Security element

Abstract

The invention relates to a security element comprising: a carrier material which has a first and a second main surface which lie opposite one another; an absorber layer, a dielectric layer and a partially reflecting layer which are arranged on the first main surface; wherein the dielectric layer is arranged between the absorber layer and the partially reflecting layer, and the absorber layer is arranged between the dielectric layer and the carrier material; and a contrast layer which, starting from the partially reflecting layer, the dielectric layer and the absorber layer, lies closest to the absorber layer. Furthermore, the invention relates to a method for producing a security element and to a document of value.

Description

[0001] The invention relates to a security element, a method for manufacturing a security element, and a security document with a security element.

[0002] Valuable documents within the meaning of the invention include, among others, banknotes, shares, bonds, certificates, vouchers, checks, airline tickets, high-quality admission tickets, product security labels, credit or debit cards, but also other documents susceptible to forgery, such as passports, identity cards or other identification documents.

[0003] Valuables, especially banknotes, are typically made from paper substrates, polymer substrates, or combinations of paper and polymer, incorporating special security features such as a security thread embedded at least partially in the paper or a watermark. Additional security features can include so-called window films, security threads, or security tapes that are affixed, laminated, or embedded into the document. Security elements usually consist of a polymer or polymer compositions as the carrier or base material. Typically, these security elements include optically variable security features such as holograms or specific color-shifting effects to enhance counterfeit protection.The particular advantage of optically variable security features is that the security features on these security features cannot be imitated by simply copying them with copiers, as the effects of an optically variable security feature are lost through copying or may even appear only black.

[0004] However, for existing security documents with optically variable security elements exhibiting color shift effects, a disadvantage is that the production of the necessary thin-film elements is very time-consuming and expensive. For a definition and explanation of the function of thin-film elements, reference is made to publications WO 2009 / 149831A2 and WO2011 / 032665A1.

[0005] Furthermore, the integration of additional security features such as so-called negative patterns or negative text in the area of ​​color-shifting effects / thin-film elements is complex and often cannot be produced to a satisfactory quality. For example, integrating negative patterns into an area with a color-shifting effect requires that the layers of the thin-film element responsible for the color-shifting effect be at least partially removed at the points where the negative patterns are to be applied.

[0006] In WO 2006 / 002756 A2, which describes a security element according to the preamble of claim 1, the spacer layer of a thin-film element is formed by a film. The thin-film element can be arranged over a hologram. DE 10 2008 013 167 A1 shows a thin-film element over a partially metallized relief structure.

[0007] It is therefore an object of the present invention to provide a method which makes it possible to produce security elements with optically variable effects with less time and cost.

[0008] It is also an object of the present invention to provide a method that enables the high-quality production of security elements with optically variable effects and additional negative patterns. These objects are achieved by the subject matter of the independent claims. Preferred embodiments are defined in the dependent claims.

[0009] A first aspect of the invention relates to a safety element comprising: a substrate material having a first and a second main surface facing each other; an absorber layer, a dielectric layer, and a semi-reflective layer arranged on the first main surface; wherein the dielectric layer is arranged between the absorber layer and the semi-reflective layer, and the absorber layer is arranged between the dielectric layer and the substrate material; and a contrast layer located closest to the absorber layer, starting from the semi-reflective layer, the dielectric layer, and the absorber layer. The sequence of layers—the semi-reflective layer, the dielectric layer, and the absorber layer—forms a thin-film structure with a color-shifting effect. The substrate material is arranged between the contrast layer and the absorber layer.The contrast layer is a layer of dark printing ink or a dark resist varnish.

[0010] The substrate material can have one or more areas to be coated, in which the absorber layer, the dielectric layer, and the partially reflective layer are arranged. The substrate material is preferably a film-like material. The at least one area to be coated is preferably arranged on a main surface of the substrate material. If the substrate material has several areas to be coated, these can be arranged on only one of the two main surfaces or on both main surfaces of the substrate material. In particular, an area to be coated can be a thin-film element area or a color-shift area.

[0011] The area of ​​the substrate material to be coated can have various surface shapes. For example, the area to be coated can be rectangular, oval, star-shaped, or serpentine. The shape and size of the area to be coated are preferably defined or determined in a process layer. The area of ​​the substrate material to be coated can have a surface structure and / or surface finish that differs from other areas of the substrate material. In other words, the substrate material has an area that is defined as the area to be coated. Preferably, the absorber layer, the dielectric layer, and the semi-reflective layer are arranged or applied across the entire surface of the area to be coated. The absorber layer, the dielectric layer, and the semi-reflective layer can, for example, be applied or vapor-deposited by physical vapor deposition.In particular, the safety element can have a relief structure. Preferably, this relief structure can be provided on the first main surface of the carrier medium. For example, the relief structure can be provided by means of an embossed coating layer applied to the first main surface of the carrier medium. Furthermore, the relief structure can be provided in the dielectric layer, so that the dielectric layer does not have a constant thickness.

[0012] The security element can be designed as a so-called T-patch or T-lead, in which the carrier medium is removed before being applied to a document substrate. Alternatively, the security element can be designed as a so-called L-patch or L-lead, in which the carrier medium is bonded to the document substrate. This means the carrier medium is not removed from the security element.

[0013] The layer sequence consisting of a partially reflective layer, a dielectric layer and an absorber layer, wherein the dielectric layer is arranged between the partially reflective layer and the absorber layer, forms a thin-film structure with a color-shifting effect or a thin-film element with a color-shifting effect.

[0014] Advantageously, the safety element has a protective layer that is arranged in the (entire) area to be coated. Preferably, the protective layer is arranged on / at the partially reflective layer.

[0015] Preferably, the protective layer comprises a protective lacquer. Alternatively or additionally, the protective layer comprises a heat-seal lacquer and / or a primer.

[0016] Preferably, the carrier material comprises a carrier film. Particularly preferably, the carrier material comprises polyethylene terephthalate (PET) and / or polypropylene (PP); a carrier material made of PET or PP is especially preferred.

[0017] A security element according to this invention can, in particular, comprise a film or a multilayer substrate, wherein the multilayer substrate can also comprise a combination of fabric substrates and films. For example, the security element can include a window area that serves to fill or bridge a hole in a valuable document or in the paper substrate of the valuable document. In other words, a security window can be incorporated into a valuable document using the security element. Preferably, the area to be coated is located in the window area of ​​the security element. Alternatively, the security element can be applied to a valuable document, for example, by laminating or gluing. The security element can be a security thread or tape, window thread, patch, or the like.

[0018] Advantageously, by using a partially reflective layer in combination with a contrast layer, the thin-film element—that is, the partially reflective layer, the dielectric layer, and the absorber layer—can be made opaque in the areas with the contrast layer, while the thin-film element is semi-transparent in the areas without the contrast layer. Consequently, additional information can be incorporated into the security element very easily and quickly by structuring the contrast layer.

[0019] Preferably, the contrast layer is a structured layer, i.e., a structured contrast layer.

[0020] In particular, a structured contrast layer means that the contrast layer forms a pattern or motif that is visible to an observer when viewing the security element.

[0021] A structured contrast layer means, in particular, that the contrast layer is not uniformly or completely applied to / over the absorber layer or the substrate. Rather, due to the structured contrast layer, there are areas / sub-areas within the area to be coated where the contrast layer is omitted.

[0022] After the structured contrast layer has been applied, two different areas or sections are present in the area to be coated, namely The first areas / sections comprise the substrate material, the semi-reflective layer, the dielectric layer, the absorber layer, and the (structured) contrast layer, while the second areas / sections comprise the substrate material, the semi-reflective layer, the dielectric layer, and the absorber layer, but no (structured) contrast layer. In other words, in this case, the absorber layer is only partially covered by the structured contrast layer, or they are only superimposed in certain sub-areas of the area to be coated.

[0023] Preferably, the structured contrast layer forms a predetermined motif or pattern, such as a character, a string of characters, and / or an image. This motif or pattern determines the structure of the structured contrast layer. The motif can, for example, be visible or recognizable to an observer when viewing the security element through the surface, looking in the direction of the principal surface normals or perpendicular to the first principal surface of the substrate material that contains the area to be coated.

[0024] Preferably, the contrast layer is a layer of dark printing ink. Alternatively, the contrast layer is a layer of dark resist varnish.

[0025] Preferably, the structured contrast layer is arranged / applied in the form of a motif using printing techniques.

[0026] Preferably, the structured contrast layer is applied using one or more rollers and / or cylinders. The number of rollers can vary. Depending on their relative speed, the rollers / cylinders can transport varnish and / or ink. The design is preferably applied or printed using a relief printing plate.

[0027] Preferably, the structured contrast layer is applied using flexographic printing. Alternatively or additionally, the structured contrast layer is applied using gravure printing. Alternatively or additionally, the structured contrast layer is applied using inkjet printing. Alternatively or additionally, the structured contrast layer is applied using offset printing. Alternatively or additionally, the structured contrast layer is applied using screen printing.

[0028] Furthermore, the contrast layer preferably has a thickness of 1 µm to 15 µm, preferably 2 µm to 4 µm. Preferably, the thickness of the contrast layer is constant.

[0029] Preferably, the safety element comprises an additional layer arranged between the absorber layer and the contrast layer.

[0030] Preferably, the additional layer is a structured layer, i.e., an additional, structured layer, for example in the form of a pattern or motif. Preferably, the additional layer has a constant thickness. The thickness of the additional layer is preferably in the range of 1 µm to 15 µm, more preferably in the range of 1 µm to 5 µm and / or 5 µm to 10 µm and / or 10 µm to 15 µm.

[0031] The additional layer preferably comprises a magnetic printing ink, a fluorescent print, or a machine-readable print. The additional layer also preferably comprises infrared-visible and / or thermochromic printing inks.

[0032] Preferably, the partially reflective layer has a layer thickness of 50 (5 nm) to 500 (50 nm) (Angstrom), preferably 100 Ø (10 nm) to 300 Ø (30 nm). Furthermore, the thickness of the partially reflective layer is preferably constant. Preferably, the partially reflective layer is a metallic layer, preferably made of aluminum or an aluminum alloy.

[0033] Preferably, the absorber layer has a thickness of 30 × (0.3 nm) to 200 × (20 nm), preferably 50 × (5 nm) to 100 × (10 nm). Furthermore, preferably the thickness of the absorber layer is constant. Preferably, the absorber layer is a metallic layer, preferably made of chromium.

[0034] Preferably, the dielectric layer has an optical thickness of two quarter wavelengths (λ / 2) relative to a wavelength of 400 nm (2 Quarter Wave Optical Thickness, 2 QWOT) to nine quarter wavelengths (9 λ / 4) relative to a wavelength of 700 nm; more preferably, the layer thickness is between 2 QWOT (2 λ / 4) and 8 QWOT (8 λ / 4) relative to a wavelength between 400 nm and 700 nm. Preferably, the dielectric layer is transparent or translucent in the visible range.

[0035] Preferably, the thickness of the dielectric layer is a constant thickness.

[0036] Preferably, the safety element has a reflective layer that is arranged on the side of the contrast layer facing away from the absorber layer.

[0037] Preferably, the reflective layer is a structured reflective layer. Furthermore, preferably, the reflective layer and the contrast layer are identical or have essentially the same structure. In other words, the reflective layer and the contrast layer have congruent areas that are free of both the reflective layer and the contrast layer.

[0038] Preferably, the contrast layer is arranged between the absorber layer and the substrate material.

[0039] Preferably, the contrast layer is arranged on the second main surface of the substrate material.

[0040] Another aspect concerns a process for manufacturing a safety element, encompassing the following steps: Providing a substrate material with a first and a second principal surface facing each other; arranging an absorber layer, a dielectric layer, and a semi-reflective layer on the first principal surface, wherein the dielectric layer is arranged between the absorber layer and the semi-reflective layer, and the absorber layer is arranged between the dielectric layer and the substrate material; arranging a contrast layer closest to the absorber layer, starting from the semi-reflective layer, the dielectric layer, and the absorber layer. wherein the carrier material is arranged between the contrast layer and the absorber layer, wherein the layer sequence of the semi-reflective layer, the dielectric layer and the absorber layer forms a thin-film structure with a color-shifting effect, and wherein the contrast layer is a layer of dark printing ink or of a dark resist varnish.

[0041] The procedure includes, in particular, suitable process steps to manufacture a safety element with one or more of the aspects or properties described above.

[0042] Preferably, the contrast layer is a structured layer.

[0043] Preferably, the contrast layer comprises a layer of dark printing ink. Alternatively or additionally, the contrast layer comprises a layer of dark resist varnish.

[0044] Another aspect concerns a security document, in particular a banknote, with a security document substrate and at least one security element, which includes one or more of the aspects described above.

[0045] A security feature is preferably applied to or embedded in a document substrate. A document substrate can be paper, polymer, or a paper-polymer combination. In the case of a banknote made of polymer or a paper-polymer combination as the document substrate, the carrier material of the security feature can be a portion of the document substrate. For example, the document substrate can be a polymer film, and the carrier material of the security feature is a portion of this polymer film.

[0046] If the security element is embedded in a security document, the top and bottom surfaces of the security element preferably run (essentially) parallel to the top and bottom surfaces of the security document substrate. The top and bottom surfaces of the security document, as well as those of the security element, can also be referred to as primary surfaces. These primary surfaces convey relevant information to an observer. Consequently, the primary surfaces are visible to an observer viewing a security document containing a security element. For example, a primary surface of a banknote might display the banknote's value and its serial number. Similarly, the top and bottom surfaces of a security element, like those of a security document, can also be considered the first and second primary surfaces.

[0047] The invention is explained below with reference to preferred embodiments in conjunction with the accompanying figures, in the representation of which a scale and proportion accuracy has been omitted in order to increase clarity.

[0048] They show: Fig. 1a, 1 a schematic representation of a security document with a security element; Fig. 2 a schematic sectional view of a security element according to one variant; Fig. 3 a schematic sectional view of a security element according to another variant; Fig. 4 a schematic sectional view of a security element according to another variant; Fig. 5 a schematic sectional view of a security element according to another variant;

[0049] Figures 1a and 1bEach figure shows a schematic top view of a main surface of a security document 100 with a security document substrate 102 and a security element 104, wherein the security element 104 is firmly connected to the security document substrate 102, e.g., embedded in or applied to the security document substrate 102. The security element 104 can also be a partial area of ​​the security document substrate 102. The security element 104 has an area defined as the area to be coated 106. The area to be coated 106 is preferably a color-shift or thin-film element area comprising a partially reflective layer, an absorber layer, and a dielectric layer. The area to be coated 106 has a contrast-layer-free area 108 and a contrast-layer area 110.

[0050] Figure 1a The contrast layer-free area 108a shows the number 45. Figure 1bThe contrast-layer-free area 108b shows three stripes. A contrast-layer-free area can furthermore have any shape or configuration. For example, a contrast-layer-free area could have the shape of a church or an animal. Preferably, a contrast-layer-free area allows an observer to recognize the contrast-layer-free area from above and / or from behind. Preferably, the security element in the contrast-layer-free area is more transparent than in the contrast-layer area, or at least semi-transparent, so that at least some of the light incident on the security element is transmitted in the contrast-layer-free area. The security element 104 comprises a carrier material, which preferably consists of polyethylene terephthalate (PET), and has an area 106 to be coated. The contrast-layer area 110, which is a sub-area orThe area 106 to be coated comprises at least one partially reflective layer, one dielectric layer, and at least one absorber layer. The contrast-layer-free area 108, in contrast to the contrast-layer area 110, lacks a contrast layer. Accordingly, it is clearly evident that the contrast layer is not present across the entire surface or uniformly within the area 106 to be coated, but only / exclusively within the contrast-layer area 110. In other words, the contrast layer is a structured contrast layer.

[0051] The structure of a coating area 108 with contrast layer area 110 and contrast layer-free area 108 is described below with the aid of the Figures 2 to 5 explained in more detail.

[0052] Fig. 2Figure 1 shows a sectional view of a safety element 200 with a substrate material 201. The substrate material 201 has a first main surface HF1a and a second main surface HF2a. An absorber layer 202 is arranged on the main surface HF1a of the substrate material. A dielectric layer 203 is arranged on the absorber layer 202. A partially reflective layer 204 is arranged on the dielectric layer 203. A structured contrast layer 205 is arranged on the second main surface HF2a of the substrate material 201. The structuring of the contrast layer 205 creates contrast-layer-free areas 206. In particular, the area 206 can be further enhanced by the structuring of the contrast layer 205. Fig. 2 The sectional view shown is a section through the "4" along line II according to Fig. 1a or a part along line II-II according to Fig. 1b are equivalent to.

[0053] Fig. 3shows a safety element 300, which has a (first) carrier material 301a with a first main surface HF1a and a second main surface HF2a. This sectional view can, for example, be a part of a sectional view along line II, as in Fig. 1a shown, or along section line II-II according to Fig. 1b are equivalent to. Fig. 3Figure 300 shows a partially reflective layer 304, a dielectric layer 303, and an absorber layer 302. These three layers 304, 303, and 302 are arranged on the first main surface HF1a of the (first) substrate material 301a. The security element 300 also has a second substrate material 301b, which has a first main surface HF1b. A structured contrast layer 305 is arranged on the first main surface HF1b, resulting in contrast-layer-free areas 306. Furthermore, the security element 300 has an additional structured layer 308. The additional structured layer 308 can, for example, be a layer of magnetic printing ink. The security element 300 is formed by joining the (first) substrate material 301a and the (second) substrate material 301b. Preferably, the (first) support material 301a and the (second) support material 301b are joined together after the arrangement of the layers 308 and 305.For example, the carrier materials 301a and 301b can be joined together by an adhesive layer 307. This results in a structure in which the additional structured layer 308 and the structured contrast layer 305 are arranged on / at the second main surface HF2a of the (first) carrier material 301a.

[0054] Fig. 4Figure 1 shows a sectional view of a safety element 400 with a substrate material 401a. The (first) substrate material 401a has a first main surface HF1a and a second main surface HF2a. A contrast layer 405, which can be a structured contrast layer with contrast-free areas 406, is arranged on or against the first main surface HF1a. An additional structured layer 408 is arranged on or against the contrast layer 405. An absorber layer 402, a dielectric layer 403, and a partially reflective layer 404 are arranged above or against the additional structured layer 408. A (second) substrate material 401b is arranged on or above the partially reflective layer 404. For example, in the manufacture of the security element 400, the first main surface HF1a of the (first) carrier material 401a can be coated with the contrast layer 405 and the additional layer 408.In a further step, the second main surface HF2b of the (second) carrier material 401b can be coated with layers 404, 403, and 402. In a further step, the second main surface HF2b of the (second) carrier material 401b and the first main surface HF1a of the (first) carrier material 401a can then be bonded together. For example, an adhesive layer 407 can be used for this purpose.

[0055] Figure 5Figure 1 shows a schematic sectional view of a safety element 500 with a substrate material 501a. The (first) substrate material 501a has a first main surface HF1a and a second main surface HF2a. An absorber layer 502, a dielectric layer 503, and a partially reflective layer 504 are arranged on or attached to the first main surface HF1a. An additional layer 508 and a contrast layer 505 are arranged on the second main surface HF2b of the (first) substrate material 501a. Furthermore, a reflective layer 507 is arranged on the contrast layer 505. This reflective layer 507 can be produced by printing or vapor deposition. A (second) substrate material 501b is arranged on the reflective layer 507. The reflective layer 507 and the contrast layer 505 preferably have the same structure. Thus, contrast layer-free areas 506 are also reflection layer-free areas.In the production of the security element 500, for example, the first main surface HF1a of the (first) carrier material 501a can be coated with layers 502, 503, and 504. In a further step, the first main surface HF2a of the (second) carrier material 501b can be coated with the additional layer 508, the contrast layer 505, and the reflective layer 507. In a further step, the first main surface HF1b of the (second) carrier material 501b and the second main surface HF2a of the (first) carrier material 501a can then be bonded together. For example, an adhesive layer 509 can be used for this purpose.

[0056] Advantageously, when viewing the safety elements 200, 300, 400 and 500 in reflected light, a viewer can perceive a homogeneous color shift effect in the area 106 to be coated, whereas, advantageously, when viewing in transmitted light, the viewer can perceive the contrast layer-free areas 206, 306, 406 and 506 in the form of patterns, symbols or motifs. Reference symbol list

[0057] 100 Valuable document 102 Valuable document substrate 104 Security element 106 Area to be coated 108 Contrast layer-free area 110 Contrast layer area 200, 300, 400, 500 Security element 201, 301a, 401a, 501a (first) carrier material 301b, 401b, 501b (second) carrier material 202, 302, 402, 502 Absorber layer 203, 303, 403, 503 Dielectric layer 204, 304, 404, 504 Partially reflective layer 205, 305, 405, 505 Contrast layer 206, 306, 406, 506 Contrast layer-free area 308, 408, 508 Additional layer HF1a, HF1b 1. Main area of ​​the (first or second) carrier material HF2a, HF2b 2. Main area of ​​the (first or second) carrier material

Claims

1. A security element (200; 300; 500) comprising: a carrier material (201; 301a; 501a) which has a first and a second principal face which oppose each other, an absorber layer (202; 302; 502), a dielectric layer (203; 303; 503) and a partially reflecting layer (204; 304; 504) which are arranged on the first principal face, wherein the dielectric layer (203; 303; 503) is arranged between the absorber layer (202; 302; 502) and the partially reflecting layer (204; 304; 504), and the absorber layer (202; 302; 502) is arranged between the dielectric layer (203; 303; 503) and the carrier material (201; 301a; 501a); and a contrast layer (205; 305; 505) which lies nearest the absorber layer (202; 302; 502) starting out from the partially reflecting layer (204; 304; 504), the dielectric layer (203; 303; 503) and the absorber layer (202; 302; 502); wherein the carrier material (201; 301a; 501a) is arranged between the contrast layer (205; 305; 505) and the absorber layer (202; 302; 502); wherein the sequence of layers consisting of the partially reflecting layer (204; 304; 504), the dielectric layer (203; 303; 503) and the absorber layer (202; 302; 502) forms a thin-layer construction having a colour shift effect; and wherein the contrast layer (205; 305; 505) is a layer of dark printing ink or of a dark resist lacquer.

2. The security element according to claim 1, wherein the contrast layer (205; 305; 505) is a structured layer; and / or the contrast layer (205; 305; 505) has a layer thickness of 1 µm to 15 µm, preferably 2 µm to 4 µm.

3. The security element according to either of claims 1 or 2, wherein an additional layer (308, 508) is arranged between the absorber layer (202; 302; 502) and the contrast layer (205; 305; 505), wherein the additional layer is preferably a structured layer and preferably has a (constant) layer thickness of 1 µm to 15 µm.

4. The security element according to one or several of claims 1 to 3, wherein the partially reflecting layer (204; 304; 504) has a layer thickness of 5 nm to 50 nm, preferably 10 nm to 30 nm, and is preferably a metallic layer.

5. The security element according to one or several of claims 1 to 4, wherein the absorber layer (202; 302; 502) has a layer thickness of 0.3 nm to 20 nm, preferably 5 nm to 10 nm, and is preferably a metallic layer.

6. The security element according to one or several of claims 1 to 5, wherein the dielectric layer (203; 303; 503) has an optical thickness of two quarter wavelengths in relation to a wavelength of 400 nm to nine quarter wavelengths in relation to a wavelength of 700 nm, preferably between two to eight quarter wavelengths in relation to a wavelength between 400 nm and 700 nm, and is preferably a transparent or translucent layer in the visible range.

7. The security element according to one or several of claims 1 to 6, wherein a reflective layer (507) is arranged on the side of the contrast layer (205; 305; 505) facing away from the absorber layer (202; 302; 502).

8. The security element according to one or several of claims 1 to 7, wherein the contrast layer (205) is arranged on the second principal face of the carrier material (201).

9. The security element according to one or several of claims 1 to 7, wherein the security element (200; 300; 500) comprises a second carrier material (301b; 501b), wherein the contrast layer (305; 505) is arranged between the first carrier material (201; 301a; 501a) and the second carrier material (301b; 501b).

10. The security element according to claim 9, wherein the contrast layer (305) is arranged on a first principal face of the second carrier material (301b) or a reflective layer (507) is arranged on the first principal face of the second carrier material (501b) and the contrast layer (505) is arranged on the reflective layer (507).

11. A method for manufacturing a security element, comprising the steps of: - supplying a carrier material (201; 301a; 501a) with a first and a second principal face which oppose each other, - arranging an absorber layer (202; 302; 502), a dielectric layer (203; 303; 503) and a partially reflecting layer (204; 304; 504) on the first principal face; wherein the dielectric layer (203; 303; 503) is arranged between the absorber layer (202; 302; 502) and the partially reflecting layer, and the absorber layer (202; 302; 502) is arranged between the dielectric layer (203; 303; 503) and the carrier material (201; 301a; 501a) ; - arranging a contrast layer which lies nearest the absorber layer (202; 302; 502) starting out from the partially reflecting layer (204; 304; 504), the dielectric layer (203; 303; 503) and the absorber layer (202; 302; 502); wherein the carrier material (201; 301a; 501a) is arranged between the contrast layer (205; 305; 505) and the absorber layer (202; 302; 502), wherein the sequence of layers consisting of the partially reflecting layer (204; 304; 504), the dielectric layer (203; 303; 503) and the absorber layer (202; 302; 502) forms a thin-layer construction having a colour shift effect, and wherein the contrast layer (205; 305; 505) is a layer of dark printing ink or of a dark resist lacquer.

12. The method according to claim 11, wherein the contrast layer (205; 305; 505) is a structured layer.

13. The method according to claim 11 for manufacturing a security element according to any of claims 2 to 10.

14. A value document (100), in particular a banknote, with a value document substrate and at least one security element (200; 300; 500) according to one or several of claims 1 to 10.

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