EP2542421B1 - Security element having aligned magnetic pigments - Google Patents

Description

The invention relates to a security element for security papers, documents of value and other data carriers, with a color layer with magnetically oriented magnetic pigments forming a motif in the form of patterns, characters or a coding, which shows a dynamic movement effect when tilting the security element. The invention further relates to a method for producing such a security element, a security paper and a data carrier with such a security element.

Data carriers, such as valuables or identity documents, but also other valuables, such as branded goods, are often provided with security elements for the purpose of security, which permit verification of the authenticity of the data carrier and at the same time serve as protection against unauthorized reproduction. The security elements can be embodied, 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 printed directly on 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. Magnetically alignable effect pigments which are magnetically aligned in the form of a motif to be displayed, for example in the publication, have also been used for this purpose for some time WO 2009/033601 A1 described.

An optically variable security element with a color layer, the first, optically variable effect pigments for generating a viewing angle-dependent contains visual impression and second, by an external magnetic field reversibly alignable effect pigments is from the document WO 2009/074284 A2 , which discloses the preamble of claim 1, known. The color layer may also contain third magnetically aligned and fixed in their orientation effect pigments.

Proceeding from this, the present invention seeks to provide a security element of the type mentioned, which is a high counterfeit security with good recognizability and easy verifiability.

This object is achieved by the security element having the features of the main claim. A method for producing such a security element and a data carrier with such a security element are specified in the independent claims. Further developments of the invention are the subject of the dependent claims.

According to the invention, in a generic security element, the first dynamic motif of the magnetically aligned magnetic pigments is combined with a second, static motif generated by the action of laser radiation in the form of patterns, characters or a coding whose fixed outline, when viewed, forms a fixed reference point for the magnet dynamic motive forms.

By combining a static and a dynamic subject, the attention and recognition value of the security element is significantly increased. As described in more detail below, the static motif provides a fixed reference point for the motion effects of the dynamic subject, thereby making it easier for a viewer to see and visually more conspicuous.

In the authenticity check of the security element, the combination of static and dynamic motif is easy to remember and their presence or absence can be easily determined even without tools, so that the relevant security features can be easily and reliably detected and verified by the viewer. The creation of the static motif by means of laser exposure also allows special pass effects and To provide color matching features that can not be practically produced by other methods. Specific examples of such effects and features are given and explained below.

In a preferred embodiment, the magnetic pigments are non-spherical, in particular platelet-shaped. The magnetic pigments can be colored and / or optically variable and, in the latter case, in particular contain color-shifting thin-film elements with an interference layer structure.

The magnetic pigments can be formed, for example, on the basis of high-purity iron powder and, in particular, be prepared from reducing-treated carbonyl iron powder. Advantageous platelet-shaped iron pigments can in particular the document EP 1 251 152 B1 are taken from the disclosure of the preparation and properties of such pigments in the present description. The magnetic pigments may also be, for example, wet-chemically produced multilayer pigments or magnetic interference pigments, as described in US Pat EP 1 366 380 A2 are also included in the present description, the disclosure of the preparation and properties of such pigments.

In a preferred embodiment, the magnetic pigments are present as a mixture of different, preferably platelet-shaped, magnetic pigments.

The ratio of the largest to the smallest diameter of platelet-shaped magnetic pigments is advantageously more than 5: 1, preferably more than 10: 1. This ratio is particularly preferably between 40: 1 and 400: 1. The largest diameter of the platelet-shaped magnetic pigments is advantageous more than 2 microns, preferably more than 5 microns, more preferably more than 10 microns and most preferably more than 15 microns. Platelet-shaped magnetic pigments, in particular in the preferred size range and in the preferred diameter-to-thickness range, can be oriented as desired by an external magnetic field relative to the layer plane of the color layer. With high diameter-to-thickness ratios, high contrasts between translucent and opaque layer areas can be set.

The aligned platelet-shaped magnetic pigments form an effective, three-dimensional appearance for the human eye, which in the context of this description is also referred to as a 3D effect or 3D impression of the motif. The three-dimensional appearance is associated with a dynamic movement effect, in which the position of the generated motif seems to move when tilting the security element or when changing the viewing or lighting direction.

In a preferred embodiment, the preferably platelet-shaped magnetic pigments are aligned in the form of a centrosymmetric marking, which advantageously contains in its interior a substantially uniformly aligned region with a diameter of 5 mm or more. With particular advantage, the platelet-shaped magnetic pigments are aligned substantially perpendicular to the surface of the ink layer inside the centrosymmetric marking, and are aligned outside the marking with a sharp transition substantially parallel to the surface of the ink layer.

In a preferred variant, the magnetic pigments are aligned by exactly one spherical magnet in the form of the first motif.

In another, likewise advantageous variant of the invention, the magnetic pigments are aligned by a plurality of spaced-apart spherical magnets in the form of the first motif. The plurality of ball magnets can be in direct contact with each other during the alignment step or separated from each other by spacers. The ball magnets can be arranged with such a large distance that their magnetic fields do not influence each other practically. However, it is also possible to use the superimposition of the magnetic fields of the individual spheres specifically to produce attractive orientations. In all variants simultaneously ball magnets of different diameters can be used.

Another way to specifically control the orientation of the magnetic pigments, is to adjust the distance of the ball magnet or the ball magnets to the color layer of the security element suitable. The smaller this distance, the greater the selectivity from oriented to non-oriented areas. The most pronounced 3D effect, on the other hand, is achieved at slightly greater distances. When aligning a plurality of spherical magnets can be arranged at different distances to the ink layer and thus create motifs with different degrees of expression of the 3D effect and different selectivity.

In a further preferred embodiment, the preferably platelet-shaped magnetic pigments are aligned in the form of a marking having two regions in which the magnetic pigments are aligned substantially parallel to two planes pointing in different directions, preferably with a sharp transition between the regions. According to another preferred embodiment, the orientation of the preferably platelet-shaped magnetic pigments is in the form of a marking which contains a region in which the magnetic pigments are aligned in an arc relative to the surface of the ink layer. Such markings can in particular the document WO 2004/007095 A2 are taken from the disclosure of the production and properties of such markings in the present description.

In an advantageous variant of the invention, the second, static motif is arranged completely within the color layer with the aligned magnetic pigments.

In another variant of the invention, which is likewise advantageous, the second static motif in the register is partly arranged inside and partly outside the color layer with the oriented magnetic pigments. The continuation of the second motif outside the color layer with perfect registration "sews" the ink layer, as it were, with the surrounding substrate, thereby creating a particularly difficult to reproduce design with high security against counterfeiting. In this variant of the invention, the second static motif may also extend over a recess in the color layer, which likewise represents an area outside the color layer.

According to a variant not claimed, the optical properties, in particular the color or the optical variability of the magnetic pigments, are altered in the region of the second, static motif, the alignment of the magnetic pigments, however, being preserved. Such a change in the optical properties will hereinafter be referred to as "orientation-preserving modification" of the magnetic pigments. The orientation-preserving modification in particular leaves the dynamic light-dark effects of the first dynamic motif unchanged, so that the impression of a fixed level is created above the first motif through which the first motif shines through.

According to the invention, the orientation of the magnetic pigments in the area of the second, static motif is destroyed or the magnetic pigments are removed from the color layer in the area of the second, static motif. The second, static motif then shows no movement effect when viewed. In the event that a mixture of different magnetic pigments is present, one or more components of the mixture may be altered. In particular, the orientation of one or more components of this mixture may be destroyed in the region of the second, static motif, or one or more components of the mixture are removed from the color layer in the region of the second, static motif.

The second motif may also contain two partial regions which were generated with different laser parameters, wherein the magnetic pigments were modified to preserve orientation in one partial region and were destroyed or removed in the other partial region. Since the sections are created with the same laser beam in the same operation, they are in perfect register with each other.

The ink layer is preferably formed by a screen printing layer. In order to enable the fixation of the oriented magnetic pigments, the color layer with the magnetic pigments is expediently formed on the basis of a UV-curing color system, pure UV systems, UV / water-based systems or even UV / solvent-based systems being considered.

In addition to the magnetically oriented magnetic pigments, the color layer may also contain dyes, luminescent substances or further pigments, in particular colored pigments, luminescent or optically variable pigments, for example pigments prepared on the basis of liquid-crystalline polymers or iridescent pearlescent pigments, as described, for example, by Merck KGaA under the name Iriodin (R) are sold.

The color layer can also be arranged on a background layer which is colored or optically variable. In particular, the background layer may have a colored or optically variable further identification. Such further identification can also interact visually with the first and / or second motif.

The security element according to the invention can be further equipped with one or more protective layers for use as a security element for security papers, value documents and other data carriers, eg. with a transparent protective varnish.

• auf ein Substrat mindestens eine Farbschicht mit magnetisch ausrichtbaren Magnetpigmenten aufgebracht wird,
• die Magnetpigmente magnetisch in Form von Mustern, Zeichen oder einer Codierung ausgerichtet und in ihrer Ausrichtung fixiert werden, wodurch ein erstes Motiv mit einem dynamischen Bewegungseffekt erzeugt wird, und
• durch Laserbeaufschlagung in der mindestens einen Farbschicht ein zweites, statisches Motiv in Form von Mustern, Zeichen oder einer Codierung erzeugt wird, dessen ortsfester Umriss einen ortsfesten Bezugspunkt für das erste Motiv bildet, wobei im Bereich des zweiten, statischen Motivs die Ausrichtung der Magnetpigmente zerstört wird oder die Magnetpigmente im Bereich des zweiten, statischen Motivs aus der Farbschicht entfernt werden.

The invention also includes a method for producing a security element for securing security papers, value documents and other data carriers, in which

• at least one color layer with magnetically orientable magnetic pigments is applied to a substrate,
• the magnetic pigments are magnetically aligned in the form of patterns, characters or a coding and fixed in their orientation, whereby a first motive with a dynamic movement effect is generated, and
• by laser application in the at least one color layer, a second, static motif in the form of patterns, characters or a coding is generated whose stationary outline forms a fixed reference point for the first motif, wherein in the region of the second, static motif, the orientation of the magnetic pigments is destroyed or the magnetic pigments in the region of the second, static motif are removed from the ink layer.

In a preferred variant of the method, a color layer based on a UV-curing color system is used, and the aligned magnetic pigments are fixed by UV curing of the color layer. The ink layer is preferably printed by screen printing, even if in principle other printing processes, such as flexographic printing or intaglio printing come into question.

It is advisable to carry out the laser application for generating the second motif with a pulsed infrared laser in the wavelength range from 0.8 μm to 3 μm, for example an Nd: YAG laser. The laser application is preferably carried out with short pulse durations of 20 ns or less, particularly preferably 12 ns or less.

Finally, the invention also includes a data carrier with a security element of the type described, wherein the security element can be arranged both in an opaque region of the data carrier and in or over a transparent window region or a through opening of the data carrier. In particular, the data carrier can be a value document, such as a banknote, in particular a paper banknote, a polymer banknote or a foil-paper composite banknote, or an identity card, such as a credit card, a bankcard, a cashcard, an authorization card, a banknote Identity card or a pass personalization page.

In all embodiments, the first and / or second motif, for example, represent a numbering, in particular as a replacement or supplement to a Buchdruckzifferung, about on banknotes. The first and / or second motif may also consist of numbers and letters derived from a digit, for example, numerals or letters calculated from standard-numbered cryptographic methods, or from a repetition of parts of a standard-numbering. The first and / or second motif may further consist of a value number, for example the denomination of a banknote, as in Fig. 7 may display a logo, such as a central bank publisher logo or anniversary commemorative event, may represent a date and / or time, or derived information such as a batch code, may represent a graphical element such as in Fig. 2 or may represent a code such as a bar code, matrix code, or a multi-color code.

In particular, either the magnetic pigment or, in the case of a mixture of different magnetic pigments, a particular magnetic pigment or the color layer can be blackened by the laser application or the substrate or a background layer below the color layer. Also, blending effects are possible, for example, a silver marking of the color layer and a blackening of the underlying substrate. The blackening may appear, depending on the thermal behavior of the substrate, as a finer or thicker mark than the marking of the color layer.

Especially when using the security element in the case of cards, one or more substrate layers may also be provided above the color layer. The layers above the color layer may be laser-markable, whereby here also different line widths can result. These cover layers can also be patterned to produce additional tilting effects, for example by a grid of cylindrical lenses. In embodiments in which one or more substrate layers are present below the ink layer, they can be blackened and / or tactilely marked in particular.

Substantially opaque printed layers can also be arranged above the color layer. These can, when they react with the laser radiation, be blackened or removed by the laser marking, for example to produce matt-gloss effects. At the same time the color layer can be marked orientation preserving. If the overpressure is transparent to the laser radiation, it can serve as a protective layer.

In an advantageous design alignment, color impression and laser marks disappear when viewed in review. The laser marking can also remove the color, so that at the marked points the transparency is improved. Such security elements can be used in transparent substrates or in transparent window areas of a data carrier. A transparent area may also represent only a partial area within a more complex structure, and / or may be combined with blackening of color layers or substrate layers.

• Komplexe Herstellung: die Bedruckstoffe, Farben und Markierungswerkzeuge sind nicht ohne Weiteres auf dem freien Markt verfügbar;
• Gute Erkennbarkeit der relevanten Sicherheitseffekte ohne Hilfsmittel;
• Erhöhung des Anteils der Wertschöpfung in der Druckerei, da durch die Lasermarkierung ein zusätzlicher Designeffekt mit deutlich erhöhter Sicherheit erreicht wird; und
• Erhöhung der Sicherheit des Datenträgers durch Kombinationseffekte und eine mit anderen Verfahren nicht darstellbare Passgenauigkeit.

Overall, the proposed combination of a static and a dynamic motif in a security element according to the invention offers the following advantages in particular:

• Complex manufacturing: the substrates, colors and marking tools are not readily available on the open market;
• Good visibility of the relevant safety effects without aids;
• Increase the share of added value in the print shop, since the laser marking achieves an additional design effect with significantly increased safety; and
• Increasing the security of the data carrier by combination effects and an accuracy that can not be represented with other methods.

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. The various embodiments are not limited to use in the specific form described, but can also be combined with each other.

Fig. 1

eine schematische Darstellung einer Banknote mit einem erfindungsgemäßen Sicherheitselement,

Fig. 2

eine Aufsicht auf das Sicherheitselement der Fig. 1,

Fig. 3

schematisch die Ausrichtung der noch beweglichen Magnetpigmente eines erfindungsgemäßen Sicherheitselements im Feld eines Kugelmagneten,

Fig. 4

einen Querschnitt durch das Sicherheitselement der Fig. 2 entlang der Linie IV-IV,

Fig. 5

einen Querschnitt durch das Sicherheitselement der Fig. 2 entlang der Linie V-V,

Fig. 6

eine Darstellung wie in Fig. 5 für ein nicht beanspruchtes Ausführungsbeispiel, bei dem die Interferenzschichtpigmente durch die Laserstrahlung orientierungserhaltend modifiziert sind, und

Fig. 7

ein erfindungsgemäßes Sicherheitselement, bei dem das lasergenerierte statische Motiv passergenau in den Umgebungsbereich der Farbschicht weitergeführt ist.

Show it:

Fig. 1

a schematic representation of a banknote with a security element according to the invention,

Fig. 2

a view of the security element of Fig. 1 .

Fig. 3

schematically the orientation of the still movable magnetic pigments of a security element according to the invention in the field of a spherical magnet,

Fig. 4

a cross section through the security element of Fig. 2 along the line IV-IV,

Fig. 5

a cross section through the security element of Fig. 2 along the line VV,

Fig. 6

a representation like in Fig. 5 for a non-claimed embodiment in which the interference layer pigments are modified by the laser radiation preservation, and

Fig. 7

a security element according to the invention, in which the laser-generated static motif is continued in register with the surrounding area of the color layer.

The invention will now be explained using the example of security elements for banknotes. FIG. 1 shows a schematic representation of a banknote 10, with an in Fig. 2 security element 12 shown in more detail is provided with a combined static and dynamic motive.

Regarding Fig. 2 For example, the security element 12 has a color layer 20 with magnetically oriented, platelet-shaped magnetic pigments, which is aligned by a spherical magnet in the form of a sharply demarcated circular marking 22. The circular marker 22 shows a dynamic motion effect, in which the position of the marker 22 on the security element 12 seems to move when the security element is tilted or when the viewing or illumination direction changes, thus forming a dynamic motif.

The dynamic motif 22 is combined with a laser-generated, static motif 28 in the form of two eighth notes, which shows no movement effect, but forms a fixed reference point for the dynamic motif 22 when viewed.

This fixed reference point of the static motif 28, which is integrated into the security element, emphasizes the dynamic movement effect and the three-dimensional appearing appearance of the aligned magnetic pigments, thereby making them even clearer. The immediate proximity of the stationary motif 28 draws the attention of the viewer by the contrast effect on the seemingly moving dynamic motif 22.

The viewer can also easily check the security element 12 for authenticity, since the combination of static and dynamic motif is easy to memorize and its presence can be determined without any aids.

Finally, as explained in more detail below, the generation of the static motif by means of laser radiation can produce special effects in the combination marking which can not or only with difficulty be achieved in other ways.

With reference to the FIGS. 2 to 4 First, the orientation of the magnetic pigments of the ink layer 20 is described in more detail with a spherical magnet. FIG. 4 shows a cross section through the security element of Fig. 2 along the line IV-IV, FIG. 3 schematically shows the alignment of the still movable magnetic pigments 44 in the field of a spherical magnet 30th

The magnetic pigments 44 may be, for example, platelet-shaped iron pigments which are produced from reducing-treated carbonyl iron powder and which can be produced with a high ratio of platelet diameter to platelet thickness. Also suitable are wet-chemically prepared pigments with a support of mica, SiO ₂ or mica and an outer shell of iron oxide (Fe ₃ O ₄ ), which gives the magnetic pigments their magnetic properties. Such pigments are offered for example by Merck KGaA under the name Colorona Blackstar (R). By changing the iron oxide layer thickness, different shades can be achieved (eg green, blue, red). For security printing opaque magnetic pigments with a color shift effect, for example under the name Colorcrypt (R) Magnetic Gold, magnetic interference pigments, as described in the EP 1 366 380 A2 or covering magnetic pigments with a uniform color. For example, a gold-colored magnetically orientable magnetic pigment may comprise Al ₂ O ₃ coated with Fe ₃ O ₄ and MgO.

In the exemplary embodiment, to produce the security element 12 on a substrate 40, a color layer 20 based on a UV-curing color system is applied, which contains the desired magnetically alignable, platelet-shaped magnetic pigments 44. The printing of the ink layer 20 is preferably carried out by screen printing.

Then, the substrate 40 is brought with the still moving in the ink layer 20 magnetic pigments 44 at a small distance over a spherical magnet 30 ( Fig. 3 ). The spherically extending magnetic field lines 32 of the spherical magnet align the magnetic pigments 44 in a defined region 42 essentially perpendicular to the substrate surface, while the preferred orientation the magnetic pigment 44 extends outside the region 42 substantially parallel to the substrate surface. The thus aligned magnetic pigments 44 are permanently fixed in their orientation by curing the UV varnish, as in the cross section of FIG Fig. 4 shown.

In this way, a centrosymmetric, circular marking 22 is formed, which in its interior has a substantially uniformly aligned region 24 (FIG. Fig. 2 ), in which the magnetic pigments are perpendicular to the substrate surface. In a narrow transition region 26, the inner region 24 merges into the surrounding region 21 of the marking, in which the magnetic pigments of the color layer 20 are aligned essentially parallel to their surface.

After the alignment and fixing of the magnetic pigments 44, the color layer 20 is exposed to laser radiation, preferably laser radiation of a pulsed infrared laser with short pulse durations of about 20 ns or less, preferably about 12 ns or less. The laser beam is typically passed over the color layer 20 with a width of a few tenths of a millimeter and a marking speed of a few m / s in the form of the desired static motif 28.

The laser radiation destroys the orientation of the magnetic pigments in the applied areas or the magnetic pigments 44 are even completely removed from the ink layer 20 in the applied areas 28. The latter is in Fig. 5 shown, which is a cross section through the security element of Fig. 2 along the line VV shows. The regions 28 without magnetic pigments therefore no longer take part in the dynamic movement effect of the motif 22, but appear stationary and static.

The visual impression of the color layer 20 is changed in the applied areas 28 against the unimpacted areas of the ink layer, the type of visual change in particular by the design of the ink layer, by the choice of magnetic pigments, by the laser parameters in the application, by a optionally arranged below the color layer 20 background layer or a layer disposed over the color layer 20 cover layer can be adjusted in wide ranges as desired.

For example, in addition to the magnetic pigments 44, the color layer 20 may contain color pigments which are not influenced by the laser radiation and whose color impression after exposure determines the visual impression of the regions 28. The color layer 20 can also be transparent or translucent after removal of the magnetic pigments and release the view of a background layer in the areas 28. Such a background layer can be monochrome or even contain a marking, so that the applied areas 28 at different points of the security element 12 show a different visual impression.

In another embodiment, the alignment of the magnetic pigments is obtained by the laser radiation, however, the optical properties, in particular the color or the optical variability of the magnetic pigments are changed.

FIG. 6 shows in cross-section a representation as in Fig. 5 for an embodiment in which the color layer 20 contains optically variable, magnetic interference layer pigments 52. Due to the laser radiation in the acted areas 50 only one or several layers of the interference layer pigments 52 are removed or destroyed, so that they lose their optically variable properties there and appear as modified pigments 54, for example with a silver-gray color impression.

As a result of the orientation-preserving modification of the optical properties of the magnetic pigments 52, a mixing region is formed in the security element, in which the modified pigments 54 on the one hand have a three-dimensional appearance due to their orientation. On the other hand, due to the stationary outline of the regions 50, static information is introduced into the color layer 20, which serves as a fixed reference point for the dynamic motif 22. In particular, in this case the dynamic light-dark effects of the modified magnetic pigments 54 remain unchanged, so that the impression of a fixed plane over the dynamic motif 22 is created, through which the dynamic motif 22, as it were, shines through.

The orientation-preserving modification of the optical properties of the magnetic pigments 52 can be used as an additional security feature, since the unchanged orientation of the modified pigments 54 can still be viewed and detected visually as well as with suitable auxiliaries by obtaining the light-dark effects.

The security against forgery of security elements according to the invention can also be further increased by the fact that the laser-generated static motif is continued in precise registration in the surrounding area of the color layer 20. FIG. 7 shows a security element 60 with a color layer 20 containing a color mixture of magnetically oriented, optically variable, platelet-shaped magnetic pigments and yellow-green color pigments. In the color layer 20, as related to Fig. 2 described by Orientation with a spherical magnet introduced a circular motive 22 with dynamic movement effect.

Alternatively or in addition to the color pigments, the color mixture may also contain optically variable pigments, in particular interference pigments or liquid crystal pigments. Furthermore, the color mixture may consist of a mixture of different magnetically oriented platelet-shaped magnetic pigments.

The dynamic motif 22 is combined with two laser-generated static motifs 62, 64, which form stationary reference points for the dynamic motif 22. The first static motif 62 forms by its outline the denomination "50" of the banknote 10 and is formed by an area in which the optical properties of the magnetic pigments have been modified to preserve orientation. The numerals of the denomination "50" appear with their stationary outline, for example silvery in front of the color-shifting, yellow-green-primed background of the optically variable magnetic pigments and the yellow-green color pigments of the color layer 20.

The second, linear, static motif 64 extends beyond the boundary of the color layer 20 into the adjoining banknote substrate 70. In the partial region 66 of the motif, which is located within the color layer 20, the magnetic pigments are completely removed from the color layer 20 by the laser application , as in Fig. 5 shown. Of the color mixture then remain only the yellow-green color pigments. The partial regions 66 therefore do not participate in the dynamic movement effect of the motif 22, but rather form a static image information within the color layer 20.

In the partial area 68 of the second motif 64 extending into the banknote substrate 70, a colored and tactile detectable marking is produced in the banknote substrate 70 by the action of the laser radiation. Since the portions 66, 68 are formed inside and outside the ink layer 20 by a continuous guidance of the same laser beam, they are in perfect register with each other. The security element 60 is practically "sewn" by the static motif 64 extending beyond the edge of the color layer 20 with the surrounding banknote substrate 70.

Such a continuous motif between a screen-printing ink layer 20 and the surrounding substrate with color edge at the edge of the element can be achieved with perfect registration only by the laser application according to the invention. Another safety effect is formed in the described embodiment by the yellow-green color of the arranged within the ink layer portion 66, which results from the removal of the magnetic pigments and the stagnation of the yellow-green color pigments. The color of the partial region 66 therefore corresponds to the color base of the surrounding, color-shifting layer 20. Such a correspondence is very difficult to reproduce in terms of printing technology, in particular not together with the perfect registration of the continued partial regions 66, 68.

LIST OF REFERENCE NUMBERS

10

bill

12

security element

20

coat of paint

21

surrounding area

22

Marking, dynamic motif

24

inner area

26

Transition area

28

static motive

30

bullet magnet

32

field lines

40

substratum

42

Area

44

magnetic pigments

50

acted upon area

52

magnetic interference layer pigments

54

modified pigments

60

security element

62, 64

static motives

66, 68

subregions

70

Banknote substrate

Claims (15)

1. A security element (12) for security papers, value documents and other data carriers, having at least one ink layer (20) having magnetically aligned and in their alignment fixed magnetic pigments (44) that form, in the form of patterns, characters or a code, a first motif (22) that displays a dynamic motion effect when the security element is tilted, wherein the first, dynamic motif (22) is combined with, in the form of patterns, characters or a code, a second, static motif (28) that is produced by the action of laser radiation in the ink layer and whose fixed contour, when viewed, forms a fixed reference point for the dynamic motif, characterized in that in the region of the second, static motif (28), the orientation of the magnetic pigments (44) is destroyed, or in that, in the region of the second, static motif (28), the magnetic pigments are removed from the ink layer (20), wherein the aligned pigments (44) form a three-dimensional-seeming appearance.
2. The security element according to claim 1, characterized in that the magnetic pigments are developed to be non-spherical, especially platelet-shaped.
3. The security element according to claim 1 or 2, characterized in that the magnetic pigments are dyed and/or optically variable, especially include color-shifting thin-film elements having an interference layer structure.
4. The security element according to at least one of claims 1 to 3, characterized in that the magnetic pigments are formed on the basis of ultra-pure iron powder.
5. The security element according to at least one of claims 1 to 4, characterized in that the magnetic pigments are aligned in the form of a centrosymmetric marking that preferably includes, in its interior, a substantially uniformly aligned region having a diameter of 5 mm or more, and/or that the magnetic pigments are aligned by a sphere magnet or by multiple spaced-apart sphere magnets in the form of the first motif.
6. The security element according to at least one of claims 1 to 5, characterized in that the second, static motif is arranged completely within the ink layer having the aligned magnetic pigments, or that the second, static motif is arranged in register partially within and partially outside the ink layer having the aligned magnetic pigments.
7. The security element according to at least one of claims 1 to 6, characterized in that, the ink layer is formed by a screen printing layer, and/or that the ink layer having the magnetic pigments is formed on the basis of a UV-curing ink system.
8. The security element according to at least one of claims 1 to 7, characterized in that the ink layer includes, in addition to the magnetically aligned magnetic pigments, dyes, luminescent substances or further pigments, especially colored pigments and/or luminescent pigments and/or optically variable pigments.
9. The security element according to at least one of claims 1 to 8, characterized in that the ink layer is arranged on a background layer that is colored or optically variable, especially in that the background layer exhibits a colored or optically variable further marking.
10. A method for manufacturing a security element (12) for safeguarding security papers, value documents and other data carriers, in which

    - at least one ink (20) layer having magnetically alignable magnetic pigments is applied to a substrate,

    - the magnetic pigments (44) are magnetically aligned in the form of patterns, characters or a code and are fixed in their orientation, thus producing a first motif (22) having a dynamic motion effect and a three-dimensional-seeming appearance, and

    - through laser impingement in the ink layer, a second, static motif (28) in the form of patterns, characters or a code is produced whose fixed contour, when viewed, forms a fixed reference point for the first motif, wherein in the region of the second, static motif (28), the orientation of the magnetic pigments (44) is destroyed, or in that, in the region of the second, static motif (28), the magnetic pigments are removed from the ink layer (20).
11. The method according to claim 10, characterized in that an ink layer on the basis of a UV-curing ink system is used and the aligned magnetic pigments are fixed by UV-curing the ink layer.
12. The method according to claim 10 or 11, characterized in that the ink layer is printed in screen printing.
13. The method according to at least one of claims 10 to 12, characterized in that the laser impingement is carried out with a pulsed infrared laser in the wavelength range from 0.8 µm to 3 µm, preferably with short pulse durations of 20 ns or less, particularly preferably with short pulse durations of 12 ns or less.
14. A data carrier (12) having a security element according to at least one of claims 1 to 9.
15. The data carrier according to claim 14, characterized in that the security element is arranged in or over a transparent window region or a through opening in the data carrier.

Images