EP3820715A1 - Élément de sécurité optiquement variable à zone de surface réfléchissante - Google Patents

Élément de sécurité optiquement variable à zone de surface réfléchissante

Info

Publication number
EP3820715A1
EP3820715A1 EP19742129.0A EP19742129A EP3820715A1 EP 3820715 A1 EP3820715 A1 EP 3820715A1 EP 19742129 A EP19742129 A EP 19742129A EP 3820715 A1 EP3820715 A1 EP 3820715A1
Authority
EP
European Patent Office
Prior art keywords
color coating
security element
color
element according
relief
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.)
Granted
Application number
EP19742129.0A
Other languages
German (de)
English (en)
Other versions
EP3820715B1 (fr
Inventor
Kai Herrmann SCHERER
Maik Rudolf Johann SCHERER
Raphael DEHMEL
Michael Rahm
Giselher Dorff
Andreas Rauch
Christian Fuhse
Tobias Sattler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Giesecke and Devrient Currency Technology GmbH
Original Assignee
Giesecke and Devrient Currency Technology GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Giesecke and Devrient Currency Technology GmbH filed Critical Giesecke and Devrient Currency Technology GmbH
Publication of EP3820715A1 publication Critical patent/EP3820715A1/fr
Application granted granted Critical
Publication of EP3820715B1 publication Critical patent/EP3820715B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • B42D25/351—Translucent or partly translucent parts, e.g. windows

Definitions

  • the invention relates to an optically variable security element with a reflective surface area.
  • the invention also enters a method for producing such a security element and a data carrier equipped with such a security element.
  • Data carriers such as documents of value or identity documents, but also other objects of value, such as branded articles, are often provided with security elements for security purposes, which allow the authenticity of the data carriers to be checked and which at the same time serve as protection against unauthorized reproduction.
  • the security elements can be designed, for example, in the form of a security thread embedded in a bank note, a cover film for a bank note with a hole, an applied security strip, a self-supporting transfer element or also in the form of a feature area printed directly on a value document.
  • Security elements with a viewing angle-dependent or three-dimensional appearance play a special role in ensuring authenticity, since they cannot be reproduced even with the most modern copying machines.
  • the security elements are equipped with optically variable elements that convey a different image impression to the viewer from different viewing angles and, for example, depending on the viewing angle, show a different color or brightness impression and / or a different graphic motif.
  • optically variable effects for example movement effects, pump effects, depth effects or flip effects, which are realized with the aid of holograms, microlenses or micromirrors. Proceeding from this, the invention has for its object to further increase the security against falsification and the visual attractiveness of generic optically variable security elements and, in particular, to provide optically variable security elements with two or more different appearance or effects in different colors with good detectability.
  • the present optically variable security element has a multicolored reflective surface area, the surface area of which defines a z direction perpendicular to it.
  • the multicolored reflective area contains an upper and a lower relief structure, which are arranged in the z direction at different heights.
  • the upper and lower relief structures are provided with a respective upper and different lower color coating. The two relief structures overlap in an overlap area.
  • the upper color coating has a recess in the overlap area, so that
  • An exposed portion of the lower color coating is arranged in the z direction under the recess.
  • the lower color coating with parts of the hidden section and the exposed section occurs in it Color impression in appearance.
  • the colored reflective surface is enlarged in the present case.
  • the proportion of the concealed section which appears is more than 2.5%, preferably more than 5%, of the area which appears.
  • the relief structures are preferably embossed structures. Embossing in a hardenable layer, such as only UV varnishes, is particularly preferred. Alternative production methods, such as subtractive lasering or additive construction, for example using 3D printing, are conceivable but less cost-effective.
  • the first or second relief structure of the multicolor reflective surface area together with its color coating, forms a first or second monochrome reflective relief structure.
  • the color coatings appear colored, reflective. At the viewing angle, the light is reflected from the relief structure to the viewer and thus appears in the present sense.
  • the color coating determines the color impression.
  • As the incoming light also has a preferred direction - in particular essentially vertically - it is known that the viewer experiences a clearly perceptible colored light reflex.
  • the relief structure determines the optically variable effect.
  • the upper color coating preferably has a plurality of cutouts.
  • the dimensions of the recess in the overlap area are more than 140 pm, in particular more than 250 pm or even more than 500 pm.
  • the portion of the concealed section which appears can form between 2.5% and 12%, preferably between 4% and 10%, of the area which appears.
  • the upper color coating is designed as a regular or irregular grid with grid elements and grid spaces as the recesses, the dimensions of the grid elements and / or the grid spaces being at least in one direction below 140 ⁇ m.
  • the apparent portion of the hidden section is between 10% and 90%, preferably between 15% and 40% (or between 60% and 85%) of the surface area which appears.
  • other color coatings in particular with a third and / or a fourth color impression, can be used.
  • different two-color features can be present, in particular with a third (together with the first or second) color impression or with a third and fourth color impression.
  • one of the (first, second, third or fourth) color coatings outside of the present feature or outside the overlap area can have a different colored hue.
  • the relief structures are micromirror arrangements which comprise a large number of directional micromirrors.
  • the micromirror arrangement (s) is (are) achromatic micromirror arrangement (s), which in particular is (are) non-diffr active.
  • the respective color coating only appears color-reflective depending on the viewing angle.
  • the directional mirrors of the micromirror arrangement are distinguished by a preferred direction of reflection, which can be set, for example, by means of an inclination angle and / or azimuth angle. Arrangements of small, radiation-optically acting reflective facets that direct incident light like small mirrors in a direction of reflection given by the condition "angle of incidence equals angle of reflection", who referred to as the micromirror arrangements.
  • the individual directional micromirrors of the micromirror arrangement either reflect the light to the viewer or not (light or dark), depending on their orientation for the viewing angle. Only through the color coating does the micromirror appear in a color reflective manner or not (colored light or dark). Since the micromirror arrangements represent embossed structures, they are also sometimes referred to as micromirror embossments in this description. Particularly well plane micromirrors are suitable as directional micromirrors. Alternatively, directional concave mirrors and / or directional fresnel-like (ie multi-part) mirrors can be used.
  • the micromirrors are advantageously formed with an edge length between 4 ⁇ m and 100 ⁇ m, preferably between 5 pm and 30 pm.
  • the micromirrors preferably have a (maximum) pitch of less than 20 pm, in particular less than 10 pm, further preferably less than 5 pm.
  • the micromirrors are preferably arranged in one or both in micromirror arrangements in a periodic grid with a period length between 4 pm and 100 pm, preferably between 5 pm and 30 pm.
  • the directional micromirrors can be regular or irregular (for example the same shape or varying shape) and / or arranged (for example in a pattern or distributed quasi-randomly).
  • the multicolored reflective surface area - in particular at least one of the two relief structures, the difference in height levels and / or at least one of the color coatings - is adapted in order to increase the proportion of the covered section of the lower color coating visible to the viewer in the viewing angle .
  • the height difference with which they are arranged can be selected so that the effective proportion of hidden sections is optimized.
  • the color coatings can be selected such that they are coordinated with one another, that is to say, for example, the upper color coating has increased transmission for the color / the color range of the lower color coating.
  • At least one relief element is shifted in the relief plane, shifted in the z-direction, adjusted in size or adapted in shape.
  • both relief structures are generated simultaneously and in a matched manner, it makes sense to adjust the position of individual relief elements in the upper or lower relief structure in favor of the reflected intensity.
  • the extent of the adjustments is primarily limited only by the given optical effect of the relief structure (movement, three-dimensionality, ).
  • the multicolored reflective surface area is - in particular a reflectivity of the upper relief structure or at least one of the Color coatings - adjusted to provide more reflective light for the hidden section.
  • the reflective area contains exactly two relief structures, which are each arranged at a certain height.
  • the two relief structures of the reflective surface area are each advantageously characterized by a maximum pitch, the spacing of adjacent height steps in the z direction being greater than the maximum pitch of the respectively embossed structure area.
  • the distance is preferably greater than 150%, particularly preferably 200%, of the maximum gear height.
  • the distance between adjacent height steps in the z direction is more preferably between 150% and 750%, particularly preferably between 200% and 500%, further preferably between 200% and 400% of the maximum pitch of the lower embossed structure area.
  • the pitch of the micromirrors depends on their lateral dimensions and their angles of inclination. Even with the same lateral dimensions, the inclination angles of the micromirrors are typically different, so that the micromirrors have different pitch. Characteristic of the micromirror arrangement, however, is the maximum pitch of its micromirrors. The above maximum gear heights ("pitch less than") are preferred. If, for example, the micromirrors have an edge length of 10 pm and a maximum inclination angle of 30 °, the maximum pitch of the micromirror arrangement is complete
  • the individual micro mirrors may have a pitch of between 0 and G m ax depending on the inclination angle.
  • the distance between the micro mirror assembly and the overlying micromirror assembly is then in some cases greater than 5.8 pm and is in particular between 8.7 pm (150% of Gmax) and 23.2 pm (400% of Gmax).
  • the micromirrors have a uniform size, in particular edge length.
  • the micromirrors of the micromirror arrangement have a maximum pitch but different edge lengths. If a smaller edge length is selected for micromirrors with a higher angle, a smaller maximum pitch can be maintained.
  • Micromirrors with an inclination angle at a critical angle with a uniform size (or edge length) and micromirrors with an inclination angle above the critical angle with a reduced size (or edge length) are preferably provided.
  • Gmax 5.8 pm in a micromirror arrangement
  • micromirrors can be present in this way up to a maximum inclination of approximately 49 degrees if their edge length is only 5 pm instead of 10 pm.
  • a maximum pitch of the embossed structure areas can also be determined analogously for other embossed relief structures.
  • the color coatings of the relief structures are formed in advantageous designs by glazing colors.
  • Metallizations for example Ways of aluminum, silver or an alloy, such as copper and aluminum, are also possible, as are thin-film structures, in particular color-shifting thin-layer structures, color-stable, color-filtering thin-layer structures (different colors in reflectance and transmission) or silicon-aluminum thin layers.
  • the color coatings can also be formed by glazing paints with a deposited metallic mirroring, for example made of aluminum.
  • the color coatings can be a glazing image of several glazing colors, which is backed with a mirror, for example made of aluminum.
  • Luminescent colors in particular fluorescent colors with a metallic mirroring, are also suitable as color coatings.
  • the color coatings can also be formed by structural colors.
  • nanoparticle paints can also be used as color coatings, such as gold-blue particles, various effect pigments, color-changing pigments or super silver.
  • a color coating preferably follows the relief profile of a relief structure.
  • One surface (or both surfaces) of the color coating follow the relief structure.
  • the second surface of the color coating (s) preferably also follows the relief structure.
  • the second surface can be flat.
  • the second surface of the color coating comprises a colored coloring structure, such as a sub-wavelength, nano or binary structure.
  • the color coatings are preferably brought up directly on the relief structures, in particular the micromirror arrangements. Different types of color coatings can also be present side by side or one above the other.
  • the second surface of a reflective partial layer of the color coating (s) preferably also follows the relief structure.
  • the second surface of a glazed color sublayer of the color coating (s) can likewise follow the relief structure, be flat or follow the other relief structure.
  • the remaining part of the layers can also be combined with other layers.
  • the embossing lacquer for the adjacent, higher relief structure area can be colored and thus represent a continuous partial color coating for the lower relief structure area.
  • the lower surface of the (first) colored embossing lacquer preferably follows the lower relief structure and the upper surface of the colored embossing lacquer forms the upper (first) relief structure.
  • the color impressions of the first and second color coatings are different, they differ in their color. Both color coatings preferably produce a colored hue. Alternatively, one of the two color coatings for the viewer can produce an achromatic color tone, preferably silvery, and the other can produce a chromatic color tone.
  • the color coating of the lower relief structure can also only be present in some areas. Color coatings present in some areas can either be applied in areas and / or selectively removed after application over the entire surface.
  • Structured paint coatings with metallic paints, thin-layer paints, structural paints or nanoparticles can be produced, for example, by using a washing paint.
  • wash ink is printed for the respective embossed structure in the insetter print, then metallized over the entire surface and then washed.
  • the relief structure can be further adjusted.
  • the relief structure can in some areas include a fine structure that reduces adhesion (and / or increases adhesion), which in particular has a hydro-phobic (or hydrophilic) effect. The adhesion-reducing fine structure in one area thus prevents in particular the washing paint from adhering to the area.
  • a first area with a fine structure that reduces adhesion can optionally adjoin a second area with a fine structure that increases adhesion.
  • the use of an optionally colored etching resist is particularly advantageous in combination with glazing colors.
  • the embossed structure can first be completely coated, then the etching resist is printed, with the desired areas remaining unprinted, and finally the coating is etched.
  • Laser exposure can be used to remove metallic colors, metallic reflections, as well as laser-sensitive, glazing colors with high resolution.
  • a light-absorbing fine structure, such as moth eye structures or quasi-random structures, can be provided in regions in the relief structure.
  • etching resist an optionally colored photoresist can first be applied over the entire surface and then exposed in regions. Depending on the resist used, the exposed or unexposed areas then dissolve in the etching bath, so that the metal underneath dissolves, while the metallic areas covered by the photoresist remain protected from the etching.
  • Color coatings can also be created by a metal transfer process. Areas that are to be demetallized are embossed using an embossing tool. The foil that has been pretreated in this way is then completely metallized and the metal on the embossed areas is selectively removed with another foil so that only metal remains in the recesses. A color transfer can also be generated in a similar manner. Areas that should later appear in color are embossed compared to the remaining areas. A colorant, such as flakes, nanoparticle paint, super silver or a glazing paint, is applied to a roller and selectively transferred to the highly embossed areas of the film.
  • a desired color coating is produced by deeply embossing areas that are later to appear colored in relation to the remaining areas.
  • a colorant for example flakes, nanoparticle ink, super silver or a glazing ink, is printed over the entire surface and then peeled off with a hard-set doctor blade or wiped off with a cloth, so that ink only remains in the depressions.
  • the security element described can additionally be equipped with colorless or color negative signs.
  • the overlap area additionally contains partial areas with a negative marking, in which the color coating of the higher embossed structure area and at least partially also the color coating of the lower embossed structure area is omitted.
  • the color coating of the lower-lying relief structure can be completely left out in the negative marking subregions, so that the negative marking does not produce any of the color impressions of the two color coatings.
  • the negative indicator appears particularly colorless and is particularly easy to see in transmitted light.
  • the color coating of the lower-lying relief structure is formed in several layers, with at least one of the several layers being left out in the negative marking partial areas, so that a colored negative marking is produced.
  • the color coating of the lower-lying relief structure advantageously contains an opaque partial layer, in particular a metallization, and a translucent color layer, the opaque partial layer, but not the translucent color layer, being left out in the negative marking partial areas, so that a negative mark with the color effect of the translucent color layer is created.
  • the line widths of the superimposed recesses of a negative label are advantageously above 100 pm, preferably above 150 mhi, particularly preferably above 300 pm, in order to ensure that the negative labels are easily recognizable. If the indicator is negative, the recesses in the color coating of the lower relief structure are advantageously formed with a somewhat larger area than the recesses in the color coating of the higher relief structure in order to compensate for register fluctuations between the two relief structures.
  • the relief structures are arranged on opposite sides of a transparent carrier film.
  • relief structures are arranged one above the other on the same side of a carrier film.
  • the relief structures can be arranged directly one above the other, or can be separated from one another by an adhesive layer, for example a laminating adhesive layer or a laminating film.
  • the kier foil can also form the flat support of the security element. After the security element has been applied to a target data carrier, the carrier of the target data carrier can also represent the flat carrier of the security element.
  • the invention further includes a data carrier with a security element of the type described.
  • the data carrier can in particular be a document of value, such as a bank note, in particular a paper bank note, a polymer bank note or a composite film bank note, a share, a bond, a A certificate, a voucher, a check, a high-quality admission ticket, but also an identification card such as a credit card, a bank card, a cash payment card, an authorization card, a personal ID card or a passport personalization page.
  • the invention also includes a method for producing a security element of the type described above, in which a carrier is provided, the surface extension of which defines an xy plane and a z axis perpendicular to it, the carrier will be provided with a multicolored reflective surface region which is formed with at least two embossed structure regions, which are related in the z direction at different height levels the flat carrier are arranged, the embossed structure areas are each provided with a color coating, which produce a different color impression of the two embossed structure areas when viewed from + z direction, the two embossed structure areas are overlapping, and the color coating of the higher embossed structure area in the overlap area is formed with recesses, the dimensions of which are more than 100 pm and in which the color coating of the lower embossed structure area is visible, so that in the overlap area the higher embossed structure area is marked with an initial th color impression and the deeper embossed structure area appear with a second, different color impression matched to each other.
  • the resulting color impression is determined by the color coating, so that the present relief structures could also be referred to as achromatic relief structures Filter, diffract and / or reflect wavelength-selectively and create your own color impression.
  • the carrier can be a part of the security element.
  • the security element is removed from the carrier, for example when the security element is transferred from the carrier to a target substrate.
  • FIG. 1 shows a schematic representation of a banknote with a security element according to the invention
  • FIG. 2 schematically shows a section of the security element of FIG. 1 in cross section
  • Fig. 3 is a plan view of a section of the security element of the
  • FIGS. 4 shows a modification of the embodiment of FIGS. 2 and 3, in which the color coating of the higher-lying micromirror arrangement has alternating strip-shaped cutouts and strips of the same size which have been left standing,
  • Fig. 7 shows a security element according to the invention with an additional Lich area with a colored negative marking.
  • Figure 1 shows a schematic representation of a banknote te 10 with an optically variable security element 12 according to the invention in the form of a glued-on transfer element.
  • the invention is not limited to transfer elements and banknotes, but can be used for all types of security elements, for example for labels on goods and packaging or for securing documents, ID cards, passports, credit cards, health cards and the like .
  • transfer elements such as patches with or without their own carrier layer
  • security threads or security strips are also considered.
  • the security element 12 shown in Fig. 1 is itself very flat, but still gives the viewer the three-dimensional impression of an apparently bulging out of the plane of the banknote 10 motive 14 that appears with a first color, for example blue.
  • the motif 14 can represent, for example, a value number, a portrait or another graphic motif.
  • a movement effect in a second color is visible in a partial area 16, for example a red partial area 16, in which a light bar appears to move up and down along the partial area when the banknote 10 is tilted, and a so-called rolling Bar effect created.
  • the areas of different colors (red or blue) and different effects (three-dimensional motif or moving bars) are exactly matched to each other. This registration is therefore also referred to below as color-to-effect registration.
  • FIG. 2 showing a section of the security element 12 schematically in cross section and FIG. 3 for illustration of the visual appearance, a view of a section of the Security elements 12 shows.
  • the security element 12 contains a flat carrier 18, the surface area of which defines an x-y plane and a z axis perpendicular to it.
  • a multi-colored reflective surface area 20 is arranged, which contains two embossed structure areas 24, 34, which are arranged in the z direction at two specific, different height levels with respect to the flat carrier 20.
  • the embossed structure regions each represent micromirror embossments or micromirror arrangements 24, 34, which are each formed from a multiplicity of micromirrors inclined against the xy plane.
  • the local angles of inclination of the micromirrors are chosen such that the relief structure of the micromirror arrangements 24, 34 produce a desired visual appearance after the color coating, for example the bulging three-dimensional impression of the motif 14 or the rolling bar effect of the partial area 16.
  • the micromirror arrangements 24, 34 are each provided with a color coating 26, 36 which, when viewed from above, creates the different color impression of the micromirror arrangements for the viewer 40.
  • the micromirror arrangement 24 is coated with a red, imaginative color 26, while the micromirror arrangement 34 is coated with a blue, glazing color 36. Sections 26o of the color coating 26 are thus open in the z direction under the recess 42. In the z direction under the upper color coating 36 there is a hidden section 26v of the lower color coating 26.
  • the lower color coating 26 with portions of the hidden section 26v and the exposed section 26o appear in their color impression at a viewing angle.
  • the effective area can thus be increased.
  • the alignment of the micromirrors belonging to the portions of the open and concealed sections 26o and 26v should be coordinated with one another. In the example shown, the alignment is identical, for example.
  • the micromirror arrangements 24, 34 are each embossed in a transparent embossing lacquer layer 22, 32 and, after the application and optionally structuring of the respective color coating 26, 36, are leveled with a transparent top lacquer layer 28 or 38.
  • the topcoat layers have essentially the same refractive index as the embossing lacquer layers 22, 32, so that the micromirrors do not appear visually in areas without color coating due to the lack of refractive index difference between the embossing lacquer layer and the topcoat layer.
  • the security element 12 is designed for viewing from above - in particular from a viewing direction different from the z direction - so that the micromirror arrangement 24 further away from the viewer 40 than the lower-lying micromirror arrangement and the micromirror arrangement 34 closer to the viewer 40 than the higher-lying micro mirror arrangement is called.
  • the two micromirror arrangements 24, 34 are arranged one above the other in the entire surface area 20 of the security element 12.
  • the color coating 36 of the micromirror arrangement 34 located higher up has a large cutout 42, for example in the form of a 5 mm wide and 2 cm long curved strip.
  • the micromirrors of the micromirror arrangement 34 unfold due to the lack of refractive index difference between the lacquer layers 32, 38 no optical effect, so that the observer 40 looks through these lacquer layers onto the lower-lying micro mirror arrangement 24 with its red color coating 26 , Outside the recess 42, however, the visual impression of the surface area 20 is determined by the higher-lying micromirror arrangement 34 with its blue color coating 36.
  • the viewer therefore perceives the blue motif 14 generated by the micromirror arrangement 34 outside the cutout 42, while the red rolling bar effect appears in the cutout 42 in the partial area 16 , in which, when the banknote 10 is tilted, a light bar 16-A seems to run back and forth in the direction of the arrow 16-B.
  • the height difference of the two micromirror arrangements 24, 34 is in the range of a few micrometers or a few tens of micrometers and is therefore not perceptible to the viewer 40.
  • the two different colors Motifs and the different effects 14, 16 therefore seem to be arranged side by side for the viewer 40 in an exact register.
  • FIG. 4 shows a modification of the embodiment of FIGS. 2 and 3, in which the color coating 36 of the higher-lying micromirror arrangement 34 alternately has strip-shaped cutouts 42 and equally large, strip-shaped areas left standing.
  • the local inclination angles of the micromirrors of the micromirror arrangements 24, 34 are selected such that the micromirror arrangements each produce a rolling bar effect with the opposite direction of travel.
  • the security element is tilted, the viewer sees a blue rolling bar effect in the partial areas 14 in which the blue color coating 36 has been left, and a red rolling bar effect in the recesses in the partial areas 16 with an exact register.
  • the blue bars 14-A and the red bars 16-A each move in the opposite direction for the viewer, as illustrated in FIG. 4.
  • FIG. 5 Some advantageous film structures of security elements according to the invention are shown in FIG. 5.
  • the security element 50 of FIG. 5 (a) there is a transparent embossing lacquer layer 22, 32 with the desired micromirror embossing 24, 34, the color coating 26, 36 and the transparent topcoat layer 28 on the two opposite sides of a transparent PET carrier film 18, 38 arranged.
  • the security element 50 is designed for viewing from the side of the color coating 36, so that the color coating 36 of the higher-lying micromirror arrangement 34 is provided with large cutouts 42 in which the viewer looks at the lower-lying micromirror arrangement 24 with the color coating 26.
  • the security element 52 of FIG. 5 (b) has the layer structure already described in FIG. 2.
  • Both micromirror embossments 24, 34 are arranged on the same side of the carrier film 18, which does not have to be transparent in this embodiment.
  • the first embossing lacquer layer 22 with the first, deep-lying micromirror embossment 24, the first color coating 26, the first transparent cover layer 28, the second, transparent embossing lacquer layer 32 with the second, higher lying micromirror embossing 34, the second color coating are on the carrier film in this order 36 and the second transparent cover layer 38 are arranged.
  • the security element 52 is designed for viewing from the side of the color coating 36, so that the color coating 36 of the higher-lying micromirror arrangement 34 is provided with large-area cutouts 42 in which the viewer looks at the lower-lying micromirror arrangement 24 with the color coating 26.
  • a transparent film can also be arranged above the further layers 22, 26, 28 and 32, 36, 38.
  • the transparent film can be the carrier film 18 of the security element, can be a further carrier film or can serve as a protective film.
  • the order of the further layers 22, 26, 28 and 32, 36, 38 can be unchanged.
  • the first embossing lacquer layer 22 can lie above the first covering layer 28 and / or the second embossing lacquer layer 32 can lie above the second covering layer 38.
  • the further layers follow in the order 32, 36, 38, 22, 26, 28, for example.
  • the color coating 26 and the top layer 28 and / or the color coating 36 and the top layer 38 can by a color coating 26 or 36 with - in particular flat - upper surface to be formed.
  • the color coating 26 and / or 36 comprises a reflective partial layer (such as metallization), which follows its relief structure with both surfaces, and a partial layer with glazing color, the lower surface of which follows the relief structure, while the upper surface of the transparent partial color layer follows the relief Structure does not follow, is preferably flat.
  • an upper, colored, imaginative partial layer of the lower color coating 26 in FIG. 5b forms the lower cover layer 28 and at the same time the upper embossing lacquer layer 32.
  • the color coating 26 preferably in turn comprises a reflective partial layer (such as metallization), which with both Surfaces follow their relief structure.
  • a glaze-colored partial layer preferably an embossing lacquer layer, follows the color coating 26 with its lower surface of the lower relief structure 24 and with its upper surface of the upper relief structure 34.
  • the lower color coating comprises at least (or exactly) three partial layers, one reflective partial layer, a compensating partial layer and a partial layer with a translucent color, preferably colored embossing lacquer. With one (or both) surface (s), the reflecting partial layer follows the second, lower relief structure 24 and the colored-glazing partial layer follows with its upper side the first, upper relief structure 34.
  • two films 18-A, 18-B can also be used in the production of the security element, each of which is provided separately with one of the micromirror structures 22-28 or 32-38 and then suitably laminated together.
  • the two carrier films 18-A, 18-B are laminated together in such a way that the micromirror structures 22-28 or 32-38 inside.
  • the liner 56 can comprise a lamination film or can be formed only by a lamination adhesive.
  • one or both of the carrier foils 18-A, 18-B can be removed after the laminate in order to form the security element 54 as thin as possible.
  • both carrier films 18-A, 18-B can even be removed, since the stability of the security element 54 is ensured by the lamination film, which then acts as a flat carrier of the security element.
  • the wasele element 54 is designed for viewing from the side of the color coating 36, so that the color coating 36 of the higher-lying micromirror arrangement 34 is provided with large recesses 42, in which the viewer of the lower-lying micromirror arrangement 24 with the color coating 26th looks.
  • the carrier foils 18-A, 18-B are laminated together in such a way that one micromirror structure 22-28 is on the inside and the other micromirror structure 32-38 is on the outside.
  • the liner 56 can comprise a lamination film or be formed only by a lamination adhesive.
  • the outer carrier film 18-A can be removed after lamination in order to make the security element 58 as thin as possible.
  • the large-area recesses 42 are also provided in the color coating 36 of the higher-lying micromirror arrangement 34 in order to enable the viewer to see the lower-lying micromirror arrangement 24 with the color coating 26.
  • the color coatings 26, 36 can be formed not only by glazing colors, but also, for example, by metallizations, by thin-film structures, by glazing colors deposited with a metallization, by luminescent colors with metallic mirroring, by structural colors or by nanoparticle colors ,
  • the carrier film 18 is an optional element. It can therefore be omitted in any of the variants shown, mentioned or following.
  • the carrier film 18 in FIG. 5 (b), the carrier film (s) 18-A / B in FIG. 5 (c) or the carrier film 18-A in FIG. 5d before (or after) application of the security element can be removed on a target substrate.
  • a release layer, not shown, which lies between the carrier film and the other layers, will be seen in such configurations.
  • the security elements according to the invention can additionally also contain areas with negative identifications, for example a negative writing, as illustrated with reference to FIGS. 6 and 7.
  • areas with negative identifications for example a negative writing, as illustrated with reference to FIGS. 6 and 7.
  • FIGS. 6 and 7 For simplification, only the micromirror structures 22-28 and 32-38 without carrier foils or further layers of the layer structure are shown in these figures.
  • the security element 60 of FIG. 6 is basically constructed like the security element 12 of FIG. 2, in particular the color coating 36 of the higher-lying micromirror arrangement 34 contains cutouts 42 in partial areas 16, which are arranged above coated areas 26 of the lower-lying micromirror arrangement 24 and produce the color-to-effect registration described above.
  • the security element 60 also contains partial areas 62 in which the color coatings 26, 36 of both microns mirror mirror arrangements 24, 34 are recessed (recesses 44 and 42), so that the security element 60 does not show any of the color impressions of the two color coatings in these areas.
  • the shape of the partial areas 62 forms a negative indicator, in particular a negative writing, which can be recognized particularly well in transmitted light in the case of an at least translucent configuration of the further layers of the security element.
  • the cutouts 44 of the color coating 26 of the lower-lying micromirror arrangement 24 are formed with a somewhat larger area than the associated cutouts 42 in the color coating 36 in order to absorb register fluctuations between the two embossed structures 24, 34.
  • the line widths of the recesses 42, 44 lying one above the other are greater than 100 pm, in particular greater than 300 mih, in order to ensure that the negative indicators can be easily recognized.
  • Colored negative identifiers can also be provided, as illustrated by the security element 70 in FIG. 7.
  • the color coating 26 of the lower-lying micromirror arrangement 24 consists of a glazing paint 74 deposited with a metallization 72.
  • the cutouts 42 of the color coating 36 lie, as in FIG. 6, over completely coated regions 26 of the lower-lying micromirror arrangement 24, so that the color-to-effect registration already described results in these partial areas.
  • the security element 70 contains partial areas 76 in which, in addition to the color coating 36 of the higher micromirror arrangement 34, the metallization 72 of the color coating 26 of the lower micromirror arrangement 24 is left out, but the glazing color 74 is retained is. While the security element 70 appears colored and opaque in the partial areas 16 due to the metallization 72, the partial areas 76 are colored and translucent due to the lack of metallization 72 there. The shape of the partial areas 76 thus forms a colored negative identification, in particular a colored negative writing, which can be recognized particularly well in transmitted light when the further layers of the security element are at least translucent. 7, the cutouts in the metallization 72 are advantageously formed with a somewhat larger area than the cutouts 42 in the color coating 36 in order to absorb register fluctuations. The line strengths of the recesses lying one above the other are preferably greater than 100 pm, in particular greater than 300 pm, in order to ensure that the colored negative markings can be easily recognized.

Landscapes

  • Credit Cards Or The Like (AREA)

Abstract

L'invention concerne un élément de sécurité optiquement variable comportant une zone de surface réfléchissante multicolore et dont l'extension de surface définit une direction z qui lui est perpendiculaire, la zone de surface réfléchissante multicolore contenant une structure en relief supérieure et une structure en relief inférieure (34, 24) qui sont disposées dans la direction z à des niveaux de hauteur différents, les deux structures en relief sont munies chacune d'un revêtement coloré supérieur et d'un revêtement coloré inférieur (36, 26) différent, lesdits revêtements colorés chevauchant les deux structures en relief dans une zone de chevauchement, le revêtement coloré supérieur présente un évidement (42) dans la zone de chevauchement, de sorte qu'une partie cachée (26v) du revêtement coloré inférieur (26) est disposée dans la direction z sous le revêtement coloré supérieur (36) et qu'une partie dégagée (26o) du revêtement coloré inférieur (26) est disposée dans la direction z sous l'évidement (42), et dans un angle d'observation, le revêtement coloré inférieur (26) apparaît avec des parties de la partie recouverte (26v) et de la partie dégagée (26o) dans son effet de couleur.
EP19742129.0A 2018-07-09 2019-07-09 Element de securite optiquement variable avec zone de surface reflectif Active EP3820715B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018005454.4A DE102018005454A1 (de) 2018-07-09 2018-07-09 Optisch variables Sicherheitselement mit reflektivem Flächenbereich
PCT/EP2019/000212 WO2020011392A1 (fr) 2018-07-09 2019-07-09 Élément de sécurité optiquement variable à zone de surface réfléchissante

Publications (2)

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EP3820715A1 true EP3820715A1 (fr) 2021-05-19
EP3820715B1 EP3820715B1 (fr) 2023-07-19

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EP19742129.0A Active EP3820715B1 (fr) 2018-07-09 2019-07-09 Element de securite optiquement variable avec zone de surface reflectif

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EP (1) EP3820715B1 (fr)
DE (1) DE102018005454A1 (fr)
WO (1) WO2020011392A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019004325A1 (de) 2019-06-18 2020-12-24 Giesecke+Devrient Currency Technology Gmbh Sicherheitssubstrat und daraus hergestelltes Wertdokument
DE102020000732A1 (de) * 2020-02-04 2021-08-05 Giesecke+Devrient Currency Technology Gmbh Optisch variables Sicherheitselement
DE102020007013A1 (de) 2020-11-16 2022-05-19 Giesecke+Devrient Currency Technology Gmbh Optisch variables Sicherheitselement mit reflektivem/transmissivem Merkmalsbereich
DE102021001582A1 (de) 2021-03-25 2022-09-29 Giesecke+Devrient Currency Technology Gmbh Optisch variables Sicherheitselement, Herstellungsverfahren und Prägeanordnung
DE102021001588A1 (de) 2021-03-25 2022-09-29 Giesecke+Devrient Currency Technology Gmbh Herstellungsverfahren für ein optisch variables Sicherheitselement
DE102021001589A1 (de) * 2021-03-25 2022-09-29 Giesecke+Devrient Currency Technology Gmbh Herstellungsverfahren für ein optisch variables Sicherheitselement
DE102021002599A1 (de) 2021-05-18 2022-11-24 Giesecke+Devrient Currency Technology Gmbh Optisch variables Darstellungselement

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Publication number Priority date Publication date Assignee Title
ATE431260T1 (de) * 1995-11-28 2009-05-15 Ovd Kinegram Ag Optischer informationsträger
DE102007039996B4 (de) * 2007-02-07 2020-09-24 Leonhard Kurz Stiftung & Co. Kg Sicherheitselement für ein Sicherheitsdokument und Verfahren zu seiner Herstellung
DE102007034716A1 (de) * 2007-07-23 2009-01-29 Giesecke & Devrient Gmbh Sicherheitselement
DE102007061827A1 (de) * 2007-12-20 2009-06-25 Giesecke & Devrient Gmbh Sicherheitselement und Verfahren zu seiner Herstellung
DE102009031387A1 (de) * 2009-07-01 2011-01-05 Giesecke & Devrient Gmbh Sicherheitselement und Herstellungsverfahren dafür

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DE102018005454A1 (de) 2020-01-09
EP3820715B1 (fr) 2023-07-19

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