WO2018072881A2 - Élément de sécurité et procédé de fabrication d'un élément de sécurité - Google Patents

Élément de sécurité et procédé de fabrication d'un élément de sécurité Download PDF

Info

Publication number
WO2018072881A2
WO2018072881A2 PCT/EP2017/001226 EP2017001226W WO2018072881A2 WO 2018072881 A2 WO2018072881 A2 WO 2018072881A2 EP 2017001226 W EP2017001226 W EP 2017001226W WO 2018072881 A2 WO2018072881 A2 WO 2018072881A2
Authority
WO
WIPO (PCT)
Prior art keywords
laser
image
substrate
radiation
laser beams
Prior art date
Application number
PCT/EP2017/001226
Other languages
German (de)
English (en)
Other versions
WO2018072881A3 (fr
Inventor
André Gregarek
Christian Fuhse
Steffi JAHN
Veronika RACK
Patrick Renner
Georg Depta
Josef Schinabeck
Annett Bähr
Original Assignee
Giesecke+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+Devrient Currency Technology Gmbh filed Critical Giesecke+Devrient Currency Technology Gmbh
Priority to CN201780044412.7A priority Critical patent/CN109562635B/zh
Priority to EP17791574.1A priority patent/EP3529084B1/fr
Publication of WO2018072881A2 publication Critical patent/WO2018072881A2/fr
Publication of WO2018072881A3 publication Critical patent/WO2018072881A3/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
    • B42D25/30—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 tilting image and a security element with a tilting image.
  • Various variants are known to provide tilting images in security elements for value documents, such as banknotes.
  • a tilted image is visible to the viewer only 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.
  • a metallization microlenses are applied.
  • the metallization layer is removed through the microlenses, so that a substrate lying below the metallization layer can only be seen at a predetermined viewing angle, which corresponds to the angle of the laser ablation.
  • the invention has for its object to provide a method for producing a security element, a security element and a corresponding device for manufacturing, so that a tilting image for the security element is particularly easily obtained.
  • a method for producing a security element with a tilted image comprises the following steps: providing a substrate having a region with a laser-radiation-modifiable substance; Forming a plurality of microstructures on the substrate, the microstructures each being configured to focus radiation incident on a front surface 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 as to produce a structure of a first tilt image that is recognizable from the front side at a viewing angle range associated with the first angle, wherein the
  • Substance has a laser-sensitive dye, which changes its color by irradiation with certain laser radiation, and wherein the first tilting image shows a caused by the change of color color effect.
  • a security element comprises a substrate and a multiplicity of microstructures, which are formed on the substrate and focus radiation incident on a front side of the substrate into a region.
  • the area has a laser-radiation-sensitive dye.
  • the area is colored in a plurality of colored sections in such a way and the microstructures are each designed such that they focus radiation incident on the front side over a defined viewing angle range on the colored sections, so that a first tilted image in the predetermined viewing angle range can be recognized by the microstructures ,
  • a security element can be produced by the said method.
  • the security element can be provided for a carrier, such as a value document, that is, for example, applied to the carrier or integrated into the carrier.
  • the security element can be produced on the carrier, such as banknote or item to be secured.
  • the carrier comprises the security element.
  • any object may be formed, which is to be protected against counterfeiting.
  • 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.
  • the first tilt image By producing the first tilt image by irradiating the substrate over the microstructures and the microstructures focusing incident radiation onto the substrate, a color change in the substrate induced by the set of laser beams is less than an extension of the individual laser beams of the set.
  • the substrate is only partially colored to produce a color effect of the first tilted image.
  • the first tilt image is formed with gaps in the substrate, for which reason the first tilt image can only be seen from a certain first viewing angle range from the front side.
  • the first viewing angle range may extend within an angular range of ⁇ 3 °, ⁇ 7 °, ⁇ 15 ° or ⁇ 30 ° about the first angle.
  • the color changes in the substrate which are sometimes referred to as color-changed sections, form the structure of the tilt image on the substrate.
  • the use of a laser-sensitive dye makes the production of the first tilted image particularly simple, since the local dyeing by means of such a dye is associated with less effort than in the removal of a metal layer. In particular, in the case of the method described here, It is not necessary to apply a metal layer and to remove it at corresponding points. The production of the security element thus requires fewer process steps than the method described in DE 102014016009 A1 for producing a tilted image. In addition, by the known local removal of a metal layer only a monochrome
  • Tilting image can be generated. Another advantage is thus the ability to produce brightness level or true color images.
  • the security element may be a (data) carrier for verification of authenticity, such as a security thread, a label, a transfer element or a security print.
  • the substrate may be configured as any thin-surface element suitable for supporting the plurality of microstructures.
  • the substrate may be a paper, in particular a cotton paper, or a film of polyethylene (PE), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN), polypropylene (PP) or polyamide (PA).
  • the paper may contain a proportion x of artificial polymer materials in the range of 0 ⁇ x ⁇ 100% by weight.
  • the film may be monoaxially or biaxially stretched. Among other things, the stretching of the film leads to it obtaining polarizing properties which can be used as a further authenticity feature.
  • the tools required for exploiting these properties, such as polarization filters, are known to the person skilled in the art.
  • the substrate may have a paste Pierfolienverbund or a film composite in which the substrate and the plurality of microstructures are embedded between two film layers.
  • the substrate may be transparent, translucent or opaque. Under opaque in the sense of the application is understood to mean a material which transmits a maximum of 5%, in particular a maximum of 2%, of the visible light. In the context of the application, transparent or translucent means 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 recognized through the transparent material - the image information remains after passing through the transparent material - this is not the case with a translucent material - the image information passes through the translucent material Scattering lost.
  • the laser-sensitive dye may optionally be applied as a layer to the substrate or provided in the substrate as a layer.
  • the laser-sensitive dye changes color when irradiated with the particular laser radiation.
  • the properties of the particular laser radiation can be the wavelength of the laser radiation, the
  • Intensity of the laser radiation or the polarization of the laser radiation relate.
  • the color of the substrate can thus be locally changed, resulting in color differences and thus a color effect.
  • the intensity of the particular laser radiation, the fluence or the residence time of the laser radiation at a specific location the degree of color change can be influenced so that gradations in the discoloration of the substrate can be set.
  • the parallel laser beams are preferably individually controlled, 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 may be generated by, for example, 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. More preferably, the lasers are in two or more rows arranged side by side.
  • the individual lasers of this diode laser array can be switched on or off individually or controlled individually in the intensity of the radiation to be emitted. For example, such a diode laser array has a resolution of 200 dpi to 500 dpi.
  • each diode laser generates a laser beam of the set of parallel laser beams.
  • the first angle of the irradiation direction of the set of parallel laser beams can be adjusted by the spatial arrangement of the laser sources or by deflection of 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 onto the substrate.
  • the individual microstructures can be designed as microlenses or micro-hollow mirrors.
  • the microstructures can be designed as elliptical or oval structures that are circular in cross-section perpendicular to the normal, or as line-shaped elements for focusing the laser radiation. Accordingly, the substrate has a linear color change when using linear microstructures and a lattice-shaped 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 (of a single diode laser) falls on several microstructures.
  • the single laser beam of the set has a larger extent than the microstructure. This has the advantage that the individual laser beams do not have to be exactly aligned with the respective microstructures, but rather because of the large size of the individual laser beams compared to the diameter of the microstructures
  • Laser beam always fully illuminates at least one microstructure. In this way, it can be ensured that every laser beam on the substrate causes a discoloration.
  • the number of juxtaposed laser beams in the set is preferably selected such that the structure of the tilt image can be simultaneously generated (or given) in at least one dimension, such as width or length. In the ideal case, sufficient laser beams are provided in such a way that the entire structure of the tilted image can be generated (or predetermined) by the set.
  • the tilting image can also be generated in partial images.
  • a series of juxtaposed laser beams can be used, which extends over one dimension of the tilt image (such as width or length of the tilt image) to produce the tilt image in the correspondingly different dimension (length or width) in sub-images one after the other.
  • Two rows of parallel laser beams are particularly preferably used in the set, wherein the two rows (in the sense of an overall denser beam arrangement) are arranged offset from one another by half a laser beam width.
  • the microlenses may be applied to a foil or formed integrally with a foil; the film may be applied to the substrate to form the microstructures on the substrate.
  • the microlenses may be made of a transparent material such as polyethylene (PE), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN), polypropylene (PP) or polyamide (PA).
  • PE polyethylene
  • PET polyethylene terephthalate
  • PBT polybutylene terephthalate
  • PEN polyethylene naphthalate
  • PP polypropylene
  • PA polyamide
  • the region in which the laser-sensitive dye is provided may extend over the entire substrate or may be only a partial region of the substrate.
  • the area may have an outline that matches the outline of the first tilted image. That is, the area in which the laser-sensitive dye is provided approximately coincides with the extent of the tilt images to be applied.
  • the laser beams of the set have the specific laser radiation, wherein a fluence of the determined laser radiation and / or an irradiation time per unit area are set locally differently.
  • the tilting image is preferably locally changed differently in color, so contains a color effect.
  • the fluence may be varied by varying the intensity of the individual laser beams of the set or by differentially focusing the individual laser beams of the set.
  • the irradiation time can be changed by switching on the individual laser beams of the set for a different period of time.
  • a larger or smaller proportion of the laser-radiation-sensitive dyes is activated per unit volume, whereby a different color change can be produced.
  • the present color change may be a monochrome color change, ie, for example, a change in brightness and / or color saturation.
  • the color change may include a color change, so for example a change in the color value.
  • the tilt image contains a gradual (or gradual) change in color, which is preferably a colored color.
  • the generation of the first tilted image may comprise at least two steps of irradiating laser beams.
  • the irradiation of the set of parallel laser beams is one of the two steps, but not necessarily the first of these steps.
  • the wavelength of the laser radiation may differ.
  • the at least two steps can take place from different sides of the security element.
  • the at least two steps may be 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 which 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 it is part of a continuing
  • the laser-radiation-sensitive dye is changeable in terms of its color in a modification process comprising at least two stages, wherein laser radiation is radiated in both stages and the stages differ with respect to a wavelength of the laser radiation.
  • the laser radiation for the two stages may be generated with a laser array having two different laser diodes for each laser beam so that each laser beam of the set may comprise two wavelengths.
  • the one activation of the substance is effected in the two stages and the other of the two stages effects the color change of the substance.
  • the one activation of the substance is effected in the two stages and the other of the two stages effects the color change of the substance.
  • EP 2528742 B1 described dye can be used.
  • a wavelength in the near infrared or in the infrared can be used, for example, a Nd: Y AG laser with a wavelength of 1.064 ⁇ .
  • the color change of the second stage can be generated with a laser radiation in the ultraviolet wavelength range, for example with an excimer laser.
  • a larger or smaller proportion of the laser-radiation-sensitive dye is activated.
  • the second color change step of the substance can be irradiated with over the range of homogeneous laser radiation since the degree of color change is determined by the variation of the activation.
  • the fluence and irradiation duration of the first-stage laser beams for activating the laser-radiation-sensitive dye are kept constant.
  • the variation of the color effect is produced by setting the fluence and / or the irradiation duration of the second-stage laser beams differently to produce local color differences.
  • the focal length of the microstructures for activation and color change is different, so that guiding the first and second stage laser beams through the microstructures results in a longitudinal chromatic aberration can.
  • one of the following sub-steps a to d can take place: a) a first color change of the substance, b) a second color change of the substance, c) an activation of the substance or a d) deactivation the sub substance.
  • Laser radiation-sensitive dyes may be partially changed in color in several irradiation steps (or steps). It is also known for such dyes that the dyes must first be activated by irradiation (or otherwise) before they can be changed in color by means of laser radiation.
  • the laser radiation of the particular wavelength triggers the color change.
  • the non-activated dyes are not changed in color by the laser radiation of the particular wavelength.
  • the deactivation is usually irreversible, may be final or alternatively used to specify the structure of the tilt image.
  • Technically preferred processes may comprise, for example, the partial steps in the following sequence:
  • Color change from the front side and second color change from the front or rear side with optional final deactivation from the front or rear side (a, b, d)
  • the set of laser beams can in particular cause a deactivation of the substance outside the structure of the tilted image, so that in a second Step of irradiation for color change of the substance laser radiation is radiated (front or back and, where appropriate, after activation).
  • 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 by means of mirrors to the rear side. In another embodiment, another diode laser or an array of diode lasers may 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 on the area in which the laser-radiation-sensitive dye is provided. This variant can be used in particular if a variation of the intensity is set by means of the set of laser radiation in the first stage.
  • An apparatus for producing a security element with a first tilting image comprises an arrangement region for arranging a security element, to the substrate of which a multiplicity of microstructures are applied, which radiation incident on a front side of the security element has on it focus on the substrate provided with laser-sensitive dye.
  • a first group of independently controllable laser units each generating a laser beam, and arranged side by side to form a first set of parallel laser beams in a first direction, which is directed to the front of a security element in the array area.
  • a control unit controls at least the laser units the first group for generating the first tilting image by irradiation of a security element in the arrangement area.
  • the device now also comprises
  • a second laser source which can be configured as a group of independently controllable laser units whose laser radiation is directed onto the rear side of the security element.
  • the laser-radiation-sensitive dye further comprises a third stage, which allows a further color change of the substance.
  • the third stage is activated by additional laser radiation, which is optionally irradiated through the microstructures on the front side of the substrate.
  • the additional laser radiation may, 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 be applied through the microstructures.
  • the additional 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 two laser diodes are coupled so 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 in the first stage varies / varies and the third radiation is homogeneously irradiated or that the laser beams of the first stage are homogeneous and the fluence and / or the irradiation time is varied in the laser radiation of the third stage according to the tilting image.
  • the fluence and / or the irradiation duration for the third and / or second stage be set such that Microstructure on the substrate a gradual color change is generated.
  • 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 is / are selected for the third and / or second stage in such a way that the color change in the third stage is produced depending on the Gaussian distribution on the substrate, the color changes any microstructure according to the Gaussian distribution.
  • a color-changed section thus has (not as previously described a uniform color, but) a gradual color change. This is achieved by virtue of the fact that, depending on the Gaussian distribution, the fluence and / or the irradiation duration are / is above or below a threshold value for the color change.
  • Such or similar second or third step of the irradiation of laser radiation can also be done with the aim of better visibility of the tilting image.
  • Another particularly coloring laser irradiation step may lead to an increased width of the color-changed portion by slight variation of the wavelength (eg + - 5 (or 10) nm) and / or the angle of incidence (eg + - 0.5 (, 1 or 2) degrees) ,
  • An increased width of the color-changed sections causes an enlargement of the angle range in which the tilt image is visible.
  • the intensity distribution within a laser beam can be varied to produce the above-mentioned effect. This is an option, in particular, when the intensity change in the focus caused by the focusing is low.
  • Such color changes dependent on the viewing angle are particularly desired in the case of tilt images which represent symbols, letters or characters.
  • the change in the color of the first tilted image depending on the viewing angle can represent a security feature of the security element.
  • the second tilt image can optionally be identical to the first tilt image, so that identical tilt images can be seen under two viewing angles.
  • the tilting image is visible in a first viewing angle range, then invisible and again identically visible in a second viewing angle range.
  • This can be realized, for example, by generating the set of parallel laser beams and the group of parallel laser beams from the same laser diode array and directing them onto the substrate by means of a beam splitter or mirror at different angles.
  • the second tilting image is recognizable from the front side at a second viewing angle range corresponding to the second angle.
  • a third tilt image or further tilt images can be generated.
  • a second (third or further) tilt image is generated with a second (third or further) laser diode array.
  • the second (or any other) tilt image may be different than the first tilt image.
  • the second, third or each further tilt image can be generated in a similar way as the first tilt image.
  • the considerations made regarding the first tilted image, the preferred development and the advantages can be applied analogously.
  • the second tilt image can be adjusted such that, with increasing viewing angle, first the first tilted image under a first color, then under a second color, then the second tilted image under the first color and then the second tilting image is recognizable under the second color.
  • the second tilt image may also be generated with a diode laser array that is different from the diode laser array for generating the set of parallel laser beams.
  • the first tilt image and the second tilt image can 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 no or only a small heat generation, the first tilt image and the second tilt image can be generated simultaneously, without resulting in thermal damage to the substrate. This would be in the demetallization for generating the tilt image, as shown in the
  • the security against forgery of the security element can be further increased by combining a regular image with a tilt image into a forest.
  • the microstructures cover only a part of the area with the laser-radiation-modified substance, the set of parallel laser beams being irradiated onto the entire area with the substance which can be modified by the laser radiation.
  • the regular image is recognizable from the front side next to the first tilted 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 changes into a regular image could possibly be adjusted by other means.
  • an imprint by means of a shutter effect (for example, by applying a foil with directed lamellas) could become a partially tilting image with adjacent regular partial image. Preference is therefore present in the regular
  • a second (third or further) tilting image is particularly preferably generated in the present case by means of the microstructures. Under a single microstructure are thus sections of different tilt images. For the viewer, the tipping pictures are (at least overlapping) in the same place. Creating a second tilt image for the viewer at the same location is not possible with the technologies available to a counterfeiter by means of blinds effects.
  • the microstructures may, for example, be applied to a carrier foil or formed in a carrier foil, wherein the carrier foil is arranged on the part of the region with the laser-radiation-modifiable substance.
  • the carrier film may be strip-shaped.
  • the laser-radiation-sensitive dye is distributed over a volume of the substrate.
  • the laser-radiation-sensitive dye can be mixed in the preparation of the substrate with their starting materials. If z.
  • the laser-radiation-sensitive dye can be added to the fabric for running in the trough of the paper machine.
  • the substrate may, as already described, comprise a plurality of partial regions which comprise the laser-radiation-modifiable substance.
  • the microstructures are present in the first subregion and a regular image can be generated in a second subregion without microstructures.
  • the subregions of the substrate may comprise different or the same substrate material.
  • the substrate may comprise a plastic film in the first partial region and a paper substrate in the second partial region.
  • the laser radiation modifying bare substance contained in the substrate material or be provided as a coating. The same laser-radiation-modifiable substance can be introduced into the subregions at different times.
  • the first subregion is 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.
  • FIG. 2 shows a plan view of a further embodiment of a value document
  • Fig. 3 is a sectional view taken along the line I-I of Fig. La;
  • Fig. 6 is a sectional view for illustrating a manufacturing method for the document of value.
  • FIGS. 1 and 2 portions of various embodiments of a value document 10 are shown.
  • the value document 10 can be, for example, a banknote and comprises a security element 12.
  • a regular image 16 can be seen in a plan view on a substrate 14 of the security element 12.
  • the regular image 16 is shown in FIGS. 1 and 2 as a triangle or detail of a quadrilateral, but may 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 wide viewing angle range, for example from 0 ° to 70 ° or 80 ° with respect to a normal, in top view of the document of value 10, as shown in FIGS. 1b and 1c.
  • a first tilt image 18 can be seen in addition to the regular image 16.
  • the first viewing angle range is clearly smaller than the viewing angle range of the regular image 16.
  • the first viewing angle range may be ⁇ 3 °, ⁇ 7 °, ⁇ 15 ° or ⁇ 30 ° of the first angle ⁇ .
  • the first tilting image 18 is shown in FIG. 1b as a quadrilateral, which complements the regular image 16 to form an overall image, the regular image 16 and the first tilting image 18 being in perfect registration with one another.
  • a second tilt image 20 can be seen, which as well as the first tilt image 18 in perfect registration to the re - gular picture 16 stands.
  • the second viewing angle range may be ⁇ 3 °, ⁇ 7 °, ⁇ 15 ° or ⁇ 30 ° of the second angle ⁇ .
  • the first tilting image 18 and / or the second tilting image 20 can / may have any desired shape in addition to the illustrated quadrilaterals and in particular represent persons, objects or animals.
  • the overall picture is a coat of arms and the tilting pictures 18, 20 represent parts of the coat of arms that can be seen from the respective viewing angle.
  • the first tilting image 18 and / or the second tilting image 20 can, as shown in FIG. 2, be composed of non-contiguous sections which optionally complement each other with the regular image 16 to form an overall image.
  • the sections of the tilting image can be formed, for example, in the respective visible parts of a pendulum thread in the value document.
  • the structure, the method of production and the mode of operation of the value document 10 or of the security element 12 will be explained with reference to the sectional views in FIGS. 3-6.
  • the value document can also be regarded as a security element in a broader sense.
  • the embodiment of the security element 12 shown in FIG. 3 has, in addition to the substrate 14, a color layer 22 with laser-radiation-sensitive dyes contained therein, an optional carrier layer 24 and a large number of microstructures 26.
  • the substrate 14 is made in the embodiment shown from paper, in particular cotton paper. In addition, the substrate 14 may also be made of a film.
  • the color layer 22 is a part of the substrate 14 in which the laser-radiation-sensitive dye is distributed. However, it is also possible that the color layer 22 is a separately applied to the substrate 14 layer.
  • the laser-sensitive dye is a dye which changes color depending on the fluence of the incident radiation and the duration of the irradiation.
  • the carrier layer 24 is applied, on which the microstructures 26 are formed.
  • the carrier layer 24 consists of a transparent film, for example polyethylene (PE) or polypropylene (PP).
  • the microstructures 26 are formed as, optionally circular, microlenses and in the embodiment shown made in one piece with the carrier layer 24. However, it is also possible for the plurality 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 region of the substrate 14 in which the laser-radiation-sensitive dye is provided. Among other things, the sections of the tilting image 18 shown in Figure 2 can be realized by different configurations.
  • the microstructure 26 is present only in the subsections, per subsection, in the sense of FIG. 3, a film element 24 with microstructures 26 is applied to the substrate 14.
  • the microstructures 26 are embedded in the substrate 14 on the carrier layer 24.
  • the microstructures optionally as in FIG. 2 as a pendulum thread, can be embedded in the substrate.
  • the partial region 24, 26 would be an element integrated in the substrate 14, wherein the color layer 22 of the partial region without microstructures could possibly be arranged in the same plane with the microstructures.
  • a substrate can thus comprise subregions of different substrate material, which are optional at different times with laser radiation active dyes, possibly in a color layer, can be provided.
  • the production of the value document 10 or of the security element 12 is in one embodiment as follows: First, in the region of the regular image 16 and the later first tilt image 18, the laser-radiation-sensitive dye is introduced into the substrate 14, for example by impregnating the substrate 14 with a liquid, like glue that contains the laser-sensitive dye. In this way, the color layer 22 is provided with an extension which corresponds to the later regular image 16 and the first tilt image 18. In the area of the first tilting image 18 and the second tilting image 20, the carrier layer 24 with the plurality of microstructures 26 arranged thereon is applied. Subsequently, a set 28 of laser beams is irradiated at a first angle ⁇ to a normal to the substrate 14.
  • the individual laser beams of the set 28 have an extension that 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 tilt image 18 result therefrom in that in the ink layer 22 at the locations where the set of laser beams 28 the color layer 22 hits, a color change occurs.
  • the individual laser beams of the set 28 have an equal intensity and an equal exposure duration, so that the regular image 16 and the first tilt image 18 appear as homogeneous surfaces.
  • the laser beams of the set 28 are spaced from each other, there is no continuous color change in the color layer 22.
  • the ink layer 22 having a width b. In between there are non-colored sections 32 in the color layer 22, in which no color change was caused. If one now considers the security element 12 from the front side at a viewing angle which is approximately equal to the first angle ⁇ , then the eye of the observer receives radiation which originates from the colored sections 30. The first tilting image 18 is thus recognizable. If the security element 12 is viewed from the front side from a viewing angle which differs from the first angle ⁇ , then the radiation reaching the eye of the observer originates from the non-colored sections 32, so that the first tilted image 18 is not recognizable. Only the color of the uncoloured substrate 14 is visible or the base color of the laser-sensitive layer, which may well have an intrinsic 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 tilting image 20 take place analogously to the first tilting image 18, except that a group 34 of laser beams is irradiated at a different, second angle ⁇ to produce the second tilting image 20, as shown in FIG. 5.
  • a group 34 of laser beams is irradiated at a different, second angle ⁇ to produce the second tilting image 20, as shown in FIG. 5.
  • the irradiation of the group 34 of laser beams may be simultaneous with that of the set 28 of laser beams or sequentially.
  • FIG. 4 Another embodiment of the value document 10 or security element 12 is shown in FIG. 4. This is true except for the following
  • the microstructures 26 are designed as micro-hollow mirrors which focus incident laser beams onto the ink layer 22.
  • the ink layer 22 is in the embodiment shown in FIG provided separately from the substrate 14 and may be formed, for example, as a film in which laser-sensitive dye is mixed.
  • the mode of action and method of production is analogous to the value document 10 shown in FIG. 3.
  • the laser-sensitive dye of the color layer 22 and / or the laser radiation are adapted such that the laser-sensitive dye does not react to the unfocussed radiation, ie is transparent to it. Only the radiation focused by the microstructures produces the color change.
  • FIG. 5 shows an enlarged view of another embodiment of the document of value 10.
  • the embodiment according to FIG. 5 is identical to the embodiment according to FIG. 3 except for the following difference:
  • the laser-sensitive dye is completely in the substrate in the embodiment according to FIG 14 distributed so that no separate color layer 22 is formed.
  • the colored portion 30 extends further into the substrate 14.
  • FIG. 6 shows a further embodiment of the value document 10 or security element 12, which corresponds to the embodiment shown in FIGS. 3 and 5.
  • a laser-sensitive dye is used, which can be changed in terms of its color in a modification process comprising at least two stages.
  • the set 28 of laser beams at the first angle ⁇ is irradiated through the microstructures 26.
  • the wavelength of the laser radiation is, for example, in the infrared, in particular 1.064 ⁇ .
  • the laser radiation for the first stage is used to activate the laser radiation-sensitive dye.
  • color change is irradiated laser radiation with one of the set 28 of laser radiation of different wavelength, 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 in the illustrated embodiment over the area of the regular image 16 and the first tilt image 18.
  • the set 28 of laser beams for the first stage is modified accordingly.
  • the substrate and / or the wavelength of the back irradiated laser radiation are chosen so that the substrate for the laser radiation is sufficiently transparent.
  • a third stage (or a third step of irradiating laser radiation) for producing a further color effect in the laser-radiation-sensitive dye according to the embodiment of FIG. 6.
  • laser radiation having a wavelength similar to the wavelength for the first stage is used. Therefore, the laser radiation for the third stage can be re-irradiated through the microstructures 26, in particular again at the first angle a.
  • the fluence and the duration of irradiation of the laser-sensitive dye for the (second or) third stage are selected such that the color change within (each) of the colored portion 30 is different.
  • This can be caused, for example, by the fact that, due to the focusing through the microstructures 26, a Gaussian intensity distribution in the ink layer 22 or in the substrate 14 results. Due to this, a gradual color change results in the inked portion 30, and in the middle of the inked portion 30, the color of the color change of the (second or) third stage and at the edges of the inked portion 30 does not result in color change by this stage.
  • FIG. 6 only the color of the second stage of the color change is correspondingly present at the edges of the respectively colored sections 30.
  • the first tilt image 18 with the color for the second stage becomes recognizable.
  • the color gradually changes from the color of the second stage to the color of the third stage.

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Credit Cards Or The Like (AREA)
  • Semiconductor Integrated Circuits (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)

Abstract

L'invention concerne un procédé de fabrication d'un élément de sécurité (12) comprenant un kinégramme. Le procédé comporte les étapes suivantes consistant à : fournir un substrat (14) qui présente une zone pourvue d'un colorant sensible à un rayonnement laser ; former une pluralité de microstructures (26) sur le substrat (14), les microstructures (26) étant conçues chacune de manière à focaliser dans cette zone un rayonnement incident sur une face avant du substrat (14) ; et projeter un groupe (28) de faisceaux laser parallèles sur les microstructures (26) selon un premier angle par rapport au substrat (14), les différents faisceaux laser du groupe (28) étant agencés de manière à produire une structure d'un premier kinégramme (18), lequel peut être décelé depuis la face avant selon un angle d'observation associé au premier angle (et). Le colorant sensible au faisceau laser change de couleur une fois irradié par un rayonnement laser défini, et le premier kinégramme (18) présente un effet de couleur provoqué par la modification de la couleur.
PCT/EP2017/001226 2016-10-21 2017-10-19 Élément de sécurité et procédé de fabrication d'un élément de sécurité WO2018072881A2 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201780044412.7A CN109562635B (zh) 2016-10-21 2017-10-19 防伪元件和用于制造防伪元件的方法及设备
EP17791574.1A EP3529084B1 (fr) 2016-10-21 2017-10-19 Procédé de fabrication d'un élément de sécurité

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
DE102016012625.6 2016-10-21

Publications (2)

Publication Number Publication Date
WO2018072881A2 true WO2018072881A2 (fr) 2018-04-26
WO2018072881A3 WO2018072881A3 (fr) 2018-06-14

Family

ID=60191324

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2017/001226 WO2018072881A2 (fr) 2016-10-21 2017-10-19 Élément de sécurité et procédé de fabrication d'un élément de sécurité

Country Status (4)

Country Link
EP (1) EP3529084B1 (fr)
CN (1) CN109562635B (fr)
DE (1) DE102016012625A1 (fr)
WO (1) WO2018072881A2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021078406A1 (fr) 2019-10-24 2021-04-29 Giesecke+Devrient Currency Technology Gmbh Élément de sécurité ayant un code ir lisible par machine
WO2021078407A1 (fr) 2019-10-24 2021-04-29 Giesecke+Devrient Currency Technology Gmbh Élément de sécurité et document de valeur doté de signes de sécurité contrôlables visuellement et par machine qui sont en relation spatiale les uns avec les autres
US12128703B2 (en) 2019-10-24 2024-10-29 Giesecke+Devrient Currency Technology Gmbh Security element having machine-readable IR code

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
DE102021002214A1 (de) * 2021-04-27 2022-10-27 Giesecke+Devrient Mobile Security Gmbh Sicherheitsmerkmal für ein Wertdokument, Wertdokument und Verfahren zur Herstellung eines Sicherheitsmerkmals

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2528742B1 (fr) 2010-01-25 2015-10-07 Datalase Limited Appareil d'impression sans encre
DE102014016009A1 (de) 2014-10-28 2016-04-28 Giesecke & Devrient Gmbh Verfahren zum Herstellen eines Sicherheitselements mit einem Linsenrasterbild

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5932319B2 (ja) * 1974-03-22 1984-08-08 富士写真フイルム株式会社 記録材料
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 (de) * 1985-10-15 1987-12-17 GAO Gesellschaft für Automation und Organisation mbH, 8000 München Ausweiskarte mit einem optischen Echtheitsmerkmal
KR102012526B1 (ko) * 2011-01-28 2019-08-20 크레인 앤 코, 인크 레이저 마킹된 소자

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2528742B1 (fr) 2010-01-25 2015-10-07 Datalase Limited Appareil d'impression sans encre
DE102014016009A1 (de) 2014-10-28 2016-04-28 Giesecke & Devrient Gmbh Verfahren zum Herstellen eines Sicherheitselements mit einem Linsenrasterbild

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021078406A1 (fr) 2019-10-24 2021-04-29 Giesecke+Devrient Currency Technology Gmbh Élément de sécurité ayant un code ir lisible par machine
WO2021078407A1 (fr) 2019-10-24 2021-04-29 Giesecke+Devrient Currency Technology Gmbh Élément de sécurité et document de valeur doté de signes de sécurité contrôlables visuellement et par machine qui sont en relation spatiale les uns avec les autres
US12128703B2 (en) 2019-10-24 2024-10-29 Giesecke+Devrient Currency Technology Gmbh Security element having machine-readable IR code

Also Published As

Publication number Publication date
DE102016012625A1 (de) 2018-04-26
EP3529084B1 (fr) 2021-01-06
CN109562635B (zh) 2021-07-20
CN109562635A (zh) 2019-04-02
WO2018072881A3 (fr) 2018-06-14
EP3529084A2 (fr) 2019-08-28

Similar Documents

Publication Publication Date Title
EP3529084A2 (fr) Élément de sécurité et procédé de fabrication d'un élément de sécurité
DE69607977T2 (de) Sicherheitsdokument mit sicherheitsmarkierung
EP2018277B1 (fr) Élément de sécurité comprenant un marquage au laser
EP2646256B1 (fr) Support de données à marquage
WO2017097430A1 (fr) Élément de sécurité muni d'une image lenticulaire
DE102005025095A1 (de) Datenträger und Verfahren zu seiner Herstellung
EP2465701B1 (fr) Elément de sécurité doté de marques
EP0628431A1 (fr) Support d'enregistrement fait de plusieurs couches et procédé d'écriture sur un support d'enregistrement
DE102007036622A1 (de) Sicherheitsmerkmal und Verfahren zu seiner Herstellung
EP2539154B1 (fr) Procédé de marquage coloré de documents de valeur et de sécurité
EP2941355B1 (fr) Procédé de réalisation d'un élément de sécurité comprenant une couche d'enregistrement sensible au rayonnement laser
EP2753754B1 (fr) Procédé de fabrication d'un papier de sécurité et fil à microlentilles
EP3554846B1 (fr) Procédé permettant de fabriquer un élément de sécurité doté d'une image lenticulaire
EP3243669B1 (fr) Procédé de fabrication d'un élément de sécurité
DE102018005697A1 (de) Sicherheitselement mit Linsenrasterbild
DE102018005705A1 (de) Sicherheitselement mit Linsenrasterbild
EP3279003B1 (fr) Élément de sécurité et procédé de fabrication d'un élément de sécurité
DE102015005672A1 (de) Sicherheitsmerkmal und Verfahren zu dessen Herstellung
EP3254864B1 (fr) Caractéristique et son procédé de fabrication
EP3254865A1 (fr) Caractéristique et son procédé de fabrication
EP3286010B1 (fr) Procédé servant à fabriquer un élément de sécurité avec un alignement entre un élément d'impression et un filigrane
EP3072703A2 (fr) Procede de fabrication d'une fenetre dans un substrat de papier comprenant un element de securite

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 17791574

Country of ref document: EP

Kind code of ref document: A2

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 2017791574

Country of ref document: EP

Effective date: 20190521