EP2084016A1 - Sicherheitselement - Google Patents
SicherheitselementInfo
- Publication number
- EP2084016A1 EP2084016A1 EP07819366A EP07819366A EP2084016A1 EP 2084016 A1 EP2084016 A1 EP 2084016A1 EP 07819366 A EP07819366 A EP 07819366A EP 07819366 A EP07819366 A EP 07819366A EP 2084016 A1 EP2084016 A1 EP 2084016A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- security
- security element
- element according
- recess
- substrate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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
- B42D25/30—Identification or security features, e.g. for preventing forgery
- B42D25/351—Translucent or partly translucent parts, e.g. windows
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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
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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
- B42D25/23—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
- B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
- B42D25/26—Entrance cards; Admission tickets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/30—Identification or security features, e.g. for preventing forgery
- B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
- B42D25/364—Liquid crystals
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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
- B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
- B42D25/378—Special inks
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- B42D2033/06—
-
- B42D2033/12—
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- B42D2033/26—
-
- B42D2035/24—
-
- B42D2035/36—
Definitions
- the invention relates to a security element for product security, for example in the form of a label, seal, packaging or other product security element, but especially for use in security documents, such as banknotes, stocks, certificates, stamps, checks, check cards, credit cards, ID cards, passports, Tickets, tickets, tickets and the like.
- security documents such as banknotes, stocks, certificates, stamps, checks, check cards, credit cards, ID cards, passports, Tickets, tickets, tickets and the like.
- the security element may be integrated with the security document or applied to the security document in the form of a patch or security strip.
- the invention relates to such security elements or security documents which have a see-through window.
- a see-through window is formed by an opening penetrating the substrate material, which is closed by means of a transparent film.
- WO 2006/018171 A2 describes such a security element in connection with a banknote.
- a banknote substrate which usually consists of paper, but can also consist of plastic.
- an information-conveying imprint is applied on the banknote substrate.
- the recess penetrating the substrate is restricted to subregions of the information-conveying imprint. Since the background of the imprint is bright, usually white, the information is difficult to recognize when the bill is viewed against a light background.
- the dark color is also visible in the area of the recesses and thus the information as a whole.
- a subarea of the information adjacent to the recess can also be realized as a dark imprint with a liquid crystal layer printed thereover and the other subarea of the information as a liquid crystal layer on the foil covering the recess.
- both parts then complement each other again to the overall information and show the characteristic of liquid crystals dark colors.
- the above-described security element allows an authenticity check by being viewed first in transmitted light and then against a dark background. It is imitable only with great effort, since various technical challenges have to be overcome, such as manufacturing tolerances of the recesses relative to the information-conveying imprint and register-accurate positioning of the film strip relative to the information-conveying imprint and the like.
- the security element is thus easily verifiable and difficult to imitate.
- Object of the present invention is to further improve the security element in terms of verifiability and imitation security. This object is achieved erf indungspic by a security element with the features of claim 1 and by a security document equipped with such a security element.
- advantageous developments and refinements of the invention are given.
- an inventive method for producing the security element is also specified.
- the combinatorial effect between the imprint and the recess (which can also be a plurality of recesses) which supplement or at least contribute to an information-conveying character or pattern, for example a code, is provided with a further security feature combined, which has an additional decisive influence on the visibility of the information.
- the information-conveying character or pattern is obscured so that it is not, not completely, or at least not readily recognizable.
- the further security feature is characterized in that it imparts a color impression that is variable by an external stimulus so that it is only by means of the stimulus that the simple visual recognizability of the information-conveying character or pattern is made possible or at least facilitated.
- the stimulus in the context of this application are primarily physical stimuli into consideration, such as, for example, temperature, pressure, light, sound, magnetism, electrical Voltage, etc.
- the stimulus "tempera Accordingly, the stimulus "light” physically means the action of electromagnetic radiation of the visible and invisible wavelength range on the security feature.
- chemical stimuli changes the color impression of the security feature.
- the color impression can be effected by the moisture acting on the security element in the form of water or other liquids or by any chemical compounds in the gaseous state of matter.
- a chemical stimulus is thus generally understood to mean the action of liquid, gaseous or solid chemical compounds on the security element.
- the mediated by the security feature color impression is independently reversible, d. h., in the absence of the external stimulus, the security feature changes color until it recovers the color before the stimulus is applied, thus re-creating the original color impression on the viewer.
- the independent reversibility applies to all forms of stimuli, in particular physical and chemical stimuli.
- the external stimulus may be temperature, pressure, electrical voltage, light (electromagnetic radiation), sound and / or magnetism
- the safety feature being thermochromic, piezochromic, electrochromic, photochromic, on sound waves and / or Magnetism color variable reacting material include.
- the color of a deployed security feature may also be altered by different stimuli.
- piezoelectric chrome compounds also have thermochromic properties simultaneously.
- a suitable material is used in a similar manner, ie z. B. a hygrochrome compound.
- the further security feature can be combinatorially combined in a variety of ways with the information-conveying characters or patterns formed by the imprint and the recess.
- the information-conveying characters, including their recesses are covered by a liquid-crystal-coated film, it is possible, for example.
- the liquid crystal coating may be replaced by a thermochromic layer, which is transparent at normal operating temperature, usually ambient temperature, opaque and temperature increase or possibly also in temperature reduction.
- the information-conveying characters or patterns are then recognizable only if at the same time the necessary temperature increase or decrease has taken place in order to make the security feature transparent, and the security element is viewed against a suitable background, in which the imprint overlaps with that through the recesses through visible background to the information-conveying signs or patterns. It is therefore advantageous if the color impression of the security feature changes from opaque to transparent under the influence of the stimulus.
- the known from the prior art liquid crystal coating itself have thermochromic properties by the liquid crystalline material at normal operating temperature in the liquid state and therefore is transparent, and passes at a correspondingly reduced temperature in the liquid crystalline state and that for the respective liquid crystalline material gives characteristic color impression.
- the information-conveying characters or patterns are only completely recognizable with the typical color impression if both the temperature reduction has taken place and a viewing takes place against a suitable background.
- the "obfuscation" of the information-conveying characters or patterns by the security feature in the absence of the stimulus does not necessarily require complete coverage of the characters or patterns by the security feature or it may be just part of the recess and / or contributing part of the message Overprint of the variable security feature to be covered.
- the security feature directly adjoin the information-conveying imprint and z. B. at the usual operating temperature give the same color impression as the imprint itself, for example, black or any other color. Under the influence of the external stimulus, the color impression of the security feature then changes from black to z. B. white or from a first color to a second color such that the information-conveying imprint of contrasting stands out and, if the security element is then viewed against a suitable background, the now no longer veiled imprint with the through the recess Visible background color added to the complete information.
- the part of the imprint which contributes to the information transfer can have a negative edge contour line, that is to say for example a bright contour line in an otherwise dark environment. Then, the information-conveying characters or patterns are difficult to see when viewing the security element against a dark background, as the dark background visible through the recess does not stand out clearly enough from the dark environment of the information-conveying character or pattern. However, in front of a light background, the recess then appearing bright complements the bright edge contour line of the part of the print which contributes to the information transfer to the overall information.
- the recess also has a bright edge contour line
- the complete information is recognizable both before light and against a dark background, in the case of a dark background as a complete dark character or pattern with a completely bright negative edge contour line.
- the imprint is preferably for security documents such as bank notes, typical offset printing or nyloprint. This allows you to print one-colored or multi-colored filigree guilloche patterns.
- the substrate material used is above all paper, in particular cotton vellum paper.
- paper can also be used which contains a proportion x polymeric material in the range of 0 ⁇ x ⁇ 100 wt .-%.
- the substrate material is a plastic film, for. B. a polyester film is.
- the film may also be monoaxially or biaxially stretched. The stretching of the film, inter alia, leads to it receiving polarizing properties that can be used as another security feature.
- polarizing properties such as polarization filters, are known to the person skilled in the art.
- the substrate material is a multilayer composite which has at least one layer of paper or a paper-like material.
- a composite is characterized by an extraordinarily high stability, which is of great advantage for the durability of the security feature and, moreover, increases the security against counterfeiting.
- All materials used as substrate material can have additives which serve as authenticity features. It is primarily to be thought of luminescent, which are preferably transparent in the visible wavelength range and in the non-visible wavelength range by a suitable tool, eg. B. a UV or IR radiation emitting radiation source can be excited to produce a visible or at least detectable with auxiliary luminescence. Others too Security features can be used to advantage if they do not affect the viewing of the imprint or only slightly.
- the film may be formed as a patch covering a partial surface of the substrate or as a strip extending over the entire length or width of the security document.
- materials for the film are primarily plastics, in particular PET (polyethylene terephthalate), PBT (polybutylene terephthalate), PEN (polyethylene naphthalate), PP (Polyproyplen), PA (polyamide), PE (polyethylene), into consideration.
- the film may also be monoaxially or biaxially oriented.
- the recess can be formed both during and after the production of the substrate.
- another security feature is created due to the irregularly protruding into the recess fibers, as described in more detail in WO 03/054297 A2.
- the disclosure of WO 03/054297 A2 is included in the present application.
- the recess after the production of the substrate for. B. by punching or laser beam cutting generated.
- suitable tools such as punching and cutting devices and lasers, basically known.
- the security feature takes place before or preferably after the application of the film to the substrate.
- the security feature advantageously extends beyond the film to the substrate. This complicates the imitation, since the adhesion of the ink on a film on the one hand and a preferably paper-based substrate on the other hand is different and not every color composition is suitable.
- the security feature is at least partially on the film. It is particularly preferred if the security feature is printed by intaglio printing on the film and possibly also on the adjacent substrate. Firstly, tactile structures that are characteristic of intaglio printing can be produced, which on the one hand stem from the pasty inks used which are applied to the printed substrate and project tangibly from the substrate surface.
- the tactile structures are due to the fact that during the printing process the printed substrate is pressed into the ink-filled recesses of the intaglio printing plate used for printing and thereby "embossed.”
- the printing of films requires intaglio printing, in particular to avoid cracks in the film by the action of the engraving plate, considerable craftsmanship and therefore provides additional protection against counterfeiting.
- the contributing to the information transfer part of the imprint can be applied either on both sides of the substrate either congruent or each other in the transmitted light complementary. In both cases you need a simultaneous printing machine to achieve the desired level of coverage. This additionally protects the security element against counterfeiting.
- the film may include further layers.
- the security feature and a transparent or semitransparent effect layer can cover each other at least partially, in order to integrate in this way a supplementary security feature in the security element.
- the effect layer may comprise thin-film pigments with interference effects, such as the so-called IRIODIN® from Merck. But other optically variable security features are conceivable, such as transparent and / or nontransparent holographic elements, diffractive structures, and the like.
- the film may be partially metallized, wherein the metallization is aligned when applying the film to the substrate accurately to the imprint or to a separate background printing. This measure also makes forgery more difficult, since it requires the precise application of such a security strip particularly accurate machines.
- the accuracy of fit of the film relative to the imprint is preferably 0.3 mm to 0.5 mm or less.
- the formation of the recess accurately relative to the imprint is of particular importance, since even small tolerances in conjunction with the contributing to the information sharing part of the imprint attract attention to the viewer. If the recess is punched, with a punch width of preferably at least 2 mm to about 3 mm, the fit accuracy of the recess relative to the imprint should be less than 0.2 mm.
- the security element according to the invention can be used independently, for example as label, seal, packaging or other product securing element. However, it is particularly suitable for covering a through-hole in a security document.
- banknotes but also shares, certificates, stamps, checks, check cards, credit cards, ID cards, passports, entrance tickets, tickets, air tickets and the like come into consideration as security documents.
- the security element can also be integrated in a security document, wherein the substrate of the security element is then formed by the security document material and the recess of the security element is realized as a through hole in the security document.
- FIG. 5 shows a banknote with a security element according to a fourth exemplary embodiment
- FIG. 7 shows a banknote with a security element according to a fifth exemplary embodiment.
- FIG. 1 shows a security document, here for example a banknote, which is equipped with a security element 2. It is understood that the security documents described below, in addition to the security element 2 further security elements or features, not shown, such. Security print, color-changeable coatings, holograms, diffraction structures, transparencies, etc.
- the security element 2 of FIG. 1 is integrated into the banknote insofar as a through-hole 3 in the substrate of the banknote is a component of the security element 2.
- the through hole 3 constitutes a see-through area in the document.
- the security element 2 further comprises a print 4 on the banknote substrate 1, a film 5 completely covering the through-hole 3 and the print 4, and a coating 6 which is a special one Security feature forms by their color impression is reversibly variable by an external stimulus.
- the imprint 4 is printed on the substrate 1 with a contrasting color to the substrate 1, for example with black printing ink.
- a usual in banknote printing printing method such. B. offset printing or Nyloprint serve.
- the through-hole 3 (in this case several) is punched out of the substrate 1 with an exact fit to the imprint 4, so that the corresponding recesses communicate the information "20" together with the imprint 4.
- the transparent film 5 is expediently already coated with the security feature 6 at the time of its application to the substrate 1.
- the Beschichrung can also applied only in a subsequent step, z. B. are printed, and can then extend beyond the film 5 in addition to the substrate 1 in particular.
- the security feature 6 can also be limited to one or more portions of the film 5 beyond. It is also conceivable that the security feature, at least in some areas, has information that individualizes the security element or security document in the form of an alphanumeric character, barcodes, pattern, microprint, etc. However, such information is not shown here for reasons of clarity.
- the security feature 6 has thermochromic, piezochromic, electrochromic, photochromic, hygrochrome, color-responsive properties to sound waves and / or magnetism, namely such that it is opaque or opaque in normal use and obstructs the view of the underlying information "20" , and that it releases the view of the information "20" in the stimulated state.
- the information "20" becomes optimally recognizable only when the banknote is viewed in front of a correspondingly dark background, so that the see-through areas 3 with the imprint 4 complete the overall information "20".
- thermochromic material of the security feature 6 with which the film 5 can be printed or coated a microencapsulated, organic three-component dye system is used.
- the dye system comprises an electron-rich organic dye, the "Color former”, also referred to as “Electron Donor”, a “Color Developer”, also referred to as “Electron Acceptor”, and a suitable solvent.
- These three components are microencapsulated, typically in gelatin.
- As an electron donor so-called leuco dyes are used, in particular spirolactones, fluorans, spiropuranes or fulgides.
- the electron acceptor used is a weak acid, for example bisphenol A (4,4'-methylethylidene bisphenol), alkyl p-hydroxybenzoates, 1,2,3-triazoles or 4-hydroxycoumarin.
- the solvent used is a polar solvent, for example alcohols, ketones, esters or ethers. These three component blends are typically colored or opaque at lower temperatures and colorless at higher temperatures.
- the turnover temperature can be adjusted by modifying the components.
- the turnover temperature of the microencapsulated three-component mixture is in the range of -10 0 C to 60 0 C, more preferably in the range of 25 ° C to 60 0 C. It is ideal if the transition temperature between a conventional ambient temperature of z. B.
- thermochromic mixtures are described in more detail with reference to further literature in White / LeBlanc "Thermochromism in Commercial Products", Journal of Chemical Education, 1999, page 1202.
- the microencapsulated three-component mixture can be contained in ink adapted to the intaglio printing process in order to produce security-relevant gravure printing products.
- intaglio produced print images can be characterized in particular by tactility.
- very fine line structures or Mikroschrif th can be realized, which are not possible in screen printing.
- the ink next to the microencapsulated three-component mixture comprises a suitable binder, possibly further fillers, dryers, varnish and
- the proportion of the microencapsulated three-component mixture in the printing ink is from 10% by weight to 40% by weight, preferably from 25% by weight to 35% by weight, where the weight ratio of the three-component mixture to the binder in the Range from 1 to 6 to 2 to 1.
- Suitable binders are rosin resins and oils.
- the microencapsulated three-component mixture is mixed as a pigment directly or as an aqueous suspension with a suitable binder and optionally additives, such as fillers, solvents, varnish, thinner, dryer, etc.
- the weight ratio of colored pigments to the three-component mixture may be in the range of 1 to 40 to 1 to 1, and the weight ratio of effect pigments to the three-component mixture may be in the range of 1 to 40 to 1 to 2.
- an ink which appears green below the transposition temperature and yellow above the transposition temperature. This may be particularly suitable for an embodiment to be described in more detail below.
- the printing ink of the invention a pasty consistency and Accord- has accordingly high viscosity of preferably 100 Pa-S to 600 Pa * s at 20 0 C and a shear rate of 4 s "1, more preferably from 200 Pa 1 S to 500 Pa-S at 20 0 C and a shear rate of 4 S " 1 .
- the printed image produced in intaglio printing is preferably full-surface or is characterized by very fine lines.
- Suitable printing plates for producing full-surface, produced by intaglio printing process printed images are described in EP 1 117537 Bl and in EP 1 119457 Bl.
- the starting substance is the micro-encapsulated three-component mixture Matsui 25 Fast Black. This is a slurry of 70% by weight of pigment in 30% by weight of water. This is concentrated so that the pigment is present. 23 wt .-% of the dried pigment are ground with 62.5 wt .-% transparent white (binder with filler, No. 9 SL 0700 Fa. SICPA). This mixture was further treated with 2.3 wt .-% a Mn / co-octoate mixture (dryer, No. 870950, Fa. SICPA), with
- 32.5 wt .-% of the microencapsulated three-component mixture Matsui 25 Fast Black are mixed with the following components: 39.2 wt .-% transparent white (binder with filler, No. 9 SL 0700 Fa. SICPA), 2.3 wt. % of a Mn / co-octoate mixture (dryer, No. 870950,
- Fa. SICPA 23.2 wt .-% HT varnish (Varnish, No. 850090, Fa. SICPA), 2.8 wt .-% high-boiling mineral oils (thinner, No. 859041, Fa. SICPA).
- the color-variable security feature that is variable by the external stimulus comprises a microencapsulated, thermochromic, cholesteric, liquid-crystalline substance.
- Cholesteric liquid crystals are offered, for example, by the manufacturers Merck and TMC.
- the molecules are oriented in preferred directions, the preferred directions changing periodically over the layer thickness. The distance of these differently oriented layers changes with the temperature and thus changes their color effect, which changes with the temperature course over red, orange, yellow, green, blue, violet.
- the liquid crystals are microencapsulated in gelatin or other encapsulating media.
- polymer solutions may serve as the material for the security feature.
- a polymer solution breaks down into a polymer-rich and a polymer-poor solution phase if a critical value Xk is exceeded or undershot.
- the value of Xk depends on the degree of polymerization, on the temperature and of course on the system.
- systems can be exemplified the solution of poly (N-acryloyl-pyrrolidine) in water and polystyrene in cyclohexane.
- the value Xk decreases with increasing temperature, ie the polymer solubility increases. From a critical temperature TUCST (English: Upper Critical Solution Temperature), the appearance of the polymer solution changes from cloudy to clear.
- the value X increases with increasing temperature or initially decreases with increasing temperature and then rises again.
- the temperature at which the value X reaches the critical limit Xk for the second time is referred to as the lower critical solution temperature TLCST (English: Lower Critical Solution Temperature).
- TLCST The temperature at which the value X reaches the critical limit Xk for the second time.
- the molecular weight and the mixing ratio, the turnover temperature and the temperature interval can be adjusted.
- these systems z. B. in gelatin they can be mixed inks.
- Printed via a window the window can be switched by changing the temperature either transparent and cloudy. In the same way, information previously applied to the window or to the substrate can be exposed by changing the temperature.
- the physical relationships of thermochromic turbid-clear polymers are described in Lechner / Gehrke / Nordmeier "Makromolekulare Chemie" 2nd ed., Page 183 ff.
- piezo compounds which change their hue on pressure
- metal complexes present in a solvent are known.
- a small increase in the dielectric constant of the solvent by pressurization influences the energy distribution within the metal complexes Due to the pressure, the metal complexes assume a different electronic state (from "high spin” to "low spin” and vice versa) .
- the effect of the spin transition is a reversible electron-dynamical phenomenon that can be observed on numerous coordination compounds of first-transition-metal elements with 4 to 7 electrons in the valence shell (configurations d 4 to d 7 ). This phenomenon is particularly common in iron (II) coordination compounds.
- the spin transition is not only pressure-dependent, but may also be caused by a change in temperature, so that these materials have both thermochromic and piezochromic properties.
- the spin transition simultaneously leads to a drastic change in the magnetic properties of the coordination compounds involved. While the color change can be seen with the naked eye, the spin transition can also be detected by measuring the magnetism. Since the spin transition is completely reversible and the color of the complex compounds is based on the absorption of light by the valence electrodes of their metallic central atom, the substances remain lightfast and colourfast even with long-term use.
- thermochromic properties of the metal complexes can be observed without the metal complexes having to be in solution.
- the piezochromic properties require the presence of a solvent. In this case, a microencapsulation of the metal complex solution z. As required in gelatin.
- piezochromic polymers may be mentioned.
- the color impression of the polymer compound can be changed by pressure.
- liquid crystals rearrange under pressure. This can be observed by the well-known effect that occurs when pressing on an LC display.
- the orientation of the molecules can be designed in such a way that interferences are generated which show a visually perceptible change by pressure.
- Suitable classes of materials are, for example, thermotropic and lyotropic liquid crystal systems.
- electrochromic compounds can also be used as a security feature in connection with the present invention.
- Electrochromic compounds are known in connection with so-called intelligent windows and automatically dimming rear-view mirrors.
- the glass in these cases is coated with electrochromic compounds which are capable of changing color or transparency at an applied voltage.
- the security feature in this case has a multilayer structure, wherein the electrochromic material is arranged adjacent to an electrolyte layer between two electrodes.
- the electrolyte is required for charge mobility.
- electrochromic material is WCb, which is uncharged colorless and oxidized blue.
- inorganic complex compounds and also a variety of organic, conductive polymers are electrochromic, such as polyaniline, polypyrrole, polythiophenes and their derivatives.
- PEDOT from Bayer (Baytron®) is also electrochromic.
- organic materials such as so-called viologens (bipyridium salts) are electrochromic.
- photochromic compounds such as, for example, fulgides, fulgidimides, spiro-dihydroindolizines and many more. Such compounds are for example in the
- EP 0327788 Bl for use in printing inks described.
- the photochromic property is based on a change in the absorption behavior of visible light when the compound is exposed to electromagnetic radiation of predetermined wavelength. For example, systems that change color when irradiated with ultraviolet light are known. The original absorption spectrum will either re-establish itself after a certain time, especially in the dark, or can be restored by heating.
- the material is microencapsulated or microparticles from 1 ⁇ m to Broken 20 microns. It is suitable for most printing processes, including intaglio printing.
- FIG. 3 shows an exemplary embodiment similar to FIG. 1 and FIG. 2, wherein the transparent film 5, however, is provided with the security feature 6 only in partial areas, so that partial areas of the see-through areas 3 remain visible in each case.
- the visible subregions of the see-through areas 3 represent a first easy-to-check security feature.
- the security feature 6 is arranged directly adjacent to the imprint 4 and the recesses 3 which together form the information-conveying symbol "20."
- the color impression of the security feature 6 is in the non-activated state, ie without the external stimulus, identical or nearly identical to the color impression of the imprint 4, for example green, so that a viewer normally only recognizes the see-through windows 3.
- the security feature 6 could, however, additionally cover the see-through windows Security feature 6 is changed, for example, from green to yellow, or in the event that the window areas 3 are covered by the security feature 6 to transparent, so first, the print 4 contrasting contrasting from the security feature 6.
- the full information "20 will then be in front of you again nd colored or dark background clearly visible.
- the security feature 6 can be applied to the film 5 before or after the film 5 is applied to the substrate 1. In the case where it is previously applied, it may be on the final product between the substrate 1 and the film 5 so that it is protected by the film 5, or it may be on the outer side of the film 5. This also applies to the embodiments described above and below. In the latter case it may be expedient to cover the security feature 6 with an outer protective layer (not shown), for example a lacquer layer or a laminated foil. It is also possible to laminate or print on further effect layers (not shown) which contain, for example, interference-layer pigments or other optically variable constituents.
- the security feature 6 is printed on the outside of the film by intaglio printing, so that the feel of the intaglio printing is perceptible as an additional security feature.
- Obfuscation of the information "20” can also be realized by means of a security feature 6, which is transparent in the non-activated state and can be switched to opaque or opaque by means of the external stimulus
- a security feature 6 which is transparent in the non-activated state and can be switched to opaque or opaque by means of the external stimulus
- FIG. 5 shows a cross-section of the banknote from FIG. 5.
- the polychrome security element 6 is provided exactly and exclusively over the see-through areas 3.
- the security feature is transparent, so that the information passing through the see-through windows 3 and the imprint 4 formed total information "20" is recognizable only against a dark background.
- the imprint 4 is printed lightly on a dark background or in a dark environment, the information "20" is completely visible when viewing the banknote against a light background (not shown) obscured information "20" regardless of a particular background by making completely visible that the transparent appearance of the security feature 6 is switched to cloudy or opaque by means of the external stimulus.
- Fig. 7 shows a further embodiment of the invention.
- the film 5 is applied not as a patch but as a film strip extending over the entire banknote width.
- the imprint 4 which contributes to the information "20” with individual components and, moreover, completely encloses the information "20".
- Not printed is a region 4 'immediately adjacent to the information "20.” This region 4' forms This results in a kind of negative contour for the information "20.”
- the information "20" is in turn completed by the see-through regions 3 in the substrate 1.
- the information "20" can be recognized regardless of whether the banknote is viewed against a dark or a light background, but the information "20" becomes even clearer against a dark background because the negative contour 4' becomes stronger as a result contrasted. If the negative contour 4 'is limited only to the part of the imprint 4 contributing to the promotion of information, ie does not extend along the see-through areas 3 (not shown separately), the complete information "20" when viewing the banknote is against a dark background However, it is clearly perceptible against a lighter background since the negative contour 4 'then complements the window areas 3 for information.
- the security element 6 is in turn applied over the information and obfuscates the information in the non-stimulated state.
- the security feature 6 extends partially over the imprint 4, partly over the see-through areas 3, and also extends beyond the foil 5 to the substrate 1.
- the security feature 6 can again advantageously be realized as intaglio printing.
- the substrate 1 furthermore has a background printing 7, which is indicated here by five arcuate lines and is typically realized as an entangled line pattern ("guilloche pattern").
- the imprint 4 and background printing 7 can be produced in the same operation, for example in offset printing or nyloprinting
- the film 5 can have line patterns 8 corresponding to background printing 7. It is then to ensure a register-accurate application of the film 5 on the substrate 1, so that the patterns 7 and 8 complement each other and / or cover each other congruent. This further increases the security against forgery of the document.
- the line patterns 8 of the film 5 are preferably designed as a metallization, which on the one hand, the complexity and thus the security against counterfeiting is increased and on the other hand, a simple visual inspection of the precise application of the film strip 5 is facilitated by the untrained user.
- the patterns 7 and / or 8 can also be realized advantageously in the other embodiments.
- the imprint 4 may be printed on both sides of the substrate 1, either congruent to each other or each other in transmitted light complementary. This represents another security feature which can only be imitated with particular technical effort and which can be realized in technically complex simultaneous printing.
- the security feature 6 can advantageously be covered with a protective layer, in particular by means of a clearcoat layer or a laminated transparent film, in order to protect the color-changeable security feature against environmental influences.
- the protective lacquer layer can be applied over the entire surface or in partial areas. In the paint system z. B. UV coatings, hybrid coatings, oil-based or dispersion coatings of one or two component type can be used.
- the protective lacquer layer is preferably printed, for. B. by flexographic or offset printing.
Landscapes
- Business, Economics & Management (AREA)
- Accounting & Taxation (AREA)
- Finance (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Credit Cards Or The Like (AREA)
- Printing Methods (AREA)
- Structure Of Printed Boards (AREA)
- Input From Keyboards Or The Like (AREA)
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102006051524A DE102006051524A1 (de) | 2006-10-27 | 2006-10-27 | Sicherheitselement |
| PCT/EP2007/009322 WO2008049632A1 (de) | 2006-10-27 | 2007-10-26 | Sicherheitselement |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2084016A1 true EP2084016A1 (de) | 2009-08-05 |
| EP2084016B1 EP2084016B1 (de) | 2011-10-19 |
Family
ID=39244430
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP07819366A Not-in-force EP2084016B1 (de) | 2006-10-27 | 2007-10-26 | Sicherheitselement |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP2084016B1 (de) |
| AT (1) | ATE529269T1 (de) |
| CA (1) | CA2667704A1 (de) |
| DE (1) | DE102006051524A1 (de) |
| WO (1) | WO2008049632A1 (de) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111220665A (zh) * | 2018-11-27 | 2020-06-02 | 恩德莱斯和豪瑟尔分析仪表两合公司 | 电化学传感器 |
Families Citing this family (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009016533A1 (de) * | 2009-04-06 | 2010-10-07 | Giesecke & Devrient Gmbh | Piezochromes Sicherheitselement auf Flüssigkristallbasis |
| GB0906367D0 (en) * | 2009-04-14 | 2009-05-20 | Rue De Int Ltd | Security document |
| GB0906366D0 (en) * | 2009-04-14 | 2009-05-20 | Rue De Int Ltd | Security device |
| EP2553403B1 (de) * | 2010-03-30 | 2019-02-20 | Sun Chemical Corporation | Reversibles piezochromes system und verfahren zur herstellung eines reversiblen piezochromen systems |
| DE102010014866B4 (de) | 2010-04-13 | 2017-01-12 | Bundesdruckerei Gmbh | Verfahren zum Erzeugen mindestens eines Sicherheitsmerkmals in einem flachen Substrat sowie Sicherheits-oder Wertdokument |
| EP2566702B1 (de) * | 2010-05-04 | 2014-11-26 | Giesecke & Devrient GmbH | Datenträger mit polymersubstrat mit motivbereich |
| DE102010054058B4 (de) | 2010-12-10 | 2024-07-25 | Giesecke+Devrient ePayments GmbH | Tragbarer Datenträger, System und Verfahren zum Anzeigen einer Information mittels farbveränderndem Material |
| DE102011010127A1 (de) | 2011-02-02 | 2012-08-02 | Giesecke & Devrient Gmbh | Authentizitätssicherung von Wertdokumenten mittels photochromer Farbstoffe |
| CN105339180B (zh) | 2013-03-15 | 2018-05-11 | 光学物理有限责任公司 | 光学安全性设备 |
| DE102013017537A1 (de) * | 2013-10-22 | 2015-04-23 | Giesecke & Devrient Gmbh | Verfahren zur Herstellung eines laminierbaren Folienpakets |
| KR102385592B1 (ko) | 2014-03-27 | 2022-04-11 | 비쥬얼 피직스 엘엘씨 | 점멸형 광학 효과를 산출하는 광학 소자 |
| US10766292B2 (en) | 2014-03-27 | 2020-09-08 | Crane & Co., Inc. | Optical device that provides flicker-like optical effects |
| US10800203B2 (en) | 2014-07-17 | 2020-10-13 | Visual Physics, Llc | Polymeric sheet material for use in making polymeric security documents such as banknotes |
| AU2018219917A1 (en) * | 2017-02-10 | 2019-07-11 | Crane & Co., Inc. | Authentication and anti-harvesting security feature with machine detectable indicia |
| DE102017001347A1 (de) | 2017-02-10 | 2018-08-16 | Giesecke+Devrient Currency Technology Gmbh | Datenträger mit Fenstersicherheitselement |
| ES2922024T3 (es) | 2017-02-10 | 2022-09-06 | Crane & Co Inc | Dispositivo óptico de seguridad legible por máquina |
| DE102017118579A1 (de) * | 2017-08-15 | 2019-02-21 | Leonhard Kurz Stiftung & Co. Kg | Dokument, Verfahren zur Herstellung eines Dokuments sowie eine Vorrichtung zur Durchführung eines Verfahrens |
| US11120711B2 (en) * | 2017-08-30 | 2021-09-14 | Mimaki Engineering Co., Ltd. | Multilayered printed matter and multilayer printing method |
| US10479128B2 (en) * | 2017-10-27 | 2019-11-19 | Assa Abloy Ab | Security feature |
| DE102021124407A1 (de) * | 2021-09-21 | 2023-03-23 | Leonhard Kurz Stiftung & Co. Kg | Thermochromes Sicherheitselement und Verfahren zur Herstellung eines thermochromen Sicherheitselements |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5282651A (en) * | 1991-04-15 | 1994-02-01 | Frank Alonso | Trading cards and method of concealing and revealing information thereon |
| DE19934434B4 (de) * | 1999-07-22 | 2006-10-05 | Bundesdruckerei Gmbh | Wert- und Sicherheitserzeugnis mit Mikrokanälen |
| FR2855640B1 (fr) * | 2003-05-26 | 2005-09-09 | Arjo Wiggins | Document de securite et son procede de fabrication |
| GB0412981D0 (en) * | 2004-06-10 | 2004-07-14 | Rue De Int Ltd | Improvements in security devices |
| GB0412979D0 (en) * | 2004-06-10 | 2004-07-14 | Rue De Int Ltd | Improvements in security devices |
| DE102004031043A1 (de) * | 2004-06-25 | 2006-01-12 | Giesecke & Devrient Gmbh | Sicherheitselement mit eingebrachten Motiven |
| US20070246933A1 (en) * | 2004-08-12 | 2007-10-25 | Giesecke & Devrient Gmbh | Security Element Comprising a Support |
| JP4539909B2 (ja) * | 2004-10-01 | 2010-09-08 | 日本発條株式会社 | 識別媒体およびその識別方法 |
| GB2437939B (en) * | 2006-05-08 | 2008-03-26 | Rue De Int Ltd | Improvements in security substrates |
| JP4822522B2 (ja) * | 2006-07-19 | 2011-11-24 | トッパン・フォームズ株式会社 | 偽造防止媒体 |
| JP2008162233A (ja) * | 2007-01-04 | 2008-07-17 | National Printing Bureau | 真偽判別印刷物、該印刷物の真偽判別方法及び真偽判別システム |
-
2006
- 2006-10-27 DE DE102006051524A patent/DE102006051524A1/de not_active Withdrawn
-
2007
- 2007-10-26 CA CA002667704A patent/CA2667704A1/en not_active Abandoned
- 2007-10-26 AT AT07819366T patent/ATE529269T1/de active
- 2007-10-26 WO PCT/EP2007/009322 patent/WO2008049632A1/de not_active Ceased
- 2007-10-26 EP EP07819366A patent/EP2084016B1/de not_active Not-in-force
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2008049632A1 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111220665A (zh) * | 2018-11-27 | 2020-06-02 | 恩德莱斯和豪瑟尔分析仪表两合公司 | 电化学传感器 |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2008049632A1 (de) | 2008-05-02 |
| CA2667704A1 (en) | 2008-05-02 |
| ATE529269T1 (de) | 2011-11-15 |
| EP2084016B1 (de) | 2011-10-19 |
| DE102006051524A1 (de) | 2008-04-30 |
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