DE102016005893A1 - Security element and disk - Google Patents

Abstract

The invention relates to a security element for securing documents of value, comprising a carrier substrate and an optically variable layer which imparts different color impressions at different viewing angles, wherein the optically variable layer is provided in a certain area with a semi-transparent ink layer and the absorption spectrum of the semitransparent ink layer so procure is that it clearly overlaps with the reflection spectrum of the optically variable layer at a first viewing angle.

Description

The invention relates to a security element and equipped with the security element disk, z. For example, a value document such as a banknote or an ID card.

Data carriers, such as valuables or identity documents, or other valuables, such as branded articles, are often provided with security elements for the purpose of security, which permit verification of the authenticity of the data carriers and at the same time serve as protection against unauthorized reproduction. Such security elements can be designed, for example, in the form of a security thread embedded in a banknote, a covering film for a banknote with a hole, an applied security strip, a self-supporting transfer element or else in the form of a feature area applied directly to a value document.

A special role in the authenticity assurance play security elements, the viewing angle-dependent visual effects show, as they can not be reproduced even with the latest copiers. The security elements are equipped with optically variable elements that give the viewer a different image impression at different viewing angles and, for example, show a different color or brightness impression and / or another graphic motif depending on the viewing angle.

In this context, it is known to use security elements with multi-layered thin-film elements whose color impression changes for the viewer with the viewing angle and changes when tilting the security feature, for example, from green to blue, from blue to magenta or from magenta to green. The occurrence of such color changes when tilting a security element is referred to below as a color shift effect.

The WO 2009/109291 A1 For example, describes a security element in which one above the other a thin-film element with color shift effect and a present in an embossing lacquer relief structure are arranged, wherein the embossing lacquer layer is metallized with the relief structure in partial areas and the relief structure of the partially metallized embossing lacquer layer is flattened with a transparent lacquer layer whose refractive index substantially corresponds to the refractive index of the embossing lacquer layer. The relief structure of the embossing lacquer layer may represent a diffractive structure, such as a hologram, a hologram lattice image or a hologram-like diffraction structure, or an achromatic structure, such as a matt structure with a non-colored, silvery matt appearance, a micromirror arrangement, a blaze lattice with a sawtooth-like Furrow profile or a Fresnel lens arrangement. The dimensions of the structural elements of the diffractive relief structures are usually in the order of magnitude of the wavelength of the light, that is to say generally between 300 nm and 1 μm. Some relief structures also have smaller structural elements, such as sub-wavelength gratings or moth-eye structures, whose structural elements may also be smaller than 100 nm. The structural elements of achromatic microrelief structures are sometimes larger than 1 .mu.m, the dimensions of micromirrors or Blazegitterlinien extend approximately to a height of about 15 microns and a lateral extent of about 30 microns. In an advantageous variant of the invention, the thin-film element has a reflection layer, an absorber layer and a dielectric spacer layer arranged between the reflection layer and the absorber layer. The color shift effect in such thin-film elements is based on viewing angle-dependent interference effects due to multiple reflections in the different sub-layers of the element. The path difference of the light reflected at the different layers depends on the one hand on the optical thickness of the dielectric spacer layer, which determines the distance between the absorber layer and the reflection layer, and on the other hand varies with the respective viewing angle. Since the path difference is on the order of the wavelength of the visible light, the result is an angle-dependent color impression for the viewer due to the extinction and amplification of certain wavelengths. By a suitable choice of material and thickness of the dielectric spacer layer, a multiplicity of different color-shift effects can be designed, for example tilting effects in which the color impression changes with the viewing angle from green to blue, from blue to magenta or from magenta to green.

Based on this, the present invention seeks to provide an improved security element of the type mentioned above with high anti-counterfeiting security and attractive visual appearance.

This object is achieved by the feature combinations defined in the independent claims. Further developments of the invention are the subject of the dependent claims.

Summary of the invention

• 1. (First aspect of the invention) Security element for securing value documents, comprising a carrier substrate and an optically variable layer, which under different Viewing angles different color impressions mediates, wherein the optically variable layer is provided in a certain area with a semi-transparent ink layer and the absorption spectrum of the semitransparent ink layer is such that it clearly overlaps with the reflection spectrum of the optically variable layer at least at a first viewing angle. The first viewing angle is in particular (i) the vertical or nearly vertical viewing of the security element, or (ii) the acute-angle viewing of the security element.
• 2. (Preferred embodiment) The security element according to paragraph 1, wherein the absorption spectrum of the semitransparent color layer is such that it clearly overlaps with the reflection spectrum of the optically variable layer at least at a first viewing angle and with the reflection spectrum of the optically variable layer at a second viewing angle in the Essentially does not overlap. In particular, (i) the first viewing angle is the perpendicular or nearly vertical viewing of the security element and the second viewing angle is the acute viewing of the security element, or (ii) the first viewing angle is the acute viewing of the security element and the second viewing angle is the perpendicular or nearly perpendicular viewing security element.
• 3. (Preferred Embodiment) A security element according to paragraph 1 or 2, wherein the clear overlap of the absorption spectrum of the semitransparent color layer is designed such that a reflection band of the optically variable layer at the first viewing angle is masked out by the semitransparent color layer. The reflection band of the optically variable layer is preferably within the visible spectral range.
• 4. (Preferred embodiment) The security element according to paragraph 3, wherein the security element (i) at the second viewing angle in the specific area on the one hand, in which the optically variable layer is provided with the semi-transparent ink layer, and outside of the specific area on the other hand, in which the optical variable layer is not provided with the semi-transparent ink layer, the same color impression mediates and (ii) at the first viewing angle in the particular area on the one hand, in which the optically variable layer is provided with the semi-transparent ink layer, and outside the certain range, on the other hand, in which optically variable layer is not provided with the semitransparent ink layer, a different color impression mediates.
• 5. (Preferred Embodiment) A security element according to any one of paragraphs 1 to 4, wherein (i) the first viewing angle represents the perpendicular viewing of the security element and the second viewing angle represents the acute angle viewing of the security element, or (ii) the first viewing angle is the acute viewing of the security element Represents security element and the second viewing angle represents the vertical view of the security element.
• 6. (Preferred embodiment) A security element according to any one of paragraphs 1 to 5, wherein the semitransparent ink layer is printed on the optically variable layer.
• 7. (Preferred embodiment) A security element according to one of the paragraphs 1 to 6, wherein the security element has an embossing lacquer layer which has in particular a diffractive structure forming relief structure and / or a micromirror arrangement forming relief structure and is preferably arranged between the carrier substrate and the optically variable layer.
• 8. (Preferred embodiment) The security element according to one of paragraphs 1 to 7, wherein the semitransparent color layer is contained in a protective lacquer, in a primer layer, in an embossing lacquer layer or in a heat seal lacquer layer or the semitransparent color layer contains a protective lacquer, a primer layer, an embossing lacquer layer or a Heat sealing lacquer layer forms.
• 9. (Preferred embodiment) A security element according to any one of paragraphs 1 to 7, wherein the semitransparent ink layer is contained in the embossing lacquer layer.
• 10. (Preferred embodiment) The security element according to paragraph 9, wherein the embossing lacquer layer has first regions with a low layer thickness and second regions with a high layer thickness and preferably the first regions on the one hand and the second regions on the other hand impart different color impressions at the first viewing angle.
• 11. (Preferred embodiment) A security element according to any one of paragraphs 1 to 10, wherein the semitransparent color layer is in the form of characters, patterns or codes or has recesses in the form of characters, patterns or codes.
• 12. (Preferred Embodiment) A security element according to any one of paragraphs 1 to 11, wherein the optically variable layer is formed by a thin-film element with a color shift effect.
• 13. The security element according to paragraph 12, wherein the thin-film element has a reflection layer, an absorber layer and a dielectric spacer layer arranged between the reflection layer and the absorber layer.
• 14. (Preferred embodiment) A security element according to any one of paragraphs 1 to 13, wherein the carrier substrate is transparent.
• 15. (Preferred embodiment) A security element according to any one of paragraphs 1 to 14, wherein the semitransparent color layer (i) is disposed above the optically variable layer on the side of the security element remote from the carrier substrate, or (ii) between the carrier substrate and the optically variable layer or (iii) is disposed above the carrier substrate on the side of the security element remote from the optically variable layer.
• 16. (Preferred embodiment) A security element according to any one of paragraphs 1 to 15, wherein the security element is a security thread, a security strip or a patch suitable for application to a value document.
• 17. (Second aspect of the invention) Data carrier with a security element according to one of the paragraphs 1 to 16.
• 18. (Preferred embodiment) Data carrier according to paragraph 17, wherein the data carrier is a value document, such as a banknote, in particular a paper banknote, polymer banknote or composite film banknote, or identity card.

Detailed description of the invention

The data carrier referred to in the present description can be a value document such as a banknote, in particular a paper banknote, a polymer banknote or a film composite banknote, a share, a bond, a certificate, a coupon, a check, a high-quality admission ticket, but It may also be an identification card, such as a credit card, a bank card, a cash card, an authorization card, an identity card, or a pass personalization page.

The security element according to the invention can, for. B. as a patch or label, as (endless) strip or as (endless) thread present.

The data carrier substrate of the data carrier to be equipped with the security element according to the invention is in particular a paper substrate or a paper-like substrate, a polymer substrate, a paper / film / paper composite substrate or a film / paper / film composite substrate. A security document provided with a window portion may be used in the case of a paper substrate, a paper / foil / paper composite substrate, or a foil / paper / foil composite substrate, e.g. B. by means of a continuous recess within the paper layers) are generated. Alternatively, the paper layer may be coated by means of a suitable liquid, e.g. B. by means of aqueous sulfuric acid solution are made transparent in a certain range. In the case of a value document based on a transparent polymer substrate, a window area may be z. B. by means of congruent recesses in the applied on the front and back of the polymer substrate opaque print layers are generated.

The commercially available optically variable layer structures known from the prior art, for example with a reflector-dielectric-absorber structure, exhibit a spectrum which is physically conditioned by the layer structure. Normally, a higher-order spectrum is used. If an interference spectrum at a defined wavelength is required, for reasons of production technology and for reasons of brilliance, the layer thickness of the dielectric is usually chosen such that the shortest wavelength pronounced reflection maximum is not optically effective.

The continuous production of a Farbkippenden layer structure from gold to green, for example, is associated with high difficulties, because a broad reflection maximum at about 667 nm is used for this optical impression, with slight deviations marginal areas of the reflection band disturb the color impression and for the dielectric layers, eg , As SiO ₂ layers, must be applied very evenly.

On the one hand, the use of the higher-order reflection maxima has the advantage of narrower reflection bands, on the other hand, the bands are so close to each other that several bands inevitably play a role in the overall color impression and, therefore, certain color impressions are not achieved.

The security element according to the invention is characterized in that, on the side facing the viewer, there is a semitransparent or translucent color layer (which is also simply referred to herein as a "color layer") whose absorption spectrum differs significantly with the reflection spectrum of the optically variable layer (FIG. eg a color-shifting layer structure or a thin-film element with a color-shift effect) overlaps at least at one viewing angle. The semitransparent or translucent ink layer may in particular be designed as a motif over part of the surface and / or as a motif.

Depending on the extent of the spectrum of the optically variable layer (for example a color-shifting layer structure or a thin-layer element with a color-shift effect), different optical effects are possible in this way:
Variant 1: A reflection band of the optically variable layer can be masked out by the color layer when viewed perpendicularly or almost perpendicularly. By way of example, a color-shifting layer structure obtainable by means of PVD results Magenta-green, over coated with "Ciba ^® ORASOL ^® Yellow 4GN", a color-shifting structure of red-green.

The reflection band at 424 nm is suppressed by the absorption band of the dye at about 430 nm. It leaves the reflection band at 633 nm, which is now responsible for the color shift effect. The short-wave band migrates when tilted in the UV range and remains optically ineffective.

Variant 2: A reflection band can be hidden by the color layer when viewed at an acute angle. For example, results in a commercially available PVD color canting-layer structure green-blue, over coated with "Ciba ^® ORASOL ^® Yellow 4GN", a color-shifting building green-black.

In this case, the optically effective reflection band, which is at almost vertical viewing at 512 nm, when tilted in the absorption range of the dye, whereby it is "extinguished". The further reflection band when viewed perpendicularly at 1038 nm is so long-wavy that it does not become optically effective even when tilted.

Option 3: A commercially available PVD color canting-layer structure green-magenta, over coated with "Ciba ^® ORASOL ^® Orange G", gives a color-shifting building green-red.

The reflection band at 511 nm is noticeably weakened by the absorption maximum at about 480 nm. Due to the high sensitivity of the human eye in the green area, the color impression of the layer structure remains green. When tilting, the reflection maximum moves into the short-wave range. This light is completely absorbed by the color layer, especially as the optical path through the dye layer becomes longer during tilting. When tilting, therefore, the color red appears, starting from the lying at a vertical viewing at 760 nm band, because the otherwise existing blue component of the short-wave band is hidden.

The shading of the green color when viewed perpendicularly can be controlled by the choice of the type of color layer which absorbs in a shorter wavelength range, e.g. B. various ORASOL Yellow types, can be adjusted.

Variant 4: Although there is a color-shifting effect with regard to certain color-shifting layer structures obtainable by means of PVD, the color-shift effect is difficult to achieve in view of additional disturbing reflection bands and / or a large width of the used band with edge regions critical for the color impression. For example, in the case of a color-shifting layer structure obtainable by means of PVD gold-green. Occurring blue light can by a yellow color layer, for. B. "ORASOL Yellow 4GN", are absorbed. When tilting "immigrant" bands from the long wavelength range can be characterized by a low concentration of a blue dye, eg. B. "ORASOL Blue GL" blocked.

In the security element according to the invention, the color layer is expediently arranged somewhere on the optical path between the optically variable layer and the viewer.

In the case of structures of security strips, security threads or a label (or a patch) for value documents may, for. For example, above a (film) substrate, first the color layer may be applied, followed by an absorber layer (eg Cr), a dielectric layer (eg SiO ₂ ), possibly a washcoat (ie one in a suitable solvent) soluble and thus washable layer, so that areas with recesses, so-called "Cleartext" or "negative writing", are available), and a reflector layer or reflective layer (eg Al). The combination with "gray" clear text has the advantage that the color layer above the thin, absorbent absorber layer (eg Cr) is largely invisible.

Furthermore, the color layer does not have to be directly attached to the optically variable layer, e.g. A thin-film element with a color-shift effect, but may be spaced apart by one or more intervening layers, such as a foil.

Furthermore, the color layer can form a protective lacquer or be contained in a protective lacquer, which is used for the protection of the optically variable layer, for. B. a thin-film element with color shift effect, is determined. The color layer can furthermore be contained in a primer layer, in a UV varnish or in a heat sealing varnish or form a primer layer, a UV varnish or a heat seal varnish. The color layer may in particular be contained in an embossing lacquer layer (eg a UV lacquer) or form an emboss lacquer layer (eg a UV lacquer).

• – ein Trägersubstrat, z. B. eine Folie wie etwa eine Polyethylenterephthalat(PET)-Folie;
• – optional eine Lackschicht, wie etwa ein UV-Lack;
• – eine Lackschicht, wie etwa ein UV-Lack, der semitransparent ist und dessen Absorptionsspektrum mit dem Reflexionsspektrum der optisch variablen Schicht zumindest bei einem Betrachtungswinkel deutlich überlappt; insbesondere wird eine Reflexionsbande der optisch variablen Schicht, die innerhalb des sichtbaren Spektralbereichs liegt, zumindest bei einem Betrachtungswinkel durch die semitransparente Lackschicht ausgeblendet; die Lackschicht ist insbesondere eine Prägelackschicht und weist eine diffraktive Struktur bildende Reliefstruktur und/oder eine Mikrospiegelanordnung bildende Reliefstruktur auf;
• – eine optisch variable Schicht, die insbesondere an die Reliefstruktur der vorangehenden Lackschicht angepasst ist; die optisch variable Schicht kann eine mehrschichtige Struktur aufweisen, z. B. eine Absorberschicht (z. B. Cr), gefolgt von einer Dielektrikumsschicht (z. B. SiO₂), gefolgt von einer Reflektorschicht (z. B. Al).

According to a first embodiment, the security element according to the invention has the following layer structure:

• A carrier substrate, e.g. A film such as a polyethylene terephthalate (PET) film;
• Optionally a lacquer layer, such as a UV lacquer;
• A lacquer layer, such as a UV lacquer, which is semitransparent and whose absorption spectrum clearly overlaps with the reflection spectrum of the optically variable layer, at least at one viewing angle; In particular, a reflection band of the optically variable layer which lies within the visible spectral range is masked out, at least at a viewing angle, by the semitransparent lacquer layer; the lacquer layer is in particular an embossing lacquer layer and has a relief structure forming a diffractive structure and / or a relief structure forming a micromirror arrangement;
• - An optically variable layer, which is particularly adapted to the relief structure of the preceding lacquer layer; the optically variable layer may have a multilayer structure, e.g. For example, an absorber layer (eg, Cr) followed by a dielectric layer (eg, SiO ₂ ) followed by a reflector layer (eg, Al).

The above semitransparent lacquer layer, which in particular has a relief structure, is formed according to a preferred variant in a first region with a high layer thickness and in a second region with a low layer thickness. In this way, different color impressions can be generated at a certain viewing angle.

• – ein Trägersubstrat, z. B. eine Folie wie etwa eine Polyethylenterephthalat(PET)-Folie;
• – optional eine Lackschicht, wie etwa ein UV-Lack;
• – ein Prägelack, wie etwa ein UV-Lack, der z. B. eine diffraktive Struktur bildende Reliefstruktur und/oder eine Mikrospiegelanordnung bildende Reliefstruktur aufweist;
• – der vorangehende Prägelack ist in Teilbereichen mit einer semitransparenten Farbschicht (z. B. eine drucktechnisch erhältliche Farbschicht) versehen, deren Absorptionsspektrum mit dem Reflexionsspektrum der optisch variablen Schicht zumindest bei einem Betrachtungswinkel deutlich überlappt; insbesondere wird eine Reflexionsbande der optisch variablen Schicht, die innerhalb des sichtbaren Spektralbereichs liegt, zumindest bei einem Betrachtungswinkel durch die semitransparente Farbschicht ausgeblendet; die semitransparente Farbschicht ist insbesondere in Form von Zeichen oder eines Musters oder einer Codierung gebildet oder weist Aussparungen in Form von Zeichen, eines Musters oder einer Codierung auf;
• – oberhalb des Prägelacks, der in Teilbereichen mit der semitransparenten Farbschicht versehen ist, ist eine optisch variable Schicht gebildet, die insbesondere (zumindest in den Bereichen außerhalb der semitransparenten Farbschicht) an die Reliefstruktur des Prägelacks angepasst ist; die optisch variable Schicht kann eine mehrschichtige Struktur aufweisen, z. B. eine Absorberschicht (z. B. Cr), gefolgt von einer Dielektrikumsschicht (z. B. SiO₂), gefolgt von einer Reflektorschicht (z. B. Al).

According to a second embodiment, the security element according to the invention has the following layer structure:

• A carrier substrate, e.g. A film such as a polyethylene terephthalate (PET) film;
• Optionally a lacquer layer, such as a UV lacquer;
• - An embossing lacquer, such as a UV lacquer, the z. B. has a diffractive structure forming relief structure and / or a micromirror arrangement forming relief structure;
• - The preceding embossing lacquer is provided in some areas with a semi-transparent ink layer (eg, a color layer available by printing), the absorption spectrum of which clearly overlaps the reflection spectrum of the optically variable layer, at least at one viewing angle; In particular, a reflection band of the optically variable layer which lies within the visible spectral range is masked out by the semitransparent color layer at least at a viewing angle; the semi-transparent ink layer is formed in particular in the form of characters or a pattern or a coding or has recesses in the form of characters, a pattern or an encoding;
• - Above the embossing lacquer, which is provided in partial areas with the semitransparent ink layer, an optically variable layer is formed, which is particularly adapted (at least in the areas outside of the semitransparent ink layer) to the relief structure of the embossing lacquer; the optically variable layer may have a multilayer structure, e.g. For example, an absorber layer (eg, Cr) followed by a dielectric layer (eg, SiO ₂ ) followed by a reflector layer (eg, Al).

• – ein Trägersubstrat, z. B. eine Folie wie etwa eine Polyethylenterephthalat(PET)-Folie;
• – eine z. B. drucktechnisch erhältliche Farbschicht, die semitransparent ist und deren Absorptionsspektrum mit dem Reflexionsspektrum der optisch variablen Schicht zumindest bei einem Betrachtungswinkel deutlich überlappt; insbesondere wird eine Reflexionsbande der optisch variablen Schicht, die innerhalb des sichtbaren Spektralbereichs liegt, zumindest bei einem Betrachtungswinkel durch die semitransparente Farbschicht ausgeblendet; die Farbschicht kann vollflächig oder nur bereichsweise, insbesondere in Form von Zeichen, eines Musters oder einer Codierung, vorliegen;
• – optional eine Lackschicht, wie etwa ein UV-Lack;
• – optional eine weitere Lackschicht, wie etwa ein UV-Lack;
• – eine optisch variable Schicht, z. B. in Form einer mehrschichtigen Struktur wie etwa der folgende Aufbau: Absorberschicht (z. B. Cr), gefolgt von einer Dielektrikumsschicht (z. B. SiO₂), gefolgt von einer Reflektorschicht (z. B. Al);
• – optional eine Klebschicht, z. B. ein Heißsiegellack, der für das Verkleben mit einem Wertdokumentsubstrat (z. B. ein Banknotensubstrat) geeignet ist.

According to a third embodiment, the security element according to the invention has the following layer structure:

• A carrier substrate, e.g. A film such as a polyethylene terephthalate (PET) film;
• - a z. B. technically available ink layer, which is semitransparent and whose absorption spectrum overlaps clearly with the reflection spectrum of the optically variable layer at least at a viewing angle; In particular, a reflection band of the optically variable layer which lies within the visible spectral range is masked out by the semitransparent color layer at least at a viewing angle; the color layer can be present over the whole area or only in certain areas, in particular in the form of characters, a pattern or an encoding;
• Optionally a lacquer layer, such as a UV lacquer;
• Optionally a further lacquer layer, such as a UV lacquer;
• - An optically variable layer, for. In the form of a multi-layered structure such as the following structure: absorber layer (e.g., Cr) followed by a dielectric layer (e.g., SiO ₂ ) followed by a reflector layer (e.g., Al);
• - Optionally an adhesive layer, for. A heat sealing lacquer suitable for bonding to a value document substrate (eg, a banknote substrate).

If appropriate, the carrier substrate can be designed as a removable carrier substrate. Ie. in the case of bonding the security element to a value document substrate, the carrier substrate may optionally be peeled off the value document substrate provided with the security element.

• – ein Trägersubstrat, z. B. eine Folie wie etwa eine Polyethylenterephthalat(PET)-Folie;
• – eine Lackschicht, wie etwa ein UV-Lack, der semitransparent ist und dessen Absorptionsspektrum mit dem Reflexionsspektrum der optisch variablen Schicht zumindest bei einem Betrachtungswinkel deutlich überlappt; insbesondere wird eine Reflexionsbande der optisch variablen Schicht, die innerhalb des sichtbaren Spektralbereichs liegt, zumindest bei einem Betrachtungswinkel durch die semitransparente Lackschicht ausgeblendet; die semitransparente Lackschicht kann vollflächig oder nur bereichsweise, insbesondere in Form von Zeichen, eines Musters oder einer Codierung, vorliegen;
• – optional eine Lackschicht, wie etwa ein UV-Lack;
• – eine optisch variable Schicht, z. B. in Form einer mehrschichtigen Struktur wie etwa der folgende Aufbau: Absorberschicht (z. B. Cr), gefolgt von einer Dielektrikumsschicht (z. B. SiO₂), gefolgt von einer Reflektorschicht (z. B. Al);
• – optional eine Klebschicht, z. B. ein Heißsiegellack, der für das Verkleben mit einem Wertdokumentsubstrat (z. B. ein Banknotensubstrat) geeignet ist.

According to a fourth embodiment, the security element according to the invention has the following layer structure:

• A carrier substrate, e.g. A film such as a polyethylene terephthalate (PET) film;
• A lacquer layer, such as a UV lacquer, which is semitransparent and whose absorption spectrum clearly overlaps with the reflection spectrum of the optically variable layer, at least at one viewing angle; In particular, a reflection band of the optically variable layer which lies within the visible spectral range is masked out, at least at a viewing angle, by the semitransparent lacquer layer; the semitransparent lacquer layer may be over the whole area or only partially, in particular in the form of characters, a pattern or an encoding;
• Optionally a lacquer layer, such as a UV lacquer;
• - An optically variable layer, for. In the form of a multi-layered structure such as the following structure: absorber layer (e.g., Cr) followed by a dielectric layer (e.g., SiO ₂ ) followed by a reflector layer (e.g., Al);
• - Optionally an adhesive layer, for. A heat sealing lacquer suitable for bonding to a value document substrate (eg, a banknote substrate).

If appropriate, the carrier substrate can be designed as a removable carrier substrate. Ie. in the case of bonding the security element to a value document substrate, the carrier substrate may optionally be peeled off the value document substrate provided with the security element.

• – ein Trägersubstrat, z. B. eine Folie wie etwa eine Polyethylenterephthalat(PET)-Folie;
• – optional eine Lackschicht, wie etwa ein UV-Lack;
• – eine Lackschicht, wie etwa ein UV-Lack, der semitransparent ist und dessen Absorptionsspektrum mit dem Reflexionsspektrum der optisch variablen Schicht zumindest bei einem Betrachtungswinkel deutlich überlappt; insbesondere wird eine Reflexionsbande der optisch variablen Schicht, die innerhalb des sichtbaren Spektralbereichs liegt, zumindest bei einem Betrachtungswinkel durch die semitransparente Lackschicht ausgeblendet; die Lackschicht kann vollflächig oder nur bereichsweise, insbesondere in Form von Zeichen, eines Musters oder einer Codierung, vorliegen;
• – eine optisch variable Schicht, z. B. in Form einer mehrschichtigen Struktur wie etwa der folgende Aufbau: Absorberschicht (z. B. Cr), gefolgt von einer Dielektrikumsschicht (z. B. SiO₂), gefolgt von einer Reflektorschicht (z. B. A1);
• – optional eine Klebschicht, z. B. ein Heißsiegellack, der für das Verkleben mit einem Wertdokumentsubstrat (z. B. ein Banknotensubstrat) geeignet ist.

According to a fifth embodiment, the security element according to the invention has the following layer structure:

• A carrier substrate, e.g. A film such as a polyethylene terephthalate (PET) film;
• Optionally a lacquer layer, such as a UV lacquer;
• A lacquer layer, such as a UV lacquer, which is semitransparent and whose absorption spectrum clearly overlaps with the reflection spectrum of the optically variable layer, at least at one viewing angle; In particular, a reflection band of the optically variable layer which lies within the visible spectral range is masked out, at least at a viewing angle, by the semitransparent lacquer layer; the lacquer layer may be present over the entire area or only in certain areas, in particular in the form of characters, a pattern or a coding;
• - An optically variable layer, for. In the form of a multi-layered structure such as the following structure: absorber layer (e.g., Cr) followed by a dielectric layer (e.g., SiO ₂ ) followed by a reflector layer (e.g., Al);
• - Optionally an adhesive layer, for. A heat sealing lacquer suitable for bonding to a value document substrate (eg, a banknote substrate).

If appropriate, the carrier substrate can be designed as a removable carrier substrate. Ie. in the case of bonding the security element to a value document substrate, the carrier substrate may optionally be peeled off the value document substrate provided with the security element.

• – eine Farbannahmeschicht, z. B. eine drucktechnisch erhältliche, auf SiO₂- oder Al₂O₃-Partikeln basierende Schicht;
• – eine Primer-Schicht, die semitransparent ist und deren Absorptionsspektrum mit dem Reflexionsspektrum der optisch variablen Schicht zumindest bei einem Betrachtungswinkel deutlich überlappt; insbesondere wird eine Reflexionsbande der optisch variablen Schicht, die innerhalb des sichtbaren Spektralbereichs liegt, zumindest bei einem Betrachtungswinkel durch die semitransparente Primer-Schicht ausgeblendet; die Primer-Schicht kann vollflächig oder nur bereichsweise, insbesondere in Form von Zeichen, eines Musters oder einer Codierung, vorliegen;
• – ein Trägersubstrat, z. B. eine Folie wie etwa eine Polyethylenterephthalat(PET)-Folie;
• – optional eine Lackschicht, wie etwa ein UV-Lack;
• – optional eine weitere Lackschicht, wie etwa ein UV-Lack;
• – eine optisch variable Schicht, z. B. in Form einer mehrschichtigen Struktur wie etwa der folgende Aufbau: Absorberschicht (z. B. Cr), gefolgt von einer Dielektrikumsschicht (z. B. SiO₂), gefolgt von einer Reflektorschicht (z. B. Al);
• – optional eine Klebschicht, z. B. ein Heißsiegellack, der für das Verkleben mit einem Wertdokumentsubstrat (z. B. ein Banknotensubstrat) geeignet ist.

According to a sixth embodiment, the security element according to the invention has the following layer structure:

• A paint receiving layer, e.g. B. a printing technology available based on SiO ₂ - or Al ₂ O ₃ particles layer;
• A primer layer which is semitransparent and whose absorption spectrum clearly overlaps with the reflection spectrum of the optically variable layer at least at one viewing angle; in particular, a reflection band of the optically variable layer which lies within the visible spectral range is masked out, at least at a viewing angle, by the semitransparent primer layer; the primer layer can be present over the whole area or only in certain regions, in particular in the form of characters, a pattern or a coding;
• A carrier substrate, e.g. A film such as a polyethylene terephthalate (PET) film;
• Optionally a lacquer layer, such as a UV lacquer;
• Optionally a further lacquer layer, such as a UV lacquer;
• - An optically variable layer, for. In the form of a multi-layered structure such as the following structure: absorber layer (e.g., Cr) followed by a dielectric layer (eg, SiO ₂ ) followed by a reflector layer (eg, Al);
• - Optionally an adhesive layer, for. A heat sealing lacquer suitable for bonding to a value document substrate (eg, a banknote substrate).

• – eine Farbannahmeschicht (z. B. eine drucktechnisch erhältliche, SiO₂- oder Al₂O₃-Partikel enthaltende Schicht), die semitransparent ist und deren Absorptionsspektrum mit dem Reflexionsspektrum der optisch variablen Schicht zumindest bei einem Betrachtungswinkel deutlich überlappt; insbesondere wird eine Reflexionsbande der optisch variablen Schicht, die innerhalb des sichtbaren Spektralbereichs liegt, zumindest bei einem Betrachtungswinkel durch die semitransparente Farbannahmeschicht ausgeblendet; die Farbannahmeschicht kann vollflächig oder nur bereichsweise, insbesondere in Form von Zeichen, eines Musters oder einer Codierung, vorliegen;
• – eine Primer-Schicht;
• – ein Trägersubstrat, z. B. eine Folie wie etwa eine Polyethylenterephthalat(PET)-Folie;
• – optional eine Lackschicht, wie etwa ein UV-Lack;
• – optional eine weitere Lackschicht, wie etwa ein UV-Lack;
• – eine optisch variable Schicht, z. B. in Form einer mehrschichtigen Struktur wie etwa der folgende Aufbau: Absorberschicht (z. B. Cr), gefolgt von einer Dielektrikumsschicht (z. B. SiO₂), gefolgt von einer Reflektorschicht (z. B. Al);
• – optional eine Klebschicht, z. B. ein Heißsiegellack, der für das Verkleben mit einem Wertdokumentsubstrat (z. B. ein Banknotensubstrat) geeignet ist.

According to a seventh embodiment, the security element according to the invention has the following layer structure:

• A color accepting layer (eg a printable layer containing SiO ₂ or Al ₂ O ₃ particles) which is semitransparent and whose absorption spectrum clearly overlaps with the reflection spectrum of the optically variable layer at least at one viewing angle; in particular, a reflection band of the optically variable layer which lies within the visible spectral range is masked out, at least at a viewing angle, by the semitransparent ink accepting layer; the ink-accepting layer may be present over the whole area or only in certain areas, in particular in the form of characters, a pattern or a coding;
• A primer layer;
• A carrier substrate, e.g. A film such as a polyethylene terephthalate (PET) film;
• Optionally a lacquer layer, such as a UV lacquer;
• Optionally a further lacquer layer, such as a UV lacquer;
• - An optically variable layer, for. In the form of a multi-layered structure such as the following structure: absorber layer (e.g., Cr) followed by a dielectric layer (e.g., SiO ₂ ) followed by a reflector layer (e.g., Al);
• - Optionally an adhesive layer, for. A heat sealing lacquer suitable for bonding to a value document substrate (eg, a banknote substrate).

• – eine Farbannahmeschicht, z. B. eine drucktechnisch erhältliche, auf SiO₂- oder Al₂O₃-Partikeln basierende Schicht;
• – eine Primer-Schicht;
• – ein Trägersubstrat, z. B. eine Folie wie etwa eine Polyethylenterephthalat(PET)-Folie;
• – eine semitransparente Farbschicht, deren Absorptionsspektrum mit dem Reflexionsspektrum der optisch variablen Schicht zumindest bei einem Betrachtungswinkel deutlich überlappt; insbesondere wird eine Reflexionsbande der optisch variablen Schicht, die innerhalb des sichtbaren Spektralbereichs liegt, zumindest bei einem Betrachtungswinkel durch die semitransparente Farbannahmeschicht ausgeblendet; die semitransparente Farbschicht kann vollflächig oder nur bereichsweise, insbesondere in Form von Zeichen, eines Musters oder einer Codierung, vorliegen;
• – optional eine Lackschicht, wie etwa ein UV-Lack;
• – optional eine weitere Lackschicht, wie etwa ein UV-Lack;
• – eine optisch variable Schicht, z. B. in Form einer mehrschichtigen Struktur wie etwa der folgende Aufbau: Absorberschicht (z. B. Cr), gefolgt von einer Dielektrikumsschicht (z. B. SiO₂), gefolgt von einer Reflektorschicht (z. B. Al);
• – optional eine Klebschicht, z. B. ein Heißsiegellack, der für das Verkleben mit einem Wertdokumentsubstrat (z. B. ein Banknotensubstrat) geeignet ist.

According to an eighth embodiment, the security element according to the invention has the following layer structure:

• A paint receiving layer, e.g. B. a printing technology available based on SiO ₂ - or Al ₂ O ₃ particles layer;
• A primer layer;
• A carrier substrate, e.g. A film such as a polyethylene terephthalate (PET) film;
• A semitransparent color layer whose absorption spectrum clearly overlaps with the reflection spectrum of the optically variable layer at least at one viewing angle; in particular, a reflection band of the optically variable layer which lies within the visible spectral range is masked out, at least at a viewing angle, by the semitransparent ink accepting layer; the semitransparent ink layer may be present over the entire area or only in certain areas, in particular in the form of characters, a pattern or an encoding;
• Optionally a lacquer layer, such as a UV lacquer;
• Optionally a further lacquer layer, such as a UV lacquer;
• - An optically variable layer, for. In the form of a multi-layered structure such as the following structure: absorber layer (e.g., Cr) followed by a dielectric layer (e.g., SiO ₂ ) followed by a reflector layer (e.g., Al);
• - Optionally an adhesive layer, for. A heat sealing lacquer suitable for bonding to a value document substrate (eg, a banknote substrate).

Further exemplary embodiments and advantages of the invention are explained below with reference to the figures, in the representation of which a representation true to scale and proportion has been dispensed with in order to increase the clarity.

Show it:

1 the reflection spectrum of a color-shifting layer structure "magenta-green" obtainable by means of PVD;

2 the transmission spectrum of a green-yellow layer on the basis of the substance "Ciba ^{® ®} Yellow 4GN ORASOL";

3 a film in plan view when viewed vertically, wherein the film in the upper part of a PVD available Farbkippendenden layer structure "magenta-green" and in the lower part color-tilting layer structure "red-green" having by printing a farbkippendenden layer structure "magenta-green" was obtained with a green-yellow layer on the basis of the substance "Ciba ^{® ®} yellow 4GN ORASOL";

4 a film in plan view when viewed at an acute angle, wherein the film has in the upper part available by PVD Farbkippendenden layer structure "magenta-green" and in the lower part Farbkippenden layer structure "red-green" having by printing a farbkippendenden layer structure "magenta-green" was obtained with a green-yellow layer on the basis of the substance "Ciba ^{® ®} yellow 4GN ORASOL";

5 a security element according to the invention according to a first embodiment;

6 an inventive security element according to a second embodiment;

7 a security element according to the invention according to a third embodiment;

8th a security element according to the invention according to a fourth embodiment;

9 a security element according to the invention according to a fifth embodiment;

10 an inventive security element according to a sixth embodiment;

11 an inventive security element according to a seventh embodiment;

12 an inventive security element according to an eighth embodiment.

1 shows the reflection spectrum of an available by PVD Farbkippenden layer structure "magenta-green". In the spectrum shown, the percentage of reflected light (vertical axis) relative to the wavelength of the light (right axis) is plotted. With the reference number 1 is the reflection band at 424 nm. The color-shifting layer structure "magenta-green" is magenta-colored when viewed vertically or almost perpendicularly and shows the color green when viewed at an acute angle.

2 shows the transmission spectrum of a printing-technically obtained, green-yellow layer based on the substance "Ciba ^® ORASOL ^® Yellow 4GN". In the spectrum shown is the percentage of the transmitted or transmitted light (vertical axis) relative to the wavelength of the light (Right axis) applied. With the reference number 2 is the absorption band of the dye at about 430 nm.

3 shows a slide 3 in plan view in vertical (or nearly vertical) viewing, the film 3 in the upper area 4 has a color-tilting layer structure "magenta-green" obtainable by means of PVD and in the lower area 5 a color-shifting layer structure "red-green", which was obtained by printing a Farbkippendenden layer structure "magenta-green" with a green-yellow layer based on the dye "Ciba ^® ORASOL ^® Yellow 4GN". In this case, the absorption band of the dye at approximately 430 nm suppresses the reflection band of the color-shifting layer structure at 424 nm. It leaves the reflection band at 633 nm, which is now responsible for the color shift effect. The short-wave band migrates when tilted in the UV range and remains optically ineffective. The foil 3 appears in vertical (or nearly vertical) viewing in the upper area 4 Magenta-colored and at the bottom 5 reddish.

4 shows the foil 3 in plan view with acute angle viewing. The foil 3 appears in its entire area in green color.

• – ein Trägersubstrat 7, z. B. eine wie wie etwa eine Polyethylenterephthalat(PET)-Folie;
• – ein UV-Lack 8;
• – ein UV-Lack 9, der semitransparent ist und dessen Absorptionsspektrum mit dem Reflexionsspektrum der optisch variablen Schicht 10 zumindest bei einem Betrachtungswinkel deutlich überlappt; dabei wird eine Reflexionsbande der optisch variablen Schicht 10, die innerhalb des sichtbaren Spektralbereichs liegt, zumindest bei einem Betrachtungswinkel durch den semitransparenten UV-Lack 9 ausgeblendet; der UV-Lack 9 ist eine Prägelackschicht und weist eine Mikrospiegelanordnung bildende Reliefstruktur auf;
• – eine optisch variable Schicht 10, die an die Reliefstruktur der vorangehenden Lackschicht 9 angepasst ist; die optisch variable Schicht 10 weist eine mehrschichtige Struktur auf, nämlich eine Absorberschicht 11 (Cr), gefolgt von einer Dielektrikumsschicht 12 (SiO₂), gefolgt von einer Reflektorschicht 13 (Al).

5 shows a security element according to the invention 6 according to a first embodiment. The security element 6 has the following layer structure:

• A carrier substrate 7 , z. A such as a polyethylene terephthalate (PET) film;
• - a UV varnish 8th ;
• - a UV varnish 9 which is semitransparent and its absorption spectrum with the reflection spectrum of the optically variable layer 10 clearly overlapped at least at one viewing angle; In this case, a reflection band of the optically variable layer 10 which is within the visible spectral range, at least at a viewing angle through the semitransparent UV varnish 9 hidden; the UV varnish 9 is an embossing lacquer layer and has a relief structure forming a micromirror arrangement;
• - an optically variable layer 10 attached to the relief structure of the preceding lacquer layer 9 is adjusted; the optically variable layer 10 has a multi-layered structure, namely an absorber layer 11 (Cr), followed by a dielectric layer 12 (SiO _2), followed by a reflector layer 13 (Al).

The above, a relief structure having semitransparent paint layer 9 is formed in the regions indicated by the letter "A" having a high film thickness and formed in the low film thickness region indicated by the letter "B". In this way, different color impressions can be generated at a certain viewing angle.

• – ein Trägersubstrat 15, z. B. eine Polyethylenterephthalat(PET)-Folie;
• – ein UV-Lack 16;
• – eine Prägelack 17, z. B. ein UV-Lack, der eine diffraktive Struktur bildende Reliefstruktur und/oder eine Mikrospiegelanordnung bildende Reliefstruktur aufweist;
• – der vorangehende Prägelack 17 ist in Teilbereichen mit einer semitransparenten Farbschicht 18 (z. B. eine drucktechnisch erhältliche Farbschicht) versehen, deren Absorptionsspektrum mit dem Reflexionsspektrum der optisch variablen Schicht (19, 20, 21) zumindest bei einem Betrachtungswinkel deutlich überlappt; insbesondere wird eine Reflexionsbande der optisch variablen Schicht (19, 20, 21), die innerhalb des sichtbaren Spektralbereichs liegt, zumindest bei einem Betrachtungswinkel durch die semitransparente Farbschicht 18 ausgeblendet; die semitransparente Farbschicht 18 ist insbesondere in Form von Zeichen oder eines Musters oder einer Codierung gebildet oder weist Aussparungen in Form von Zeichen, eines Musters oder einer Codierung auf;
• – oberhalb des Prägelacks 17, der in Teilbereichen mit der semitransparenten Farbschicht 18 versehen ist, ist eine optisch variable Schicht gebildet, die in den Bereichen außerhalb der semitransparenten Farbschicht 18 an die Reliefstruktur des Prägelacks 17 angepasst ist; die optisch variable Schicht weist eine mehrschichtige Struktur auf, nämlich eine Absorberschicht 19 (z. B. Cr), gefolgt von einer Dielektrikumsschicht 20 (z. B. SiO₂), gefolgt von einer Reflektorschicht 21 (z. B. Al).

6 shows a security element according to the invention 14 according to a second embodiment. The security element 14 has the following layer structure:

• A carrier substrate 15 , z. B. a polyethylene terephthalate (PET) film;
• - a UV varnish 16 ;
• - an embossing lacquer 17 , z. B. a UV varnish having a diffractive structure forming relief structure and / or a micromirror arrangement forming relief structure;
• - the previous embossing lacquer 17 is in partial areas with a semi-transparent color layer 18 (for example a color layer which can be obtained by printing technology) whose absorption spectrum is compared with the reflection spectrum of the optically variable layer ( 19 . 20 . 21 ) clearly overlaps at least at one viewing angle; In particular, a reflection band of the optically variable layer ( 19 . 20 . 21 ) which is within the visible spectral range, at least at a viewing angle through the semi-transparent ink layer 18 hidden; the semi-transparent ink layer 18 is formed in particular in the form of characters or a pattern or a coding or has recesses in the form of characters, a pattern or an encoding;
• - above the embossing lacquer 17 working in partial areas with the semitransparent color layer 18 is provided, an optically variable layer is formed, which in the areas outside the semitransparent ink layer 18 to the relief structure of the embossing lacquer 17 is adjusted; the optically variable layer has a multilayer structure, namely an absorber layer 19 (e.g., Cr), followed by a dielectric layer 20 (eg SiO ₂ ), followed by a reflector layer 21 (eg Al).

• – ein Trägersubstrat 23, z. B. eine Folie wie etwa eine Polyethylenterephthalat(PET)-Folie;
• – eine drucktechnisch erhältliche Farbschicht 24, die semitransparent ist und deren Absorptionsspektrum mit dem Reflexionsspektrum der optisch variablen Schicht 27 zumindest bei einem Betrachtungswinkel deutlich überlappt; insbesondere wird eine Reflexionsbande der optisch variablen Schicht 27, die innerhalb des sichtbaren Spektralbereichs liegt, zumindest bei einem Betrachtungswinkel durch die semitransparente Farbschicht 24 ausgeblendet; die Farbschicht 24 kann vollflächig oder nur bereichsweise, insbesondere in Form von Zeichen, eines Musters oder einer Codierung, vorliegen;
• – optional eine Lackschicht 25, wie etwa ein UV-Lack;
• – optional eine weitere Lackschicht 26, wie etwa ein UV-Lack;
• – eine optisch variable Schicht 27, im Beispiel in Form einer mehrschichtigen Struktur mit dem folgenden Aufbau: Absorberschicht 28 (Cr), gefolgt von einer Dielektrikumsschicht 29 (SiO₂), gefolgt von einer Reflektorschicht 30 (Al);
• – optional eine Klebschicht (in der 7 nicht gezeigt), z. B. ein Heißsiegellack, der für das Verkleben mit einem Wertdokumentsubstrat (z. B. ein Banknotensubstrat) geeignet ist.

7 shows a security element according to the invention 22 according to a third embodiment. The security element 22 has the following layer structure:

• A carrier substrate 23 , z. A film such as a polyethylene terephthalate (PET) film;
• - A printable color layer 24 which is semitransparent and their absorption spectrum with the reflection spectrum of the optically variable layer 27 clearly overlapped at least at one viewing angle; In particular, a reflection band of the optically variable layer becomes 27 which is within the visible spectral range, at least at a viewing angle through the semi-transparent ink layer 24 hidden; the color layer 24 can be over the entire area or only partially, in particular in the form of characters, a pattern or an encoding;
• - Optionally a lacquer layer 25 such as a UV varnish;
• - Optionally, another coat of paint 26 such as a UV varnish;
• - an optically variable layer 27 , in the example in the form of a multilayer structure with the following structure: absorber layer 28 (Cr), followed by a dielectric layer 29 (SiO ₂ ), followed by a reflector layer 30 (Al);
• - Optionally an adhesive layer (in the 7 not shown), e.g. A heat sealing lacquer suitable for bonding to a value document substrate (eg, a banknote substrate).

The carrier substrate 23 may optionally be designed as a removable carrier substrate. Ie. in the case of bonding the security element 22 with a value document substrate, the carrier substrate 23 optionally from that with the security element 22 replaced value document substrate.

• – ein Trägersubstrat 32, z. B. eine Folie wie etwa eine Polyethylenterephthalat(PET)-Folie;
• – ein UV-Lack 33, der semitransparent ist und dessen Absorptionsspektrum mit dem Reflexionsspektrum der optisch variablen Schicht 35 zumindest bei einem Betrachtungswinkel deutlich überlappt; insbesondere wird eine Reflexionsbande der optisch variablen Schicht 35, die innerhalb des sichtbaren Spektralbereichs liegt, zumindest bei einem Betrachtungswinkel durch den semitransparenten UV-Lack 33 ausgeblendet; der semitransparente UV-Lack 33 kann vollflächig oder nur bereichsweise, insbesondere in Form von Zeichen, eines Musters oder einer Codierung, vorliegen;
• – optional ein weiterer UV-Lack 34;
• – eine optisch variable Schicht 35, z. B. in Form einer mehrschichtigen Struktur mit dem folgenden Aufbau: Absorberschicht 36 (Cr), gefolgt von einer Dielektrikumsschicht 37 (SiO₂), gefolgt von einer Reflektorschicht 38 (Al);
• – optional eine Klebschicht (in der 8 nicht gezeigt), z. B. ein Heißsiegellack, der für das Verkleben mit einem Wertdokumentsubstrat (z. B. ein Banknotensubstrat) geeignet ist.

8th shows a security element according to the invention 31 according to a fourth embodiment. The security element 31 has the following layer structure:

• A carrier substrate 32 , z. A film such as a polyethylene terephthalate (PET) film;
• - a UV varnish 33 which is semitransparent and its absorption spectrum with the reflection spectrum of the optically variable layer 35 clearly overlapped at least at one viewing angle; In particular, a reflection band of the optically variable layer becomes 35 which is within the visible spectral range, at least at a viewing angle through the semitransparent UV varnish 33 hidden; the semi-transparent UV varnish 33 may be present over the whole area or only partially, in particular in the form of characters, a pattern or a coding;
• - Optionally, another UV varnish 34 ;
• - an optically variable layer 35 , z. B. in the form of a multi-layered structure with the following structure: absorber layer 36 (Cr), followed by a dielectric layer 37 (SiO ₂ ), followed by a reflector layer 38 (Al);
• - Optionally an adhesive layer (in the 8th not shown), e.g. A heat sealing lacquer suitable for bonding to a value document substrate (eg, a banknote substrate).

The carrier substrate 32 may optionally be designed as a removable carrier substrate. Ie. in the case of gluing the security element 31 with a value document substrate, the carrier substrate 32 optionally from that with the security element 31 replaced value document substrate.

• – ein Trägersubstrat 40, z. B. eine Folie wie etwa eine Polyethylenterephthalat(PET)-Folie;
• – ein UV-Lack 41;
• – ein UV-Lack 42, der semitransparent ist und dessen Absorptionsspektrum mit dem Reflexionsspektrum der optisch variablen Schicht 43 zumindest bei einem Betrachtungswinkel deutlich überlappt; insbesondere wird eine Reflexionsbande der optisch variablen Schicht 43, die innerhalb des sichtbaren Spektralbereichs liegt, zumindest bei einem Betrachtungswinkel durch den semitransparenten UV-Lack ausgeblendet; der semitransparente UV-Lack kann vollflächig oder nur bereichsweise, insbesondere in Form von Zeichen, eines Musters oder einer Codierung, vorliegen;
• – eine optisch variable Schicht 43, z. B. in Form einer mehrschichtigen Struktur mit dem folgenden Aufbau: Absorberschicht 44 (Cr), gefolgt von einer Dielektrikumsschicht 45 (SiO₂), gefolgt von einer Reflektorschicht 46 (Al);
• – optional eine Klebschicht (in der 9 nicht gezeigt), z. B. ein Heißsiegellack, der für das Verkleben mit einem Wertdokumentsubstrat (z. B. ein Banknotensubstrat) geeignet ist.

9 shows a security element according to the invention 39 according to a fifth embodiment. The security element 39 has the following layer structure:

• A carrier substrate 40 , z. A film such as a polyethylene terephthalate (PET) film;
• - a UV varnish 41 ;
• - a UV varnish 42 which is semitransparent and its absorption spectrum with the reflection spectrum of the optically variable layer 43 clearly overlapped at least at one viewing angle; In particular, a reflection band of the optically variable layer becomes 43 which lies within the visible spectral range, at least at a viewing angle hidden by the semitransparent UV varnish; the semitransparent UV varnish can be present over the whole area or only in certain areas, in particular in the form of characters, a pattern or an encoding;
• - an optically variable layer 43 , z. B. in the form of a multi-layered structure with the following structure: absorber layer 44 (Cr), followed by a dielectric layer 45 (SiO ₂ ), followed by a reflector layer 46 (Al);
• - Optionally an adhesive layer (in the 9 not shown), e.g. A heat sealing lacquer suitable for bonding to a value document substrate (eg, a banknote substrate).

The carrier substrate 40 may optionally be designed as a removable carrier substrate. Ie. in the case of gluing the security element 39 with a value document substrate, the carrier substrate 39 optionally from that with the security element 39 replaced value document substrate.

• – eine Farbannahmeschicht 48, z. B. eine drucktechnisch erhältliche, auf SiO₂- oder Al2O₃-Partikeln basierende Schicht;
• – eine Primer-Schicht 49, die semitransparent ist und deren Absorptionsspektrum mit dem Reflexionsspektrum der optisch variablen Schicht 53 zumindest bei einem Betrachtungswinkel deutlich überlappt; insbesondere wird eine Reflexionsbande der optisch variablen Schicht 53, die innerhalb des sichtbaren Spektralbereichs liegt, zumindest bei einem Betrachtungswinkel durch die semitransparente Primer-Schicht 49 ausgeblendet; die Primer-Schicht 49 kann vollflächig oder nur bereichsweise, insbesondere in Form von Zeichen, eines Musters oder einer Codierung, vorliegen;
• – ein Trägersubstrat 50, z. B. eine Folie wie etwa eine Polyethylenterephthalat(PET)-Folie;
• – optional eine Lackschicht 51, wie etwa ein UV-Lack;
• – optional eine weitere Lackschicht 52, wie etwa ein UV-Lack;
• – eine optisch variable Schicht 53, z. B. in Form einer mehrschichtigen Struktur mit dem folgenden Aufbau: Absorberschicht 54 (Cr), gefolgt von einer Dielektrikumsschicht 55 (SiO₂), gefolgt von einer Reflektorschicht 56 (z. B. Al);
• – optional eine Klebschicht (in der 10 nicht gezeigt), z. B. ein Heißsiegellack, der für das Verkleben mit einem Wertdokumentsubstrat (z. B. ein Banknotensubstrat) geeignet ist.

10 shows a security element according to the invention 47 according to a sixth embodiment. The security element 47 has the following layer structure:

• - a paint acceptance layer 48 , z. B. a pressure-technically available, based on SiO ₂ - or Al ₂ O ₃ particles layer;
• A primer layer 49 which is semitransparent and their absorption spectrum with the reflection spectrum of the optically variable layer 53 clearly overlapped at least at one viewing angle; In particular, a reflection band of the optically variable layer becomes 53 which is within the visible spectral range, at least at a viewing angle through the semitransparent primer layer 49 hidden; the primer layer 49 may be present over the whole area or only partially, in particular in the form of characters, a pattern or a coding;
• A carrier substrate 50 , z. A film such as a polyethylene terephthalate (PET) film;
• - Optionally a lacquer layer 51 such as a UV varnish;
• - Optionally, another coat of paint 52 such as a UV varnish;
• - an optically variable layer 53 , z. B. in the form of a multi-layered structure with the following structure: absorber layer 54 (Cr), followed by a dielectric layer 55 (SiO ₂ ), followed by a reflector layer 56 (eg Al);
• - Optionally an adhesive layer (in the 10 not shown), e.g. A heat sealing lacquer suitable for bonding to a value document substrate (eg, a banknote substrate).

• – eine Farbarmahmeschicht 58 (z. B. eine drucktechnisch erhältliche, SiO₂- oder Al₂O₃-Partikel enthaltende Schicht), die semitransparent ist und deren Absorptionsspektrum mit dem Reflexionsspektrum der optisch variablen Schicht 63 zumindest bei einem Betrachtungswinkel deutlich überlappt; insbesondere wird eine Reflexionsbande der optisch variablen Schicht 63, die innerhalb des sichtbaren Spektralbereichs liegt, zumindest bei einem Betrachtungswinkel durch die semitransparente Farbannahmeschicht 58 ausgeblendet; die Farbannahmeschicht 58 kann vollflächig oder nur bereichsweise, insbesondere in Form von Zeichen, eines Musters oder einer Codierung, vorliegen;
• – eine Primer-Schicht 59;
• – ein Trägersubstrat 60, z. B. eine Folie wie etwa eine Polyethylenterephthalat(PET)-Folie;
• – optional eine Lackschicht 61, wie etwa ein UV-Lack;
• – optional eine weitere Lackschicht 62, wie etwa ein UV-Lack;
• – eine optisch variable Schicht 63, z. B. in Form einer mehrschichtigen Struktur mit dem folgenden Aufbau: Absorberschicht 64 (Cr), gefolgt von einer Dielektrikumsschicht 65 (SiO₂), gefolgt von einer Reflektorschicht 66 (Al);
• – optional eine Klebschicht (in der 11 nicht gezeigt), z. B. ein Heißsiegellack, der für das Verkleben mit einem Wertdokumentsubstrat (z. B. ein Banknotensubstrat) geeignet ist.

11 shows a security element according to the invention 57 according to a seventh embodiment. The security element 57 has the following layer structure:

• - a Farbarmahmeschicht 58 (For example, a commercially available, SiO ₂ - or Al ₂ O ₃ particles containing layer), which is semitransparent and their absorption spectrum with the reflection spectrum of the optically variable layer 63 clearly overlapped at least at one viewing angle; In particular, a reflection band of the optically variable layer becomes 63 which is within the visible spectral range, at least at a viewing angle through the semitransparent ink accepting layer 58 hidden; the paint acceptance layer 58 may be present over the whole area or only partially, in particular in the form of characters, a pattern or a coding;
• A primer layer 59 ;
• A carrier substrate 60 , z. A film such as a polyethylene terephthalate (PET) film;
• - Optionally a lacquer layer 61 such as a UV varnish;
• - Optionally, another coat of paint 62 such as a UV varnish;
• - an optically variable layer 63 , z. B. in the form of a multi-layered structure with the following structure: absorber layer 64 (Cr), followed by a dielectric layer 65 (SiO ₂ ), followed by a reflector layer 66 (Al);
• - Optionally an adhesive layer (in the 11 not shown), e.g. A heat sealing lacquer suitable for bonding to a value document substrate (eg, a banknote substrate).

12 shows a security element according to the invention 67 according to an eighth embodiment. The security element 67 has the following layer structure:

• - a paint acceptance layer 68 , z. B. a pressure-technically available, based on SiO ₂ - or Al ₂ O ₃ particles layer;
• A primer layer 69 ;
• A carrier substrate 70 , z. A film such as a polyethylene terephthalate (PET) film;
• - A semi-transparent, technically available ink layer 71 , whose absorption spectrum with the reflection spectrum of the optically variable layer 74 clearly overlapped at least at one viewing angle; In particular, a reflection band of the optically variable layer becomes 74 which is within the visible spectral range, at least at a viewing angle through the semitransparent ink accepting layer 71 hidden; the semi-transparent ink layer 71 may be present over the whole area or only partially, in particular in the form of characters, a pattern or a coding;
• - Optionally a lacquer layer 72 . such as a UV varnish;
• - Optionally, another coat of paint 73 such as a UV varnish;
• - an optically variable layer 74 , z. In the form of a multi-layered structure such as the following structure: absorber layer 75 (e.g., Cr), followed by a dielectric layer 76 (eg SiO ₂ ), followed by a reflector layer 77 (eg Al);
• - Optionally an adhesive layer (in the 12 not shown), e.g. A heat sealing lacquer suitable for bonding to a value document substrate (eg, a banknote substrate).

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• WO 2009/109291 A1 [0005]

Claims (18)

A security element for securing value documents, comprising a carrier substrate and an optically variable layer, which gives different color impressions at different viewing angles, wherein the optically variable layer is provided with a semi-transparent ink layer in a certain area and the absorption spectrum of the semitransparent ink layer is such that it clearly overlaps with the reflection spectrum of the optically variable layer at least at a first viewing angle. The security element of claim 1, wherein the absorption spectrum of the semitransparent color layer is such that it overlaps significantly with the reflection spectrum of the optically variable layer at least at a first viewing angle and does not substantially overlap with the reflection spectrum of the optically variable layer at a second viewing angle. A security element according to claim 1 or 2, wherein the significant overlap of the absorption spectrum of the semitransparent color layer is designed such that a reflection band of the optically variable layer at the first viewing angle is masked out by the semitransparent color layer. A security element according to claim 3, wherein the security element (i) at the second viewing angle in the particular area on the one hand, in which the optically variable layer is provided with the semitransparent ink layer, and outside the certain range on the other hand, in which the optically variable layer does not interfere with the semitransparent (Ii) at the first viewing angle in the particular range on the one hand, in which the optically variable layer is provided with the semi-transparent ink layer, and outside the certain range, on the other hand, in which the optically variable layer does not coincide with the Semitransparent color layer is provided, gives a different color impression. A security element according to any one of claims 1 to 4, wherein (i) the first viewing angle represents the perpendicular viewing of the security element and the second viewing angle represents the acute angle viewing of the security element, or (ii) the first viewing angle represents the acute angle viewing of the security element and the second viewing angle represents the vertical view of the security element. A security element according to any one of claims 1 to 5, wherein the semi-transparent ink layer is printed on the optically variable layer. The security element according to one of claims 1 to 6, wherein the security element has an embossing lacquer layer which has in particular a relief structure forming a diffractive structure and / or a relief structure forming a micromirror arrangement and is preferably arranged between the carrier substrate and the optically variable layer. The security element according to claim 1, wherein the semitransparent color layer is contained in a protective lacquer, in a primer layer, in an embossing lacquer layer or in a heat seal lacquer layer or the semitransparent color layer forms a protective lacquer, a primer layer, an emboss lacquer layer or a heat seal lacquer layer. A security element according to any one of claims 1 to 7, wherein the semi-transparent ink layer is contained in the embossing lacquer layer. The security element according to claim 9, wherein the embossing lacquer layer has first regions with a low layer thickness and second regions with a high layer thickness and preferably the first regions on the one hand and the second regions on the other hand impart different color impressions at the first viewing angle. A security element according to any one of claims 1 to 10, wherein the semitransparent color layer is in the form of characters, patterns or codes or has recesses in the form of characters, patterns or codes. A security element according to any one of claims 1 to 11, wherein the optically variable layer is formed by a thin-film element with a color shift effect. The security element of claim 12, wherein the thin film element comprises a reflective layer, an absorber layer, and a dielectric spacer layer disposed between the reflective layer and the absorber layer. A security element according to any one of claims 1 to 13, wherein the carrier substrate is transparent. The security element according to one of claims 1 to 14, wherein the semitransparent color layer (i) is arranged above the optically variable layer on the side of the security element remote from the carrier substrate, or (ii) is arranged between the carrier substrate and the optically variable layer, or (iii ) is arranged above the carrier substrate on the side of the security element remote from the optically variable layer. A security element according to any one of claims 1 to 15, wherein the security element is a security thread, a security strip or a patch suitable for application to a value document. Data carrier with a security element according to one of claims 1 to 16. The data carrier of claim 17, wherein the data carrier is a value document, such as a banknote, in particular a paper banknote, polymer banknote or composite film banknote, or identity card.

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