EP3529084B1 - Procédé de fabrication d'un élément de sécurité - Google Patents

Procédé de fabrication d'un élément de sécurité Download PDF

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Publication number
EP3529084B1
EP3529084B1 EP17791574.1A EP17791574A EP3529084B1 EP 3529084 B1 EP3529084 B1 EP 3529084B1 EP 17791574 A EP17791574 A EP 17791574A EP 3529084 B1 EP3529084 B1 EP 3529084B1
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EP
European Patent Office
Prior art keywords
laser
substrate
color
laser beams
substance
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP17791574.1A
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German (de)
English (en)
Other versions
EP3529084A2 (fr
Inventor
André Gregarek
Christian Fuhse
Steffi JAHN
Veronika RACK
Patrick Renner
Georg Depta
Josef Schinabeck
Annett Bähr
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
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Giesecke and Devrient Currency Technology GmbH
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Publication of EP3529084A2 publication Critical patent/EP3529084A2/fr
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Publication of EP3529084B1 publication Critical patent/EP3529084B1/fr
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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
    • B42D25/30—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
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • 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
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/41—Marking using electromagnetic radiation

Definitions

  • the invention relates to a method for producing a security element with a tilt image and a security element with a tilt image.
  • a tilted image is generally only visible to the viewer from a given viewing angle range and is not visible from other viewing angles.
  • DE 102014016009 A1 describes a method for producing a security element with one or more tilt images.
  • Microlenses are applied to a metallization layer.
  • the metallization layer is removed through the microlenses, so that a substrate lying under the metallization layer can only be seen from a predetermined viewing angle which corresponds to the angle of the laser ablation.
  • a laser beam with a scanning speed of 200 mm / s is guided over an optical film with a lens structure, microimages and one or more laser-sensitive layers.
  • U.S. 4,032,691 and DE 33 11 882 call laser-sensitive substances.
  • DE 85 29 297 U1 relates to an identity card with a lens structure and a laser-sensitive layer, the color of which can optionally be changed. To generate a tilted image with 3 partial images, a pulsed laser beam is guided over the lenses and activated three times per lens.
  • DE 85 29 297 U1 shows the preamble of claim 1.
  • the invention is based on the object of providing a method for producing a security element so that a tilted image for the security element is obtained particularly easily.
  • a method for producing a security element with a tilt image comprises the following steps: providing a substrate which has an area with a substance that can be modified by laser radiation; Forming a plurality of microstructures on the substrate, wherein the microstructures are each designed such that they focus radiation incident on a front side of the substrate into the region; and irradiating a set of parallel laser beams onto the microstructures at a first angle to the substrate, so that a structure of a first tilted image is generated, which can be seen from the front side at a viewing angle range associated with the first angle, the substance comprising a laser radiation-sensitive dye which changes its color when exposed to certain laser radiation, and wherein the first tilt image shows a color effect caused by the change in color.
  • the parallel laser beams are controlled individually, in particular with regard to fluence and / or irradiation duration.
  • the number of juxtaposed laser beams in the set is selected so that the structure of the tilt image is generated (or specified) simultaneously in at least one dimension, such as width or length.
  • a security element not claimed comprises a substrate and a multiplicity of microstructures which are formed on the substrate and which focus radiation incident on a front side of the substrate into an area.
  • the area has a dye that is sensitive to laser radiation.
  • the area is colored in a large number of colored sections and the microstructures are each designed in such a way that they focus radiation incident on the front side at a given viewing angle range on the colored sections, so that a first tilted image can be recognized through the microstructures in the given viewing angle range .
  • a security element can be produced according to the method mentioned.
  • the security element can be provided for a carrier, such as a document of value, that is to say, for example, applied to the carrier or integrated into the carrier.
  • the security element can also be produced on the carrier, such as a bank note or an object to be secured.
  • the carrier accordingly comprises the security element. Any object that is to be protected from counterfeiting can be designed as a carrier.
  • a preferred advantage of the invention is that the microstructures are used both for applying the first tilted image to the substrate and for viewing the first tilted image. Because the first tilt image is generated by irradiating the substrate via the microstructures and the microstructures focus incident radiation onto the substrate, a color change in the substrate induced by the set of laser beams is smaller than an extension of the individual laser beams of the set. The substrate is only colored in areas in order to generate a color effect of the first tilt image. The first tilt image is formed with gaps in the substrate, which is why the first tilt image can only be seen from the front under a specific first viewing angle range.
  • the first viewing angle range can extend in an angular range of ⁇ 3 °, ⁇ 7 °, ⁇ 15 ° or ⁇ 30 ° around the first angle.
  • the color changes in the substrate some of which are also referred to as color-changed sections, form the structure of the tilt image on the substrate.
  • the use of a dye that is sensitive to laser radiation makes the production of the first tilt image particularly easy, since the local dyeing by means of such a dye is associated with less effort than when removing a metal layer. It is particularly the case with the method described here it is not necessary to apply a metal layer and remove it again at the appropriate points.
  • the production of the security element thus requires fewer process steps than that in FIG DE 102014016009 A1 described method for producing a tilt image.
  • only a monochrome tilted image can be generated through the known local removal of a metal layer. Another advantage is the possibility of producing brightness level or true color images.
  • the plurality of microstructures can first be formed on the substrate and then the laser radiation-sensitive dye can be introduced into the substrate or applied to the substrate.
  • the security element can be a (data) carrier for verification of authenticity, such as a security thread, a label, a transfer element or a security print.
  • the substrate can be designed as any desired thin-surface element that is suitable for supporting the multitude of microstructures.
  • the substrate can be a paper, in particular a cotton paper, or a film made of polyethylene (PE), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN), polypropylene (PP) or polyamide (PA).
  • the paper can contain a proportion x of synthetic polymer materials in the range of 0 ⁇ x ⁇ 100% by weight.
  • the film can be stretched monoaxially or biaxially.
  • the stretching of the film leads, among other things, to the fact that it acquires polarizing properties that can be used as a further authenticity feature.
  • the aids required to utilize these properties, such as polarization filters, are known to the person skilled in the art.
  • the substrate can be a paper film composite or a film composite in which the substrate and the multitude of microstructures are embedded between two film layers.
  • the substrate can be transparent, translucent or opaque.
  • opaque is understood to mean a material which transmits a maximum of 5%, in particular a maximum of 2%, of the visible light.
  • Transparent or translucent in the sense of the application is understood to mean that a material transmits at least 50%, in particular between 70%, preferably 90%, and 100%, of the visible light.
  • Transparent and translucent materials differ in that an image can be seen through the transparent material - the image information is retained after passing through the transparent material - this is not the case with a translucent material - the image information is lost through the translucent material due to scattering .
  • the laser radiation-sensitive dye can optionally be applied as a layer to the substrate or be provided in the substrate as a layer.
  • the laser radiation sensitive dye changes its color when it is irradiated with the specific laser radiation.
  • the properties of the specific laser radiation can relate to the wavelength of the laser radiation, the intensity of the laser radiation or the polarization of the laser radiation.
  • the parallel laser beams are controlled individually, in particular with regard to fluence and / or irradiation duration.
  • the arrangement of the individual parallel laser beams of the set of parallel laser beams produces the local structuring of the color change of the substrate.
  • the set of parallel laser beams can be generated, for example, by an array of lasers, such as a diode laser bar or a diode laser stack.
  • the lasers are preferably arranged as a row arranged next to one another.
  • the lasers are more preferably present in two or more rows arranged next to one another.
  • the individual lasers of this diode laser array can be switched on or off individually, or the intensity of the radiation to be emitted can be controlled individually.
  • such a diode laser array has a resolution of 200 dpi to 500 dpi.
  • the arrangement of the set of parallel laser beams can be adjusted and different tilt images can thus be generated.
  • one diode laser in each case generates one laser beam of the set of parallel laser beams.
  • the first angle of the direction of incidence of the set of parallel laser beams can be set by the spatial arrangement of the laser sources or by deflecting the laser radiation by means of mirrors. The first angle is z. B. measured with respect to a normal to the substrate.
  • the multitude of microstructures focuses the incident radiation on the substrate.
  • the individual microstructures can be designed as microlenses or micro-concave mirrors.
  • the microstructures can be designed as circular, elliptical or oval structures with a cross section perpendicular to the normal or as linear elements for focusing the laser radiation. Accordingly, the substrate has a linear color change when linear microstructures are used and a lattice-like color change when circular, oval, or elliptical microstructures are used.
  • the number of microstructures is optionally greater than the number of laser beams, so that a laser beam (from a single diode laser) strikes several microstructures.
  • the single laser beam of the set is larger in extent than the microstructure. This has the advantage that the individual laser beams do not have to be precisely aligned with the respective microstructures, but rather a laser beam always completely illuminates at least one microstructure due to the large extent of the individual laser beams compared to the diameter of the microstructures. In this way it can be ensured that every laser beam causes a discoloration on the substrate.
  • the number of juxtaposed laser beams in the set is selected so that the structure of the tilt image is generated (or specified) simultaneously in at least one dimension, such as width or length. Ideally, sufficient laser beams are provided over a large area so that the entire structure of the tilt image can be generated (or specified) by the sentence.
  • the tilt image can also be generated in partial images.
  • a series of juxtaposed laser beams can be used that extend over one dimension of the tilt image (such as width or length of the tilt image) in order to generate the tilt image in the corresponding other dimension (length or width) in partial images one after the other.
  • Two rows of parallel laser beams are particularly preferably used in the set, the two rows (in the sense of an overall denser beam arrangement) being offset from one another by half a laser beam width.
  • the microlenses can be applied to a film or formed in one piece with a film; the film can be applied to the substrate to form the microstructures on the substrate.
  • the microlenses can be made of a transparent material such as polyethylene (PE), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN), polypropylene (PP) or polyamide (PA).
  • the area in which the laser radiation-sensitive dye is provided can extend over the entire substrate or only be a partial area of the substrate.
  • the area can have an outline that matches the outline of the first tilt image. This means that the area in which the laser radiation-sensitive dye is provided corresponds approximately to the extension of the tilt images to be applied.
  • the laser beams of the set have the specific laser radiation, a fluence of the specific laser radiation and / or an irradiation duration per unit area being set locally differently.
  • the color of the tilt image is preferably changed locally differently, that is, it contains a color effect.
  • the fluence can be changed by varying the intensity of the individual laser beams in the set or by differently focusing the individual laser beams in the set.
  • the duration of the irradiation can be changed by switching on the individual laser beams of the set for different lengths of time.
  • a larger or smaller proportion of the laser radiation-sensitive dyes is activated per unit volume, as a result of which a different degree of color change can be produced.
  • the present color change can be a monochrome color change, for example a change in brightness and / or color saturation.
  • the color change can include a color change, that is to say, for example, a change in the color value.
  • the tilt image contains a gradual (or gradual) change in color, which is preferably a chromatic color.
  • the generation of the first tilt image can comprise at least two steps of irradiating laser beams. Radiation of the set of parallel laser beams is one of the two steps, but not necessarily the first of those steps.
  • the wavelength of the laser radiation can differ for the at least two steps of irradiation.
  • the at least two steps can also take place from different sides of the security element.
  • the at least two steps can be carried out for different purposes: color change of the substance, activation of the substance for a subsequent color change, deactivation of the substance to prevent a color change.
  • the procedure according to the invention can also be used with a laser radiation-sensitive dye which changes its color in several stages.
  • a laser-sensitive substance known that is colored with a multi-stage, here a three-stage process.
  • Two-stage systems are also known to the person skilled in the art, so that in a further development It is preferred that the color of the laser radiation-sensitive dye can be changed in a modification process comprising at least two stages, with laser radiation being irradiated in both stages and the stages differing in terms of a wavelength of the laser radiation.
  • the laser radiation for the two stages can be generated with a laser array which has two different laser diodes for each laser beam, so that each laser beam of the set can comprise two wavelengths. By switching on the laser diodes of the laser array accordingly, a multicolored image can be generated.
  • one of the two Stages activate the substance and the other of the two stages causes the substance to change color.
  • the in the EP 2528742 B1 described dye can be used.
  • a near-infrared or infrared wavelength can be used to activate the dye in the first stage, for example an Nd: YAG laser with a wavelength of 1.064 ⁇ m.
  • the color change of the second stage can be generated with laser radiation in the ultraviolet wavelength range, for example with an excimer laser.
  • both the structure and the intensity of the color change can be established by means of the activation, in that, as described above, the fluence and / or the irradiation time of the laser beams are / is varied to activate the laser radiation-sensitive dye; a larger or smaller proportion of the laser radiation-sensitive dye is thus activated.
  • the second stage for changing the color of the substance can then be irradiated with laser radiation that is homogeneous over the region, since the degree of the color change was determined by the variation in the activation.
  • the fluence and irradiation duration of the laser beams of the first stage for activating the laser radiation-sensitive dye are kept constant.
  • the variation of the color effect is produced in that the fluence and / or the irradiation time of the laser beams of the second stage are / is set differently in order to produce local color differences.
  • the focal length of the microstructures for the activation and the color change is different, so that guiding the laser beams of the first stage and the second stage through the microstructures leads to a longitudinal color error can.
  • the further laser radiation can be generated, for example, by the diode laser array which generates the set of laser beams and whose radiation is directed onto the rear side by means of mirrors.
  • a further diode laser or an array of diode lasers can be used to generate the further laser radiation.
  • the further laser radiation can be a single laser beam, by means of which the entire area or a part of the area in which the laser radiation-sensitive dye is provided is illuminated.
  • the further laser radiation is homogeneous in the area in which the laser radiation-sensitive dye is provided. This variant can be used in particular when a variation in the intensity is set by means of the set of laser radiation in the first stage.
  • the laser radiation-sensitive dye also has a third stage which enables a further color change of the substance.
  • the third stage is activated by additional laser radiation, which is optionally radiated onto the front side of the substrate through the microstructures.
  • the additional laser radiation can, for example, have a wavelength in the near infrared or in the infrared.
  • the laser radiation for the third stage is overlapping or equal to the wavelength range of the laser radiation of the first stage, so that the focus shift caused by the differences in the wavelength of the laser radiation is small.
  • the laser radiation for the first stage and the laser radiation for the third stage can preferably be applied through the microstructures.
  • the further laser radiation for the third stage can be applied as homogeneous laser radiation.
  • the laser diode array can generate two different wavelengths for each laser beam, for example, by coupling two laser diodes in such a way that they emit a laser beam.
  • the variation of the color change in the third stage can be caused by the fact that the fluence and / or the irradiation time vary / varies in the first stage and the third radiation is irradiated homogeneously or that the laser beams of the first stage are homogeneous and the fluence and / or the irradiation time for the laser radiation of the third stage can / will be varied according to the tilted image.
  • the fluence and / or the irradiation duration for the third and / or second stage are set in such a way that per Microstructure on the substrate creates a gradual color change.
  • a Gaussian intensity profile of the incident radiation results due to the optical laws. If the fluence of the laser beams and / or the duration of the irradiation are selected for the third and / or second stage in such a way that the color change in the third stage is caused depending on the Gaussian distribution on the substrate, the color changes for each microstructure according to the Gaussian distribution.
  • a section that has been changed in color therefore has a gradual change in color (not a uniform color, as previously described, but). This is achieved in that, depending on the Gaussian distribution, the fluence and / or the irradiation time are / is above or below a threshold value for color change. This creates an optical impression in which, if the viewing angle is identical or almost identical to the first angle of the incident laser radiation for the third and / or second stage, the through the third and / or second color level is visible color change in the first image.
  • Such or a similar second or third step of irradiating laser radiation can also take place with the aim of improving the visibility of the tilted image.
  • Another, in particular coloring, laser irradiation step can lead to an increased width of the color-changed section by slightly varying the wavelength (e.g. + - 5 (or 10) nm) and / or the angle of incidence (e.g. + - 0.5 (, 1 or 2) degrees) .
  • An increased width of the color-changed sections increases the angular range in which the tilted image is visible.
  • the intensity distribution within a laser beam can also be varied to produce the above-mentioned effect.
  • this is particularly advantageous if the change in intensity in the focus caused by the focusing turns out to be small.
  • Such color changes which are dependent on the viewing angle, are particularly desirable in the case of tilt images that represent symbols, letters or characters.
  • the change in the color of the first tilt image depending on the viewing angle can represent a security feature of the security element.
  • a further development provides that a second tilt image is generated by irradiating a group of parallel laser beams at a second angle to the substrate on its front side.
  • the second tilt image can optionally be identical to the first tilt image, so that identical tilt images can be seen from two viewing angles.
  • the tilted image is visible in a first viewing angle range, then invisible and again identically visible in a second viewing angle range.
  • This can be implemented, for example, in that the set of parallel laser beams and the group of parallel laser beams are generated by the same laser diode array and are directed onto the substrate at different angles by means of a beam splitter or mirror.
  • the second tilt image can be seen from the front at a second viewing angle range corresponding to the second angle.
  • a third tilt image or further tilt images can be generated analogously.
  • a second (third or further) tilt image is generated with a second (third or further) laser diode array.
  • the second (or any further) tilt image can be different from the first tilt image.
  • the second, third or any further tilt image can be generated in a similar manner to the first tilt image.
  • the considerations, preferred further developments and advantages put forward with regard to the first tilt image can be applied analogously.
  • the second tilt image can be set in such a way that, with increasing viewing angle, first the first tilt image under a first color, then under a second color, then the second tilt image under the first color and then the second tilt image can be seen under the second color.
  • the second tilt image can also be generated with a diode laser array that differs from the diode laser array for generating the set of parallel laser beams.
  • the first tilt image and the second tilt image can optionally be generated simultaneously.
  • the set of laser radiation and the group of laser beams are irradiated simultaneously.
  • the methods described above for generating the first tilt image and the second tilt image can be used. Since the color change of the laser radiation-sensitive dye usually brings little or no heat generation with it, the first tilt image and the second tilt image can be generated simultaneously without causing thermal damage to the substrate.
  • the forgery-proof security element can be further increased by combining a regular image with a tilt image to form an overall structure.
  • the microstructures only cover part of the area with the laser-radiation-modified substance, the set of parallel laser beams being irradiated onto the entire area with the laser-radiation-modifiable substance.
  • the regular image can be seen from the front side next to the first tilt image and is under one opposite the first and / or second viewing angle range larger viewing angle range visible.
  • the viewing angle for the regular image is optionally 50%, 100%, 200% or 500% larger than the first and / or second viewing angle range.
  • a tilted image that merges into a regular image could possibly also be reproduced by other means.
  • an imprint by means of a blind effect e.g. by applying a film with directed lamellas
  • a different motif that only supplements or belongs to the tilted image is preferably shown in the regular image (distinguishable partial images).
  • a blind foil could hardly be applied to an imprint with such, distinguishable partial images with the required registration accuracy. Therefore, as already described, a second (third or further) tilt image is particularly preferably generated by means of the microstructures. Sections of different tilt images are thus located under a single microstructure. For the viewer, the tilt images are (at least overlapping) in the same place. Generating a second tilt image for the viewer at the same place is not possible with the technologies available to a forger using blinds.
  • the microstructures can for example be applied to a carrier film or formed in a carrier film, the carrier film being arranged on the part of the area with the substance that can be modified by laser radiation.
  • the carrier film can be strip-shaped. If the set of laser beams is then irradiated onto the area with the laser radiation-sensitive substance, a tilted image is created in the section in which the microstructures are arranged, and in the section in which the microstructures are arranged are not arranged, a regular image visible from many viewing angles. Since the tilt image and the regular image are generated with the same set of parallel laser beams, they are in perfect register with each other. It is possible that the section of the area in which the tilted image is provided is additionally illuminated with the group of parallel laser beams for generating the second tilted image.
  • the laser radiation-sensitive dye is distributed over a volume of the substrate.
  • the laser radiation-sensitive dye can be mixed with its starting products during the production of the substrate. If z. If, for example, paper is used for the substrate, the laser-radiation-sensitive dye can be added to the headbox in the trough of the paper machine. It is also possible to add the laser radiation-sensitive dye to a liquid, for example a glue, with which the paper is impregnated. In both cases, the laser-sensitive dye is firmly bonded to the paper, so that deliberate or inadvertent separation of the tilt image from the substrate is impossible.
  • the substrate can comprise a plurality of partial regions which comprise the substance which can be modified by laser radiation.
  • the microstructures are present in the first partial area and a regular image can be generated in a second partial area without microstructures.
  • the subregions of the substrate can comprise different or the same substrate material.
  • the substrate can comprise a plastic film in the first partial area and a paper substrate in the second partial area.
  • the same substance that can be modified by laser radiation can be introduced into the subregions at different times.
  • the first partial area is particularly preferably a part of an independent security feature, such as a thread, strip or the like, which is embedded in a carrier substrate, in particular paper.
  • the embedded security feature for example as a pendulum thread, preferably forms the surface of the carrier only in partial areas.
  • the value document 10 can be, for example, a bank note and comprises a security element 12.
  • a regular image 16 can be seen on a substrate 14 of the security element 12 in plan view.
  • the regular image 16 is in the Figs. 1 and 2 Shown as a triangle or section of a square, but can represent any motif, for example an outline of a person, an animal, an object or a symbol.
  • the regular image 16 can be seen from a large viewing angle range, for example from 0 ° to 70 ° or 80 ° relative to a normal, in a plan view of the value document 10, as in FIG Figures 1b and 1c is shown.
  • a first tilt image 18 can be seen in addition to the regular image 16.
  • the first viewing angle range is significantly smaller than the viewing angle range of the regular image 16.
  • the first viewing angle range can be ⁇ 3 °, ⁇ 7 °, ⁇ 15 ° or ⁇ 30 ° of the first angle ⁇ .
  • the first tilt image 18 is in Figure 1b shown as a square, which complements the regular image 16 to form an overall image, the regular image 16 and the first tilt image 18 being in perfect register with one another.
  • a second tilt image 20 can be seen which, like the first tilt image 18, is in perfect register with the regular one Picture 16 stands.
  • the second viewing angle range can be ⁇ 3 °, ⁇ 7 °, ⁇ 15 ° or ⁇ 30 ° of the second angle ⁇ .
  • the first tilt image 18 and / or the second tilt image 20 can have any shape in addition to the illustrated rectangles and in particular represent people, objects or animals.
  • the overall image is a coat of arms and the tilting images 18, 20 represent parts of the coat of arms that can be recognized from the respective viewing angle.
  • the first tilt image 18 and / or the second tilt image 20 can / can as in FIG Fig. 2 shown, are composed of non-contiguous sections, which optionally complement the regular image 16 to form an overall image.
  • the sections of the tilt image can be formed, for example, in the respectively visible parts of a pendulum thread in the value document.
  • FIG Fig. 3-6 The structure, the production method and the mode of operation of the document of value 10 or of the security element 12 are illustrated in FIG Fig. 3-6 explained.
  • the value document can also be viewed as a security element in the broader sense.
  • the illustrated embodiment of the security element 12 has a color layer 22 with laser radiation-sensitive dyes contained therein, an optional carrier layer 24 and a multiplicity of microstructures 26.
  • the substrate 14 is made of paper, in particular cotton paper.
  • the substrate 14 can also be produced from a film.
  • the color layer 22 is part of the substrate 14 in which the laser radiation-sensitive dye is distributed.
  • the color layer 22 it is also possible for the color layer 22 to be a layer applied separately to the substrate 14.
  • the laser-sensitive dye is a dye that changes color depending on the fluence of the incident radiation and the duration of the exposure.
  • the carrier layer 24, on which the microstructures 26 are formed, is applied to the substrate 14 or the color layer 22.
  • the carrier layer 24 consists of a transparent film, for example made of polyethylene (PE) or polypropylene (PP).
  • the microstructures 26 are designed as, optionally circular, microlenses and, in the embodiment shown, are produced in one piece with the carrier layer 24. However, it is also possible for the multiplicity of microstructures 26 to be produced separately and applied to the carrier layer 24.
  • the microstructures 26 are also made of a transparent material, for example polyethylene (PE) or polypropylene (PP).
  • the microstructures 26 lie in a plane above the area of the substrate 14 in which the laser radiation-sensitive dye is provided.
  • the in Figure 2 The illustrated subsections of the tilt image 18 can be implemented by different configurations.
  • the microstructure 26 is only present in the subsections; per subsection is in the sense of Figure 3 a film element 24 with microstructures 26 is applied to the substrate 14.
  • the microstructures 26 on the carrier layer 24 are embedded in the substrate 14.
  • the microstructures can optionally be as shown in FIG Figure 2 as a pendulum thread, embedded in the substrate.
  • a substrate can thus comprise partial regions made of different substrate materials, which are optional can be provided with laser radiation-active dyes, possibly in a color layer, at different times.
  • the production of the document of value 10 or the security element 12 is as follows: First, in the area of the regular image 16 and the later first tilted image 18, the laser radiation-sensitive dye is introduced into the substrate 14, for example by soaking the substrate 14 with a liquid, like glue, which contains the laser radiation sensitive dye. In this way, the color layer 22 is provided with an extent which corresponds to the later regular image 16 and the first tilt image 18.
  • the carrier layer 24 with the plurality of microstructures 26 arranged thereon is applied in the region of the first tilt image 18 and the second tilt image 20. Subsequently, a set 28 of laser beams is irradiated at a first angle ⁇ with respect to a normal to the substrate 14.
  • the individual laser beams of the set 28 have an extent which is greater than a diameter of the microstructures 26, so that a laser beam of the set 28 falls on a plurality of microstructures 26.
  • the individual laser beams of the set 28 have an arrangement and an intensity such that the regular image 16 and the first tilted image 18 result therefrom by placing in the color layer 22 at the points where the set 28 of laser beams hit the color layer 22 hits, a color change occurs.
  • the individual laser beams of the set 28 have the same intensity and the same exposure time, so that the regular image 16 and the first tilted image 18 appear as homogeneous surfaces.
  • the laser beams of the set 28 are spaced from one another, there is no continuous color change in the color layer 22.
  • the focusing of the laser beams of the set 28 through the microstructures 26 results in colored sections 30 in the color layer 22 with a width b. In between there are non-colored sections 32 in the colored layer 22, in which no color change was caused.
  • the security element 12 If the security element 12 is now viewed from the front at a viewing angle which is approximately equal to the first angle ⁇ , radiation that originates from the colored sections 30 is fed to the viewer's eye. The first tilt image 18 can thus be seen. If the security element 12 is viewed from the front from a viewing angle that differs from the first angle ⁇ , the radiation entering the viewer's eye comes from the non-colored sections 32, so that the first tilt image 18 cannot be seen. Only the color of the uncolored substrate 14 is visible or the basic color of the laser-sensitive layer, which can certainly have its own color. Since no microstructure 26 is arranged above the regular image 16, the regular image 16 can be seen from all viewing angles.
  • the generation and the mode of operation of the second tilt image 20 are analogous to the first tilt image 18, except that to generate the second tilt image 20 a group 34 of laser beams is radiated at a different, second angle ⁇ , as shown in FIG Fig. 5 is shown.
  • a group 34 of laser beams is radiated at a different, second angle ⁇ , as shown in FIG Fig. 5 is shown.
  • the group 34 of laser beams With the group 34 of laser beams, a region of the substrate 14 different from the colored sections 30 is colored. The irradiation of the group 34 of laser beams can occur simultaneously with that of the set 28 of laser beams or one after the other.
  • FIG Fig. 4 A further embodiment of the value document 10 or security element 12 is shown in FIG Fig. 4 shown. This is true except for the following differences with the value document 10 according to Fig. 3 agree:
  • the microstructures 26 are in the in Fig. 4
  • the embodiment shown is designed as a micro-concave mirror, which focuses incident laser beams onto the color layer 22.
  • the color layer 22 is in the in Fig. 4
  • the embodiment shown is provided separately from the substrate 14 and can, for example, be designed as a film into which laser-sensitive dye is mixed.
  • the mode of operation and production method is analogous to that in Fig. 3
  • the value document 10 shown is analogous to that in Fig. 3
  • the value document 10 shown is analogous to that in Fig. 3
  • the value document 10 shown shown.
  • the laser-sensitive dye of the colored layer 22 and / or the laser radiation are adapted in such a way that the laser-sensitive dye does not react to the unfocused radiation, that is to say is transparent to it. Only the radiation focused by the microstructures creates the color change.
  • Fig. 5 shows an enlarged illustration of a further embodiment of the value document 10.
  • the embodiment according to FIG Fig. 5 agrees with the embodiment according to Fig. 3 except for the following difference:
  • the laser radiation-sensitive dye is in accordance with the embodiment Fig. 5 distributed completely in the substrate 14, so that no separate color layer 22 is formed.
  • the colored section 30 extends further into the substrate 14.
  • Fig. 6 shows a further embodiment of the value document 10 or security element 12, which with the Fig. 3 and 5 embodiment shown matches.
  • a laser radiation-sensitive dye is used here, the color of which can be changed in a modification process comprising at least two stages.
  • the set 28 of laser beams is irradiated through the microstructures 26 at the first angle ⁇ .
  • the wavelength of the laser radiation is, for example, in the infrared, in particular 1.064 ⁇ m.
  • the laser radiation for the first stage is used to activate the laser radiation-sensitive dye.
  • laser radiation is now radiated with a wavelength different from the set 28 of laser radiation, for example with a wavelength in the ultraviolet.
  • the laser radiation for the second stage is not radiated from a front side of the substrate 14 but from a rear side.
  • the intensity of the laser radiation for the second stage is homogeneous over the area of the regular image 16 and the first tilted image 18.
  • the set 28 of laser beams is modified accordingly for the first stage in order to generate different color tones (gray levels) and structures.
  • the substrate and / or the wavelength of the laser radiation radiated in from the rear are selected such that the substrate is sufficiently transparent for the laser radiation.
  • a third stage (or a third step of irradiating laser radiation) for generating a further color effect in the case of the laser radiation-sensitive dye according to the embodiment of FIG Fig. 6 to be provided.
  • laser radiation with a wavelength that is similar to the wavelength for the first stage is used.
  • the laser radiation for the third stage can therefore be irradiated again through the microstructures 26, in particular again at the first angle ⁇ .
  • the fluence and the duration of the irradiation of the laser-sensitive dye for the (second or) third stage are particularly preferably selected such that the color change within (each) of the colored section 30 is different.
  • This can be caused, for example, by the fact that, due to the focusing by the microstructures 26, there is a Gaussian intensity distribution in the color layer 22 or in the substrate 14 results.
  • there is a gradual color change in the colored section 30 the color of the color change of the (second or) third stage in the middle of the colored section 30 and no color change resulting from this stage at the edges of the colored section 30.
  • Figure 6 accordingly, only the color of the second stage of the color change is present at the edges of the respectively colored sections 30.
  • the first tilted image 18 with the color for the second stage can be recognized.
  • the color gradually changes from the color of the second level to the color of the third level.

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  • Physics & Mathematics (AREA)
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  • Manufacturing & Machinery (AREA)
  • Credit Cards Or The Like (AREA)
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  • Semiconductor Integrated Circuits (AREA)

Claims (12)

  1. Procédé de fabrication d'un élément de sécurité (12) ayant une première image à basculement (18), comprenant les étapes :
    - mise à disposition d'un substrat (14) qui comporte une zone ayant une substance modifiable par rayonnement laser,
    - formation d'une pluralité de microstructures (26) au substrat (14), les microstructures (26) étant respectivement formées de telle façon qu'elles focalisent dans la zone un rayonnement incident sur une face avant du substrat (14), et
    - génération d'une structure de la première image à basculement (18), de telle sorte que la première image à basculement (18) est reconnaissable dans une première zone d'angle d'observation de la face avant, cependant que
    la substance comporte un colorant sensible au rayonnement laser, lequel modifie sa couleur par irradiation avec un rayonnement laser déterminé, et
    la première image à basculement (18) montre un effet de couleur conditionné par la modification de la couleur,
    caractérisé en ce que
    la génération de la première image à basculement (18) comprend une irradiation simultanée d'un jeu (28) de rayons laser parallèles sur les microstructures (26) sous une premier angle (α) par rapport au substrat (14),
    les rayons laser parallèles sont contrôlés individuellement, et
    dans le jeu (28) de rayons laser, suffisamment de rayons laser sont agencés les uns à côté des autres afin de générer entièrement la structure de l'image à basculement dans au moins une dimension telle que la largeur ou la longueur.
  2. Procédé selon la revendication 1, caractérisé en ce que les rayons laser parallèles sont contrôlés individuellement quant à la fluence et/ou la durée d'irradiation.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que les rayons laser individuels du jeu (28) présentent une étendue plus grande qu'une microstructure (26).
  4. Procédé selon une des revendications de 1 à 3, caractérisé en ce que la génération de la première image à basculement (18) comprend au moins deux étapes d'application de rayonnement de rayons laser y compris l'application de rayonnement du jeu (28) de rayons laser parallèles.
  5. Procédé selon la revendication 4, caractérisé en ce que, à chacune des au moins deux étapes d'application de rayonnement, une des étapes partielles suivantes de a à d a lieu : a) une première modification de couleur de la substance, b) une deuxième modification de couleur de la substance, c) une activation de la substance ou une d) désactivation de la substance.
  6. Procédé selon la revendication 4 ou 5, caractérisé en ce que, pour les au moins deux étapes d'application de rayonnement, la longueur d'onde du rayonnement laser se différencie, cependant qu'en particulier une première longueur d'onde déterminée est prévue pour une première modification de couleur, et une deuxième longueur d'onde déterminée est prévue pour une deuxième modification de couleur.
  7. Procédé selon une des revendications de 4 à 6, caractérisé en ce qu'au moins l'étape de l'application de rayonnement du jeu (28) a lieu depuis la face avant, et qu'une autre des au moins deux étapes a lieu depuis la face arrière.
  8. Procédé selon une des revendications de 1 à 7, caractérisé en ce que les rayons laser du jeu (28) ont le rayonnement laser déterminé et engendrent la modification de couleur de la substance suivant la structure, cependant que, de préférence, une fluence du rayonnement laser déterminé et/ou la durée d'irradiation sont/est réglée(s) localement différemment par unité de surface.
  9. Procédé selon une des revendications de 1 à 7, caractérisé en ce
    que le jeu (28) de rayons laser engendre une activation de la substance suivant la structure, et que, lors d'une deuxième étape de l'application de rayonnement, pour la modification de couleur de la substance activée, le rayonnement laser est appliqué sur une face arrière du substrat (14) et/ou que le jeu (28) de rayons laser engendre une désactivation de la substance à l'extérieur de la structure et que, lors d'une deuxième étape de l'application de rayonnement, pour la modification de couleur de la substance, du rayonnement laser est appliqué.
  10. Procédé selon une des revendications de 1 à 9, cependant qu'une deuxième modification de couleur de la substance est engendrée lors d'une deuxième et/ou troisième étape de l'application de rayonnement laser, lequel est appliqué sur la face avant du substrat (14), cependant que, de préférence, la fluence et/ou la durée d'irradiation sont réglées de telle façon pour la deuxième modification de couleur que, par microstructure sur le substrat (14), une modification graduelle de couleur est générée.
  11. Procédé selon une des revendications précédentes, caractérisé en ce qu'une deuxième image à basculement (20), visible depuis la face avant sous une deuxième zone d'angle d'observation - correspondant à un deuxième angle (β) - est générée, ce qui a lieu en ce qu'un deuxième jeu (34) de rayons laser parallèles est appliqué sous le deuxième angle (β) sur le substrat (14), cependant que le premier jeu (28) de rayons laser parallèles et le deuxième jeu (34) sont de préférence appliqués en même temps.
  12. Procédé selon une des revendications précédentes, caractérisé en ce que les microstructures (26) recouvrent une partie de la zone ayant la substance modifiable par rayonnement laser, cependant que - de préférence le jeu (28) de rayons laser parallèles - est appliqué sur une autre partie de la zone ayant la substance modifiable par rayonnement laser, de telle sorte que, depuis la face avant, à côté de la première image à basculement (18), une image régulière (16), reconnaissable dans une zone d'angle d'observation plus grande par rapport à la première zone d'angle d'observation, est visible.
EP17791574.1A 2016-10-21 2017-10-19 Procédé de fabrication d'un élément de sécurité Active EP3529084B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016012625.6A DE102016012625A1 (de) 2016-10-21 2016-10-21 Sicherheitselement und Verfahren zum Herstellen eines Sicherheitselements
PCT/EP2017/001226 WO2018072881A2 (fr) 2016-10-21 2017-10-19 Élément de sécurité et procédé de fabrication d'un élément de sécurité

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EP3529084A2 EP3529084A2 (fr) 2019-08-28
EP3529084B1 true EP3529084B1 (fr) 2021-01-06

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CN (1) CN109562635B (fr)
DE (1) DE102016012625A1 (fr)
WO (1) WO2018072881A2 (fr)

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DE102018118473A1 (de) * 2018-07-31 2020-02-06 Bundesdruckerei Gmbh Lichtsteuerfolie, Dokument mit einer Lichtsteuerfolie und Verfahren zur Herstellung eines Dokumentes mit einer Lichtsteuerfolie
DE102018007207B4 (de) 2018-09-12 2020-10-01 Giesecke+Devrient Mobile Security Gmbh Sicherheitsdokument und Verfahren zur Herstellung eines Sicherheitsdokuments
EP3766702A1 (fr) * 2019-07-15 2021-01-20 Giesecke+Devrient Currency Technology GmbH Élément de sécurité et son procédé de fabrication
EP4031380B1 (fr) * 2019-09-20 2023-07-26 Giesecke+Devrient Currency Technology GmbH Procédé de fabrication d'un élément de sécurité et élément de sécurité
DE102019007417A1 (de) 2019-10-24 2021-04-29 Giesecke+Devrient Currency Technology Gmbh Sicherheitselement mit maschinenlesbarem IR-Code
DE102019007418A1 (de) 2019-10-24 2021-04-29 Giesecke+Devrient Currency Technology Gmbh Sicherheitselement und Wertdokument mit visuell und maschinell prüfbaren Sicherheitsmerkmalen, die in räumlicher Beziehung zueinander stehen
DE102021002214A1 (de) * 2021-04-27 2022-10-27 Giesecke+Devrient Mobile Security Gmbh Sicherheitsmerkmal für ein Wertdokument, Wertdokument und Verfahren zur Herstellung eines Sicherheitsmerkmals

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DE3311882A1 (de) * 1983-03-31 1985-02-07 Carl Baasel Lasertechnik GmbH, 8000 München Materialstueck aus aluminium, vorzugsweise aluminiumschild und verfahren zur herstellung desselben
DE8529297U1 (fr) * 1985-10-15 1987-12-17 Gao Gesellschaft Fuer Automation Und Organisation Mbh, 8000 Muenchen, De
GB2477139A (en) * 2010-01-25 2011-07-27 Datalase Ltd Inkless printing apparatus
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DE102014016009A1 (de) 2014-10-28 2016-04-28 Giesecke & Devrient Gmbh Verfahren zum Herstellen eines Sicherheitselements mit einem Linsenrasterbild

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Publication number Publication date
CN109562635B (zh) 2021-07-20
DE102016012625A1 (de) 2018-04-26
WO2018072881A2 (fr) 2018-04-26
CN109562635A (zh) 2019-04-02
WO2018072881A3 (fr) 2018-06-14
EP3529084A2 (fr) 2019-08-28

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