EP3980274A1 - Verfahren zum herstellen eines optisch variablen sicherheitselements - Google Patents
Verfahren zum herstellen eines optisch variablen sicherheitselementsInfo
- Publication number
- EP3980274A1 EP3980274A1 EP20731792.6A EP20731792A EP3980274A1 EP 3980274 A1 EP3980274 A1 EP 3980274A1 EP 20731792 A EP20731792 A EP 20731792A EP 3980274 A1 EP3980274 A1 EP 3980274A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- color
- embossing lacquer
- lacquer layer
- coating
- relief structure
- 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.)
- Pending
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
- B42D25/40—Manufacture
- B42D25/405—Marking
- B42D25/43—Marking by removal of material
-
- 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
- B42D25/328—Diffraction gratings; Holograms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/30—Identification or security features, e.g. for preventing forgery
- B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
- B42D25/373—Metallic 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
- B42D25/40—Manufacture
- B42D25/405—Marking
- B42D25/425—Marking by deformation, e.g. embossing
-
- 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
- B42D25/43—Marking by removal of material
- B42D25/445—Marking by removal of material using chemical means, e.g. etching
Definitions
- the invention relates to a method for producing an optically variable security element.
- the security elements can, 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 one
- Transfer elements or in the form of a feature area printed directly on a document of value are transferred elements or in the form of a feature area printed directly on a document of value.
- Security elements with a viewing angle-dependent or three-dimensional appearance play a special role in securing authenticity, since these cannot be reproduced even with the most modern copiers.
- the security elements are equipped with optically variable elements that give the viewer a different image impression from different viewing angles and, for example, show a different color or brightness impression and / or a different graphic motif depending on the viewing angle.
- movement effects, pump effects, depth effects or flip effects are described as optically variable effects, which are implemented with the aid of holograms, microlenses or micromirrors.
- the document EP 1 879 154 A2 discloses a method for producing a security element for a security paper or document of value with a substrate which is equipped with a coating comprising two layers. The method comprises the steps of applying a first layer to the substrate, applying at least a second layer to the first layer, the first layer not being fully cured before applying the second layer, embossing at least one layer of the coating and curing the coating .
- the publication WO 2014/060089 A2 relates to an optically variable surface pattern with a carrier which has a first and a second surface area, the two surface areas being designed such that the first surface area has a first view that appears to be curved in a first solid angle area and the second surface area in a second solid angle area, which is different from the first solid angle area, presents a second view that appears curved.
- An optically variable surface pattern is known from the publication WO 2014/121908 A1 which has two partial areas with reflection elements, the reflection elements of the first partial area on the one hand and the reflection elements of the second partial area reflecting incident spruce in different reflection directions on the other.
- the first sub-area is covered with a first translucent color layer in such a way that, when the viewing angle at which the viewer is viewing the optically variable surface pattern is changed, the first sub-area in a first color when reaching a first viewing angle and when it is reached at a second viewing angle sees the second partial area glow in a second color different from the first color. Proceeding from this, the invention is based on the object of specifying a simple and cost-effective method for producing counterfeit-proof and visually attractive optically variable security elements.
- security elements with two or more different appearances or effects in different colors should be able to be produced in just a few work steps.
- the security elements should ideally be able to be produced with a small layer thickness in order to facilitate the introduction or application in security and valuable documents.
- a support is provided, the area of which defines a z-axis perpendicular to it,
- a first embossing lacquer layer is applied to the carrier in a surface area, PI) a first relief structure is embossed in the first embossing lacquer layer,
- a second relief structure that differs from the first relief structure is embossed into the second embossing lacquer layer, so that the first relief structure and the second relief structure are arranged in the z-direction at different heights relative to the carrier, and
- a first color impression is created by combining the color effects of at least the first embossing lacquer layer and the color coating
- a second, different color impression is created by combining the color effects of at least the first embossing lacquer layer, the second embossing lacquer layer and the color coating .
- the first and / or second embossing lacquer layer are applied in step A1) or A2), preferably by means of screen printing, offset printing, flexographic printing or gravure printing.
- the embossing lacquer of the first and / or second embossing lacquer layer can in particular be a UV lacquer, a thermoplastic lacquer, or a so-called dual your system, that is, a combination of a UV lacquer and a thermoplastic lacquer .
- the second embossing lacquer layer is advantageously applied in step A2) in register with the first relief structure. After the embossing steps PI) or P2), the first or second embossing lacquer layer is cured in advantageous configurations, ie in particular when a UV lacquer or a dual your system is used.
- step M the coating is applied directly to the two embossing lacquer layers.
- the phrase “apply on” does not otherwise exclude the existence of intermediate layers between the applied layer and the target object.
- other layers may already have been applied to the carrier, for example a translucent color coating.
- the first embossing lacquer layer is then applied to the carrier provided with this colored coating.
- the colored coating can be applied both to the side of the first embossing lacquer layer and to the opposite side of the carrier.
- step M the coating is applied simultaneously to the first and (the free portion of the) second relief structure.
- the applied coating is preferably a full-area coating.
- the (preferably full-area) coating is provided with cutouts after step M).
- the (preferably full-area) coating is provided with cutouts after step M).
- a washing color is printed onto the first and / or second embossing lacquer layer and the washing color is washed out together with the coating after step M), or it is washed out - After step M), a resist is applied to the color coating, and the coating is removed by an etching step in the areas not provided with resist.
- an optionally colored photoresist can first be applied over the entire surface and then exposed in certain areas.
- the exposed or unexposed areas dissolve in the etching bath, so that the underlying coating dissolves while the coated areas covered by the photo remain protected from the etching.
- the recesses in the coating are preferably designed in the form of drawings, patterns or coding. They advantageously represent negative markings, for example negative writing, which is particularly evident when viewing the security element through transmitted light.
- the recesses or negative markings can in principle be placed at all points on the security element. Depending on the placement and product structure, the recesses or negative markings can produce different color impressions.
- transparent negative markings are possible, in other words negative markings that are neither covered by a translucent color nor by a metallization.
- colored negative markings can also be generated in which the negative markings are covered by at least one translucent color.
- the coating applied in step M) is also referred to here as a color coating (unless it is clearly transparent).
- the coating applied in step M) is preferably by means of a metallization (colored or achromatic) or a thin layer containing a metal layer layer structure formed
- the metallization can represent, for example, a layer made of aluminum, silver or an alloy, for example made of copper and aluminum.
- color-shifting thin-film structures in particular with absorber-dielectric-absorber or reflector-dielectric-absorber as a layer sequence, for example with silicon and aluminum or chrome sublayers, come into question as thin-film structures.
- the color coating can also be formed by a translucent color with an underlying metallic mirror coating, for example made of aluminum.
- a luminescent paint in particular a fluorescent paint with a metallic mirror coating, can also be used as the paint coating.
- the color coating can also be formed by a nanoparticle color, such as gold-blue particles, various effect pigments, color-changing pigments or super silver.
- color a distinction is usually made between chromatic colors and achromatic colors, with chromatic colors being characterized not only by their lightness, but also by their hue and saturation.
- Achromatic colors are white, black and gray, and the silvery metallic colors, for example the color of a reflective aluminum or silver layer, are regarded as achromatic colors in the context of this application.
- a colored or colored layer is a layer with the color effect of a colored color (for example a red lasing layer) o- that of an achromatic color (for example a silvery, shiny aluminum layer).
- a colorless layer has no color, but its colorlessness still defines a color effect.
- the term "color impression” is finally used for the overall color impression produced by one or more layers.
- the layers in the non-covered but coated part
- create a first color impression which is created by the combination of the color effect of at least the first embossing lacquer layer and the color effect of the color coating.
- a covered portion creates a second, different color impression through the color effects of at least the first embossing lacquer layer, the second embossing lacquer layer and the color coating.
- red glazing layer red color effect
- achromatic color effect a shiny red color impression
- blue glazing layer blue color effect
- transparent, colorless layer colorless Color effect
- achromatic color effect a shiny blue color impression
- a covered portion can be a surface area or can be present in a surface area as grid elements.
- several covered portions can preferably be present in a security element.
- the first embossing lacquer layer is colorless, while the second embossing lacquer layer is colored with a translucent colored color or achromatic color.
- the second embossing lacquer layer is colored with a translucent colored color or achromatic color.
- other shapes are also advantageous in which one or both layers of embossing lacquer are colored with a translucent color, a luminescent color or a nanoparticle color. The only condition is that the color effects of the first and second embossing lacquer layers differ from one another.
- a further color coating in particular a translucent color coating, is applied to the side of the carrier opposite the embossing lacquer layers, or between the carrier and the first embossing lacquer layer. This enables a large number of color combinations to be generated when viewing the security element.
- a first color impression is produced in the non-covered, coated part through the combination of the color effects of the further color coating, the first embossing lacquer layer and the above-mentioned coating, and in the covered part (overlap area) through the combination of the color effects of the further color coating, the first embossing lacquer layer, the second embossing lacquer layer and the above-mentioned coating a second color impression.
- the first and / or second relief structure are formed by micromirror arrangements with directed micromirrors, in particular with plane mirrors, concave mirrors and / or Fresnel-like mirrors.
- the lateral dimensions of the micromirrors are advantageously below 20 mm, preferably below 10 mm.
- the first and the second color impression can be perceived separately from one another by the viewer, in particular perceptible as a function of the viewing angle and / or separately from one another in areas.
- the micromirrors of the first and / or the second relief structure are preferably one directed in order to generate only one of the two color impressions for the viewer in an effect area, depending on the viewing angle.
- the micromirrors of the first and / or the second relief structure are alternatively or additionally set up to generate the two color impressions in two (adjacent or separate) surface areas.
- each of the micromirrors is aligned with a predetermined spatial alignment (azimuth angle and angle of inclination).
- the alignment is adapted to a subject and to a viewing angle dependency of the subject.
- a viewing angle dependency can bring about a movement effect, a three-dimensional impression or a change in the motif for a motif in the (respective) surface area.
- a transparent carrier is advantageously provided as the carrier, or the carrier is detachably connected to the first embossing lacquer layer in order to enable the security element to be viewed from the side of the first embossing lacquer layer.
- viewing can take place through the carrier; a non-transparent carrier must be removed for viewing from the side of the first embossing lacquer layer, for example after the security element has been transferred to a target substrate.
- the transparent carrier is advantageously colorlessly transparent, but it can also be colored with a glaze in order to produce an additional color effect.
- the second embossing lacquer layer is applied at least in a partial area in the form of a regular or irregular grid with grid elements and grid spaces, the dimensions of the grid elements and / or grid spaces at least in one direction between 20 ⁇ m and 200 ⁇ m , in front- preferably between 60 mm and 150 mm, in particular between 80 mm and 120 mm.
- the grid elements and grid spaces of the grid have the same shape and preferably also the same size.
- the grid elements and / or the grid spaces can in particular be formed by strip-shaped, square, triangular or other polygonal elements, but can also have irregular shapes.
- the grid itself can be regular, i.e. have a regular arrangement of grid elements and grid spaces, but can also be an irregular grid, for example a stochastic grid, in which the grid elements and / or grid spaces have irregular spacings and / or sizes and / or shapes exhibit.
- the area coverage of the grid by the grid elements is advantageously between 30% and 70%, preferably between 40% and 60%, in particular around 50%.
- an effect area is formed in which an uncovered portion forms (at least) a first surface area with the first relief structure and a covered portion forms (at least) a second surface area with the second relief structure.
- the dimensions of the surface areas are advantageously above the resolution limit of the naked eye, so that each surface area can be recognized without aids.
- an effect area is formed in which the second embossing lacquer layer is applied in partial areas which have lateral dimensions of more than 140 ⁇ m, and / or in which the two te embossing lacquer layer is applied with recesses that have lateral dimensions of more than 140 gm.
- the lateral dimensions of at least a partial area and / or at least one cutout are preferably more than 250 ⁇ m, preferably more than 500 ⁇ m and in particular more than 1 mm.
- the partial areas or recesses of the effect area therefore typically extend over many micromirrors or relief elements.
- the specified dimensions can only be exceeded by the subregions or cutouts in one lateral direction, but the cutouts are advantageously larger than the stated dimensions in each lateral direction.
- the dimensions are particularly advantageously above the resolution limit of the naked eye, so that the surface area of the partial areas or recesses can be recognized without aids.
- the two relief structures advantageously provide a color change for an unchanged motif as a function of the viewing angle or provide a color change together with a motif change.
- the motifs of the two relief structures can vary in particular with regard to shape (for example head, apple or figure), movement (static to moved or moved to static, with linear, rotating and / or pumping movement) and / or dimensionality (2D to 3D, or differently three-dimensional with positively or negatively curved appearance or floating in front of or behind a plane) of the motif.
- the first relief structure generates a first motif which is visible from a first viewing angle area with a first color impression, which is created by the combination of the color effects of at least the first embossing lacquer layer and the Color coating is created and the second relief structure creates a second motif that is visible from a second viewing angle range with a second, different color impression, which is created by the combination of the color effects of at least the first embossing lacquer layer, the second embossing lacquer layer and the color coating, wherein the first and second viewing angle ranges do not overlap.
- the security element When tilted, the security element then shows a binary change in color and effect without any overlapping area.
- the two viewing angle ranges advantageously border one another or are only separated by an angular distance of a few degrees, so that the associated image impressions are practically seamlessly skipped for the viewer.
- the first relief structure generates a first movement motif with a first color impression and the second relief structure generates a second movement motif with a second, different color impression, the first and second movement motifs when tilting of the security element offset to one another or move against one another and thereby cross in a position of difference in which both motifs of movement are visible, and / or move one after the other through the same part of the common area.
- the first color impression arises from the combination of the color effects of at least the first embossing lacquer layer and the color coating
- the second color impression arises from the combination of the color effects of at least the first embossing lacquer layer, the second embossing lacquer layer and the color coating.
- the proposed method allows the production of security elements of the type mentioned at the beginning with only a few work steps.
- the described layer structure also allows security elements with a With a total thickness of less than 45 mm, which are ideal for use in banknotes and other value documents.
- FIG. 1 shows a schematic representation of a bank note with two security elements according to the invention
- FIG. 2 schematically shows a detail of the first security element of FIG. 1 in cross section
- FIG. 5 schematically shows a detail of the second security element of FIG. 1 in cross section
- FIG. 1 shows a schematic representation to a banknote te 10 having two optically variable security elements 12 and 62, j in each case in the form of an affixed transfer element are formed.
- the invention is not limited to transfer elements and bank notes, but can be used with all types of security elements, for example with labels on goods and packaging or with the protection of documents, ID cards, passports , Credit cards, health cards and the like.
- security threads or security strips can also be considered.
- the two security elements 12, 62 of FIG. 1 are themselves very flat, but nevertheless give the viewer a three-dimensional impression.
- the first security element 12 shows a binary change in color and effect when the banknote 10 is tilted, in which, from a first viewing direction, a first motif 14-A that appears to bulge out of the plane of the banknote 10, for example a curved representation the value number "10" appears with a first, for example silvery, shiny color impression. From a second viewing direction, there is a second motif 14-B that appears to bulge out of the plane of the bank note 10, for example a curved representation of a coat of arms with a second color impression, for example a shiny red color impression.
- FIG. 2 schematically showing a section of the security element 12 applied to the bank note 10 in cross section and FIG. 3 showing various intermediate steps the production of the security element 12 shows.
- the security element 12 contains a flat, transparent, colorless carrier 18, the area of which defines an xy plane and a z-axis perpendicular to it.
- a multicolored reflective surface area is arranged on the carrier 18 and contains an embossed structure area 25 with two nested micromirror embossments 24, 34 at two different height levels.
- a first embossed area 24 is provided by micromirror embossings, the base areas of which lie at a height Hi above the carrier 18.
- a second embossed area 34 is provided by micromirror embossings, the base areas of which are at a height H2> Hi above the carrier 18. The height as well as the direction of the positive z-axis are always measured starting from the carrier 18. Since the security element 12 is viewed from the bottom, that is to say the side of the carrier 18 is designed, the z-axis in the illustration of FIG. 2 extends away from the carrier downwards.
- micromirror embossings 24, 34 each contain a multiplicity of micromirrors inclined relative to the xy plane, the local inclination angles of which are selected so that the relief structures of the micromirror embossings 24, 34 interact with the color effects of the Embossing lacquer layers 22, 32 and the color effect of a uniform color coating 26 produce a desired visual appearance.
- the angles of inclination of the micromirrors in the exemplary embodiment are selected so that the micromirror arrangement 24 generates the curved representation of the value number "10" in a viewing angle range of + 5 ° to + 20 ° (viewing position 40-A) based on the surface normal the micromirror arrangement 34 generates the curved representation of the coat of arms in a viewing angle range of -5 ° to -20 ° (viewing position 40-B).
- the micromirrors of the micromirror embossing 24, 34 themselves have a lateral dimension of 10 ⁇ 10 mm 2 and a maximum height h of 3.5 mm in the exemplary embodiment.
- the micromirror arrangements 24, 34 are produced by embossing two different embossing lacquer layers 22, 32 with different color effects. While the embossing lacquer layer 22 in which the micromirror arrangement 24 is embossed is transparent, colorless, the embossing lacquer layer 32 in which the micromirror arrangement 34 is embossed is colored in a translucent red. Both micromirror arrangements 32, 34 are provided with a uniform color coating 26, which is Leading example is formed by a metal coating, specifically by a thin, vapor-deposited aluminum layer, which has a silvery metallic, and thus achromatic color effect.
- the desired visual contrast of the micromirror arrangements 24, 34 from the viewing positions 40-A or 40-B of the viewer 40 is created by the interaction of the different color effects of the embossing lacquer layers 22, 32 with the color effect of the uniform color coating 26.
- the two micromirror arrangements 24, 34 are nested within one another in the form of a regular grid 50 in the entire surface area of the security element 12, with only the micromirror embossings 24 of the height level Hi being present in the first grid areas 52, while in the complementary second grid areas 54 , the overlap area, the second embossing lacquer layer 32 with the micromirror embossings 34 are also present at the height level H2 and are optically effective.
- the grid areas 52, 54 in the exemplary embodiment form a checkerboard pattern in which each field, that is to say each grid area 52, 54 has a dimension of 100 mm ⁇ 100 ⁇ m.
- the grid 50 since the micromirrors are generally significantly smaller, here, for example, have an edge length of only 10 ⁇ m, the grid 50, unlike in the simplified schematic representation of FIGS. 2 and 3, generally does not coincide with the grid of the micromirrors the micromirror assemblies 24, 34 together.
- the described arrangement results in the desired appearances. Since the carrier 18 and the first embossing lacquer layer 22 are transparent, colorless, the micromirror arrangement 24 with the silvery metallic appearance of the aluminum layer 26 is visible from the viewing position 40-A, which the curved representation 14-A the value number "10" shows. Due to the red glazing coloring of the second embossing lacquer layer 32 and the backing of the second embossing lacquer layer with the aluminum layer 26, the coat of arms 14-B appears with a shiny red appearance from viewing position 40-B.
- a transparent carrier 18, for example a transparent colorless PET film is provided and provided with a first, transparent and colorless embossing lacquer layer 22.
- the micromirror embossing 24, which generates the representation 14-A of the numerical value “10”, is embossed into the first embossing lacquer layer 22 with an embossing tool (not shown).
- an embossing tool not shown.
- the embossing lacquer layer 22 is then hardened.
- a second, translucent red colored embossing lacquer layer 32 is then printed onto the first embossing lacquer layer 22 in a regular grid 50, as shown in FIG. 3 (b).
- the grid 50 is designed in the form of grid elements 54 and grid spaces 52 and corresponds, for example, to the chessboard pattern described above with field dimensions of 100 ⁇ m ⁇ 100 ⁇ m.
- the grid elements 54 generate the covered portion or the Coverage area in which the second embossing lacquer layer 32 is applied to the first embossing lacquer layer 22.
- the second embossing lacquer layer 32 is then applied with an embossing tool (not shown) with the micro-mirror embossing 34, which shows the coat of arms Representation 14-B generated as shown in Fig. 3 (c).
- embossing lacquer layer 32 is then hardened.
- a major advantage of the manufacturing method according to the invention is the very small number of work steps required compared with conventional methods.
- the proposed layer structure also results in very small product thicknesses of less than 45 ⁇ m, which is particularly important for the use of the security elements in bank notes and other documents of value.
- the security elements can also be provided in a simple manner with transparent or colored negative identifiers using the method described, as explained in more detail elsewhere.
- FIG. 4 shows some concrete advantageous configurations of the grid 50 of the second embossing lacquer layer 32 in plan view.
- the grid elements 54 are each shown hatched and grid spaces 52 are shown without hatching.
- FIG. 4 (a) shows a grid 50 as used in FIGS. 2 and 3, in which the grid elements 54 and grid spaces 52 form a chessboard pattern.
- the dimensions of the grid areas are advantageously between 20 ⁇ 20 mm 2 and 140 ⁇ 140 mm 2 , in particular between 20 ⁇ 20 mm 2 and 60 x 60 mm 2 , the area coverage is 50%. If an area coverage deviating from 50% is to be generated, some of the grid elements 54 can be omitted or some of the grid spaces 52 can be covered with grid elements.
- the area coverage of the grid with grid elements 54 is preferably between 30% and 70%, in particular between 40% and 60%. Due to the surface coverage of the first and second grid areas, the brightness of the appearances produced in each case can be adjusted as desired.
- FIG. 4 (b) shows a grid 50 with alternately arranged strip-shaped grid elements 54 and grid spaces 52.
- the width of the grid areas is advantageously between 20 mm and 140 mm, in particular between 20 mm and 60 mm.
- the length of the grid areas is arbitrary and can be several millimeters or even a few centimeters. The area coverage can easily be adjusted via the relative width of the grid elements and grid spaces.
- the grid elements and grid spaces can also have other polygonal shapes or irregular shapes.
- FIG. 4 (c) shows an embodiment in which the grid elements 54 and grid spaces 52 of the grid 50 are formed by triangles.
- the grid elements 54 and grid spaces 52 are formed by irregular shapes.
- the grid elements and / or grid spaces can form a coherent structure, as shown for example in FIG. 4 (d) for the grid spaces 52.
- the second security element 62 transferred to the bank note 10 itself is also very flat, but nevertheless gives the viewer the three-dimensional impression of a motif 64 which appears to bulge out of the plane of the bank note 10 and which has a first color impression appears.
- the motif 64 can represent, for example, a value number, a portrait or another graphic motif.
- a movement effect with a second color impression is visible in a partial area 66.
- a light bar can move up and down along the sub-area 66 and produce a so-called rolling bar effect.
- the areas of different color impression (first and second color impression) and different effects (three-dimensional motif or running bar) are precisely matched to one another. This registration is therefore also referred to below as color-to-effect registration.
- the security element 62 contains negative writing 68 in the form of the numerical value “10”, which is formed by a transparent partial area of the security element 62. If the security element 62 is arranged over an opaque area of the bank note 10, the surface of the bank note, for example the white bank note paper, becomes visible there. If the security element 62 is arranged over a window area of the bank note, the negative writing 68 forms a transparent see-through area in the security element 62, which lights up brightly when viewed through transmitted light.
- FIG. 5 schematically showing a section of the security element 62 on the bank note 10.
- introduced security element 62 in cross section and
- FIG. 6 shows various intermediate steps in the production of the security element 62.
- the security element 62 is constructed similarly to the security element 12 already described in connection with FIG. 2, so that elements that correspond to one another are each designated with the same reference numerals.
- the security element 62 contains a flat, transparently colorless carrier 18, the area of which defines an x-y plane and a z-axis perpendicular to it.
- a multicolored reflective surface area is arranged on the carrier 18 and contains an embossed structure area with micromirror embossments with two different height levels.
- a first embossed area 24 is provided by micromirror embossings, the base areas of which are at a height H 1 above the carrier 18, while a second embossed area is given by micromirror embossings 34 whose base areas are at a height H 2 > H 1 above
- the micromirror embossings or micromirror arrangements 24, 34 each contain, as in the exemplary embodiment of FIG.
- the angles of inclination of the micromirrors in the exemplary embodiment are selected such that the micromirror arrangements 24, 26 produce the arched three-dimensional impression of the motif 64 and the rolling bar effect of the sub-area 66.
- the sizes and heights of the micromirrors can be selected as in the exemplary embodiment in FIG. 2. While the embossed lacquer layer 22 in which the micromirror arrangement 24 is embossed is transparent, colorless, the embossed lacquer layer 32 in which the micromirror arrangement 34 is embossed is colored in a translucent blue. Both micromirror arrangements 32, 34 are provided with a uniform color coating 26, which in the exemplary embodiment in FIG.
- the desired visual contrast of the micromirror arrangements 24, 34 from the different viewing positions of the observer is created by the interaction of the different color effects of the embossing lacquer layers 22, 32 with the color effect of the uniform color coating 26.
- the two micromirror arrangements 24, 34 are in the exemplary embodiment in FIG each arranged directly adjacent to one another in the surface area of the security element 62.
- the sub-area 66 is formed, for example, by a 5 mm wide and 2 cm long curved strip within a 2.5 ⁇ 2.5 cm 2 surface area 64.
- the visual impression in area 64 i.e. outside the overlap Coverage area 66 is determined by the micromirror arrangement 24 lying at height level Hi and thus only by the color effect of the silver layer 26.
- the viewer therefore perceives the silvery shiny motif 64 generated by the micromirror arrangement 24, while within the Subarea 66 the blue-metallic rolling bar effect appears, in which when the bank note 10 is tilted a blue reflective bar appears to run back and forth along the curved strip. Since the height difference between the two micromirror arrangements 24, 34 is in the range of a few micrometers, it is imperceptible to the viewer, so that the two different colored motifs and the different effects 64, 66 are arranged next to one another in exact register seem to be.
- the security element 62 also has a smaller sub-area 68 in the area 64, which is designed in the form of the numerical value “10” and in which the color coating 26 is cut out. Due to the lack of color coating and the transparency of the other layers present in the sub-area 68, a negative identifier is created in the security element 62 there.
- the sub-area 68 forms a transparent see-through window in the bank note or it allows a view of the surface of the bank note.
- an embossing tool not shown.
- the embossing lacquer layer 22 is then hardened.
- a second, translucent blue colored embossing lacquer layer 32 is printed onto the first embossing lacquer layer 22 with a printing cylinder (not shown), as shown in FIG.
- the second embossing lacquer layer 32 is then provided with the micromirror embossing 34 producing the rolling bar effect using an embossing tool (not shown).
- an embossing tool not shown
- the embossing lacquer layer 32 is then hardened.
- washing ink 70 is printed on in the subareas 68 which are to be demetallized subsequently, as shown in FIG. 6 (d).
- a uniform, full-surface metal coating 26 is then applied to the overall structure produced in this way, which is formed by the first relief structure 24 of the first embossing lacquer layer 22, the second relief structure 34 of the second embossing lacquer layer 32 present in the overlap area 66 and the washing ink 70 printed in the subregions 68 , for example, the above-mentioned silver layer applied as shown in Fig. 6 (e).
- FIG. 7 shows a modification of the exemplary embodiment of FIG. 2, in which both the motif 14-A (value number “10”) and the coat of arms motif 14-B appear with a colored impression.
- a continuous, translucent color layer 82 is provided on the side of the carrier 18 facing away from the micromirror embossments 24, 34.
- the motif 14-A of the micromirror embossing 24 When viewed, the motif 14-A of the micromirror embossing 24 then appears shiny with a first colored color due to the combined effect of the color layer 82 and the metallization 26, and the motif 14-B of the micromirror embossing 34 due to the combined effect of the color layer 82, the ge - colored embossing lacquer layer 32 and the metallization 26 glossy with a second colored color, which is produced by a subtractive color mixture of the colors of the colored layer 82 and the embossing lacquer layer 32.
- the embossing lacquer layer 32 is colored translucent cyan and the colored layer 82 is colored translucent yellow, the motif 14-A appears with a shiny yellow color and the motif 14-B appears due to the subtractive color mixing of cyan and yellow with a shiny green color.
- the color layer 82 can also be provided between the carrier 18 and the first embossing lacquer layer 22.
- a glaze-colored first embossing lacquer layer 22 or a glaze-colored carrier film 18 can also be used. These measures can also increase the variety of colors in the appearance. Even if the exemplary embodiments were specifically described with metal layers and translucent colored inks for illustration, it goes without saying that the other colors mentioned above can also be used for the color coating 26 and the embossing lacquer layers 22, 32.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102019003947.5A DE102019003947A1 (de) | 2019-06-06 | 2019-06-06 | Verfahren zum Herstellen eines optisch variablen Sicherheitselements |
PCT/EP2020/025253 WO2020244806A1 (de) | 2019-06-06 | 2020-05-29 | Verfahren zum herstellen eines optisch variablen sicherheitselements |
Publications (1)
Publication Number | Publication Date |
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EP3980274A1 true EP3980274A1 (de) | 2022-04-13 |
Family
ID=71078479
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EP20731792.6A Pending EP3980274A1 (de) | 2019-06-06 | 2020-05-29 | Verfahren zum herstellen eines optisch variablen sicherheitselements |
Country Status (5)
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US (1) | US11807029B2 (de) |
EP (1) | EP3980274A1 (de) |
CN (1) | CN113950415B (de) |
DE (1) | DE102019003947A1 (de) |
WO (1) | WO2020244806A1 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
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DE102020005522A1 (de) | 2020-09-09 | 2022-03-10 | 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 |
DE102022002470A1 (de) * | 2022-07-06 | 2024-01-11 | Giesecke+Devrient Currency Technology Gmbh | Optisch variables Flächenmuster, Wertdokument mit optisch variablem Flächenmuster und Verfahren zur Herstellung eines optisch variablen Flächenmusters |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
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CH604279A5 (de) * | 1976-12-21 | 1978-08-31 | Landis & Gyr Ag | |
EP0732667B1 (de) * | 1995-03-16 | 1997-05-21 | Landis & Gyr Technology Innovation AG | Optischer Informationsträger |
US6060143A (en) * | 1996-11-14 | 2000-05-09 | Ovd Kinegram Ag | Optical information carrier |
DE102005061749A1 (de) * | 2005-12-21 | 2007-07-05 | Giesecke & Devrient Gmbh | Optisch variables Sicherheitselement und Verfahren zu seiner Herstellung |
DE102006032679A1 (de) * | 2006-07-13 | 2008-01-17 | Giesecke & Devrient Gmbh | Verfahren zur Herstellung eines Sicherheitselements |
EP2068208B1 (de) * | 2006-09-27 | 2015-03-04 | Toppan Printing Co., Ltd. | Optisches element, artikel mit etikett, das darauf befestigt ist, optischer satz und unterscheidungsverfahren |
DE102008036480A1 (de) | 2008-08-05 | 2010-02-11 | Giesecke & Devrient Gmbh | Verfahren zur Herstellung von Sicherheitselementen mit gepasserten Motivschichten |
DE102011102999A1 (de) * | 2011-05-24 | 2012-11-29 | Leonhard Kurz Stiftung & Co. Kg | Folie und deren Herstellungsverfahren |
DE102012020257A1 (de) | 2012-10-16 | 2014-04-17 | Giesecke & Devrient Gmbh | Optisch variables Flächenmuster |
GB201301790D0 (en) * | 2013-02-01 | 2013-03-20 | Rue De Int Ltd | Security devices and methods of manufacture thereof |
DE102013002137A1 (de) | 2013-02-07 | 2014-08-07 | Giesecke & Devrient Gmbh | Optisch variables Flächenmuster |
DE102014001688A1 (de) * | 2014-02-07 | 2015-08-13 | Giesecke & Devrient Gmbh | Herstellung eines Sicherheitselements mit Farbänderungseigenschaften |
DE102014001842A1 (de) * | 2014-02-11 | 2015-08-13 | Giesecke & Devrient Gmbh | Verfahren zum Herstellen eines Sicherheitselements mit Negativschrift und daraus erhältliches Sicherheitselement |
DE102016010616A1 (de) * | 2016-09-01 | 2018-03-01 | Giesecke+Devrient Currency Technology Gmbh | Sicherheitselement mit mehreren Sicherheitsmerkmalen |
EP3466711B1 (de) * | 2017-10-05 | 2020-06-03 | Giesecke+Devrient Currency Technology GmbH | Zweiseitiges transparentes fenstermerkmal mit dichroitischen farbstoffen |
DE102018103236A1 (de) * | 2018-02-14 | 2019-08-14 | Leonhard Kurz Stiftung & Co. Kg | Sicherheitselement und Verfahren zur Herstellung eines Sicherheitselements |
-
2019
- 2019-06-06 DE DE102019003947.5A patent/DE102019003947A1/de not_active Withdrawn
-
2020
- 2020-05-29 CN CN202080040877.7A patent/CN113950415B/zh active Active
- 2020-05-29 US US17/615,796 patent/US11807029B2/en active Active
- 2020-05-29 EP EP20731792.6A patent/EP3980274A1/de active Pending
- 2020-05-29 WO PCT/EP2020/025253 patent/WO2020244806A1/de active Application Filing
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US11807029B2 (en) | 2023-11-07 |
CN113950415B (zh) | 2023-11-21 |
WO2020244806A1 (de) | 2020-12-10 |
DE102019003947A1 (de) | 2020-12-10 |
US20220314681A1 (en) | 2022-10-06 |
CN113950415A (zh) | 2022-01-18 |
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