WO1999053349A1 - Optical identification element - Google Patents
Optical identification elementInfo
- Publication number
- WO1999053349A1 WO1999053349A1 PCT/IB1999/000590 IB9900590W WO9953349A1 WO 1999053349 A1 WO1999053349 A1 WO 1999053349A1 IB 9900590 W IB9900590 W IB 9900590W WO 9953349 A1 WO9953349 A1 WO 9953349A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- layer
- identification element
- reflector
- orientation
- optical identification
- Prior art date
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 27
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims description 6
- 239000000178 monomer Substances 0.000 claims description 6
- 229920000642 polymer Polymers 0.000 claims description 6
- 229920000106 Liquid crystal polymer Polymers 0.000 abstract description 7
- 239000004977 Liquid-crystal polymers (LCPs) Substances 0.000 abstract description 7
- 230000000007 visual effect Effects 0.000 abstract description 2
- 238000004132 cross linking Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 101100457849 Caenorhabditis elegans mon-2 gene Proteins 0.000 description 2
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 2
- RDOXTESZEPMUJZ-UHFFFAOYSA-N anisole Chemical compound COC1=CC=CC=C1 RDOXTESZEPMUJZ-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 2
- 229910052753 mercury Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000004528 spin coating Methods 0.000 description 2
- UHFFVFAKEGKNAQ-UHFFFAOYSA-N 2-benzyl-2-(dimethylamino)-1-(4-morpholin-4-ylphenyl)butan-1-one Chemical compound C=1C=C(N2CCOCC2)C=CC=1C(=O)C(CC)(N(C)C)CC1=CC=CC=C1 UHFFVFAKEGKNAQ-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003098 cholesteric effect Effects 0.000 description 1
- 150000001851 cinnamic acid derivatives Chemical class 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 125000004386 diacrylate group Chemical group 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004313 glare Effects 0.000 description 1
- 239000004922 lacquer Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- UZKWTJUDCOPSNM-UHFFFAOYSA-N methoxybenzene Substances CCCCOC=C UZKWTJUDCOPSNM-UHFFFAOYSA-N 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/30—Identification or security features, e.g. for preventing forgery
- B42D25/328—Diffraction gratings; Holograms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
-
- 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
-
- B42D2033/26—
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
- G03H1/0252—Laminate comprising a hologram layer
- G03H1/0256—Laminate comprising a hologram layer having specific functional layer
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H2250/00—Laminate comprising a hologram layer
- G03H2250/38—Liquid crystal
Definitions
- the invention relates to an optical identification element, especially for counterfeit protection and copy protection, comprising at least one optically anisotropic layer, which has at least two regions having different preferred directions, and a layer that is at least partially reflective.
- Such identification elements are based on a hybrid layer structure which comprises a layer having molecules that are fixed (crosslinked) in the liquid- crystalline state, which layer is optically anisotropic and usually acts as an optical retarder.
- the orientation of the liquid crystal molecules can be preset to be different in different areas, preferably by means of a correspondingly structured orientation layer, such as can be produced, for example, from a linearly photopolymerised polymer network.
- the result is an optically structured, fixed liquid crystal layer having an orientation pattern that has been determined in
- the orientation pattern i.e. the information thus recorded in the liquid crystal layer
- the layers appear in this case to be transparent.
- the orientation pattern becomes visible only when the identification element is placed between two polarisers.
- the optically structured liquid crystal layer is located over a reflective background. This makes it possible for the orientation pattern, i.e. the corresponding information, to be rendered visible using only one polariser which is held above the element.
- the reflective background (referred to hereinafter as the reflector) there have been used hitherto materials such as diffuse or mirroring metal surfaces, reflective lacquers, reflective paper or the like.
- hitherto materials such as diffuse or mirroring metal surfaces, reflective lacquers, reflective paper or the like.
- the mode of operation of the identification elements usually requires the incident light to retain its polarisation state, at least to a certain extent, on reflection at the reflector.
- a disadvantage of the reflectors known hitherto for the said identification elements is that brightness and contrast are lost to a comparatively great extent on reflection.
- a holographic reflector This type of reflector, known per se, reflects (and focuses) the ambient light into a predetermined cone of diffuse light and thus produces a substantial increase in brightness in the region of the cone. At the same time, dazzling reflections (glare) are largely avoided and an excellent brightness distribution is obtained. In addition, the polarisation is almost completely retained. These properties bring about a crucial improvement in the visual appearance of the identification elements, which is important both for the actual identification and its ability to be discerned and for market acceptance.
- optical identification element especially for counterfeit protection and copy protection, comprising at least one optically anisotropic layer , which has at least two regions having different preferred directions, and a layer that is at least partially reflective, characterised in that the at least partially reflective layer is a holographic reflector
- the reflector is preferably based on an achromatic, or white light, hologram, that is to say the predetermined cone of diffuse light produced by the holographic reflector is substantially white.
- the holographic reflector is transflective or partially transparent. This enables, for example, an identification element according to the invention to be mounted over a visible feature, which nevertheless remains visible as a result of the partial transparency of the reflector.
- the optically anisotropic layer is formed with liquid crystal molecules that are substantially fixed in their orientation.
- the layer may be formed with a layer of crosslinked liquid-crystalline monomers, oligomers or polymers.
- An orientation layer may be provided for this liquid crystal molecules, preferably formed from a linearly photopolymerised polymer network.
- the invention extends to an item such as a banknote or identity card with protection against forgery and/or copying, characterised by an optical identification element as set forth above.
- a method of checking such an element for authenticity may comprise passing light through a polariser onto the optical component and viewing the reflected light from this layer through the polariser.
- Fig. 1 an identification element according to the invention
- FIG. 2 a further variant of a layer structure for an identification element according to the invention.
- Fig. 3 a diagram showing various possible combinations of the orientation of the optical axes in the retarder layers of Figure 2.
- Figure 1 shows diagrammatically a cut-away view of a layer structure (2, 3, 4) of an identification element according to the invention which is arranged on an article to be protected against counterfeiting or illegal copying, for example on a banknote.
- the height of the element is shown exaggerated; it is usually only a few tens of micrometres.
- the base or substrate of the layer structure is a paper layer 1 which, in the case of a banknote, will be identical with the banknote paper.
- a reflector 2 Mounted on the reflector is an orientation layer 3 on which in turn a retarder layer 4 is mounted.
- the retarder layer 4 has regions having different optical axes (indicated by rectangular divisions in the Figure) which form an orientation pattern. When the configuration is viewed through a (separate) polarisation filter 5, the pattern becomes visible.
- the reflector 2 is important for the optical action of the identification element when viewed through the polarisation filter, the reflector here being a holographic reflector, more specifically a film carrying a white light hologram, as available in various variants, for example, from the Polaroid company under the name LIFT.
- the orientation layer 3 is a so-called “linearly photopoiymerised” (LPP) orientation layer, sometimes also referred to as “photooriented polymer networks” (PPN), which is differently oriented in different areas.
- LPP linearly photopoiymerised
- PPN photooriented polymer networks
- Suitable materials for this purpose are inter alia cinnamic acid derivatives, as described, for example, in the published specifications EP-A-525 478 and US-5 389 698.
- the orienting and simultaneous crosslinking thereof is effected in known manner by selective irradiation with linearly polarised UV light.
- the preparation can be carried out, for example, as follows: the LPP material used is
- a synthesis procedure is described under Example 1 of International Patent Application WO-96/10049.
- the reflector 2 is coated by spin-coating with a 3 % solution of the LPP material in a solvent, for example N-methylpyrrolidone (NMP), for one minute at 2000 rev/min.
- NMP N-methylpyrrolidone
- the layer is then dried for 30 minutes on a hotplate at 130°C.
- the orienting and crosslinking can then be produced by irradiation with the linearly polarised light of a 200W extra high pressure mercury vapour lamp for approximately 5 minutes at room temperature. If, during that procedure, some regions are irradiated with a certain polarisation direction and other regions with a polarisation direction rotated relative thereto, the pattern obtained will have regions of different orientation.
- diacryl components for example, may be used as crosslinkable liquid crystal monomers for the LCP layer:
- Figure 2 shows a further possible layer structure for an identification element according to the invention.
- the reference numeral 10 indicates a reflector which can be of the same construction as in Figure 1.
- two orientation/retarder layer pairs are arranged one above the other, namely a first orientation layer 11, a first retarder layer 12, a second orientation layer 13 and a second retarder layer 14.
- first orientation layer 11 a first orientation layer 11
- first retarder layer 12 a second orientation layer 13
- a second retarder layer 14 With this configuration it is possible to produce a multicoloured pattern when, in addition to different optical axes in different regions of the same retarder layer, also the orientations of the optical axes of regions lying above one another in the retarder layers 12 and 14 are differently combined.
- the two retarder layers advantageously have non-identical optical retardation.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/647,717 US6496287B1 (en) | 1998-04-09 | 1999-04-04 | Optical identification element |
AU29507/99A AU2950799A (en) | 1998-04-09 | 1999-04-06 | Optical identification element |
DE19983080T DE19983080B4 (en) | 1998-04-09 | 1999-04-06 | Optical identification element |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH84198 | 1998-04-09 | ||
CH841/98 | 1998-07-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999053349A1 true WO1999053349A1 (en) | 1999-10-21 |
Family
ID=4196460
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IB1999/000590 WO1999053349A1 (en) | 1998-04-09 | 1999-04-06 | Optical identification element |
Country Status (4)
Country | Link |
---|---|
US (1) | US6496287B1 (en) |
AU (1) | AU2950799A (en) |
DE (1) | DE19983080B4 (en) |
WO (1) | WO1999053349A1 (en) |
Cited By (13)
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---|---|---|---|---|
EP1028359A1 (en) * | 1998-08-27 | 2000-08-16 | Nippon Mitsubishi Oil Corporation | Genuineness detecting system and method for using genuineness detecting film |
WO2005005727A1 (en) * | 2003-07-14 | 2005-01-20 | Giesecke & Devrient Gmbh | Security element |
US6943930B2 (en) | 2002-09-12 | 2005-09-13 | Eastman Kodak Company | Method and system for fabricating optical film using an exposure source and reflecting surface |
US7089420B1 (en) * | 2000-05-24 | 2006-08-08 | Tracer Detection Technology Corp. | Authentication method and system |
WO2007051529A1 (en) * | 2005-11-03 | 2007-05-10 | Giesecke & Devrient Gmbh | Transparent security element and method for its production |
US7375888B2 (en) | 1998-11-13 | 2008-05-20 | Rolic Ltd | Optical component |
EP2081061A1 (en) * | 2006-11-07 | 2009-07-22 | Nippon Oil Corporation | Latent image forming film, latent image identifying kit and method of latent image identification |
CN101739893A (en) * | 2008-11-07 | 2010-06-16 | 富士胶片株式会社 | Foil for preventing forgery |
EP2543521A1 (en) | 2011-07-07 | 2013-01-09 | European Central Bank | Security document and method for protecting a security document against forgery and for the authentication of the security document |
EP2631687A1 (en) * | 2010-10-20 | 2013-08-28 | JVC Kenwood Corporation | Distributive compensator and projecting liquid-crystal display device |
WO2013178453A1 (en) * | 2012-05-30 | 2013-12-05 | Rolic Ag | Fast generation of elements with individually patterned anisotropy |
CN103748192A (en) * | 2011-08-25 | 2014-04-23 | 罗利克有限公司 | Photoreactive compounds |
US9811671B1 (en) | 2000-05-24 | 2017-11-07 | Copilot Ventures Fund Iii Llc | Authentication method and system |
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EP1120737A1 (en) * | 2000-01-27 | 2001-08-01 | Rolic AG | Optical security device |
US6760084B2 (en) * | 2001-01-18 | 2004-07-06 | Hewlett-Packard Development Company, L.P. | Backlit label with enhanced “off”state appearance |
AU2002304051B2 (en) * | 2001-04-24 | 2007-08-16 | Merck Patent Gmbh | Birefringent Marking |
US7061561B2 (en) * | 2002-01-07 | 2006-06-13 | Moxtek, Inc. | System for creating a patterned polarization compensator |
US6909473B2 (en) * | 2002-01-07 | 2005-06-21 | Eastman Kodak Company | Display apparatus and method |
DE60336184D1 (en) * | 2002-02-06 | 2011-04-14 | Merck Patent Gmbh | Birefringent film and its use |
US7923260B2 (en) | 2002-08-20 | 2011-04-12 | Illumina, Inc. | Method of reading encoded particles |
US7164533B2 (en) | 2003-01-22 | 2007-01-16 | Cyvera Corporation | Hybrid random bead/chip based microarray |
US7901630B2 (en) | 2002-08-20 | 2011-03-08 | Illumina, Inc. | Diffraction grating-based encoded microparticle assay stick |
US7900836B2 (en) | 2002-08-20 | 2011-03-08 | Illumina, Inc. | Optical reader system for substrates having an optically readable code |
US7508608B2 (en) | 2004-11-17 | 2009-03-24 | Illumina, Inc. | Lithographically fabricated holographic optical identification element |
US7872804B2 (en) | 2002-08-20 | 2011-01-18 | Illumina, Inc. | Encoded particle having a grating with variations in the refractive index |
US20100255603A9 (en) | 2002-09-12 | 2010-10-07 | Putnam Martin A | Method and apparatus for aligning microbeads in order to interrogate the same |
US7092160B2 (en) | 2002-09-12 | 2006-08-15 | Illumina, Inc. | Method of manufacturing of diffraction grating-based optical identification element |
GB0401060D0 (en) * | 2004-01-19 | 2004-02-18 | Ezra David | Optical devices |
US7433123B2 (en) | 2004-02-19 | 2008-10-07 | Illumina, Inc. | Optical identification element having non-waveguide photosensitive substrate with diffraction grating therein |
DE102004018702B4 (en) * | 2004-04-17 | 2006-05-24 | Leonhard Kurz Gmbh & Co. Kg | Film with polymer layer |
WO2006020363A2 (en) | 2004-07-21 | 2006-02-23 | Illumina, Inc. | Method and apparatus for drug product tracking using encoded optical identification elements |
WO2006055736A1 (en) | 2004-11-16 | 2006-05-26 | Illumina, Inc. | And methods and apparatus for reading coded microbeads |
US7800823B2 (en) | 2004-12-06 | 2010-09-21 | Moxtek, Inc. | Polarization device to polarize and further control light |
US7570424B2 (en) | 2004-12-06 | 2009-08-04 | Moxtek, Inc. | Multilayer wire-grid polarizer |
US7961393B2 (en) | 2004-12-06 | 2011-06-14 | Moxtek, Inc. | Selectively absorptive wire-grid polarizer |
US7487915B2 (en) * | 2005-09-09 | 2009-02-10 | Graphic Security Systems Corporation | Reflective decoders for use in decoding optically encoded images |
US7830575B2 (en) | 2006-04-10 | 2010-11-09 | Illumina, Inc. | Optical scanner with improved scan time |
US8755113B2 (en) | 2006-08-31 | 2014-06-17 | Moxtek, Inc. | Durable, inorganic, absorptive, ultra-violet, grid polarizer |
US7789515B2 (en) | 2007-05-17 | 2010-09-07 | Moxtek, Inc. | Projection device with a folded optical path and wire-grid polarizer |
US8643822B2 (en) * | 2007-07-03 | 2014-02-04 | Jds Uniphase Corporation | Non-etched flat polarization-selective diffractive optical elements |
JP5380007B2 (en) | 2008-06-16 | 2014-01-08 | 富士フイルム株式会社 | Anti-counterfeit media |
US8248696B2 (en) | 2009-06-25 | 2012-08-21 | Moxtek, Inc. | Nano fractal diffuser |
US8970953B2 (en) * | 2009-11-27 | 2015-03-03 | Nhk Spring Co., Ltd. | Identification medium and identification method therefor |
KR101531439B1 (en) * | 2010-01-28 | 2015-06-24 | 니혼 하츠쵸 가부시키가이샤 | Identification medium and method for identification thereof |
KR101841310B1 (en) | 2010-06-30 | 2018-03-22 | 쓰리엠 이노베이티브 프로퍼티즈 컴파니 | Retarder film combinations with spatially selective birefringence reduction |
JP6251569B2 (en) | 2010-06-30 | 2018-01-10 | スリーエム イノベイティブ プロパティズ カンパニー | Diffuse reflective optical film with spatially selective birefringence reduction |
US8913321B2 (en) | 2010-09-21 | 2014-12-16 | Moxtek, Inc. | Fine pitch grid polarizer |
US8611007B2 (en) | 2010-09-21 | 2013-12-17 | Moxtek, Inc. | Fine pitch wire grid polarizer |
CN102173247B (en) * | 2011-02-18 | 2014-03-26 | 甄健 | Method and device for preparing anti-counterfeiting pattern capable of symmetrically changing with visual angles |
US8873144B2 (en) | 2011-05-17 | 2014-10-28 | Moxtek, Inc. | Wire grid polarizer with multiple functionality sections |
US8913320B2 (en) | 2011-05-17 | 2014-12-16 | Moxtek, Inc. | Wire grid polarizer with bordered sections |
US8922890B2 (en) | 2012-03-21 | 2014-12-30 | Moxtek, Inc. | Polarizer edge rib modification |
WO2014120325A2 (en) * | 2012-11-19 | 2014-08-07 | The Arizona Board Of Regents On Behalf Of The Universiy Of Arizona | Optical elements comprising cholesteric liquid crystal polymers |
US9348076B2 (en) | 2013-10-24 | 2016-05-24 | Moxtek, Inc. | Polarizer with variable inter-wire distance |
CN112285819B (en) * | 2020-11-03 | 2023-05-16 | 上海先让新材料合伙企业(有限合伙) | Polarizing film with different optical retardation regions, optical system and application |
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US5691790A (en) * | 1995-08-04 | 1997-11-25 | Raychem Corporation | Colored liquid crystal display having a reflector which reflects different wavelengths of light for different incident angles |
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-
1999
- 1999-04-04 US US09/647,717 patent/US6496287B1/en not_active Expired - Lifetime
- 1999-04-06 DE DE19983080T patent/DE19983080B4/en not_active Expired - Fee Related
- 1999-04-06 WO PCT/IB1999/000590 patent/WO1999053349A1/en active Application Filing
- 1999-04-06 AU AU29507/99A patent/AU2950799A/en not_active Abandoned
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EP0689084A1 (en) * | 1994-06-24 | 1995-12-27 | F. Hoffmann-La Roche AG | Optical component |
EP0689065A1 (en) * | 1994-06-24 | 1995-12-27 | F. Hoffmann-La Roche AG | Optical component |
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Cited By (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1028359A4 (en) * | 1998-08-27 | 2002-06-19 | Nippon Mitsubishi Oil Corp | Genuineness detecting system and method for using genuineness detecting film |
US6628439B2 (en) * | 1998-08-27 | 2003-09-30 | Nippon Mitsubishi Oil Corporation | Genuineness detecting system and method for using genuineness detecting film |
EP1028359A1 (en) * | 1998-08-27 | 2000-08-16 | Nippon Mitsubishi Oil Corporation | Genuineness detecting system and method for using genuineness detecting film |
US7375888B2 (en) | 1998-11-13 | 2008-05-20 | Rolic Ltd | Optical component |
US7089420B1 (en) * | 2000-05-24 | 2006-08-08 | Tracer Detection Technology Corp. | Authentication method and system |
US9811671B1 (en) | 2000-05-24 | 2017-11-07 | Copilot Ventures Fund Iii Llc | Authentication method and system |
US6943930B2 (en) | 2002-09-12 | 2005-09-13 | Eastman Kodak Company | Method and system for fabricating optical film using an exposure source and reflecting surface |
DE10331798B4 (en) * | 2003-07-14 | 2012-06-21 | Giesecke & Devrient Gmbh | Security element, valuable item, transfer material and manufacturing process |
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JP2007527051A (en) * | 2003-07-14 | 2007-09-20 | ギーゼッケ ウント デフリエント ゲーエムベーハー | Security element |
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Also Published As
Publication number | Publication date |
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AU2950799A (en) | 1999-11-01 |
DE19983080T1 (en) | 2001-05-17 |
DE19983080B4 (en) | 2010-04-15 |
US6496287B1 (en) | 2002-12-17 |
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