EP2897812A1 - Sicherheitselement mit darstellungsanordnung - Google Patents
Sicherheitselement mit darstellungsanordnungInfo
- Publication number
- EP2897812A1 EP2897812A1 EP13770637.0A EP13770637A EP2897812A1 EP 2897812 A1 EP2897812 A1 EP 2897812A1 EP 13770637 A EP13770637 A EP 13770637A EP 2897812 A1 EP2897812 A1 EP 2897812A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- metallic
- security element
- metallized
- film
- support structures
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000969 carrier Substances 0.000 claims abstract description 7
- 239000010410 layer Substances 0.000 claims description 71
- 229910052751 metal Inorganic materials 0.000 claims description 44
- 239000002184 metal Substances 0.000 claims description 44
- 239000011248 coating agent Substances 0.000 claims description 32
- 238000000576 coating method Methods 0.000 claims description 32
- 239000000463 material Substances 0.000 claims description 30
- 239000012790 adhesive layer Substances 0.000 claims description 28
- 238000000034 method Methods 0.000 claims description 22
- 230000000694 effects Effects 0.000 claims description 16
- 230000036961 partial effect Effects 0.000 claims description 16
- 239000011888 foil Substances 0.000 claims description 15
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 230000008859 change Effects 0.000 claims description 9
- 238000010030 laminating Methods 0.000 claims description 7
- 239000000049 pigment Substances 0.000 claims description 7
- 238000004049 embossing Methods 0.000 claims description 5
- 238000001465 metallisation Methods 0.000 description 16
- 238000012546 transfer Methods 0.000 description 12
- 230000008569 process Effects 0.000 description 6
- 230000008901 benefit Effects 0.000 description 4
- 230000001788 irregular Effects 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 238000007740 vapor deposition Methods 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000007373 indentation Methods 0.000 description 3
- 239000000976 ink Substances 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 229920002799 BoPET Polymers 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000002985 plastic film Substances 0.000 description 2
- -1 Alui inium Substances 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000006735 deficit Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000002346 layers by function Substances 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 230000000873 masking effect Effects 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
- 238000005019 vapor deposition process Methods 0.000 description 1
- 239000002966 varnish Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
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
- B42D25/40—Manufacture
- B42D25/405—Marking
- B42D25/425—Marking by deformation, e.g. embossing
-
- 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
-
- 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
- B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
- B42D25/373—Metallic materials
-
- 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
- B42D25/40—Manufacture
- B42D25/405—Marking
- B42D25/43—Marking by removal of material
-
- B42D2033/10—
-
- B42D2033/20—
-
- B42D2033/24—
-
- B42D2035/20—
-
- 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
- B42D25/324—Reliefs
-
- 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
- B42D25/40—Manufacture
- B42D25/45—Associating two or more layers
- B42D25/455—Associating two or more layers using heat
-
- 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
- B42D25/40—Manufacture
- B42D25/45—Associating two or more layers
- B42D25/46—Associating two or more layers using pressure
-
- 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
- B42D25/40—Manufacture
- B42D25/45—Associating two or more layers
- B42D25/465—Associating two or more layers using chemicals or adhesives
- B42D25/47—Associating two or more layers using chemicals or adhesives using adhesives
Definitions
- the invention relates to a security element for securing security papers, documents of value and other data carriers, having a representation arrangement for displaying one or more reference images whose motifs are each formed by visually recognizable, contrasting metallic and non-metallic subregions.
- the invention also relates to methods for producing such a security element, as well as equipped with a security element disk.
- Data carriers such as valuables or identity documents, but also other valuables, such as branded articles, are often provided with security elements for securing purposes, which permit verification of the authenticity of the data carrier and at the same time serve as protection against unauthorized reproduction.
- Data carriers in the context of the present invention are in particular banknotes, stocks, bonds, certificates, vouchers, checks, high-quality admission tickets, but also other forgery-prone papers, such as passports and other identity documents, credit cards, health cards, as well as product security elements such as labels, seals, packaging and the like.
- the term "data carrier” in the following includes all such objects, documents and product protection means.
- Security elements with optically variable elements which give the viewer a different image impression from different viewing angles, play a special role in securing, since these can not be reproduced even with high-quality color copying machines.
- the security elements can contain a tilting or changing picture, a moving picture or a stereo picture as a display arrangement.
- so-called Moire magnification arrangements are used as security features. The principal operation of such moiré magnification arrangements is described in the article "The Moire Magnifier", MC Hutley, R. Hunt, RF Stevens and P. Savander, Pure Appl. Opt. 3 (1994), pp. 133-142 said ⁇ -
- the security elements Contain the representations of the security elements differently colored motifs, they can be printed usually in a desired shape.
- the production is more difficult in motifs which are to be formed by contrasting metallic and non-metallic subregions, since metallizations can generally not be generated directly in motif form, but only over the entire surface, for example by vapor deposition of a metal layer in a vacuum vapor deposition process.
- the present invention seeks to provide a security element of the type mentioned, which can be reliably manufactured with predetermined metallic and non-metallic portions. Also, advantageous methods for producing security elements of the type mentioned are to be specified.
- the display arrangement of a security element mentioned above comprises a motif layer having a plurality of metallized pixels and non-metallized pixels and a viewing grid spaced from the motif layer of a plurality of viewing elements, the metallized pixels and the non-metallized pixels viewed when viewed with the Viewing grid to produce the visually recognizable, contrasting metallic and non-metallic portions of the target images.
- the motif layer further comprises an embossed structure with elevations and depressions, wherein the non-metallized image elements of the motif layer are formed by non-metallized elevations of the embossed structure and the metallic image elements are formed by substantially metallized depressions of the embossed structure.
- Zurründest a portion of the substantially metallized wells contains in an area ratio between 0.1% and 25% small, raised support structures, which are visually unrecognizable when viewed with the viewing grid.
- the indentations with the support structures are referred to as "substantially" metallized in the context of this description
- the metallic impression of the metallic cavities formed by the indentations Image elements are not affected by the support structures for the viewer, as they are visually unrecognizable when viewed with the viewing grid.
- At least some of the substantially metallized depressions contain the support structures in an area ratio of between 2.5% and 10%. Furthermore, it is conceivable in principle, although not presently preferred, for at least some of the essentially metallized depressions to contain the support structures in an area fraction of more than 25%. In particular, at least under suitable lighting conditions, even with a comparatively high areal proportion of the support structures of, for example, 50%, the impairment of the metallic impression by the support structures can be regarded as negligible for the viewer, so that the target images remain visually recognizable, albeit with reduced contrast.
- the support structures in the depressions are irregular, for example, stochastically distributed.
- the support structures in the depressions may also be arranged regularly in a grid whose moiré effects with the viewing grid remain below the resolution limit of the human eye or, as explained in more detail below, by suitable arrangement of the support structures with respect to the viewing elements entirely be avoided.
- the height of the support structures preferably corresponds to the depth of the recesses in which they are arranged. In general, however, the height of the support structures may also be smaller as long as they ensure a sufficient distance in the manufacture of an adhesive-coated acceptor film from the bottom of the recesses, as described in more detail below.
- the support structures comprise pillars of circular, oval, triangular, rectangular or polygonal cross-section, wherein the cross-section of the pillars preferably has an area between 0.25 ⁇ m 2 and 25 ⁇ m 2 .
- the support structures comprise irregular, continuous web structures in which the width of the web structures preferably lies between 0.1 ⁇ m and 5 ⁇ m.
- the support structures comprise non-contiguous web elements, each consisting of one or more line pieces and whose width is preferably between 0.1 ⁇ and 5 ⁇ . lies.
- the support structures may comprise straight, parallel web elements whose width is preferably between 0.1 ⁇ and 5 ⁇ .
- the mentioned types of support structures can be combined with each other so that different recesses contain different support structure types. Also in the same recess several different types of support structures can be provided.
- the support structures in a subarea contain hidden information in the form of characters or a coding so as to integrate an additional authenticity feature in the security element.
- all depressions whose dimensions exceed a maximum dimension provided with support structures of the type mentioned.
- maximum dimensions are of various parameters, in particular the depth of the wells, the pressure used in the laminating process, the Thickness of the adhesive layer, etc. dependent.
- maximum dimensions can be determined by a person skilled in the art for each parameter selection with the aid of less orienting tests.
- all depressions which have a dimension of more than 30 ⁇ m (maximum dimension) in at least one spatial direction are provided with supporting structures.
- the viewing elements of the viewing grid are advantageously formed by spherical lenses, aspherical lenses, cylindrical lenses or one-or two-dimensional focusing microcavities.
- the viewing elements are pinhole apertures, slotted apertures, apertured apertured or slit apertures, Fresnel lenses, GRIN lenses (Gradient Refraction Index), zone plates, holographic lenses, Fresnel mirrors, zone mirrors or other elements with focussing or blanking effects educated.
- the motif layer of the representation arrangement preferably lies in the focal plane of the lenses or concave mirrors.
- the viewing elements are formed by cylindrical lenses and the support structures are formed by parallel, straight web elements, which are at an angle between 60 ° and 120 °, preferably between 85 ° and 95 °, particularly preferably of 90 ° to the axis of the cylindrical lenses extend. In this way, even with a regular arrangement of the support structures in a grid, moire effects with the viewing grid can be avoided.
- the representation arrangement itself may be, in particular, a change picture, a motion picture, a morph picture or a stereo picture, but with advantage also a micro-optical display arrangement, in particular a ⁇ - Magnification arrangement, a magnification arrangement of the moire type or a modulo magnification arrangement.
- a micro-optical display arrangement in particular a ⁇ - Magnification arrangement, a magnification arrangement of the moire type or a modulo magnification arrangement.
- the motif layer of the presentation arrangement is preferably located in the focal plane of the lenses or concave mirrors.
- the motif layer may, however, in particular in the case of non-magnifying representational arrangements, for example in the case of non-enlarging change images, also lie in a plane (parallel) which deviates slightly from the focal plane of the lenses or concave mirrors.
- the angular ranges in which the motifs are simultaneously recognizable or in which one motif "transitions" into another
- this does not affect the contrast or sharpness of the subjects.
- an additional structuring preferably a diffractive structure, a structure having a matting or scattering effect and / or a nanostructuring, is introduced into the depressions of the embossed structure.
- the motif layer can be provided over the entire area or over part of its surface, for example in the form of a half-tone representation, with at least one printing dye and / or with at least one reflective coating material, preferably a metal, a surface-tilting system, a high-index material, metal pigments or effect pigments be.
- the invention also includes a data carrier equipped with a security element of the type described above.
- the security element may in particular be embedded in the data carrier or applied to the data carrier.
- the invention also includes a method for producing a security element having a representation arrangement for displaying one or more target images whose motifs are each formed by visually recognizable, contrasting metallic and non-metallic subregions, with the following method steps:
- elevations and the depressions generate image elements of a motif layer of the representation arrangement, which generate visually recognizable, contrasting metallic and non-metallic subareas of the target images when viewing the motive layer with a viewing grid of the representation arrangement,
- the viewing elements are impressed before or after step ' (a) (i) into the further major surface of the first film material opposite the main surface of the first film material or into an embossable layer on the further major surface of the first film material opposite the main surface.
- an additional structuring preferably a diffractive structure, a structure having a matting or scattering effect and / or a nanostructuring, is introduced into the recesses of the embossed structure in step (a).
- the invention also includes a method for producing a security element with a representation arrangement for representing a or multiple target images whose motifs are each formed by visually recognizable, contrasting metallic and non-metallic subregions, with the following process steps:
- elevations and the recesses generate picture elements of a motif layer of the representation arrangement, which generate visually recognizable, contrasting metallic and non-metallic parts of the set images when the motif layer is viewed with a viewing grid of the presentation arrangement,
- step (e2) producing a presentation assembly by combining the motif layer of the acceptor sheet with a viewing grid of a plurality of viewing elements such that the metallized pixels and the non-metallized pixels viewed visually discern the visually discernible, contrasting metallic and non-metallic Create subareas of the target images.
- the metal coating present in the contact region on the raised supporting structures of the donor oil can also be transferred to the adhesive layer of the acceptor foil by separating donor oil and acceptor foil.
- the metal coating is applied over the entire surface or part of the area. It should be noted that the metal coating must later be partially replaced again. It must therefore not adhere too strongly to the substrate, at least less strongly than the achievable bond strength with the later to be used adhesive. A sufficiently low adhesive force may possibly already be achieved by a suitable choice of the materials for the film material or the embossable layer. Preferably, however, before the application of the metal coating in step (a) (ii), a adhesion-reducing treatment of the surface of the embossed structure to be coated is carried out before the application of the metal coating in step (a) (ii), a adhesion-reducing treatment of the surface of the embossed structure to be coated is carried out.
- the motif layer after step (dl) or step (d2) is advantageously over the entire surface or part of the area, for example in the form of a half-tone display, with at least one printing ink and / or provided with at least one reflective coating material, preferably a metal, a color-shifting system, a high refractive index material, metal pigments or effect pigments.
- at least one printing ink and / or provided with at least one reflective coating material preferably a metal, a color-shifting system, a high refractive index material, metal pigments or effect pigments.
- one or more printing inks are first applied and then additionally a reflective coating material, in particular a full-surface metallization.
- FIG. 1 shows a schematic representation of a banknote with a security element according to the invention, which contains a change image with two different target images
- FIG. 2 schematically shows the structure of a security element according to the invention, for example, the transfer element of FIG. 1 in cross-section,
- FIG. 4 shows in (a) and (b) schematically the donor film and the acceptor film in intermediate steps of the production of a security element according to the invention, Fig. 5, the acceptor of Fig. 4 (b) after the separation of the two
- FIG. 6 shows in (a) and (b) schematically the donor film in two intermediate steps in the production of a conventional motif layer
- FIG. 7 shows in (a) and (b) schematically the donor film in two intermediate steps in the production of a motif layer of a security element according to the invention
- FIG. 8 shows some advantageous configurations of support structures according to the invention
- FIG. 10 shows an embodiment of a security element with one
- FIG. 1 shows a schematic representation of a banknote 10, which is provided with a security element according to the invention in the form of a glued transfer element 12.
- the transfer element 12 represents a change image which presents to the viewer different target images 14A and 14B from two different viewing directions.
- the target images 14A, 14B each show a motif formed by visually recognizable and contrasting metallic and non-metallic portions 16A, 16B and 18A, 18B, respectively.
- the motifs are formed by metallic glossy letters "A" and "B" in front of a monochrome, non-metallic background, the viewer viewed obliquely from the left the letter "A”, viewed obliquely from the right the letter “B "perceives.
- the appearance of the security element alternates between the two target images 14A, 14B.
- the motifs can also be present in particular in the form of screened half-tone representations.
- a change picture may contain more than two reference pictures or the security element may have a motion picture, a pump picture, a morph picture or a stereo picture instead of a change picture.
- the security element may also be designed such that the appearance does not change back and forth between two or more reference images as described above in the case of an "east-west tilting" of the security element, but rather on tilting about any other axis. for example, in a "north-south tipping". In a north-south tilting the viewer perceives when viewed obliquely from above, for example, the letter "A" and viewed obliquely from below the letter "B" true.
- the invention is not limited in any way to alternating images or the variants mentioned. Rather, the invention can be used in all depiction arrangements with a partly metallic and partly non-metallic motif layer.
- the invention is also not limited to the transfer elements used for illustration in bank notes, but can also be used, for example, in security threads, wide security strips, or cover foils which are above a window or a continuous opening of a document are arranged.
- FIG. 2 shows schematically the structure of a security according to the invention.
- the security element 20 of FIG. 2 has a carrier 22 in the form of a transparent plastic film, for example, about 20 ⁇ thick PET film.
- a motif layer 26 is formed, which is divided into parallel to the cylindrical lenses 24 extending narrow strips 28A, 28B with a width of 10 ⁇ each.
- the carrier foil 22 and the cylindrical lenses 24 are matched to one another such that the motif layer 26 is located in the focal plane of the cylindrical lenses 24.
- the security element 20 When the security element 20 is viewed from the viewing direction 30A, only the stripes 28A are visible due to the focussing effect of the cylindrical lenses 24, and only the stripes 28B are visible when viewed from the viewing direction 30B.
- the strips 28A and 28B are therefore composed for the viewer to the desired target images, such as the target images 14A, 14B of FIG. 1 together.
- the desired desired images 14A, 14B were subdivided in a manner known per se into parallel strips 28A, 28B of the desired width and the strips thus obtained were assembled alternately to the motif layer 26.
- the parallel strips 28A, 28B need not be the same width. Examples For example, the strip 28 A and a width of 5 ⁇ . and the strip 28B has a width of 15 ⁇ .
- the proportion of the respective strip in the overall width has an effect on the angle range in which the desired target images 14A, 14B are visible to the viewer.
- the security element 20 typically includes further layers 32, such as protective, masking, or other functional layers, which are not essential to the present invention and, therefore, will not be described further.
- Tilting or alternating pictures showing different colored subjects are known.
- the motif parts of the target images lying in the individual strips 28A, 28B are usually printed in the desired form.
- the peculiarity of the alternating images described here consists in the fact that the motifs of the target images 14A, 14B are formed by contrasting metallic and non-metallic partial regions.
- metallizations can not be generated directly in a motif, but only over the entire surface, for example by vapor deposition of a metal layer in a vacuum deposition process.
- the motif layer 26 comprises a stamping layer 40 applied to the carrier 22 with an embossed structure with elevations 42 and depressions 44.
- the elevations 42 of the embossed structure are non-metallized and form non-metallized picture elements which, when viewed, produce the non-metallic portions 18A, 18B of the target images.
- the depressions 44 of the embossed structure are On the other hand, they are essentially provided with a metallization 46 and represent metallized picture elements which, when viewed, form the metallic subregions 16A, 16B of the target images.
- FIG. 4 The process sequence in the production of such a security element is illustrated in FIG. 4. Referring first to FIG.
- a donor sheet 50 in the form of a transparent plastic film 22 is used, which is coated with a transparent embossable layer 40.
- embossable layer 40 an embossed structure is impressed, the sequence of elevations 42 and depressions 44 is determined by the motifs of the desired target images, for example, the wells 44 represent the foreground and the surveys 42 represent the background of the respective subjects or vice versa.
- the structure depth of the embossed structure is preferably in the range between 0.2 ⁇ and 10 ⁇ and the line thickness is preferably in the range between 0.2 ⁇ and the width of the strip 28A, 28B, typically 5 ⁇ to 20 ⁇ .
- a metal is evaporated over the entire surface, so that a full-surface Metallbeschichrung 48 is formed.
- the common materials such as Alui inium, silver, gold, copper, zinc, chromium and alloys thereof come into question.
- FIG. 4 (a) both the protrusions 42 and the depressions 44 are covered with the metal coating 48.
- an adhesion-reducing treatment of the surface to be coated is preferably carried out.
- the thickness of the metal coating 48 depends on the desired later reflection behavior and on the metal used and is for example advantageously about 30 to 50 nm for aluminum.
- the donor sheet 50 thus produced is now brought into contact with an acceptor sheet 52 shown in FIG. 4 (b).
- the acceptor film 52 consists of a transparent film 54, which is coated over its entire surface with a transparent adhesive layer 56 on one of its main surfaces.
- the donor film 50 and the acceptor film 52 are pressed together, preferably under elevated pressure and elevated temperature, in order to transfer the metallization of the elevations 42 from the donor film 50 to the acceptor film 52.
- the elevations 42 of the donor film 50 are demetallized, while the metal coating 48 in the depressions 44 has not been transferred and therefore remains on the donor film 50, as shown in FIG. 3.
- the acceptor sheet 52 after separation contains the transferred metal coating portions 58 of the bumps 42 and thus has a metallization pattern inverted compared to the donor sheet. While the generation of a change image using the donor sheet 50 is described in detail herein, an alternate image may also be made using the acceptor sheet 52.
- a difficulty of the metal transfer method described may result from the sequence of elevations 42 and depressions 44 of the embossed structure being predetermined by the motifs of the target images, so that usually there is no regular alternating sequence of elevations and depressions, as in the schematic representation of FIGS and 4. Rather, with arbitrary choice of subject, large contiguous elevation or depression areas can result, which should be demetallised in the finished security element (elevation areas) or metallized (depression areas). While large survey areas can be demetallised without problems using the described metal transfer process can remain, the whereabouts of the metallization in large areas of specialization can be problematic.
- FIG. 6 shows a region 60 of the motif layer 26 in which both target images 14A, 14B of the alternating image have metallized partial regions.
- these are, for example, those surface areas of the transfer element 12 in which the metallic parts of the letters "A" and "B" overlap. Since metallized picture elements are formed in the described metal transfer method by depressions of the embossed structure, the embossed structure in this area contains recesses in both the strips 28A of the first reference image and in the strips 28B of the second reference image. As a result, a large contiguous recessed area 62 can arise which, depending on the specific shape of the motifs, can have an extent of more than 100 ⁇ m or even several millimeters.
- FIG. 6 (a) initially shows an intermediate step in the production of the security element, namely the donor film 50 after the full-surface coating of the embossed structure with metal 48, corresponding to the situation of FIG. 4 (a).
- the adhesive layer 56 of the acceptor film in the large recessed areas 62 can be pushed to the bottom of the recess, so that the acceptor film 52 is also adhesively bonded to the metal coating 48 there.
- the bonding then undesirably removes metal from the depression area 62, so that the metallization defects 64 shown in FIG. 6 (b) arise.
- additional support structures 70 are provided in the embossing structure shown in FIG.
- the support structures 70 are small raised structures, particularly ridges or pillars, which, as shown in FIG. 7 (a), in the larger recessed areas 72, submerge the acceptor sheet 52 to the bottom of the recess and thus undesired transfer prevent metal 48 from the recesses 72 out.
- the support structures 70 Since the metal deposited on the support structures 70 is usually also removed during parting, the support structures 70 must be designed in such a way that they can not be visually recognized when there is a lack of metallization when viewing the motif layer with the viewing grid. As a result, the support structures 70 differ fundamentally from the non-metallized elevations 42, which in fact represent the culturally metallized pixels which, when viewed with the viewing grid, produce the visually recognizable non-metallic portions of the target images.
- the visual unrecognizability of the support structures 70 is ensured by the fact that the support structures 70 occupy only 2.5% of the area of the recess 72 in which they are arranged, and that the support structures 70 also not in the grid of Micro lenses 24 and the strip 28A, 28B are arranged.
- This can be achieved for example by an irregular arrangement of the support structures 70, or else by a regular arrangement in a grid whose moiré effects with the lenticular grid 24 remain below the resolution limit of the human eye.
- For representations with cylinders derlinsen are particularly advantageous support structures whose largest extent extends substantially perpendicular to the axis of the cylindrical lenses.
- the figures show in plan view of the motif layer only a few of the support structures, as they can be arranged over the surface of a large-scale depression.
- the support structures shown in FIG. 8 can be used both in cylindrical lens display arrangements and in display arrangements with non-cylindrical lenses, such as the modulo magnification arrangements mentioned above.
- the pillars 80 are small cylindrical elevations with a cross-sectional diameter of 0.7 ⁇ to 2 ⁇ .
- the cross section of the buttresses 80 may also be non-circular, for example oval, triangular, rectangular or generally polygonal.
- the simultaneous use of buttresses 80 with different cross-sections also suppresses possible moire effects.
- the pillars 80 are arranged irregularly, but it is also a regular arrangement into consideration, which generates no visible moire effects with the viewing grid.
- the supporting webs 82 likewise shown in FIG. 8 are narrow, non-contiguous webs with a width of 0.1 ⁇ m to 5 ⁇ m and a length of a few ⁇ m. They can also be considered as supporting pillars with rectangular cross section.
- the support structures may be further formed by irregularly extending, interconnected web structures 84, as shown in the lower left in FIG. shows.
- a further variant is the web elements 86 shown at the bottom right in FIG. 8, each of which is composed of one or more line pieces.
- hidden information 88 such as the "G + D" logo, can be integrated into the motif layer of the security element with such web elements 86.
- the hidden information 88 is visually invisible due to its small dimensions when viewing the motif layer without aids strong magnifying glass or a microscope, the hidden information can be made visible and serve to authenticate the security element.
- the support structure designs shown in FIG. 9 are particularly well suited for use with cylindrical lenses whose axis is parallel to the direction 90.
- the parallel webs 92 have a width of 0.1 to 5 ⁇ to run at a distance of 10 to 30 ⁇ from each other.
- the webs 92 extend perpendicular to the axis 90 of the cylindrical lenses and thus in a division of the motif layer in parallel strips 28A, 28B ( Figure 2) and perpendicular to the strip extension.
- concealed information 94 can be contained in the parallel webs, such as the "G + D" logo shown, which is visually invisible due to its small size without aids, but made visible for authentication with a strong magnifying glass or a microscope
- short supporting webs 96 are provided as supporting structures, all of which run perpendicular to the axis 90 of the cylindrical lenses and whose position varies irregularly, as shown in the lower half of FIG.
- the height of the support structures preferably corresponds to the depth of the recesses, but it may also be chosen smaller or larger. All that is essential is that they prevent the adhesive layer of the acceptor film from being pressed to the bottom of the recesses during the laminating process.
- the foregoing is not intended to be construed as limiting the invention in any way to alternate images. Rather, the invention is generally applicable to display arrangements with a viewing element grid, in particular a lenticular grid.
- FIG. 10 shows an embodiment of a security element 100 with a representation arrangement in the form of a modulo magnification arrangement.
- a UV embossing varnish is applied to a carrier 102, which is formed by a transparent 19 ⁇ PET film, into which a parallelogram grid of spherical microlenses 104 is imprinted with a diameter of about 20 ⁇ .
- a motif layer 106 having an embossed structure 108 is arranged, whose non-metallized elevations 118 and metallized depressions 120 represent the imaged regions of a predetermined reference image. How the areas of a modulo magnification arrangement shown can be determined from a predetermined target image is shown in the publication
- WO 2009/000528 AI described in detail.
- the relevant disclosure content of WO 2009/000528 A1 is included in the present description in this respect.
- the depressions 120 of adjacent imaged regions can be supplemented to form an extended depression region 110.
- those depression regions 110 whose dimensions exceed ⁇ in a spatial direction 30 are provided with support structures 92 in the form of cylindrical pillars (FIG. 8).
- the support structures 92 have in the embodiment of FIG. 10 on a diameter of 1.5 ⁇ each and are distributed in an area ratio of about 3% irregularly in the recessed areas 110. During the laminating process, the support structures 92 reliably prevent the adhesive layer 56 of the acceptor foil 52 from escaping to the bottom of the depression regions 110.
- the motif layer 106 formed after lamination and release winding was provided with a full-surface ink layer 112 and a full-surface metallization 114.
- Reference numeral 116 denotes further layers of the structure of the security element, for example primer, opaque white or heat-sealable layers.
- the support structures 92 and / or the lack of metallization at the location of the support structures in the recessed areas 110 are not visually discernible when viewed with the grid of spherical microlenses.
- the embossing structure of the donor olie 20 may be additionally provided in the wells with a further, finer structuring.
- a structuring is formed, for example, by diffractive microrelief structures carrying holographic information or hologram gratings for producing black structures.
- other structures such as structures with matting or scattering effect or reflective microrelief structures are possible.
- sub-wavelength gratings or nanostructures in particular moth-eye structures.
- additional stylishness (subwavelength lattice) or a blackening (moth-eye structures) are generated.
- different additional structuring can be provided in each case in the depressions of the regions of the embossed structure assigned to different desired images or in the depressions of different subregions of the embossed structure assigned to a desired image.
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Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE102012018774.2A DE102012018774A1 (de) | 2012-09-24 | 2012-09-24 | Sicherheitselement mit Darstellungsanordnung |
PCT/EP2013/002845 WO2014044402A1 (de) | 2012-09-24 | 2013-09-20 | Sicherheitselement mit darstellungsanordnung |
Publications (2)
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EP2897812A1 true EP2897812A1 (de) | 2015-07-29 |
EP2897812B1 EP2897812B1 (de) | 2017-01-11 |
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Application Number | Title | Priority Date | Filing Date |
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EP13770637.0A Active EP2897812B1 (de) | 2012-09-24 | 2013-09-20 | Sicherheitselement mit darstellungsanordnung |
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EP (1) | EP2897812B1 (de) |
DE (1) | DE102012018774A1 (de) |
WO (1) | WO2014044402A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10800201B2 (en) | 2016-03-04 | 2020-10-13 | Bundesdruckerei Gmbh | Security object having a dynamic and static window security feature and method for production |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014011425A1 (de) | 2014-07-31 | 2016-02-04 | Giesecke & Devrient Gmbh | Sicherheitselement zur Herstellung von Wertdokumenten |
WO2016065331A2 (en) | 2014-10-24 | 2016-04-28 | Wavefront Technology, Inc. | Optical products, masters for fabricating optical products, and methods for manufacturing masters and optical products |
DE102015008655A1 (de) | 2015-07-03 | 2017-01-05 | Giesecke & Devrient Gmbh | Sicherheitselement mit farbfilterndem Gitter |
US10252563B2 (en) | 2015-07-13 | 2019-04-09 | Wavefront Technology, Inc. | Optical products, masters for fabricating optical products, and methods for manufacturing masters and optical products |
DE102015009584A1 (de) | 2015-07-23 | 2017-02-09 | Giesecke & Devrient Gmbh | Sicherheitselement und Verfahren zu dessen Herstellung |
DE102015010945A1 (de) | 2015-08-19 | 2017-02-23 | Giesecke & Devrient Gmbh | Wertdokument |
CA3015684A1 (en) | 2016-04-22 | 2017-10-26 | Wavefront Technology, Inc. | Optical switch devices |
CA3073365A1 (en) | 2017-10-20 | 2019-04-25 | Wavefront Technology, Inc. | Optical switch devices |
AU2020257828A1 (en) | 2019-04-19 | 2021-10-14 | Wavefront Technology, Inc. | Optical switch devices |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
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DE102005028162A1 (de) * | 2005-02-18 | 2006-12-28 | Giesecke & Devrient Gmbh | Sicherheitselement und Verfahren zu seiner Herstellung |
ES2434443T3 (es) * | 2005-05-18 | 2013-12-16 | Visual Physics, Llc | Sistema de presentación de imágenes y de seguridad micro-óptico |
DE102007029203A1 (de) | 2007-06-25 | 2009-01-08 | Giesecke & Devrient Gmbh | Sicherheitselement |
DE102007062089A1 (de) * | 2007-12-21 | 2009-07-02 | Giesecke & Devrient Gmbh | Verfahren zum Erzeugen einer Mikrostruktur |
DE102010019766A1 (de) * | 2010-05-07 | 2011-11-10 | Giesecke & Devrient Gmbh | Verfahren zur Erzeugung einer Mikrostruktur auf einem Träger |
-
2012
- 2012-09-24 DE DE102012018774.2A patent/DE102012018774A1/de not_active Withdrawn
-
2013
- 2013-09-20 EP EP13770637.0A patent/EP2897812B1/de active Active
- 2013-09-20 WO PCT/EP2013/002845 patent/WO2014044402A1/de active Application Filing
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See references of WO2014044402A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10800201B2 (en) | 2016-03-04 | 2020-10-13 | Bundesdruckerei Gmbh | Security object having a dynamic and static window security feature and method for production |
Also Published As
Publication number | Publication date |
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WO2014044402A1 (de) | 2014-03-27 |
EP2897812B1 (de) | 2017-01-11 |
DE102012018774A1 (de) | 2014-03-27 |
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