WO2009000530A2 - Sicherheitselement mit vergrössertem, dreidimensionalen moiré-bild - Google Patents
Sicherheitselement mit vergrössertem, dreidimensionalen moiré-bild Download PDFInfo
- Publication number
- WO2009000530A2 WO2009000530A2 PCT/EP2008/005174 EP2008005174W WO2009000530A2 WO 2009000530 A2 WO2009000530 A2 WO 2009000530A2 EP 2008005174 W EP2008005174 W EP 2008005174W WO 2009000530 A2 WO2009000530 A2 WO 2009000530A2
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- WO
- WIPO (PCT)
- Prior art keywords
- image
- motif
- grid
- moire
- moiré
- Prior art date
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Classifications
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- 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
- B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
- B42D25/23—Identity cards
-
- 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
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B44—DECORATIVE ARTS
- B44F—SPECIAL DESIGNS OR PICTURES
- B44F1/00—Designs or pictures characterised by special or unusual light effects
- B44F1/08—Designs or pictures characterised by special or unusual light effects characterised by colour effects
- B44F1/10—Changing, amusing, or secret pictures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B44—DECORATIVE ARTS
- B44F—SPECIAL DESIGNS OR PICTURES
- B44F7/00—Designs imitating three-dimensional effects
-
- B42D2035/20—
Definitions
- the invention relates to a security element for security papers, value documents and the like with a micro-optical moire magnification arrangement for displaying a three-dimensional moiré image.
- Security elements for the purpose of security, which permit verification of the authenticity of the data carrier and at the same time serve as protection against unauthorized reproduction.
- the security elements can be embodied, for example, in the form of a security thread embedded in a banknote, a covering film for a banknote with a hole, an applied security strip or a self-supporting transfer element which is applied to a document of value after its manufacture.
- Security elements with optically variable elements which give the viewer a different image impression under different viewing angles, play a special role, since they can not be reproduced even with high-quality color copying machines.
- the security elements can be equipped with security features in the form of diffraction-optically effective microstructures or nanostructures, such as with conventional embossed holograms or other hologram-like diffraction structures, as described, for example, in the publications EP 0330 733 A1 or EP 0 064 067 A1.
- EP 0 238 043 A2 describes a security thread made of a transparent material, on the surface of which a grid of several parallel cylindrical lenses is embossed.
- the Thickness of the security thread is chosen so that it corresponds approximately to the focal length of the cylindrical lenses.
- the print image is designed taking into account the optical properties of the cylindrical lenses. Due to the focusing effect of the cylindrical lenses and the position of the printed image in the focal plane different subregions of the printed image are visible depending on the viewing angle. By appropriate design of the printed image so that information can be introduced, which are visible only at certain angles. Although the image can be moved around an axis parallel to the cylindrical lenses, the subject moves only approximately continuously from one location on the security thread to another location.
- US Pat. No. 5,712,731 A discloses the use of a moire magnification arrangement as a security feature.
- the security device described therein has a regular array of substantially identical printed microimages of up to 250 ⁇ m in size and a regular two-dimensional array of substantially identical spherical microlenses.
- the microlens arrangement has essentially the same pitch as the microimage arrangement. If the micro-image arrangement is viewed by the microlens array, then in the areas in which the two arrangements are substantially in register, one or more enlarged versions of the microimages are generated for the viewer.
- moir ⁇ magnification thereafter refers to a phenomenon that occurs when viewing a raster of identical image objects through a lenticular of approximately the same pitch. As with every pair of similar rasters, this results in a moire pattern, which in this case appears as an enlarged and possibly rotated image of the repeated elements of the image raster.
- the object of the invention is to avoid the disadvantages of the prior art and, in particular, to specify a security element with a micro-optical moire magnification arrangement for displaying three-dimensional moiré images with impressive optical effects.
- the three-dimensional Moire images should be able to be viewed as far as possible without limiting the field of view and should be able to be modeled in all design variants using a computer.
- a generic security element includes a micro-optical moire magnification arrangement for displaying a three-dimensional moiré image, which contains image components to be displayed in at least two moire image planes spaced apart in a direction perpendicular to the moiré magnification arrangement
- a focusing element grid arranged at a distance from the motif image for moire-magnified viewing of the motif image, which contains a periodic or at least locally periodic arrangement of a plurality of grid cells, each with a microfocusing element,
- the image components of the three-dimensional moiré image to be displayed can be formed by individual pixels, a group of pixels, lines or patches.
- those lines or patches may also be selected as image components to be displayed and the determination the associated micromotif image components and their repeated arrangement in the motif plane for the line or the sheet as a whole are performed.
- the three-dimensional moiré image by the parallax when tilting the security element for the viewer in a first height or depth above or below the plane of the security element floating and appears due to the eye distance in binocular vision in a second height or Depth above or below the level of the security element floating, wherein the first and second height or depth for almost all viewing directions differ.
- the indication of a viewing direction also includes the direction of the eye distance of the observer.
- the phrase that the first and second heights or depths differ for almost all viewing directions expresses that there may be certain excellent viewing directions in which the first and second heights and depths, respectively, coincide. In particular, these excellent viewing directions may be just the directions in which the tilt direction and Moire direction of movement coincide.
- both the grid cell arrangements of the motif image and the grid cells of the focusing element grid are arranged periodically.
- the periodicity length is preferably between 3 ⁇ m and 50 ⁇ m, preferably between 5 ⁇ m and 30 ⁇ m, particularly preferably between about 10 ⁇ m and about 20 ⁇ m.
- both the grid cell arrangements of the motif image and the grid cells of the focusing element grid are arranged locally periodically, the local period parameters changing only slowly in relation to the periodicity length.
- the local period parameters may be periodically modulated over the extent of the security element, wherein the modulation period is preferably at least 20 times, preferably at least 50 times, more preferably at least 100 times greater than the local periodicity length.
- the local periodicity length is preferably between 3 ⁇ m and 50 ⁇ m, preferably between 5 ⁇ m and 30 ⁇ m, particularly preferably between about 10 ⁇ m and about 20 ⁇ m.
- the grid cell arrangements of the motif image and the grid cells of the focusing element grid advantageously form, at least locally, respectively a two-dimensional Bravais grid, preferably a Bravais grid with low symmetry, such as a parallelogram grid.
- the use of low symmetry bravoise gratings offers the advantage that moire magnification arrangements are difficult to imitate with such Bravais gratings since, for the formation of a correct image when viewed, the lowly analyzable low symmetry of the assembly is closely replicated must become.
- the low symmetry provides a large freedom for differently selected grid parameters, which can thus be used as a hidden marking for products secured according to the invention, without this being readily apparent to a viewer on the moire-magnified image.
- any attractive effects achievable with higher-symmetry moiré magnification arrangements can also be realized with the preferred low-symmetry moiré magnification arrangements.
- the microfocusing elements are preferably formed by non-cylindrical microlenses, in particular by microlenses with a circular or polygonal limited base surface.
- the microfocusing elements can also be formed by elongated cylindrical lenses, whose longitudinal extension is more than 250 ⁇ m, preferably more than 300 ⁇ m, particularly preferably more than 500 ⁇ m and in particular more than 1 mm.
- the microfocusing elements are provided by pinhole apertures, slotted apertures, apertured apertured or slotted apertures, aspheric lenses, Fresnel lenses, GRIN lenses (Gradient Refraction Index), zone plates, holographic lenses, concave mirrors, Fresnel mirrors, zone mirrors or other elements focusing or blanking effect formed.
- the total thickness of the security element is advantageously below 50 ⁇ m, preferably below 30 ⁇ m.
- the moire image to be displayed preferably contains a three-dimensional representation of an alphanumeric string or a logo.
- the micromotif image constituents can be present in particular in a printing layer.
- the invention includes a generic security element with a micro-optical moiré magnification arrangement for displaying a three-dimensional moire image, which contains imaging components to be displayed in at least two moire image planes spaced apart in a direction perpendicular to the moire magnification arrangement
- a motif image which contains two or more, arranged at different heights, periodic or at least locally periodic lattice cell arrangements which are each assigned to a moir ⁇ image plane and which contain micromotifimage components for representing the image constituent of the assigned moire image plane,
- a focusing element grid arranged at a distance from the motif image for moire-magnified viewing of the motif image, which contains a periodic or at least locally periodic arrangement of a plurality of grid cells, each with a microfocusing element,
- the lattice cell arrangements of the motif image preferably have the same lattice periods and the same lattice orientations, so that different moire enlargements only result from the different height of the micromotif imaging components and thus a different distance between the micromotif image components and the focusing element grid ,
- the micromotif image components are available in a stamping layer in different embossing heights.
- the security element according to the invention advantageously has an opaque cover layer for covering the moire magnification arrangement in regions.
- This cover layer is advantageously in the form of patterns, characters or codes before and / or has recesses in the form of patterns, characters or codes.
- the motif image and the focusing element grid are preferably arranged on opposite surfaces of an optical spacer layer.
- the spacer layer may comprise, for example, a plastic film and / or a lacquer layer.
- the arrangement of microfocusing elements can moreover be provided with a protective layer whose refractive index preferably deviates by at least 0.3 from the refractive index of the microfocusing elements, if refractive lenses serve as microfocusing elements.
- a protective layer whose refractive index preferably deviates by at least 0.3 from the refractive index of the microfocusing elements, if refractive lenses serve as microfocusing elements.
- changes the focal length of the lenses through the protective layer which in the dimensioning of the lens radii of curvature and / or Thickness of the spacer layer must be considered.
- a protective layer also prevents the microfocusing element arrangement from easily being molded for counterfeiting purposes.
- the security element itself in both aspects of the invention preferably represents a security thread, a tear thread, a security tape, a security strip, a patch or a label for application to a security paper, document of value or the like.
- the security element may comprise a transparent or recessed area of a data medium span. Different appearances can be realized on different sides of the data carrier.
- the invention also includes a method for producing a security element having a micro-optical moire magnification arrangement for displaying a three-dimensional moiré image which contains image components to be displayed in at least two moire image planes spaced apart in a direction perpendicular to the moire magnification arrangement
- a motif image is generated which contains two or more periodic or at least locally periodic lattice cell arrangements with different lattice periods and / or different lattice orientations, each associated with a moire image plane, and those with micromotifimage components for representing the image constituent of the associated Moire image plane, a focusing element grid is generated for moire-magnified viewing of the motif image with a periodic or at least locally periodic arrangement of a plurality of grid cells, each with a micro-focusing element, and arranged at a distance from the motif image,
- the image components of the three-dimensional moiré image to be displayed can be formed by individual pixels, a group of pixels, lines or patches, with the use of individual pixels being presented as pictorial components, in particular for more complex moiré images.
- a motif image with two or more arranged at different heights motif levels is generated, each containing a periodic or at least locally periodic grid cell arrangement, which is assigned to a moire image plane and the micromotiv Image components is provided to represent the image component of the associated Moire image plane,
- a focusing element grid for moire-magnified viewing of the motif image with a periodic or at least locally periodic
- Image components and the sierelementraster be coordinated so that the enlarged, three-dimensional Moire image moves when tilting the security element for almost all tilt directions in a direction different from the tilting Moire movement direction.
- a security element having a micro-moire moire magnification arrangement for displaying a three-dimensional moiré image containing image components to be displayed in at least two moire image planes spaced in a direction perpendicular to the moiré magnification arrangement
- a periodic or at least locally periodic arrangement of microfocusing elements is determined as focussing element grid
- the micromotiv image components calculated for each image component to be displayed are assembled according to the associated grid cell arrangement to form a motif image to be arranged in the motif plane.
- step d it is advantageous to start from individual pixels of the three-dimensional moiré image as image components to be displayed and, in step d), for each of these moiré pixels an associated micromotif pixel and a grid cell arrangement for repeated arrangement of the moire image To determine the micromotif pixel in the motif layer.
- the distance of the associated moire image plane from the moiré magnification arrangement is simply given by the height of the moiré pixel above the magnification device.
- step c) a tilting direction ⁇ in which the parallax is to be observed is further specified for a reference point of the three-dimensional moiré image, as well as a desired magnification and movement behavior for this reference point and the predetermined tilting direction.
- the moire magnification factors in step d) for the other points of the three-dimensional moiré image are then related to the predetermined magnification factor for the reference point and the predetermined tilt direction.
- the desired magnification and movement behavior for the reference point is preferably in the form of the matrix elements of a transformer.
- step d) for further points (Xi, Yi, Z 1 ) of the three-dimensional moiré image, the magnification factors Vi and the associated magnifications Point coordinates in the motive plane (xi, yi) using the relationship
- e denotes the effective distance of the focus element grid from the motif plane.
- the focusing element grid is advantageously specified in step b) by a raster matrix W.
- the points of the motif plane which belong to a magnification Vi are then advantageously combined to form a microphotographic image constituent and a motif raster Ui for the periodic or at least locally periodic arrangement of this micromotif image constituent is used for this microphotographic image constituent using the relationship
- a 1 'de notes the reversing matrices.
- the focusing element grid is in the form of a two-dimensional Bravais grid with the raster matrix
- a cylindrical lens grid is moved through the raster matrix in step b)
- the lattice parameters of the Bravais lattices may be location independent.
- , Z (w, w 2) change according to the invention is slow in relation to the periodicity length. This ensures that the arrangements can always be meaningfully described locally by Bravais lattice.
- a security paper for the production of security or value documents is preferably provided with a security element of the type described above.
- the security paper may in particular comprise a carrier substrate made of paper or plastic.
- the invention also includes a data carrier, in particular a brand article, a document of value, a decorative article, such as packaging, postcards or the like, with a security element of the type described above.
- the security element can in particular in a window area, ie a transparent or recessed area of Data carrier be arranged.
- FIG. 1 is a schematic representation of a banknote with an embedded security thread and a glued transfer element
- FIG. 7 shows in (a) a motif image constructed according to the invention and in (b) a schematic section of the three-dimensional moiré image resulting from viewing the motif image of (a) with a suitable hexagonal lenticular grid,
- FIG. 8 shows in (a) a motif image with ortho-parallactic motion behavior constructed according to the invention, and in FIG. (B) a schematic section of the three-dimensional moire image resulting from viewing the motif image of (a) with a suitable rectangular lenticular grid.
- 9 shows in (a) a motive image with oblique motion behavior constructed according to the invention and in (b) schematically a section of the three-dimensional moiré image resulting from viewing the motif image of (a) with a suitable rectangular lenticular image, and FIG
- Magnification arrangement for illustrating the occurrence of different magnifications at motif levels at different depths di, d 2 .
- FIG. 1 shows a schematic representation of a banknote 10 which is provided with two security elements 12 and 16 according to exemplary embodiments of the invention.
- the first security element represents a security thread 12 that emerges in certain window areas 14 on the surface of the banknote 10, while it is embedded in the intervening areas inside the banknote 10.
- the second security element is formed by a glued transfer element 16 of any shape.
- the security element 16 can also be designed in the form of a cover film, which is arranged over a window area or a through opening of the banknote.
- the security element may be designed for viewing in supervision, review or viewing both in supervision and in review. Bilateral designs are also possible in which lenticular screens are arranged on both sides of a motif image.
- Both the security thread 12 and the transfer element 16 may comprise a moire magnification arrangement according to an embodiment of the invention. included. The mode of operation and the production method according to the invention for such arrangements will be described in more detail below with reference to the transfer element 16.
- Fig. 2 shows schematically the layer structure of the transfer element 16 in cross section, wherein only the parts of the layer structure required for the explanation of the functional principle are shown.
- the transfer element 16 includes a carrier 20 in the form of a transparent plastic film, in the embodiment of an approximately 20 micron thick polyethylene terephthalate (PET) film.
- PET polyethylene terephthalate
- the upper side of the carrier film 20 is provided with a grid-like arrangement of microlenses 22 which form on the surface of the carrier film a two-dimensional Bravais grid with a preselected symmetry.
- the Bravais lattice may, for example, have a hexagonal lattice symmetry, but because of the higher security against forgery, preferred are lower symmetries and thus more general shapes, in particular the symmetry of a parallelogram lattice.
- the spacing of adjacent microlenses 22 is preferably chosen as small as possible in order to ensure the highest possible area coverage and thus a high-contrast representation.
- the spherically or aspherically configured microlenses 22 preferably have a diameter between 5 .mu.m and 50 .mu.m and in particular a diameter between only 10 .mu.m and 35 .mu.m and are therefore not visible to the naked eye. It is understood that in other designs, larger or smaller dimensions come into question.
- the Moire magnifier structures for Moire magnifier structures may have a diameter of between 50 ⁇ m and 5 mm, while Moir® Magnifier structures can only be deciphered with a magnifying glass or a microscope should also dimensions below 5 microns can be used.
- a motif layer 26 is arranged, which contains two or more likewise grid-shaped grid cell arrangements with different grating periods and / or different grating orientations.
- the grid cell arrangements are each formed from a plurality of grid cells 24, wherein in FIG. 2, for the sake of clarity, only one of these grid cell arrangements is shown. Designs having multiple grid cell arrays are shown, for example, in Figs. 5, 7 (a), 8 (a) and 9 (a).
- the moiré magnification arrangement of Figure 2 produces for the viewer a three-dimensional moiré image, that is, a moiré image containing image constituents in at least two moiré image planes spaced in a direction perpendicular to the moiré magnification arrangement ,
- each of the grid cell arrangements of the motif layer 26 is assigned in each case to one of the moire image planes, and the grid cells 24 of this grid cell arrangement contain micromotif image components 28 for representing the image constituent of this moire image plane.
- the motif lattices also form two-dimensional Bravais lattices with a preselected or calculated symmetry, again assuming a parallelogram lattice.
- the Bravais grid of the grid cells 24 differs slightly in its symmetry and / or in the size of its grid parameters from the Bravais grid of the microlenses 22 in order to obtain the desired moiré magnification effect.
- the grating period and the diameter of the grid cells 24 are in the same order of magnitude as those of the microlenses 22, that is preferably in the range of 5 microns to 50 microns and in particular in the range of 10 .mu.m to 35 .mu.m, so that even the micromotif image constituents 28 themselves unrecognizable to the naked eye.
- the grid cells 24 are correspondingly larger or smaller.
- the optical thickness of the carrier film 20 and the focal length of the microlenses 22 are coordinated so that the motif layer 26 is located approximately at a distance of the lens focal length.
- the carrier foil 20 thus forms an optical spacer layer which ensures a desired, constant spacing of the microlenses 22 and the motif layer with the micromotif image constituents 28.
- the observer sees a slightly different subarea of the micromotif image constituents 28 when viewed from above through the microlenses 22, so that the large number of microlenses 22 as a whole produces an enlarged image of the micromotives.
- the resulting moire magnification depends on the relative difference of the lattice parameters of the Bravais lattice used. If, for example, the grating periods of two hexagonal grids differ by 1%, the result is a 100-fold moire magnification.
- three-dimensional moiré images are shown which, when the moire magnification arrangement is tilted, move in a direction which differs from the tilting direction.
- the visual spatial impression and the spatial experience due to the tilting movement are not in harmony with each other or even contradict each other, resulting in striking, sometimes dizzying effects with high attention and recognition value for the viewer ,
- FIGS. 3 and 4 schematically show a moire magnification arrangement 30, not shown to scale, with a motif plane 32 in which the motif image with the micromotif image constituents is arranged, and with a lens plane 34 in which the microlens grid is located.
- the moiré magnification assembly 30 generates two or more moiré image planes 36, 36 '(two are shown in FIG. 3) describing the magnified three-dimensional moiré image 40 (FIG. 4) perceived by the viewer 38.
- the arrangement of the micromotif image constituents in the motif plane 32 is described by two or more two-dimensional Bravais lattices whose unit cells are represented by vectors w, and U 2 (with the components w,, W 21 and, respectively, 12 , w 22 ) can be. For the sake of clarity, one of these unit cells is picked out and shown in FIG.
- the associated motif raster matrices are distinguished below by their indices Ui, U2,....
- the arrangement of microlenses in the lens plane 34 is described by a two-dimensional Bravais lattice whose unit cell (u with the components w, w 21 and w n, w 22) by the vectors vP, and w 2 is specified.
- the unit cell in one of the moire image planes 36, 36 ' is described.
- the three-dimensional moiré images in order to fully describe a moiré pixel, in addition to the two-dimensional position of the dot in one of the image planes, it is also necessary to specify in which moire image plane a pixel lies. This is done in the context of this description by the indication of the Z component of the moire pixel, ie the perceived flying height of the pixel above or below the plane of the moiré magnification arrangement, as shown in FIGS. 3 and 4.
- lenses 22 instead of lenses 22, it is also possible, for example, to use pinholes on the principle of the pinhole camera.
- all other types of lenses and imaging systems such as aspherical lenses, cylindrical lenses, slit diaphragms, mirrored apertured or slit apertures, Fresnel lenses, GRIN lenses (Gradient Refraction Index), zone plates (diffractive lenses), holographic lenses, concave mirrors, Fresnel mirrors, Zone mirrors and other elements with focussing or even fading effect can be used as microfocusing elements in the focussing element grid.
- elements with ausblendender effect can be used as Mikrofokussierimplantation in sierelementraster.
- the viewer looks through the partially transparent in this case motif image on the mirror array behind it and sees the individual small mirror as light or dark spots from which builds the image to be displayed.
- the motif image is generally so finely structured that it can only be seen as a veil.
- the described formulas for the relationships between the moire image to be displayed and the motif image apply, even if this is not mentioned in detail, not only for lenticular but also for mirror images. gelraster. It is understood that in the inventive use of concave mirrors at the location of the lens focal length, the mirror focal length occurs.
- FIG. 2 When using a mirror array according to the invention instead of a lens array, the viewing direction from below is to be considered in FIG. 2, and in FIG. 3 the planes 32 and 34 are interchanged with one another in the mirror array arrangement.
- the further description of the invention is based on lens grids, which are representative of all other inventively used sierelementraster.
- Each motif grid U that is to say each of the different grid cell arrangements of the motif plane 32, is assigned exactly one of the moire image planes 36, 36 '.
- the moiré image grating f of this associated moire image plane 36 results from the grating vectors of the motif plane 32 and the lens plane 34
- R W - (W -Uy 1 - (F - F 0 ) can be determined from the pixels of the motif plane 32.
- the transformation matrix A W • (W - B) ⁇ ], which transforms the coordinates of the points of the motif plane 32 and the points of the moiré image plane 36 in one another,
- the transformation matrix ⁇ describes both the moiré magnification and the resulting movement of the enlarged moiré image when the moire-forming arrangement 30 moves, as opposed to the movement of the motif plane 32 the lens plane 34 is derived.
- the raster matrices T, U, W, the unit matrix I and the transformation matrix A are often subsequently also written without a double arrow, if it is clear from the context that these are matrices.
- the three-dimensional extent of the depicted moiré image 40 is taken into account by the specification of an additional coordinate which indicates the distance in which a moiré pixel above or below the plane of the moire. Magnification arrangement seems to float. If v is the moire magnification and e is an effective distance of the lens plane 34 from the motive plane 32, in which not only the physical distance d but also the lens data and the refractive index of the medium between the lens raster and the motif raster are considered heuristically, then the Z is Component of a moire pixel given by
- a three-dimensional Moire image 40 ie an image with different Z values, can now be generated in two different ways according to equation (1).
- the former approach will be described in more detail below in connection with FIG. 10, the latter being based on the following description of FIGS. 3 to 9.
- a moire magnification V 1 is realized for the image components in the image plane 36 (upper side 42 of the letter "P") by a suitably selected motif grid U 1 , and for the image components in the image plane 36 '(lower side 44 of the letter "P").
- transformation matrices A which describe a pure magnification, ie no rotation or distortion.
- FIG. 5 shows dashed arrows 50 in the motif plane 32 as first micromotif elements, which are arranged in a first motif grid U 1 with a grating period P 1 and which shows arrows 52 drawn through as second micromotif elements which are arranged at the same effective distance d from the lens plane 34 in a second motif grid U2 with a slightly larger grating period p2. Due to the different grating periods and the resulting different magnification factors V 1 and V 2 according to equation (1), the resulting enlarged moiré images 54 and 56 hover above the plane of the moiré, respectively, at different heights Zi, Z 2. magnifying arrangement.
- the different magnification factors must also be taken into account when designing the micromotif elements 50, 52. If, for example, the enlarged arrow images 54 and 56 appear to be of equal length, the dashed arrows 50 in the motif plane 32 must be correspondingly reduced in comparison with the solid arrows 52 in order to compensate for the higher magnification factor in the moiré image.
- the transformation matrices Ai contain a respective matching component A 1 , which describes twists and distortions, and the respective different magnification factors Vi for the image planes:
- the parallel slices Z, in the moire motif corresponding motif pixels can be arranged in corresponding motif grids Ui to be created uniformly.
- two effects contribute to a three-dimensional image effect for a viewer, which are referred to as “two-eyed vision” or “movement behavior”.
- Magnifier is designed so that a lateral tilting of the arrangement leads to a lateral displacement of the pixels. Because of the lateral "tilt angle" of about 15 ° between the eyes at a normal viewing distance of about 25 cm, seen in the eyes since laterally displaced pixels are interpreted by the brain as if the pixels were before or after the direction of lateral displacement behind the actual substrate plane, more or less high or low depending on the size of the shift.
- the columns of the transformation matrix A can be interpreted as vectors:
- the vector 5, indicates in which direction the resulting moi- re-image moves, considering the arrangement of motif grid and lenticular
- the vector a 2 indicates in which direction the resulting moire image moves when you place the arrangement of motif grid and lens raster tilts forward / backward.
- the direction of movement is defined as follows:
- Reference direction for example, the horizontal W, moves, if the arrangement does not move in one of the preferred directions laterally (0 °) or forward / backward (90 °), but in a general, indicated by an angle ⁇ to the reference direction W direction k is given by
- the above explanations relate first to the relationships for a motif point, a motive point set or a motif part with a single depth component Z.
- motif points or subject parts in different depths Zi, Z 2 ...., provided for different depths motivational points or parts in the motif plane according to the invention arranged in changed screen rulings with modified transformation matrix A 1 , A2 ....
- the magnification factor Vi of the different parts of the subject can in each case be based on the magnification factor v in the tilting direction
- Equation (3c) and the original transformation matrix A be obtained:
- the transformation matrix A and a tilting direction ⁇ are provided, under which the parallax is to be observed.
- a motif image is formed in one motif plane periodic or at least locally periodic arrangement of a plurality of grid cells with micromotif images generated parts and a sierele- mentraster for moire magnified viewing of the motif image with a periodic or at least locally periodic arrangement of a plurality of grid cells each with a Mikrofokussierelement and arranged spaced from the motif image.
- micromotif image parts are in this case formed such that the micromotif image parts of a plurality of spaced grid cells of the motif image taken together form in each case a micromotif element that corresponds to one of the moire image elements of the enlarged moire image and whose extent is greater than a grid cell of the motif image.
- Moire magnifier are described with cylindrical lens grid and / or with in any direction arbitrarily extended motifs. Moire magnifiers of this type can also be embodied as 3D Moir ⁇ magnifiers.
- FIG. 6 (a) shows a simple three-dimensional motif 60 in the form of a letter "P" cut from a plate.
- Fig. 6 (b) shows a representation of this motif through only two parallel image planes containing the top 62 and the bottom 64 of the three-dimensional letter motif
- Fig. 6 (c) shows the illustration of the motif through five parallel slices and with five slices 66 of the letter motif.
- Fig. 7 shows an embodiment for which a hexagonal lenticular grid W is given.
- an O-shaped ring is selected which, as in FIG. 6 (b), is described in two image planes by a letter top and a letter bottom.
- the motif grid for the motif grid is obtained using the relationships (6b) and (7) described above
- FIG. 7 (a) shows the motif image 70 constructed in this way, in which the different screen widths of the two micromotif elements "ring top” and “ring bottom” can be clearly seen. If the motif image 70 of FIG. 7 (a) is viewed with the said hexagonal lenticular grid, a three-dimensional moiré image floating below the moiré magnification arrangement results, of which a section is shown schematically in FIG. 7 (b) ,
- a plurality of juxtaposed rings 74, 76 can be seen. If you look at the arrangement from the front, you can see the middle ring 74 from the front and the surrounding rings 76 obliquely from the corresponding side. If you tilt the arrangement, you can see the middle ring 74 obliquely from the side, the adjacent rings 76 change according to their perspective.
- Fig. 8 shows an embodiment with orthoparallaktischer movement, for which a rectangular lens grid W is selected.
- the three-dimensional motif to be represented is a letter "P" cut from a plate, as shown in FIG.
- transformation matrices Ai become the matrices given, in addition to a magnification by a factor Vi an orthopar- rallaktisches movement behavior when tilting the moire magnification arrangement describe.
- Equation (6a) then arises in the form
- the desired motif size (letter height) is 35 mm
- the effective lens image size again e 4 mm
- the lens spacing in the right-angled lenticular grid should be 5 mm.
- the motif grid Ui for the top surfaces results to the motif grid U2 for the underside surfaces too
- FIG. 8 (a) shows the motif image 80 thus constructed, in which the two different motif grids U 1 , U 2 of the two micromotif elements "letter top side” and “letter bottom side” can be clearly seen. If the motif image 80 of FIG. 8 (a) is viewed with said rectangular lenticular grid, the result is a three-dimensional moiré image 82 floating above the moiré magnification arrangement, of which a section is shown schematically in FIG. 8 (b).
- the embodiment of FIG. 9 is based on a letter "P" cut from a plate as the three-dimensional motif to be displayed. This motif is intended to move obliquely in this embodiment when tilting the Moire magnification arrangement.
- Equation (6a) then arises in the form
- the desired motif size (letter height) should be 35 mm
- the effective lens image width e 4 mm
- FIG. 9 (a) shows the motif image 90 thus constructed, in which the two different motif grids U 1 , U 2 of the two micromotif elements "letter top” and “letter bottom” and the distortion of the motif elements can be clearly seen. If the motif image 90 of FIG. 9 (a) is viewed with said rectangular lenticular grid, a three-dimensional moire image 92 hovering below the moiré magnification arrangement results, of which a section is shown schematically in FIG. 9 (b).
- Example 4 is a modification of Example 3, and its dimensions are such that it is particularly suitable for security threads of banknotes.
- the Moire image used (letter "P") and the transformation matrices Ai correspond to those of Example 3.
- E 0.04 mm is chosen as the effective lens image width and 0.04 mm as the lens pitch in the rectangular lenticular grid.
- the motif grid U 1 for the top surfaces results to
- the motif elements that are created in these grids are also compared to the desired target motif by the transformation
- FIG. 10 shows two motif planes 32, 32 ', which are provided at different depths d i, d 2 of the moire magnification arrangement. Dashed arrows 50 are shown in the motif plane 32 as the first micromotif elements, and arrows 52 in the underlying motif plane 32 'are drawn through as second micromotif elements. Both the first and the second micromotif elements 50, 52 are arranged in the same motif grid U with grating period u.
- the resulting enlarged moiré images 54 and 56 therefore appear to the viewer 38 due to the coincident grating periods with the same magnification factor v, so that the arrows 50, 52 are formed to be equally long for enlarged arrow images 54 and 56 of equal length.
- the different flying height Z 1 , or Z 2 above the plane of the moire magnification arrangement results in this embodiment from the different distance di, ⁇ i and thus also a different effective distance ei, e2 between the lens plane 34 and the motif plane 32 and 32nd ':
- Such a design can be realized with motif elements 50, 52 at different depths, for example by embossing the corresponding structures in a lacquer layer.
- the effective distances ei, e 2 effective for the flying height Z can be determined in each case from the physical distances ⁇ ⁇ , ⁇ i, the refractive index of the optical distance layer and of the lens material and the lens focal length.
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- Business, Economics & Management (AREA)
- Accounting & Taxation (AREA)
- Finance (AREA)
- Credit Cards Or The Like (AREA)
- Printing Methods (AREA)
- Controls And Circuits For Display Device (AREA)
- Stereoscopic And Panoramic Photography (AREA)
- Processing Or Creating Images (AREA)
- Holo Graphy (AREA)
- Facsimile Scanning Arrangements (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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EP08759342.2A EP2164713B1 (de) | 2007-06-25 | 2008-06-25 | Sicherheitselement mit vergrössertem, dreidimensionalen moiré-bild |
US12/665,834 US8400495B2 (en) | 2007-06-25 | 2008-06-25 | Security element |
AU2008267368A AU2008267368B2 (en) | 2007-06-25 | 2008-06-25 | Security element having a magnified, three-dimensional moire image |
CN2008800218678A CN101711203B (zh) | 2007-06-25 | 2008-06-25 | 具有放大的三维摩尔图像的安全元件 |
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DE102007029204A DE102007029204A1 (de) | 2007-06-25 | 2007-06-25 | Sicherheitselement |
DE102007029204.1 | 2007-06-25 |
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WO2009000530A2 true WO2009000530A2 (de) | 2008-12-31 |
WO2009000530A3 WO2009000530A3 (de) | 2009-04-30 |
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PCT/EP2008/005171 WO2009000527A1 (de) | 2007-06-25 | 2008-06-25 | Darstellungsanordnung |
PCT/EP2008/005174 WO2009000530A2 (de) | 2007-06-25 | 2008-06-25 | Sicherheitselement mit vergrössertem, dreidimensionalen moiré-bild |
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PCT/EP2008/005171 WO2009000527A1 (de) | 2007-06-25 | 2008-06-25 | Darstellungsanordnung |
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EP (2) | EP2164711B1 (de) |
CN (2) | CN101687427B (de) |
AU (2) | AU2008267365B2 (de) |
DE (1) | DE102007029204A1 (de) |
RU (2) | RU2466875C2 (de) |
WO (2) | WO2009000527A1 (de) |
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Also Published As
Publication number | Publication date |
---|---|
DE102007029204A1 (de) | 2009-01-08 |
RU2466030C2 (ru) | 2012-11-10 |
AU2008267368B2 (en) | 2013-04-18 |
CN101687427A (zh) | 2010-03-31 |
EP2164713B1 (de) | 2016-04-06 |
RU2010101423A (ru) | 2011-07-27 |
CN101687427B (zh) | 2012-01-18 |
US20100208036A1 (en) | 2010-08-19 |
CN101711203A (zh) | 2010-05-19 |
AU2008267365A1 (en) | 2008-12-31 |
US20100177094A1 (en) | 2010-07-15 |
CN101711203B (zh) | 2013-03-13 |
RU2466875C2 (ru) | 2012-11-20 |
AU2008267368A1 (en) | 2008-12-31 |
RU2010101424A (ru) | 2011-07-27 |
US8400495B2 (en) | 2013-03-19 |
AU2008267365B2 (en) | 2013-04-04 |
EP2164713A2 (de) | 2010-03-24 |
EP2164711B1 (de) | 2016-06-01 |
US8878844B2 (en) | 2014-11-04 |
EP2164711A1 (de) | 2010-03-24 |
WO2009000527A1 (de) | 2008-12-31 |
WO2009000530A3 (de) | 2009-04-30 |
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