EP3279004A1 - Élément de sécurité, procédé de fabrication d'un élément de sécurité ainsi que document de valeur pourvu d'un tel élément de sécurité - Google Patents

Élément de sécurité, procédé de fabrication d'un élément de sécurité ainsi que document de valeur pourvu d'un tel élément de sécurité Download PDF

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Publication number
EP3279004A1
EP3279004A1 EP17001244.7A EP17001244A EP3279004A1 EP 3279004 A1 EP3279004 A1 EP 3279004A1 EP 17001244 A EP17001244 A EP 17001244A EP 3279004 A1 EP3279004 A1 EP 3279004A1
Authority
EP
European Patent Office
Prior art keywords
substrate
radiation
watermark
laser
thickness
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.)
Withdrawn
Application number
EP17001244.7A
Other languages
German (de)
English (en)
Inventor
André Gregarek
Patrick Renner
Annett Bähr
Georg Depta
Veronika RACK
Harald Reiner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Giesecke and Devrient Currency Technology GmbH
Original Assignee
Giesecke and Devrient Currency Technology 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 Giesecke and Devrient Currency Technology GmbH filed Critical Giesecke and Devrient Currency Technology GmbH
Publication of EP3279004A1 publication Critical patent/EP3279004A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/41—Marking using electromagnetic radiation
    • 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
    • B42D25/24—Passports
    • 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
    • B42D25/333—Watermarks
    • 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
    • B42D25/351—Translucent or partly translucent parts, e.g. windows
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/378—Special inks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/378—Special inks
    • B42D25/382—Special inks absorbing or reflecting infrared light
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/378—Special inks
    • B42D25/387—Special inks absorbing or reflecting ultraviolet light
    • 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
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/425—Marking by deformation, e.g. embossing

Definitions

  • the invention relates to a method for producing a security element, which comprises the steps of providing a substrate which has a watermark varying the thickness of the substrate and a laser-radiation-sensitive substance, and irradiating a portion of the substrate which overlaps with the watermark with specific radiation.
  • the invention further relates to a security element which comprises a substrate with a watermark varying the thickness of the substrate and a laser-radiation-sensitive substance.
  • the invention relates to a security element, which is produced by the method described above, and a value document, which comprises such a security element.
  • the object of the invention is to provide a security feature, a value document and a method for producing a security element, wherein the security element also has a watermark and a matching halftone or gray-scale image, the production of which is particularly simple.
  • a method for producing a security element which comprises the following steps: providing a substrate which has a watermark varying a thickness of the substrate and a laser-radiation-sensitive substance; and irradiating a portion of the substrate which overlaps with the watermark with certain radiation; wherein the laser-radiation-sensitive substance is distributed over the thickness in a volume of the substrate, so that a color effect is generated in the register to the watermark; and wherein the thickness varying due to the watermark produces a locally varying amount of color effect.
  • the color effect generated is inseparably connected to the substrate, so that manipulation without damage, such as by replacing the in the EP 2817155 B1 described laser radiation-sensitive layer, are not possible.
  • the image produced by the color effect is exactly in the register to the watermark, so that a counterfeit security level similar to that in the EP 2817155 B1 level described. This results from the fact that the laser-radiation-sensitive substance is distributed in the substrate. By applying the specific radiation and its interaction with the laser radiation-sensitive substance, the substrate is colored.
  • the color effect becomes stronger, the thicker the substrate is at the corresponding point, since there are on average more laser-radiation-sensitive Substance for coloring the substrate is present than at a comparable location with a smaller thickness of the substrate.
  • the more laser-sensitive substance was excited to color the substrate the stronger is the color effect produced thereby.
  • an image produced on the basis of the color effect can be recognized, which has the same color levels or gray levels as the watermark and is exactly in register with the watermark.
  • the watermark is colored in transparency due to the color effect.
  • color also refers to achromatic effects, so z.
  • B halftone, grayscale or black and white images.
  • the security element may be a data carrier, such as a security thread, a label, a transfer element or a security print.
  • the substrate may be configured as any thin-surface element, into which a watermark varying the thickness of the substrate can be introduced.
  • the substrate may be a paper, in particular a cotton paper.
  • the paper may contain a proportion x polymer material in the range of 0 ⁇ x ⁇ 100% by weight, preferably 5 ⁇ x ⁇ 20% by weight.
  • the substrate can be a paper-foil composite or a film composite in which the substrate is embedded between two film layers.
  • the material of the substrate is optionally opaque in areas where no watermark is provided, where opaque in the sense of this application is understood as meaning a material which transmits a maximum of 5%, in particular a maximum of 2%, of the visible light.
  • the watermark used for the security element of this invention can be seen by a variation of the thickness of the substrate.
  • the watermark may be generated in the manufacture of the substrate, by embossing the substrate during or after fabrication of the substrate, or by local ablation, particularly laser ablation or milling. Due to the varying thickness of the substrate, a varying volume per unit area of a surface of the substrate results.
  • the particular radiation used to irradiate a portion of the substrate has such a wavelength, intensity, fluence or polarization that a color effect is established in the substrate, that is, the substrate colors.
  • the particular radiation can be applied by a single beam.
  • the intensity of the radiation is constant over the extent of the beam.
  • the extension of the beam can be formed by optical elements, so that the color effect has a certain outline, which can serve as a further security feature.
  • the portion of the substrate is processed by scanning a beam with respect to the surface area of the small-size portion, in particular, a laser beam.
  • the portion of the substrate may be any area of the substrate. However, it is provided to produce a varying color effect that overlaps the portion with the watermark; with no overlap of the portion with the watermark, a constant color effect is applied to a region of the homogeneous thickness substrate during constant intensity irradiation.
  • the material of the substrate is preferably designed such that it becomes more opaque with increasing thickness, ie, less and less incident radiation is transmitted, and translucent at a small thickness appears. For substrates having a large thickness compared to a penetration depth of the particular radiation into the substrate, only one of the surfaces of the substrate near the surface of the substrate may be discolored. It is preferred that the thickness of the substrate change in such a way due to the watermark that the edge layer of the substrate which is discolored by the specific radiation is varied in its thickness.
  • a paper is used as a substrate to produce the color effect, and the laser-radiation-sensitive substance absorbs the specific radiation while generating heat in such a way that the paper is carbonized.
  • carbonization is the thermal decomposition of hydrocarbons contained in the paper.
  • the substances contained in the paper and the paper itself can also absorb radiation to generate heat, however, it is preferred that in addition to the conventional production of the paper used, the laser radiation-sensitive substance is added, so that the absorption of the particular radiation increases and thus locally such heat is generated that the carbonization of the paper is induced.
  • the laser-radiation-sensitive substance is titanium dioxide (TiO 2 ).
  • the laser-radiation-sensitive substance is optionally distributed in the paper such that a homogeneous discoloration of the paper results due to the irradiation of the particular radiation.
  • the carbonization turns the paper black or blackish in a variant; the more laser-sensitive substance is present in the paper and the stronger the fluence and / or the duration of the irradiation is at a given location, the darker the paper will discolor at the appropriate location.
  • gray levels can be created in the paper become.
  • the varying thickness provides for homogeneous irradiation to a corresponding thickness of the substrate discoloration of the substrate.
  • a laser-radiation-sensitive dye is used to produce the color effect as a laser-radiation-sensitive substance. This changes its color when the radiation falls.
  • the dye which is sensitive to laser radiation before being activated is colorless, ie the paper has its natural color and is colored, for example blue, red or green, when the substrate is irradiated with the specific radiation.
  • Laser radiation sensitive dyes having the above properties are known in the art.
  • further discoloration may be produced in a third stage with third stage laser radiation.
  • Such a dye is used in the EP 2528742 B1 described, which is hereby incorporated into the disclosure. With the help of this dye not only grayscale, but also color effects with different colors can be generated and thus generate color images. Furthermore, laser-sensitive dyes can be used which are visible after irradiation with the particular ultraviolet or infrared radiation. Such security features are then recognizable only with the help of technical devices.
  • the introduction of the laser-radiation-sensitive substance can take place in a variant in that the laser-radiation-sensitive substance is mixed in the preparation of the substrate with its starting materials. If, for example, paper is used as the substrate, the laser-radiation-sensitive Substance be added to the headbox in the trough of a paper machine. The addition of the laser-radiation-sensitive substance can take place in each process step in the production of the substrate; this means that the laser-radiation-sensitive substance is added before the substrate is completed.
  • Another possibility for introducing the laser-radiation-sensitive substance into the substrate is to mix the laser-radiation-sensitive substance with a liquid with which the substrate is impregnated.
  • the substrate is so impregnated with the liquid that the laser radiation-sensitive substance is evenly distributed in the substrate.
  • a gradient in the distribution of the laser radiation-sensitive substance due to the soaking in the substrate is established; the density of the laser-radiation-sensitive substance is thus higher on a surface of the substrate than in the middle or on the opposite side of the substrate.
  • a gradient in the density of the laser-sensitive substance is not much affected when the change in density in the areas where the thickness of the substrate changes is small.
  • the laser-radiation-sensitive substance is added to a glue which is applied to the substrate.
  • the specific radiation is applied only to a front side of the substrate in such a way that the color effect is greater in plan view on the front side than in a top view of a back side of the substrate. Due to a certain opacity of the substrate or the fact that the opacity of the substrate increases due to the color effect, it is possible with a suitable choice of the fluence and / or duration of the irradiation with the particular radiation to make the color effect on the front side more pronounced as on the back of the substrate. This is because a fluence of the particular radiation in a layer adjacent to the front surface of the substrate is stronger than in a layer adjacent to a back surface of the substrate.
  • the color effect produced is higher in the layer near the front than in the layer near the back.
  • the color effect is more pronounced when viewed from the front side than at the rear side.
  • Front and back of each image is recognizable, which is identical to the gray scale gradient of the watermark and with the watermark in perfect registration, since both sides of the substrate are irradiated with the same irradiation.
  • Front and back can also be understood as the first and second side; Thus, they do not designate a particular side of the security element, but only two opposing sides of the substrate.
  • the material of the substrate, the laser-radiation-sensitive substance, the fluence of the specific radiation and / or the irradiation time is selected such that the substrate is dyed uniformly along its thickness.
  • the color effect produced in this way is thus identical in supervision of the front and on the back.
  • a fluence and / or an irradiation duration of the applied specific radiation over the substrate is varied in a pattern such that the pattern can be seen in plan due to the intensity of the color effect in the substrate .
  • the local increase in the fluence and / or the duration of irradiation produces a stronger color effect, since either more laser-radiation-sensitive substance contributes to the color effect or the discoloration is stronger.
  • the pattern used may be, for example, a lettering, a character, a letter or the like.
  • the determined radiation is applied in a planar manner with a first fluence and a second, stronger fluence is applied to the substrate in the region of the pattern, so that the substrate in the region of the pattern turns darker.
  • the particular radiation may be scanned across the substrate, whereby by varying the scan speed, the irradiation time at a particular location may be increased, and by varying the intensity or by varying the focusing of the particular radiation, the fluence of the particular radiation may be varied can.
  • a diode laser with one line of laser light sources may be used.
  • the variation of the irradiation parameters may also be such that gray levels, i. H. produce different degrees of discoloration, regardless of the watermark in the substrate. In this way, it is possible to produce grayscale images in the substrate. This grayscale image may be superimposed with the watermark. Optionally, it is possible for the watermark and grayscale image to complement each other to form an overall picture.
  • the particular radiation is applied only over a portion of the watermark. For example, only half of the watermark is irradiated with the particular radiation. Furthermore, it is possible that sections of the watermark targeted be irradiated so that certain features of the watermark in color stand out in color or complement the colored areas of the substrate by the watermark to a total picture when changing from supervision to review. Furthermore, it is possible for the specific radiation to be applied in a planar manner, the colored area only partially overlapping with the watermark. All the variants described have in common that the applied color effect is varied by the varying thickness due to the watermark and is exactly in register with the watermark. As described, color images are also possible.
  • the specific radiation is applied at least to the entire watermark.
  • the grayscale image of the watermark can be seen by looking through the highlighted color effect.
  • the outline of the inked surface of the substrate may be selected as an outline of a person, an animal or an object.
  • the outline of the colored area may have a geometric shape, for example a quadrilateral, a triangle or the like.
  • a security element which comprises a substrate having a watermark varying a thickness of the substrate and a substance sensitive to laser radiation.
  • the laser-radiation-sensitive substance is distributed over the thickness in a volume of the substrate.
  • a portion of the substrate which overlaps with the watermark is colored at least in a layer below a front surface of the substrate due to the laser radiation sensitive substance, so that the thickness varying due to the watermark produces a locally varying amount of discoloration in the register to the watermark.
  • the object is further achieved by a security element made according to the method as described above and by a value document comprising a security element as described above.
  • Fig. 1a shows a section of a value document 10.
  • the value document 10 is for example a banknote and comprises a security element 12.
  • the security element 12 has a substrate 14, a watermark 16 and a halftone or gray scale image 18.
  • the substrate 14 can be made of paper, in particular of cotton paper, and forms an integral unit for the document of value 10 and the security element 12.
  • a laser-radiation-sensitive substance is distributed, preferably evenly, due to their small size in Fig. 1 not shown.
  • the laser-sensitive substance can absorb a certain radiation to generate heat, so that the substrate 14 is carbonized and darkened therewith.
  • the laser-radiation-sensitive substance may be, for example, titanium dioxide (TiO 2 ).
  • the laser-radiation-sensitive substance can have a laser-radiation-sensitive dye or pigments which discolors on irradiation with the particular radiation.
  • the watermark 16 is in the FIGS. 1 to 3 illustrated embodiment formed by two rectangles with in review different brightness. This is especially in Fig. 2 can be seen in which the halftone or gray scale image 18 is not yet provided.
  • the watermark 16 can be introduced, for example, by embossing before or after the production of the substrate 14 or by laser ablation or by milling. As this particular in 4 and 5 can be seen, the substrate 14 in the region of the watermark 16 has a smaller thickness d1 than in the region of the substrate 14, in which no watermark 16 is provided; There, the substrate 14 has the thickness d2.
  • the see-through watermark 16 results from a changed thickness of the substrate 14, whereby the translucency of the substrate 14 is changed locally.
  • the watermark 16 may be in addition to the in Fig. 2 shown two-stage training with a rectangular contour have any shape and thickness variation as known in the art.
  • the specific radiation applied homogeneously.
  • the section 20 partially overlaps, in Fig. 3
  • the volume per area of a front side of the security element 12 that is inked becomes less pronounced , differently. Due to the different colored volume results in a different degrees of discoloration of the substrate 14 in the section 20, as in Fig. 3 can be recognized by the different density hatching. If the substrate 14 has the thickness d2-the greatest thickness-the darkest discoloration results there, as indicated by the hatching. If the substrate 14 has the thickness d1 which is smaller than the thickness d2, a less pronounced coloration results.
  • the thickness of the substrate 14 is thinner than the thickness d1, an even lighter discoloration results.
  • a part of the watermark 16 is thus visible in the contone caused color in the halftone or gray scale image 18, as shown in Fig. 3 is recognizable.
  • the halftone or gray scale image 18 can be configured as desired in its shape. In Fig. 1a the half-tone or gray-scale image 18 only covers part of the watermark 16.
  • the watermark 16 and the halftone or grayscale image 18 can be seen.
  • the watermark 16 is colored in the region of the portion 20, wherein the discoloration depends on the thickness of the substrate 14 at the respective location; in Fig. 1a are the different ones Shades schematically represented by the density of the hatching.
  • FIG Fig. 1b Another embodiment of the value document 10 and thus of the security element 12 is shown in FIG Fig. 1b shown.
  • the security element 12 agrees with the security element 12 in Fig. 1a match, except that additionally a pattern 22 has been introduced.
  • This pattern 22 shows the outline of a crescent, but may also include any other shape, such as a lettering, a letter or a number.
  • the pattern 22 results from the fact that the fluence of the particular radiation or the residence time of the particular radiation in the region of the pattern 22 is greater, so that the substrate 14 becomes more discolored in the region of the pattern 22. In the embodiment shown, the discoloration is so strong that the thickness of the substrate 14 has no influence on the discoloration of the substrate 14.
  • the pattern 22 is thus above the watermark 16, ie the substrate 14 with the thickness d1, discolored the same as the substrate 14 with the thickness d2.
  • the fluence and the irradiation time are chosen such that the pattern 22 shows a stronger color effect than the rest of the inked area, but at the same time shows a variation of the color effect depending on the thickness of the substrate 14.
  • the fluence and / or irradiation time of the particular irradiation may be selected such that, as in Fig. 4 shown, the substrate 14 in the portion 20 in which the particular radiation was irradiated, is uniformly colored.
  • the fluence and / or the duration of irradiation can be chosen such that, depending on the depth in the substrate 14, different discolorations of the substrate 14 occur, as shown schematically in FIG Fig. 5 is shown. This is due to the fact that the substrate 14 may have its own opacity or due to the already colored
  • the opacity of the substrate 14 increases, whereby the discoloration on the side of the substrate 14 on which the radiation enters is stronger than on the opposite side of the substrate 14.
  • the halftone or greyscale image 18 can be on a front side of the substrate 14 to be colored darker than on a back side of the substrate 14. This represents another security feature of the security element 12.
  • the gradual nature of the discoloration shown depending on the thickness of the substrate 14 may also be gradual.
  • a like in Fig. 5 the course of the discoloration is also adjusted by impregnating the substrate 14 with a liquid containing the laser-radiation-sensitive substance.
  • the density of the laser-radiation-sensitive substance it is possible for the density of the laser-radiation-sensitive substance to be dependent on the thickness d1, d2, since the impregnation does not make the density of the laser-radiation-sensitive substance homogeneous, but depends on a distance from the surface. If the substrate 14 is irradiated with homogeneous radiation, even in its thickness, the change in the density of the laser-radiation-sensitive substance results in the Fig. 5 schematically indicated discoloration course.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
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EP17001244.7A 2016-08-04 2017-07-20 Élément de sécurité, procédé de fabrication d'un élément de sécurité ainsi que document de valeur pourvu d'un tel élément de sécurité Withdrawn EP3279004A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102016009512.1A DE102016009512A1 (de) 2016-08-04 2016-08-04 Sicherheitselement, Verfahren zum Herstellen eines Sicherheitselements sowie Wertdokument mit einem solchen Sicherheitselement

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EP3279004A1 true EP3279004A1 (fr) 2018-02-07

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EP17001244.7A Withdrawn EP3279004A1 (fr) 2016-08-04 2017-07-20 Élément de sécurité, procédé de fabrication d'un élément de sécurité ainsi que document de valeur pourvu d'un tel élément de sécurité

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DE (1) DE102016009512A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3785927A1 (fr) * 2019-08-27 2021-03-03 Veridos GmbH Document d'identification de type livre

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009003587A1 (fr) * 2007-07-03 2009-01-08 Giesecke & Devrient Gmbh Signe de sécurité et son procédé de réalisation
WO2009127325A1 (fr) * 2008-04-16 2009-10-22 Giesecke & Devrient Gmbh Procédé de fabrication d’un document de sécurité ou de valeur
WO2010072329A1 (fr) * 2008-12-22 2010-07-01 Giesecke & Devrient Gmbh Support de données à zone transparente
WO2011089447A1 (fr) * 2010-01-25 2011-07-28 Datalase Limited Appareil d'impression sans encre
EP2439074A2 (fr) * 2010-10-08 2012-04-11 Giesecke & Devrient GmbH Papier de sécurité doté de filigranes
WO2013124059A1 (fr) * 2012-02-21 2013-08-29 Giesecke & Devrient Gmbh Procédé avec alignement entre un élément d'impression et un filigrane

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009003587A1 (fr) * 2007-07-03 2009-01-08 Giesecke & Devrient Gmbh Signe de sécurité et son procédé de réalisation
WO2009127325A1 (fr) * 2008-04-16 2009-10-22 Giesecke & Devrient Gmbh Procédé de fabrication d’un document de sécurité ou de valeur
WO2010072329A1 (fr) * 2008-12-22 2010-07-01 Giesecke & Devrient Gmbh Support de données à zone transparente
WO2011089447A1 (fr) * 2010-01-25 2011-07-28 Datalase Limited Appareil d'impression sans encre
EP2528742B1 (fr) 2010-01-25 2015-10-07 Datalase Limited Appareil d'impression sans encre
EP2439074A2 (fr) * 2010-10-08 2012-04-11 Giesecke & Devrient GmbH Papier de sécurité doté de filigranes
WO2013124059A1 (fr) * 2012-02-21 2013-08-29 Giesecke & Devrient Gmbh Procédé avec alignement entre un élément d'impression et un filigrane
EP2817155B1 (fr) 2012-02-21 2016-06-22 Giesecke & Devrient GmbH Procede avec alignement entre un element d'impression et un filigrane

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EP3785927A1 (fr) * 2019-08-27 2021-03-03 Veridos GmbH Document d'identification de type livre

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