Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
  • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
  • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
  • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
  • B42D25/29—Securities; Bank notes
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
  • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
  • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
  • B42D25/30—Identification or security features, e.g. for preventing forgery
  • B42D25/328—Diffraction gratings; Holograms
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
  • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
  • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
  • B42D25/30—Identification or security features, e.g. for preventing forgery
  • B42D25/342—Moiré effects
• • B42D2033/24—

Definitions

• the invention relates to a security document, in particular a banknote or a badge, which is arranged over a first region, in which a first transparent optical element is arranged, and via a second region
• the first region and the second region are in this case arranged on a flexible carrier of the security document in such a way that the first and the second region can be brought into overlap with one another, for example by bending, folding or twisting the flexible carrier.
• EP 0930979 B1 discloses a self-checking banknote consisting of a flexible plastic carrier.
• the flexible plastic support is made of a transparent material and is provided with a clouded sheath, leaving a clear transparent surface as a window.
• a magnifying lens is now arranged as a self-certification center.
• a microprint area is provided on the banknote, which shows a small character, a small line or a filigree pattern.
• the banknote is folded and thus the transparent window and the micro-printing area are brought into coincidence.
• the magnifying lens can now be used to make the micro-pressure visible to the viewer and thus to verify the banknote.
• the magnification of the micropattern resulting for the observer is determined by the clear range of vision (in normal eyes 25 cm) and by the focal length of the magnifying lens.
• the proposed in EP 0930979 B1 embodiment of the banknote is thus hidden in the Banknote arranged security feature by means of a arranged on the banknote verification means indicated.
• EP 0256176 A1 describes a bank passbook with an encrypted identification sign, which is inside on the back
• Book cover or printed on one side of the book and means for authenticity proof has in the form of a transparent area.
• the transparent area is configured as a read screen for decrypting the encrypted identifier as soon as that screen is overlaid with the area containing the encrypted identifier by closing the bookband.
• the invention is based on the object of specifying an improved security document.
• a security document comprising a first transparent region in which a first transparent optical element is arranged, and a second region in which a second opaque optical element is arranged, which exhibits a first optical effect, wherein the first Region and the second region are arranged so spaced apart on a support of the security document that the first and the second region can be brought into coincidence with each other, and in the overlapping of the second with the first optical element at a first distance between the first and second A second optical effect is exhibited by the optical element and, when the second optical element is covered with the first optical element, at a second distance between the first and second optical elements which is greater than the first distance, a third optical effect different from the second optical effect is exhibited.
• the invention thus provides the user with a novel verification method that goes far beyond mere identification of an enhanced security feature.
• the invention makes it possible to provide security documents with particularly obvious, surprising security features that are particularly easy for the user to check.
• the invention opens up the possibility of integrating further security features into a security document in a particularly cost-effective manner. By using only one transparent and one opaque optical element, it is possible to provide the security document with three or more security features. This makes it possible to produce by means of the invention easily verifiable, cost manufacturable and difficult to imitate security documents.
• a first pattern when the second with the first optical effect is overlapped with the first distance, a first pattern appears as a second optical effect and when the second with the first optical element is overlaid with the second distance, an enlarged representation of the first pattern as the third one optical effect.
• a disappearance of specific information and / or a change of information takes place so that different information is displayed to the viewer at the first and at the second distance. Furthermore, it is possible that at a third or fourth distance between the first and the second optical element show further different optical effects.
• both the second and the third optical effect preferably differ significantly from the first optical effect, thus representing, for example, different information or significantly different size representations of an information.
• the opaque second optical element has a first layer structured according to a micropattern.
• Micropattern here means that the pattern is a high resolution pattern whose typical size is higher than the resolution of the human eye.
• the first transparent optical element has a transparent layer in which a convex lens having a focal length approximately corresponding to the second distance is superimposed with a lens pattern matched to the micropattern, which consists of a plurality of refractive or diffractive micro-lenses of one focal length exists that corresponds to the first distance. If the distance between the overlapping first and second optical elements corresponds to the first distance, then the information coded in the deviation from pattern regions or parts of the pattern regions of the micropattern and lens raster is shown.
• the observer is made to see the micropattern or parts of the micropattern. It is particularly advantageous in this implementation of the invention that the at different spacing of the overlapping first and information showing second optical elements can be largely independent of each other and a relatively abrupt, binary change of information can be achieved.
• the micropattern preferably has a typical size of less than 100 ⁇ m, preferably 100 to 40 ⁇ m. Furthermore, the micropattern preferably consists of a multiplicity of identical, repetitive structural elements. The dimensions of the individual structural elements should be less than 200 ⁇ m. Such repetitive patterns allow simplified design and verification of second and third optical effects to the viewer.
• the structure elements of the micropattern may be arranged in a different area distribution in the surface area of the second optical element, so that the first optical effect in the manner of a grayscale image resulting from direct observation of the further optical element depends on the areal density of the distribution of the structure elements is.
• the first layer of the second optical element structured in accordance with the micropattern may be a color layer or a reflective layer, which is structured in accordance with the micropattern.
• a diffractive structure is formed in the first layer so that the first to third optical effects exhibit a diffraction pattern.
• the convex lens is formed by a diffraction-optically active structure, which generates the effect of a convex lens by diffractive optics.
• the structure is preferably formed by a lattice structure continuously changing with respect to its lattice frequencies and optionally further lattice constants over the area region, which is either a binary structure or designed such that in each case one flank of the lattice grooves is parallel to one another and approximately parallel to one another Perpendicular to the main plane of the boundary layer, while the angle of the respective other edges of the grid surface with respect to a perpendicular to the main plane of the boundary layer over the surface area changes substantially continuously.
• the lattice depth of the lens structure is preferably less than 10 ⁇ m.
• diffractive lens has the advantage over the use of a "refractive lens", for example a Fresnel magnifying lens, that the necessary structural depth is considerably reduced and accordingly large-area convex lenses can be integrated in the security document. It is also possible that the micro-lenses of the lens grid are realized as "diffractive lenses”.
• the superposition of the convex lens and the lens raster is preferably realized by dividing the second optical element into a plurality of adjacent first and second regions. In each of the first areas, one or more micro-lenses of the micro-lens grid are formed, and in the second areas, structures that form the convex lens are formed. The width and / or the length of the first and second regions is in each case below the resolution of the human eye. This type of superimposition of the convex lens and the lens raster ensures high efficiency and luminosity of the lens raster and the convex lens.
• the second optical element has a microstructured moiré pattern.
• the associated first optical element has an at least partially transparent layer in which is superimposed a moiré pattern matched moire analyzer and a convex lens having a focal length corresponding to the second distance and suitable for microstructuring the moire Visualize patterns. Is the distance between them overlapping first and second optical elements very low, so moire image is generated by superimposing the Moire pattern and moire analyzer. If the distance between the overlapping first and second optical elements is increased towards the second distance, the moire image is no longer generated and the observer is shown an enlargement of the microstructuring of the moire pattern. At a first distance between the first and second optical elements, the moiré image is thus displayed, and at a second distance between the first and second optical elements, an enlarged representation of the microstructuring of the moiré pattern is shown.
• the macroscopic lens has a diameter of 3 mm to 50 mm, preferably 10 mm to 30 mm.
• the focal length of the macroscopic lens is preferably between half the diameter and ten times the diameter, in particular between one to five times the diameter.
• the microlens grid e.g., square or hexagonal closest packing
• the focal length of the microlenses is between half the diameter and one hundred times the diameter, preferably between one to ten times the diameter.
• this embodiment of the invention has the advantage that the information shown as a second and as a third optical effect can be designed independently of each other and an abrupt, binary change of the information shown in distance increase / decrease can be realized. As a result, particularly memorable security features can be implemented in the security document.
• the second optical element has a concave mirror element and the first optical element has a convex lens.
• the first optical element has a convex lens.
• the second optical element preferably has a replication lacquer layer and a reflective layer adjoining the replication lacquer layer, wherein a diffractive relief structure is formed in the interface between the replicating lacquer layer and the reflective layer and produces the effect of a concave mirror element by means of diffraction optics.
• a diffractive n concave mirror element
• the second optical element only reflects the mirror image of the observer, who experiences the optical changes already described above when viewed through the superimposed first optical element.
• the relief structure formed in the interface between the replication lacquer layer and the reflective layer is a superimposition of a structure which produces the effect of a concave mirror element and a diffractive structure which produces an optical pattern.
• a hologram or KINEGRAM ® when viewed through the first optical element of the above-described optical changes is subjected, ie that the size of the hologram decreases in distance reduction and increases in distance enlargement. Such an effect is very difficult to simulate with commercially available technologies.
• Fig. 1 shows a schematic representation of different viewing situations of a security document according to the invention.
• FIG. 2 shows a sectional view of a transparent optical element for a security document according to the invention according to FIG. 1.
• FIG. 3 shows a sectional view of an opaque optical element for a security document according to the invention according to FIG. 1.
• FIG. 4 a shows a schematic illustration of a re-structure for the optical element according to FIG. 2.
• FIG. 4b shows a schematic representation of a further relief structure for the optical element according to FIG. 2.
• FIG. 4c shows a top view of a relief structure for the optical element according to FIG. 2.
• FIG. 5 shows a schematic illustration of different viewing situations of a security document according to the invention for a further exemplary embodiment of the invention.
• FIG. 6 shows a plan view of an opaque optical element for the security document according to FIG. 5.
• FIG. 7c shows schematic representations for clarifying a transparent optical element for the security document according to FIG. 7c
• FIG. 1 shows a security document 1 in different viewing situations 41, 42 and 43.
• the security document 1 is a value document, for example a banknote or a check. It is also possible that the
• Security document 1 an identification document, such as a badge forms.
• the security document 1 consists of a flexible carrier 17, on which a transparent optical element 18 is arranged in a region 11 and an opaque optical element 19 in a region 12.
• the carrier 17 is preferably a carrier made of paper material, which is provided with an imprint and in which further security features, for example watermarks or security threads, are introduced.
• the carrier 17 is a plastic film or a laminate consisting of one or more paper and plastic layers.
• a window-shaped opening for example by punching, is introduced into the carrier 17, which is subsequently closed again by applying the transparent optical element 18.
• the security document 1 in the area 11 has a transparent window with the transparent optical element 18.
• a transparent or partially transparent material is already used as the material for the carrier 17 and the carrier can thus remain in the region 11. This is the case, for example, if the carrier 17 consists of a transparent plastic film, which in the area 11 not provided with a haze layer. Furthermore, it is also possible to produce the transparent window already in papermaking and to introduce the transparent optical element 18 into the carrier 17 in the manner of a security thread.
• a patch 13 is applied to the carrier 17, on which the opaque optical element 19 is arranged.
• the patch 13 is preferably the transfer layer of a transfer film, for example a hot stamping foil, which is bonded to the carrier 17 under the action of pressure and heat by means of an adhesive layer.
• the patch 13 may have, in addition to the optical element 12, one or more further optical elements 14 and 16 which, as in the region 15, may form a combination representation with the optical element 19.
• the optical elements 14 and 16 is, for example, diffraction gratings, holograms, Kinegrams ® or indica executed with effect pigments.
• the transparent optical element 18 and the opaque optical element 19 may be arranged on two different sheets of a security document, for example a passport, which are joined together, for example by stitching or gluing.
• optical element 18 The detailed structure of the optical element 18 will now be explained with reference to FIGS. 2, 4a, 4b and 4c.
• Fig. 2 shows the carrier 17, which consists of a paper material of a thickness of about 100 microns and in the region 11 has an opening produced by means of a punching or cutting operation.
• the optical element 18 is preferably applied under heat and pressure to the paper material of the carrier 17, in which an adhesive layer of the optical element 18 is activated by heat and pressure. Due to the pressure exerted at the same time Area of the optical element 18, the recess shown in Fig. 2 created.
• the optical element 18 consists of a carrier film 181, an adhesion-promoting layer 182, a replication lacquer layer 183, an optical separation layer 184 and an adhesive layer 186.
• the carrier film 181 consists, for example, of a PET or BOPP film with a layer thickness of 10 to 50 ⁇ m.
• the function of the carrier film 181 is to provide the necessary stability for bridging the aperture.
• the primer layer 182 has a thickness of 0.2 to 2 ⁇ m and is applied to the carrier film by a printing method.
• the replication lacquer layer 183 is made of a thermoplastic or crosslinked polymer into which a relief structure 185 is replicated by means of a replication tool under the action of heat and pressure or by UV replication.
• the optical separation layer 184 has a sufficiently large difference in the refractive index (for example 0.2) with respect to the replication lacquer layer 183 and is largely planar on the surface opposite the relief structure, as indicated in FIG.
• the optical separating layer 184 can also be omitted here. Furthermore, it is also possible for the adhesive layer 186 to be omitted in the area of the relief structure 185 so that the relief structure 185 comes into direct contact with the air.
• the structure 185 is preferably not a relief structure forming a refractive lens, but rather a diffractive relief structure which produces the effect of a convex lens by means of diffraction optics.
• usable diffractive Re ran structures consist of their lattice frequency and possibly further lattice constants over the area continuously changing lattice structures, as shown for example in the figures Fig. 4a and Fig. 4b.
• FIG. 4 a shows the re-structure 185 formed between the replication lacquer layer 183 and the optical separation layer 184, in each case one flank 65 the grid grooves are parallel to one another, while the angle 67 of the other side 64 changes substantially continuously with respect to a vertical main plane of the separating layer over the surface area.
• a paraboloidal portion 66 is arranged, starting from which both the grating frequency and the angle 67 of the edge 64, as illustrated in Fig. 4c, continuously changes.
• FIG. 4 b shows a binary Re structure 187 formed between the replication lacquer layer 183 and the optical separation layer 184, which likewise produces the effect of a convex lens in a diffraction-optical manner.
• the advantage of using such a binary relief structure in comparison with the relief structure shown in FIG. 4a or a sinusoidal relief structure is that the profile depth 68 necessary for the generation of the lens effect can be reduced.
• the values of the relief depth indicated in FIGS. 4a and 4b are the phase difference in radians, from which the geometrical depth of the reflected structure in a known manner depends on the wavelength of the light used (eg of 500 nm) for the maximum sensitivity of the human eye).
• the diameter of the lens structure is generally between 0.5 and 300 mm, the focal length of the lenses usually being between the value of the lens diameter and five times this value.
• FIG. 3 shows the carrier 17 and the patch 13, which forms the optical element 19 in the region 12.
• the patch 13 has an adhesive layer 131, a reflection layer 132, a replication lacquer layer 134, a pattern-shaped decorative layer 135 and a protective lacquer layer 135.
• a relief structure 136 is formed in the area 12.
• the material for the metal layer is substantially chromium, aluminum, copper, iron, nickel, silver, gold or an alloy with these materials in question.
• the reflectivity could also be achieved with an encapsulated system (two suitable materials with a sufficiently large difference in refractive index) to air.
• a thin-film layer sequence having a plurality of dielectric or dielectric and metallic layers may be used.
• the relief structure 136 between the replication lacquer layer 134 and the reflective layer 132 forms a concave mirror element.
• the reactive structure 136 is preferably not a macrostructure forming a refractive concave mirror element, but a diffractive structure which produces the effect of a concave mirror element by means of diffraction optics.
• FIGS. 4a to 4c wherein the relief structures which can be used for this purpose are mirror-symmetrical to the relief structures described with reference to FIGS. 4a to 4c, the grid frequency starting increases continuously from the center of the concave mirror element, but the curvature has an opposite sign.
• the relief structure 136 is formed in the present exemplary embodiment by a relief structure which is formed from an additive superimposition of a structure that produces the effect of a concave mirror element and another optical pattern-generating diffractive structure analogously to the relief structures 185 and 187.
• This diffractive structure is, for example, a hologram in the form of a Swiss cross.
• the decorative layer 135 is preferably patterned according to a micro-pattern which is just below the resolution of the human eye lies.
• the decorative layer 135 is structured in the form of the number "100".
• the micropattern is a repetitive micropattern which is composed of a large number of identical structural elements.
• each of these structural elements is formed from a representation of the number "100".
• the surface density of the structural element is varied in the form of a gray-scale image and thus contains further image information that is immediately recognizable to the human eye.
• the decorative layer preferably stands on a print applied by means of a printing process and may consist of a transparent colored layer, or of a layer containing interference-dye pigments or cholesteric liquid-crystal pigments, which produces an optically variable color impression. Further, it is also possible, as a decorative layer, a thin-film layer system for the production of viewing angle-dependent
• the decorative layer is preferably arranged between the replication lacquer layer 134 and the reflection layer 132.
• Another possibility is not to continuously apply the reflection layer 132 to the replication lacquer layer 134, but instead to pattern it pattern-like, preferably pattern-shaped as described above according to a micropattern. After the reflection layer 132 has been applied over the whole area, the reflection layer 132 is partially demetallised by positive / negative etching or partially removed by means of laser ablation.
• the security document 1 exhibits the following optical effects in the viewing situations 41, 42 and 43:
• an optical effect 52 is displayed in the form of a holographic representation a Swiss cross in the background to a representation of the number "100".
• an optical effect 51 is shown in the form of a comparison with the optical effect 52 significantly enlarged representation of the number "100" in front of the holographic representation of the Swiss Cross. If the optical elements 18 and 19 are not coincident, a grayscale image, which is coded into the structuring of the decorative layer 135, appears as an optical effect.
• FIG. 5 shows a security document 7 which has an opaque optical element 73 in a region 71 and a transparent optical element 74 in a region 72.
• the optical elements 73 and 74 are in this case applied to a carrier 75.
• the optical elements 73 and 74 are not in registration, in a viewing situation 45, the optical elements 73 and 74 are spaced apart by a distance 25 and in one
• the optical element 73 has a layer patterned in accordance with a micropattern and thus consists, for example, of a protective lacquer layer, a decorative layer structured in accordance with the micropattern, and an adhesive layer.
• the decorative layer consists for example of a color layer, an effect pigment layer or a reflective layer, which is structured by corresponding pattern-shaped imprint, by positive / negative etching or by ablation in the form of the micropattern.
• Fig. 6 shows an enlarged plan view of the optical element 73 showing a micropattern formed from a plurality of similar repetitive structural elements 76 in the form of the letter "A".
• the structural elements 76 it is possible for the structural elements 76 to be arranged on the optical element 73 in a different surface density, so that further information, which is directly recognizable to the human eye, is coded into the micropattern in the manner of a gray scale image.
• a structural element micrographs, microimages or entire microtext passages can also be used.
• the Micro-pattern is composed of differing structural elements.
• the optical element 73 is constructed like the optical element 19 according to FIG. 3, with the difference that the diffractive structure 136 is not subjected to the additive superimposition of a structure which produces a concave mirror element in an optical diffraction pattern.
• the diffractive structure formed in the optical element 73 between the replication lacquer layer and the reflection layer is preferably a background hologram, which is also visible in the viewing situation 44.
• the diffractive structure for.
• a black mirror structure provided in accordance with a micropattern shaped pattern areas, for example in the area covered by the structural element 76 areas. In the background area, in this case, a second, differently diffractive structure, for.
• a matt structure may be provided.
• the optical element 74 is designed like the optical element 18 according to FIGS. 1, 2 and 4a to 4c, with the difference that the relief structure 185 corresponds to a grid of a convex lens having a focal length which is the distance 25 corresponds to a matched to the micropattern of the optical element 73 lenticular grid having a plurality of micro-lenses of a focal length corresponding to the distance 26.
• the Re structure 185 has a 60 ⁇ m / 60 ⁇ m grid of a macroscopic list with a microlens grid.
• the macroscopic lens has a diameter in the range of 3 mm to 50 mm, preferably 10 mm to 30 mm.
• the focal length of the lens is between half the diameter and ten times the diameter, preferably between the simple diameter to five times the diameter.
• the macroscopic lens has a diameter of 25 mm and a focal length of 75 mm.
• the microlens grid consists of microlenses with a diameter in the range of 5 .mu.m to 500 .mu.m, preferably between 50 .mu.m and 200 ⁇ m.
• the focal length of the microlenses is between half the diameter and one hundred times the diameter, preferably between one to ten times the diameter.
• the diameter of the microlenses is 150 ⁇ m at 1 mm focal length.
• FIGS. 7a to 7c illustrate several embodiments of such a superimposition of a convex lens and a microlens raster:
• the surface area of the optical element 74 is divided into first areas 77 and second areas 78, which are respectively disposed adjacent to each other.
• the width of the first and second regions 77 and 78 is below the resolution of the human eye, so that the distance between two first or two second regions is, for example, ⁇ 200 ⁇ m.
• the micro-lenses of the micro-lens grid are arranged.
• the micro-lenses are here preferably designed as refractive lenses, but it is also possible that these lenses are designed analogous to the embodiments of Fig. 4a to Fig. 4c as a "diffractive" lens.
• a diffractive relief structure forming a convex lens according to FIGS. 4a to 4c is arranged distributed over the surface regions 78 on the surface region of the optical element 73.
• first regions 81 and second regions 82 are arranged alternately next to one another, here too the distance between two first regions 81 and two second regions 82 being below the resolving power of the human eye.
• first surface regions 84 and second surface regions 85 are arranged adjacent to one another, in which case only a single convex lens of the lens raster is arranged in the first surface regions 84, which is then preferably in the form of a "diffractive" lens is realized.
• the viewer thus has the following visual effects:
• the viewer is shown an enlarged representation of one or more structural elements 76 as an optical effect.
• the viewer is presented with information encoded in the relative position of the micropattern or parts of the micropattern to the lens raster.
• the viewing situation 44 is shown as an optical effect, in the configuration of the micropattern of the optical element 73 coded greyscale image or a hologram or other diffraction-optically generated patterns, for example a KINEGRAM ®, which results from the superposition of the diffractive from molded in the pattern regions structures generated optical effects.
• structures of a moiré analyzer may be arranged instead of a microlens grid in the regions 77, 81 and 84 according to FIGS. 7a to 7c of the optical element 74, and instead of the micropattern according to FIG. 6, a moiré pattern is disposed in the optical element 73.
• a moiré pattern here is a pattern formed from repetitive structures which, when superimposed with or viewed through another pattern formed by repetitive structures acting as a moiré analyzer, forms a new pattern, namely a moire pattern. Image shows hidden in the Moire pattern.
• this moiré effect results from the superimposition of dark and light stripes, which are arranged in accordance with a line grid, this line raster being partially out of phase for generating the moiré image.
• the lines of the line grid have curved areas and are arranged, for example, wave-like or circular.
• the decoding of the moiré image in such a line raster is likewise effected by a region-wise phase shift of the line raster, whereby two or more different moiré images can be encoded in such a moiré pattern.
• Moire patterns and Moire analyzers are possible, which are based on the so-called “Scrambled Indica ® technology” or on a hole pattern (round, oval, square holes of various design).
• the moiré analyzer arranged in the regions 77, 82 and 84 thus consists, for example, of an opaque stripe pattern.
• the moiré pattern provided in the optical element 74 can be realized in the manner described with reference to the micropattern of FIG. 6 as a structured decorative layer or in a diffractive structure shaped in pattern regions.
• the moire pattern is hereby substructured, whereby this substructuring preferably takes place in the form of a microtext or of repeating microimages.
• the optical elements 74 and 73 overlap one another when overlapped, i.
• the distance between the optical elements 73 and 74 is very small, the moiré image generated by the superimposition of the moiré pattern and moire analyzer becomes apparent. If the distance is increased, the observer will see the enlarged representation of the microstructuring of the moiré pattern, that is, for example, an enlarged and thus readable representation of a microtext. If the optical elements 73 and 74 do not overlap, then the optical effects already described in relation to the viewing situation 44 are shown.

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• Business, Economics & Management (AREA)
• Accounting & Taxation (AREA)
• Finance (AREA)
• Credit Cards Or The Like (AREA)
• Diffracting Gratings Or Hologram Optical Elements (AREA)
• Inspection Of Paper Currency And Valuable Securities (AREA)
• Printing Methods (AREA)
• Optical Elements Other Than Lenses (AREA)
• Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)

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  • 2004-09-15 DE DE102004044458A patent/DE102004044458B4/de not_active Expired - Fee Related
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