Security element for a value document, having an optically variable primary surface pattern and concealed secondary surface pattern, and method for production thereof

Abstract

A security element (1) for a value document, wherein the security element (1) comprises: an optically variable primary surface pattern (2) that has a metal layer (4) with a relief structure (4a); and at least one concealed secondary surface pattern (3) comprising a plurality of elements (6) that perforate the metal layer (4) and at least one luminescence layer (7) that is arranged at least in the region of the secondary surface pattern (3).

Description

[0001] Security element for a value document with an optically variable primary surface pattern and a hidden secondary surface pattern and method for its production

[0002] The invention relates to a security element for a value document with an optically variable primary surface pattern and a hidden secondary surface pattern and a method for its production.

[0003] Optically variable surface patterns are known in the prior art and are used as security features and / or security elements that realize motion effects, for example, using microreflectors. In particular, security elements are known in the prior art in which colors are generated using nanostructures with structural sizes in the sub-wavelength range.

[0004] A combination of micromirrors with nanostructures mounted on them can create colorful rolling and / or 3D effects (the "rolling bar" effect using microreflectors is shown in DE 10 2010 047 250 A1, and a 3D effect is shown in DE 10 2009 056 934 A1). The micromirrors essentially generate the rolling and / or 3D effect, and the nanostructures color these or can also create multi-colored effects. For example, the viewer is given the impression of a moving, colored motif. The publications WO 2015 / 078572 A1 and WO 2016 / 180522 A1 also show such exemplary motion effects. The microreflectors or microlenses are arranged relative to a main plane in such a way that the motif exhibits or depicts the motion effect when the security element is tilted and / or rotated.

[0005] Typically, as described, for example, in document WO 2021 / 028076 Al, such nanostructures are molded into a transparent embossing lacquer and coated with a metallic or high-refractive-index layer.

[0006] To improve counterfeit protection, security features and / or security elements sometimes have so-called Class 2 features, which can be read using tools such as a UV lamp.

[0007] It is an object of the present invention to provide a security element with alternative properties and effects. It is a further object of the present invention to provide a security element with alternative Class 2 features.

[0008] It is a further object of the present invention to provide a security element with high forgery security.

[0009] Another task is to make it difficult or even impossible to remove the security element from an object and / or a substrate without causing damage.

[0010] A further task is to ensure that the effect of the security element, which can be seen with the help of aids, appears particularly striking and / or aesthetic to the observer.

[0011] It is a further object of the present invention to provide a security element which is not perceived as a disturbing element and makes an object to be secured thereby appear more aesthetically pleasing.

[0012] Furthermore, it is an object to provide a corresponding method for producing a security element.

[0013] At least one of these problems is solved by the respective subject matter of the independent claims.

[0014] According to one aspect, a security element for a value document comprises an optically variable primary surface pattern that has or comprises a metal layer with a relief structure, in particular a microstructure, a nanostructure, and / or a sub-wavelength structure; and at least one hidden secondary surface pattern comprising a plurality of elements perforating the metal layer and at least one—preferably at least partially transparent—luminescent layer that is arranged at least partially in the region of the plurality of elements perforating the metal layer. The elements perforating the metal layer are also called perforating elements.

[0015] The security element has additional and / or alternative properties and effects with respect to the already known security elements. With respect to the already known security elements, the security element has, in particular, additional and / or alternative Class 2 features. With respect to the already known security elements, the security element has a high level of forgery security. With the aid of aids, the discernible effects of the security element appear particularly striking and / or aesthetically pleasing to the observer. Furthermore, the security element is not perceived as an intrusive element on a valuable document, a product and / or a substrate and makes the object to be secured with it appear more aesthetically pleasing.

[0016] The metal layer is an opaque layer which is opaque, i.e. impermeable, to light, and in particular to emitted light and light which stimulates luminescence (also known as “luminescence excitation”). The optically variable primary surface pattern can form a motif with optically variable properties. The motif can comprise an image of a real object, symbols, ornaments, fantasy elements and / or other motifs. The optically variable primary surface pattern can be visible to a viewer when exposed to incident light. This can be achieved, for example, by daylight which is or will be irradiated from the side of the security element on which the viewer is located. The optically variable primary surface pattern can be or become visible to the viewer in particular when exposed to visible light.The light radiated from the side of the security element facing the viewer can then be scattered, reflected and / or diffracted by the perforated metal layer with primary surface pattern in such a way that an optically variable motif appears which is dependent on the viewing angle.

[0017] The relief structure, in particular the microstructure, the nanostructure and / or the sub-wavelength structure can comprise an optically variable micro- and / or nanorelief, preferably with dimensions in and / or below the visible wavelength range, in particular holograms, micromirrors, microlenses and / or corresponding or other nanostructures.

[0018] The hidden secondary surface pattern is difficult for the observer to recognize, and preferably not at all, particularly in incident light with daylight and / or a white light source. The hidden secondary surface pattern corresponds to at least one of the luminescent layers together with the perforation of the metal layer, particularly in the perforation area and / or according to a predetermined pattern. The perforation can be created by punching out, etching away, or otherwise removing or de-metallizing the metal layer. The hidden secondary surface pattern can form a further motif and / or information by means of the perforating elements or the perforating structure or the perforating pattern. The perforating elements can form a substructure of the motif. The perforating elements can correspond to a grid.For example, the elements can have the shape of crosses (as sub-structural elements) and, as a whole, together represent a cross as a higher-level structure. The elements perforating the primary surface pattern essentially correspond to de-metallized areas of the metal layer, i.e. areas that are not covered and / or coated with the metal layer. Therefore, the metal layer of the primary surface pattern is perforated or incomplete. The perforating elements can be arranged regularly or chaotically in the surface. The majority of elements perforated into the metal layer or the majority of elements perforating the metal layer (shortly "perforating elements") form the substructure, as already mentioned, whereby the perforating elements together can form a higher-level (meaningful) motif. The hidden secondary surface pattern can also be machine-readable, i.e., an invisible emission (e.g.UV light) upon luminescence excitation that is detectable by a measuring device and / or a detector.

[0019] The luminescent layer can be arranged above and / or below at least part of the primary surface pattern and / or within the perforating elements or perforations or gaps. The luminescent layer can correspond to a phosphor layer. The areas of the security element, in particular the foil security element with the demetallized screening, can be backed with one or more fluorescent colors as one luminescent layer or as several luminescent layers. The luminescent layer can be excited in the invisible UV range and emit light in the visible wavelength range, so that the hidden secondary surface pattern becomes recognizable to the human eye. Additionally or alternatively, as already mentioned, the emitted light can also be in the invisible wavelength range and therefore (only) machine-readable.The hidden secondary surface pattern can also comprise a machine-readable security feature that emits light that is detectable, for example, in the invisible wavelength range, particularly in the UV range. The primary surface pattern can comprise an optical security feature that is detectable in the visible wavelength range.

[0020] The combination of the perforating elements (which correspond to demetallized areas in the metal layer) and the luminescent layer above, below, and / or between them has the effect of making the hidden secondary surface pattern, and possibly a superordinate motif formed from it, visible to the observer upon excitation by radiation, particularly UV radiation. The UV radiation can be irradiated onto the security element from the observer's side and / or from its back.

[0021] Furthermore, the perforation has the effect of making the hidden secondary surface pattern, and possibly a superordinate motif formed from it, visible to the viewer in transmitted light. In this case, light visible to the viewer passes from the back of the security element through the perforated elements. This visible light can be, for example, daylight and / or the light of a white light source.

[0022] In other words, under transmitted light and under the influence of luminescence excitation, such as UV light, a hidden secondary surface pattern and a hidden overarching motif can become visible on a metallized foil security element, which is formed from the multitude of small de-metallized areas of the hidden secondary surface pattern.

[0023] The security element, in particular a strip, so-called LEAD, and / or a patch, can therefore be provided with the Class 2 feature for further protection. A Class 2 feature is typically understood to be a security feature that can be authenticated using tools such as a UV lamp. The hidden secondary surface pattern therefore serves as a Class 2 feature or Class 2 security feature. A LEAD corresponds to a strip and can extend across the length and / or width of a valuable document, e.g., a banknote. A patch, on the other hand, is locally limited and can therefore be smaller in its dimensions (length and / or width) than the valuable document itself. An L-patch or L-LEAD corresponds to an applied and / or inserted patch or strip that has its own carrier or substrate. Such an L-patch or L-strip is applied and / or inserted onto / into a valuable document together with the carrier.A T-patch or T-strip corresponds to a patch or strip that is detached from a transfer carrier and applied to or into a target substrate and / or valuable document. A T-patch or strip can either have no carrier of its own or optionally have its own carrier.

[0024] The security element can have a sandwich structure which—without specifying the layering sequence—has the metal layer perforated with the elements of the hidden secondary surface pattern, with the relief structure of the optically variable primary surface pattern, and at least one luminescent layer. In other words, the security element can have a sandwich structure which has a perforated metal layer and at least one luminescent layer in the region of the holes in the metal layer. The sandwich structure can be created and / or arranged on a carrier, wherein the carrier can be removed from the sandwich structure. In addition to the two layers mentioned, several other functional layers of the sandwich structure can be present, which are described as possible embodiments somewhat later in the description.The at least one luminescent layer can be arranged directly above and / or below the perforated metal layer and can span the plurality of elements perforating the metal layer, so that the luminescent layer can be irradiated through the perforating elements, i.e. through the holes, and can emit luminescent radiation (also "emission radiation") through them, in such a way that a motif is recognizable to the viewer in transmitted light and / or luminescence excitation, which motif results from and / or is composed of the elements of the hidden secondary surface pattern perforating the metal layer, but is not recognizable in incident light with visible light.

[0025] The luminescent layer may comprise a phosphor layer, a fluorescent layer and / or a phosphorescent layer, wherein the fluorescent layer may be configured to fluoresce and the phosphorescent layer may be configured to phosphoresce.

[0026] Luminescence can be understood as a collective term for luminous phenomena that essentially exhibit no thermal radiation. If the light emits luminescent radiation immediately after excitation of the phosphor, i.e., within a period of a few microseconds after excitation of the phosphor medium, this is typically fluorescence. However, if the light is emitted with a longer delay after excitation, with the delay being in the range of seconds or more, this is phosphorescence. Specifically, excitation by UV light is described herein. However, this invention is not limited to this type of excitation.In general, the luminescent layer of this invention can be the following types of luminescence: photoluminescence, X-ray luminescence, sonoluminescence, radioluminescence, chemiluminescence, bioluminescence, luminescence of technical phosphors, such as in fluorescent lamps.

[0027] Photoluminescence is the most common and preferred luminescence used in this invention. A UV lamp for exciting the luminescent layer is simple and straightforward to operate, and the security element can be verified quickly and easily. Photoluminescence typically occurs during and / or after illumination or excitation with UV light, with the wavelength of the emitted radiation typically being longer than that of the exciting radiation, as energy is lost during the excitation.

[0028] The optically variable primary surface pattern can comprise an embossed layer, in particular an embossed lacquer layer, above and / or below which the metal layer is arranged. An embossed layer can comprise a polymer, for example a resin and / or a lacquer, into which a relief is incorporated. The relief is predetermined and its structure corresponds to the optically variable primary surface pattern. It can have a relief structure, such as a sub-wavelength structure, a nano- and / or microstructure, which, in particular after coating with a metal layer, produces an optically variable and viewing angle-dependent effect, such as an optically variable color impression and / or another optically variable effect, such as a walking effect, a 3D and / or floating effect, a hologram, a movement effect, or the like.

[0029] The metal layer can be a thin metal foil and / or a vapor-deposited, sputtered, and / or electrochemically applied metal layer. The metal layer can therefore serve as a mirror coating. A suitable reflector metal, such as aluminum, can serve as the metal.

[0030] The metal layer can be arranged directly or indirectly with an intermediate layer on, below, and / or above the embossed layer. The arrangement of a layer above or below another layer can generally be understood as an indirect or direct arrangement or layering.

[0031] The elements perforating (the metal layer) may also perforate the embossed layer and / or other layers, but this is not mandatory and is purely optional.

[0032] The security element may further comprise an opaque area surrounding the primary surface pattern.

[0033] The opaque area is an area that is essentially impermeable to visible light. The first hidden motif area and / or the second hidden motif area, and in particular the metal layer with the primary surface pattern and the hidden secondary surface patterns located therein, can therefore be embedded in the opaque (edge) area, which can, for example, appear particularly aesthetic.

[0034] The opaque region can have a single color or multiple colors that appear particularly aesthetically pleasing. The opaque region can also comprise a coating that includes and / or covers other elements, such as an adhesive layer and / or an electronic element. The opaque region can comprise an opaque layer or be formed by an opaque layer, wherein the opaque layer can serve as a substrate and / or support layer, in particular for the perforated metal layer. Otherwise, the opaque region can be formed from an opaque layer. In any case, the opaque region can be formed from an opaque layer that supports and / or stabilizes the first hidden motif area and / or the second hidden motif area and in particular the metal layer laterally and / or from the underside. This can thus prevent, for example, the metal layer from accidentally tearing at its sides.

[0035] The security element may further comprise a transparent area surrounding the primary surface pattern.

[0036] An at least partially transparent region that at least partially surrounds the primary surface pattern, i.e., the perforated metal layer, can create the impression for the observer that only the central element, namely the security element according to the invention, is arranged on the value document without any additional visible edge regions. Visible regions surrounding the central element, which may be perceived as distracting, are thus omitted, while at the same time, sufficient contact surface is provided to fix the security element to the value document and / or substrate. Therefore, this security element can be perceived as particularly aesthetic and not as a distracting element on a value document.

[0037] Especially in patches, a central area with optically variable features (such as color shift) including the opaque metal layers can be embedded in a transparent and / or opaque edge area.

[0038] The perforating elements can have at least one of the following shapes: geometric shapes, in particular triangular, rectangular, diamond-shaped, circular shapes, preferably ring-shaped or fully circular shapes, alphanumeric characters, symbols, ornaments, lines, and grids. Circular elements can also be understood as point-shaped elements, especially with a very small radius.

[0039] In general, the perforating elements can have individual shapes and, in their entirety and arrangement, can form a higher-order shape or structure. In other words, the plurality of perforating elements (the metal layer) can have a substructure, whereby the elements together can form a higher-order motif. For example, as already mentioned, small cross-shaped elements can form a higher-order cross. The shapes of the elements can preferably be recognizable as such for the viewer and have a corresponding dimension. For example, there can be uniform shapes, such as only circular shapes. However, there can also be different shapes, such as circular and rectangular.

[0040] The perforating elements can have a size—such as length and / or width—of 10-500 pm and preferably of 50-250 pm. Preferably, the length (or a maximum size in one direction) and width (or a minimum size in one direction) of the perforating elements are within the (or the preferred) range. Alternatively, only the width is within the (or the preferred) range. The circular shapes can, for example, each have a diameter of 10-500 pm and preferably of 50-250 pm. The dimensions of the perforating elements can be uniform or non-uniform. With these dimensions of the perforating elements, their shapes can still be visible or recognizable under transmitted light and / or luminescence excitation.The light reflected and / or scattered in incident light from the metal layer of the primary surface pattern does not overshadow the light emitted by the luminescence excitation of the luminescent layers and / or the transmitted light passing through the perforating elements, so that the observer recognizes the shapes of the perforating elements by the light passing through.

[0041] The perforating elements can have a lateral spacing from one another of 10-500 μm, preferably 50-250 μm. The spacing between the perforating elements is preferably greater than their size. The lateral spacing or side distance between two perforating elements can in particular be a distance between two mutually facing contour edges of two perforating elements. Here, the lateral spacings are selected such that they correspond to the shortest distance between two mutually facing contour edges of two perforating elements. Alternatively, the lateral spacings can also be the distances between the center points and / or geometric centers of gravity or centers. The spacings are preferably selected such that they can be perceived as individual perforating elements and their shape is still essentially recognizable.

[0042] In the area of ​​the perforating elements, the area ratio of the perforating elements (perforation area to perforated area) can preferably be 10% to 60%, preferably 20% to 49%, particularly preferably 20% to 42%.

[0043] The luminescent layer can be excitable at discrete wavelengths or in a continuous spectral range in the UV range. Preferably, the luminescent layer(s) can only be excited with light in the range from 315 nm to 405 nm, more preferably 350 to 400 nm. For example, excitation can occur at 254 nm, 395 nm, and / or 365 nm. The luminescent layer can comprise a luminescent material that can be excited in said wavelength ranges and consequently emits light that typically has a different, generally longer wavelength. Different luminescent materials with different excitation and / or emission wavelengths or frequencies can also be used. Furthermore, the security element can contain several luminescent layers with different excitation and / or emission wavelengths, which can be arranged, for example, next to one another, one above the other, and / or in a plane.Luminescent layers with different excitation and / or emission wavelengths are also referred to herein as luminescent layers of different types. The security element can then be read under the influence of multiple excitation wavelengths, providing further security against counterfeiting. Furthermore, broadband UV excitation can reveal a hidden secondary surface pattern exhibiting multiple emission colors, which is particularly aesthetically pleasing. One emission wavelength can also be in the visible range and another in the invisible range, allowing the visible emission to be detected by the observer and the invisible emission (machine-readable) by a device, providing additional security for verification.

[0044] At least in the area of ​​the hidden secondary surface pattern, in particular in the area of ​​the plurality of perforating elements, at least one semitransparent layer having a transparency of at least 25% can be arranged. At least one semitransparent layer can be arranged above and / or below the primary surface pattern, essentially covering the entire surface. The semitransparent layer can have a filtering effect so that certain wavelengths cannot pass through the layer. The semitransparent layer can additionally or alternatively also correspond to a protective layer.

[0045] At least a portion of the plurality of elements perforating the metal layer may be at least partially filled with an adhesive material, whereby the adhesive material may form island layers, and wherein the adhesive material may preferably comprise a UV-curing polymer.

[0046] The security element can then be applied to a valuable document in such a way that the adhesive material touches a surface of the valuable document and / or a substrate. If the adhesive material comprises a UV-curing polymer, the polymer can be cured after being applied to the valuable document by irradiation with a suitable wavelength. When the adhesive layer is irradiated by the plurality of perforating elements, a corresponding plurality of cured adhesion islands is created in the adhesive layer. The formation of adhesion islands is particularly suitable for combating counterfeit valuable documents, since removal of the security element cannot be carried out non-destructively. The multiple, more stable point-like fixation of the security element to a valuable document can reliably lead to the document tearing when attempted to be removed.Therefore, the security element cannot be transferred from one valuable document to another object without causing damage.

[0047] The adhesive material or the adhesive layer is preferably at least partially transparent, in such a way that it allows light for exciting the luminescent layer and thereby emitted light from the luminescent layer to pass through or transmits it and does not disturb or even hinder the function and effects of the security element according to the invention.

[0048] According to one aspect, a method for producing a security element comprises: arranging a metal layer over a substrate and / or a carrier, in particular a carrier foil, and forming a relief structure to produce an optically variable primary surface pattern; perforating or demetallizing the metal layer in the form of a plurality of perforating elements to produce a hidden secondary surface pattern; and arranging an at least partially transparent luminescent layer in the region of the plurality of perforating elements of the hidden secondary surface pattern. The method for producing the security element has all the advantages and effects of the security element in the corresponding embodiment.

[0049] The substrate can optionally be removable and / or strippable, so that the security element can be removed from the substrate after its manufacture and transferred to a valuable document. In this case, an adhesive layer can be present between the substrate and a (top / bottom) layer of the security element, or it can be applied after the substrate has been removed. The substrate can also already be part of the valuable document.

[0050] Forming the relief structure can comprise: arranging an embossing layer, in particular an embossing lacquer layer, over the substrate and in particular on the substrate or on another layer on the substrate; embossing the relief structure into the embossing layer; and applying the metal layer to the embossing layer. An embossing layer, in particular an embossing lacquer layer, for example a polymer, in particular a resin, is particularly well suited for introducing a relief structure (micro- and / or nano-structure and / or sub-wavelength structure), over which the metal layer is subsequently arranged to form the primary surface pattern.

[0051] The perforation and / or de-metallization of the metal layer may comprise at least one of the following processes: a washing process, an etching process, a laser ablation, a metal pigment printing with recesses, a metal transfer process, a punching, a mechanical and / or electrochemical removal, a peeling.

[0052] Alternatively, the metal layer can be applied, deposited, or arranged (for example, by vapor deposition) in such a way that, rather than a full-surface coating, a metal coating (also called "metallization") with predetermined gaps corresponding to the perforating elements of the hidden secondary surface pattern is created. A mask corresponding to the shape of the plurality of perforating elements can be applied prior to vapor deposition of the metal layer, which mask is later removed (peeled off, taken off, and / or etched away). Thus, a plurality of elements perforating the metal layer can be created as "shadows" during metallization or the coating with a metal.

[0053] The first luminescent layer and / or the second luminescent layer are preferably printed. One or both of the luminescent layers can be vapor-deposited.

[0054] The first and second luminescent layers can be arranged in a transparent region and / or a perforated region. The method can further comprise arranging a metal layer that comprises a relief structure corresponding to an optically variable surface pattern and / or is partially opaque and / or provided with perforating elements, so that one or more opaque regions and / or one or more perforated regions are created.

[0055] According to one aspect, a security element for a value document comprises: an optically variable primary surface pattern that is visible in incident light; and an element pattern that perforates the primary surface pattern, is visible in transmitted light and is or becomes visible upon luminescence excitation (in particular upon fluorescence excitation).

[0056] The perforating element pattern essentially corresponds to the majority of perforating elements of the secondary surface pattern described herein and has the property that, upon luminescence excitation, it emits light, in particular visible light, and, upon transmitted light, a part of the light is transmitted to the back of the security element.

[0057] This security element can have the aforementioned features according to another aspect and other embodiments described herein, without being explicitly mentioned as a combination herein. The optically variable primary surface pattern can form or be a motif with optically variable properties. The element pattern can have a substructure of perforating elements that interrupt or perforate the primary surface pattern, in particular a metal layer of the primary surface pattern. An at least partially transparent and luminescent, in particular fluorescent, material can be filled or applied in, above and / or below the perforating elements of the element pattern. The element pattern is only visible in transmitted light and upon luminescence excitation, in particular upon fluorescence excitation.

[0058] The term "transmitted light" is generally understood herein to mean that light, such as daylight, from the side of the security element facing away from the viewer (back side, "from behind") passes through the perforations of the secondary surface pattern and / or the element pattern. The element pattern can comprise a further motif and / or information formed by means of the perforating structure (substructure of perforating elements). The secondary surface pattern or the element pattern can therefore become visible to the viewer upon transmitted light incidence and upon light incidence of at least a specific excitation wavelength that can excite a liminescent material used.

[0059] The optically variable primary surface pattern can be formed by at least one motif layer with a relief structure, such as a microstructure, a nanostructure, and / or a sub-wavelength structure. The at least one motif layer can comprise: a metal layer; and preferably an embossed layer, above and / or below which the metal layer is arranged.

[0060] At least one at least partially transparent luminescent layer, in particular at least one fluorescent layer, can be arranged above and / or below the primary surface pattern, at least in the region of the element pattern.

[0061] In general, a security element can be an element that is applied to and / or incorporated into a substrate as a "strip" (e.g., end-to-end on a banknote), as a "lead," or as a "patch" (locally limited). A security element can be an element that is arranged, incorporated, and / or applied as a "thread" on and / or in a substrate and / or carrier. A security element can also be created directly on the target substrate, for example, a value document.

[0062] In general, security elements can be provided with or without their own substrate or carrier. The substrate or carrier can comprise a plastic carrier and / or a film, such as a PET film. The substrate or carrier can be transferred to a valuable document or previously present on a transport / production carrier. The substrate and / or carrier of the valuable document can comprise one or more paper layers or one or more plastic layers, or a combination of paper and plastic layers.

[0063] In general, a security feature of a security element can, for example, be a feature printed on or embedded in a substrate. A security feature can include features used to secure a banknote, such as printed IR / UV inks and / or luminescent layers and / or fibers.

[0064] The term “optically variable” essentially means that different impressions become visible or recognizable to the viewer depending on a viewing angle, a viewing direction (including tilting / rotating), a side of the security feature (front / back), a reflection (top view) and / or a transmission (viewing through, i.e. against the light source), whereby an optically variable security feature can have a color effect, a moving motif, a floating motif and / or a running effect.

[0065] Fig. 1a is a schematic representation of a security element in incident light according to an embodiment;

[0066] Fig. 1b is a schematic representation of the security element of Fig. 1a in transmitted light;

[0067] Fig. 1c is a schematic representation of the security element of Fig. 1a under luminescence excitation;

[0068] Fig. 1d is a section of the schematic representation of the security element of Fig. 1c and shows schematically a part of the plurality of perforating elements of the secondary surface pattern;

[0069] Fig. 1e is a section from the representation of Fig. 1d according to a possible embodiment; Fig. 1f is a section from the representation of Fig. 1d according to an alternative embodiment to Fig. 1e;

[0070] Fig. 1g is a schematic representation of perforating elements shown in Fig. 1e;

[0071] Fig. 1h is a schematic representation of a security element under transmitted light and / or luminescence excitation according to a further embodiment;

[0072] Fig. 2a is a schematic representation of a layering of a security element as a T-stripe according to one embodiment;

[0073] Fig. 2b is a schematic representation of a layering of a security element as an L-stripe according to an embodiment;

[0074] Fig. 3 is a schematic representation of a layering of a security element as a patch according to an embodiment;

[0075] Fig. 4a is a schematic representation of a layering of a security element as an L-patch according to an embodiment;

[0076] Fig. 4b is a schematic representation of a layering of a security element as a T-patch according to an embodiment; and

[0077] Fig. 5 is a schematic representation of a method for producing a security element according to an embodiment.

[0078] Unless otherwise stated, the same reference numerals are used below for identical and equivalent elements and / or features. A redundant description of recurring features and, where appropriate, a redundant use of recurring reference numerals is partially avoided. The various embodiments and features of the figures described below are expressly combinable and should not be understood as complete versions.

[0079] Fig. 1a is a schematic representation of a security element 1 under incident light according to one embodiment. Fig. 1b is a schematic representation of the security element 1 of Fig. 1a under transmitted light, and Fig. 1c is a schematic representation of the security element 1 of Fig. 1a under luminescence excitation (also "excitation").

[0080] The security element 1 of this embodiment has the outer contour 1a of a star and can be used to authenticate and secure a valuable document and / or a valuable object. The security element 1 comprises an optically variable primary surface pattern 2 shown in Fig. 1a, which forms the shape of a star 2a that appears three-dimensional to the observer. In incident light, i.e. when visible light, for example white light, falls onto the security element 1 from the side of the observer, the star 2a emerging three-dimensionally from the surface appears as a motif of the primary surface pattern 2, as shown in Fig. 1a. The star 2a generated by the optically variable primary surface pattern 2 and appearing to emerge from the surface is indicated by the dashed line.The primary surface pattern 2 creates this three-dimensional motif 2a because it has a relief structure 4a with an overlying metal layer 4 that can create this motif. The relief structure 4a corresponds to a micro- and / or nanostructure comprising a plurality of mirror elements (such as micromirrors) and / or lens elements (such as microlenses) that can generate viewing-angle-dependent interference and thus such a 3D effect.

[0081] The metal layer does not fill the entire star shape of the security element 1, but forms a smaller star within the outer contour 1a of a star of the security element 1. The metal layer is surrounded by a transparent region 8, which forms the region between the outer contour 1a and the smaller star-shaped contour of the metal layer. The transparent region 8 can form a substantially see-through surface. The transparent (edge) region 8 completely surrounds the primary surface pattern 2 (as the inner region). In particular in embodiments as strips (optionally also for a patch), the primary surface pattern 2 is surrounded by exactly two lateral, transparent edge regions. This can, for example, prevent the metal layer from accidentally tearing and / or fraying at its sides.

[0082] In the transparent region 8, the security element can comprise, for example, the carrier layer and / or an embossing lacquer layer and / or a transparent protective layer and / or an adhesive layer. These layers can equally be present in the (region of the) primary surface pattern 2, where the metal layer is preferably located on the embossing lacquer layer and / or beneath the protective layer. The transparent region 8 can also partially comprise the first and / or second luminescent layer as a transparent luminescent layer. This can, for example, prevent the metal layer from accidentally tearing and / or fraying at its sides.

[0083] In the area of ​​the primary surface pattern 2, the metal layer may be perforated in some areas. The primary surface pattern 2 thus comprises an opaque area 4 and one (or more) perforation area(s) 5. These areas of the primary surface pattern are not visible in reflected light and are therefore not shown in Fig. 1a. The observer sees the motif of the primary surface pattern 2 in the opaque area 4 (and preferably in the perforation area 5). The transparent area 8 is preferably barely visible to the user in reflected light, i.e., in particular, not visible outside a glancing angle.

[0084] The embodiment shown is shown only as an example in the shape of a star, and any other shape is conceivable. The indicated three-dimensional effect of the optically variable primary surface pattern 2 is also shown only as an example, and the security element can instead or additionally have other effects, such as color effects, scrolling, floating, or moving effects.

[0085] In incident light alone, as shown in Fig. 1a, the hidden secondary surface pattern 3 cannot be recognized or perceived. Only in a situation (in transmitted light) as shown in Fig. 1b will a perforation area 5 be visible. Only in a situation (luminescence excitation) as shown in Fig. 1c will the hidden secondary surface pattern 3 be visible or perceived by the observer.

[0086] Fig. 1b shows the security element 1 viewed in transmitted light. The metal layer comprises an opaque region 4 and a perforation region 5 in which a plurality of perforating elements 6 are present. The elements 6 perforating the metal layer are thus illuminated "from behind" or from the side of the security element 1 facing away from the viewer. The perforating circular elements 6, regularly spaced from one another and with a uniform radius, form a substructure 15. The viewer can see that the majority of the perforating elements 6 together have the overarching shape 5a of a cross. The overarching shape 5a of the perforation region 5 with perforating elements 6 can also be referred to as a transmitted light motif of the security element.

[0087] In the area of ​​the primary surface pattern 2, there are one (or more) perforated areas 5 and at least one non-perforated or opaque area 4. The perforated area 5 is preferably surrounded by a non-perforated or opaque area 4. In the present case, the primary surface pattern 2 is in turn surrounded by the transparent area 8. The transparent area 8 is not visible in transmitted light (and preferably also in reflected light). The substructure 15 is preferably not visible to the naked eye (without aids) in transmitted light.

[0088] The hidden secondary surface pattern 3 comprises not only the plurality of elements 6 perforating the metal layer 4, but also at least one (preferably at least partially transparent) luminescent layer arranged in the region of the perforating elements 6. The luminescent layers can be at least partially

[0089] REVISED SHEET (RULE 91) ISA / EP partially transparent to allow light to be transmitted from the back. The at least one luminescent layer can be arranged above, below, and / or in at least part of the perforating elements 6. It can be present, in particular, in the perforation region 5 and the edge region 8.

[0090] In Fig. 1c, UV light comprising the corresponding excitation wavelength for exciting the luminescent material of the luminescent layer is radiated onto the area of ​​the secondary surface pattern 3. This can be radiated in transmitted light ("from behind", side of the security element 1 facing away from the viewer) and / or in reflected light ("from the front", side of the security element 1 facing the viewer). Since excitation and / or emission wavelengths of luminescent layers can differ, the hidden secondary surface pattern 3 can be excitable in certain areas with different excitation wavelengths or can comprise two hidden motif areas and / or can appear multi-colored, in particular when the luminescent layers are arranged at least partially next to one another beneath the perforating elements 6.

[0091] For example, a first luminescent layer can be present in the perforation area 5, and a second luminescent layer can be present over the entire surface (or both in the perforation area 5 and in the edge area 8). Accordingly, as indicated in Fig. 1c, the emission of both luminescent layers, i.e., the hidden motif area 3, is visible in the perforation area 5, and the emission of the second luminescent layer or its motif area 3b is visible in the transparent area 8. Furthermore, with luminescence excitation using only a first / second excitation wavelength, only the first / second motif area 3 / 3b could appear. If the emissions of the two luminescent layers can be distinguished by color for the observer, the security element is particularly easy to verify.

[0092] For the observer, the substructure remains invisible to the naked eye upon luminescence excitation. The observer sees the luminescence of the luminescent layers in the perforated area 5a (and in the transparent area 8) and can recognize the shape of the perforated area and / or, if applicable, the underlying subregions of the luminescent layers.

[0093] Fig. 1d is a section from the schematic representation of the security element 1 of Fig. 1c (or 1b) and schematically shows a part of the plurality of perforating elements 6 of the secondary surface pattern 3. It can be seen that the perforating elements 6 form a substructure 5 in which the perforating elements 6 are circular, have a uniform size, and are spaced uniformly apart. Fig. 1e and Fig. 1f are alternative sections from the representation of Fig. 1d according to

[0094] REVISED SHEET (RULE 91) ISA / EP of two possible embodiments. According to Fig. 1e, the perforating elements 6 can be circular and solid-surface or point-shaped. Light can therefore be transmitted and emitted within the entire area of ​​the circular perforating elements 6. Alternatively, the perforating elements 6 of Fig. 1e can be circular and annular. Thus, light can only be transmitted and emitted within the annular area of ​​the perforating elements 6.

[0095] A further advantageous effect of the perforating elements 6 will now be briefly described with reference to Fig. 1e and Fig. 1f. The security element can comprise an adhesive layer and / or be attached to a target substrate by means of an adhesive layer. The adhesive layer is preferably a (UV) radiation-curable adhesive layer. If the radiation-curable adhesive layer is now irradiated through the perforating elements 6 (with appropriate UV light), the adhesive layer only cures in places, namely in the region of the perforating elements 6. At the time of irradiation or transfer to a target substrate, an adhesive layer that is only cured in places (or in islands) is then created. Fig. 1e and Fig. 1f show a simplified illustration of the position of the adhesion islands 9 in the otherwise uncured adhesive layer, which correspond in size and position to the perforating elements 6 in the (overlying) metal layer 14.This is an optional possibility to prevent the security element 1 from being non-destructively removed from the target substrate and transferred to a substrate and / or object other than the original value document to which it is bonded via the adhesive islands 9. If the security element 1 is peeled off the value document to which it is better bonded in places (by means of the adhesive islands 9), the security element 1 or the target substrate will tear. All perforating elements 6 shown herein can optionally produce such cured adhesive islands 9 made of adhesive or another adhesive material, without the corresponding sections of the following or previous description explicitly mentioning this.

[0096] Fig. 1g is a schematic representation of perforating point-shaped elements 6 shown in Fig. 1e. A first perforating element 6a has a distance d a from a second perforating element 6b. The second perforating element 6b has a distance d b from a third perforating element 6c. The distances d i and d 2 between two adjacent perforating elements 6 are identical to each other. The distances d i and d 2 correspond to the shortest distances between the respective outer contours of two perforating elements 6. The size, i.e., the radius r, of the perforating elements 6 is also uniform.

[0097] REVISED SHEET (RULE 91) ISA / EP Fig. 1h shows an alternative to the previous perforating elements 6. Fig. 1h is therefore a schematic representation of a security element 1 upon luminescence excitation by means of UV-A light of the first and second excitation wavelengths (and / or in transmitted light) according to another embodiment.

[0098] Each perforating element 6 has the shape of a cross. The substructure 15 formed by the arrangement of the cross-shaped perforating elements 6, in turn, results in a cross as the higher-order shape 5a. The higher-order shape 5a and the shape of the perforating elements 6 are recognizable to the observer. In the example of Figure 2h, the individual perforating elements 6 could each be backed with different luminescent layers 7a, 7b, 7c, for example alternately or in a (multi-color) pattern. Perforating elements 6 can be designed (in terms of their size) in such a way that the shape of the perforating elements 6 is only recognizable to the observer with aids such as a magnifying glass or camera (Fig. 1c) or is already recognizable without aids, with the naked eye (Fig. 1h). Analogously, the substructure 15 can only be recognizable with aids such as a magnifying glass or camera, or can already be recognizable without aids, with the naked eye.

[0099] Alternatively, small microscopic symbols, such as "A," could also result in a macroscopic symbol, such as "A." Small microscopic symbols, such as "A," could also result in a microscopic symbol, such as "B." Furthermore, different symbols, such as "§&A+T &#...", could also result in or form a macroscopic number, such as "100."

[0100] Below, various possible layerings of the security element 1 for different embodiments are shown. The layerings always have two types of luminescent layers 7. a , 7b, which partially overlap with each other. The two luminescent layers 7 a, 7b have different excitation and / or emission wavelengths. In all subsequent embodiments, the previously described embodiments, in particular the regions, including motif regions, perforation region(s), opaque region(s), and / or transparent (edge) region(s), may be present, even if they are not addressed again or shown figuratively.

[0101] Fig. 2a is a schematic representation of a layering 200a of a security element 1 as a transfer strip (T-LEAD) on a transfer carrier 300 according to one embodiment. The layering 200a lies on the transfer carrier 300 in the form of a carrier film. A release layer 202 (and / or adhesion layer) is first applied to the transfer carrier 300. This release layer 202, on the one hand, connects the other layers to the transfer carrier 300, but, if necessary—namely, during the transfer of the security element to a target substrate—allows them to be removed from the transfer carrier 300. The transfer carrier 300 can thus be peeled off from the remaining layers. The transfer carrier 300 can therefore be considered not to belong to the security element 1.

[0102] The release layer 202 borders an embossed layer 4b with a relief structure 4a and, beneath it, a metal layer 14. The embossed layer 4b with the relief structure 4a and the metal layer 14 essentially forms the optically variable primary surface pattern 2. During production, the relief structure 4a can be incorporated into the embossed layer 4b. The metal layer 14 can then be applied and / or arranged for mirroring. The metal layer 14 has perforations in the form of the perforating elements 6. These perforations can be created after the application of the metal layer 14 according to the various methods described herein. The at least two luminescent layers 7a, 7b can be applied to the perforated metal layer 14, directly or indirectly with an intermediate layer. In the embodiment of Fig. 2a, three exemplary luminescent layers 7a, 7b are present in certain regions, which can in particular be fluorescent layers.Wherein a first luminescent layer 7a (luminescent layer 7a of the first type, indicated on the far left) with the first excitation wavelength and the first emission wavelength is not overlaid by the second luminescent layer 7b (luminescent layer 7b of the second type, indicated on the far right) with a second excitation wavelength and emission wavelength, and another centrally indicated first luminescent layer 7a or luminescent layer 7a of the first type is overlaid by the second luminescent layer 7b with a second excitation and emission wavelength (right).

[0103] The two luminescent layers 7a, 7b can generally lie next to each other essentially in one plane or at least partially stacked on top of each other. In this way, the secondary surface pattern can, on the one hand, require multiple excitation wavelengths for complete detection, but can also emit different wavelengths or colors, which appears particularly aesthetically and effectively and lends the security element 1 a higher verification quality.

[0104] The luminescent layers 7a, 7b are covered by a primer and / or protective layer 203 to prevent them from detaching from the metal layer. An HSL layer as an adhesive layer 204 (HSL: heat seal lacquer) is arranged over the primer and / or protective layer 203. The security element, in particular the layers 4b, 14, 7a, 7b, and 203, can be attached to a target substrate using the adhesive layer 204. The metal layer 14 can be understood as a layer that is opaque (impermeable) to the luminescence excitation light and emission light. However, the luminescent layers 7a, 7b, the HSL layer 204 and the primer and / or protective layer 203 are at least partially transparent to the luminescence excitation light and the emission light, so that a viewer from this side can recognize the achieved effect, namely the hidden secondary surface pattern 3 upon luminescence excitation.It is possible that the hidden secondary surface pattern 3 can also be visible from the opposite side upon luminescence excitation, particularly if the transfer carrier 300 has been removed. The release layer 202 can be transparent to the emitted light. It can remain at least partially or completely on the substrate after the transfer of the security element (detachment from the transfer carrier 300). Fig. 2b, for example, shows that a carrier layer can remain at least partially or completely on the substrate and / or be at least partially or completely transferred to the target substrate.

[0105] Position A2 indicates an alternative or additional position, namely between release layer 202 and embossing layer 4b, in particular embossing lacquer layer, at which the or one or more additional or alternative luminescent layers can be arranged.

[0106] Fig. 2b is a schematic representation of a layering 200b of a security element 1 as a stripe transferable to the target substrate (L-LEAD) according to one embodiment. Layering 200b differs primarily from that of Fig. 2a in that carrier layer 201 is part of security element 1. Optionally, a topmost ink-accepting layer 205 is also present.

[0107] Position B2 indicates a further alternative or additional position, namely between ink-accepting layer 205 and substrate 201, in particular PET layer, on which the or one or more additional or alternative luminescent layers can be arranged.

[0108] Fig. 3 is a schematic representation of a security element 1 as a patch on a transfer carrier 300 according to one embodiment. In particular, a plurality of patches (not shown) are present on the transfer carrier 300. In contrast to the layers 200a and 200b, the layering of the security element comprises several, here four, HSL sublayers 204. The HSL sublayers later jointly form an adhesive layer to the target substrate. Furthermore, the layering comprises an optional carrier layer 211 and several optional protective or primer layers 213.

[0109] In this and all other embodiments, the transfer carrier 300 can have two carrier layers 301 that are connected to one another via an adhesive layer 302. The transfer carrier 300 comprises the uppermost carrier layer 301, which serves as a support film, and a carrier layer 301 located directly beneath it, which is separated from the support film by a laminating adhesive layer serving as an adhesive layer 302. As is known, the layer structure of the security element on such a transfer carrier can be particularly well divided / separated into regions (for example, by punching or lasering the layer structure) without causing the transfer carrier 300 to tear. The three uppermost layers 301 and 302 can be peeled off or removed from the security element 1.

[0110] In the layering of the security element, the luminescent layers 7a, 7b of the two different types (i.e., the different excitation wavelengths) are arranged next to each other. The carrier layer 211 of the security element is arranged between the protective layer 203 and the lowermost HSL sublayer 204.

[0111] Fig. 4a is a schematic representation of a layering 400a of a security element 1 as a patch that is transferable to a target substrate, according to one embodiment. The layering 400a comprises, in the following order: an uppermost PET layer 201, a lacquer layer 401, a further PET layer 201, a further lacquer layer 401, a further PET layer 201, a primer layer 203, an embossing lacquer layer 4b, a perforated metal layer 14, the luminescent layers 7a, 7b of the two different types lying above and next to one another, a protective layer 203 and an HSL layer 204. Positions A4 and B4 indicate alternative or additional positions at which the or further or alternative luminescent layers can be arranged, namely A4: between the release layer 202 and the further lacquer layer 401, and B4: between the uppermost primer layer 203 and the embossing lacquer layer 4b.

[0112] Fig. 4b is a schematic representation of a layering 400b of a security element 1 as a T-patch on a transfer carrier 300 according to one embodiment. The layering 400b comprises, in the following order: an uppermost PET layer 301, a first release layer 402 and a second release layer 403, an embossing lacquer layer 4b, a perforated metal layer 14, the luminescent layers 7a, 7b of the two different types lying above and next to one another, a primer layer 203, and an HSL layer 204. Position C4 indicates an alternative or additional position at which further or alternative luminescent layers can be arranged, namely C4: between the second release layer 403 and the embossing lacquer layer 4b.

[0113] The described layers 200a, 200b, 400a, 400b are schematically equipped with the indicated UV-A active luminescent layers (also UV-A layers). More UV-active and in particular UV-A active layers, for example three, four, five, six, or more, can also be present in the layers. The UV layers can be arranged next to or on top of one another. The use of such layers in threads is also possible. However, this use is rather limited by the generally small surface area of ​​the threads. Threads are introduced into a paper substrate, preferably in a paper machine. All embodiments are, in principle, suitable for being introduced between partial layers of a target substrate. In such embodiments, for example, a second adhesive layer can be used, which is arranged on the other side of the security element, in order to achieve good adhesion of the security element to the target substrate.

[0114] The layers with the same reference numerals and / or designations of the described layers 200a, 200b, 400a, 400b or the previous figures may have similar or identical properties, such as transparency or partial transparency, therefore redundant information is not reproduced in detail for each embodiment.

[0115] Fig. 5 is a schematic representation of a method 100 for producing a security element 1 according to one embodiment. The left-aligned method steps 101, 102, 106, and 107 shown in Fig. 5 essentially correspond to the method 100 according to the invention. The indented method steps 103, 104, 105, and 108 shown in Fig. 5 correspond to preferred method steps.

[0116] The method 100 for producing the security element 1 according to one embodiment comprises: arranging 101 a metal layer 4 over a substrate and forming 102 a relief structure 4a to produce an optically variable primary surface pattern 2; perforating and / or demetallizing 106 the metal layer 4 in the form of a plurality of perforating elements 6 to produce a secondary surface pattern 3; and arranging 107 an at least partially transparent luminescent layer in the region of the secondary surface pattern 3.

[0117] In the method 100, the formation of the relief structure 4a can comprise the steps of: arranging 103 an embossed layer 4b on the substrate; embossing 104 the relief structure 4a into the embossed layer 4b; and applying 105 the metal layer 4 to the embossed layer 4b. In the method 100, the perforation and / or demetallization 106 of the metal layer 4 can further comprise at least one of the following method steps: a washing process, an etching process, laser ablation, metal pigment printing with recesses, a metal transfer process, punching, mechanical and / or electrochemical removal, and peeling.

[0118] The manufactured security element can be applied to or incorporated into a target substrate and comprise an adhesive layer. In this case, the formation of 108 adhesion islands can occur in the adhesive layer. For this purpose, the (UV) radiation-curable adhesive layer is irradiated (with UV light) through the perforating elements. Cured adhesion islands are formed in the adhesive layer. The adhesion islands provide better local adhesion between the security element and the target substrate than in the uncured surrounding area of ​​the adhesive layer. Non-destructive detachment of the security element from the target substrate can thus be prevented.

[0119] Method 100 may be performed in the order shown. However, method 100 need not be performed in this order.

[0120] Below, some general comments, examples and features for (further) embodiments are made or described:

[0121] In general, the wavelengths 365 nm and 254 nm are suitable for wavelength-dependent fluorescence in the detection of Type 2 security features.

[0122] In the optically variable microrelief (e.g. holograms, micromirrors, nanostructures, etc.) of the metal layer (reflector metal), the reflector metal (e.g. aluminum) can be removed in small areas to create perforating elements. This de-metallization can be created using suitable processes, such as washing processes, etching processes, laser ablation, metal pigment printing with recesses, metal transfer processes, etc. The perforating elements, which correspond to de-metallized areas, can preferably be raster dots and / or raster elements with a diameter of 10 - 500 pm (preferably 50 - 250 pm). The raster elements can be not only dots, but also, for example, small alphanumeric characters, symbols, ornaments, or lines. The raster elements can be arranged regularly or randomly. The totality of the raster dots can represent information or a motif.However, the dimension of these de-metallized raster elements should preferably not exceed a factor of 5 relative to the resolution of the human eye (100 pm).

[0123] When using high-resolution symbols, a suitable demetallization process can be used to achieve the desired resolution. The raster elements or cutouts (the so-called "negative text") are barely visible when viewed from above with reflective light, as these areas are outshone by the adjacent reflective areas. These areas of the foil security element with the demetallized raster are then backed with one or more luminescent and / or fluorescent colors (luminescent layer).

[0124] It is possible to additionally coat the demetallized areas with a semi-transparent layer with a transmission of >25%. The luminescent and / or fluorescent colors can be excited at one or more wavelengths (e.g., at 365 nm, 395 nm, 254 nm UV broadband). The demetallization image, i.e. the substructure consisting of the perforating elements, is visible to the naked eye only in transmitted light and under UV light. In the area of ​​the screened demetallization, the luminescent and / or fluorescent surface area is significantly lower than in the outer areas, which can be completely demetallized. This sometimes leads to the screen area being overexposed by the fluorescence of the outer area. However, this can be compensated for by clever color selection, such as lighter fluorescent colors on the inside and darker fluorescent colors on the outside.Compensation is also possible by varying the pigmentation or reducing the layer thickness. The same compensation principles can apply if no semitransparent metallization remains.

[0125] List of reference symbols

[0126] 1 Security element la Outer contour of a star (optically variable) Primary surface pattern a Motif (star) created by the optically variable primary surface pattern with 3D

[0127] effect

[0128] 3 (hidden) secondary surface pattern Opaque area a Relief structure b Embossed layer

[0129] 5 Perforation area

[0130] 5a Superior form (e.g. cross), which is formed by the perforating elements or their substructure

[0131] 6 (An element perforating the metal layer) or elements perforated into the metal layer

[0132] 6a A first (perforating) element

[0133] 6b A second (perforating) element

[0134] 6c A third (perforating) element

[0135] 7a First luminescence layer with a first excitation and / or emission wavelength

[0136] 7b Second luminescence layer with a second excitation and / or emission wavelength

[0137] 8 Opaque area

[0138] 9 Liability is a

[0139] 14 metal layer

[0140] 15 Substructure

[0141] 100 Methods for producing a security element

[0142] 101 Arranging a metal layer over a substrate

[0143] 102 Forming a relief structure to create an optically variable primary surface pattern

[0144] 103 Applying an embossed layer to the substrate

[0145] 104 Embossing the relief structure into the embossed layer

[0146] 105 Applying the metal layer to the embossed layer

[0147] 106 Perforating the metal layer in the form of a plurality of perforating elements to create a secondary surface pattern

[0148] 107 Arranging an at least partially transparent luminescent layer in the

[0149] REVISED SHEET (RULE 91) ISA / EP area of ​​the secondary surface pattern

[0150] 108 Formation of liability islands

[0151] 200a Layering of a security element as a transfer strip

[0152] 200b of a security element as a laminating strip

[0153] 201 Carrier layer

[0154] 202 Release layer and / or adhesion layer

[0155] 203 Primer or protective layer

[0156] 204 Adhesive layer

[0157] 205 Ink acceptance layer

[0158] 211 Carrier layer

[0159] 213 Protective layer

[0160] ,300 transfer carriers for security element

[0161] 301 Film layer, in particular PET carrier and / or support film

[0162] 302 Laminating adhesive

[0163] 400a Layering of a security element as a lamination patch

[0164] 400b Layering of a security element as a transfer patch

[0165] 401 lacquer layer

[0166] 402 Release Layer 1

[0167] 403 Release Layer 2

[0168] A Position in layering for alternative or additional luminescence layer

[0169] B Additional position in layering for alternative or additional luminescence layer

[0170] C Further position in layering for alternative or additional luminescence layer da First distance: Side distance between first and second perforating element db Second distance: Side distance between second and third perforating element r Radius of a circular element

[0171] REVISED SHEET (RULE 91) ISA / EP

Claims

Patent claims 1. A security element (1) for a value document, the security element (1) comprising: an optically variable primary surface pattern (2) comprising a metal layer (4) with a relief structure (4a); and at least one hidden secondary surface pattern (3) comprising a plurality of elements (6) perforating the metal layer (4) and at least one luminescent layer (7) arranged at least partially in the region of the plurality of elements (6) perforating the metal layer (4).

2. Security element (1) according to claim 1, wherein the luminescent layer (7) comprises a fluorescent layer and / or a phosphorescent layer, wherein the fluorescent layer is configured to fluoresce and the phosphorescent layer is configured to phosphoresce.

3. Security element (1) according to claim 1 or 2, wherein the optically variable primary surface pattern (2) comprises an embossed layer (4b) above and / or below which the metal layer (4) is arranged.

4. Security element (1) according to one of the preceding claims, further comprising a transparent region (8) surrounding the primary surface pattern.

5. Security element (1) according to one of the preceding claims, wherein the perforating elements (6) have at least one of the following shapes: geometric shapes, in particular triangular, rectangular, diamond-like, circular shapes, preferably annular or full-surface circular shapes, alphanumeric characters, symbols, ornaments, lines and grids.

6. Security element (1) according to one of the preceding claims, wherein the perforating elements (6) have a length and / or a width of 10-500 pm and preferably of 50-250 pm.

7. Security element (1) according to one of the preceding claims, wherein the perforating elements (6) have a lateral distance from one another which is 10-500 pm, preferably 50-250 pm.

8. Security element (1) according to one of the preceding claims, wherein the luminescent layer (7) is luminescent at discrete wavelengths or in a continuous spectral range in the UV range, in particular between 315 and 405 nm, more preferably between 350 and 400 nm.

9. Security element (1) according to one of the preceding claims, wherein at least in the region of the secondary surface pattern (3) at least one semi-transparent layer is arranged which has a transparency of at least 25%.

10. Security element (1) according to one of the preceding claims, wherein the security element further comprises a radiation-activatable adhesive layer (204), wherein an adhesion island (9) can be produced in the adhesive layer (204) preferably by irradiating the adhesive layer (204) through the element (6) perforating the metal layer (14).

11. Method (100) for producing a security element (1) comprising: Arranging (101) a metal layer (4) over a substrate and forming (102) a relief structure (4a) in order to produce an optically variable primary surface pattern (2); Perforating (106) the metal layer (4) in the form of a plurality of perforating elements (6) to produce a secondary surface pattern (3); and Arranging (107) an at least partially transparent luminescent layer (7) in the region of the plurality of perforating elements (6).

12. The method (100) according to claim 11, wherein the formation of the relief structure (4a) comprises: Arranging (103) an embossed layer (4b) on the substrate; Embossing (104) the relief structure (4a) into the embossed layer (4b); and Applying (105) the metal layer (4) to the embossed layer (4b).

13. The method (100) according to claim 11 or 12, wherein the perforating (106) of the metal layer (4) comprises at least one of the following methods: a washing method, an etching method, a laser ablation, a metal pigment printing with recesses, a metal transfer method, a punching, a mechanical and / or electrochemical removal, a peeling.

14. Method (100) according to one of claims 11 to 13, wherein, when the produced security element is applied or introduced onto a target substrate, adhesion islands (9) are formed (108), in particular by producing the adhesion islands by irradiating a radiation-curable adhesive layer (204) through the perforating elements (6).

15. The method according to claim 14, wherein the adhesive layer (204) comprises a UV-curing polymer and / or the adhesion islands (9) of the adhesive layer (204) provide locally better adhesion to the target substrate as detachment protection for the security element (1).

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