WO2005002874A1 - 対象物の識別構造およびその構造が設けられた対象物 - Google Patents
対象物の識別構造およびその構造が設けられた対象物 Download PDFInfo
- Publication number
- WO2005002874A1 WO2005002874A1 PCT/JP2004/009512 JP2004009512W WO2005002874A1 WO 2005002874 A1 WO2005002874 A1 WO 2005002874A1 JP 2004009512 W JP2004009512 W JP 2004009512W WO 2005002874 A1 WO2005002874 A1 WO 2005002874A1
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- WO
- WIPO (PCT)
- Prior art keywords
- liquid crystal
- cholesteric liquid
- identification structure
- security medium
- film
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/30—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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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/30—Identification or security features, e.g. for preventing forgery
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/08—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code using markings of different kinds or more than one marking of the same kind in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means
- G06K19/10—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code using markings of different kinds or more than one marking of the same kind in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means at least one kind of marking being used for authentication, e.g. of credit or identity cards
- G06K19/16—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code using markings of different kinds or more than one marking of the same kind in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means at least one kind of marking being used for authentication, e.g. of credit or identity cards the marking being a hologram or diffraction grating
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- B42D2033/26—
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- B42D2035/24—
Definitions
- the present invention relates to an identification structure for the purpose of preventing counterfeiting of flat objects or various three-dimensional objects such as passports, cards, certificates, gift certificates, paintings, tickets, public voting tickets, etc.
- the present invention relates to a structure for visually or mechanically recognizing a security medium provided in the company, thereby identifying its authenticity.
- a hologram is generally attached to the surface of an object, and the hologram is visually identified to determine its authenticity. Further, there has been proposed a hologram having a specific diffraction characteristic in order to eliminate ambiguity due to visual observation, irradiating the hologram with light of a predetermined wavelength, and determining the authenticity based on a light receiving position of the diffracted light. .
- Patent Document 3 Japanese Patent Application Laid-Open No. H11-151
- Patent Document 4 Japanese Patent Application Laid-Open No. 11-277957
- the spread of hologram manufacturing technology in recent years has facilitated the production of holograms, and visual holograms have been distinguished from genuine ones. Unreproducible reproductions (counterfeit) have become relatively easy to manufacture. Therefore, the hologram It cannot be denied that the anti-counterfeiting effect has been reduced. In addition, other anti-counterfeiting technologies remain to be expensive.
- cholesteric liquid crystal films are suitable for products distributed in general because of their handling properties.
- demands for further anti-counterfeiting effects are increasing.
- the present invention has been devised to solve the above-described problems of the prior art, and is an object identification structure suitable for generally distributed articles, which is extremely difficult to forge and has high discrimination. It is also an object of the present invention to provide an object provided with the structure at low cost.
- a hologram has its optical characteristics determined by the spacing between grooves on a flat surface, so it is relatively easy to copy the hologram if it has the processing technology of the grooves, but the cholesteric liquid crystal film of the present invention is relatively easy to copy.
- its optical properties are determined by the three-dimensional molecular spacing, its production requires high know-how in materials, processing technology, etc., and it has very specific optical parameters. is there. Accordingly, the present inventors have focused on the above characteristics of the cholesteric liquid crystal film, and have utilized such characteristics to identify cards, passports, securities, gift certificates, and the like for preventing forgery.
- a first aspect of the present invention is an object identification structure for identifying the authenticity of the object by optically recognizing the security medium provided on the object, wherein the security medium includes:
- the present invention relates to an object identification structure characterized by using a single-layer cholesteric liquid crystal film that looks substantially colorless and transparent when viewed from the front and looks colored when viewed from a predetermined oblique direction.
- the second aspect of the present invention is to optically recognize a security medium provided on an object.
- the object identification structure for identifying the authenticity of the object, wherein the security medium looks substantially colorless and transparent when observed from the front, and obliquely from the front.
- a single-layer cholesteric liquid crystal film that can be observed by changing the color in the short wavelength direction, such as colorless, red, orange, yellow, green, blue, and purple, when the observation angle is moved.
- a third aspect of the present invention is the object identification structure as described above, wherein the reflected light or the transmitted light from the security medium is recognized or detected through a wavelength plate and a polarizing filter or through a color filter. About.
- a fourth aspect of the present invention relates to the object identification structure described above, wherein the cholesteric liquid crystal film is used as the filter.
- a fifth aspect of the present invention is that the security medium includes a plurality of regions in which a plurality of types of cholesteric liquid crystal films having mutually different characteristics are arranged according to a predetermined rule, and the arrangement pattern is recognized.
- the present invention relates to the above-described object identification structure, wherein the authenticity of the object is identified.
- an area composed of cholesteric liquid crystal and a pseudo area are arranged in accordance with a predetermined rule, and the authenticity of the object is recognized by recognizing the arrangement pattern.
- the present invention relates to the object identification structure described above, wherein the object is identified.
- a seventh aspect of the present invention relates to an object provided with the identification structure described above. '
- an eighth aspect of the present invention relates to a security system using the above-described identification structure.
- the present invention will be described in detail.
- cholesteric liquid crystals have a layered structure, and the molecular major axis directions in each layer are parallel to each other and parallel to the layer plane.
- each layer is rotated little by little and overlaps, forming a three-dimensional spiral structure.
- ⁇ ⁇ ⁇ ⁇ from the distance until this direction factor rotates 360 ° and returns to its original state, that is, the pitch p and the average refractive index n in each layer.
- cholesteric liquid crystal that reflects IR is placed on a material such as black paper that absorbs visible light, and if random light such as sunlight is applied, all transmitted light is absorbed and the wavelength ⁇ Since only the left circularly polarized light of R is reflected, the cholesteric liquid crystal looks bright red.
- the cholesteric liquid crystal has a characteristic that the color changes depending on the viewing angle. This is because, assuming that the incident angle with respect to the liquid crystal surface is e, the optical path difference reflected between the surface and the bottom surface of the liquid crystal, that is, the pitch p is 2 pcos. When this optical path difference becomes equal to an integer multiple of the wavelength; L (2 p * cos 0 2 (a is an integer)), the reflected light of both overlaps and strengthens. Therefore, as the incident angle becomes shallower, the constructive wavelength becomes shorter, that is, changes from red to blue.
- low-molecular liquid crystals are generally sensitive to temperature, electric field, and magnetism, and exhibit color changes due to their effects.However, in order to not disturb the cholesteric alignment after alignment, the liquid crystal is fixed by, for example, heat and Z or photocrosslinking. Alternatively, a cholesteric liquid crystal film glass-fixed using a temperature difference is very stable against these, and is hardly affected by such a phenomenon.
- the cholesteric liquid crystal film used in the present invention looks substantially colorless and transparent when viewed from the front, looks colored when viewed from a predetermined oblique direction, and more specifically, is viewed from the front. In this case, it looks almost colorless and transparent, and when the observation angle is moved from the front diagonally, colors in the short wavelength direction like colorless, red, orange, yellow, green, blue, and purple It is a film that can be observed to change.
- the cholesteric liquid crystal film as described above differs depending on the type and composition ratio of the liquid crystalline polymer material and the liquid crystalline low molecular material used as the film material, and cannot be said unconditionally. Can be obtained by performing a fixing treatment according to the liquid crystal.
- the heat treatment temperature for forming cholesteric orientation is usually 30 to 250 ° C, It is preferably in the range of 40 to 240 ° C, particularly preferably in the range of 50 to 230 ° C.
- the heat treatment time is usually in the range of 5 seconds to 2 hours, preferably 10 seconds to 1 hour, particularly preferably 20 seconds to 30 minutes.
- the film thickness of the cholesteric liquid crystal film is usually in the range of 0.3 to 30 ⁇ , preferably 0.5 to 20 m, and particularly preferably 0.7 to: L 0 ⁇ m.
- a method of fixing the cholesteric orientation when a polymer component is mainly used as a film material, for example, after a desired cholesteric liquid crystal phase is developed, the cholesteric orientation is fixed by rapidly cooling from that state. Can be adopted.
- a low-molecular component is used as a main component, a method of expressing a desired cholesteric liquid crystal phase and fixing the cholesteric alignment by cross-linking with light, heat or an electron beam while maintaining that state is appropriately employed. Can be adopted.
- cholesteric liquid crystal films As a film material for cholesteric liquid crystal films, a predetermined amount of an optically active compound was added to a liquid crystalline polymer compound that exhibited uniform, monodomain nematic alignment on an alignment substrate and that could easily fix the alignment state.
- a cholesteric liquid crystalline high molecular weight substance or a cholesteric liquid crystal high molecular weight substance which exhibits uniform and monodomain cholesteric alignment and can easily fix the alignment state.
- nematic liquid crystal polymer examples include, for example, main chain type liquid crystal polymer such as polyester, polyimide, polyamide, polycarbonate, and polyesterimide, and side chains such as polyacrylate, polymethacrylate, polymalonate, and polysiloxane.
- main chain type liquid crystal polymer such as polyester, polyimide, polyamide, polycarbonate, and polyesterimide
- side chains such as polyacrylate, polymethacrylate, polymalonate, and polysiloxane.
- Type liquid crystalline polymer compound are desirable.
- the constituent units of the polymer include aromatic or aliphatic diol units, aromatic or aliphatic dicarboxylic acid units, and aromatic or aliphatic hydroxycarboxylic acid units.
- an optically active low molecular compound or a low molecular composition can be exemplified.
- Any compound having an optically active group can be used in the present invention, but from the viewpoint of compatibility with the liquid crystalline polymer compound, an optically active liquid crystalline low molecular compound or a liquid crystalline low molecular composition is used. Desirably.
- examples of the optically active component include an optically active polymer compound or a polymer composition. Any compound may be used as long as it has an optically active group in the molecule.However, from the viewpoint of compatibility with the above-mentioned liquid crystalline polymer compound, an optically active liquid crystalline polymer compound or liquid crystalline polymer is used. Desirably, it is a composition.
- the liquid crystalline polymer compound include, for example, polyatalylate, polymethallate, polymalonate, polysiloxane, polyester, polyamide, polyesteramide, polycarbonate, polypeptide, cellulose, or a composition containing these liquid crystalline high molecular compounds as main components. Things and the like. Among them, an optically active liquid crystalline polyester mainly composed of an aromatic compound is mentioned as a preferable example.
- the liquid crystalline high molecular compound having an optically active group in the molecule includes, for example, polyester, polyimide, polyamide, polycarbonate, polyesterimide, or the like having an optically active group in the polymer main chain.
- Examples include polyacrylates, polymethacrylates, polymalonates, and polysiloxanes having an optically active group in the side chain of the molecule.
- a liquid crystalline polyester which has good orientation and is relatively easy to synthesize is desirable.
- the constituent units of the polymer include aromatic or aliphatic diol units, aromatic or aliphatic dicarboxylic acid units, and aromatic or aliphatic hydroxycarboxylic acid units.
- a low molecular component when a low molecular component is a main component as a film material, it is desirable to use a low molecular liquid crystal compound having a crosslinked structure in the molecule.
- Such low-molecular liquid crystalline compounds include, for example, low-molecular liquid crystalline compounds having a functional group such as an acryloyl group, an oxetanyl group, a butyl group or an epoxy group introduced therein, such as a biphenyl derivative, a phenylbenzoate derivative, and a stilbene derivative. Is used as a basic skeleton.
- the liquid crystal either a lyotropic opening property or a thermostatic opening property can be used, but a liquid crystal exhibiting a thermostatic opening property is more preferable from the viewpoint of workability, process, and the like.
- cholesteric liquid crystal film in addition to a liquid crystalline polymer substance or a liquid crystalline low molecular weight substance in the film material, for example, as long as the cholesteric phase is not impaired, Bisazide compounds and daricidylme A crosslinking agent such as tacrylate can be added, and by adding these crosslinking agents, crosslinking can be performed in a state where a cholesteric liquid crystal phase is developed. Further, various additives such as dichroic dyes, dyes, pigments, antioxidants, ultraviolet absorbers and hard coat agents can be appropriately added to the film material as long as the effects of the present invention are not impaired.
- a single-layer cholesteric liquid crystal film is formed on an alignment substrate using the above film materials.
- the substrate include a glass, a plastic film substrate, a plastic sheet, a polarizing film, and the like.
- the glass blue plate glass, alkali glass, non-alkali glass, borosilicate glass, flint glass, quartz glass and the like are used.
- the plastic film substrate use is made of, for example, polymethyl methacrylate, polystyrene, polycarbonate, polyethers / lefon, polyphenylene sulfide, ammonorerez polyolefin, triacetinoresenolerose, polyethylene terephthalate, polyethylene naphthalate, etc. be able to.
- a rubbed polyimide film is preferably used, but other alignment films known in the art can also be used.
- a plastic film / sheet obtained by directly imparting an orientation ability by a rubbing treatment without applying polyimide or the like can also be used as the substrate.
- the method of the alignment treatment is not particularly limited, but any method may be used as long as the cholesteric liquid crystal molecules are uniformly aligned in parallel with the alignment interface.
- a cholesteric liquid crystal film having an appropriate pitch length is formed on the substrate or the alignment film formed on the substrate.
- Means for developing the liquid crystal on the substrate or the alignment film include melt coating and solution coating, but solution coating is preferred in the process.
- the liquid crystal is dissolved in a solvent at a predetermined ratio to prepare a solution having a predetermined concentration.
- the solvent used at this time depends on the type of liquid crystal used, but is usually a halogenated hydrocarbon such as chloroform, dichloroethane, tetrachloroethane, trichloroethylene, tetrachloroethylene, ortho-dichlorobenzene, a mixed solvent of these with phenols, Ketones, ethers, dimethylformamide, dimethylacetamide And dimethylsulfoxide, N-methylpyrrolidone, sulfolane, and cyclohexane.
- a halogenated hydrocarbon such as chloroform, dichloroethane, tetrachloroethane, trichloroethylene, tetrachloroethylene, ortho-dichlorobenzene, a mixed solvent of these with phenols, Ketones, ethers, dimethylformamide, dimethyl
- the concentration of the solution varies depending on the type of liquid crystal used, and is not generally satisfactory. However, it is usually in the range of 5 to 50% by weight, preferably in the range of 7 to 30% by weight.
- This solution is applied onto an alignment film or a substrate that has been subjected to an alignment process such as a rubbing process.
- a spin coating method As a coating method, a spin coating method, a roll coating method, a die coating method, a curtain coating method, or the like can be adopted.
- the solvent is removed by drying, and heat treatment is performed at a predetermined temperature for a predetermined time to complete cholesteric alignment.
- the cholesteric alignment can be fixed by cooling the obtained alignment to a temperature lower than the glass transition point of the liquid crystal, or by irradiating light, heat, an electron beam or the like to crosslink.
- the wavelength band of selective reflection is usually 30 to 500 nm
- the center wavelength of cholesteric selective reflection is usually 700 to 200 nm, preferably 750 to 110 nm. It is desirable that the actual thickness of the liquid crystal layer is usually 0.6 to 6 ⁇ .
- the wavelength bandwidth of selective reflection is the wavelength range where the reflectance due to selective reflection is 70% or more when circularly polarized light in the same direction as the twist direction of the liquid crystal molecules forming cholesteric alignment is incident.
- the center wavelength deviates from the above range, it may be colored even on the front and become invisible, or may not be colored even when viewed obliquely, and it is expected that the effect of the present invention will not be obtained. . If the actual thickness of the liquid crystal layer is less than 0.6 ⁇ , the selective reflection effect due to cholesteric alignment may be reduced. Further, the number of twisted turns of the liquid crystal layer in the cholesteric liquid crystal film layer is usually preferably 2 to 20 turns. If the number is less than 2 turns, the selective reflection effect by the cholesteric orientation may not be sufficiently obtained.
- an overcoat layer for protecting the surface can be formed.
- the overcoat layer is not particularly limited, but, for example, after curing, an adhesive that is optically isotropic, etc. Can be used.
- an adhesive is used for the overcoat layer, the liquid crystal surface of the cholesteric liquid crystal film and the removable substrate are bonded via an adhesive, and after the adhesive is cured, the removable substrate is peeled off to form the overcoat layer. can do.
- the re-peelable substrate is not particularly limited as long as it has re-peelability and has self-supporting properties.
- a plastic film substrate having releasability is used.
- the term “removability” as used herein means that, in a state where the cholesteric liquid crystal film and the removable substrate are adhered via the adhesive, the releasability can be removed at the interface between the adhesive and the removable substrate.
- the adhesive is not particularly limited as long as it can bond the cholesteric liquid crystal film to the removable substrate and can peel the removable substrate.
- the adhesive can be classified into, for example, a photo-curing type, an electron beam-curing type, and a thermosetting type depending on the curing means, and any of them can be suitably used. Above all, a photocurable or electron beam-curable adhesive containing an acryl-based oligomer as a main component, and an epoxy resin-based photocurable or electron beam-curable adhesive are more preferably used.
- the form of adhesion between the cholesteric liquid crystal film and the removable substrate is not particularly limited, but it is general to arrange a layered adhesive layer between the film and the substrate.
- the thickness of the adhesive layer is not particularly limited, it is usually l ⁇ m to 3
- additives such as an antioxidant, an ultraviolet absorber, and a hard coat agent may be added to the adhesive within a range that does not impair the effects of the present invention.
- the alignment substrate After providing the hard coat layer or providing the removable substrate, the alignment substrate is peeled off and removed, and after the adhesive layer is provided on the cholesteric liquid crystal film surface with which the substrate is in contact, a desired transfer element or the like is provided. As a result, semi-finished products of security media can be obtained.
- the method of applying the security medium to the object is not particularly limited, and although it depends on the form of the semi-finished product, it can be easily applied by using, for example, a hot stamping method, a heat sealing method, a roll-type hand-applied seal, or the like. Can be granted.
- the security medium of the present invention When viewed from the front, the security medium of the present invention appears substantially colorless and transparent, and when viewed from a predetermined oblique direction, appears as a colored single-layer cholesteric liquid crystal film, or when viewed from the front. Looks almost colorless and transparent, In addition, use a cholesteric liquid crystal film that can observe color changes in the short wavelength direction such as colorless, red, orange, yellow, green, blue, and purple when the observation angle is moved diagonally from the front. Therefore, it cannot be instantaneously recognized whether or not the security medium is attached to the object. In addition, since the color is observed when obliquely observed, the authenticity can be easily confirmed without using a special detector or the like.
- the authenticity of the security medium can be further confirmed by recognizing or detecting the reflected or transmitted light from the security medium through a polarizing filter consisting of a wave plate and similar cholesteric liquid crystal films and circular polarizers, or through a color filter. it can. Furthermore, even when a security medium is applied so as to cover a photograph or printed matter, when viewed from the front, the design is not impaired because the film is colorless and transparent. Observation from an oblique direction gives a design property that accompanies coloring, which is also excellent in design.
- the security medium provided on the object looks substantially colorless and transparent when observed from the front, and becomes colored when observed from a predetermined oblique direction.
- a single-layer cholesteric liquid crystal film that looks visible or almost colorless and transparent when viewed from the front, and colorless, red, orange, and colorless when the viewing angle is shifted obliquely from the front
- a cholesteric liquid crystal film that can observe color changes in the short wavelength direction, such as yellow, green, blue, and purple
- printing such as photographs and illustrations where the film is applied, and text
- a foil 1 on which a polymer cholesteric liquid crystal having a predetermined pitch is formed is applied to the target object A such as a card, passport, securities, gift certificate, or the like in one or two places by a hot stamping method.
- the hot stamping is a method of transferring a decorative thin film to the surface of an object by instantaneous heat and pressure using an apparatus as shown in FIG.
- the object A is set in the holder 61, and the hot stamping wheel 64 supplied from the supply roll 62 and wound up on the take-up roll 63 is passed through an actuator such as a cylinder (not shown).
- the object A is pressed by the convex mold 66 that is driven and heated by the heating plate 65.
- the hot stamping foil 64 is generally made by laminating a release layer, a protective layer, a metal thin film layer, and an adhesive layer on a base film. When pressed, the pressure and heat give rise to a protective layer from the base film, a cholesteric liquid crystal film.
- the metal thin film layer and the adhesive layer having formed thereon are released from the mold, transferred to the object, and form the foil 1.
- the foil 1 provided on the object A that is, the single-layer cholesteric liquid crystal film is read or recognized visually or mechanically.
- a foil 1 as a security medium composed of a single-layer cholesteric liquid crystal film according to the present invention is transferred or affixed to an object A at an appropriate position.
- the reflection wavelength of the liquid crystal is arranged a filter 2 for cutting, light incident from the direction inclined by theta 2 with respect to the direction perpendicular to the foil 1
- a filter 3 similar to that described above is arranged in the direction of the reflected light in the case of the above.
- the reflected light When random light is incident on the foil 1 at a predetermined angle ⁇ i, for example, assuming that the liquid crystal has a property of reflecting red light, the reflected light does not pass through the filter 2 but becomes dark, and the reflected light is reduced. If light is incident from a direction tilted by 0 2 even though it cannot be recognized, the constructive wavelength will be shorter (closer to blue) and will be transmitted through the filter 3 so that the reflected light can be recognized. This may be visually recognized to determine authenticity, but the authenticity may be determined by arranging a light receiving element or the like at a position corresponding to each of the above directions and detecting the intensity of the reflected light. .
- the position of the reflected light from the foil 1 composed of a cholesteric liquid crystal film as a security medium transferred or affixed to an appropriate position of the object A is set at this position.
- a liquid crystal filter 4 made of a cholesteric liquid crystal film having the same characteristics as the liquid crystal, that is, the characteristics of reflecting only the same circularly polarized light component having the same wavelength as the cholesteric liquid crystal film of the foil 1 is arranged.
- the reflected light When random light is incident on the foil 1, the reflected light does not pass through the filter 4 and becomes dark, and the reflected light cannot be recognized. However, when viewed without passing through the filter 4, the reflected light of a predetermined color can be recognized. The difference may be visually recognized and the authenticity may be determined.However, the light receiving intensity of the reflected light is detected by a light receiving hatch or the like when the filter 4 is interposed or not, and the authenticity is determined from the difference. Sex may be determined.
- a security medium is A foil 21 formed by stacking two types of cholesteric liquid crystal films 21 a and 21 b having different characteristics from each other is transferred or pasted.
- liquid crystal filters 5 and 6 made of a cholesteric liquid crystal film having the same characteristics as those of the liquid crystal films 21 a and 21 b are arranged at positions where the reflected light from the foil 21 reaches.
- the liquid crystal film 21 a and the liquid crystal filter 5 reflect red
- the liquid crystal film 21 b and the liquid crystal filter 6 reflect blue
- the reflection from the foil 21 when random light enters. The light turns purple.
- the transmitted light is blue
- the transmitted light is red. Therefore, the difference may be directly recognized by visual observation and the authenticity may be determined. Alternatively, the authenticity may be determined by detecting and comparing both wavelengths.
- two types of cholesteric liquid crystal films 31a and 31b having different characteristics as a security medium are placed in place or on the entirety of the object A.
- a foil 31 formed to form a design figure, character, or pattern so that it does not overlap is transferred or pasted.
- these liquid crystal films have the same reflection wavelength, the reflected circularly polarized light components are opposite. That is, it is assumed that the liquid crystal film 31a reflects the right-handed circularly polarized light component and the liquid crystal film 31b reflects the left-handed circularly polarized light component.
- a liquid crystal filter 7 made of a cholesteric liquid crystal film having the same characteristics as one of the liquid crystal films 31a and 31b is arranged at a position where the reflected light from the foil 31 reaches (see FIG. 6 ( b)).
- the reflected light from the foil 31 when the random light enters is a color corresponding to the reflection wavelength of the liquid crystal films 31a and 31b, but the distinction between the liquid crystal film 31a and the liquid crystal film 31b is made. That is, it is not possible to recognize design figures, characters, or patterns. Therefore, when the reflected light is viewed through the liquid crystal filter 7, the reflected light from either the liquid crystal film 31a or 31b becomes invisible, and the design figure, character, or pattern can be recognized. This is directly visually recognized to determine authenticity. 2004/009512
- the foil 41 (cholesteric liquid crystal film) as a security medium transferred or affixed to an appropriate position of the object A reflects infrared rays. Therefore, it is visually transparent because it does not reflect visible light.
- the foil 41 is irradiated with the infrared laser from the infrared laser light emitting element 8 at the time of identification.
- the IZ 4 plate 9, the polarizing filter 10 and the light receiving element 11 are arranged in this order.
- an infrared laser is applied to the foil 41, the reflected light is converted into linearly polarized light by the LZ4 plate 9, and the light is received by the light receiving section 11 through the polarizing filter 10 in accordance with the optical axis.
- the authenticity can be determined.
- foils 51a and 51c made of a cholesteric liquid crystal film that reflects infrared rays and transparent PET films 51b, 51d and 51e are predetermined in place of the object A. It is arranged according to the specified rules and constitutes a security medium. At the time of identification, the foil 51a, PET film 51b, foil 51c, PET film 51d, and 51e were scanned in that order, and the reflected light was used as in Example 6 for 4 LZ plates and a polarizing filter.
- the light-receiving intensity of the foils 51a and 51c increases, so for example, the light-receiving intensity above a predetermined value is set to "1", and the others are set to "0". , "1 0 1 00" is obtained. By comparing this with data stored in advance, its authenticity can be determined.
- the number of combinations is 2 n-1 where n is the number of foils or films.
- a foil made of a cholesteric liquid crystal film having different characteristics from the cholesteric liquid crystal films of the foils 51a and 51c may be used, and the binary data may be read from the difference in the characteristics as described above. .
- the security medium transcribed or affixed in place of the object A The center wavelength of the cholesteric liquid crystal finolem as foil 1 is 800 nm.
- the center wavelength of the cholesteric liquid crystal film as the foil 1 as a security medium transferred or affixed to an appropriate position of the object A is 800 nm.
- the reflected light from the cholesteric liquid crystal film is in the near infrared region and not visible, so the reflected light cannot be recognized visually, but when viewed obliquely from about 30 degrees, it is red.
- the color changes sequentially to yellow at an oblique angle of about 40 degrees, and further to green at an oblique angle of about 50 degrees, and the color changes in the short wavelength direction by increasing the viewing angle. confirmed.
- FIG. 1 is a perspective view showing a basic configuration of an object provided with an identification structure according to the present invention.
- FIG. 2 is a perspective view illustrating a configuration according to the first embodiment.
- FIG. 3 is a perspective view showing a configuration in the second embodiment.
- FIG. 4 is a perspective view illustrating a configuration according to the third embodiment.
- FIG. 5 is an enlarged cross-sectional view illustrating a configuration according to the fourth embodiment.
- FIG. 6 is a plan view showing a configuration in the fifth embodiment.
- FIG. 7 is a perspective view showing a configuration in the sixth embodiment.
- FIG. 8 is a perspective view showing a configuration in the seventh embodiment.
- FIG. 9 is a side view showing a schematic configuration of the hot stamping device. (Explanation of code)
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Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04746981A EP1642748A1 (en) | 2003-07-03 | 2004-06-29 | Structure for identifying object and object provided with that structure |
US11/316,080 US20060097514A1 (en) | 2003-07-03 | 2005-12-22 | Object identification structure and object provided with the same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003-191366 | 2003-07-03 | ||
JP2003191366A JP2005022292A (ja) | 2003-07-03 | 2003-07-03 | 対象物の識別構造およびその構造が設けられた対象物 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/316,080 Continuation US20060097514A1 (en) | 2003-07-03 | 2005-12-22 | Object identification structure and object provided with the same |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005002874A1 true WO2005002874A1 (ja) | 2005-01-13 |
Family
ID=33562358
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/009512 WO2005002874A1 (ja) | 2003-07-03 | 2004-06-29 | 対象物の識別構造およびその構造が設けられた対象物 |
Country Status (6)
Country | Link |
---|---|
US (1) | US20060097514A1 (ja) |
EP (1) | EP1642748A1 (ja) |
JP (1) | JP2005022292A (ja) |
KR (1) | KR20060028440A (ja) |
CN (1) | CN1829610A (ja) |
WO (1) | WO2005002874A1 (ja) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003231380A (ja) * | 2002-02-12 | 2003-08-19 | Nhk Spring Co Ltd | 対象物の識別媒体及び識別方法 |
DE102004039355A1 (de) * | 2004-08-12 | 2006-02-23 | Giesecke & Devrient Gmbh | Sicherheitselement und Verfahren zu seiner Herstellung |
DE102006049951A1 (de) * | 2006-10-19 | 2008-04-24 | Giesecke & Devrient Gmbh | Sicherheitselement für Flüssigkristallschichten |
WO2008128714A1 (en) * | 2007-04-24 | 2008-10-30 | Sicpa Holding S.A. | Method of marking a document or item; method and device for identifying the marked document or item; use of circular polarizing particles |
GB2454752B (en) | 2007-11-19 | 2012-05-23 | Rue De Int Ltd | Improvements in security devices |
DE102008037128A1 (de) * | 2008-08-08 | 2010-02-11 | Giesecke & Devrient Gmbh | Sicherheitselement mit Auf- und Durchlicht-Informationen |
JP5451235B2 (ja) * | 2009-07-31 | 2014-03-26 | 富士フイルム株式会社 | 複屈折パターンを有する物品の製造方法及び複屈折パターン作製材料 |
JP2013542408A (ja) * | 2010-09-10 | 2013-11-21 | インテグレイテッド エレクトロニクス マニュファクチュアリング コーポレーション | 符号化アプリケーションのための信号及び検出システム |
WO2018146995A1 (ja) | 2017-02-08 | 2018-08-16 | 富士フイルム株式会社 | 加飾フィルム |
JP7006014B2 (ja) * | 2017-08-23 | 2022-02-10 | 凸版印刷株式会社 | 偽造防止構造体 |
WO2019191841A1 (en) * | 2018-04-05 | 2019-10-10 | National Research Council Of Canada | Multilayer optical thin film structure |
KR102432996B1 (ko) * | 2020-05-13 | 2022-08-17 | 엔비에스티(주) | 콜레스테릭 액정 표시층을 포함하는 위변조 방지수단 |
KR102441227B1 (ko) * | 2020-05-13 | 2022-09-07 | 엔비에스티(주) | 콜레스테릭 액정 표시층을 포함하는 연포장재 |
KR102378182B1 (ko) * | 2020-06-04 | 2022-03-25 | 엔비에스티(주) | 압변색 형광층 및 편광층을 포함하는 위변조 방지수단 |
KR200495231Y1 (ko) * | 2020-06-18 | 2022-04-08 | 엔비에스티(주) | 뷰어 일체형 위변조 방지수단 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6351193A (ja) * | 1986-08-21 | 1988-03-04 | 日石三菱株式会社 | 偽造防止用カ−ド |
JPH1142875A (ja) * | 1997-07-29 | 1999-02-16 | Nhk Spring Co Ltd | 対象物の識別構造及びその構造が設けられた対象物 |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3597043A (en) * | 1969-05-02 | 1971-08-03 | Polacoat Inc | Nematic liquid crystal optical elements |
US3780307A (en) * | 1971-10-22 | 1973-12-18 | Xerox Corp | Liquid crystalline compositions having induced optical activity |
DE2831909A1 (de) * | 1978-07-20 | 1980-02-07 | Basf Ag | Fluessig-kristalline polymerphase mit cholesterischer struktur, verfahren zu ihrer herstellung und ihre verwendung |
US4637896A (en) * | 1982-12-15 | 1987-01-20 | Armstrong World Industries, Inc. | Polymeric liquid crystals |
DE3830592A1 (de) * | 1988-09-08 | 1990-04-12 | Consortium Elektrochem Ind | (meth)acryloxygruppen enthaltende fluessigkristalline polyorganosiloxane |
GB2268906A (en) * | 1992-07-24 | 1994-01-26 | Portals Ltd | Counterfeit protection for documents using optical effects of liquid crystal |
DE4234845A1 (de) * | 1992-10-15 | 1994-04-21 | Consortium Elektrochem Ind | Flüssigkristalline doristerolhaltige Organosiloxane |
DE4344308A1 (de) * | 1993-12-23 | 1995-06-29 | Consortium Elektrochem Ind | Polymerisierbare flüssigkristalline Siloxane |
US5629055A (en) * | 1994-02-14 | 1997-05-13 | Pulp And Paper Research Institute Of Canada | Solidified liquid crystals of cellulose with optically variable properties |
DE4408171A1 (de) * | 1994-03-11 | 1995-09-14 | Basf Ag | Neue polymerisierbare flüssigkristalline Verbindungen |
DE19612973A1 (de) * | 1996-04-01 | 1997-10-02 | Hoechst Ag | LCP-Blends |
DE19619460A1 (de) * | 1996-05-14 | 1997-11-20 | Consortium Elektrochem Ind | Flüssigkristallmischungen, Verfahren zu ihrer Herstellung und ihre Verwendung |
DE19715993A1 (de) * | 1997-04-17 | 1998-10-22 | Clariant Gmbh | Polymerlaminate mit erhöhtem Deckvermögen |
EP2302424B1 (en) * | 1997-05-09 | 2014-12-03 | Rolic AG | Optical element comprising a structured retarder |
DE19737618A1 (de) * | 1997-08-28 | 1999-03-04 | Consortium Elektrochem Ind | Maschinendetektierbare Sicherheitsmarkierung mit erhöhter Fälschungssicherheit, Herstellung der Sicherheitsmarkierung und Sicherheitssystem umfassend diese Sicherheitsmarkierung |
US6643001B1 (en) * | 1998-11-20 | 2003-11-04 | Revco, Inc. | Patterned platelets |
-
2003
- 2003-07-03 JP JP2003191366A patent/JP2005022292A/ja active Pending
-
2004
- 2004-06-29 EP EP04746981A patent/EP1642748A1/en not_active Withdrawn
- 2004-06-29 WO PCT/JP2004/009512 patent/WO2005002874A1/ja active Application Filing
- 2004-06-29 CN CNA2004800216975A patent/CN1829610A/zh active Pending
- 2004-06-29 KR KR1020057025489A patent/KR20060028440A/ko not_active Application Discontinuation
-
2005
- 2005-12-22 US US11/316,080 patent/US20060097514A1/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6351193A (ja) * | 1986-08-21 | 1988-03-04 | 日石三菱株式会社 | 偽造防止用カ−ド |
JPH1142875A (ja) * | 1997-07-29 | 1999-02-16 | Nhk Spring Co Ltd | 対象物の識別構造及びその構造が設けられた対象物 |
Also Published As
Publication number | Publication date |
---|---|
EP1642748A1 (en) | 2006-04-05 |
KR20060028440A (ko) | 2006-03-29 |
CN1829610A (zh) | 2006-09-06 |
US20060097514A1 (en) | 2006-05-11 |
JP2005022292A (ja) | 2005-01-27 |
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