EP1465780B1 - Element de securite a diffraction a guide d'onde optique integre - Google Patents

Element de securite a diffraction a guide d'onde optique integre Download PDF

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Publication number
EP1465780B1
EP1465780B1 EP02806315A EP02806315A EP1465780B1 EP 1465780 B1 EP1465780 B1 EP 1465780B1 EP 02806315 A EP02806315 A EP 02806315A EP 02806315 A EP02806315 A EP 02806315A EP 1465780 B1 EP1465780 B1 EP 1465780B1
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EP
European Patent Office
Prior art keywords
security element
diffractive security
layer
waveguide
diffraction grating
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.)
Expired - Lifetime
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EP02806315A
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German (de)
English (en)
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EP1465780A1 (fr
Inventor
Andreas Schilling
Wayne Robert Tompkin
René Staub
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OVD Kinegram AG
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OVD Kinegram AG
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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
    • B42D25/328—Diffraction gratings; Holograms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/20—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
    • B42D15/00—Printed matter of special format or style not otherwise provided for
    • B42D15/0033—Owner certificates, insurance policies, guarantees
    • 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
    • B42D15/00—Printed matter of special format or style not otherwise provided for
    • B42D15/0053—Forms specially designed for commercial use, e.g. bills, receipts, offer or order sheets, coupons
    • 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
    • B42D15/00—Printed matter of special format or style not otherwise provided for
    • B42D15/0073—Printed matter of special format or style not otherwise provided for characterised by shape or material of the sheets

Definitions

  • the invention relates to a diffractive security element according to the preamble of claim 1.
  • diffractive security elements are used to authenticate items such as banknotes, ID cards of all kinds, valuable documents, in order to determine the authenticity of the item without much effort.
  • the diffractive security element is firmly connected to the object in the output of the article in the form of a cut from a thin layer composite brand.
  • Diffractive security elements of the type mentioned are from the EP 0 105 099 A1 and the EP 0 375 833 A1 known. These security elements comprise a pattern of tessellated surface elements having a diffraction grating. The diffraction gratings are azimuthally arranged in such a way that upon rotation the visible pattern generated by diffracted light performs a predetermined course of motion.
  • the US 4,856,857 describes the construction of transparent security elements with embossed microscopically fine relief structures. These diffractive security elements generally consist of one piece of a thin laminate of plastic.
  • the boundary layer between two of the layers has microscopically fine reliefs of light-diffracting structures. To increase the reflectivity, the boundary layer between the two layers is coated with a mostly metallic reflection layer.
  • the structure of the thin layer composite and the materials used for this purpose are, for example, in US 4,856,857 and the WO 99/47983 described. From the DE 33 08 831 A1 It is known to apply the thin layer composite with the aid of a carrier film on an object.
  • the disadvantage of the known diffractive security elements is the difficulty of visually recognizing complicated, optically changing patterns in a narrow solid angle and the extremely high Surface brightness justified, under which a surface area occupied by a diffraction grating is visible to an observer.
  • the high surface brightness can also make the recognizability of the shape of the surface element more difficult.
  • An easy to recognize security element is from the WO 83/00395 known. It consists of a diffractive subtractive color filter which, when illuminated with, for example, daylight, reflects red light in one viewing direction and, after rotation of the security element, reflects 90 ° light of another color in its plane.
  • the security element consists of plastic-embedded fine fins made of a transparent dielectric with a refractive index that is much larger than the refractive index of the plastic.
  • the lamellae form a lattice structure with a spatial frequency of 2500 lines / mm and reflect red light with very high efficiency in the zeroth order of diffraction when the white light incident on the lamellar structure is polarized such that the E-vector of the incident light is parallel to the light Slats is aligned.
  • the lamellar structure reflects green light in the zeroth diffraction order; for even higher spatial frequencies, the reflected color in the spectrum goes into the blue region.
  • the US 4,426,130 describes transparent, reflective sinusoidal phase grating structures.
  • the phase grating structures are designed such that they have the greatest possible diffraction efficiency in one of the first two diffraction orders.
  • the invention has for its object to provide a cost-effective and easy to recognize, diffractive security element that is easily visually verifiable in daylight.
  • FIG. 1 1 denotes a layer composite, 2 a security element, 3 a substrate, 4 a base layer, 5 an optical waveguide, 6 a protective layer, 7 an adhesive layer, 8 indicia and 9 an optically active structure at the boundary layer between the base layer 4 and the waveguide 5.
  • the composite layer 1 consists of several layers of different, successively applied to a support film not shown here dielectric layers and comprises in the order given at least the base layer 4, the waveguide 5, the protective layer 6 and the adhesive layer 7.
  • the carrier film is part of the base layer 4 and forms a stabilization layer 10 for an impression layer 11 arranged on the surface of the stabilization layer 10 facing the waveguide 5.
  • the connection between the stabilization layer 10 and the impression layer 11 has a very high adhesive strength.
  • a separating layer is arranged between the base layer 4 and the carrier film, since the carrier film serves only for applying the thin layer composite 1 to the substrate 3 and is then removed from the layer composite 1.
  • the stabilization layer 10 is, for example, a scratch-resistant lacquer for protecting the softer impression layer 11.
  • This embodiment of the layer composite 1 is mentioned in the introduction DE 33 08 831 A1 described.
  • the base layer 4, the waveguide 5, the protective layer 6 and the adhesive layer 7 are transparent to at least part of the visible spectrum, but are preferably crystal clear. Therefore, the on the substrate possibly covered with the composite layer 1 Indicia 8 visible through the layer composite 1 through.
  • the protective layer 6 and / or the adhesive layer 7 is colored or black.
  • a further embodiment of the security element has only the protective layer 6, if this embodiment is not intended for sticking.
  • the layer composite 1 is used as e.g. Plastic laminate produced in the form of a long film web with a plurality of juxtaposed copies of the security element 2.
  • the security elements 2 are cut out of the film web and joined to the substrate 3 by means of the adhesive layer 7.
  • the waveguide 5 In order for the waveguide 5 to be optically effective, the waveguide 5 consists of a transparent dielectric whose refractive index is significantly higher than the refractive indices of the plastics for the base layer 4, the protective layer 6 and the adhesive layer 7.
  • Suitable dielectric materials are, for example, in the publications mentioned above WO 99/47983 and US 4,856,857 , Tables 1 and 6 listed.
  • Preferred dielectrics are ZnS, TiO 2 , etc. with refractive indices of n ⁇ 2.3.
  • the waveguide 5 conforms to the interface having the optically active structure 9 for the impression layer 11 and is therefore modulated with the optically active structure 9.
  • a lower limit of about 2200 lines / mm or an upper limit for a period length d of 450 nm is set for the spatial frequency f.
  • diffraction gratings become zeroth diffraction gratings Called "order" and are meant by “diffraction gratings.”
  • the diffraction grating has the FIG. 1 for example, a sinusoidal profile, but other known profiles are usable.
  • the waveguide 5 begins to perform its function, i. to influence the reflected light 14 when the waveguide 5 comprises at least 10 to 20 periods of the optically active structure 9 and therefore has a minimum, dependent on the period length d length L of L> 10d.
  • the lower limit of the length L of the waveguide 5 is in the range of 50 to 100 period lengths d, so that the waveguide 5 exhibits its optimum effectiveness.
  • the security element 2 has on its entire surface a uniform diffraction grating for the optically active structure 9 and a waveguide 5 of uniform layer thickness s.
  • mosaic-shaped surface parts form an optically easily recognizable pattern. In order for a surface part of the mosaic to be visible in its outlines to the naked eye observer, the dimensions should be greater than 0.3 mm, ie. the waveguide 5 has a sufficient minimum length L in each case.
  • the security element 2 illuminated with white diffuse incident light 13 changes the color of the reflected diffracted light 14 when its orientation to the observation direction is changed by means of a tilting or rotary movement.
  • the rotational movement has the surface normal 12 as the axis of rotation, the tilting movement takes place about an axis of rotation lying in the plane of the security element 2.
  • the respective embodiments of the security element 2 have different optical behavior. Such embodiments are described in the following non-exhaustive examples.
  • the waveguide 5 is shown enlarged in cross section.
  • the plastic layers, stabilization layer 10, the impression layer 11, the protective layer 6 and the adhesive layer 7 (FIG. Fig. 1 ) according to US 4,856,857 , Table 6 refractive indices n 1 in the range of 1.5 to 1.6.
  • optically active structure 9 On the introduced into the molding layer 11 optically active structure 9 is the visible light 13 (FIG. Fig.1 ) transparent dielectric with the refractive index n 2 uniformly deposited in the layer thickness s, so that on the interface against the protective layer 6, the surface of the waveguide 5 also has the optically active structure 9.
  • the layer thickness s ⁇ t 75 ⁇ 3 nm.
  • the light beam B pTM incident in the other diffraction plane 15 at the same angle of incidence ⁇ 25 ° leaves the security element 2 as diffracted light 14 in red color, while the diffracted light 14 produced by the light beam B pTE produces an orange mixed color with one in comparison with the reflected light 14 of the light beam B pTM has weak intensity.
  • the color of the security element 2 changes when illuminated with white, unpolarized incident light 13 for an observer from green to red with a rotation of the security element 2 by 90 °.
  • the tilting of the security element 2 in the range of ⁇ 25 ° ⁇ 5 ° changes the color only insignificantly; the change is barely noticeable with the naked eye.
  • This behavior of the security element 2 does not change substantially, except for slight color shifts, when the layer thickness s of the waveguide 5 is varied between 65 nm and 85 nm and the profile depth t between 60 nm and 90 nm.
  • a shortening of the period length d to 260 nm shifts the color of the diffracted light 14 with the incident light beam B nTE from green to red, and in the incident light beam B pTM from red to green.
  • the diffracted light 14 has a red color to which mainly the light beams B pTM contribute.
  • the security element 2 rotates by a few azimuth angle degrees, the reflected color remains red, and as the rotation angle continues to increase, two colors are reflected symmetrically to red, from which the shorter-wavelength color shifts toward the ultraviolet and the longer-wavelength color rapidly disappears in the infrared range.
  • the shorter wavelength color is an orange; the longer-wavelength color is invisible to the observer.
  • the optically active structure 9 consists of at least two intersecting diffraction gratings.
  • the diffraction gratings intersect with advantage at crossing angles in the range of 10 ° to 30 °.
  • Example 5 With asymmetric sawtooth relief profile
  • the optically active structure 9 is a superposition of the diffraction grating zeroth order with the diffraction grating vector 19 (FIG. Figure 5 ) and with an asymmetrical, sawtooth-shaped relief profile 17 of a low spatial frequency of F ⁇ 200 lines / mm.
  • This is advantageous for a consideration of the security element 2, since for many persons the consideration of the security elements 2 described above under the angle of reflection ⁇ (FIG. Fig. 1 ) is very unusual.
  • the highest permissible spatial frequency F depends on the period length d ( Fig. 3 ) of the optically active structure 9.
  • the diffracted light 14 is reflected at a larger angle of reflection ⁇ 1 when illuminating the security element 2 by means of incident light angle 13 to the surface normal 12.
  • the incident light 13 is incident at the angle ⁇ + ⁇ to the vertical 18 on the inclined plane of the waveguide 5 due to the relief profile 17 and is reflected as diffracted light 14 at the same angle to the vertical 18.
  • the FIG. 5 shows the optically active structure 9, which is a superposition of the diffraction grating with an asymmetric, sawtooth-shaped relief profile 17.
  • the azimuthal orientation of the diffraction grating is determined by means of its diffraction grating vector 19.
  • the relief structure 17 has the azimuthal orientation indicated by the relief vector 20.
  • these security elements 2 ( Fig. 3 ) have a high diffraction efficiency of almost 100%, at least for one polarization.
  • the most important parameter of the color shifting capability security element 2 is the period length d ( Fig. 3 ).
  • the layer thickness s ( Fig. 3 ) of the waveguide and the tread depth t ( Fig. 3 ) are not so critical to the ZnS and TiO 2 dielectrics and have little effect on the diffraction efficiency and exact location of the color in the visible spectrum, but do affect the spectral purity of the reflected diffracted light 14 (FIG. Fig. 4 ).
  • the parameter period length d determines the color of the light reflected in the zeroth order reflected light 14.
  • a change in the parameter layer thickness s of the waveguide 5 (FIG. Fig. 4 ) mainly influences the spectral purity of the color of the diffracted light 14 and shifts the position of the color in the spectrum to a small extent.
  • the tread depth t affects the modulation of the waveguide 5 and thus its efficiency. Deviations of ⁇ 5% from the values given in the examples for d, s, t and ⁇ do not appreciably affect the described optical effects for the naked eye. This large tolerance facilitates the fabrication of the security element 2 considerably.
  • Table 1 Parameters (in nanometers) limit area preferred range minimum maximum minimum maximum Period length d 100 500 200 450 Tread depth t 20 1000 50 500 Layer thickness s 5 500 10 100
  • FIGS. 6 and 7 is an embodiment of the security element 2 ( Fig. 3 ), on the surface of which a combination of a plurality of partial surfaces 21, 22 is arranged.
  • the partial surfaces 21, 22 contain waveguides 5 (FIG. Fig. 3 ) and differ in the optically active structure 9 (FIG. Fig. 3 ) and in the azimuthal orientation of the diffraction grating vector 19 (FIG. Fig. 5 ).
  • Technically difficult to realize are in layer composite 1 ( Fig. 1 ) Differences in the layer thickness s of the waveguide 5; but these are not explicitly excluded here.
  • a mark 23 is cut out and adhered to the substrate 3.
  • the mark 23 has two partial surfaces 21, 22.
  • the mark 23 has two partial surfaces 21, 22.
  • the mark 23 has two partial surfaces 21, 22.
  • the mark 23 has two partial surfaces 21, 22.
  • the mark 23 has two partial surfaces 21, 22.
  • the mark 23 has two partial surfaces 21, 22.
  • the mark 23 has two partial surfaces 21, 22.
  • the security element 2 of Example 1 described above is used, the orientation of the diffraction grating vector 19 (FIG. Fig. 5 ) of the first partial surface 21 is orthogonal to the diffraction grating vector 19 of the second partial surface 22.
  • the observation direction is in a plane containing the surface normal 12 whose trace in the plane of the FIGS. 6 and 7 indicated by the dashed line 24.
  • the white, unpolarized incident light 13 ( Fig. 1 ) perpendicular to the grid lines and the second sub-area 22, the incident light 13 parallel to the grid lines at the angle of incidence ⁇ 25 °.
  • the observer therefore sees the first partial surface 21 in a green color and the second partial surface 22 in a red color. Since the layer composite 1 ( Fig. 1 ) is transparent, indicia 8 of the substrate can be seen under the mark 23.
  • the incident light 13 ( Fig. 1 ) on the first face 21 perpendicular to the grid lines of the diffraction grating and on the second face 22 parallel to the grid lines, as indicated by the angle between hatching of the faces 21, 22 and the line 24 in the drawing of FIG. 7 is indicated.
  • the substrate 3 By turning the substrate 3 by 90 ° to swap the Colors of the partial surfaces 21, 22; ie, the first partial surface 21 shines in red and the second partial surface 22 in green.
  • the arrangement of a plurality of equal sub-areas 21 on the mark 23 form a circular ring, wherein the diffraction grating vectors 19 are aligned with the circular center.
  • the farthest (0 ° ⁇ 20 °) and the nearest (180 ° ⁇ 20 °) portions of the annulus glow in a green color and the portions farthest from the diameter when viewed along a diameter of the annulus at 90 ° ⁇ 20 ° or 270 ° ⁇ 20 ° of the annulus in a red color.
  • Intermediate areas have the above-described mixed color of two adjacent spectral regions.
  • the color pattern is invariant with respect to a rotation of the substrate 3 and appears to be relative to any indicia 8 (FIG. Fig. 1 ) to move.
  • a circular ring with curved grid lines produces the same effect when the grid lines are concentric with the center of the annulus.
  • the faces 21, 22 are arranged on a background 25.
  • the partial surfaces 21 and 22 contain the optically active structure 9 (FIG. Fig. 4 ) from example 5, wherein the relief vector 20 (FIG. Fig. 5 ) of a partial surface 21 is opposite to the relief vector 20 of the other partial surface 22.
  • the optically effective structure 9 of the background 25 consists only of the diffraction grating that is not covered by the relief structure 17 (FIG. Fig. 5 ) is modulated.
  • the diffraction grating vector 19 may be aligned parallel or perpendicular to the relief vectors 20; the angle ⁇ ( Fig. 5 ) may well have other values.
  • FIG. Fig. 6 field portions 26 with grating structures with spatial frequencies in the range of 300 lines / mm to 1800 lines / mm and azimuth angles in the range 0 ° to 360 °, which in in the aforementioned EP 0 105 099 A1 and the EP 0 375 833 A1 surface patterns described are used.
  • the field components 26 extend over the security element 2 or over the partial surfaces 21, 22, 25 and form one of the known optically variable patterns, which changes in a predetermined manner during rotation or tilting independently of the optical effects of the waveguide structures under the same observation conditions.
  • the advantage of this combination is that the surface patterns increase the security against forgery of the security element 2.

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  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Finance (AREA)
  • Diffracting Gratings Or Hologram Optical Elements (AREA)
  • Optical Couplings Of Light Guides (AREA)
  • Optical Integrated Circuits (AREA)
  • Credit Cards Or The Like (AREA)
  • Semiconductor Lasers (AREA)

Claims (15)

  1. Élément de sécurité à diffraction (2) à guide d'onde optique (5) formé d'un diélectrique transparent intégré dans un assemblage de couches (1) et encastré entre une couche de base (4) transparente à éclairer et une couche de protection (6), le diélectrique présentant un indice de réfraction considérablement plus élevé que le matériau plastique des couches adjacentes (4 ; 6), et s'adaptant dans des surfaces partielles (21 ; 22 ; 25) à une structure optiquement efficace (9) d'une surface de délimitation par rapport à la couche de base (4),
    caractérisé en ce que
    le diélectrique transparent présente dans le guide d'onde (5) une épaisseur de couche uniforme et une valeur d'indice de réfraction d'au moins 2,
    le guide d'onde est modulé au moyen des structures optiquement efficaces (9), et la structure optiquement efficace (9) en tant que structure de base possède un réseau de diffraction d'ordre nul avec un vecteur de réseau de diffraction (19), une longueur périodique (d) dans la plage allant de 100 à 500 nm et une profondeur de profil (t) dans la plage allant de 20 nm à 1 µm,
    le guide d'onde (5) comporte une longueur minimale (L) d'au moins 10 à 20 longueurs périodiques (d) du réseau de diffraction d'ordre nul,
    et
    dans au moins une des surfaces partielles (21 ; 22 ; 25) la profondeur de profil (t) et l'épaisseur de couche (s) sont situées pour la modulation du guide d'onde (5) dans un des rapports prédéfinis t ≈3s ou s ≈ t ou s ≈ 2t.
  2. Élément de sécurité à diffraction (2) selon la revendication 1, caractérisé en ce que les valeurs de la longueur périodique (d), de la profondeur de profil (t) et de l'épaisseur de couche (s) supportent une tolérance de ± 5 %.
  3. Élément de sécurité à diffraction (2) selon les revendications 1 ou 2, caractérisé en ce que l'épaisseur de couche (s) présente des valeurs dans la plage allant de 65 nm à 85 nm, et la profondeur de profil (t) des valeurs dans la plage allant de 60 nm à 90 nm, et en ce que pour la longueur périodique (d) une valeur dans la plage allant de 260 nm à 370 nm est sélectionnée.
  4. Élément de sécurité à diffraction (2) selon les revendications 1 ou 2, caractérisé en ce que l'épaisseur de couche (s) est sélectionnée avec 115 nm, la profondeur de profil (t) avec 65 nm et la longueur périodique (d) avec 345 nm.
  5. Élément de sécurité à diffraction (2) selon les revendications 1 ou 2, caractérisé en ce que l'épaisseur de couche (s) présente une valeur de 60 nm, la profondeur de profil (t) une valeur de 150 nm et la longueur périodique (d) une valeur de 417 nm.
  6. Élément de sécurité à diffraction (2) selon l'une quelconque des revendications 1 à 5, caractérisé en ce que la structure de base de la structure optiquement efficace (9) est un réseau de diffraction formé de deux réseaux de diffraction se croisant d'ordre nul.
  7. Élément de sécurité à diffraction (2) selon la revendication 6, caractérisé en ce que l'angle d'intersection des réseaux de diffraction d'ordre nul se situe dans la plage allant de 10° à 30°.
  8. Élément de sécurité à diffraction (2) selon l'une quelconque des revendications 1 à 7, caractérisé en ce que la structure optiquement efficace (9) est une superposition de la structure de base avec une structure en relief en dents de scie (17) avec un vecteur de relief (20), en ce que la structure en relief (17) présente une fréquence spatiale (F) inférieure à la valeur inverse de la longueur minimale (L) du guide d'onde (5).
  9. Élément de sécurité à diffraction (2) selon la revendication 8, caractérisé en ce que la structure en relief en dents de scie (17) est asymétrique avec un angle de blaze (γ), et l'angle de blaze (γ) présente une valeur comprise dans la plage allant de 1° à 15°.
  10. Élément de sécurité à diffraction (2) selon la revendication 8 ou 9, caractérisé en ce que le vecteur de réseau de diffraction (19) et le vecteur de relief (20) incluent un angle différentiel azimutal (ψ) comprenant une des valeurs de la suite 0°, 45°, 90°, etc.
  11. Élément de sécurité à diffraction (2) selon l'une quelconque des revendications 1 à 10, caractérisé en ce que ZnS ou TiO2 sert de diélectrique du guide d'onde.
  12. Élément de sécurité à diffraction (2) selon l'une quelconque des revendications 1 à 11, caractérisé en ce que les guides d'ondes (5) des surfaces partielles (21 ; 22) se différencient dans la structure optiquement efficace (9).
  13. Élément de sécurité à diffraction (2) selon l'une quelconque des revendications 1 à 12, caractérisé en ce que les guides d'ondes (5) des surfaces partielles (21 ; 22 ; 25) se différencient dans l'orientation azimutale des vecteurs de réseau de diffraction (19).
  14. Élément de sécurité à diffraction (2) selon les revendications 12 ou 13, caractérisé en ce que le vecteur de réseau de diffraction (19) d'une des surfaces partielles (21) est aligné orthogonalement au vecteur de réseau de diffraction (19) d'une des autres surfaces partielles (22 ; 25).
  15. Élément de sécurité à diffraction (2) selon l'une quelconque des revendications 1 à 14, caractérisé en ce que des fractions de champ (26) comprenant des structures de réseau de fréquences spatiales dans la plage allant de 300 lignes/mm à 1800 lignes/mm et un angle azimutal dans la plage allant de 0° à 360° sont situées dans les surfaces partielles (21 ; 22 ; 25).
EP02806315A 2002-01-18 2002-11-02 Element de securite a diffraction a guide d'onde optique integre Expired - Lifetime EP1465780B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH842002 2002-01-18
CH842002 2002-01-18
PCT/EP2002/012243 WO2003059643A1 (fr) 2002-01-18 2002-11-02 Element de securite a diffraction a guide d'onde optique integre

Publications (2)

Publication Number Publication Date
EP1465780A1 EP1465780A1 (fr) 2004-10-13
EP1465780B1 true EP1465780B1 (fr) 2008-05-21

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EP02806315A Expired - Lifetime EP1465780B1 (fr) 2002-01-18 2002-11-02 Element de securite a diffraction a guide d'onde optique integre

Country Status (12)

Country Link
US (1) US7102823B2 (fr)
EP (1) EP1465780B1 (fr)
JP (1) JP2005514672A (fr)
KR (1) KR20040083078A (fr)
CN (1) CN100519222C (fr)
AT (1) ATE396059T1 (fr)
AU (1) AU2002367080A1 (fr)
DE (1) DE50212303D1 (fr)
PL (1) PL202810B1 (fr)
RU (1) RU2309048C2 (fr)
TW (1) TWI265319B (fr)
WO (1) WO2003059643A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
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DE102014014082A1 (de) * 2014-09-23 2016-03-24 Giesecke & Devrient Gmbh Optisch variables Sicherheitselement mit reflektivem Flächenbereich
DE102014014079A1 (de) * 2014-09-23 2016-03-24 Giesecke & Devrient Gmbh Optisch variables Sicherheitselement mit reflektivem Flächenbereich
DE102015016713A1 (de) * 2015-12-22 2017-06-22 Giesecke & Devrient Gmbh Optisch variables Sicherheitselement mit reflektivem Flächenbereich

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RU2309048C2 (ru) 2007-10-27
PL370298A1 (en) 2005-05-16
DE50212303D1 (de) 2008-07-03
RU2004125166A (ru) 2005-05-10
KR20040083078A (ko) 2004-09-30
EP1465780A1 (fr) 2004-10-13
US20050128590A1 (en) 2005-06-16
PL202810B1 (pl) 2009-07-31
JP2005514672A (ja) 2005-05-19
CN1615224A (zh) 2005-05-11
TW200302358A (en) 2003-08-01
ATE396059T1 (de) 2008-06-15
WO2003059643A1 (fr) 2003-07-24
AU2002367080A1 (en) 2003-07-30
CN100519222C (zh) 2009-07-29
US7102823B2 (en) 2006-09-05

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