EP1797539A1 - Document de securite a fenetres transparentes - Google Patents

Document de securite a fenetres transparentes

Info

Publication number
EP1797539A1
EP1797539A1 EP05783032A EP05783032A EP1797539A1 EP 1797539 A1 EP1797539 A1 EP 1797539A1 EP 05783032 A EP05783032 A EP 05783032A EP 05783032 A EP05783032 A EP 05783032A EP 1797539 A1 EP1797539 A1 EP 1797539A1
Authority
EP
European Patent Office
Prior art keywords
microlens
microlenses
security document
document according
optical element
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
Application number
EP05783032A
Other languages
German (de)
English (en)
Other versions
EP1797539B1 (fr
Inventor
Andreas Schilling
Wayne Robert Tompkin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
OVD Kinegram AG
Original Assignee
OVD Kinegram AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by OVD Kinegram AG filed Critical OVD Kinegram AG
Publication of EP1797539A1 publication Critical patent/EP1797539A1/fr
Application granted granted Critical
Publication of EP1797539B1 publication Critical patent/EP1797539B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • B42D25/30—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
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/29—Securities; Bank notes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/328—Diffraction gratings; Holograms
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/003—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using security elements
    • G07D7/0032—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using security elements using holograms
    • B42D2033/24—
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S283/00—Printed matter
    • Y10S283/901—Concealed data

Definitions

  • the invention relates to a security document, in particular a banknote or identity card, having a first optical element and a transparent window, in which a second optical element is arranged, wherein the first and the second optical element so spaced apart on a support of the security document are that the first and the second optical element can be brought into coincidence with each other.
  • EP 0 930 979 B1 discloses a self-checking banknote consisting of a flexible plastic carrier.
  • the flexible plastic support is made of a transparent material and is provided with a clouded sheath, leaving a clear transparent surface as a window.
  • an enlarging lens is arranged as a verification means. Furthermore, a microprint area is provided on the banknote, which shows a small character, a fine line or a filigree pattern. For examination or
  • EP 0 930 979 B1 it is proposed in EP 0 930 979 B1 to arrange a distorting lens, an optical filter or a polarization filter in the transparent window.
  • the invention is based on the object of specifying an improved security document.
  • This object is achieved by a security document provided with a first transparent window, in which a first optical element is arranged, and with a second transparent window, in which a second optical element is arranged, in which the first transparent window and the second transparent window being spaced apart on a support of the security document such that the first and second optical elements can be brought into registration with each other and wherein the first optical element is a first transmissive microlens array and the second optical element is a second transmissive Having microlens field, wherein when overlapping the second with the first microlens field shows a first optical effect.
  • Security document by means of clear and distinctive security features. This makes it possible by means of the invention to produce easily verifiable and difficult to imitate security documents.
  • the lens spacing of the microlenses of the first microlens field and the lens spacing of the microlenses of the second microlens array are selected such that the individual light bundles of the light beam split by the overlapping microlens fields meet in a common pixel.
  • Lens spacing of the microlenses is understood to be the lateral spacing of the microlenses of the respective microlens field. This will achieve that the overlapping of the two microlens fields produces an integral image, and thus the overall system behaves more or less like a single macroscopic lens, the properties of which however differ significantly from those of a conventional macroscopic lens. With such a system, both real and virtual images can be generated, single images but also multiple images.
  • the lens spacing of the microlenses of the two microlens arrays is preferably selected such that the change in the offset of the mutually associated lenses of the first and second microlens arrays is constant from the optical axis of the virtual macroscopic lens.
  • This is achieved according to a preferred embodiment of the invention by two microlens fields, in which the microlenses each spaced according to a periodic grid with a constant lens spacing and in this case the lens pitch of the microlenses of the first microlens field of the lens pitch of the microlenses of the second Microlens field distinguishes.
  • Such microlens fields are particularly easy to manufacture.
  • the lens spacing of the microlenses of the first microlens field is preferably an integer multiple of the lens spacing of the microlenses of the second microlens field.
  • the diameter of the microlenses smaller than the resolution of the human eye, so that the lens spacing of the microlenses of the first and second microlens fields preferably smaller than 300 microns is to choose. Furthermore, the focal length of the microlenses is small compared to the image and object width.
  • the Kepler telescope type in imaging the plurality of split light bundles interact.
  • a macroscopic lens system similar optical effect can be achieved, however, which exhibits properties that are significantly different from those of a conventional lens system. It can be so particularly striking and thus memorable optical effects.
  • first microlens array of a plurality of positive-focus microlenses and the second microlens array of a plurality of negative-focus microlenses which cooperate in the manner of a Gallileo telescope.
  • superimposing the first and second microlens fields produces effects similar to those of a macroscopic lens, but different from a conventional macroscopic lens system.
  • the two microlens fields are not homogeneous and have locally different parameters such as lens spacing, diameter of the lenses or focal length of the lenses.
  • One or more parameters of the first and / or the second microlens field preferably change periodically according to a (common) raster. Furthermore, parameters of the microlens fields can also vary virtually continuously in a predefined manner.
  • the microlens field has two or more regions with different lens pitches of the microlenses and / or with different focal lengths of the microlenses.
  • the resulting imaging function differs in first and second areas, thereby making the information encoded in the change in parameters of the microlens fields visible to the viewer.
  • the measures described above for coding additional information into the first and second microlens field further improve the security against forgery of the security document.
  • the security element has an opaque third optical element, wherein, when the first and / or the second microlens field is covered with the third optical element, one or more further optical effects are exhibited.
  • additional security features can thus be achieved by covering the microlens fields, e.g. be generated with a reflective optically variable element or with a high-resolution pressure, the microlens field can serve as a moire analyzer, for example.
  • the first and / or the second optical element each consist of two partial microlens fields, which are arranged one above the other in the first and second optical element.
  • the two partial microlens fields are thus arranged, for example, on opposite sides of a film and thus form superimposed microlens surfaces of a film.
  • the one surface of the first optical element is determined by the geometry of the one partial microlens field and the surface of the first optical element lying opposite this surface is determined by the geometry of the other partial microlens field.
  • the optical effect generated when the first and second optical elements are superimposed depends on the geometry Orientation of the first and second optical element, that is, depending on whether the security document is folded or bent in one direction or the other in order to bring the transparent window in the cover.
  • a similar effect can also be achieved by arranging the microlens fields in the transparent windows of the security document in such a way that the distance between the lenses of the two microlens fields changes depending on the folding or bending direction.
  • the first and / or the second optical element has a
  • Replizierlack Anlagen into which a relief structure is formed which forms the first and the second microlens field. Furthermore, an encapsulation of the relief structure by means of an additional optical separation layer and / or an impression of the relief structure by means of UV replication has proved to be advantageous.
  • the microlenses of the first and / or second microlens field are preferably formed by a diffraction-optically effective relief structure which generates the effect of a microlens field by diffractive optical means.
  • diffractive lenses can be formed by a diffractive binary relief structure whose profile depth is smaller than the wavelength of the visible light (binary, thin diffractive lens), formed by a continuous diffractive relief profile with a profile depth smaller than the wavelength of the visible light ( thin diffractive lens with continuous profile) and a diffractive continuous relief profile with a profile depth greater than the wavelength of the visible light (thick diffractive lens with continuous relief profile), however, it is also possible to use the microlens field as a refractive macrostructure in the The profile depth of this macrostructure is in this case many times greater than the wavelength of the visible light.
  • the first and / or the second optical element is formed by the transfer layer of a transfer film. This makes it possible to To meet the requirements of the quality of the microlens fields and the tolerances in terms of distances, flatness, etc.
  • Fig. 1 shows an illustration of an inventive
  • FIG. 3a shows a schematic illustration of two overlapping microlens fields of the security document according to FIG. 1.
  • Fig. 3b shows a sketch to illustrate the overlap of the
  • FIG. 3c shows a schematized plan view of a microlens field.
  • FIG. 4 shows a sectional view of a section of the security document according to FIG. 1.
  • FIG. 5 shows a schematic representation of another security document according to the invention.
  • FIG. 6 shows a schematic representation of another security document according to the invention.
  • the value document 1 shows a value document 1, for example a banknote or a check.
  • the value document 1 it is also possible for the value document 1 to represent an identification document, for example an identity card.
  • the security document 1 consists of a flexible carrier 11 with transparent windows 12 and 13.
  • the carrier 11 is preferably a carrier made of paper material which is provided with an imprint and in which further security features, for example watermarks or security threads, are introduced. Window-shaped apertures are then introduced into this paper carrier, for example by punching or by means of a laser, so that the transparent windows 12 and 13 shown in FIG. 1 are formed.
  • the transparent windows 12 and 13 are then resealed by optical elements having a transmissive microlens array.
  • a first transmissive microlens field 15 and in the region of the transparent window 13 a second transmissive microlens field 16 are arranged.
  • the carrier 11 is a
  • a transparent or partially transparent material is already used as the material for the carrier 11, and thus the carrier need not be partially removed by punching or cutting to generate the transparent windows 12 and 13.
  • the carrier 11 consists of a transparent plastic film which is not provided with a haze layer in the region of the transparent windows 12 and 13.
  • the carrier 11 - for example in the case of a passport - consists of two connected by stitching or gluing pages.
  • a strip-shaped patch 14 is further applied to the carrier 11, which covers the region of the transparent window 13.
  • the transparent microlens array 16 is inserted in the patch 14.
  • the patch 14 is preferably the transfer layer of a transfer film, for example a hot stamping foil, which is bonded to the carrier 11 under the action of pressure and heat by means of an adhesive layer.
  • the patch 14 may also have one or more further optical elements, for example the further optical element 17 shown in FIG.
  • the transparent window 12 is not placed on the position shown in Fig. 1 in the carrier 11, but also in the region of the strip-shaped patch 14 is incorporated in the carrier 11 and the strip-like patch so both transparent window 12th and 13 covers. Both microlens fields 15 and 16 can thus be introduced into a common film element, which significantly reduces the production of the value document 1.
  • the security document 1 can also have further security features, for example applied by means of a transfer film, which can be brought into overlap with the transparent windows 12 and 13 by bending, folding or twisting the carrier 11.
  • Fig. 1 shows an example another optical element 18, which is preferably a reflective, optically variable element or a security imprint.
  • the transparent windows 12 and 13 of the carrier 11 are brought into the overlap, for example by folding the carrier 11, so that the microlens fields 15 and 16, as shown in FIG. 2, overlap. Then the optical effect which results when viewed through the two superimposed microlens fields 15 and 16 is checked.
  • an object 2 lying in the viewing direction 2 any desired graphic representation or a special verification pattern by the transmissive microlens fields 15 and 16 is considered.
  • an optical element of the security document 1 is placed in the viewing direction and viewed through the transparent microlens fields 15 and 16.
  • FIG. 3 a shows a section of the microlens fields 15 and 16, which are spaced apart from one another by a distance d in accordance with the viewing situation according to FIG. 2.
  • the microlens array 15 consists of a multiplicity of microlenses 21 which are arranged next to one another, as indicated in FIG. 3c.
  • the microlens array 16 consists of a multiplicity of microlenses 22. If now two mutually associated lenses 21 and 22, which are spaced apart from an imaginary optical axis of the system formed by the microlens arrays 15, 16 by a distance r, are considered have their parallel optical axes a deviation ⁇ r .
  • the parallel light rays incident at an angle ex become one dot f / a being away from the axis of the lens 21, where / i is the focal length of the lens 21. Due to the offset ⁇ r between the lenses 21 and 22, the light beam then passes through the lens 22 at an angle ⁇
  • / 2 is the focal length of the lens 22.
  • the focal length F of the imaging system formed by the microlens fields 15 and 16 is constant if the derivative dAr / dr is constant, which is the case, for example, when the microlenses of the microlens fields 15 and 16 with a constant, differing lens spacing are spaced from each other.
  • the microlenses 21 and 22 are each spaced apart from each other by a constant lens pitch pi and p 2 and, as shown in FIG. 3c, are aligned with each other according to a periodic grid. If this condition is met, an integral image is generated and the imaging function of the system shown in Fig. 3a is similar to that of a conventional lens system consisting of two macroscopic lenses.
  • FIG Fig. 3b results from FIG Fig. 3b scenario shown the following relationships:
  • FIG. 3b shows the microlens fields 15 and 16, a point on the optical axis spaced at a distance g from the microlens array 16, which is imaged by the first microlens array onto a set of points different from the microlens array.
  • Field a distance Si are removed and have a lateral distance y ". These points are distant from the microlens array 16 a distance S2 and are imaged at a distance b to a point on the optical axis.
  • the focal length of the system will be one focal length when the microlens field 15 is incident on the light
  • the imaging function generated by the microlens fields 15 and 16 thus has the following features in the case of the use of microlenses of positive focal length for the microlens fields 15 and 16 (Kepler telescope) compared to a "conventional" lens system:
  • microlenses of the microlens array 15 have a positive focal length and the microlenses of the microlens array 16 have a negative focal length (Gallileo telescope)
  • the following differences arise compared to the imaging function of a conventional lens:
  • the sign of the focal length of the system does not change - as in a conventional lens - when the system is rotated. However, the focal length still depends on the viewing direction.
  • the system behaves like a conventional lens, where the object is in a medium with a refractive index / 1 // 2.
  • microlens fields for the microlens fields 15 and 16, which fulfill the conditions described above and thus their By cooperating to generate an optical function similar to a conventional lens, it is also possible to use microlens fields which do not fulfill the above-mentioned conditions. It is thus possible, for example, for the lens spacing of the microlenses of one or both microlens fields to change continuously in certain regions, resulting in interesting and impressive distorting effects. It is likewise possible for the focal length of the microlenses of a microlens field to be changed continuously at least in a region of the microlens field, as a result of which such distorting effects can likewise be achieved.
  • the resulting imaging function changes with lateral displacement of the two microlens fields 15 and 16 to each other , which can serve as another security feature in the verification of the security document 1.
  • microlens arrays 15 and 16 in which the focal length of the microlenses and the spacing of the microlenses is constant but different from adjacent areas. If only one of the two microlens fields 15 and 16 is configured in this way, the result is an imaging function which corresponds to the several juxtaposed different conventional lenses.
  • the optical mapping function valid in the individual sections is defined here by the relationships described above. If both microlens fields 15 and 16 are configured in this way, the optical imaging function changes with lateral displacement of the two microlens arrays 15 and 16 relative to one another, which can be used as a further security feature for verification of the security document.
  • the lens spacing of the microlens fields 15 and 16 is preferably chosen so that the partial beams generated by the splitting of the incident light beam have a diameter which is below the resolution of the human eye.
  • the distance of the microlens fields 15 and 16 is therefore preferably in a range between 250 ⁇ m and 25 ⁇ m. This ensures that the integral image generated by the microlens fields 15 and 16 has a good resolution. If small demands are placed on the optical quality of the imaging function generated by the microlens fields 15 and 16, then it is also possible to increase the lens spacing of the microlenses of the microlens fields 15 and 16.
  • Fig. 4 shows the carrier 11, which consists of a paper material of a thickness of about 100 microns and in the region of the transparent window 12 has an opening produced by means of a punching or cutting operation.
  • a film element 20 is preferably applied under heat and pressure to the paper material of the carrier 11 by an adhesive layer of the film element 20 is activated by heat and pressure. As a result of the pressure exerted, the depression shown in FIG. 4 is simultaneously created in the region of the optical element 20.
  • the film element 20 consists of a carrier film 22, an adhesion promoter layer 23, a replication lacquer layer 24, an optical separation layer 25 and an adhesive layer 26.
  • the carrier film 22 consists of a PET or BOPP film with a layer thickness of 10 to 200 ⁇ m.
  • the function of the carrier film 22 is to provide the necessary stability for bridging the opening of the carrier 11.
  • the adhesion promoter layer 23 has a thickness of 0.2 to 2 ⁇ m and is applied to the carrier film 22 by means of a printing process.
  • the replication lacquer layer 24 consists of a thermoplastic or crosslinked polymer in which a relief structure 27 is replicated by means of a replication tool under the action of heat and pressure or by UV replication.
  • the optical separation layer 25 consists of a material whose refractive index differs significantly from the refractive index of the replication lacquer layer 24.
  • the adhesive layer 26 it is also possible not to perform the microlens array 15 in such an encapsulated structure, and thus to dispense with the optical separation layer 25. Furthermore, it is also possible for the adhesive layer 26 to be omitted in the area of the relief structure 27 so that the relief structure 27 comes into direct contact with the air.
  • the structure 27 is a relief structure that implements the microlens array 15 by means of a plurality of adjacent macroscopic lenses in the form indicated in FIG. 3c.
  • the relief structure 27 it is also possible for the relief structure 27 to be a diffractive relief structure which produces the effect of a diffractive optical microlens field consisting of convex or concave microlenses.
  • the effect of a convex or concave lens can be generated by a diffractive relief structure which continuously changes with respect to its grating frequencies and possibly further grating constants over a surface area.
  • the effect of a convex lens can be generated by diffractive optics, starting from a paraboloidal central portion in the center of the lens a plurality of annularly arranged to this central portion furrows is provided, the grid frequency increases continuously, starting from the central portion.
  • the effect of a concave lens can be made diffractive by an inverse structure.
  • a plurality of such relief structures are arranged chequerboard side by side. Further, it is also possible that these relief structure are arranged hexagonal side by side.
  • the construction shown in FIG. 4 and the arrangement of the optical element 20 has the advantage that the surface structure which generates the microlens field is largely protected against damage or manipulation.
  • FIG. 5 shows a schematic representation of a viewing situation of a security document 3, in which two microlens arrays 31 and 32 arranged in transparent windows of the security document 3 are kept in register for checking the security document 3.
  • the microlens array 31 has a region 33 with microlenses arranged according to a periodic grid with a positive focal length. Further, the optical element implementing the microlens array 31 is configured in the region 33 such that the microlens array has a distance di from the underside of the security document 3.
  • the microlens array 32 has a region 34 in which a plurality of microlenses with a positive focal length are arranged according to a first grid and further has a region 35 surrounding this region in which a plurality of negative focal length microlenses are arranged according to a second periodic raster. Due to the design of the optical element implemented by the microlens field 32, the microlenses of the region 34 are here spaced from the underside of the security document 3 by a distance d ⁇ .
  • the optical element in which the microlens arrays 31 and 32 are implemented consists of a thermoplastic film body, for example a PET or BOPP film having a layer thickness of 10 to 50 ⁇ m, into which the micro lens arrays 31 and 32 generate Surface structures as shown in Fig. 5 are introduced by means of a replication tool by heat and pressure. Under certain circumstances, this film body is then coated with further layers, for example with an optical separating layer or a protective lacquer layer, and then applied to the support of the security document 3 in the region of the transparent optical window.
  • the optical elements according to FIG. 5 to be constructed like the optical elements 20 according to FIG. 4.
  • the first optical imaging function here has the properties (Kepler telescope) discussed above, depending on the focal lengths of the microlenses of the region 33 and 34 and the spacing of the microlenses of the regions 33 and 34, whereas the second optical imaging function of FIG the focal lengths of the microlenses of the areas 33 and 35 and the spacing of the microlenses in the areas 33 and 35 is determined, of which has very different properties (Gallileo telescope).
  • the distances di and d 2 are in this case preferably selected such that, when the lower sides of the security document 3 lie directly on one another, the sum of the spacings di and d ⁇ corresponds to the sum of the focal lengths of the microlenses in the region 33 and 34, and the distance di the sum of the focal lengths of the microlenses in the areas 33 and 35 corresponds.
  • mapping function generated by the overlapping microlens arrays 31 and 32 is still determined by the spacing of the transparent window covering it, this change in the optical imaging function by altering the spacing of the optical windows from each other as an additional distinctive optical security feature ,
  • the area 34 preferably forms a pattern area formed in the form of a pattern, for example a graphic representation or a lettering, so that areas with different imaging functions receive additional coded information.
  • a juxtaposition of patterned areas with different imaging functions is not imitable by a conventional lens system, so memorable by the invention and with others
  • the microlens field 31 has two regions in which the spacing and / or the focal length of the microlenses differs. It is also possible for the microlens array 31 to be designed in this way. In this case, the region-wise resulting optical imaging functions also depend on the lateral position of the microlens fields 31 and 32 relative to one another, so that the optical imaging function is dependent on lateral displacement of the microlens fields. Fields 31 and 32 changed to each other and thus the viewer different, coded in the mapping function information is made visible depending on the lateral position.
  • FIG. 6 shows a viewing situation of a security document 4, in which two microlens arrays 41 and 42 arranged in transparent optical windows of the security document 4 are kept in coincidence for verification of the security document.
  • the microlens field 41 has in a region 46 a multiplicity of microlenses of constant focal length aligned on a periodic grid.
  • the microlens array 42 has areas 48 and 47 in which the focal length of the microlenses and the lens spacing of the microlenses differ.
  • the security document 4 also has further optical elements 45 and 44, which, as shown in FIG. 6, are applied to the carrier of the security document 4.
  • the optical element 45 is preferably an imprint in the form of a moiré pattern.
  • the moiré pattern is matched to the microlens field 41 in such a way that the region 46 of the microlens field 41 can function as a moiré analyzer and, thus, when the optical element 45 overlaps the microlens field 41, a moire is formed in the moire field.
  • Pattern of the optical element 45 coded Moire image shows.
  • the microlenses of the microlens array 41 form a moire magnifier and moire-magnify a coded (repititive small) information, thereby making hidden (e.g., phase-coded) information visible.
  • optical element 45 is an imprint in the form of a moire analyzer and the microlens array 41 forms a moiré pattern into which a hidden (e.g., phase encoded) moiré image is encoded.
  • a moiré pattern is to be understood here as meaning a pattern formed from repetitive structures, which when superimposed with or in consideration another pattern formed by repetitive structures acting as a moiré analyzer shows a new pattern, namely a moiré image hidden in the moiré pattern.
  • this moiré effect results from the superimposition of two line grids, wherein the one line grating is phase-shifted in regions to produce the moire image.
  • the lines of the line grid have curved areas, for example, are arranged wave-like or circular.
  • the decoding of the moiré image in such a line raster is likewise effected by a region-wise phase shift of the line raster, whereby two or more different moiré images can be encoded in such a moiré pattern.
  • moiré patterns and moiré analyzers are possible (round, oval, square holes of various design) on the so-called. "Scrambled Indica ® 'technology or on a hole pattern based.
  • the optical element 44 is a reflective optical element, such as a partial metallization in the form of a moiré pattern, or a partially metallized diffractive structure.
  • the optical element 44 can also have a field of reflective microlenses, which, when covered by the microlens field arranged in the region 46, show interesting optical effects in reflection.
  • FIGS. 7a to 7c show various viewing situations of a security document 5.
  • the security document 5 is folded, so that transparent windows overlap with microlens arrays 51 and 52 of the security document 5.
  • Fig. 7b the security document 5 is now folded in the other direction such that, in the viewing situation of Fig. 7c, the bottoms of the microlens arrays 51 and 52 do not face each other, as shown in Fig. 7a lie, but now the tops of the microlens fields 51 and 52 lie on each other.
  • the microlens fields 51 and 52 each have a lens body of a thickness di or d 2 and are structured on both sides, so that the optical function of the microlens field 51 results from the interaction of two overlapping partial microlens fields 53 and 54 according to the relationships explained with reference to FIGS. 3 a to 3c. Accordingly, the microlens array 52 is formed by two juxtaposed partial microlens arrays 55 and 56. As further indicated in FIGS. 7a to 7c, the lens body of the microlens fields 51 and 52 is encapsulated and thus coated on both sides with an optical separating layer or a protective layer.
  • the partial microlens fields 54 and 55 hereby have an inverse geometry, as indicated in FIG. 7 a, so that the optical imaging functions generated by the partial microlens fields 54 and 55 cancel out.
  • an optical imaging function is accordingly generated as an optical effect, which results from the superimposition of the partial microlens fields 53 and 56, ie from the lens spacing and the focal length of these microlens fields , This is not the case in the viewing situation according to FIG. 7 c, so that in this viewing situation, an effect similar to a conventional lens is not generated.

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  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Finance (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Credit Cards Or The Like (AREA)
  • Lenses (AREA)
  • Burglar Alarm Systems (AREA)

Abstract

L'invention concerne un document de sécurité (1) comportant une première fenêtre transparente (12), dans laquelle est disposé un premier élément optique (15) et une seconde fenêtre transparente (13), dans laquelle est disposé un second élément optique. La première fenêtre transparente (12) et la seconde fenêtre transparente (13) sont disposées à distance l'une de l'autre sur le support (11) du document de sécurité (1), de sorte que le premier et le second élément optique (15, 16) puissent être placés en recouvrement mutuel. Le premier élément optique (15) présente un premier champ transmissif de microlentilles et le second élément optique (16) présente un second champ transmissif de microlentilles. En cas de recouvrement du second élément optique par le premier champ de microlentilles, il se produit un premier effet optique.
EP05783032.5A 2004-09-15 2005-09-07 Document de securite a fenetres transparentes Not-in-force EP1797539B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004044459A DE102004044459B4 (de) 2004-09-15 2004-09-15 Sicherheitsdokument mit transparenten Fenstern
PCT/EP2005/009584 WO2006029745A1 (fr) 2004-09-15 2005-09-07 Document de securite a fenetres transparentes

Publications (2)

Publication Number Publication Date
EP1797539A1 true EP1797539A1 (fr) 2007-06-20
EP1797539B1 EP1797539B1 (fr) 2015-07-29

Family

ID=35432558

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05783032.5A Not-in-force EP1797539B1 (fr) 2004-09-15 2005-09-07 Document de securite a fenetres transparentes

Country Status (10)

Country Link
US (1) US7931305B2 (fr)
EP (1) EP1797539B1 (fr)
JP (1) JP4939419B2 (fr)
CN (1) CN101019154B (fr)
CA (1) CA2580288C (fr)
DE (1) DE102004044459B4 (fr)
ES (1) ES2551689T3 (fr)
RU (1) RU2376642C2 (fr)
TW (1) TWI383340B (fr)
WO (1) WO2006029745A1 (fr)

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Also Published As

Publication number Publication date
JP2008513817A (ja) 2008-05-01
DE102004044459A1 (de) 2006-03-30
TWI383340B (zh) 2013-01-21
US7931305B2 (en) 2011-04-26
RU2007114066A (ru) 2008-10-27
TW200614099A (en) 2006-05-01
RU2376642C2 (ru) 2009-12-20
CA2580288A1 (fr) 2006-03-23
CN101019154A (zh) 2007-08-15
DE102004044459B4 (de) 2009-07-09
CN101019154B (zh) 2010-07-28
CA2580288C (fr) 2013-01-15
WO2006029745A1 (fr) 2006-03-23
US20080106091A1 (en) 2008-05-08
JP4939419B2 (ja) 2012-05-23
ES2551689T3 (es) 2015-11-23
EP1797539B1 (fr) 2015-07-29

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