 5, so that the sealing step is saved.
  • a solution of N-methylmorpholine-N-oxide (NMMO) in water is applied to the area 5 of the carrier 1 by means of an inkjet printer on a paper web or a paper sheet.
  • the embossing is then carried out with a nickel shim at temperatures below 100 ° C.
  • area 5 is sealed with a scratch-resistant lacquer.
  • aqueous solutions of NMMO dissolve or dissolve cellulose by softening the fiber structure, so that the cellulose is almost plastically deformable. The relationship between the dimensions of the change in transparency and relief height will now be discussed with reference to FIG. FIG.
  • FIG. 4a shows a section from area 5, in which the change in transparency is shown schematically by areas shaded in gray.
  • the extent d1 in which the change in transparency in the direction of the support surface has a specific, predetermined value, is shown with a double arrow.
  • the path length d1 changes the transparency from a specific, fixed, high value to a specific, fixed, low value.
  • the values are defined, for example, as the value of the highest transparency or as the value of the lowest transparency in the area 5.
  • Average dimensions d1 in the area 5 can be approximately 1 mm to 100 mm, preferably 5 mm to 30 mm.
  • FIG. 4b shows a section of the relief region 7 in a view from the side.
  • the extent d2 is entered in the direction of the support surface, which has a specific, predetermined change in relief height.
  • the extent d2 describes the distance between a location in which the relief has a certain large height and an adjacent location in which the relief has a predetermined low height.
  • Possible dimensions d2 are on average about 0.05 to 1 ⁇ m, preferably on average about 0.2 ⁇ m to 0.6 ⁇ m for holograms, kinegrams and other diffractive structures.
  • the expansion d2 is on average about 1 ⁇ m to 200 ⁇ m, preferably on average about 50 ⁇ m to 80 ⁇ m.
  • the average dimensions of the relief height change d2 are small compared to the average dimensions of the transparency changes d1.

Landscapes

  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Finance (AREA)
  • Credit Cards Or The Like (AREA)
  • Holo Graphy (AREA)
  • Collating Specific Patterns (AREA)
  • Air Bags (AREA)
  • Near-Field Transmission Systems (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

L'invention concerne une caractéristique de sécurité, un support de données correspondant et un procédé pour produire ladite caractéristique de sécurité, cette dernière présentant un support (1). Dans une zone (5) du support, des modifications de transparence dans les volumes du support (1) sont produites grâce à une substance ajoutée ultérieurement et pouvant durcir, grâce auxquelles une première information est représentée. Le relief de surface (7) est incrusté dans au moins une partie de la zone (5), une seconde information ou un élément de vérification agissant de manière optique étant représentés par le relief de surface.
PCT/EP2005/051768 2004-04-27 2005-04-21 Caracteristique de securite pour un support de donnees, support de donnees correspondant et procede pour produire une caracteristique de securite WO2005105476A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP05731748A EP1740393B1 (fr) 2004-04-27 2005-04-21 Caracteristique de securite pour un support de donnees, support de donnees correspondant et procede pour produire une caracteristique de securite
DE502005001115T DE502005001115D1 (de) 2004-04-27 2005-04-21 Sicherheitsmerkmal für datenträger, entsprechender datenträger und verfahren zur herstellung eines sicherheitsmerkmals
DK05731748T DK1740393T3 (da) 2004-04-27 2005-04-21 Sikkerhedsmærke for en databærer, en tilsvarende databærer og en fremgangsmåde til tilvejebringelse af et sikkerhedsmærke

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004020347 2004-04-27
DE102004020347.4 2004-04-27

Publications (1)

Publication Number Publication Date
WO2005105476A1 true WO2005105476A1 (fr) 2005-11-10

Family

ID=34965171

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2005/051768 WO2005105476A1 (fr) 2004-04-27 2005-04-21 Caracteristique de securite pour un support de donnees, support de donnees correspondant et procede pour produire une caracteristique de securite

Country Status (6)

Country Link
EP (1) EP1740393B1 (fr)
AT (1) ATE367938T1 (fr)
DE (1) DE502005001115D1 (fr)
DK (1) DK1740393T3 (fr)
ES (1) ES2289708T3 (fr)
WO (1) WO2005105476A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101419401B (zh) * 2008-11-17 2011-10-05 宁夏金世纪包装印刷有限公司 多级隐含图像防伪工艺

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1286309A (en) * 1968-11-21 1972-08-23 Antonius Kufferath Use of stereoscopic pictures for the protection of documents and the like
EP0540455A1 (fr) * 1991-10-28 1993-05-05 Palmira Gili Picoy Procédé pour préparer les feuilles imprimées avec effets optiques
WO2000045344A1 (fr) * 1999-01-26 2000-08-03 The Governor And Company Of The Bank Of England Substrats pour impression
WO2004008397A1 (fr) * 2002-07-17 2004-01-22 Oesterreichische Banknoten- Und Sicherheitsdruck Gmbh Document de securite

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1286309A (en) * 1968-11-21 1972-08-23 Antonius Kufferath Use of stereoscopic pictures for the protection of documents and the like
EP0540455A1 (fr) * 1991-10-28 1993-05-05 Palmira Gili Picoy Procédé pour préparer les feuilles imprimées avec effets optiques
WO2000045344A1 (fr) * 1999-01-26 2000-08-03 The Governor And Company Of The Bank Of England Substrats pour impression
WO2004008397A1 (fr) * 2002-07-17 2004-01-22 Oesterreichische Banknoten- Und Sicherheitsdruck Gmbh Document de securite

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101419401B (zh) * 2008-11-17 2011-10-05 宁夏金世纪包装印刷有限公司 多级隐含图像防伪工艺

Also Published As

Publication number Publication date
DK1740393T3 (da) 2007-10-22
EP1740393A1 (fr) 2007-01-10
ES2289708T3 (es) 2008-02-01
ATE367938T1 (de) 2007-08-15
DE502005001115D1 (de) 2007-09-06
EP1740393B1 (fr) 2007-07-25

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