WO2022017634A1

WO2022017634A1 - Security feature having tilt-dependent motif depiction

Info

Publication number: WO2022017634A1
Application number: PCT/EP2021/025189
Authority: WO
Inventors: Kai Herrmann SCHERER
Original assignee: Giesecke+Devrient Currency Technology Gmbh
Priority date: 2020-07-22
Filing date: 2021-05-25
Publication date: 2022-01-27
Also published as: CN116018275A; DE102020004423A1; EP4185470A1

Abstract

The invention relates to a planar security feature (3) which changes appearance when it is tilted over a tilt angle range (11). The security feature comprises microelements (15,16) which present a main motif (20) and an additional motif (22).

Description

The invention relates to a two-dimensional security feature with optically variable motifs, a security element with such a security feature, and an object secured therewith.

Portable data carriers such as documents of value - in particular banknotes, checks or the like - ID documents or chip cards, but also other valuables such as branded goods are often provided with security features for security purposes, which allow the authenticity to be checked and at the same time serve as protection against unauthorized reproduction. The security features can be present as part of a security element or can be generated directly on the object to be protected. Security elements can be designed, for example, in the form of an embedded security thread, an embedded film or as a transfer element, such as an applied security strip or patch.

A generic security feature is known from WO 2019/219239 A1. The security feature of documents of value, such as banknotes, checks or the like, has: a structure that presents a main motif and an additional motif, which change their appearance when the security element is tilted over a tilting angle range, the structure having micro-elements that represent the main motif and the additional motif present. The micro-elements present the main motif in such a way that it is fully visible at a certain starting tilt position and only partially visible when the tilt position is changed towards a certain end tilt position within the tilt angle range, and not at all when the end tilt position is reached is more visible. The representation of achromatic motifs based on micromirrors is also known from WO 2019/219236 A1. In the generic security element, it is possible to arrange the micro-elements - designed as micro-mirrors in the generic prior art - in such a way that two motifs are only visible on the banknote from a certain viewing angle and one motif disappears when the banknote is tilted. Such a motif change is achieved with micromirrors, for example, in that the mirror gradient along the perpendicular to the tilting axis has only positive values in one section and only negative values in another section Movement effect combined. However, this limits the number of micromirrors available to present the subjects in their sections and for their respective viewing angle ranges, which can affect the brightness of the subjects.

The invention is based on the object, in contrast, of providing a security element that is easier to recognize and is therefore ultimately forgery-proof.

The invention is defined in the independent claims. The dependent claims relate to preferred developments.

A flat security feature changes its appearance when tilted over a tilting angle range. It has a structure that has a main motif and presenting an additional motif, the structure having micro-elements presenting the main motif and the additional motif.

The micro-elements present the main motif in such a way that it is visible in a surface area at a certain starting tilt position and when the tilt position is changed towards a certain end tilt position of the tilt angle range, the size of the surface area in which the main motif is visible is also visible increasing changing the tilt position decreases. The micro-elements present the additional motif in such a way that it moves towards the main motif when the tilt position is changed to the final tilt position.

In the present case, the micro-elements present at least two parts of the additional motif in such a way that the parts of the additional motif move in different directions towards the main motif when the tilt position is changed.

The micro-elements also present the main motif in such a way that at least two sections of an edge of the surface area recede along the different directions before the movement of the additional motif towards the main motif.

With the two differently directed movements of the additional motif towards the main motif, the size of the area in which the main motif is presented decreases. For the viewer, this creates the overall impression that the main motif is being displaced or wiped away from two directions by the moving additional motif. The tilting angle range begins with the starting tilting position and ends with the end tilting position. The main motif can no longer be seen in the final tilted position. For the viewer, it appears as if it has been completely pushed aside or wiped away when it is tilted. The additional motif (with its parts) can already be seen in the starting tilted position. Alternatively, however, the additional motif or its at least two parts only become partially visible from the starting tilted position.

When changing the tilting position from the starting tilting position to the ending tilting position, the main motif should be visible in the surface area, the size of which decreases with increasing tilting. The at least two sections of the edge of the surface area move towards the main motif or towards its center - like the parts at the same time and along different directions. When changing the tilt position, the movement of the sections follows the movement of the additional motif.

The property of the additional subject to move towards the main subject in different directions when tilted through the tilting angle range and at the same time to reduce the size of the surface area in which the main subject is visible can be understood as a subject-centred movement effect, because the movement takes place Motif-centric, ie towards the main motif, preferably towards a center of the main motif. This creates an impression that goes beyond a mere change of two motifs, namely, for example, the impression that the additional motif displaces or wipes away the main motif. This effect happens, for example, in such a way that the main subject is fully visible at a certain starting tilt position. If you change the tilt position towards the specific final tilt position, ie over a tilt angle range, the main motif is only partially visible, e.g. only part of the main motif, until it is in the final Tilted position is no longer visible. The surface area in which the main motif is presented is thus reduced optically during the tilting process, supported by the simultaneous movement of the additional motif. The reduction takes place in such a way that the edge of the surface area has at least two sections that withdraw accordingly in front of the additional motif, which moves towards the main motif. This takes place simultaneously for the at least two sections and along the different directions of the parts of the additional motif, ie both sections move in a different direction.

It should be noted that in the following it is not always repeated that the micro-elements present the main motif or the additional motif, i.e. are each set up accordingly for the described expression of the main and/or the additional motif. The at least two parts of the additional motif are adjacent to the at least two sections of an edge of the surface area, which recede simultaneously and along different directions from the movement of the additional motif towards the main motif. In the following, it is also not repeatedly pointed out that the movement of the (two, three or more or ...) parts of the additional motif towards the main motif is associated with a corresponding decrease in the surface area of the main motif or a retreat of the sections.

In configurations, a size and/or shape of the parts of the additional motif--moving in different directions--remain constant when the tilted position is changed. In particular, unchanged parts of the additional motif can easily move when changing the tilt position, for example two opposing bars move with a fixed shape and size. However, a change in size is also conceivable constant shape, such as a bar growing in size, representing a change in shape at constant size, such as transitioning from an elongated oval to a bar of equal area. In particularly preferred configurations, a size and/or shape of the parts of the additional motif moving in different directions can change with the tilted position. A use together with un changed parts of the additional motif is conceivable. For example, in addition to the two opposing unchanged bars, two bars moved perpendicularly and also opposing each other could be presented. The main motif is initially surrounded by a bar in each of the four spatial directions. As the tilt increases, all four bars move to the center of the main subject. If two bars remain unchanged, the length of the other two bars decreases according to the movement of the unchanged bars, so that in particular overlapping of the four bars can be avoided. An exact counter-rotation of Be movements is not required. Alternatively, it is also conceivable that all four (or more) parts of the additional motif arranged around the main motif decrease in size, in the case of bars in their length, in the same way. Three parts arranged symmetrically around the main motif, such as bars, ovals or the like, with three different directions of movement, for example at an angle of 120 degrees to one another, are another embodiment of a moving additional motif. The three bars will in turn move towards each other and towards the main subject. The length of the bars (and thus also their area) decreases with increasing tilt position.

In particular, the size of a surface area in which the additional motif is visible can increase or decrease as the tilted position increases. This Size may preferably increase or decrease at the same rate as the surface area of the main subject decreases. For three, four or more shifting parts of the additional motif that decrease in one direction (such as as bars in length), the size of the surface area of the additional motif decreases. To the extent that the surface area of the main motif decreases, the size of the surface area of the additional motif then also decreases. In other configurations, however, the size of the parts can also increase. For example, if the edge of the two parts, initially two bars or equilateral triangles, of the additional motif that is remote from the main motif remains stationary, the edge of the part that is close to the main motif moves towards the main motif. The two parts of the additional motif increase in size, particularly as much as the surface area of the main motif decreases. When tilting, for example, two narrow bars become two wide rectangles. In particular, the impression of a curtain closing in front of the main motif can be created for the viewer. Two elongated isosceles triangles (with the unchanged long side facing the main motif) emerge from two equilateral triangles (eg with one side facing the main motif). In preferred configurations, the portion of the main motif that is presented (and thus visible to the viewer) decreases with an increasing tilt position within the tilt angle range. The viewer gets the impression that the additional motif is increasingly (on two or more sides) covering or wiping away the main motif. Alternatively, the main motif can be presented in increasingly reduced form with an increasing tilt position within the tilt angle range. The viewer gets the impression that the additional motif covers the main motif (on two or more sides) and suppresses or compresses it. In configurations, a center of the main motif is stationary and/or the at least two parts of the additional motif move towards the center of the main motif. Motifs presented in three dimensions (or floating above or below a structural level), whose presentation only adapts to the changed viewing angle when tilted, are still stationary motifs in the present sense.

Since the motif-centered movement effect of the additional motif preferably ends centrally, namely when the two sections have moved completely towards one another, the micro-structural elements only have to be divided into two effects in each partial area of the structure. The brightness of the security element is particularly high, since a large number of micro-elements in the structure can be used to display the changing main motif. This fundamentally improves the light intensity. Furthermore, the main motif is at least partially visible for all tilt angles within the tilt angle range. As a result, it can also be designed to be very bright and easier to recognize.

The main motif and the additional motif can together be referred to as the overall motif of the security feature. The area in which the overall motif is presented corresponds minimally to the initial area of the main motif and can be composed of the initial areas of the main motif and the additional motif. The different directions of movement of the (two) parts of the additional motif are advantageously in at least one tilted position within the tilting angle range at an angle of more than 90 degrees (up to 180 degrees) to one another. nander, preferably at an angle of more than 120 (up to 180 degrees) zueinan the. The directions of movement are more preferably at an angle of (170 to) 180 degrees to one another, ie they are in opposite directions. The directions of movement of the at least two parts of the additional motif can remain unchanged within the tilting angle range, ie have one of the angles mentioned constantly. Alternatively, the angle can change as the tilt position increases within the tilt angle range. In particular, the angle between the directions of movement can increase or decrease. At least one of the angles mentioned is reached or assumed during the change, or a maximum of 180 degrees is reached or assumed. For example, the additional motif could supersede the main motif like a (opening or closing) door with two wings.

It has already been mentioned that the additional motif comprises at least two parts. In preferred variants, there are exactly two, exactly three, exactly four or more than four parts moving in different directions towards the main subject. The specified angles apply to two of the parts, in particular to only one pair of parts (or in each case to two pairs of parts moving in different directions). The number of sections of the edge to be receded corresponding to the number of parts of the additional motif. The parts of the additional motif can be spaced or non-spaced parts. When tilting or changing the tilt position, the distance can change or remain unchanged. For example, four separate beams can move in opposite directions when tilted, in particular in pairs move towards each other and either remain separate, i.e. spaced apart, or combine to form a (constantly decreasing) frame around the main motif, i.e. form non-spaced parts. Non-spaced parts of the additional motif, for example parts of a rectangular or oval frame or a circular ring, can have visible border lines between the parts or (without border lines between the parts) be recognizable to the viewer as differently moving parts of the additional motif. The additional motif preferably comprises parts spaced apart from one another within the tilting angle range in at least one tilted position, the majority of tilted positions or each tilted position. In addition or as an alternative, the additional motif within the tilting angle range comprises parts that are not spaced apart in at least one tilted position, in the majority of tilted positions or in every tilted position. It is particularly advantageous to form the parts of the additional motif by separate bars which - in opposite directions or with an increasing tilted position increasingly in opposite directions - move towards one another, with the bars in particular still being spaced apart in the end tilted position. It has also already been indicated that the additional motif with its parts can completely surround the main motif, preferably in the form of a ring, in particular in the form of a circular ring, in the form of a frame, in particular as a rectangular frame, or in the form of an eyelid.

In particular configurations, the additional motif has a detailed structure which changes when it is tilted and/or makes the movement of the parts recognizable. For example, a pattern, a subdivision or the three-dimensionality of the additional motif, such as a curved appearance out of the structural plane, can serve as a detailed structure. The detail structure can be adapted to the movement of the additional motif for the to make the viewer recognizable. Alternatively or additionally, the detailed structure can also undergo a change that is independent of the movement of the additional motif onto the main motif. For example, a detail structure in a part that does not change in size and shape can move as a pattern in a different direction than the part itself when tilted, or change as a curvature.

For tilts that are perpendicular to the tilt from the start tilt position to the end tilt position, the main motif is preferably presented basically unchanged. This also improves perception. A main motif that is rotationally symmetrical or circular in outline is therefore particularly preferred, since such an element works particularly well if it can be tilted in all directions. Motifs that show a three-dimensional effect are particularly safe because they are more difficult to reproduce. Thus, the main motif and/or the additional motif can be presented to the viewer in three dimensions or in a plane deviating from the structural plane, in particular floating above or below the structural plane. The additional motif is preferably presented floating in a plane that lies above a plane in which the main motif is presented. The basic structures for presenting the main motif or the moving additional motif, possibly also with a three-dimensional effect, are sufficiently known per se, just for example from WO 2011/066990 A2, WO 2015/078572 A1 or WO 2016/180522 A1.

As a rule, the structure is a micromirror structure with a large number of specularly reflecting, preferably inclined and planar (or non- diffractive), micro mirror. In particular, the structure comprises an embossed layer, preferably a hardened embossing lacquer layer, in particular designed as a UV-hardened embossing lacquer layer, which is provided with a reflection-increasing coating.

At least some of the microelements (or micromirrors) are advantageously provided with a color coating that produces a color impression. In advantageous configurations, the color coatings of the micromirrors are formed by translucent colors. Metallizations, for example made of aluminum, silver or an alloy, for example made of copper and aluminum, are also possible, as are thin-layer structures, in particular color-shifting thin-layer structures, gold-blue or silicon-aluminum thin layers. The color coatings can also be formed by translucent colors with a metallic mirror coating underneath, for example made of aluminum. The color coatings can represent a translucent image made up of several translucent colors, which is backed by a mirror, for example made of aluminum. Luminescent colors, in particular fluorescent colors with a metallic mirror coating, can also be used as color coatings. The color coatings can also be formed by structural colors, in particular by nano and binary structures, which are embossed on or in the micromirrors. Finally, nanoparticle colors can also be considered as color coatings, such as gold-blue particles, various effect pigments, color-changing pigments or super silver. The color coatings are preferably applied directly to the micromirrors and follow their relief profile.

In the preferred embodiment, the micro-elements of the main motif and the additional motif are nested in the structure. The micro elements can be arranged in a regular pattern and nested within each other be nested. However, micro-elements of different shape and/or size and/or spacing are preferably provided in an arrangement of micro-elements. In particular, unintentional diffractive effects are thus avoided. The nesting is preferably also carried out irregularly. In particular, the nesting can be pseudo-random and/or in pixels with m*n micro-mirrors (with the same or different size/shape of the micro-mirrors or with fixed, pseudo-random and/or brightness-oriented positioning of one or more micro-elements of a motif within the pixels). The structure can also contain micro-elements that serve as a background for the main and/or the additional motif, for example by not reflecting in the direction of the viewer in any of the tilt positions of the tilt angle range or in the current tilt position. The security feature realizes a continuous and at the same time easily recognizable and traceable disappearance of the main motif when the item is tilted. In addition, a wide variety of configuration options are opened up, which result in a very easily recognizable and understandable security element. The security feature can be provided in a security element. The security element can have its own carrier layer, for example a plastic film, or it can be carrierless. The security element is intended to be applied to an object to be secured, for example as a security patch or security strip, or to be introduced into an object to be secured, for example as a security thread. The object to be secured can be a data carrier, in particular a valuable document such as a banknote, or an ID card or chip card, or a product or its packaging. For an application to the object usually many Sicherheitsele elements are provided in a row on an intermediate carrier with which they are detachably connected for transfer to the object.

Alternatively, the present security feature can also be created directly on the object to be secured, such as data carriers, in particular documents of value (especially banknotes), identity cards or chip cards, or products or their packaging.

The invention is explained in more detail below on the basis of exemplary embodiments with reference to the attached drawings, which also disclose features that are essential to the invention. These exemplary embodiments are for illustrative purposes only and are not to be construed as restrictive. For example, a description of an embodiment with a large number of elements or components should not be interpreted to the effect that all of these elements or components are necessary for implementation. Rather, other embodiments may include alternative elements and components, fewer elements or components, or additional elements or components. Elements or components of different exemplary embodiments can be combined with one another unless otherwise stated. Modifications and variations, which are described for one of the embodiments, may also be applicable to other embodiments. To avoid repetition, the same or corresponding elements in different figures are marked with the same reference numbers and are not explained more than once. In the figures show:

1 is a plan view of a bank note,

2 shows a schematic representation for explaining tilt angles when viewing a security feature of the bank note, 3 shows a schematic representation to explain the structure of a surface area of the security feature of FIG. 1, FIGS

5-8 Schematic representations for further embodiments with regard to a change of motif in the security element of FIG. 1.

1 shows a top view of a bank note 2 or a preliminary stage of such a bank note that is not yet fit for circulation. The banknote comprises a security element 4 with a security feature 3, which has a microstructure on its surface area 5, which shows a main motif. The appearance of the main subject depends on the tilt angle by which the security feature 3 is tilted when viewed. The term "tilting" here refers, as usual, to an angular change in the relative position between the essentially flat security feature 3 and the viewing direction from which an observer looks at the security feature. This relative position can be changed by tilting the security feature with a fixed viewing direction or by changing the viewing angle with a fixed security feature. Combinations are of course possible. For the sake of simplicity, a tilting of the security feature 3 is assumed below. What is not shown in the figure is that the security element 4 will generally have a large number of other security features in addition to the security feature 3 shown, which may be present adjacent to, at a distance from, or on the back of the security feature 3 . The other usual ones are also not shown in the figures Security features and/or security elements that the banknote will include.

2 shows that reference is made to tilting about a tilting axis 6. The tilting axis 6 lies in particular in the plane of the security feature

3 and thus also in the plane of the banknote 2. The tilting considered here runs over a tilting angle range 11 from a starting tilting position 8 to an end tilting position 10. The starting tilting position 8 follows a first zone 13 and the end -Tilt position 10 is followed by a second zone 14, which will be explained later.

As Fig. 3 shows schematically, the surface area 5 of the security feature 3 has a large number of first micro-elements 15 and second micro-elements 16, which are nested in one another, for example in a first pattern 17 (first micro-elements 15) or a second pattern 18 (Second micro elements 16) are arranged. Such an arrangement and configuration of microelements is known from the prior art, for example from WO 2019/219239 A1 with microelements in the form of tilted micromirrors, in particular planar micromirrors or microconcave mirrors. However, it is also possible to use diffractive, specularly reflecting microelements. The micro-elements 15, 16 ensure that a main motif 20 (see FIG. 4A) and an additional motif 22 (see FIG. 4E) are presented. The first micro-elements 15 present the main motif 20, the second micro-elements 16 the additional motif 22.

3 shows a regular arrangement of microelements 15, 16, which are also regularly nested in one another, only as an example of a nested arrangement. However, in an arrangement of microelements, microelements of different shape and/or are preferred Size and / or spacing provided. In particular, unintended diffractive effects are thus avoided. The nesting is also preferably more complex than shown in the figure. The nesting is also preferably carried out irregularly. In particular, the nesting can be pseudo-random and/or in pixels with m*n micro-mirrors (with the same or different size/shape of the micro-mirrors or with fixed, pseudo-random and/or brightness-oriented positioning of one or more micro-elements of a motif within the pixel). Also not shown in the figures are the positions of micro-elements in the arrangement or micro-elements that serve as the background of a motif, for example by not reflecting in the direction of the viewer at all or not at the tilt angle. Nesting in a section or surface area allows different motifs to be displayed in succession (or simultaneously) in the section, depending on the tilt angle.

The surface area 5 preferably comprises only specularly reflecting micro-elements of exactly two motifs, as a result of which the main motif 20 and the additional motif 22 are presented in a very bright manner. If you now start tilting in the first zone 13 of FIG. 2, ie before the starting tilt position 8, only the main motif 20 is visible in one embodiment (cf. FIG. 4A), which is presented by the first microelements 15 is as long as the tilt 12 is in the first zone 13. 4A shows the main motif 20 as an example as a ring. Alternatively, an additional motif 22 is also already visible for tilt angles that lie in the first zone 13

(See Figure 4B). The additional motif 22 can, for example, be stationary for tilt angles in the first zone 13 or can move away from the main motif 20 because of it. The additional motif 22 is presented to the viewer by the second micro-elements 16 . For all figures, the general comment applies that the motifs in the figures are shown dark against a light background, but are presented to the viewer as bright (because they are directed towards the viewer and reflecting), while the background appears darker (because they are not reflecting towards the viewer). .

If the tilted position 12 is moved out of the first zone 13, the additional motif 22 moves from the starting tilted position 8 in two different directions 26a, 26b towards the main motif 20. In this embodiment, the additional motif 22 comprises two parts 22a, 22b. In this example, the two parts 22a, 22b of the additional motif are formed by elongated bars. The directions of movement 26a, 26b are at an angle of 180 degrees to each other, so they are directed in opposite directions to the main motif 20. As illustrated in FIG. 4B, the main motif 20 occupies a surface area 25 which is delimited by a border 24 . The border 24 has two sections 24a, 24b.

As shown in FIGS. 4B to 4D, when tilting through the tilting area 11, the additional motif 22 moves in the two directions 26a, 26b towards the main motif 20 and at the same time the surface area 25 of the main motif 20 becomes smaller. The main motif 20 disappears because it is only presented within this surface area 25 . The two sections 24a, 24b of the edge 24 of the surface area 25 move towards one another along the opposite directions of movement 26a, 26b. The sections 24a, 24b thus follow the movement of the parts 22a, 22b of the additional motif 22 during tilting from the starting tilting position 8 to the end tilting position 10. The movement of the parts 22a, 22b is directed towards the center of the main motif 20. The movement along the directions 26a, 26b is subject-centred. The disappearance of the main motif 20 corresponds in area and direction to the movement of the two parts of the additional motif. For the viewer, the two moving parts of the additional motif displace the main motif. The main subject 20 disappears with increasing tilt until it is no longer seen at all, as shown in Figure 4E. The portions of the boundary 24 of the area have met at the center of the main subject 20 originally seen. The same applies to the parts 22a, 22b of the additional motif 22. The two parts 22a, 22b of the additional motif can—as indicated in FIG. 4E—be presented at a distance from one another as separate parts or without a spacing as the additional motif.

For example, for tilt angles that are in the second zone 14 of FIG. 2, only the additional motif 22 can be presented (cf. FIG. 4E). Alternatively, the additional motif 22 for the tilt angle of the second zone 14 can also disappear again or no longer be presented, so that neither of the two motifs 20, 22 is presented any more.

In the embodiment of FIGS. 4B to 4E, the additional motif 22 has an expansion which is not as great as that of the fully visible main motif 20. However, the main motif 20 is no longer presented in areas over which the parts 22a , 22b of the additional motif 22 have already run, as FIG. 4E clearly shows. The additional motif 22 can also have the effect of a pre-hang for the viewer, which pushes itself in front of the main motif 20 on both sides. As shown in FIGS. 4B-4E, this can be achieved if the parts 22a, 22b of the additional motif are followed by further strip-shaped or bar-shaped parts which move in the same way as the two parts 22a, 22b. The other parts can, for example, be distinguishable from the two parts 22a, 22b in terms of their brightness (light/medium light), their pattern or their color. In such cases, the size of the additional motif increases to the same extent as the size of the surface area 25 decreases. As an alternative to the appearance according to FIG. 4E, the parts 22a, 22b of the additional motif can in turn also grow together and/or fuse in the end tilted position.

As an alternative to moving parts of the additional motif 22 that have the same appearance (displacement), it is also possible for the parts 22a, 22b to change their size with the movement, e.g. so that the part furthest from the main motif

Edge of the parts 22a, 22b remains stationary during the movement effect. This reinforces the impression of a curtain or screen that slides in front of the main subject 20. Such an embodiment is shown in FIGS. 5A-5D.

5A shows a detailed structure 23 in the parts 22a, 22b of the additional motif 22. The detailed structure 23 is arranged in the section of the parts 22a, 22b close to the main motif. During the tilting process--as shown in FIGS. 5B to 5E--the detailed structures 23 of the additional motif 22 also move in the corresponding direction 26a, 26b. The edge of the parts 22a, 22b that is remote from the main motif remains stationary, so that the size of the additional motif 22 increases overall. The parts 22a, 22b of the additional motif have an (arbitrary) detail structure 23 which makes the movement of the parts recognizable. The detail structure 23 can therefore have any desired design and is only shown as a triangle as an example. In addition to shapes, patterns, etc., a level reference (such as curvature out of the substrate level, position above or below the substrate level) can also serve as a detailed structure. The movement of the parts 22a, 22b of the additional motif is visible to the viewer - at the latest through the detail structures 23. Like a curtain on both sides, the moving parts of the additional motif 22 apparently prevent the observer from seeing the main motif 20. Due to the movement of the additional motif, the change when tilting is clearly different from a mere uncovering of a static additional motif. Optionally, sections of parts 22a, 22b remote from the main motif can remain static. Alternatively, sections of the parts 22a, 22b that are remote from the main motif can move differently, in particular at a lower speed and/or at a speed that is dependent on the location (and/or the tilting angle). These configurations in particular can reinforce the impression of a curtain.

6A and 6B show, among other things, that the parts of the additional motif 22 moving towards one another and the sections of the border 24 receding are not restricted to rectilinear parts. Furthermore, it can be seen that a simultaneous movement of more than two parts of the additional motif can take place in more than two directions centered on the main motif. FIG. 6A shows a main motif 20, shown here purely as an example as a smiley, which is surrounded by an annular border 24, shown here as a circle, for example. In this representation, the additional motif 22 is in the form of a circular ring, e.g. as an iris diaphragm. It surrounds the main motif 20. The additional motif 22 can comprise a multiplicity of parts 22a, 22b. A detailed structure 23 can be present through the boundaries of the parts 22a, 22b or, as described with reference to FIG. 5A, be designed differently. The additional motif 22 moves towards the main motif when it is tilted. The direction(s) 26 of the movement(s) of the additional motif 22 is (are) directed towards the center of the main motif.

6A and 6B show the main motif 20, which disappears with increasing tilting through the tilting area 11 in that the additional motif moves towards the main subject in more than two subject-centric directions 26 . The border 24 around the main subject 20 pulls together accordingly. The additional motif 22 or the parts 22a, 22b of the additional motif also change their appearance when tilted. For example, the contraction of an iris diaphragm or a blink of the eyelid is simulated. Alternatively, the additional motif has a constant ring thickness and contracts when tilted. In FIGS. 6A and 6B, the additional motif 22 changes when tilted by a dynamic detail structure 23, for example in the form of an adjusting iris diaphragm, etc., as is shown in FIGS. 6A and 6B. The outline of the parts of the additional motif changes. The basic external shape of the additional motif, here a ring, preferably remains unchanged. In addition or as an alternative, the additional motif 22 can also have a curvature, for example, the maximum of which is always in the middle of the ring.

When tilting, the additional motif 22 preferably moves to an end tilted position up to the former center of the main motif, which has then disappeared.

7 shows an embodiment which illustrates that the directions of movement 26a, 26b of the parts 22a, 22b of the additional motif move towards the main motif 22 and towards one another, without the movements having to be exactly in opposite directions. As in the example shown, the directions of movement 26a, 26b can be at an obtuse angle, for example of 180+/−45 degrees, ie 135 to 225 degrees (exactly opposite corresponds to 180 degrees). For example, for straight bars as parts of the additional motif or for straight sections 24a, 24b of the border 24, the parts 22a, 22b move towards the main subject 22 and towards each other. In Fig. 7, the loading movement is similar to a director's flap. A tilting condition similar to that of FIG. 4C is shown. 8 makes it clear that there is no direct abutment between the additional motif 22 and the main motif 20 at the sections 24a, 24b, although such a design would of course be possible. More preferably, there will be a gap 34 between the main motif side boundary 32 of the supplementary motif 22 and the opposite moving portion 24a of the rim. The gap 34 can be seen by the observer, ie it has a size of at least 100 gm.

The main subject 20 may dynamically change with tilting in embodiments - in addition to changing the surface area 25 in which it is visible.

Looking again at FIG. 2, one can imagine that the second zone 14 could be adjoined by a further range of tilting angles, in which the movements run in precisely opposite directions. The additional motif moves outwards and the surface area 25 with the main motif grows as it is tilted further. A further first zone would then in turn adjoin the further tilting angle range. For this purpose, the second zone 14 could, for example, be essentially perpendicular to the plane of the security feature. When tilting further beyond the second zone 14, the counter-movement is evident, ie, for example, FIGS. 4E to 4B. However, such configurations are disadvantageous because the light is weaker because the number of available micromirrors per motif decreases. Reference List

bank note

security feature

security element

surface

tilt axis

Start tilt position

final tilt position

tilt angle range

Tilt position first zone second zone first microelement second microelement first pattern second pattern

main subject

additional motif

detail structure

parts

border

sections

surface area

directions

border

gap

Claims

P atentClaims

1. Flat security feature (3) that changes its appearance when tilted over a tilting angle range (11) and that has a structure that presents a main motif (20) and an additional motif (22), the structure having micro-elements (15,16) which present the main motif (20) and the additional motif (22), the micro-elements (15) presenting the main motif (20) in such a way that it is visible in a surface area (25) at a specific starting tilt position (8) and when changing the tilted position (12) towards a certain final tilted position (10) within the tilting angle range (11), the size of the surface area (25) in which the main subject (20) is visible, with increasing changing of the tilted position (12) decreases, and wherein the micro-elements (16) present the additional motif (22) in such a way that it moves towards the main motif (20) when the tilted position (12) changes towards the final tilted position (10), characterized in that the micro-elements (16 ) at least two part e (22a, 22b) of the additional motif (22) in such a way that the parts (22a, 22b) of the additional motif (22) move in different directions (26; 26a, 26b) to move onto the main motif (20), and the micro-elements (15) present the main motif (20) in such a way that at least two sections (24a, 24b) of an edge (24) of the surface area (25) along the different directions (26; 26a, 26b) before the movement of the additional motif (22) towards the main motif (20).

2. Security feature (3) according to claim 1, characterized in that the additional motif (22) can also be seen in the starting tilted position (8) and/or the main motif (20) in the end tilted position (10). is more to see.

3. Security feature (3) according to claim 1 or 2, characterized in that the size and/or shape of the parts (22a, 22b) of the additional motif (22) moving in different directions remains constant when the tilted position (12) is changed , Preferably the parts (22a, 22b) of the additional motif (22) move when changing the tilted position (12).

4. Security feature (3) according to one of claims 1 to 3, characterized in that the size and/or shape of the parts (22a, 22b) of the additional motif (22) moving in different directions changes with the tilted position (12), In particular, the size of a surface area in which the additional motif (22) is visible increases or decreases as the tilted position (12) increases, preferably increasing or decreasing to the same extent as the surface area (25) of the main motif (20) decreases .

5. Security feature (3) according to one of the preceding claims, characterized in that the main motif (20) with increasing tilted position (12) within the tilting angle range (11) increasingly ver disappears.

6. The security feature (3) according to any one of the preceding claims, characterized in that the main motif (20) becomes increasingly smaller as the tilted position (12) increases within the tilting angle range (11).

7. The security feature (3) according to any one of the preceding claims, characterized in that a center of the main motif (20) is stationary and/or the at least two parts (22a, 22b) of the additional motif (22) focus on the center of the main motif (20 ) to move.

8. The security feature (3) according to any one of the preceding claims, characterized in that the different directions of movement (26a, 26b) of the parts (22a, 22b) of the additional motif (22) in a tilted position (12) within the tilting angle range (11) in one Angles of more than 90 degrees to one another, preferably at an angle of more than 120 degrees to one another, more preferably or at most in opposite directions, ie at an angle of 180 degrees to one another.

9. Security feature (3) according to one of the preceding claims, characterized in that the directions of movement of the at least two parts (22a, 22b) of the additional motif (22)

- Are unchanged within the tilting angle range (11); or

- Change with increasing tilt position (12) within the tilt angle range (11), in particular an angle between the directions of movement increases or decreases.

10. Security feature (3) according to one of the preceding claims, characterized in that the additional motif (22) comprises exactly two, exactly three or more than three parts (22a, 22b) moving in different directions towards the main motif.

11. Security feature (3) according to any one of the preceding claims, characterized in that within the tilting angle range (11) the additional motif (22) in at least one tilted position (12), the majority of Tilt positions (12) or each tilt position (12) spaced parts (22a, 22b).

12. Security feature (3) according to one of the preceding claims, characterized in that within the tilting angle range (11) the additional motif (22) has non-spaced parts in at least one tilted position (12), the majority of tilted positions (12) or each tilted position (12). (22a, 22b).

13. The security feature (3) according to any one of the preceding claims, characterized in that the parts (22a, 22b) of the additional motif (22) are formed by bars which - in opposite directions or increasingly in opposite directions as the tilted position increases - move towards one another, with in particular the beams are spaced apart in the final tilted position.

14. Security feature (3) according to one of the preceding claims, characterized in that the additional motif (22) surrounds the main motif (20); preferably in the form of a ring, in particular in the form of a circular ring, in the form of a frame, in particular as a rectangular frame, or in the form of an eyelid.

15. Security feature (3) according to one of the above claims, characterized in that the additional motif (22) has a detailed structure (23) which changes with tilting and/or makes the movement of the parts (22a, 22b) recognizable.

16. Security feature (3) according to any one of the above claims, characterized in that the main motif (20) and / or the additional motif (22) for the viewer three-dimensionally or in one of the plane of the structure deviating level, in particular floating above or below the structure level, is presented, with the additional motif preferably being presented floating in a level which lies above a level in which the main motif is presented.

17. The security feature (3) according to any one of the above claims, characterized in that the structure is a micromirror structure made of directionally reflecting, preferably inclined and planar, micromirrors; and/or the structure comprises an embossed layer, preferably a cured embossed lacquer layer, in particular as a UV-cured embossed lacquer layer, which is provided with a reflection-increasing coating.

18. Security element (4) for an object to be protected, such as data carrier or product, wherein the security element comprises a security feature (3) according to one of claims 1 to 13, wherein preferably the security element (4) either comprises or has its own carrier layer is gerlos and / or the security element (4) is detachably provided on a Zwischenträ ger.

19. Object (2), such as a data carrier or product, with a security element (4) according to claim 18 or a security feature (3) according to one of claims 1 to 17.