EP3233512A1 - Optisch variables durchsichtssicherheitselement - Google Patents
Optisch variables durchsichtssicherheitselementInfo
- Publication number
- EP3233512A1 EP3233512A1 EP15804317.4A EP15804317A EP3233512A1 EP 3233512 A1 EP3233512 A1 EP 3233512A1 EP 15804317 A EP15804317 A EP 15804317A EP 3233512 A1 EP3233512 A1 EP 3233512A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- facets
- security element
- angle
- surface pattern
- color
- 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
Links
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
- B42D25/29—Securities; Bank notes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/30—Identification or security features, e.g. for preventing forgery
- B42D25/324—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
-
- 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
- B42D25/364—Liquid crystals
-
- 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
Definitions
- the invention relates to an optically variable see-through security element for securing valuables, having a planar, optically variable surface pattern, which shows in phantom a colored appearance with a viewing angle-dependent multi-color color change.
- a further solution consists of producing colors with transparent or semitransparently coated subwavelength structures in the transmitted and transmitted light which change when the structures are tilted.
- subwavelength structures are very demanding in their production and difficult to produce in the required large-scale industrial scale.
- the object of the invention is to specify a see-through safety element of the type mentioned at the outset, which avoids the disadvantages of the prior art.
- the see-through security element should combine an appealing visual appearance with high security against counterfeiting and should ideally be able to be produced in the commercial scale required in the security area.
- the optically variable area pattern includes a plurality of substantially radiation-optical facets whose orientation is characterized in each case by an angle of inclination ⁇ against the plane of the area pattern lying between 0 ° and 45 ° and by an azimuth angle in the plane of the area pattern,
- the facets are provided with an interference layer with a color change depending on the viewing angle
- the optically variable surface pattern contains at least two partial regions each with a multiplicity of identically oriented facets, wherein the facets of the at least two partial regions differ from one another in the angle of inclination to the plane and / or in the azimuthal angle in the plane.
- the subareas represent in each case just the areas of similarly oriented facets.
- the facets of a subarea have not only the same orientation but also the same shape and size.
- the area occupied by each subregion on the optically variable surface pattern is in advantageous embodiments at least 50 times, preferably at least 100 times, particularly preferably at least 1000 times larger than the area occupied by a single facet of this surface area on average.
- the sections usually contain a very large number of individual facets.
- the facets of the at least two partial regions differ in inclination angle against the plane by 5 ° or more, preferably by 10 ° or more, particularly preferably by 20 ° or more.
- the facets of the at least two subregions differ in the azimuth angle in the plane by 45 ° or more, preferably by 90 ° or more, in particular by 180 °.
- the facets of the surface pattern are preferably formed by flat surface pieces, which are each characterized by their shape, size and orientation.
- the orientation of a facet is indicated by the inclination ⁇ against the plane of the surface pattern and by an azimuth angle ⁇ in the plane of the surface pattern.
- the azimuth angle 0 is the angle between the projection of the normal vector of the facet on the plane of the surface pattern and a reference direction in the plane. Since the azimuth angle 0 depends on the choice of the reference direction, its absolute value has no meaning, but the difference of the azimuth angle of different sub-ranges, since this describes the different relative orientation of the facets in the associated sub-areas. In principle, it is also possible, although not currently preferred, to provide curved facets.
- the orientation can be through a normal vector averaged over its surface and thus an average angle of inclination ⁇ and an average azimuth angle ⁇ are given.
- the dimension of the facets is preferably so large that no or hardly diffraction effects occur, so that the facets essentially act only radiation-optical.
- the facets advantageously have a smallest dimension of more than 2 ⁇ m, preferably of more than 5 ⁇ m, in particular of more than 10 ⁇ m.
- the facets preferably have a height below 100 ⁇ , preferably below 50 ⁇ , in particular less than 10 ⁇ on.
- the facets can be arranged regularly, for example in the form of a 1- or 2-dimensional periodic grid, for example a sawtooth grid, or else aperiodically.
- Another possibility to suppress unwanted diffraction effects is to aperiodically offset the facets in their height above the surface area.
- an aperiodic displacement of the facets there is no simple, regular relationship between the heights of adjacent facets, so that constructive interference of the light reflected at neighboring facets and thus the emergence of a superimposed diffraction pattern are reliably prevented. Details of such aperiodic displacement of the document
- a first example of an advantageous interference layer is a thin film Element having semitransparent metal layers and a dielectric spacer layer, in particular with a structure absorber / dielectric / absorber, wherein as absorber layers, for example metals such as Ag, Au, Cr or Al can be used and can be used as a dielectric layer SiO 2 , MgF 2 or polymers.
- Dielectric layer systems, in particular multilayer systems are also suitable as interference layer, in particular layer structures with at least one high-index layer, such as TiO 2 or ZnS, preferably combined with at least one low-index layer, such as SiCh or MgF 2 .
- the thin-film element may also contain semiconducting layers, such as Si, for example, a thin-film structure may be the layer sequence
- Si / Si0 2 / Si can be used.
- dielectric spacer layers it is also possible, for example, to use polymers instead of oxides.
- liquid-crystalline layers in particular with color-changing cholesteric liquid crystals, can also be used as the interference layer.
- the entire optically variable surface pattern is advantageously provided with the same interference layer, which is applied simultaneously to all facets.
- the interference layer can be further structured by subsequent process steps in order to produce interference-layer-free regions.
- the interference layer depending on the inclination of the facets may have a locally different thickness, as explained in more detail below.
- the interference layer has a
- the facets are provided with an interference layer whose layer thickness varies with the inclination angle ⁇ of the facets, in particular decreases with increasing inclination angle ⁇ .
- the present inventors have surprisingly found that such an interference layer can produce particularly strong color differences between facets of different inclinations. As a result, on the one hand, a particularly large color palette for the colored appearances is available, which even allows the production of true color images, on the other hand can be realized in this way strong color change when tilting the surface pattern.
- Such a varying layer thickness of the interference layer can be achieved, for example, with directional coating methods, such as vacuum deposition methods.
- the angle of inclination of the facets leads to an increase in the effective surface area, so that less material per unit area is deposited on inclined facets, and the resulting layer thickness thus strongly depends on the angle of inclination of the facets.
- the facets are advantageously embossed in an embossing lacquer layer having a first refractive index.
- a lacquer layer having a second refractive index which differs from the first refractive index of the embossing lacquer layer by less than 0.3, in particular by less than 0.1, is applied over the interference layer. Due to this essentially identical refractive index of the two paint layers, incident light traverses the security element independently of the local inclination angle ⁇ of the facets essentially without directional deflection, thus ensuring a uniform distribution of brightness in the plane of the surface pattern.
- the at least two partial regions are arranged in the form of a motif, wherein the optically variable surface pattern shows the motif formed by the partial regions in review, at least in certain tilted positions of the security element with two or more different colors.
- the inclination angles ⁇ and the azimuth angles ⁇ of the facets and the interference layer in the two subregions are advantageously matched to one another such that the subregions display the same colors in a certain tilted position and different colors in other tilted positions.
- the security element shows a motif that arises when tilted from a homogeneous appearing surface or disappears into a seemingly homogeneous surface.
- both the inclination angles ⁇ of the facets, the azimuth angles ⁇ of the facets and the interference layer must be coordinated in the subregions such that the desired color effect is achieved.
- the optically variable surface pattern contains at least three partial regions, which are arranged in the form of a background region and two foreground regions, and in which the inclination angles ⁇ and the azimuth angles ⁇ of the facets and the interference layer are matched to one another such that the optically variable surface pattern in review in a first tilted position shows a first motif, in which the first foreground area with a subject color and the second foreground area and the background area appear with a different background color of the subject color, and
- the optically variable surface pattern contains at least four partial regions which are arranged in the form of a background region, two foreground regions and an overlapping region, and in which the inclination angles ⁇ and the azimuth angles ⁇ of the facets and the interference layer are coordinated with one another such that the optically variable surface pattern in transparency
- first tilt position shows in a first tilt position a first motif, in which the first foreground area and the overlap area with a subject color and the second foreground area and the background area appear with a different background color from the subject color
- second tilt position shows a second motif, wherein the second The foreground area and the overlapping area with the subject color and the first foreground area and the background area with the background color appear.
- the optically variable surface pattern advantageously contains at least two partial regions in which the facets have the same inclination angle ⁇ but have azimuth angles affordauer differing by 180 °.
- the inclination angles ⁇ are advantageously greater than 5 °, particularly preferably greater than 10 °, and are for example 15 °, 20 ° or 25 °.
- the optically variable surface pattern contains at least four partial regions, then it is advantageously provided that the optically variable surface pattern contains a first and second partial region in which the facets have the same inclination angle ao but azimuth angles um differing by 180 °, and further a third and fourth sub-area, in which the facets have different angles of inclination ⁇ or a 2 and in which the azimuth angle ⁇ differs by 90 ° or 270 ° from the azimuth angle of the first and second sub-area.
- the inclination angles ao are advantageously greater than 5 °, particularly preferably greater than 10 °, and are for example 15 °, 20 ° or 25 °. As explained in more detail below, can be realized in this way in a particularly simple manner, a tilt image with two different motifs.
- the optically variable surface pattern contains at least three subregions in which the inclination angle ⁇ and the azimuth angle ⁇ of the facets and the interference layer are matched to one another such that the subregions appear in a tilted position as viewed in red, green or blue. These colors are preferably tilted security element, that is generated in a vertical perspective view.
- the optically variable surface pattern may additionally have in the subregions a black mask which has been matched to the inclined facets and which serves to adjust the translucency of the facets in the respective subregions.
- the three subregions may, if appropriate, be matched with the one
- Black mask while advantageously represent the color separations of a true color image. In this way can be displayed in the selected tilt position in perspective realistic appearing true color images.
- the invention also includes a data carrier with a see-through security element of the type described, wherein the see-through security element is preferably arranged in or above a window region or a through opening of the data carrier.
- the data carrier may in particular be a value document, such as a banknote, in particular a paper banknote, a polymer banknote or a film composite banknote, but also an identity card, such as a credit card, a bankcard, a cashcard, an authorization card, an identity card or a pass personalization page.
- the invention further includes a method of fabricating an optically variable see-through security element in which a substrate is provided and the substrate is provided with a planar, optically variable area pattern which shows in phantom a colored appearance with a viewing angle dependent multicolor color change.
- the optically variable surface pattern is generated with a plurality of substantially radiation-optical facets whose orientation is in each case by an inclination angle ⁇ against the plane of the surface pattern, which lies between 0 ° and 45 °, and by a Azimuth angle ⁇ is characterized in the plane of the surface pattern, the facets are provided with an interference layer with a viewing angle-dependent color change, and the optically variable surface pattern is generated with at least two subregions, each with a plurality of identically oriented facets, wherein the facets of distinguish at least two subregions from one another in the angle of inclination to the plane and / or in the azimuth angle in the plane.
- the facets are coated with the interference layer in a directed coating process, in particular in a vacuum vapor deposition process.
- FIG. 1 shows a schematic representation of a banknote with an optically variable transparent security element according to the invention
- Fig. 2 shows schematically the layer structure of the security element of
- FIG. 3 shows schematically a calculated color spectrum of facets with a three-layer interference coating with a first, 25 nm thick Ag layer, a Si0 2 spacer layer of thickness d and a second, likewise 25 nm thick Ag layer, plotted as a function of the thickness d and the angle ⁇ of light incident on the interference coating, to explain the occurring tilting the security element of Fig. 2 with the interference coating of Fig.
- FIG. 1 shows a schematic representation of a banknote 10 having an optically variable transparent protective element 12 according to the invention, which is arranged above a continuous opening 14 of the banknote 10.
- the security element 12 shows in phantom a colored appearance with a motif 16, 18, which has a viewing angle-dependent multicolor color change.
- the security element 12 shows a homogeneous, monochromatic yellow area in the vertical viewing perspective, in which the value "10" of the foreground area 16 is not recognizable because of the lack of color difference to the background 18.
- the security element 12 is tilted to the right or left (reference numerals 20-R, 20-L) and viewed at an oblique angle, the colors of the foreground 16 and the background 18 change in different ways, so that the value "10" clearly stands out in the tilted position due to the color difference.
- the see-through color of the background area 18 changes from yellow to green
- the see-through color of the foreground area 16 changes from yellow to red.
- Tilting to the left 20-L results in reverse staining. Changes, that is, the see-through color of the background area 18 changes from yellow to red, while the see-through color of the foreground area 16 changes from yellow to green.
- the security element 12 thus shows very different visual appearances when viewed from different viewing directions, which is unexpected for the viewer, especially in the case of see-through elements, and therefore has a high degree of attention and recognition value.
- FIG. 2 shows a schematic cross-section of the layer structure of the security element 12 according to the invention, with only those for the explanation of FIG
- the security element 12 has a planar, optically variable surface pattern which contains a multiplicity of essentially radiation-optical facets 32.
- the facets 32 are formed by flat surface pieces and are each characterized by their shape, size and orientation.
- the orientation of a facet 32 is indicated by the inclination ⁇ to the plane 30 of the surface area and by an azimuth angle ⁇ in the plane 30, wherein the azimuth angle ⁇ is the angle between the projection of the normal vector 46, 48 of a facet 32 the level 30 and a reference direction is Ref.
- the facets 32 of the surface pattern are embossed into a preferably transparent embossing lacquer 34 and in the exemplary embodiment have a square outline with a dimension of 20 ⁇ m x 20 ⁇ m.
- the facets 32 are further provided with an almost transparent or at least semitransparent interference coating 36 which, when viewed, produces a color impression dependent on the viewing angle.
- the interference coating 36 may be formed, for example, of a three-layer thin-film structure having two metallic semitransparent layers, such as aluminum, silver, chromium, gold, or copper and an intervening dielectric spacer layer, such as SiO 2 , MgF 2 , or a polymer.
- the thickness of the interference coating 36 is independent of the inclination angle ⁇ of the facets 32.
- a further lacquer layer 38 is applied, which has substantially the same refractive index as the lacquer layer 34, which ensures that incident light traverses the layer sequence of the security element 12 regardless of the local inclination angle ⁇ of the facets 32 substantially without directional deflection and so produces a uniform brightness distribution in the plane of the surface pattern.
- the interference coating 36 of the facets produces a color impression in transmitted light that depends on both the direction of incidence of the light relative to the plane normal of the optically variable area pattern and the individual inclination angle of the facets 32, since both factors influence the angle of incidence of the light relative to the normal of the interference coating 36 , 3 schematically shows a calculated color spectrum of facets 32 having a three-layered interference coating 36 with a first, 25 nm-thick silver layer, an SiO 2 spacer layer of thickness d and a second , 25 nm-thick silver layer.
- the transmission color is initially outside the visible spectral range and then changes to blue (B), green (G) and yellow (Y) to red (R) for spacer layers with layer thicknesses in Range of about 130 nm. After an area without visible see-through color repeats this sequence at higher layer thicknesses from 200 nm to about 350 nm.
- the subregions 16, 18 can therefore not be distinguished in transparency and the security element 12 appears as a monochrome, homogeneous surface.
- the interference coating 36 therefore generates a red transparent color in the partial region 16.
- the interference coating 36 therefore generates a green transmission color in the subregion 18.
- the monochromatic homogeneous color impression at normal incidence of light in Fig. 4 (a) is a consequence of the equality of the inclination angle ⁇ in the two partial areas 16, 18 with simultaneous azimuth angle difference of 180 °.
- the inclination angle and / or azimuth angle can also be achieved that adjusts the homogeneous color impression in other viewing directions.
- the result is a monochrome homogeneous color impression at a tilt angle of 15 ° to the left.
- a security element 60 according to the invention can also show a tilted image in which different motifs are visible in different tilt positions, as explained below with reference to FIG. 5.
- 5 (a) shows, in plan view, the division of the optically variable area pattern of the security element 60 into three partial areas 62, 64, 66, which take the form of a background area 62, a first foreground area 64 (triangle) and a second foreground area 66 (circle). are arranged.
- Fig. 5 further shows in (b) to (d) the security element 60 in cross section in different tilted positions.
- the security element 60 is fundamentally constructed like the security element 12 of FIG. 2, but contains three partial regions with different orientation of the facets 32.
- the light 40 is incident parallel to the plane normal 42 and therefore also falls perpendicular to the facets 32 of the background region 62, while being tangent both to the facets 32 of the first foreground region 64 and to facets 32 of the second foreground area 66 each includes an angle of 20 °.
- the background region 62 therefore appears orange in transmitted light, while the two foreground regions 64, 66 appear green.
- this tilted position only the motif of the second foreground region 66 is visible, since the motif of the first foreground region 64 merges with the background region 62 in the same color.
- the first and second foreground areas now exchange their roles.
- the motif of the first foreground region 64 is visible, since the motif of the second foreground region 66 merges with the background region 62 in the same color.
- a color change in a right / left tilting of the safety elements went out.
- other tilting directions for example an up / down tilting, can also be used for the color change.
- the foreground regions 64, 66 are spatially separated from one another in the plane of the surface pattern, that is to say they have no overlap. If tipping motives are to be realized with overlaps, this can be achieved, for example, by interleaving the subareas assigned to the motifs.
- the area pattern is broken down into narrow strips or small pixels which alternately display first foreground motif 64 and background motif 62 and second Foreground motif 66 and the background image 62 included.
- the dimensions of the small strips or pixels are in particular below 300 ⁇ or even below 100 ⁇ , so that the division of the surface pattern with the naked eye is not recognizable or at least not noticeable.
- the optically variable area pattern is divided into four subareas 82, 84, 86, 88, which are in the form of a background area 82, a first foreground area 84 (square without circle segment 88), a second foreground area 86 (circular disk without circle segment 88) and an overlap region 88 (circle segment) are arranged.
- the first foreground area 84 forms, together with the circle segment 88, the complete square as the first motif to be displayed
- the second foreground area 86 together with the circle segment 88 as the second motif to be represented forms the complete circular disk.
- the inclinations and azimuth angles of the facets in the four subregions are selected so that the security element 80 in a first
- Tilted position in transmitted light as the first motif to be displayed shows the complete square (first foreground area 84 and circle segment 88 together) with a uniform subject color and the remaining area pattern (second foreground area 86 and background area 82) with a background color different from the subject color.
- the security element 80 shows in transmitted light as the second motif to be displayed the complete circle (second foreground area 86 and circle segment 88 together) with the uniform subject color, while the remaining area pattern (first foreground area 84 and background area 82) appears with the background color.
- the inclination and the azimuth angle of the facets in the background region 82 are thus selected such that they produce the background color both in the first and in the second tilt position.
- the inclination and the azimuth angle of the facets in the first foreground Rich 84 are selected so that they produce the motif color in the first tilted position and the background color in the second tilted position, while the facets in the second foreground region 86 are selected such that they have the background color in the first tilted position and the second tilted position Create a subject color.
- the inclination and the azimuth angle of the facets are selected such that they produce the motif color both in the first and in the second tilt position.
- the required inclinations and azimuth angles in the various partial areas can be determined, for example, by the following procedure, wherein it is concretely assumed that the first tilting position results from tilting 90-O of the security element 80 by a specific angle from the horizontal upward second tilted position caused by a tilt 90-U of the security element 80 by the same angle down.
- the facets in the subareas 84, 86 have the same inclination angles ⁇ , while the azimuth angles ⁇ differ by 180 °. Because of the symmetry of the arrangement, this ensures that the first foreground area 84 in the first tilted position shows the same see-through color (subject color) as the second foreground area 86 in the second tilted position.
- the first foreground area 84 shows the background color in the second tilted position, as does the second foreground area 86 in the first tilted position.
- angles of inclination coated with the selected interference coating facets at an azimuth angle of 0 ° or 180 ° in the first tilt position, the subject color or the background color were also determined in a series of experiments at which angles of inclination coated with the selected interference coating facets at an azimuth angle of 0 ° or 180 ° in the first tilt position, the subject color or the background color.
- These angles of inclination generally depend on the type of interference coating, the dependence of the interference layer thickness on the angle of inclination of the facets and the refractive indices of the embedding lacquer layers, but can easily be determined by a simple series of experiments. For example, it follows that the facets in the first tilted position at an azimuth angle of 0 ° and an inclination angle CI show the subject color and at an inclination angle OH show the background color.
- the thickness of the interference coating was independent of the angle of inclination of the facets.
- a coating method is selected for applying the interference coating, in which the layer thickness achieved depends on the inclination of the facets. This can be achieved, for example, by a directed vacuum evaporation of the facets, with a vertical thickness resulting in a layer thickness which is essentially proportional to the cosine of the angle of inclination, ie
- FIG. 3 schematically shows a calculated color spectrum of coated facets at normal incidence of light on the plane of the surface pattern, wherein the interference coating is formed by a three-layer interference coating with a first, 25 nm thick silver layer, a SiO 2 layer.
- Spacer layer of the nominal thickness do and a second, also 25 nm thick silver layer is formed.
- the nominal thickness do is plotted on the abscissa, while the inclination angle ⁇ of the facets is plotted on the ordinate.
- any color can be represented as additive color mixing of these three primary colors.
- the subregions are formed for this purpose, for example, as in a conventional RGB display in the form of small pixels or stripes.
- the brightness of the color areas in the individual pixels must be able to be specifically adjusted.
- the color areas of individual pixels can be overprinted black or coated with an opaque metallization, the technological challenge being the exact registration of overprinting or of the coating.
- an optically variable area pattern for representing a true color image with a register-accurate black mask can be produced in the manner described with reference to FIG. 8.
- 8 shows in (a) to (e) in cross section various intermediate stages in the production of the optically variable area pattern 110, wherein in each case only a small section of the area pattern is shown, namely just a single color pixel 112 with a red color area 114-R, a green color area 114-G and a blue color range 114-B.
- the size of the color pixel 112 is for example 100 ⁇ x 100 ⁇ .
- elevations 116 are provided which later form the black area for each color area and whose area ratio to the facets is selected according to the desired brightness of the respective color area. If, for example, the red component in the color pixel 112 shown is to have a brightness of 70%, the facets occupy 70% and the elevations 30% of the total area of the color region 112-R.
- the embossed lacquer layer 34 is provided over the entire surface with the selected interference coating 36, for example with the abovementioned three-layer system comprising a first 25 nm thick silver layer, a nominally 330 nm thick SiO 2 spacer layer and a second 25 nm thick silver layer.
- the Si0 2 spacer layer is produced by means of directional coating methods, for example by vertical vapor deposition, so that the described dependence of the actual layer thickness of the spacer layer on the angle of inclination ⁇ of the facets is established.
- the interference coating 36 is removed only on the bumps 116.
- This can be done for example with a metal transfer method, as described in the document DE 10 2010 019 766 AI
- an etching resist may be printed over the entire area of the coated lacquer layer and be doctored off in such a way that the resist remains only in the faceted depressions and the interference coating 36 can be etched away from the non-resist-covered elevations.
- a blackened photoresist 118 is applied to the opposite side of the surface pattern, as shown in Fig. 8 (d), and exposed from the upper side through the partially coated surface pattern (reference numeral 120) as shown in Fig. 8 (e) ,
- the exposure dose is chosen so that the photoresist is removed during the exposure by the interference layer during development, the remains of the elevations 116 without interference layer exposed photoresist but stops.
- a black mask 122 is thus obtained on the back side of the surface pattern, which is blackened at precisely those spots where there are no facets 32 provided with an interference layer 36, as shown in Fig. 8 (f).
- the surface pattern of FIG. 8 (f) is then further processed by further method steps to form the finished security element, for example by applying a further lacquer layer 38 to the interference coating 36 and by applying further protective or functional layers.
- an auxiliary layer for example an opaque aluminum layer, which serves only to pattern the photoresist 118, may first be applied. After patterning photoresist 118 to create the black mask in the step of Fig. 8 (f), the auxiliary layer is completely removed and the desired interference layer 36 is fully applied.
- This variant offers the advantage that the interference coating neither in the exposure step ( Figure 8 (e)) must serve as a reliable exposure mask, nor that the interference coating must be well etched away ( Figure 8 (c)). Rather, an auxiliary layer optimized for these requirements can be selected, while the interference coating is selected only on the basis of the desired coloring properties.
- the black mask can also be produced by other methods, for example by metal transfer methods, etching methods or else directly or indirectly via laser ablation controlled by embossed structures.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102014019088.9A DE102014019088A1 (de) | 2014-12-18 | 2014-12-18 | Optisch variables Durchsichtssicherheitselement |
PCT/EP2015/002414 WO2016096094A1 (de) | 2014-12-18 | 2015-12-01 | Optisch variables durchsichtssicherheitselement |
Publications (2)
Publication Number | Publication Date |
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EP3233512A1 true EP3233512A1 (de) | 2017-10-25 |
EP3233512B1 EP3233512B1 (de) | 2019-03-06 |
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EP15804317.4A Active EP3233512B1 (de) | 2014-12-18 | 2015-12-01 | Optisch variables durchsichtssicherheitselement |
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US (1) | US10124621B2 (de) |
EP (1) | EP3233512B1 (de) |
CN (1) | CN107087404B (de) |
AU (1) | AU2015366007B2 (de) |
CA (1) | CA2963024C (de) |
DE (1) | DE102014019088A1 (de) |
WO (1) | WO2016096094A1 (de) |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
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DE102016015393A1 (de) * | 2016-12-22 | 2018-06-28 | Giesecke+Devrient Currency Technology Gmbh | Sicherheitselement mit reflektivem Flächenbereich |
JP2018114696A (ja) * | 2017-01-19 | 2018-07-26 | 凸版印刷株式会社 | 表示体 |
DE102017009226A1 (de) | 2017-10-04 | 2019-04-04 | Giesecke+Devrient Currency Technology Gmbh | Optisch variables Durchsichtssicherheitselement und Datenträger |
JP7334414B2 (ja) * | 2018-03-20 | 2023-08-29 | 凸版印刷株式会社 | 光学素子、転写箔、および、認証体 |
DE102018003030A1 (de) * | 2018-04-13 | 2019-10-17 | Giesecke+Devrient Currency Technology Gmbh | Sicherheitselement, Verfahren zum Herstellen desselben und mit dem Sicherheitselement ausgestatteter Datenträger |
DE102018118473A1 (de) * | 2018-07-31 | 2020-02-06 | Bundesdruckerei Gmbh | Lichtsteuerfolie, Dokument mit einer Lichtsteuerfolie und Verfahren zur Herstellung eines Dokumentes mit einer Lichtsteuerfolie |
RU2712940C1 (ru) * | 2018-12-26 | 2020-02-03 | Федеральное государственное казенное военное образовательное учреждение высшего образования "Военный учебно-научный центр Военно-воздушных сил "Военно-воздушная академия имени профессора Н.Е. Жуковского и Ю.А. Гагарина" (г. Воронеж) Министерства обороны Российской Федерации | Способ имитации оптико-электронного средства |
DE102019003214A1 (de) * | 2019-05-07 | 2020-11-12 | Giesecke+Devrient Currency Technology Gmbh | Dekorelement mit Mehrschichtaufbau und Dekoreinrichtung |
KR102214523B1 (ko) * | 2019-07-31 | 2021-02-10 | (주) 나노메카 | 위조 방지용 필름 구조물 |
CN112572015B (zh) * | 2019-09-30 | 2023-06-06 | 中钞特种防伪科技有限公司 | 光学防伪元件及防伪产品 |
JP7368192B2 (ja) * | 2019-11-15 | 2023-10-24 | ファナック株式会社 | 加工方法及び物品 |
DE102020000031A1 (de) * | 2020-01-03 | 2021-07-08 | Giesecke+Devrient Currency Technology Gmbh | Optisch variables Sicherheitselement |
DE102020000030A1 (de) * | 2020-01-03 | 2021-07-08 | Giesecke+Devrient Currency Technology Gmbh | Optisch variables Sicherheitselement |
EP3858606B1 (de) * | 2020-01-28 | 2022-09-07 | Cnbm Research Institute For Advanced Glass Materials Group Co., Ltd. | Farbiges fassadenelement mit verbundscheibenstruktur |
AT523814B1 (de) * | 2020-05-08 | 2022-08-15 | Hueck Folien Gmbh | Sicherheitselement |
DE102020005932A1 (de) * | 2020-09-28 | 2022-03-31 | Giesecke+Devrient Currency Technology Gmbh | Optisch variables Sicherheitselement mit reflektivem Flächenbereich |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4025673A (en) * | 1972-04-13 | 1977-05-24 | Reinnagel Richard E | Method of forming copy resistant documents by forming an orderly array of fibers extending upward from a surface, coating the fibers and printing the coated fibers and the copy resistant document resulting from said method |
CA2233720C (en) * | 1995-11-28 | 2005-10-18 | Rene Staub | Optically variable surface pattern |
DE102005027380B4 (de) * | 2005-06-14 | 2009-04-30 | Ovd Kinegram Ag | Sicherheitsdokument |
DE102005061749A1 (de) * | 2005-12-21 | 2007-07-05 | Giesecke & Devrient Gmbh | Optisch variables Sicherheitselement und Verfahren zu seiner Herstellung |
GB0613306D0 (en) * | 2006-07-04 | 2006-08-16 | Rue De Int Ltd | Security device |
DE102006050047A1 (de) * | 2006-10-24 | 2008-04-30 | Giesecke & Devrient Gmbh | Durchsichtssicherheitselement mit Mikrostrukturen |
DE102009053925A1 (de) | 2009-11-19 | 2011-05-26 | Giesecke & Devrient Gmbh | Sicherheitselement mit Mikrostruktur |
DE102010047250A1 (de) * | 2009-12-04 | 2011-06-09 | Giesecke & Devrient Gmbh | Sicherheitselement, Wertdokument mit einem solchen Sicherheitselement sowie Herstellungsverfahren eines Sicherheitselementes |
AU2014250641A1 (en) | 2009-12-04 | 2014-11-06 | Giesecke & Devrient Gmbh | Security element, value document comprising such a security element and method for producing such a security element |
DE102009056934A1 (de) * | 2009-12-04 | 2011-06-09 | Giesecke & Devrient Gmbh | Sicherheitselement, Wertdokument mit einem solchen Sicherheitselement sowie Herstellungsverfahren eines Sicherheitselementes |
DE102010019766A1 (de) | 2010-05-07 | 2011-11-10 | Giesecke & Devrient Gmbh | Verfahren zur Erzeugung einer Mikrostruktur auf einem Träger |
DE102010049600A1 (de) | 2010-10-26 | 2012-01-19 | Giesecke & Devrient Gmbh | Sicherheitselement mit optisch variablem Flächenmuster |
DE102011108242A1 (de) * | 2011-07-21 | 2013-01-24 | Giesecke & Devrient Gmbh | Optisch variables Element, insbesondere Sicherheitselement |
DE102011119598A1 (de) * | 2011-11-29 | 2013-05-29 | Ovd Kinegram Ag | Optisch variables Element |
DE102013002137A1 (de) * | 2013-02-07 | 2014-08-07 | Giesecke & Devrient Gmbh | Optisch variables Flächenmuster |
-
2014
- 2014-12-18 DE DE102014019088.9A patent/DE102014019088A1/de not_active Withdrawn
-
2015
- 2015-12-01 CN CN201580059746.2A patent/CN107087404B/zh active Active
- 2015-12-01 US US15/537,622 patent/US10124621B2/en active Active
- 2015-12-01 CA CA2963024A patent/CA2963024C/en active Active
- 2015-12-01 EP EP15804317.4A patent/EP3233512B1/de active Active
- 2015-12-01 AU AU2015366007A patent/AU2015366007B2/en active Active
- 2015-12-01 WO PCT/EP2015/002414 patent/WO2016096094A1/de active Application Filing
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CA2963024C (en) | 2019-06-25 |
CA2963024A1 (en) | 2016-06-23 |
US10124621B2 (en) | 2018-11-13 |
AU2015366007B2 (en) | 2018-03-08 |
DE102014019088A1 (de) | 2016-06-23 |
EP3233512B1 (de) | 2019-03-06 |
WO2016096094A1 (de) | 2016-06-23 |
CN107087404B (zh) | 2018-12-25 |
AU2015366007A1 (en) | 2017-06-01 |
US20180037049A1 (en) | 2018-02-08 |
CN107087404A (zh) | 2017-08-22 |
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