CN115366557A

CN115366557A - Value document and method for producing a value document

Info

Publication number: CN115366557A
Application number: CN202210534924.4A
Authority: CN
Inventors: M.拉姆; S.比切梅尔; H.洛希比勒; M.菲弗; T.萨特勒
Original assignee: Giesecke and Devrient GmbH
Current assignee: Giesecke and Devrient GmbH
Priority date: 2021-05-18
Filing date: 2022-05-17
Publication date: 2022-11-22
Also published as: DE102021002600A1; EP4091830A1

Abstract

The invention relates to a value document, such as a banknote, a cheque, a credit card or other payment card, a certificate card or the like, having a front side and a rear side. The value document shows a view that can be recognized by the naked eye in a top view from the front and has a specific size (L, B) in the top view. The document of value (1) has a substrate body (2) which has specific dimensions (L, B) in a plan view and is connected to a first transparent film (18) having an inner side and an outer side in such a way that the substrate body (2) rests against the inner side of the first transparent film (18) so that the substrate body (2) points to the rear side and the outer side of the first transparent film (18) points to the front side. The first transparent film (18) also has a specific dimension (L, B) in a plan view and a view that can be recognized from the front side is produced by a metallized first embossed structure (20) that is arranged on the inner side of the first transparent film (18). Furthermore, a first security element which can only be read by machine is arranged on the inner side of the first transparent film (18).

Description

Value document and method for producing a value document

Technical Field

The invention relates to a value document, such as a banknote, a check, a credit card or other payment card, a document card or the like, which has a front side and a rear side and shows a view that can be recognized by the naked eye in a top view from the front side. The document of value has a specific dimension in a plan view and has a substrate body which has the specific dimension in a plan view and is connected to a first transparent film having an inner side and an outer side in such a way that the substrate body lies against the inner side of the first transparent film, so that the substrate body is directed toward the rear side and the outer side of the first transparent film is directed toward the front side. The first transparent film also has the specific dimensions in a plan view and a view that is recognizable from the front side is produced by a metallized first embossed structure, which is arranged on the inner side of the first transparent film.

Background

Such a value document is known from DE 10 2014 018551 A1. In such a document of value, printing inks based on pigment inks (Pigmentfarbe) are completely avoided. The complete optical appearance, including all optical security features, is produced in a single embossing process and subsequent evaporation of the front or back side.

DE 10 2017 130588 A1 likewise describes such a document of value, which additionally has moir e features, in particular micro-concave mirrors.

DE 10 2019 004325 A1 describes a document of value in which the embossed structures and the print receptive layer or the colored printed image of the above-mentioned patent document are combined, which produce an optically variable effect.

In the future, value documents must meet high demands on security against forgery and at the same time ecological sustainability. Ecologically sustainable security elements are characterized by a low energy consumption and a low raw material consumption in their production. Rare and environmentally damaging raw materials are avoided and the used raw materials flow as completely as possible again into the manufacture of other value documents at the end of the product life cycle.

Disclosure of Invention

The invention aims to provide a value document which improves the security against forgery and ecological sustainability.

The object is achieved according to the invention by a value document and a method for producing a value document.

A value document is specified, for example a banknote, a check, a credit card or other payment card, a certificate card or the like, which has a specific size in a top view. The value document has a front side and a rear side and shows a view that can be recognized by the naked eye in a top view from the front side. The document of value furthermore has a substrate body which has the specified dimensions in plan view and is connected to a first transparent film having an inner side and an outer side in such a way that the substrate body lies against the inner side of the first transparent film, so that the substrate body points to the rear side and the outer side of the first transparent film points to the front side. The first transparent film also has the specific dimensions in a plan view and a view that is recognizable from the front side is produced by a metallized first embossed structure, which is arranged on the inner side of the first transparent film. The value document has a machine-readable only first security element arranged on the inner side of the first transparent film.

In a preferred embodiment, the document of value has a second transparent film, which likewise has the specified dimensions and has an inner side and an outer side. The second transparent film rests with its inner side against the base body, so that the outer side of the second transparent film points towards the rear side of the value document. The view that can be recognized from the rear side is produced by a metallized second embossed structure that is arranged on the inner side of the second transparent film. A machine-readable only second security element is disposed on the inside of the second transparent film.

"only" is machine-readable in this application means that the information of the first or second security element can only be read by a machine device. A security element that is only machine readable cannot be identified by the naked eye of an observer. "metallization" is understood to mean, according to the present application, a metallic coating, also a coating with a highly refractive material or a coating with a combination of metallic and dielectric layers, for example a color-shifting metal-dielectric-metal layer system.

The value document has a smooth front side and a smooth back side, since the outer side of the first transparent film and the outer side of the substrate body or the second transparent film are on the front side and the back side of the value document. The outer side of the first transparent film and the outer side of the substrate body or the second transparent film are preferably not printed with printing inks nor with conventional security elements. The embossed structures, which show optically recognizable views to the naked eye when the front side or the rear side is viewed in top view, are arranged on the inner side of the first or second transparent film and are therefore protected against chemical or physical pressure to which the front side or the rear side of the document of value is exposed. The same applies to the security element which is likewise arranged on the inner side of the first or second transparent film. Furthermore, by means of this (internal) arrangement of the embossing structure and the security element, they are well protected against manipulation-like access. Protection is also formed during further processing steps of the value document. This increases the service life in circulation compared to conventional value documents with externally located security elements. The security of the value document is also increased by the security element located inside, since the security element cannot be easily removed from the surface or manipulated.

A first or second security element and a metallized embossed structure showing a recognizable view are arranged on the inner side of the first or second transparent film. In this way, both the recognizable view from the front and the first security element can be produced in a single embossing step on the inner side of the first transparent film. The same applies to the recognizable view from the rear and to the second security element on the inner side of the second transparent film. The application and printing processes of conventional security elements can preferably be completely dispensed with, so that the number of process steps in the production of the value document is kept low. This saves resources and increases the throughput of the production machine, thereby reducing the energy consumption and thus improving the ecological sustainability of the value document.

The first security element can extend over the entire specific dimension of the document of value, so that a larger area of the document of value is provided with a first security element which can only be read by machine and which cannot be recognized by the naked eye of an observer. Thereby providing security against counterfeiting.

The elimination of the application of conventional security elements in the form of LEAD strips, threads, patches, etc. enables a uniform thickness of the value document, whereby the risk of jamming in the manufacturing machine is reduced. This increases the yield of the manufacturing machine and thus the ecological sustainability of the value document. Furthermore, the stacking quality of the value documents is improved by the elimination of conventional security elements.

Since the security element can only be read by machine and preferably extends over a large area of the value document, an increased security against forgery is achieved. This increased security against forgery of the value document relative to value documents with printed conventional security elements also increases its ecological sustainability.

The security-protected value document can be left on the market for a longer time and does not need to be replaced because of the increased forgery rate. Thereby improving the service life of the value document and thus the ecological sustainability.

In the production process of the document of value, it is preferred to use only substances which can be re-flowed as completely as possible into the subsequent production process by means of a recovery method. Furthermore, it is preferable to avoid high-value raw materials, such as rare earths or rare metals, and to avoid materials that are harmful to health. These three aspects also improve the ecological sustainability of the value document.

The conventional printing process can be completely omitted. The conventional printing process repeatedly causes a shift in the manufacturing process, for example, between the printed image and the substrate body. Such deviations have to be corrected by sophisticated algorithms on the processing machine to check the traditional value documents in circulation. Since the value document according to the invention does not have such an offset, the risk of rejects is lower when the value document is processed than in conventionally manufactured value documents, such as banknotes.

The substrate body and the first or second transparent film preferably consist of a polymer and can thus improve the protection of the embossed structures located inside and the security element as an element made of paper. However, the substrate body may also be composed of paper or other opaque or translucent material. The substrate body may regionally have a continuous opening that is physically covered by the first and possibly the second transparent film, but appears transparent or translucent to an observer. In this region, optically variable security features designed for use in transparent or translucent regions may be used.

In a preferred embodiment, in addition to the first and/or second security element which can only be machine-readable, further security elements are arranged on the inner side of the first or second transparent film and/or on the side of the substrate body which is directed towards the inner side of the first or second transparent film. These security elements can likewise be machine-readable only, but they can also display image information to the naked eye of the observer.

Since the first or second transparent film extends over the entire specific dimension of the substrate body, the security elements can be distributed over the entire substrate body, without they being limited to the respective carrier which was fixed to the substrate body in the previous solutions. This enables the value document to be suitable for measurements in longitudinal and transverse transport, for example on banknote processing machines. Longitudinal transport is understood by the person skilled in the art in this case to mean the transport of banknotes in a banknote processing machine, in which the shorter edge of the banknote runs in the direction of movementTowards the front. A transverse transport is understood by those skilled in the art as the transport of banknotes in a processing machine, wherein the longer edge of the banknote is at the front in the direction of movement. Furthermore, a relatively large area of the value document can be selectively hidden or revealed optically on one or both sides. Furthermore, since the first security element is not (as in the case of conventional security elements) limited to the dimensions of the respective carrier, a combination of machine-readable features and real-time authentication becomes possible

An example of this is the concealed placement of conductor tracks (Leiterbahn).

In a preferred embodiment, the first and/or the second security element influence the penetrating irradiation by terahertz radiation (THz radiation). Layers which influence terahertz radiation are known from the prior art, for example from WO 2020/126065.

In a further preferred embodiment, the first and/or second security element exhibits a resonant effect on electromagnetic terahertz radiation incident in a frequency range. Layers which influence terahertz radiation in this way are known from the prior art, for example from WO2006/027112 A1.

The security element which influences terahertz radiation is combined with the first or second imprinted structure and is replicated in a single process step by imprinting on the inner side of the first or second transparent film. The metallization of the first or second imprinted structure and of the first or second security element is also carried out in a single process step. Examples of layers that influence terahertz radiation are structures in two planes, which have thin slits and have a polarizing effect in the terahertz range.

The first security element (i.e. in embodiments the layer that influences terahertz radiation) is located between the first transparent film and the substrate body and is therefore anchored inherently in the document of value. The same applies to the second security element arranged between the substrate body and the second transparent film. The first or second security element cannot be removed by a counterfeiter. Furthermore, in an embodiment, the first or the second security element extends over a specific dimension of the document of value. This enables authenticity verification of the entire value document, but also of a part of the value document, by means of terahertz radiation.

In a preferred embodiment, the first and/or the second security element has a plurality of regions. These regions may have the same layers that affect terahertz radiation. However, the layers affecting the terahertz radiation can preferably also be different in different regions. The wire grid structure is particularly preferably region-specific, for example with respect to its period or its azimuth angle.

The authenticity verification of the layer influencing the terahertz radiation is realized by a sensor. The sensor consists of a terahertz source and a terahertz detector. Such sensors are located, for example, in the measuring section of a banknote processing machine during banknote manufacture. In this measuring section of the banknote processing machine, the terahertz source and the terahertz detector are preferably mounted opposite the banknote transport section. The terahertz detector measures a terahertz signal transmitted through the document of value (in this case a banknote) in at least one wavelength, preferably in two different wavelengths, particularly preferably in a plurality of different wavelengths.

A preferred variant of the document of value generates linearly polarized radiation in the region of the first or second security element, wherein the terahertz detector measures radiation rotated by 90 °. In this variant, only the radiation that has undergone a polarization rotation at the respective security element is measured. This is the case when the wire grid of the layer influencing the terahertz radiation is rotated by an azimuth angle of 90 ° with respect to the incident vector of the terahertz radiation. In this arrangement, the period of the wire grid may also be chosen such that the transmitted signals are different for two or more wavelengths. Since only the region with the layer influencing the terahertz radiation rotates the polarization and generates a signal at the detector, the signal-to-noise ratio is improved.

Furthermore, the layer influencing the terahertz radiation facilitates the determination of the thickness of the value document. This makes it possible to dispense with an ultrasonic-based thickness sensor and to determine the thickness of the document of value using a terahertz sensor.

In an embodiment, the regions of the first or second security element are provided individually for each denomination of currency or the wire grid structure of these regions is different. Thus, in the case of currency unit division of a banknote, the currency denomination can be identified by the terahertz sensor and verified accordingly. The properties of the first and second security elements which influence the transmission of terahertz radiation are particularly preferably adapted to one another.

It is also possible to use terahertz sensors to measure the structural color generated by the metallization sections of the first or second imprinted structures (terahertz structures). Unlike printing inks, the structural color is defined spectrally precisely and is hardly affected by batch fluctuations in manufacturing. They also do not change their reflection or transmission spectra over time, since the imprinted structures are completely embedded in the dielectric and shielded from environmental influences. The additional evaluation of the reflection or transmission of the structural color in the ultraviolet or infrared range compensates for the reduction in the security level caused by the elimination of the fluorescent or phosphorescent and magnetic features when the printing ink is dispensed with.

In one embodiment, a translucent, metallic grid and/or bragg interference structure, which is also described below, is integrated into the first and/or second security element.

In a preferred embodiment, the value document is additionally printed. The first transparent film and the print receptive layer and the printing ink are both transparent to terahertz radiation, so that a layer that affects through-irradiation by terahertz radiation, which is located between the first transparent film and the substrate main body or between the second transparent film and the substrate main body, can be well hidden visually.

In other preferred embodiments, the first and/or second security element has a position-and/or orientation-dependent conductivity.

The direction-dependent conductivity (anisotropic conductivity) is realized, for example, by a thin wire. Such a line is conductive in one direction but non-conductive in the other direction. For example, in a plan view of the document of value, the electrical conductivity can be established from left to right, but not from top to bottom. This encoding according to the conductivity can be decoded by a machine for resistance measurement. Different elements (e.g. power supply, sensor) and output elements can also be used via the protected conductor tracks. The position-dependent conductivity is present when regions of the first and/or second security element are able to conduct and other regions are not.

In a preferred embodiment, the first and/or the second security element has an NFC element. The security element on the front side or the rear side of the document of value may contain, for example, elements for Near Field Communication (NFC), for example elements that can be activated by a smartphone (for example, OLEDs). Furthermore, the security element may contain elements for identification by means of electromagnetic waves (RFID) in sections. Solar modules for energy production, LEDs, displays for displaying authenticity or elements for storing electrical energy are also possible. Since the first or second security element is located between the first or second transparent film and the substrate body, the mentioned element is also well protected from external influences. These elements can also be well concealed by the printing ink preferably applied on the outside of the first or second transparent film.

In a further preferred embodiment, the first and/or second security element can have a lattice structure, which serves as an optical filter. Such a grid structure has grids in a plurality of regions, which are oriented azimuthally differently. The grid structure can be analyzed by machine (e.g., spectrally in T-DID) and shows interactions in transmission and interactions in diffuse reflection.

More preferably, the first and/or second security element has a waveguide with an input-coupling region and an output-coupling region. The section of the first and/or second security element having the waveguide therein preferably has a sandwich structure, in particular a three-layer structure having a thick high-refractive-index film as a light conductor layer, which is surrounded by two thin low-refractive-index films. The film used as a waveguide may be printed with LRI lacquer, for example. The coupling-in and coupling-out regions are then produced, for example, by leaving empty spaces in the LRI varnish. It is also possible to combine or use metallized embossed structures with windows in the value document. Compared to value documents made of paper, the waveguide film advantageously has no inherent roughness of paper.

In a further preferred embodiment, the first and/or second security element has a magnetic coding with magnetic coding elements. What is possible is a magnetic coding with printed Bits based on pigments of high and low coercivity and with combined Bits which may contain both types of pigments either mixed or superimposed in layers. Magnetic encoding is achieved by the size and order of the bits.

The first and/or second security element particularly preferably has a magnetic coding in the longitudinal direction of the security element, which comprises different types of magnetic coding elements. There is no magnetic material between the individual encoding elements. Such a magnetic encoding is known from WO 2014/161674. In one embodiment, the coding elements each have a grid-like magnetic region, wherein the direction of the grid strips of different coding elements can be different. Furthermore, the magnetic coding elements can be designed such that they have conventional magnetic regions which do not comprise grid bars but in which a magnetic material is applied continuously in a planar manner.

Particularly preferably, the first and/or second security element has an electrical conductivity which is dependent on an externally applied magnetic field.

For machine-readable security elements, the magneto-resistive effect can also be used, in which the electrical conductivity depends on the magnetization of one or more layers (magneto-resistance rate). For this purpose, the first security element preferably has a magnetic layer system consisting of one or more magnetic layers and possibly nonmagnetic layers. The magnetization of the layer system and the measured resistance associated therewith can be changed by applying an external magnetic field.

In the case of the anisotropic magnetoresistance effect (AMR), which is preferably used as the magnetoresistance effect, the conductivity depends on the direction of current flow with respect to the magnetization direction of the magnetic layer. The resistance is greatest when the magnetization is oriented parallel to the current flow, and the resistance is least when the magnetization extends perpendicular to the current flow direction. For example, permalloy, which is an alloy composed of 81% nickel and 19% iron, may be used as the magnetic layer. The encoding of the machine-readable security element with the magnetoresistive effect is carried out by means of a linear grid which is evaporated with a magnetic material and has an orientation angle which can be adjusted at will.

For example, two magnetic layers with different coercive field strengths can also be used as a magnetic layer system, which are separated from one another by a thin nonmagnetic intermediate layer. The GMR effect occurs on such layer systems: giant Magnetoresistance (Giant Magnetoresistance). The electrical resistance of the layer system is low when the two magnetic layers are magnetized parallel to one another, and is high when the magnetization directions in the two layers are opposite. Iron, cobalt or nickel or alloys containing these metals are preferably used as the magnetic metal. It is particularly preferred to use an iron-silicon alloy or other iron-containing alloys. For example, cr may be used as the nonmagnetic intermediate layer.

In a particularly preferred embodiment, the document of value has a first transparent film only on that side of the substrate body which is directed toward the front side of the document of value, which first transparent film is provided with the first embossing structure. The second transparent film is not applied to the substrate body and is therefore located on the back of the value document. The first stamped structure is metallized and is also visible when viewed from the back of the value document. This is not the case when applying printing inks that require an opaque ink receiving layer. When they are applied on the front side of the value document, they are not perceptible, or are only less perceptible, when the value document is viewed from the rear side.

The first stamped structure particularly preferably has a vertically asymmetrical contour in sections and a vertically symmetrical contour in sections. The vertically asymmetrical profile is a two-dimensional periodic color filter grid, as described in DE 10 2011 101 635 A1. Such a grid produces different color saturation of the front and back surfaces in reflection. Mirror-inverted views can thus be produced on the front side and the rear side with different color saturation.

The embossed structure with a vertically symmetrical profile shows the same appearance, both from the front and from the back. A linear grid, i.e. a one-dimensional periodic sub-wavelength grid, is usually used as a vertically symmetric profile.

The value document according to the invention uses a combination of a two-dimensional periodic grid and a one-dimensional periodic sub-wavelength grid in order to be able to visualize an asymmetric symbol or pattern on the back side in a front view (seitenrichtig). This will be further elucidated in the further course of the present application according to an embodiment.

By means of the metallized embossed structure on the inner side of the first transparent film, a color effect is produced in transmission which can be perceived when viewed from the back of the value document. Thus, for example, transmissive features can be formed without having to design windows in the substrate body. Furthermore, the transmission features may extend over the entire value document in that the first embossed structure is arranged on the inner side of the first transparent film and the first transparent film extends over said specific dimension of the value document. This considerably simplifies the authenticity check of the value document, since it is difficult to carry out an authenticity check in conventional windows.

Since in the present exemplary embodiment only one side of the document of value is structured (no transparent film is provided on the other side), the resource consumption of the UV lacquer for embedding the embossed structures is halved, and the energy consumption and the aluminum consumption during the evaporation process are reduced (only one transparent film has to be processed). Furthermore, the thickness and weight of the value document are reduced compared to conventional value documents with films applied on both sides, since only one transparent film is applied to the substrate body. The risk of wrinkling is reduced by the two-layer composite structure consisting of the substrate body and the first transparent film, relative to a three-layer composite structure consisting of the substrate body and the two films. The risk of membrane delamination is also reduced. The stacking capability of the value documents is also improved by the smaller thickness. Furthermore, in the value document of the present embodiment, the security against forgery is increased, since it is not possible to separate the appearances on the front side and the rear side and the embossed structure can extend over the entire specific dimension of the value document.

In a method for producing a value document according to the invention having a substrate body and a first transparent film arranged on a side of the substrate body which is directed towards the front side, the method comprises the following steps:

first a prototype (Original) is provided, which has the specific dimensions of the value document and on which a first imprint structure is applied, resulting in a stamper. Here, the first imprint structure present in the photopolymer is "replicated" by electroplating in nickel or by molding in a photopolymer, thereby forming a stamper on the prototype.

An impression cylinder is then made from this stamp on the prototype. For this purpose, a prototype with a stamper located thereon is reproduced on the surface of the impression cylinder. This is again achieved by forming in nickel. The structured nickel shim was then pulled tight against the impression cylinder.

In a next step, the first imprinted structure is transferred from the imprinting cylinder onto the first transparent film. This is done in a continuous process (e.g. roll-to-roll) by Embossing (UV nanoimprinting) or Hot Embossing (Hot-Embossing) in a UV lacquer.

The first imprinted structure is then covered with a thin metal layer, preferably made of aluminum, copper, chromium, iron, nickel, silver or alloys thereof, or is coated with a material such as ZnS, tiO ₂ 、SiO _x Is coated with a high refractive index coating. It is also possible to use bimetallic evaporation for the coating, in order to produce or intensify different colors on the front and back of the document of value. Super silver coatings or thin film metallization combinations, such as color shift (Colorshift), are also possible. The coating process is carried out, for example, by high-vacuum evaporation, for example thermal, electron-beam evaporation or sputtering.

Finally, a metallized first imprint structure located on the first transparent film is connected to the substrate body. This is done, for example, by lamination (Kaschieren) or lamination and with the first embossed structure inside, i.e. between the first transparent film and the substrate body.

The first stamped structure is metalized in sections. Preferably, demetallized regions, in particular windows, can be provided in the metallization print. These areas can be printed, for example, with washable ink (waskfarbe) before being coated (metallized) with metal or high refractive index material. After the metallization, the metallization together with the washable ink is removed in the washing process in said areas. Alternatively, the demetallized regions can also be produced by irradiation with a laser beam after metallization or by a wet or dry etching process.

In the manufacturing method, the first embossed structure is preferably embossed in a UV lacquer. In order to reduce the consumption of the film in the production, the structured and subsequently metallized UV lacquer can be transferred onto the substrate body in a transfer process. The film used for the transfer method can be reused later.

There is currently no known method of recycling UV lacquer for embossing. By using a hot-pressing method to introduce the first embossed structure onto the first transparent film, the consumption of UV lacquer is significantly reduced and the film can be recycled.

In a preferred embodiment, the serial number of the value document can also be applied to the metallized first imprinted structure by laser irradiation. In this case, either the metallization is completely removed or the metallization is modified with laser pulses in such a way that the metallization contrasts in color or reflection intensity.

The manufacturing method already described does not change substantially if a second transparent film is provided. After the impression cylinder is manufactured, the first and second impression structures are transferred from the impression cylinder onto the first and second transparent films. This is done in a continuous process (e.g. roll-to-roll) by Embossing (UV nanoimprinting) or Hot Embossing (Hot-Embossing) in a UV lacquer. The embossed structure is then coated as already described, and the coating is removed again, if necessary, in sections.

The first and second transparent films are preferably joined to the substrate body in a single working step by lamination or lamination, so that the substrate body is located between the two transparent films.

In other preferred embodiments, the substrate body is transparent. The use of a transparent substrate contributes to the security of the value document against forgery. In the design, the structural color produced by the metallization impressions applied on both sides is selected such that, when the front and rear sides are viewed in plan, the regions complement one another in color. Furthermore, regions of the first embossed structure can be coated with a metallic or high-refractive-index coating, while the opposite regions of the second embossed structure are not coated, so that the color effect produced by the metallized first embossed structure is visible in the demetallized regions of the second embossed structure when the rear side of the value document is viewed in plan. In this design of the value document, it is virtually impossible to forge the value document by separating the front side and the rear side, so that the security against forgery is increased.

One or more design features, such as demetallized, multi-tone watermarks, a two-sided differential masking of fluorescence, phosphorescence or infrared light present inside, and structures for optically detecting authenticity, can preferably be applied to the document of value, but also hidden structures which can only be measured by special illumination/sensors (for example hidden micromirror arrays (mikrospiegelandorndnung), which are interlaced with visible micromirror arrays and therefore cannot be detected by the eye).

An anti-copy protection structure, for example an ohmic dragon ring, a guilloche (Guillochen) or an anti-copy structure consisting of a metalized embossed structure, can also be applied on the inner side of the first and/or second transparent film and/or on the substrate body itself.

In a preferred embodiment, both the front side of the value document, i.e. the outer side of the first transparent film, and the inner side of the first transparent film, or the substrate body itself, can be printed. If a second transparent film is provided, it can likewise be printed on both sides. All common printing processes are possible, in particular magnetic printing, neoMag, IR, sicpaTalk, fluorescence, UVABC, phosphorescence, but also the stamping of feature substances such as M, NAOS, elu, jewel or the stamping of conventional security features, for example in the form of threads or patches (Aufdruck). Conventional security elements may be, for example, holograms, micromirrors, sub-wavelength grids, moth-eye structures, CS, CC, combinations with fluorescent, luminescent, phosphorescent or IR materials. If the document of value is a banknote, standard banknote printing by engraving of steel plates as well as screen printing are of course also possible.

The invention also relates to a method for producing a value document, such as a banknote, a check, a credit card or other payment card, a certificate card or the like, having a front side and a rear side, having a specific size in plan view and showing a visual representation that can be recognized by the naked eye in plan view from the front side. The substrate body having the specific dimensions in plan view is connected to the first transparent film, which likewise has the specific dimensions in plan view and has an inner side and an outer side, in such a way that the substrate body rests against the inner side of the first transparent film, so that the substrate body points to the rear side and the outer side of the first transparent film points to the front side. The view that can be recognized from the front side is produced by a metallized first embossed structure that is arranged on the inner side of the first transparent film, and a first security element that can only be read by machine is arranged on the inner side of the first transparent film.

It is particularly preferred that the second transparent film, which likewise has the specified dimensions and has an inner side and an outer side, is applied with its inner side against the substrate body, so that the outer side of the second transparent film is directed towards the rear side of the value document. In this case, a second embossed structure is arranged on the inner side of the second transparent film, by means of which second embossed structure a view that is recognizable from the rear side is produced, and a second security element that is only machine-readable is arranged on the inner side of the second transparent film.

Drawings

The invention is explained in more detail below on the basis of embodiments with reference to the attached drawings, which also disclose essential features of the invention. These examples are for illustration only and should not be construed as limiting. For example, a description of an embodiment with multiple elements or components should not be construed as requiring that all such elements or components be present for implementation. Rather, other embodiments may contain alternative, fewer, or additional elements or components. Elements or components of different embodiments may be combined with each other as long as not otherwise specified. The modifications and variations described for one of the embodiments can also be applied to the other embodiments. To avoid repetition, identical or corresponding elements in different figures are denoted by the same reference numerals and are not explained again. In the drawings:

figure 1 shows a value document in a top view of an alignment face;

figure 2 shows a value document in a sectional view;

fig. 3 shows a banknote in a top view from the alignment side, with regions showing interactions in the terahertz range;

fig. 4 shows a banknote in cross section, with regions showing interactions in the terahertz range;

fig. 5A shows a security element in a top view, which has regions that show interactions in the terahertz range;

5B-5E show, in top view, regions showing interaction in the terahertz range;

6A-6D illustrate, in top view, regions having authenticity features;

6E-6F show images of regions having authenticity features in top view;

figure 7 shows an authentication system on a banknote processing machine;

FIG. 8A shows a schematic diagram showing wavelength dependent reflection of an imprinted structure;

FIG. 8B shows a schematic diagram showing wavelength dependent transmission of an imprinted structure;

FIG. 9A shows a translucent metal grid in transmission;

FIG. 9B shows a Bragg interference structure in reflection;

10A-10B illustrate, in top view, regions having line structures that are capable of conducting electricity;

11A-11B illustrate NFC elements;

12A-12B illustrate in cross-sectional views transmissive sub-wavelength grids;

13A-13D illustrate DID window elements in cross-sectional views;

FIGS. 14A-14C illustrate waveguide structures;

FIG. 15A shows a magnetic encoding in cross-section;

FIG. 15B shows a magnetic code in top view;

FIG. 15C shows in cross-section an imprint structure that is partially evaporated with a magnetic material;

FIGS. 16A-16D illustrate a demetallized mesh design;

FIG. 17 shows an ohmic dragon ring;

18A-18C illustrate a demetallized anti-copy structure;

figure 19 shows in top view to the front a banknote with regions having a vertically asymmetric configuration;

FIG. 20 shows in cross-section a banknote having fields with a vertically asymmetrical configuration;

figure 21A shows a banknote having a plurality of faces in a top view on the front (left) and a top view on the back (right);

figure 21B shows a banknote with multiple regions in a top view on the front (left) and a top view on the back (right).

In the drawings, like elements are provided with like reference numerals, respectively.

Detailed Description

Fig. 1 shows a value document 1 with a base body 2 in a top view of the registration face. The value document 1 and thus the base body 2 have a length L and a width B, wherein, according to the application, specific dimensions L, B are referred to. The first, second and third optically

variable elements

4, 6, 8 are arranged on the value document. Furthermore, a serial number 10, a number 12 and a first 14 and a second 16 image element are located on the value document 1.

Fig. 2 shows the value document 1 in a sectional view. The first transparent film 18 is arranged on the substrate body 2 such that the outer side of the first transparent film is directed towards the front side. A first embossed structure 20 is arranged on the inner side of the first transparent film 18 facing the substrate body 2. The first imprint structure 20 has a metallization 22. A detet region 24 is designed between the first transparent film 18 and the substrate body 2. The internal printed image 23 is located on the substrate body 2. An outer printed image 25 is arranged on the back of the substrate body 2 and on the outer side of the first transparent film 18.

Furthermore, a first security element is arranged on the inner side of the first transparent film 18. The first security element is not explicitly shown in fig. 2, since it cannot be distinguished schematically from the first imprint structure 20. The first embossed structure 20 is applied together with the first security element in a single operation, preferably by embossing, to the inner side of the first transparent film 18. The first imprint structures 20 and the first security element are protected from the chemical and physical stresses to which the front side and the rear side of the document of value 1 are exposed by this internal arrangement. Furthermore, an enhanced protection against manipulation-type access and a longer service life are achieved compared to value documents with conventional printed security elements.

The substrate body 2 and the first transparent film 18 consist of a polymer and thus can improve the protection of the first imprint structure 20 located inside and of the first security element as a substrate made of paper.

The first embossed structure 20 is applied on the inner side of the first transparent film 18 and is coated with a metallization 24. The metallized embossed structures produce color effects by forming structural colors. Even picture

elements

14, 16 may be produced. In this way, printing ink can be completely omitted in embodiments. In the embodiment of fig. 2, the outer printed image 25 is still applied to the outside of the first transparent film 18 and to the substrate body on the side directed toward the rear side of the document of value 1. This outer printed image 25 serves to conceal the first security element from an external observer.

Additionally, the first security element is only machine-readable, so that it is not or hardly recognizable to an external observer with the naked eye. It can only be read by machine means. This increases the security against forgery of the value document 1.

The first transparent film 18 also has said specific dimensions L, B, so that the first transparent film is located on the entire surface on the substrate body 2. The first embossed structure 20 is arranged on the inner side of the first transparent film 18, so that the first embossed structure may also extend over the entire specific dimension L, B. By means of the metallization 22 of the first imprint structure 20, it is possible to produce a color effect over the entire specific dimension L, B of the document of value 1 only by means of the first imprint structure 20 coated with the metallization 22.

The first security element is also arranged on the inner side of the first transparent film 18 and can therefore extend over the entire specific dimension L, B of the document of value 1, so that a larger area of the document of value 1 is provided with a security element which can only be read by machine. The first security element is not limited to the respective support and its dimensions as in conventional printed security elements. Since the only machine-readable security element is initially imperceptible to an external observer, the actual security protection is significantly higher than it would have been originally exhibited by the security element when the front side was observed with the naked eye.

In addition to the first security element which is only machine-readable, further security elements (likewise not shown) may also be arranged between the substrate body 2 and the first transparent film 18. The further security elements are also machine-readable security elements here. However, conventional security elements in the form of patches or strips can also be applied. The security element can be applied both on the substrate body 2 and on the inner side of the first transparent film 18.

The serial number 10 and the number 12 are produced, for example, by laser irradiation of the metallization 22 on the first imprint structure 20. In this case, either the metallization 22 is completely removed in the irradiated regions or the metallization 22 is modified with ultrashort laser pulses in such a way that the metallization 22 contrasts in color or reflection intensity.

Fig. 3 shows a value document 1 in a further embodiment as a banknote in a plan view from the front. The value document 1 has a substrate body 2, on which substrate body 2a first transparent film 18 is applied (indicated by shading). A second transparent film 21 is applied on the back surface of the base body 2. The substrate body 2 has specific dimensions L, B, as the first and second

transparent films

18, 21.

A banknote printing 26 and a security strip 28 are arranged in regions on the value document 1. The value document 1 also has a third optically variable element 30 and a fourth optically variable element 32 and a serial number 10. A first terahertz feature 34, a second terahertz feature 36, a third terahertz feature 38, a fourth terahertz feature 40, a fifth terahertz feature 42 and a sixth terahertz feature 44 are provided regionally.

Fig. 4 shows the value document 1 according to fig. 3 in a sectional view. The base body 2 is connected to the first transparent film 18 and the second transparent film 21 by an aluminum deposition section 43. The first embossed structures 20 and the first slit structures 47 are arranged on the inner side of the first transparent film 18. The second embossed structures 45 and the second slit structures 49 are arranged on the inner side of the second transparent film 21. In the sectional view, a plurality of first regions 41 can be seen, as well as a second region 46, a third region 48 and a fourth region 50. The terahertz features 34 to 44 are designed in regions 46 to 50, the first region 41 not influencing the penetrating irradiation by the terahertz radiation.

The overall appearance of the value document 1 according to fig. 3 and 4 is produced solely by the interaction of the imprinted

structures

20, 45 with the first and second security elements (in this case the terahertz features 34 to 44). Neither inside nor outside the printed image is applied. Furthermore, there is no conventional carrier-based security element on the substrate body 2, on the first transparent film 18 or on the second transparent film 21.

In this embodiment, therefore, without the use of printing ink, only the structural color produces a recognizable view which can be perceived with the naked eye when viewing the front side of the value document 1. These structural colors result from a first embossed structure 20 coated with a metallization 22, which is anchored inherently in the value document 1 (which is located on the inner side of the first transparent film 18) and is therefore well protected against external influences. Such a structural colour enables an analysis of the reflection or transmission in the ultraviolet or infrared range and thus enables the introduction of additional security features in comparison with printing inks in order to increase the security of the value document 1 against forgery.

The

embossed structures

20, 45 and the security element (in this case the slit structures 47, 49) are applied in a single process step by embossing onto the inner side of the first or second

transparent film

18, 21. The

imprint structures

20, 45 and possibly the metallization 22 of the security element are likewise carried out in a single process step. In the present embodiment, a structure with a slit in two planes is provided. Other regions that influence the illumination by the penetration of terahertz radiation are also feasible. The measurement of the penetrating irradiation by terahertz radiation is explained in more detail below with reference to fig. 7.

The design of the value document according to fig. 3 and 4 ensures that the security element which is inherently anchored in the value document 1 is not removed by counterfeiters as is the case with conventional carrier-based security elements which are located on the surface of the value document 1. Furthermore, the embossed structure may extend over the entire specific dimension L, B of the value document 1. The same applies to the first or second security element. This enables the authenticity of the entire value document 1 to be verified, but also the authenticity of parts to be verified by terahertz radiation.

As shown in fig. 3, the value document 1 has a plurality of regions with different terahertz features 34 to 44. The terahertz features 34 to 44 are different in shape. However, if they are designed as a wire grid, they may also differ, for example, in their period or their azimuth angle. A plurality of regions with the same terahertz features 34 to 44 can also be applied on the value document 1.

In the design of the document of value 1, it has to be noted that, when applying the terahertz features 34 to 44 to the front side of the document of value 1, the rear side of the document of value 1 also has to exhibit a transmission upon penetrating irradiation with terahertz radiation, in order to be able to measure said transmission thereby. This can be seen in fig. 4. Like the third region 48 and the fourth region 50, the second region 46 has transmission during irradiation of terahertz radiation, but not in the first region 44. Terahertz waves do not show any transmission in the enclosed metal film, but are instead transmissive to a dielectric such as paper or film. Wire grids are particularly preferred because they have a polarizing effect on transmission. This will be explained in more detail with reference to fig. 7.

The second region 46 has a second slit structure 49 on the inner side of the second transparent film 21. The inner side of the first transparent film 18 opposite this region is demetallised so that terahertz interactions can be measured in transmission. In the fourth region 50, the opposite is true. The first slit structure 47 is arranged on the inner side of the first transparent film 18, while the inner side of the second transparent film 21 opposite this region is demetallized. The first and

second slit structures

47, 49 can also be arranged opposite one another, as is the case in the third region 48, so that terahertz interactions in transmission can also be measured.

In fig. 5A, a pattern 52 in the form of a parrot is shown. This pattern is an example of a first or second security element arranged on the value document 1. Superimposed on this pattern 52 are structures which exhibit interactions in transmission in the terahertz range and which cannot be recognized in the visible range (i.e. can only be read by machine). Like the second terahertz structure 56, the first terahertz structure 54 exhibits a polarizing effect, wherein the first terahertz structure 54 is arranged to rotate relative to the second terahertz structure 56. Furthermore, a third terahertz structure 58 is provided. The schematic diagram 59 shows the transmission effect of the structures 54 to 58.

The terahertz structures 54 to 58 show interactions in the terahertz range and are filled with grids whose period is in the order of the terahertz wavelength range (50 μm) and is preferably shorter than the wavelength of the terahertz sensor used for measurements in transmission. These grids are transmissive in TM polarization, while transmission of TE polarized waves is blocked. TE polarization means that the E-vector of the incident electromagnetic radiation is parallel to the grid lines or slits. The TM polarization of the incident radiation defines the orientation of the E vector perpendicular to the grid lines.

Fig. 5B to 5E show examples of wire grids 60 which may be present in the region with the terahertz structures 54 to 58. Fig. 5B shows a linear grid that can be rotated by an azimuthal arrangement. Fig. 5C shows a circular grid. Fig. 5D shows a radial grid and fig. 5E shows a combination of a circular grid and a linear grid oriented in a different way in azimuth. Of course, the period of the wire grid 60 may be the same or additionally different in all embodiments.

Fig. 6A to 6D show further examples of terahertz structures 54 to 58 as described in detail in WO2006/027112 A1.

Fig. 6E and 6F show images in top views of such structures, namely terahertz structures 54 to 58.

Figure 7 shows a schematic diagram of an authentication system on a banknote processing machine. The value document 1 (in the form of a banknote) according to fig. 3 is guided through the banknote processing machine in a transport section in a banknote transport direction 61. The terahertz source 62 and the terahertz detector 64 are oppositely arranged in alignment with the transport section.

Authenticity verification by the terahertz features 34 to 44 is achieved by the terahertz sensor. This terahertz sensor is composed of a terahertz source 62 and a terahertz detector 64. The terahertz source irradiates the document of value 1 and thus the terahertz features 34 to 44 with radiation in the terahertz wavelength range. The terahertz detector 64 then measures the terahertz signal transmitted through the document of value, in particular in the region of the terahertz features 34 to 44, in at least one wavelength, preferably in two different wavelengths, particularly preferably in a plurality of different wavelengths.

If a wire grid is provided in the regions of the terahertz features 34 to 44, linearly polarized radiation is generated in these regions. Here, the terahertz detector 64 measures only radiation that is rotated by 90 °, i.e., radiation that has undergone polarization rotation at the terahertz features 34 to 44. This polarization rotation occurs at the terahertz features when the linear grid of terahertz features 34 to 44 is rotated by an azimuth angle of 90 ° with respect to the incident vector of the terahertz radiation. Since only the wire grid arranged rotationally in the regions of the terahertz features 34 to 44 causes a polarization rotation, a signal is generated at the terahertz detector 64 only in these regions, thereby improving the signal-to-noise ratio. Different transmitted terahertz signals can also be generated for multiple wavelengths if the period of the wire grid is selected differently from one terahertz feature 34-44 to another terahertz feature 34-44.

The described terahertz sensor can also be used for determining the thickness of the value document 1, so that an ultrasonic-based thickness sensor can be dispensed with.

Fig. 8A shows a first graphical view 66 of the spectral reflectance (0, 0 to 0, 3) of different two-dimensional periodic nanostructures 68 to 76, which are evaporated with a 40nm thick aluminum coating, in a first coordinate direction Y1 as a function of wavelength (350 nm to 850 nm) in a second coordinate direction X at normal incidence of radiation. Fig. 8B shows a second graphical view 78 of spectral transmission in the first coordinate direction Y2 as a function of wavelength in the second coordinate direction X at normal incidence of radiation. The first nanostructure 68 has a period of 280nm, the second nanostructure 70 has a period of 300nm, the third nanostructure 72 has a period of 340nm, the fourth nanostructure 74 has a period of 380nm and the fifth nanostructure 76 has a period of 420 nm.

The curves for all two-dimensional periodic nanostructures 68 to 76 show very characteristic resonance peaks in both transmission and reflection in the visible range and in the infrared and ultraviolet range. These distinct formants can be used for authenticity verification. For this purpose, known spectrometric sensors are suitable for use in processing machines.

Fig. 9A shows a security element in the form of a metallic translucent grid 80 having a first section 82, a second section 84 and a third section 86. Upon illumination with light source 88, a first optical effect 90 is produced in first section 82, a second optical effect 92 is produced in second section 84 and a third optical effect 94 is produced around third section 86 and directed into an observer's eye 96.

Fig. 9B shows a security element in the form of an embossed bragg interference structure 98, which reflects radiation incident at an angle 102 from a first direction 100 into a second direction 102.

A metallic translucent grid 80 according to fig. 9A and a bragg interference structure 98 according to fig. 9B are known. They are aluminium-based stamped structures which have a lower aspect ratio than known nanostructures and can therefore be mass produced more easily with a smaller reject rate. The metallic translucent grid 80 is suitable as an attractive colored transmission feature, for example in a banknote window, and the bragg interference structure 98 can create a color effect in reflection. Furthermore, the bragg interference structures 98 may be superimposed with fresnel structures so that the viewer perceives spatial effects and also motion effects.

Both types of structures (fig. 9A and 9B) can be used as security elements according to the present application. They can therefore be applied in a single embossing step to the first transparent film 18 in the same process step as the first embossed structures 20 or to the second transparent film 21 in the same process step as the second embossed structures 45.

Furthermore, the metallic translucent grid 80 or the bragg interference structure 98 has only a simple aluminum coating, so that the coating or metallization 22 of the imprinted

structures

20, 45 can also be carried out in a single process step.

The combination of the metallic translucent grid 80 and the bragg interference structure 98 also achieves an improvement of the appearance of the value document 1. The plasmonic structure color tends to appear dark due to light absorption, while the metal imprinted bragg interference structure 98 appears relatively bright because such structure absorbs little light.

Fig. 10A shows a metal line structure 105 with a horizontal continuous metal line. Fig. 10B shows metal line structure 105 with vertical non-continuous metal lines.

With the metal line structure 105 according to fig. 10A and 10B, a security element with a position-and/or orientation-dependent conductivity can be produced. Such a metal line structure 105 is also preferably applied in a single process step together with the first embossed structure 20 on the inner side of the first transparent film 18 or together with the second embossed structure 45 on the inner side of the second transparent film 21.

The continuous horizontal metal line of fig. 10A has conductivity in the horizontal direction, but does not have conductivity in the vertical direction. The decoding of the metal line structure 105 may be achieved, for example, by resistance measurement. The metal line structure 105 according to fig. 10B has a discontinuity in the vertically extending metal line and is therefore neither horizontally nor vertically conductive.

Fig. 11A shows the NFC element 106, i.e. an element for near field communication, the same as fig. 11B. Such an element can also be applied as a security element on the

transparent films

18, 21 together with the

embossed structures

20, 45. May also be applied to the substrate body. In any case, the NFC element 106 is inherently protected in the value document 1.

Fig. 12A shows a transmissive subwavelength grating 107, which can likewise be used as a first or second security element according to the present application. The transmissive sub-wavelength grid 107 has slanted nano-platelets 108, which nano-platelets 108 are covered over their entire surface with a coating 110. Fig. 12B likewise shows a transmissive subwavelength grating 107, as already shown in fig. 12A. However, the transmissive sub-wavelength grid 107 according to fig. 12B is only partially covered by the coating 110. Such a structure is known from EP3334611B 1. It is essential to the invention that such elements are applied to the inner side of the first transparent film 18 over a large area in a single process step together with the

embossed structures

20, 45.

Fig. 13A to 13D show a DID (diffraction identification device) window element 112 known from WO 2017/202866. These DID window elements can also be introduced into the document of value 1 together with the

embossing structures

20, 45 in one operation and are therefore security elements according to the invention.

Fig. 14A to 14C show the value document 1 in cross-sectional views. Similar to fig. 2, a substrate body 2 is shown, on which substrate body 2a first transparent film 18 is arranged. The first embossed structure 20, in which the metallization 22 is located, is arranged on the inner side of the first transparent film 18. Furthermore, an inner printed image 23 is applied to the base body 2 and an outer printed image 25 is applied to the base body 2 and to the first transparent film 18. A waveguide, not explicitly shown, is arranged between the substrate body 2 and the first transparent film 18. The waveguide has a coupling-in region 114 and a coupling-out region 116 (schematically shown by arrows). The waveguide may of course also be arranged between the substrate body 2 and the second transparent film 21.

The waveguide, which is not shown in detail, typically has a three-layer structure in which a thick high-refractive-index film serves as a light-guiding layer and is surrounded by two thin low-refractive-index films. For example, the film used as the waveguide may be printed with an LRI (low refractive index) lacquer. The coupling-in region 114 and the coupling-out region 116 are then produced by leaving a void in the LRI lacquer.

Fig. 15A shows a magnetic coding element 118 as already known from WO 2014/161674. Such a magnetic coding element 118 can also be applied in one process step as a first or second security element over a large area to the inner side of the first or second

transparent film

18, 21. In this embodiment, the mechanical reading is achieved by an NSMag sensor, which can be used similar to the terahertz sensor described.

Fig. 15B shows the value document 1 in a plan view. A plurality of magnetically active regions is applied to the base body 2 in the form of patches. The first magnetic patch 120 can be seen in fig. 15B, as well as the second magnetic patch 122 and the third magnetic patch 124.

Fig. 15C shows the structure resulting in the magnetic patches 120-124 in cross-section. In the present embodiment, an embossed structure 126 is provided as security element, which is provided in sections with a magnetic coating 128.

The embossed structures 126 can be applied in a single process step together with the first or second

embossed structures

20, 45 by embossing onto the inner side of the first or second

transparent film

18, 21. Likewise, the magnetic coating 128 can be applied in a single operation step together with the metallization 22. The magnetic patches 120 to 124 have a coating of LoCo (low coercivity), hiCo (high coercivity) or HiLoCo (combination of LoCo and HiCo) resulting in a security element that can only be read by machine.

A watermark in the form of a demetallised mesh design 130 may also be applied to the inner side of the

transparent films

18, 21. Fig. 16A-16D show examples of a demetallized mesh design 130. The ohmic dragon ring 132 can also be applied as a machine-readable security element, as shown in fig. 17. The demetallized anti-copy structure 134 according to fig. 18A to 18C may also be applied.

Fig. 19 shows a preferred embodiment of the value document 1. Fig. 20 shows a sectional view through the value document 1 in this embodiment, wherein the optical effect of the first embossing structure 20 with the metallization 22 in sections is illustrated on the basis of the first image 136 and the second image 138. The first imprint structures 20 are applied to the inner side of the first transparent film 18 directed to the substrate body 2. The first transparent film 18 is connected to the base main body 2 by an aluminum evaporation section 43. The substrate body 2 and the first transparent film 18 each have the specific dimensions L, B. In the present embodiment, the second transparent film 21 is not provided. It can be seen that the first image 136 perceived in a top view onto the front side of the value document 1 is designed mirror-inverted with respect to the second image 138 perceived in a top view onto the rear side of the value document 1. Furthermore, the two

images

136, 138 differ in color saturation.

Due to the metallization 22, the first image 136 produced by the first imprint structure 20 can also be recognized as a second image 138 viewed from the rear. In the preferred embodiment of fig. 20, the first embossing structure 20 is designed as a vertically asymmetrical structure, as is known from DE 10 2011 101 635 A1. This configuration produces different color saturations for the first image 136 and the second image 138.

It is known that an embossed structure 20 having a vertically symmetrical profile produces the same appearance when viewing the front and back sides. The imprinted structure 20 having a vertically symmetric profile is, for example, a one-dimensional periodic sub-wavelength grid, such as a line grid. In the following embodiments, such a vertically symmetrical profile is combined with a two-dimensional periodic grid having a vertically asymmetrical profile and showing the effects set forth in fig. 19 and 20, in order to be able to visualize an asymmetrical symbol or pattern identically and in front view when viewing the front and back of the value document 1.

Fig. 21A shows the front (left) and back (right) of the value document 1 in a top view. The value document has a substrate body 2 and the already described elements, namely the terahertz features 40, 42, the banknote printing 26, the security strip 28 and the serial number 10. A first transparent film 18, on the inner side of which a first embossed structure 20 is arranged, is applied to the substrate body 2. The second transparent film 21 is not provided. The structural configuration is the same as that shown in fig. 20. Unlike fig. 20, in this embodiment, a vertically symmetrical stamped feature is combined with a vertically asymmetrical stamped feature.

The first face 140 has a vertically symmetrical profile as does the second face 142. Here preferably a one-dimensional periodic sub-wavelength grid. In contrast, third face 144 and fourth face 146 have a vertically asymmetrical contour and therefore produce different color saturations when value document 1 is viewed from the front and the rear. The fifth side 148 appears on the rear side of the value document, produced on the inner side of the first transparent film 18 by the first embossed structures 20 arranged in the first side 140. The same applies to the sixth side 150, the seventh side 152 and the eighth side 154 as an appearance of the second side 142, the third side 144 and the fourth side 146 when viewing the rear side of the value document 1.

The outline of the first stamped structure 20 in the

faces

144 and 146 is vertically mirrored, so that the third face 144 and the eighth face 154 appear (or appear) to be identical in color when viewed from the respective sides. The same applies to the fourth and

seventh faces

146, 152. The contour of the embossed structures 20 in the third face 144 is selected such that the color appears to be the same as the color of the first face 140, so that the first face 140 and the third face 144 appear together as a face of uniform color, while the second region 142 and the fourth region 146 differ in the contour of the first embossed structure 20 and so that the denomination "5 —" can appear visibly. This effect is reversed when viewed from the back of the value document 1. The sixth face 150 and the eighth face 154 produce the same color impression, so that the face formed by the two faces 150, 154 together appears as a face of uniform color, while the fifth face 148 and the seventh face 152 visibly appear with the denomination "5 —".

Fig. 21B shows a further preferred embodiment in which different embossed structures 20 are present in a plurality of regions, so that a particular optical effect is produced. The basic structure corresponds to the structure of fig. 21A.

When viewed from the front side of the document of value 1, there is provided a first region 156 and a second region 158 in which the first embossing structure 20 is partially superimposed, which first embossing structure 20 produces the denomination "5 —". The same applies when the third region 160 and the fourth region 162 are viewed from the rear side of the value document 1. The first embossed structure 20 on the inner side of the first transparent film 18 is selected such that a strong contrast of the color saturation results when viewed from the front or back side. The peripheral region 164 is produced by the first imprint structure 20 having a vertically symmetrical profile, thus producing the same type of peripheral region 166 when viewing the back side. The first imprint structure 20 is selected such that the surrounding region 164 and the second region 158 or the surrounding region 166 and the fourth region 162 produce the same color appearance. Thereby, a view of the face looking forward of the denomination "5 —" becomes visible both when viewed from the front and when viewed from the back. The mirrored, oppositely imaged part of the first region 156 disappears, since in this embodiment the second region 158 has the outline of a vertical mirror image of the first region 156 and thus disappears as a region of uniform color with the surrounding region 164.

List of reference numerals

1. Value document

2. Substrate body

4. First optically variable element

6. Second optically variable element

8. Third optically variable element

10. Serial number

12. Number of

14. First picture element

16. Second picture element

18. A first transparent film

20. First imprint structure

22. Metallization

23. Internal printed image

24 DeMet region

25. External printed image

26. Banknote printing section

28. Anti-fake strip

30. Third optically variable element

32. Fourth optically variable element

34. First terahertz feature

36. Second terahertz feature

38. Third terahertz feature

40. Fourth terahertz feature

41. First region

42. Fifth terahertz feature

43. Aluminum evaporation coating section

44. Sixth terahertz feature

45. Second imprint structure

46. Second region

47. First gap structure

48. A third region

49. Second gap structure

50. Fourth region

52. Pattern(s)

54. First terahertz feature

56. Second terahertz feature

58. Third terahertz feature

59. Schematic diagram of

60. Wire grid

61. Banknote transport direction

62. Terahertz source

64. Terahertz detector

66. First graphic view

68. A first nanostructure

70. Second nanostructure

72. A third nanostructure

74. Fourth nanostructure

76. Fifth nanostructure

78. Second graphic view

80. Translucent metal grid

82. The first section

84. Second section

86. Third section

88. Light source

90. First optical effect

92. Second optical effect

94. Third optical Effect

96. Eye(s)

98. Bragg interference structure

100. A first direction

102. Corner

104. Second direction

105. Wire grid of metal

106 NFC element

107. Transmissive sub-wavelength grid

108. Nano-flakes

110. Coating layer

112 DID window element

114. Coupling-in area

116. Out-coupling region

118. Magnetic coding element

120. First magnetic patch

122. Second magnetic patch

124. Third magnetic patch

126. Impression structure

128. Magnetic coating

130. Demetallizing grid design

132. Ohm dragon ring

134. Demetallizing anti-copying structure

136. First image

138. Second image

140. First side

142. Second side

144. Third side

146. Fourth surface

148. Fifth surface

150. Sixth surface

152. Seventh aspect of the invention

154. Eighth aspect of the invention

156. First region

158. Second region

160. Third region

162. Fourth region

164. Peripheral region (front)

166. Peripheral region (Back)

Width B

Length of L

X second coordinate direction

First coordinate directions of Y1 and Y2

Claims

1. Value document, such as a banknote, a cheque, a credit card or other payment card, a certificate card or the like

-having a front side and a back side,

in a top view from the front, a view that can be recognized by the naked eye is shown,

-has a certain dimension (L, B) in top view, and

-having a substrate body (2) which has the specific dimension (L, B) in a top view and is connected to a first transparent film (18) having an inner side and an outer side in such a way that the substrate body (2) lies against the inner side of the first transparent film (18) so that the substrate body (2) points to the rear side and the outer side of the first transparent film (18) points to the front side, wherein,

-the first transparent film (18) also has said specific dimensions (L, B) in top view, and

-a view recognizable from the front side is produced by a metallized first embossed structure (20) arranged on the inner side of a first transparent film (18),

it is characterized in that the preparation method is characterized in that,

-a first security element which is only machine-readable is arranged on the inside of the first transparent film (18).

2. The document of value according to claim 1, characterized in that a second transparent film (21), which likewise has the specified dimensions (L, B) and has an inner side and an outer side, rests with its inner side on the substrate body (2) so that the outer side of the second transparent film (21) points towards the rear side of the document of value (1), wherein,

-a view recognizable from the back side is produced by a metallized second imprint structure (45),

-the metallized second imprint structure (45) is arranged on an inner side of the second transparent film (21), and

-a second security element which is only machine-readable is arranged on the inside of the second transparent film (21).

3. The value document according to claim 1 or 2, wherein the first and/or second security element influences the penetrating irradiation by terahertz radiation.

4. The document of value according to one of the preceding claims, characterized in that the first and/or the second security element exhibits a resonance effect for electromagnetic terahertz radiation incident in a predetermined frequency range.

5. Value document according to one of the preceding claims, characterized in that the first and/or second security element has a position-and/or direction-dependent conductivity.

6. The value document according to one of the preceding claims, wherein the first and/or the second security element has an NFC element (106).

7. The document of value according to one of the preceding claims, characterized in that the first and/or the second security element has a lattice structure, which lattice structure serves as an optical filter.

8. The value document according to one of the preceding claims, characterized in that the first and/or the second security element has a waveguide with a coupling-in region (114) and a coupling-out region (116).

9. The value document according to one of the preceding claims, wherein the first and/or second security element has a magnetic coding, which magnetic coding has a magnetic coding element.

10. The value document according to one of the preceding claims, characterized in that the first and/or the second security element has an electrical conductivity which is dependent on an externally applied magnetic field.

11. Value document according to one of the preceding claims, characterized in that the base body (2) is transparent.

12. The value document according to one of the preceding claims, characterized in that the first embossing structure (20) has a vertically asymmetrical profile in sections and a vertically symmetrical profile in sections.

13. Value document according to one of the preceding claims, characterized in that a conventional security element is applied to the front side and/or the rear side.

14. A method for producing a value document, such as a banknote, a check, a credit card or other payment card, a certificate card or the like, having a front side and a rear side, having specific dimensions (L, B) in a top view and showing a view that can be recognized with the naked eye in a top view from the front side, wherein,

-connecting the substrate body (2) having the specific dimension (L, B) in a top view with a first transparent film (18) also having the specific dimension (L, B) in a top view and having an inner side and an outer side in such a way that the substrate body (2) rests against the inner side of the first transparent film (18) so that the substrate body (2) points to the rear side and the outer side of the first transparent film (18) points to the front side, and

it is characterized in that the preparation method is characterized in that,

15. Method according to claim 14, characterized in that a second transparent film (21), which likewise has the specified dimensions (L, B) and has an inner side and an outer side, is applied with its inner side against the substrate body (2) so that the outer side of the second transparent film (21) points towards the rear side of the document of value (1),

wherein a second embossed structure (45) is arranged on the inner side of the second transparent film (21), a view that is recognizable from the rear side is produced by the second embossed structure, and a second security element that is only machine-readable is arranged on the inner side of the second transparent film (21).